JPH0677997U - Defective product discharging device of rotary powder compression molding machine - Google Patents

Abstract

(57) [Summary] [Objective] The object of the present invention is to prevent defective molded products blown off by high-pressure air from mixing with good molded products, and to contribute to high-speed operation of rotary powder compression molding machines. To obtain a defective product discharging device of a compression molding machine. [Structure] A molded product E extruded onto a die mounting portion 1a of a rotary disc 1 by a lower punch 6 having a concave punch shape is located in front of a non-defective product passing portion 15 of a discharge conductor 7 and on a rotation locus of a die 2. In the defective product discharging device of the rotary powder compression molding machine, in which the air jetted from the air nozzle 20 provided inside B is blown into the defective product discharge passage 13 of the discharge conductor 7, A defective product discharge passage 13 formed in front of the portion 15
Defective separation chamber 21 and air nozzle 20 facing the entrance 13a of
This is characterized in that the air injection region for the defective product separation chamber 21 is made substantially coincident with the air injection from the air nozzle 20 over substantially the entire defective product separation chamber 21.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a defective product discharge device for a rotary powder compression molding machine, which discharges a molded product determined to be defective to the outside of a rotary disk by air pressure.

[0002]

[Prior art]

 According to Jpn. Pat. Appln. KOKAI Publication No. 3-24313, in a device that blows out defective products by air pressure and discharges them, a molded product contact portion that slightly protrudes within the movement trajectory of the molded product is seen from the moving direction of the molded product before the air nozzle. There is known a technique in which the molded article is provided on the side and is peeled off from the lower punch immediately before the molded article is blown off.

This technique is particularly effective for a molded product having high adhesion to the lower punch, but since all the molded products to be manufactured come into contact with the molded product contact portion, the rotary powder compression molding machine If the rotational speed of the turntable is greatly increased, the impact of the molded product when it hits the contact part of the molded product becomes too large. Therefore, all molded products are easily flipped off at the molded product contact portion, and good products are also taken out from the defective product discharge passage, making it difficult to separate good products and defective products separately. Therefore, for those that rotate the turntable at high speed, it is suitable to separate the defective molded product from the lower punch and blow it off in a predetermined direction only by air pressure.

In this type of pneumatic defective product discharging device, when it is determined that the molded product is defective by judging the quality of the molded product, the defective molded product is crushed by a lower punch. The solenoid valve is opened for a specified time at the exact time when it is pushed out and reaches the defective product discharge position. As a result, the high-pressure air from the air supply source is guided to the air nozzle provided inside the rotation trajectory of the die, and the high-pressure air is jetted toward the outside of the rotating disk. By this injection, the defective molded product extruded by the lower punch onto the die mounting portion of the rotary disk is blown and discharged into the defective product discharge passage of the discharge conductor. Further, if the judgment is a good molded product, the discharging operation is not performed, so that the good molded product passes through the good product discharging portion of the discharge conductor by the rotation of the rotary disk and is moved outside the rotary disk by the scraper. It is supposed to be discharged.

[0005]

[Problems to be solved by the device]

 The discharge conductor has a defective product separation chamber formed in front of the non-defective product passage portion and facing the entrance of the defective product discharge passage, and air is ejected to the separation chamber by an air nozzle. However, the conventional defective product separation chamber is formed in a space considerably higher than the thickness of the molded product, and the air nozzle has a single nozzle hole or multiple nozzle holes arranged in parallel at the same height position. Since it is provided only at the lower end position of the defective product separation chamber so as to be able to face the molded product extruded on the die mounting part of the rotating disk, the injection area of the high pressure air by the air nozzle to the defective product separation chamber is It is only at the bottom of the defective product separation room.

By the way, the tip of a punch used in a rotary powder compression molding machine for producing tablets or the like having at least a lower surface, generally both surfaces having a spherical convex shape, has a concave surface corresponding to the tablet shape. Therefore, the defective molded product on the punch tip is peeled off along the concave surface when blown off by air.

