JPS598876Y2 - Product sorting device for rotary powder compression molding machine - Google Patents

Description

[Detailed description of the device] This device uses a rotary powder compaction machine, such as a tablet press, which compresses powder to form tablets with a constant compression or die load, so that the product manufactured is The present invention relates to a product sorting device for a rotary powder compaction machine that determines whether or not the weight is high to prevent defective products from being taken out mixed with good products.

The weight of products produced with a rotary powder compaction machine varies depending on the powder level, density, etc. of the powder feeder, so it is difficult to keep the weight constant. Usually, the weight adjustment trajectory of a rotary powder compaction machine is adjusted based on the results of manual measurements.

Recently, a device has been provided that automatically measures the weight of the product during manufacturing and adjusts the weight adjustment trajectory accordingly. Therefore, it was usually done in one place on the mortar mounting board.

Therefore, even if the weight is automatically adjusted, this device operates after measuring defective products that do not have a specified weight, so there is a disadvantage that it cannot prevent defective products that do not have a specified weight from being mixed into the products being taken out. Therefore, it is desired to avoid such inconvenience and to prevent defective products from being mixed in with the good products that are taken out.

This invention was devised based on the above-mentioned conventional circumstances with the aim of providing a product sorting device for a rotary powder compaction type machine that satisfies the requirements.Hereinafter, one embodiment of this invention is shown in the drawings. I will explain about it.

1 in the figure is the rotating mortar mounting plate of the rotary powder compaction machine.
A plurality of dies 2 are attached at equal intervals on the same circumference of this peripheral portion.

Powder material is supplied into the mortar 2 from a powder feeder 3 disposed on the mortar mounting plate 1, and after the filling amount is determined by a weight adjustment track 4 that can be adjusted vertically, it is moved to a compression or molding position. At this time, the upper punch 5 and the lower punch 6 are moved in the axial direction so that their tips approach each other, thereby compression molding the powder material.

For example, an upper roll 7 and a lower roll 8 are disposed as pressure means at the compression mold position, and when the upper and lower punches 5 and 6 pass through these, a predetermined compression load is applied to the powder in the mortar 2. It has become.

The support body 8a of the lower roll 8 is housed in a lower guide groove 9a provided in a fixed frame 9 of a rotary powder compacting machine so as to be movable up and down, and is also supported on an elevating shaft 10.

The lifting shaft 10 has a threaded groove in its lower part, and an inner peripheral gear portion of a driven gear 11 is engaged with this threaded groove.

A driving gear 12 is meshed with the outer peripheral gear portion of the driven gear 11, and by rotating this gear 12 manually or automatically, the lower roll 8 is adjusted up and down to adjust the compression or mold load to a predetermined value. It is designed to be determined.

Further, the support body 7a of the upper roll 7 is also housed in an upper guide groove 9b provided in the fixed frame 9 so as to be movable up and down.

A hydraulic cylinder device 13 is attached to the fixed frame 9 facing the guide groove 9b, and a piston 1 provided therein is mounted on the fixed frame 9.
The lower end of the support member 4 protrudes into the upper guide groove 9b and abuts against the upper end of the support 7a.

A constant hydraulic pressure is always introduced into the hydraulic cylinder device 13 via a hydraulic piping 16 having a check valve 15 in the middle thereof, and a relief valve 13a is connected thereto.

Note that 9C is a stopper that limits the lowering of the support 7a.

An iron core 17 is attached to the support body 7a, and its upper end is connected to a detection coil 18 supported by a fixed frame 9.
A power source 19 and an ammeter 20 are connected in parallel to both ends of the coil 18.

That is, these constitute a displacement-to-electrical converter 21 that converts displacement into an amount of electricity, but it goes without saying that any other type of converter may be used.

This converter 21 outputs the amount of electricity detected by the ammeter 20, and is connected to a shift register 25 and a machine stop counter 26 via an amplifier 22, a peak value hold circuit 23, and a setting device 24. .

The setting device 24 sets the upper and lower limits of the displacement amount of the upper roll 7 corresponding to the allowable thickness of the product, and issues an NG signal for the displacement amount (in other words, the thickness of the product) that is outside the set limits. It is something.

Then, the machine stop counter 26 outputs a control signal to stop the operation of the rotary powder compaction type machine when the set number of consecutive NG signals is input, and turns off the switch of the drive circuit (not shown). It looks like this.

Furthermore, the output end of the shift register 25 is connected to a sorting member operating device, such as a solenoid 27, which operates a sorting member such as a movable scraper 28.
It is designed to move back and forth.

This scraper 28 is disposed in front of a fixed scraper 29 provided for taking out non-defective products, and is normally on standby to allow good crystals to pass without intersecting the rotation locus of the mortar on the mortar mounting board 1. It is moved so as to intersect the mill rotation trajectory only occasionally.

The movable scraper 28 is disposed at a position where, for example, four punches have passed, counting from the compression mold position in accordance with the number of shifts in the shift register 25.

A pair of detectors 31 and 32 are connected to the upper punch via a bracket (not shown) at the compression position. 5 or the lower punch 6.

One of the detectors 31 is for detecting the time when the displacement of the upper punch 5 reaches its maximum, and its output is input to the peak value hold circuit 23, which changes the position of the upper roll 7 of the upper punch 5. The highest value of the detected quantity of electricity, which changes as time passes, is taken out and output to the setting dial 24.

