JPH0243596Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a method for discharging molded products determined to be defective out of the rotary disk out of the molded products molded in a rotary powder compression molding machine. Regarding defective product ejection equipment.

[Conventional technology]

In a rotary powder compression molding machine, the molding load applied to the pressure roll is constantly detected by a sensor such as a load cell, and the detection output of this sensor is input to a judge and compared with the target value set in the judge. Then, it is determined whether the molded product is a good product or a defective product. Then, the determined defective molded products are removed by a discharge device installed in the defective product ejection device, which is located between the position where the molded product is pushed up with the lower pestle onto the mortar attachment part of the rotary disk and the position where the molded product is taken out by the scraper. It is taken out of the rotary disk by a device.

A conventional ejection device consists of a drive source such as a solenoid or air cylinder that is operated based on a control signal from the above-described judger, an ejection damper or ejection scraper that is operated by the drive source, and an ejection damper or the like that is returned to its original position. It is formed with a return member such as a return spring for returning to the original state. The discharge damper rotates toward and away from the upper surface of the mortar mounting portion of the rotary disk from above, or moves vertically in parallel. This discharge damper is normally in the raised position, and when it is lowered so as to touch the upper surface of the mortar attachment part to divide the rotation locus of the mortar, it guides the non-formed products out of the rotary disk. In addition, the discharge scraper is
It is reciprocated along the upper surface of the mortar attachment part so that it can be taken in and out without any change in height from the outside of the rotary disk until it reaches a position intersecting the rotation locus of the mortar. This scraper is normally located in a position where it does not obstruct the rotational trajectory of the mortar, and when it moves forward along the top surface of the mortar mounting part to partition the rotational trajectory of the mortar, it guides the defective molded product out of the rotary disk. It is something.

[Problem that the invention attempts to solve]

However, since the conventional structure operates mechanically as described above, there is a limit to how fast the response operation of the discharge damper or discharge scraper can be. At the same time, the good molded products before and after it must also be discharged at the same time.
It was not possible to expect reliable discharge of defective molded products. Therefore, it is impossible to prevent a large number of good molded products from being discharged at the same time, resulting in a problem that many good molded products are lost. Furthermore, in the case of a discharge device using a discharge damper, when the discharge damper is lowered, the molded product pushed out onto the mortar mounting portion of the rotary disk may be pinched and a good molded product may be damaged. Furthermore, when the ejection damper or ejection scraper operates to partition the rotation trajectory of the mill, the molded product may be thrown away as it moves and may end up in an undesirable location, such as a feeder with an opening on the top surface. There was a problem. Moreover, since the conventional devices have mechanical operating parts, there is a problem in that they tend to malfunction due to the influence of dust.

[Means for solving problems]

In order to solve the above-mentioned conventional problems, the defective product discharging device of the rotary powder compression molding machine according to the present invention has the following features:
A cylindrical discharge conductor is provided to intersect with the rotation locus of the die at the defective product discharge position, and has a notch for passage of the molded article pushed out onto the die attachment part of the rotary disk by the lower punch, and the rotation locus. an air nozzle located inside the exhaust conductor and having an injection port for injecting air toward the other end of the exhaust conductor located outside the rotary disk; an air injector that is provided and sucks air in the discharge conductor toward the other end of the discharge conductor, an air supply source that supplies air to the air nozzle via a normally closed solenoid valve, and a target value set. In addition, by comparing this target value with a detection signal obtained during compression molding, it is determined whether the molded product is good or bad, and when a defective product is determined, the above-mentioned solenoid valve is opened for a predetermined period of time. The present invention is characterized by comprising a determiner that outputs a control signal.

[Effect]

During operation of the rotary powder compression molding machine, the determination device compares the target value set therewith with the detection signal input each time compression molding is performed, and determines whether the molded product is good or defective. Determine whether the product is of good quality. When the molded product is determined to be defective, the determiner outputs a control signal. Based on this control signal, the solenoid valve opens for a predetermined period of time.
This valve opening operation is timed to coincide with the time when the molded product molded at the compression molding position is pushed out onto the mortar attachment part of the rotating disk by the lower punch and just reaches the defective product discharge position. When the solenoid valve opens, the air supply source supplies high-pressure air to the air nozzle through the solenoid valve, so that the air nozzle placed inside the rotary locus of the mortar blows the rotary plate from its injection port. Blows high-pressure air outward. On the other hand, air is also supplied to the air injector, and this air is ejected into the discharge conductor to suck the air inside this conductor toward the outside of the rotary disk. Therefore, the defective molded product pushed out onto the mortar attachment part of the rotary disk within the discharge conductor is blown away toward the outside of the rotary disk by the high-pressure air injected from the above-mentioned injection port, and is also The suction air flow formed in the discharge conductor by the suction air is sucked toward the outside of the rotary disk. At this time, the discharge conductor guides the movement of the defective molded product, and the dust on the mortar attachment part of the rotary disk is also discharged together. In this way, defective molded products are discharged out of the rotary disk through the discharge conductor. In addition, if the above-mentioned determiner does not output a control signal, the ejecting operation of defective molded products by the above-mentioned high-pressure air is not performed, and the good molded products pushed up onto the mortar attachment part of the rotary disk are removed by the rotation of the rotary disk. It passes through the notch in the discharge conductor.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a rotary disk of a rotary powder compression molding machine, and a large number of dies 2 are mounted on the same circumference at equal intervals. An upper punch 4, the lower end of which is inserted into and removed from the mortar 2, is attached to the upper punch guide hole 3 provided on the rotary disk 1 so as to be slidable in the vertical direction. A lower punch 6 whose upper end is inserted into the mortar 2 is attached to the lower punch guide hole 5 so as to be slidable in the vertical direction.

