JPH01118399A - Stamp breakage metal detecting device in powder compression forming machine - Google Patents

Abstract

PURPOSE:To prevent the mass production of a deformed product by providing a stamp breakage metal detecting device and deciding a metal foreign matter as the stamp breakage metal in case of the peak value of the detection signal being more than the specified and the voltage more than the specified continuing by exceeding more than a fixed time. CONSTITUTION:In a stamp breakage detecting device 11 the detection signal amplified by an amplifier circuit 16 is inputted to a foreign matter large level deciding circuit 17 and foreign matter small level deciding circuit 18 and compared with a preinputted set level. In the foreign matter large level deciding circuit 17 whether it is more than the level or not is decided and if it is found more than the level the metal foreign matter is decided to be large and the detection signal is outputted to a stamp breakage deciding circuit 19. The circuit 19 decides whether it is the stamp breakage metal or not by a foreign matter large level exceeding time collating circuit. If decided as the stamp breakage metal, a signal is transmitted to a rejection damper setting circuit 20 to release a rejection damper 8 and to reject the table mixed with the stamp breakage metal. A signal is simultaneously transmitted to a tablet machine stopping circuit 21 to stop a tablet machine 5 and a foreign matter size counter 22 and buzzer 23 are actuated.

Description

[Detailed description of the invention] Good rice five A scales! The present invention relates to a device for detecting missing metal in a powder compression molding machine used as a tableting machine, and more specifically, when a chip occurs in the upper punch and/or lower punch of the powder compression molding machine, the missing metal in the punch is immediately detected. This makes it possible to detect it.

Traditionally, a tablet machine consisting of the above-mentioned powder compression molding machine was used.
When producing tablets 1 with sloped or curved peripheral edges 1a on both the upper and lower surfaces as shown in the figure, as shown in Figure 2, the tip of the punch 2 used in the tablet machine is A molded portion 3 is provided that is concave toward the inside. Since the peripheral edge 4 of the molded part 3 is very sharp, it is easy to crack during compression molding, and the cracks tend to cause chipping (so-called surface chipping) of the edge 4 shown at A in FIG. 3.

Tablets formed using punches with the above-mentioned surface chips will not have the specified shape and will be rejected as irregularly shaped products. If the key-pressing machine is not stopped immediately when this occurs, a large amount of odd-shaped products will be produced that will be rejected.

In this type of tablet production line, in addition to the missing metal caused by missing punches, metal foreign matter may be mixed in from equipment parts etc. in each line. is installed, and when a metal foreign object is mixed in the tablet, an exclusion damper is operated to remove the tablet containing the metal foreign object. On the other hand, the above-mentioned missing punches are discovered when defects are discovered through periodic external inspection of non-defective locks, and as a result, it takes a long time from the occurrence of a missing punch to the stoppage of the key-pressing machine, resulting in a large amount of This results in the production of oddly shaped products.

Purpose of the Invention The present invention has been made in view of the above-mentioned conventional problems.
It utilizes a conventionally installed metal detection sensor and a metal detection/removal machine that detects and removes mixed metals by receiving signals from the sensor, and detects punch chips by distinguishing them from other mixed metals based on the detection signal. A missing punch detection device is installed, and if a missing punch occurs, it is detected immediately after the tablet is pressed and the keying machine is immediately stopped, thereby preventing the mass production of irregularly shaped products.
By using the conventionally installed metal foreign object detector as a chipped punch detector, the increase in cost can be suppressed and the installation space can be saved.

Composition of the Invention In order to achieve the above-mentioned object, the present invention provides a powder compression molding machine in which an upper punch and a lower punch move up and down, and these upper and lower punches compress powder to form tablets, etc. In the product transport path, voltage is induced in two receiving coils by high-frequency magnetic lines from an oscillating coil and balanced, and when a metal passes between the oscillating coil and the receiving coil, a detection signal is generated depending on the size of the metal. A sensor for detecting mixed metal is installed, and the sensor is connected to a metal detection and removal machine to output a detection signal, and the metal detection and removal machine includes an amplification circuit for amplifying the detection signal, and a A missing punch detection device is provided with a circuit that determines the presence of mixed metal according to the level of the input detection signal, a circuit that operates an exclusion damper to eliminate mixed metal, etc., and a missing punch detection device connected to the amplifier circuit of the metal detection and removal machine. The missing punch detecting device is configured to detect when the peak value of the detection signal inputted from the amplifier circuit of the metal detection and removal machine is equal to or higher than a predetermined value, and when a voltage equal to or higher than the predetermined value continues for a predetermined period of time or more. The present invention is characterized by comprising a circuit that determines that the metal foreign object is a missing metal when the foreign object is a missing metal, a circuit that sends an opening operation signal to the exclusion damper, and a circuit that sends a stop signal to the key press when it is determined that the foreign object is a missing metal. The present invention provides a missing metal detection device for a powder compression molding machine.

