JPH0324313Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention uses air pressure to remove molded products that are determined to be defective from among the molded products molded in a rotary powder compression molding machine. This invention relates to a device for discharging defective products.

[Conventional technology]

A device for ejecting defective products using air pressure instead of a mechanically operated ejection damper or ejection scraper was devised by the present applicant and filed in 1983.
-It has been filed as No. 22867.

This thing has a discharge conductor which is provided to intersect with the rotation locus of the die at the defective product discharge position and has a passage section for the molded article pushed out onto the die attachment part of the rotary disk by a lower punch, and an air nozzle located inside the rotary disk that injects air toward the outside of the rotary disk; an air supply source that supplies air to the air nozzle via a normally closed solenoid valve; and a target value. and a determination device that determines whether the molded product is good or bad by comparing this target value with a detection signal obtained during compression molding, and opens the solenoid valve for a predetermined time when a defective molded product is determined. It is equipped with.

In this conventional discharging device, when a molded product is determined to be defective by comparison judgment using the judging device, the defective molded product is pushed out of the mortar with the lower punch until it reaches the defective product discharge position. At the same time, the solenoid valve is opened for a predetermined period of time based on the control signal output from the determination device, and the high-pressure air from the air supply source is flowed from the air nozzle to the outside of the rotary disk. It is sprayed towards. Therefore, the defective molded product extruded onto the mortar mounting portion can be blown away within the discharge conductor and discharged through the discharge conductor. In addition, in the case of a good molded product, the discharge operation by the above air pressure is not performed, so the good product pushed out to the upper surface of the mortar attachment part passes through the discharge part of the discharge conductor as the rotary disk rotates, and is removed by the scraper. It is discharged outside the rotary disk.

[Problem to be solved by the invention] By the way, since the molded product is attached to the upper surface of the lower punch due to its compression molding, in the conventional ejection device, the lower punch is removed by high pressure air injected from the air nozzle. The defective molded product must be peeled off from the top surface and blown away at the same time.

For this reason, there is no problem when compression molding powder with low adhesion, but when compression molding powder with high adhesion and therefore poor releasability from the lower punch, or when the upper surface of the lower punch is If the molded product has poor release properties from the lower punch due to unevenness for forming marks, etc., or if the molded product is integrally extended from the molded product into the clearance between the mortar hole and the lower punch during molding. In other words, under molding conditions where the molded product has poor releasability from the lower punch, such as when the released burr enters and as a result the molded product has poor releasability from the lower punch, high-pressure air blowing alone is not sufficient. However, there was a problem that the reliability of separating defective molded products from the lower punch was poor.

The purpose of the present invention is to provide a defective product discharge device for a rotary powder compression molding machine that can reliably discharge defective molded products even if the molded product has poor releasability from the lower punch. .

[Means for solving problems]

In order to achieve the above object, in the defective product discharge device of the present invention, a discharge conductor having a passage section for the molded product extruded onto the mortar attachment part of the rotary disk by the lower punch is provided with a An air nozzle that injects air toward the outside of the rotary disk is provided, and a molded product contact portion that slightly protrudes into the movement trajectory of the molded product is provided on the front side of the air nozzle when viewed from the moving direction of the molded product. It was established in

[Effect]

In this invention, by providing a molded product contacting part that slightly protrudes into the movement trajectory of the molded product on the front side of the air nozzle, the molded product extruded onto the mortar attachment part will be able to reach the air nozzle before it faces the air nozzle. Contacts the molded product contact area. Due to the impact caused by this contact, the molded product adhering to the upper surface of the lower punch is forcibly peeled off from the lower punch.

〔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 is attached to the lower punch guide hole 5 so as to be slidable in the vertical direction with its upper end inserted into the mortar 2.

Note that a powder feeder (not shown) is installed on the mortar attachment part 1a of the rotary disk 1, and a first
In the figure, X indicates the rotation direction of the rotary disk 1. The powder fed into the mortar 2 from the powder feeder is weighed and then 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. ,
The molded product in the mortar 2 is pushed out onto the mortar mounting portion 1a by the lower punch 6, and is taken out of the rotary disk 1 by hitting a scraper, which will be described later.

A sensor (not shown) such as a load cell for detecting the molding load applied to the lower punch 6 is provided at the compression molding position. When performing compression molding 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 sensors are used instead of the load cell. Pestle 4,6
A sensor is used to detect the distance between the punch tips.