A powder feeder (not shown) is installed on the mortar mounting portion 1a of the rotary disk 1, and a scraper (not shown) for taking out a good molded product from the rotary disk 1 is also installed. After the powder supplied from the powder feeder into the mortar 2 is weighed, it is compression-molded by an upper punch 4 and a lower punch 6 that are moved toward each other by a pressure roller (not shown) at a compression-molding position. , and the molded product A in the mortar 2 is pushed out onto the mortar mounting portion 1a by the lower punch 6, hits the scraper, and is taken out of the rotary disk 1.

Furthermore, a sensor such as a load cell for detecting the molding load applied to the lower punch 6 is provided at the compression molding position. Note that when compression molding is performed with the weight set to a predetermined target value, the molding load is detected as described above, but when compression molding is performed with the thickness set to a predetermined target value, upper and lower punches 4 are used instead of the load cell. , 6 are used to detect the spacing between the punch tips.
Moreover, in this embodiment, the configuration of the lower punch guide track (not shown) for moving the lower punch 6 up and down includes a track portion that lowers the molded product A after once extruding it from the mortar 2, thereby moving the molded product in the mold. When the lower punch 6 is lowered, it is inflated on the upper surface of the mortar 2 and caught on the upper surface of the mortar 2, thereby further improving the mold releasability between the lower punch 6 and the molded product A. Note that such a configuration may be omitted in the present invention.

The molded product A is the mortar attachment part 1a of the turntable 1.
A cylindrical discharge conductor 7 is provided at a position between the position where the molded product is pushed out by the lower punch 6 and the position where the molded product is taken out by the scraper (not shown), that is, the defective product discharge position. This discharge conductor 7 is
It is provided with a cylindrical rotary disk overlapping portion 7a with an opening on the lower surface that is close to or in slight sliding contact with the upper surface of the mortar attachment portion 1a, and a cylindrical portion 7b located on the outside of the rotary disk 7. The rotary disk overlapping portion 7a is disposed to intersect with the rotation locus B of the mortar 2 (see FIG. 2, the arrow in the figure indicates the rotation direction), and at least on both sides of the overlapping portion 7a. A notch 17 is provided on the side surface of the rotary disk 1 located on the front side in the rotational direction, through which the molded product A pushed out onto the upper surface of the mortar attachment part 1a by the lower punch 6 passes.
is formed.

Further, an air nozzle 8 is provided inside the rotation locus B, for example, at the tip of the rotary disk overlapping portion 7a of the discharge conductor 7. This nozzle 8 has an injection port 9 that injects high-pressure air toward a cylindrical portion 7b of the discharge conductor 7 located outside the rotary disk 1. As shown in FIG. 2, there are a plurality of injection ports 9 in this embodiment, and they are provided diagonally so that the high-pressure air flows ejected from these ports are merged.

Moreover, the air injector 1 is located outside the rotation locus B of the exhaust conductor 7, for example, at the cylindrical portion 7b.
0 is set. This injector 10 is equipped with a large number of nozzles 11, and these nozzles 11
is connected to the cylindrical portion 7b to receive the defective molded product and the container 1
The high-pressure air is ejected toward the guide tube 13 that guides the air.

Further, the air nozzle 8 and air injector 10 are connected to an air supply source 15 such as a pressure tank via a solenoid valve 14. Note that 18 in FIG. 1 is an air distributor. The solenoid valve 14 is always closed, and the normally closed solenoid valve 14 is controlled to be opened by the determiner 16. A target value is set in advance in the judger 16, and a detection signal from a sensor such as the load cell is inputted to the judger 16, and the judger 16 compares the target value with the input detection signal to determine whether the molded product It is used to determine whether the product is good or bad. Furthermore, when determining a defective molded product by the above-described determination, the determiner 16 determines that the determined defective molded product is placed in the mortar attachment part 1 with the lower punch 6.
When the defective product is pushed out to the upper surface of a and reaches the above defective discharge position, the solenoid valve 1 is activated.
4 for a predetermined period of time.