Therefore, the defective molded product sometimes peeled off does not go to the defective product discharge passage, but jumps up toward the ceiling of the defective product separation chamber, comes out of the air injection region, and bounces back in the defective product separation chamber. There is a problem that it may pass through the passage part and mix with good molded products.

The object of the present invention is to prevent defective molded products blown off by high-pressure air from mixing with good molded products, and to improve the operation of rotary powder compression molding machines that can contribute to high-speed operation of rotary powder compression molding machines. To obtain a non-defective device.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the defective product discharging device of the rotary type powder compression molding machine of the present invention discharges the molded product extruded on the die mounting part of the rotary disc by the lower punch having the concave shape of the punch tip. In a device that is blown off into the defective product discharge passage of the discharge conductor by the air jetted from the air nozzle provided before the non-defective product passing portion of the conductor and inside the rotation trajectory of the die, The defective product separation chamber formed in front of the non-defective product passage portion and facing the entrance of the defective product discharge passage and the air injection region of the air nozzle with respect to the defective product separation chamber are substantially aligned with each other, and The air jet of the air nozzle extends over substantially the entire separation chamber.

[0010]

[Action]

 In the above configuration, since air is blown from the air nozzle over almost the entire defective product separation chamber, a defective molded product that is peeled off along the concave punch tip of the lower punch due to air blowing is blown out by air. It never leaves the area. Therefore, the defective molded product can be surely blown from the defective product separation chamber into the defective product discharge passage to prevent the defective molded product from passing through the defective product passage portion of the discharge conductor and being mixed with the defective molded product. Formula The powder compression molding machine can be operated at high speed.

[0011]

【Example】

 Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. Reference numeral 1 in FIGS. 1 and 2 denotes a rotary disk of a rotary powder compression molding machine for producing tablets having spherical convex surfaces on both sides, and a mortar mounting portion 1a thereof has a part as shown in FIG. A large number of dies 2 are attached at equal intervals along the direction of rotation. An upper punch 4 whose lower end is inserted into and removed from the mortar 2 is vertically movably passed through an upper pestle guide hole 3 provided on the rotary disc 1 so as to face the mortar 2. A lower punch 6 is pierced through a lower punch guide hole 5 provided so as to be opposed to the lower punch 6 so as to be vertically movable. The upper end of the lower punch 6 is inserted into the die 2 from below to form a die bottom, and the tip of the punch is concave, for example, spherical concave surface.

An arrow A in FIG. 2 indicates a rotation direction of the turntable 1. A powder feeder (not shown) is installed on the mortar mounting portion 1a of the rotary disc 1. The powder supplied from the feeder into the die 2 is weighed, and then compression-molded by the upper punch 4 and the lower punch 6 which are moved in a direction approaching each other by a pressure roller (not shown) at the compression-molding position, and The molded product formed in the mortar 2 is pushed out onto the mortar mounting portion 1a by the lower punch 6 and hits a scraper described later to be taken out of the rotary disc 1.

At the compression molding position, a sensor (not shown) such as a load cell for detecting the molding load applied to the lower punch 6 is provided. When performing compression molding with the weight set to a predetermined target value, the molding load is detected as described above.However, when performing compression molding with the thickness of the molded product set to a predetermined target value, Instead of the load cell, a displacement sensor for detecting the distance between the tips of the upper and lower punches 4, 6 is used.

The discharge conductor 7 is provided at a position from the position where the molded product is pushed out by the lower punch 6 onto the die mounting portion 1a to the position where the powder feeder is provided, that is, the molded product discharge position. It is arranged. The discharge conductor 7 is integrally provided with a lid 9 on the upper surface of a conductor base 8. The conductor base 8 has a rotating plate overlapping portion 8A of a lower surface opening which is brought into close or slight sliding contact with the upper surface of the die mounting portion 1a, and this overlapping portion. 8A and a base portion 8B which is integrated with the rotating disc 1 and is located outside the rotary disc 1. The base portion 8B is screwed to a fixed supporting plate 10 (see FIG. 1) installed around the rotating disk 1.