As described above, in the present invention, a missing punch detection device is added to the conventional sensor and metal detection/removal machine, and missing metal is judged separately from other mixed metals. Without providing a sensor control unit, it is possible to detect the missing metal by distinguishing it from other mixed metals. If the detection device determines that the punch is missing, the tableting machine consisting of a powder compression molding machine is immediately stopped, thereby preventing mass production of irregularly shaped products.

EXAMPLES Hereinafter, the present invention will be explained in detail with reference to examples shown in the drawings.

In FIG. 4, 5 is a tablet press, 6 is a chute for taking out the tablets formed by the tablet press 5, 7 is a sensor for detecting mixed metal inserted in the middle of the chute 6, and 8 is a chute 6. An exclusion damper installed at the tip outlet, 9 an exclusion receiver installed at the bottom of the exclusion damper 8, IO a tablet receiver, 11 a punch defect detection device, 12 the chute 6 and a sensor 7 for detecting mixed metal, This is a pedestal on which a missing punch detection device 11 is mounted, and inside the pedestal 12 there is a metal detection/removal device that receives a detection signal from the sensor 7 for detecting mixed metal and controls the operation of the removal damper 8 and also issues an alarm such as a buzzer. It houses aircraft 13.

The metal detection and removal machine 13 is connected to the missing punch detecting device 11, and is configured to amplify the detection signal inputted from the sensor 77 and output it to the missing punch detecting device.

The structure of the tableting machine 5 is a well-known rotary powder compression molding machine, and the shapes of the tips of the upper and lower punches used in the tableting machine 5 are as shown in FIG. 2, and as shown in FIG. The tablet l shown is being molded. As shown in FIG. 5, the sensor 7 for detecting mixed metal is arranged with one transmitting coil P and two receiving coils S1 and St, and the high-frequency magnetic lines of force coming out from the transmitting coil P are transmitted to the receiving coils S, S, and S. receive it and induce a voltage,
A balance between Sl and S is used, and the tablet I is passed between the oscillating coil P and the receiving coils S and SS. Between the above oscillating coil P and receiving coils S and SS, there is a tablet! When a foreign metal object and/or a metal column passes through, the balance between Sl and S is disrupted due to deformation of the magnetic path or eddy current, and a potential difference occurs. As shown in FIG. 6, a detection signal consisting of a potential difference generated when a metal foreign object passes through the reception coil balance circuit 15 of the metal detection and removal device 13 connected to the sensor 7 is amplified by the connected amplifier circuit 16, and then the level is determined. It is output to the circuit 25. Further, the detection signal amplified by the amplifier circuit 16 of the metal detection and removal machine is output to the connected pillar detection device 11.

In the pillar insertion detection device 11, the detection signal amplified by the amplifier circuit 16 is inputted to the foreign matter large level determination circuit 17 and the foreign matter small level determination circuit 18, and these level determination circuits 17 and 1
It is compared with the setting level input in the previous section 8.

In this embodiment, the above setting level is 5US304
A small metal piece of φ0, 3 mm consisting of a test piece of
φI made of large metal piece of φ0.5mm and 5KS-2
It is set based on the results of an experiment using a columnar sample of X2+nn+. The experimental results for the above three types of metal pieces are shown in Figure 7, and the detection signals of these metal pieces are shown in Figure 7 (
A) shows the detection signal of the small metal piece, (B) the large metal piece, and (C) the pillar-filled sample, and the detection signal peaks at 14V. FIG. 8 shows the signal of the metal pillar in detail.

As is clear from these drawings, in the case of a small metal piece (a), the waveform peak value vp of the detection signal is about 4V, and for the large metal piece (b), the peak value Vp reaches a level of about 14V and exceeds 8V. The time is 15m5. In the case of the columnar sample (c), the peak value exceeds 14V in both cases, and the time it takes to exceed 8V is 40ms and 30ms.

It was 25m5.

Based on the above experimental results, the determination level based on the detection signal is set as follows. That is, Vp is the peak value of the waveform detection signal, VR-1 is 3VS VR-2 is 8V.

When t is the time exceeding VR-2 above, and T is an arbitrarily set time, ■Vr-1 (3V) < Vp < vR-2 (8v)...Small metal foreign matter ■Vr-1 (3V) < Vp >VR-2 (8V), t(
15ms)<T(20ms)...Small metal foreign matter ■Vr-1 (3V)<Vp>VR-2(8V), t(2
5ms)>T(20ms) ... Based on the result when a metal foreign object passes, in the block diagram of FIG. A determination is made that there is a metal foreign object in the hole, and a detection signal is output to the next pillar insertion determination circuit 19. The pillar entry determination circuit 19 is a foreign matter large level excess time checking circuit, and is configured to determine whether or not the pillar is metal.

