JPS5814080Y2 - Product sorting and discharge device for rotary powder compression molding machine - Google Patents

Description

[Detailed description of the invention] This invention determines whether the product manufactured in a rotary powder compression molding machine such as a tablet press has a predetermined weight or not, and detects whether defective products of abnormal weight are mixed in with good products. The present invention relates to a product sorting and discharging device for a rotary powder compression molding machine that prevents products from being taken out.

The weight of products manufactured with a rotary powder compression molding machine varies depending on the powder level of the powder feeder, density, etc., so it is difficult to keep the weight constant. It is common practice to manually measure samples and adjust the weight adjustment trajectory of the rotary powder compression molding machine based on the results.

Therefore, in recent years, devices have been provided that automatically measure the product weight during manufacturing and adjust the weight adjustment trajectory accordingly. This was usually done in one place on the rotary disk.

Therefore, even if automatic weight adjustment is possible, this device cannot handle abnormally heavy products (hereinafter referred to as defective products) that do not have the specified weight.

) is activated after the measurement of It is hoped that

In addition, in the ram-type powder compaction press machine, which has significantly lower production efficiency than the rotary powder compaction machine,
A product sorting device as disclosed in Japanese Patent No. 20351 is known.

This product sorting device measures the weight etc. with a weight measuring device such as an electronic micrometer during product distribution such as a conveyor that carries out the products discharged from the mortar mounting board, and transmits the error value to the electronic control machine. According to the command from this controller, Lee 1
- The structure is such that the product distribution section provided at the end of the product flow path is controlled to swing, and acceptable products and non-conforming products are stored separately.

However, weighing machines need to measure the weight of products one by one, and the currently known maximum capacity is limited to measuring approximately 150 products per minute.

However, the production capacity of rotary powder compression molding machines is much higher (currently, the maximum production rate is 2,700 pieces per minute).

) For example, in order to measure the weight of a high-speed rotary powder compression molding machine like this one, it is necessary to install multiple weight measuring devices as many as the number commensurate with the manufacturing capacity, and channels to guide the product to each of these devices separately. In addition, a product sorting section, product storage section, etc. are required.

Since weight measuring instruments are not inexpensive, the above-mentioned measures require enormous equipment costs and space.

Therefore, it is completely impractical and unrealistic to simply apply the product sorting device described in Japanese Patent Publication No. 49-20351 to a rotary powder compression molding machine. Until now, there has been no rotary powder compression molding machine that can automatically determine the type of powder and sort and discharge it.

This idea was devised based on the above circumstances, and its purpose is to reliably separate good products from abnormally heavy products even in a rotary powder compression molding machine with a particularly high production capacity. To provide an extremely practical device for discharging abnormally heavy products from a rotary powder compression molding machine, which enables direct discharging from a rotary disk.

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

In FIG. 1, 1 is a rotary powder compression molding machine (2 rotary disks), and a plurality of dies 2 are mounted at equal intervals on the same circumference of the peripheral edge of the rotary disk.

Powder material is supplied into the mortar 2 from a powder feeder (not shown), and the filling amount is appropriately adjusted by vertical movement of the weight adjustment track so that it remains constant. An upper frame 3 and a lower frame 4, which are arranged opposite to each other and can be freely inserted into and removed from the mortar hole, move in the axial direction so that their punch tips approach each other, thereby compressing the powder material. .

At the compression molding position, for example, an upper roll 5 and a lower roll 6 are arranged as pressurizing means, and when the upper and lower columns 3 and 4 pass through these, necessary compressive loads are applied to the upper and lower columns.

For example, a load-to-electricity converter 8 such as a load cell is provided in contact with the support 7 of the lower roll 6.

The output terminal of the converter 8 is connected to a shift register 11 and a machine stop counter 12 via an amplifier 9 and a setting device 10.

The setting device 10 sets, for example, an upper limit PH and a lower limit PL (see FIG. 3) of the allowable compressive load, and outputs an NG signal for a compressive load that is outside the set values.