The turntable overlap portion 8A is arranged so as to intersect with the rotation locus of the mortar 2 (represented by the one-dot chain line B in FIG. 2), and the overlap portion 8A on the powder feeder side is located. The wall portion is used as a scraper 11 that obliquely intersects the rotation locus B.

The inside of the conductor base 8 is located on the non-defective product discharge passage 12 on the powder feeder side, and on the front side of this passage 12 (as viewed from the moving direction of the molded product that is moved together with the turntable 1). A partition wall 14 for partitioning the defective product discharge passage 13 is integrally provided, and the partition wall 14 is separated from the tip of the scraper 11 with the rotation locus B in between, and a gap therebetween serves as a good product passing portion 15. It is used.

A non-defective product discharge chute 16 (see FIG. 2) is connected to the non-defective product discharge passage 12 on the lower surface of the base portion 8B. Similarly, a defective product discharge chute 17 is connected to the defective product discharge passage 13 on the lower surface of the base portion 8B. In addition, reference numeral 18 in FIG. 1 denotes a defective product receiving container that receives a defective molded product guided by the defective product discharging suit 17, and a similar good product receiving container (not shown) corresponds to the defective product discharging chute 16. It is provided. The base 8B side portion of the defective product discharge passage 13 has a curved (or inclined) introducing surface 19 for guiding the defective molded product toward the defective product discharge chute 17.

The lid 9 is provided so as to close the upper surface opening of the conductor base 8. An air nozzle 20 facing the introduction surface 19 is provided in a portion of the lid 9 located inside the rotation locus B. The air nozzle 20 is disposed in front of the non-defective product passing portion 15 (as viewed from the moving direction of the molded product that is moved together with the rotary disc 1) and is located between the defective product discharge passage 13 and the inlet 13a. 21 is formed. The separation chamber 21 faces the entrance 13a and the non-defective product passage portion 15, respectively.

The air nozzle 20 has one nozzle hole 22 at its lower end, that is, at a position close to the upper surface of the die mounting portion 1a. The nozzle hole 22 blows high-pressure air toward the defective product separation chamber 21. Then, the air injection region of the air nozzle 20 and the volume of the defective product separation chamber 21 are made substantially equal to each other so that the air injection from the nozzle hole 22 extends to almost the entire defective product separation chamber 21.

For this reason, in this embodiment, the build-up piece 23 is provided, for example, by adhesion, on the portion of the lid 9 corresponding to the ceiling of the defective product separation chamber 21. The padding piece 23 may be integrally formed with the lid 9. By this build-up piece 23, the actual ceiling height of the defective product separation chamber 21 is reduced to reduce the volume of the defective product separation chamber 21 so that the air jet from the nozzle holes 22 is distributed over almost the entire defective product separation chamber 21. It is set to extend.

In the build-up piece 23, the height D from the upper surface of the die mounting portion 1a to the ceiling of the defective product separation chamber 21 is equal to or more than the thickness F of the molded product E, and as a preferable example, the molded product E A material having a thickness set to be twice the thickness F or less is used. Moreover, the padding piece 23 has an inclined surface 23a which is continuous with the inner surface of the lid 9.

Therefore, the defective product discharge passage 13 and the defective product separating chamber 21 which are continuous with each other are narrowed by lowering the ceiling height in the portion of the defective product separating chamber 21 and going from this part toward the introduction surface 19 side. Therefore, at first, the ceiling height gradually expands, and after this expanded ceiling height has continued for some time, the ceiling height gradually decreases due to the introduction surface 19, and the cross-sectional area other than the defective product separation chamber 21 is gradually reduced. The structure does not have a narrowed portion.

As shown in FIG. 1, the air nozzle 20 is connected to an air supply source 25 such as a pressure tank via an electromagnetic valve 24. The electromagnetic valve 24 normally keeps a closed state, and the normally closed electromagnetic valve 24 is controlled by the judging device 26 to be opened appropriately.