Next, the operation of the defective product discharging device having the above configuration will be explained.

During operation of the rotary powder compression molding machine, the determination device 16 compares and determines the target value set therewith with the detection signal from the sensor input each time compression molding is performed, and determines whether the molded product A is a good product. However, it is determined whether the product is defective.

When the molded product is determined to be defective, the determiner 16 outputs a control signal, and the solenoid valve 14 is opened for a predetermined period of time based on this control signal. High pressure air from the air supply source 15 is then simultaneously supplied to the air nozzle 8 and the air injector 10 through the solenoid valve 14 and the air distributor 18.

Therefore, high-pressure air is injected outward from the rotary disk 1 from the injection port 9 of the air nozzle 8.
Inside the discharge conductor 7, the mortar attachment part 1a of the rotary disk 1
The defective molded product pushed upward is blown away toward the outside of the rotary disk 1 by high-pressure air injected from the injection port 9. At the same time, the air injector 10
High pressure air flows into the discharge conductor 7 from the nozzle 11 of the first
Since the air is blown in the direction of the arrow shown by the solid line in the figure, a suction air flow directed to the outside of the rotary disk 1 as shown by the dotted chain line in FIG. 1 is formed in the discharge conductor 7. This air flow sucks in defective molded products and dust on the mortar attachment portion 1a.

The defective molded products moved by these air forces are discharged into a receiving container 13 through a guide tube 12 using the discharge conductor 7 as a guide.

That is, as described above, defective molded products are discharged from the rotary disk 1 by air force, so there is no risk of malfunction due to dust, and the response speed of discharge can be significantly increased. By doing so, not only can defective molded products be reliably discharged, but also the number of good molded products that are simultaneously discharged and wasted can be eliminated or extremely reduced. Moreover, since the defective molded products are blown off and discharged by air force, and the blown molded products are guided by the discharge conductor 7, there is a risk that the discharged molded products may be damaged or thrown into the feeder. There is no such thing and it can be discharged.

Further, when the above-mentioned determiner 16 does not output a control signal, the ejection operation of the defective molded product by the above-mentioned high-pressure air is not performed, and the good molded product pushed up onto the rotary plate 1 is removed by the rotation of the rotary plate 1. It passes through the notch 17 of the discharge conductor 7 as the discharge conductor 7 moves.

In addition, in the present invention, the operating timing of the air injector does not have to be at the same time as the operating timing of the air nozzle; for example, the air injector may be operated continuously, or may be operated from slightly before to slightly after the operating timing of the air nozzle. You can.

In addition, when implementing the present invention, unless it is contrary to the gist of the invention, discharge conductors, notches, air nozzles,
It goes without saying that the specific structure, shape, position, material, etc. of the injection port, air injector, electromagnetic valve, determination device, etc. are not limited to the one embodiment described above, and can be configured and implemented in various ways. be.

[Effect of idea]

According to the present invention, the gist of which is the structure described in the scope of the above-mentioned utility model registration claims, the time required to discharge defective molded products can be significantly shortened. Even at high speeds, the number of good molded products wastefully ejected during ejection can be minimized or eliminated, and the molded products can be prevented from being damaged or thrown to undesirable locations during ejection. It has practical effects such as no malfunction due to the influence of dust.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional side view, and FIG. 2 is a sectional view taken along the line - in FIG. 1. 1... Turntable, 2... Mortar, 6... Lower pestle, 7...
Discharge conductor, 8...Air nozzle, 9...Injection port, 1
0... Air injector, 14... Solenoid valve, 15
...Air supply source, 16...Judgment device, 17...Notch.

Claims (1)

[Scope of utility model registration request] A cylindrical discharge conductor is provided to intersect with the rotation locus of the die at the defective product discharge position, and has a notch for passage of the molded article pushed out onto the die attachment part of the rotary disk by the lower punch, and the rotation locus. an air nozzle located inside the exhaust conductor and having an injection port for injecting air toward the other end of the exhaust conductor located outside the rotary disk; an air injector that is provided and sucks air in the discharge conductor toward the other end of the discharge conductor, an air supply source that supplies air to the air nozzle via a normally closed solenoid valve, and a target value set. In addition, by comparing this target value with a detection signal obtained during compression molding, it is determined whether the molded product is good or bad, and when a defective product is determined, the above-mentioned solenoid valve is opened for a predetermined period of time. 1. A defective product discharge device for a rotary powder compression molding machine, comprising: a determining device that outputs a control signal.