When it is determined that the metal is a pillar, a signal is sent to the exclusion damper set circuit 20 to open the rejection damper 8 and keep it open, thereby preventing the detected pillar metal from entering the rejection receptor 9 from the chute 6. Eliminate tablets. moreover,
Simultaneously with the output to the exclusion damper set circuit 20, a signal is sent to the tablet press stop circuit 21 to stop the tablet press 5 and operate the foreign object hole counter 22 and buzzer 23.

Furthermore, the detection signal input to the small foreign object level determination circuit 18 is used to determine whether or not there is a small metal foreign object based on the determination levels of (1) and (2) above. I'm trying to get it to work.

On the other hand, on the mixed metal detection block X side of the metal detection and removal device 13, the amplified detection signal is sent to the level determination circuit
5, and if the level determination circuit 25 determines that it is a metal foreign object that should be eliminated, the rejection damper timer 26
The exclusion damper 8 is operated to open for a certain period of time, and the exclusion counter 27 and the buzzer 28 are also operated.

As described above, according to the present device, the metal in the pillar can be detected by the metal in the pillar with the detection device 11 installed immediately after the lock is pressed, and the key pressing machine 5 is immediately stopped when the metal in the pillar is detected. It is possible to prevent a large number of tablets from being molded with a chipped punch.

Effects of the Invention As is clear from the above explanation, the pillar detection device according to the present invention utilizes a conventional mixed metal detection device, and the waveform peak value of the detection signal generated when detecting a metal foreign object is If the voltage exceeds a predetermined value and continues for a certain period of time, which would not be exceeded in the case of a metal foreign object other than pillar metal, the detected mixed metal is classified as pillar metal. If it is determined that there is metal in the pillar, the key press is immediately stopped. Therefore, it is possible to quickly prevent compression molding of powder using a punch with a chipped surface, and it is possible to prevent mass production of irregularly shaped products due to a delay in finding the punch and a delay in stopping the tablet press. In addition, as the pillar metal detection device,
By using the conventionally installed sensors and metal detection/removal machines, we simply added a pillar detection device that determines whether or not there is metal in the pillar based on the detection signal generated by these conventional devices. This has various advantages, such as not increasing the height of the lift and not taking up much space for installation.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a tablet molded by the powder compression molding machine according to the present invention, Fig. 2 is a front view showing the tip of the punch used in the powder compression molding machine, and Fig. 3 is a front view showing the tablet in the column-filled state. 4 is a front view of a tablet making machine showing an embodiment of the present invention, and FIG. 5 is a schematic diagram showing a mixed metal detection device 7 and a pillar metal detection device It.
6 is a block diagram of the detection device according to the present invention, FIG. 7 is a diagram showing the magnitude of the detection signal of mixed metal foreign matter and pillar metal, and FIG. 8 is a diagram showing the detection signal of pillar metal. FIG. 3 is a diagram showing signals in detail; 1. Tablet, 2. Punch, 4. Edge, 5. Tablet press, 6. Chute, 7. Sensor for detecting mixed metal, 8. Exclusion damper, 9. Exclusion receptor, 10 ... Tablet receiver is a container, 11.. Pillar detection device, 12.. Stand, 13.. Metal detection and removal machine, 15.. Receiving coil balance circuit, 16.. Amplification circuit, 17.. Foreign matter level determination circuit. , 18... Foreign matter small level judgment circuit, 19... Pillar insertion judgment circuit, 21... Tablet press stop circuit. Patent applicant Takeda Pharmaceutical Co., Ltd. Representative patent attorney Blue and white Two idiots groan 5 Figure 4 Calyx 5s 7th ward 8s 1111-(rn s 1

Claims (1)

[Claims] (1) In a powder compression molding machine in which an upper punch and a lower punch move up and down, and the powder is compressed between these upper and lower punches to form tablets, etc., the molded product conveyance path immediately after molding is set according to the size of the metal. A metal detection sensor that generates a detection signal is installed, and the metal detection sensor is connected to a metal detection and removal machine to output the detection signal, and the metal detection and removal machine includes an amplifier circuit that amplifies the detection signal, A circuit for detecting mixed metal based on the level of a detection signal input from an amplifier circuit is provided, and a chip chip detection device connected to the amplifier circuit of the metal detection and removal machine is provided, and the punch chip chip detection device includes a chip chip detection device that is connected to the amplifier circuit of the metal detection and removal machine. The metal foreign object is characterized by being equipped with a circuit that determines that the metal foreign object is a missing metal if the peak value of the detection signal from the metal foreign object is a predetermined value or more and the voltage of the predetermined value or more continues for a certain period of time or more. A device for detecting missing metal in a punch in a powder compression molding machine.