Further, the machine stop counter 12 outputs a control signal to stop the operation of the rotary powder compression molding machine and turns off a switch of a drive circuit (not shown) when a set number of consecutive NG signals are received. It has become.

Furthermore, the output end of the shift register 11 is connected to a sorting member operating device, such as a solenoid 13, which reciprocates a movable scraper 14, which serves as a sorting member.

The movable scraper 14 is arranged in front of the fixed scraper 15 provided for taking out non-defective products, and is normally retracted to allow non-defective products to pass through without intersecting the rotation locus of the mill on the turntable 1. It is arranged so that it intersects with the mill rotation locus only occasionally.

The movable scraper 14 is arranged, for example, at a position where four punches have passed from the point where compression molding is performed.

Further, in this embodiment, a pair of detectors 16 and 17 are provided attached to a fixing bracket (not shown) at the compression molding position.

One of the detectors 16 is a member to be detected arranged at equal intervals on the rotary disk 1 (in this embodiment, the upper punch 3 or the lower punch 4 is used as the detected sound [material], so the rotating Compared to the case where protrusions and grooves as detected members are provided at equal intervals on the outer periphery of the board 1 in correspondence with the punches, no special processing is required and the structure is not complicated.

) is located near the moon.

One of the detectors 16 is used to extract the maximum value of the compressive load as a determination signal.

That is, the amount of electricity, such as the voltage, taken out to the load-electricity converter 8 during compression molding of powder changes as shown by the curve It is necessary to take out the maximum value of said curve, in other words the maximum value of the change in compressive load, for proportionalization and comparison with a set value, and one detector 16 is used for this purpose.

This detector 16 detects the passage of the upper punch 3, and from the output from this, the signal components of the output signal of the load-to-electricity converter 8 that overlap with the shaded range in FIG. 2 are used as judgment signals. It has become so.

Note that the detector 16 is set at a position to detect the member to be detected slightly before the compressive load reaches its maximum.

Incidentally, in order to install this detector 16, while actually performing compression molding by rotating the rotary disk 1 by hand, display the output waveform from the load-electrical converter 8 on the synchroscope, and, for example, perform compression molding. The waveforms from the detector 16 temporarily fixed at the molding position are simultaneously displayed on the synchroscope and superimposed, and while visually checking the synchroscope, the waveforms from the detector 16 are displayed so that these waveforms become as shown in FIG. The position is determined by finely adjusting the movement.

The other detector 17 detects members to be detected arranged at equal intervals on the rotary disk 1 (in this embodiment, the -L punch 3 or the lower punch 4 is used as the member to be detected).

) is used to determine when to operate the movable scraper 14.

The detection side number of this other detector 17 is the shift register 11
After the above judgment signal is input to the shift register 11, the next detection signal is sent to the shift register 11 as a shift signal to shift the input state to the next flip-flop before entering the shift register 11.

Furthermore, since the shift signal from the detector 17 is a signal for shifting the shift register 11, the shift signal is not synchronized with the input signal of one of the detectors 16, but is delayed.

In FIG. 3, A indicates a waveform indicating a compressive load, B indicates an NG signal, and C indicates a signal from the detector 17.

Further, in the operation panel shown in FIG. 4, 18 is a power switch, 19 is a power indicator light, 20 is an indicator light that lights up every time a signal is input from the setting device 10 to the shift register 11, and 2
1 is an indicator light that lights up each time a shift signal from the detector 17 is input to the shift register 11; 22 is a display unit that displays the setting of the number of NG signals; and 23 is a display lamp that lights up each time a shift signal is input from the detector 17 to the shift register 11; 23 is a display unit that displays the setting of the number of NG signals; 24 is a reset button for the indicator light 23, and 25 to 30 are provided corresponding to the number of passes of the pestle, and the lighting is sequentially switched each time the shift register 11 is shifted. For example, the indicator light 28 corresponds to four pestles that have passed from the compression molding point, and the indicator lights 26, 27, and 30 correspond to two pestles before and after the aforementioned pestle, and the indicator light 25 corresponds to the punch at the compression molding position.