The molded product A is the mortar attachment part 1a of the turntable 1.
A discharge conductor 7 is provided at a position between the position where the powder is pushed out by the lower punch 6 and the position where the powder feeder is provided, that is, the molded product discharge position. This discharge conductor 7 is constructed of a conductor base 8 made of synthetic resin, consisting of a rotary disk overlapping portion 8A with an opening on the lower surface that is in close or slight sliding contact with the upper surface of the mortar attachment portion 1a, and a base portion 8B located on the outside of the rotary disk 7. A fixed lid 9 and a movable lid 10 are attached to the upper surface.

The rotary disk overlapping portion 8A is arranged to intersect with the rotation locus B of the mortar 2, and the wall portion of the overlapping portion 8A on the powder feeder side (upper side in FIG. 1) is diagonal to the rotation locus B. scraper 11 intersecting with
It is formed as. And conductor base 8
The inside is connected to the good product discharge groove 12 and the defective product discharge groove 1.
It integrally has a partition wall 14 that partitions it into three parts. The base 8B has a non-defective product discharge port 1 that communicates with the non-defective product discharge groove 12.
5 is provided, and a guide tube 16 for guiding the good molded product to a good product receiving container (not shown) is connected to this. Further, the base 8B is provided with a defective product discharge port 17 communicating with the defective product discharge groove 13, and a guide tube 19 for guiding the defective molded product to a defective product receiving container 18 is connected to this.

The fixed lid 9 is made of a transparent synthetic resin plate, and is screwed to close the upper opening of the non-defective product discharge groove 12. Note that 20 is a mounting screw for the fixed lid 9, which can be attached or detached by hand without using any tools. The movable lid 10 is also made of a transparent synthetic resin plate, which closes the upper opening of the defective product ejection groove 13 and points as shown by the arrow Y in FIG.
It is screwed so that it can be moved in the Z direction. In addition, 21 is a mounting screw for the movable lid 10, which can be attached and removed by hand without using tools, and 22 in FIGS. 1 and 2 is a long hole that allows the movable lid 10 to be moved. be.

The tip of the movable lid 10 on the center side of the rotary disk 1 is located inside the rotation locus B. In this part, a passage part 23 is formed between the partition wall 14 and the wall part 8 of the rotary disk overlap part located on the opposite side of the scraper 11 with the partition wall 14 as a boundary.
An end wall 25 forming an introduction section 24 between the end wall 25 and the end wall 25 is integrally provided with the end wall 25 . The passage part 23 is the good product discharge groove 12
It serves as the entrance to the

Further, the end wall 25 is provided with an air nozzle 26 that injects high-pressure air toward the base 8B located outside the rotary disk 1. Further, the end wall 25 has a molded product contacting portion 27 on the side opposite to the passage portion 23 with the air nozzle 26 as a boundary, in other words, on the front side of the air nozzle 26 when viewed from the moving direction of the molded product A, for example. It is provided close to the air nozzle 26. This contact portion 27 is formed by a convex portion that slightly projects into the movement trajectory C (indicated by the two-dot chain line in FIG. 1) of the molded product A pushed out onto the mortar attachment portion 1a by the lower punch 6. The degree of protrusion of the molded product contacting portion 27 into the movement trajectory C is determined so that the molded product A can pass without being thrown off, and can be adjusted by adjusting the Y and Y of the movable window 10. This is done by moving in the Z direction.

Further, the air nozzle 26 is connected to an air supply source 29 such as a pressure tank via a solenoid valve 28. The solenoid valve 28 is always kept closed, and the normally closed solenoid valve 28 is controlled to be opened by the determiner 30. A target value is set in advance in the determiner 30, and a detection signal from a sensor such as the load cell is inputted to the determiner 30, and the determiner 30 compares the target value with the input detection signal and determines the molded product. It is used to judge whether the quality is good or bad. Furthermore, when determining a defective molded product based on the determination, the determiner 16 determines the timing when the determined defective molded product is pushed out onto the upper surface of the mortar mounting portion 1a by the lower punch 6 and has just reached the molded product removal position. Together, the configuration outputs a control signal that opens the solenoid valve 28 for a predetermined period of time.

When operating the rotary powder compression molding machine, the judgment unit 3
0 compares and determines the set target value with a detection signal from a sensor that is input each time compression molding is performed, and determines whether the molded product A is a good product or a defective product.