A target value is preset in the judging device 26, and a detection signal from a sensor such as the load cell is inputted. The determiner 26 compares the target value with the input detection signal to determine the quality of the molded product. Further, when the judging device 26 judges the defective molded product based on the judgment, the timing when the judged defective molded product is pushed out by the lower punch 6 onto the upper surface of the die mounting portion 1a and just reaches the molded product taking-out position. It is configured to output a control signal for opening the solenoid valve 24 for a predetermined time at the same time.

During the operation of the rotary powder compression molding machine, the judging device 26 compares the target value set therein with the detection signal from the sensor input each time compression molding is carried out, and the molded product E is molded. Is a non-defective product or a defective product.

When the defective molded product is determined, the determiner 26 outputs a control signal, and accordingly, the solenoid valve 24 is opened for a predetermined period of time in accordance with the timing. Then, high-pressure air from the air supply source 25 is supplied to the air nozzle 20 through the solenoid valve 24, so that the defective product separation chamber is discharged from the nozzle hole 22 of the air nozzle 20 arranged inside the rotation locus B of the die 2. High pressure air is injected into the inside 21.

Therefore, the defective molded product which has already been extruded by the lower punch 6 on the die attachment portion 1a is separated from the punch tip of the lower punch 6 by the high pressure air blown in the defective product separation chamber 21, and the defective product It is blown into the discharge passage 13. Since the above operation is continued while the solenoid valve 24 is open, several to several tens of molded products before and after the defective molded product are actually blown off one after another, thereby ejecting the defective molded product. Prevents mistakes.

In the blow-off, even if a defective molded product jumps up along the curved concave surface of the punch tip, the jumping up is immediately limited by the build-up piece 23, and the defective nozzle separation chamber 21 of the air nozzle 20 is removed. The defective molded product that has been peeled off does not move outside the injection area. Therefore, the high-pressure air jetted from the air nozzle 20 can be surely blown to the jumped defective molded product, and the defective molded product can be surely blown into the defective product discharge passage 13. Can be prevented from passing through the good product passing portion 15 and being mixed with the good molded product.

Moreover, the defective molded product blown off as described above hits the introduction surface 19 of the defective product discharge passage 13, but since the introduction surface 19 is curved, it bounces back toward the defective product separation chamber 21. Instead, it is repelled below the introduction surface 19 and is rapidly guided to the defective product discharge shoot 17 and discharged to the defective product receiving container 18. Therefore, also in this respect, it is possible to prevent the defective molded product from passing through the good product passing portion 15.

As described above, it is possible to prevent a defective molded product from mixing with a good molded product. Therefore, it is possible to increase the operating speed of the rotary powder compression molding machine equipped with this defective product discharging device and improve the tablet production efficiency.

Moreover, in the first embodiment, only the defective product separation chamber 21 in which the defective molded product is blown off is narrowed by the build-up piece 23, and the air from the air nozzle 20 is provided over substantially the entire separation chamber 21. Since the injection is performed, a part of the defective product discharge passage 13 is narrowed, and there is no fear that defective molded products and the like discharged there will be clogged, and reliable discharge of defective products can be guaranteed.

When a good molded product is manufactured and the determination unit 26 does not output a control signal, the defective molded product is not discharged by the high-pressure air. Therefore, the non-defective product extruded on the upper surface of the die mounting portion 1a of the rotating disk 1 hits the scraper 11 through the non-defective product passing portion 15, and accordingly, the non-defective product is separated from the lower punch 6 and discharged along the scraper 11 in the non-defective product. It is guided to the passage 12 and is taken out of the rotating disk 1 through the passage 12.

FIG. 3 shows a second embodiment of the present invention. In the second embodiment, the entire portion 9a of the lid 9 of the discharge conductor 11 that covers the defective product discharge passage 13 is lowered, and the non-defective product passing portion is used without using the build-up piece used in the first embodiment. The air injection area of the air nozzle 20 and the defective product separation chamber are formed so that the air injection of the air nozzle 20 extends over substantially the entire defective product separation chamber 21 formed in front of 15 and facing the entrance 13a of the defective product discharge passage 13. 21 is made to correspond substantially. Since the configuration other than this point is the same as that of the first embodiment including the parts not shown, the same components are designated by the same reference numerals and the description thereof will be omitted.