In Fig. 3, 31 is a sorting start setting dial, and 32 is a sorting end setting dial.These are provided as necessary to ensure that defective products are discharged without being mixed in with non-defective products, even if some good products are sacrificed. These dials 31 and 32 set the number of products to be discharged by the movable scraper 14, and 33 is an indicator light that displays the sorting operation, and 34 is used to reset the electrical memory for sorting. This is the reset button.

According to this device, each time the powder material in the mortar 2 is compressed through the upper and lower rolls 5 and 6 at the compression molding position, the compression load detected by the load-electrical converter 8 is increased. The maximum value of the changes can be output as a judgment signal by one of the detectors 16, and this signal is amplified and sent to the setting device 10.
is manually input and compared with the set value here.

In this comparison, the maximum compressive load is the upper limit PH of the setting device 10.
If it is larger than the lower limit PL or smaller than the lower limit PL, an NG signal is output and input to the shift register 11 and the machine stop counter 12.

Therefore, each time such processing is performed one after another, the detector 17
The shift register 11 shifts the input state in response to a shift signal from the solenoid 13, and when the set shift is completed, an operating signal is given to the solenoid 13, causing it to operate.

Therefore, since the movable scraper 14 moves so as to intersect with the mill rotation locus, the scraper 14 discharges the defective products pushed onto the rotary disk 1.

For example, if the sorting start setting dial 31 is preset to the indicator light 26 in the setting state shown in FIG. When the setting dial 32 is set to the indicator light 29 in advance, even the product produced by the next pestle after the defective product is discharged.

After this discharge, the movable scraper 14 is on standby, and the non-defective products are discharged from the rotary disk 1 by the fixed scraper 15.

That is, only non-defective products having a set weight can be selected and discharged from the fixed scraper 15.

According to the product sorting and discharging device that sorts out good products and defective products and discharges them from the rotary disk 1 as described above, the detector 16 and the load-to-electrical converter 8 The maximum value of the change in compressive load, which is considered to be the weight of the product, is detected, and the detected value is compared with the setting device 10 to determine whether the product is good or defective. The weight will be automatically measured.

Therefore, even if the rotary powder compression molding machine has a low production capacity, or even one with a high production capacity, the weight is measured by the single weight determination system described above, so the production capacity does not depend on the production capacity as in the past. There is no need to prepare multiple compatible and expensive weight measuring devices.

Then, a sorting member operation mechanism 13 operates a movable scraper 14 by a shift register 11 operated by an NG signal from a setting device 10 and a signal from a detector 17 for detecting a pestle.
Since this is controlled, defective products can be directly discharged from the rotary disk 1.

Therefore, it is possible to separate non-defective products from defective products and discharge them from the rotary plate 1, without requiring multiple channels, sorting members, and product storage sections for multiple weight measuring devices as in the past. be.

In other words, with the device having the above configuration, even if it is a rotary powder compression molding machine with high production capacity, the structure can be simplified and the huge equipment cost and space required in the past can be avoided.
Good products and defective products can be reliably sorted and automatically discharged from the rotary plate 1.

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

For example, the load-electricity converter may be provided on the upper roll side,
In addition, if the pressurizing means is not a roll type but a liquid pressure, the pressure (
Hydraulic pressure) - can be detected using a voltage converter, etc., and can be installed anywhere in the pressurizing mechanism if necessary, and the load can be electrically extracted as an electrical quantity such as voltage. If so, it is not limited to load cells.

In the above embodiment, the movable scraper is used to take out defective products, and the stationary scraper is used to take out good products, but this relationship can also be reversed.