When the molded product is determined to be defective, the determiner 30 outputs a control signal, and based on the control signal, the solenoid valve 28 is opened for a predetermined period of time. Then, the high pressure air from the air supply source 29 is supplied to the solenoid valve 28.
High-pressure air is supplied to the air nozzle 26 through the air nozzle 26, and the high-pressure air is injected outward from the rotary disk 1. Therefore, if a defective molded product is extruded by the lower punch 6 onto the mortar attachment part 1a, the air nozzle 2 is
High pressure air from 6 is blown.

By the way, whether the molded product A is a good product or a defective product, it is pushed out onto the mortar attachment part 1a by the lower punch 6 and is introduced into the introduction part 24 of the rotary plate overlap part 8A of the defective product discharge device 7. As soon as it is introduced, it comes into contact with the molded product contact portion 27 and receives an accompanying impact. For this reason, not only molded products with good mold releasability but also high adhesion, unevenness on the upper surface of the lower punch 6, or burrs are formed in the clearance between the mortar hole and the lower punch 6. Even in the case of molded products A having poor mold releasability due to such reasons, these molded products A can be forcibly peeled off from the upper surface of the lower punch 6.

Therefore, immediately after the defective molded product is forcibly peeled off by the lower punch 6, high-pressure air is blown from the air nozzle 26, so that this air reliably removes the defective molded product into the defective product discharge groove 13. You can blow away items. The defective molded products blown away in this way are discharged into the defective product receiving container 18 via the guide tube 19.

Further, when the determination unit 30 does not output a control signal, the above-described operation of discharging defective molded products using high-pressure air is not performed. Therefore, as the rotary disk 1 rotates, the good molded product extruded onto the mortar attachment portion 1a of the rotary disk 1 comes into contact with the scraper 11 through the passage portion 23, so that the molded product extruded onto the mortar attachment portion 1a of the rotary disk 1 comes into contact with the scraper 11 along this passage. 1
a and is taken out through the non-defective product discharge groove 12. Moreover, in this case, as described above, the good molded product is also forcibly peeled off from the lower punch 6 by contact with the molded product contact portion 27, so the scraper 1
This eliminates the possibility of failure to take out a good molded product due to No. 1.

In addition, when implementing the present invention, the discharge conductor 7 and the scraper 11 may be provided separately. The molded product contacting part 27 may be provided at a distance from the air nozzle 26, or may be provided separately from the air nozzle part, and may also be provided on the opposite side of the air nozzle 26 with respect to the rotation locus B. In other words, the movement trajectory C
There is no problem even if it is installed outside of the

[Effect of idea]

As explained above, in the defective product discharging device of the present invention, the discharge conductor, which has a passage section for the molded product extruded by the lower punch onto the mortar attachment part of the rotary disk, is provided with the In addition to providing an air nozzle that injects air outward, a molded product contact portion that slightly protrudes into the movement trajectory of the molded product is provided.
The air nozzle is installed on the front side of the air nozzle when viewed from the direction of movement of the molded product, and the molded product adhered to the upper surface of the lower punch can be forcibly separated from the lower punch before being blown away with high-pressure air. With the high-pressure air, there is no need to peel off the defective molded product from the upper surface of the lower punch, and even if the molded product has poor releasability with respect to the lower punch, the defective product can be reliably ejected regardless of this.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a partially cutaway plan view of the main part, Fig. 2 is a sectional view taken along the line - in Fig. FIG. DESCRIPTION OF SYMBOLS 1... Rotating disk, 1a... Mortar attachment part, 6... Lower punch, 7... Discharge conductor, 23... Passing part, 26...
Air nozzle, 27... Molded product contact part, 28... Solenoid valve, 29... Air supply source, 30... Judgment device, A
...molded product, B...rotation trajectory, C...movement trajectory.

Claims (1)

[Scope of claim for utility model registration]
A discharge conductor having a passage for the molded product extruded onto the mortar attachment part of the rotary disk by a lower punch, and an air nozzle located inside the rotation locus and injecting air toward the outside of the rotary disk. An air supply source that supplies air to this air nozzle via a normally closed solenoid valve and a target value are set, and the molded product is determined by comparing this target value with the detection signal obtained during compression molding. The device is equipped with a determining device that determines whether the molded product is good or bad and opens the solenoid valve for a predetermined period of time when a defective product is determined. A defective product discharging device for a rotary powder compression molding machine, characterized in that a molded product contact portion protruding from the molded product is provided on the front side of the air nozzle when viewed from the moving direction of the molded product.