Also, in the structure of the second embodiment as described above, as in the first embodiment, it is possible to suppress the jumping up from the lower punch 6 of the molded product, and to surely secure the high pressure empty space to the molded product. Since the air can be discharged by blowing air, the intended purpose of the present invention can be achieved, and the construction can be simplified by omitting the padding piece.

4 and 5 show a third embodiment of the present invention. In the third embodiment, the height D of the non-defective product separation chamber 21 is formed to be the same as the height of the non-defective product passing portion 15 which is several times or more the thickness F of the molded product E. Instead of the padding piece, an air nozzle 20 having a large number of nozzle holes 22 is adopted. These many nozzle holes 22 face the entire defective product separation chamber 21 from the inside of the rotation trajectory B of the die 2. By adopting the air nozzle 20, the defective product separation chamber 21 has a high ceiling height as described above, and the defective product separation chamber 21 has a large volume. The air injection region of the air nozzle 20 and the defective product separation chamber 21 can be substantially aligned with each other so that the air is ejected from the nozzle 20. Since the configuration other than this point is the same as that of the first embodiment including the part not shown, the same components are designated by the same reference numerals and the description thereof will be omitted.

In the structure of the third embodiment as described above, the defective product separation chamber 21 has a high ceiling height, so that the molded product separated from the lower punch 6 easily jumps up. As in the case of the first embodiment, the high-pressure air can be surely blown to the peeled molded product, so that the intended purpose of the present invention can be achieved also in the third embodiment. The present invention is not limited to the above embodiments. For example, the discharge conductor 7 and the scraper 11 may be separately provided.

[0037]

[Effect of device]

 As described in detail above, according to the defective product discharging device of the rotary powder compression molding machine of the present invention, the defective molded product peeled off along the concave punch tip of the lower punch by the blowing of air is Since it does not come off from the injection area, the defective molded product is surely blown from the defective product separation chamber into the defective product discharge passage, and the defective molded product passes through the good product passage part of the discharge conductor and mixes with the good molded product. And the rotary powder compression molding machine can be operated at high speed.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a configuration of a defective product discharging device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the configuration of the defective product discharging device according to the first embodiment, taken along line ZZ in FIG.

FIG. 3 is a vertical sectional side view showing a configuration of a defective product discharging device according to a second embodiment of the present invention.

FIG. 4 is a vertical sectional side view showing the configuration of a defective product discharging device according to a third embodiment of the present invention.

FIG. 5 is a cross-sectional view showing the configuration of a defective product discharging device according to the third embodiment, taken along line YY in FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotating disk, 1a ... Mortar attachment part, 2 ... Mortar, 6 ... Lower punch, 7
... discharge conductor, 13 ... defective product discharge passage, 13a ... entrance of defective product discharge passage, 14 ... non-defective product passage portion, 20 ... air nozzle, 21 ... defective product separation chamber, 22 ... nozzle hole, 23 ...
Meat piece. 24 ... Solenoid valve, 2
5 ... Air supply source, 26 ... Judgment device,
B ... Rotation locus of the mortar.

Claims (1)

[Scope of utility model registration request] 1. A non-defective product passing portion and a defective product discharge passage of a molded product extruded onto a die mounting portion of a rotary disk by a lower punch which is provided so as to intersect with a rotation path of a die and has a concave punch tip shape. The discharge conductor has, an air nozzle that is provided in front of the non-defective product passing portion and inside the rotation path, and injects air toward the defective product discharge passage, and a normally closed air nozzle. A target value is set with an air supply source that supplies air via a solenoid valve, and the target value is compared with the detection signal obtained during compression molding to determine the quality of the molded product, and When a judgment is made, the electromagnetic valve is operated to open for a predetermined time, and a defective product separating chamber formed in front of the non-defective product passage and facing the entrance of the defective product discharge passage is formed. Air nose throughout Defective discharge device for rotary powder compression molding machine, characterized in that is substantially coincident with the air ejection area of the air nozzle so that the air jet extends over the said defective separation chamber.