The other detector 32 detects the number of passes of the pestle in order to determine the operation timing of the movable scraper 29, and the signal is transmitted to the shift register 25 after a manual signal is input from the setting device 24 to the next pestle. It is output to the shift register 25 as a shift signal to shift the input state to the next flip-flop before the input is received.

According to this device, as the mortar mounting plate 1 rotates, the powder in the mortar 2 is compressed through the upper and lower rolls 7 and 8 at the compression state position, but in this case, the lower roll 8 does not escape downward, and the upper roll 7 applies a compressive load to the upper punch 5 while escaping upward.

By the way, when the upper roll 7 is displaced upward, the piston 14
is pushed up and the hydraulic pressure inside the hydraulic cylinder device 13 increases, but once it reaches a preset predetermined pressure, pressure beyond that is released by the action of the relief valve 13a.
The load applied to the powder in the mortar 2 is kept constant, so the thickness of the product varies depending on the amount of powder in the mortar 2.

However, since the thickness of this product is detected by the ammeter 20 via the displacement of the upper roll 7 and the size of the insertion dimension of the iron core 17 into the detection coil 18 in the electric transducer 21, this detection signal is amplified. After that, the maximum value of the detection signal is input to the setter 24 via the peak value hold circuit 23, where it is compared with a set value.

In this comparison, if the maximum value of the detection signal is outside the set band, an NG signal is sent from the setter 24 to the shift register 2.
5 and the machine stop counter 26.

Each time such processing from detection to determination is performed one after another, a shift signal from the detector 32 is used to shift the shift register 25.
When the input state of is shifted and the set shift is completed, an operation signal is outputted to the solenoid 27 from the register.

Therefore, the solenoid 27 operates and the movable scraper 2
8 intersects with the rotation locus of the mortar, and the mortar mounting board 1
The defective products pushed out above are taken out.

Furthermore, depending on the setting of the movement time of the solenoid 27, the mortar mounting board 1
If the rotation is fast, start taking out the product at least one punch position before the defective product, and continue to take out the product at least one punch position after the defective product to avoid failure in taking out the defective product. If the speed is low, only the defective product in question is taken out.

After this removal, the movable scraper 28 automatically returns to the standby state, so that good products having a predetermined weight and thickness are removed by the fixed scraper 29.

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

For example, as the selection member operating device, various types such as a servo motor can be used in addition to a solenoid.

When using a solenoid in the above-mentioned operating equipment, there is a limit to the operating speed of the device using the solenoid, so in order to implement it in a product that is manufactured at a rotation speed that exceeds that limit, it is necessary to use a shift register and a solenoid. A timer may be provided in between to extend the solenoid operating time to remove, for example, a few dozen products, including defective products, and this group exclusion scheme may address speed.

Furthermore, in the above embodiment, the movable scraper was used to take out defective products, and the fixed scraper was used to take out good products.
It can also be implemented by reversing this relationship.

Furthermore, various selection members other than scrapers are conceivable.

For example, it is possible to divide the take-out passage continuous with the fixed scraper into two parts, and rotatably provide a route switching valve, that is, a sorting member, at the introduction part of the take-out route, and to select and take out good products and defective products by switching the route.

Similarly, a part of the bottom of the extraction path may be made openable and closable, and the sorting and extraction may be performed by opening and closing this opening/closing bottom plate, that is, the sorting member, and furthermore, a rotatable tube body, that is, the sorting member, may be provided at the end of the extraction path. Then, by the rotation, good products and defective products may be guided in different directions to be sorted and taken out.

As explained above, this device can automatically determine whether or not the product has a predetermined weight when compacting or molding powder with a constant molding load, and can prevent good products from being taken out. Products can be taken out without any defective products not having a predetermined weight or thickness being mixed into the product.

[Brief explanation of drawings]

The figure is an explanatory diagram showing an embodiment of this invention. 1... Mortar mounting board, 2... Mortar, 5... Upper punch, 6...
・Lower punch, 7... Upper roll, 7a... Support, 8...
- Lower roll, 8a...Support, 13...Cylinder device, 13a...Relief valve, 21...Displacement-electric converter, 22...Amplifier, 23...Peak value hold circuit , 24... Setting device, 25... Shift register, 27... Sorting member operating device (solenoid), 28...
・Two sorting members (movable scrapers) ・Fixed scraper 31. 32...Detector.

Claims (1)

[Claims for Utility Model Registration] A support supporting the lower roll is provided so as to be adjustable up and down, and a support supporting the upper roll is provided facing above and movable up and down. IJ-
Rotation that compresses the powder by pressing downward with a hydraulic cylinder device connected to a flap valve and applying a compression load while the upper roll escapes upward during compression molding, keeping the compression molding load constant. In the type powder compaction machine, there is a displacement-electrical converter that converts the displacement of the upper roll during compression into an electric quantity and takes it out, and a rod installed at the compression die position that converts the load change of the rod that passes between the upper and lower rolls. A peak value is connected to the output end of the displacement electric converter and holds the maximum value of the input from the displacement electric converter. a hold circuit; a setting device connected to the output end of the peak value hold circuit and configured to set a limit value and output an NG signal when the maximum value inputted from the peak value hold circuit is outside the limit value; A shift register is connected to the output end of this setting device and operates in response to a signal from another detector installed at the compression die position to detect the passage of the rod. The present invention is characterized by comprising a sorting member operating device that receives signals emitted from the register, and a sorting member that is operated by the operating device and separates good and defective products from molded products and takes them out. A product sorting device for a rotary powder compaction machine.