In other words, a movable scraper takes out good products, and a fixed scraper takes out defective products, but in this case, the movable scraper is always placed in contact with the top surface of the rotary plate and does not allow products to pass through, and takes out good products. When operated by the sorting member operating mechanism based on the , NG signal, the product is allowed to pass, and by this passage, defective products hit the fixed scraper and are taken out.

In addition, since this device sorts products based on their weight, even in the molding machine that manufactures dry-coated tablets, the weight of the product differs depending on whether or not there is a cored tablet, so it is difficult to detect and eliminate non-coated tablets. can also do this.

In addition, when implementing this invention, unless it is contrary to the gist of the invention, load-to-electrical converters, each detector, detected member,
It goes without saying that the specific structures, shapes, positions, etc. of the setting device, shift register, fixed scraper, sorting member operating mechanism, movable scraper, etc. are not limited to the one embodiment described above, and can be configured and implemented in various ways. .

The gist of the invention described above is the configuration described in the claims for the above-mentioned utility model registration.

Therefore, the product weight can be reliably measured by the detector, load-electrical converter, and setting device even when the manufacturing capacity of the rotary powder compression molding machine is low or high, and the product weight can be output based on the measurement results. The NG signal detected by the punch can be shifted to a shift register by another detector to control the sorting member operating mechanism, thereby operating the movable scraper disposed in front of the fixed scraper.

This series of systems has the effect of reliably sorting and discharging good and defective products from the rotary plate via a fixed scraper and a movable scraper. There is no need to provide a storage area, product storage area, etc., and therefore there is no need for huge equipment costs or space.
The sorting and discharge of products can be realized extremely easily, and its practical effects are great.

In addition, the movable scraper is operated at exactly the right timing after a certain period of time from the compression molding machine by using another detector for detecting the punch and a shift register, making it possible to eject only defective products, reducing the cost of powder materials. For expensive products,
This is particularly useful because good products are not discharged together with defective products.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, Fig. 1 is an explanatory diagram, Fig. 2 is a curve diagram showing changes in compressive load, and Fig. 3 shows the relationship between the waveform of the compressive load, the NG signal, and the shift signal. Explanatory diagram,
FIG. 4 is a front view of the operation panel. 1... Turntable, 2... Mortar, 3...
...Upper punch, 4...Lower punch, 5...Upper roll, 6...Lower roll, 8...Load-electrical converter, 9. ... Amplifier, 10 ... Setting device, 11 ... Shift register, 13 ...
・・Sorting member operation equipment (scraper), 14・・・・
- Sorting member (movable scraper), 15... fixed scraper, 16.17... detector.

Claims (1)

[Scope of Claim for Utility Model Registration] Mortars are installed at equal intervals on the same circumference of a rotary disk, and the powder material supplied to the mortars is transferred to the lower pestle forming the bottom of the mortars by means of pressurizing means. , and a rotary powder compression molding machine that performs compression molding via an upper punch inserted into the molding position at the compression molding position, the product sorting and discharging device comprising the following requirements A to H: . A: A load-electrical converter that is installed in a pressurizing mechanism and electrically extracts changes in compressive load during compression molding. B: A fixed sensor that detects the passage of detected members arranged at equal intervals on the rotary disk, and outputs the maximum value of the change in compressive load detected by the load electrical converter as a judgment signal based on this detection signal. Detector. A setting device that sets a C limit value and receives the above judgment signal and outputs an NG signal when this signal is equal to the limit value. D A shift register into which the NG signal output from the above setting value is input. E. Another fixed detector that detects the passage of detected members arranged at equal intervals on the rotary disk and outputs this detection signal as a shift signal to the shift register. F. A sorting member operating mechanism to which an operating signal is given upon completion of the shift of the shift register. G A fixed scraper installed on the rotary disk for removing good or defective products. H A movable scraper disposed on the rotary disk in front of the fixed scraper and moved by the sorting member operating mechanism to remove defective or good products from the molded products.