JPH11333599A - Tablet making machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a formed article from being left out of inspection, and to improve the yield by detecting a defective article on the real time basis. SOLUTION: A tablet making machine to obtain a specified formed article A by moving a movable rod 3 to a fixed rod 1 to press a work material between the rods, is provided with a linear gauge 5 to measure the distance between the movable rod 3 and the fixed rod 1 when the pressing is completed as the height of the formed article A, and an display 7 to display the result of measurement of the linear gauge 5 and to output the result of comparison of the result of measurement with the upper and lower limits of the preset height of the formed article to a control panel 6. The control panel 6 controls the pressing process so as to be interrupted when the signal to indicate an abnormality is inputted from the indicator 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tablet press for performing press molding.

[0002]

2. Description of the Related Art A horizontal tableting machine comprises a fixed punch, a filling device for quantitatively filling a molding material into a molding space formed by the fixed punch and a die, and a molding space filled with the molding material. It is mainly composed of a movable punch and the like that is pressed into the inside and pressurizes the material to be molded.

In order to obtain a molded product having the required shape and weight using such a tableting machine, it is necessary to strictly control the filling amount of the material to be molded and the pressing force of the movable punch. However, parameters such as the filling amount of the material to be molded and the pressing force of the movable punch include many variations in an actual process, and there is no guarantee that a molded product having a desired shape and weight is always obtained.

[0004] In particular, the dimension of the molded product in the pressing direction is determined by the filling amount of the material to be molded and the pressing force of the movable punch, and is the maximum point for determining the quality of the molded product. That is, if the filling amount of the molding material is larger than the specified value or the pressing force of the movable punch is smaller than the specified value, the movable punch stops before the position where it should have reached the end of pressurization, Conversely, if the filling amount of the molding material is less than the specified value or the pressing force of the movable punch is larger than the specified value, the movable punch stops at a position deeper than it should have reached at the end of pressurization. This causes molding failure.

[0005]

Under such circumstances, inspection of molded products before shipment is considered as an essential step. However, the inspection is generally performed artificially after the completion of the molding process. In this case, there is a problem that an inspection error or an omission of the inspection occurs to a considerable extent, and the shipment of defective products cannot be completely stopped. Further, it is difficult to detect molding defects at an early stage, and there is also a problem that a large amount of defective products are generated without knowing, resulting in a significant decrease in yield.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is possible to prevent the omission of inspection of a molded product and improve the yield by detecting a defective molded product in real time. It aims to provide a tableting machine.

[0007]

In order to achieve the above object, a tableting machine of the present invention presses a molding material between the punches by moving a movable punch toward a fixed punch. Means for measuring the distance between the movable punch and the fixed punch at the end of pressurization, and means for judging the quality of the molded article based on the result of the measurement in a tableting machine for obtaining a predetermined molded article. And characterized in that:

According to the present invention, the distance between the movable punch and the fixed punch at the end of pressurization is measured as the dimension of the molded product in the pressing direction, that is, the height, and the quality of the molded product is determined from the measurement result. Since such measurement and determination are performed for each single pressure molding, inspection omission of the molded article is eliminated, and when a molding defect is determined, the molding process can be immediately interrupted. The yield is improved.

Further, the tableting machine according to the present invention is a tableting machine for obtaining a predetermined molded product by moving a movable punch toward a fixed punch to press a material to be molded between the punches. Means for measuring the distance between the movable punch and the fixed punch at the end of pressurization, means for measuring the weight of the molded product, and the quality of the molded product based on the measured distance and weight. Determining means.

[0010] According to the present invention, it is possible to perform a more accurate inspection of a molded product by determining the quality based on the height and weight of the molded product.

[0011]

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

FIG. 1 is a view showing a configuration of a horizontal tablet press according to an embodiment of the present invention.

As shown in FIG. 1, this horizontal tableting machine comprises a fixed punch 1 and a molding space formed by the fixed punch 1 and a die 2 with a fixed amount of a material to be formed (powder or granule). A filling device (not shown), a movable punch 3 pressed into the molding space filled with the molding material to press the molding material, a contact plate 4 integrally attached to the movable punch 3, The distance W between the contact plate 4 of the movable punch 3 and the fixed punch 1
The linear gauge 5 for measuring the height of the linear gauge 5 and the measurement result of the linear gauge 5 are displayed, and the result of comparison between the measurement result and the preset upper and lower limits of the height of the molded product is output to the control panel 6. The display 7 is provided.

Further, each part of the horizontal tablet press will be described.

The movable punch 3 is configured to move between an initial position P0 and an arbitrary pressing end position P1 by a pressure from a pressing device (not shown).

The tip of the gauge bar 5a of the linear gauge 5 is
The movable punch 3 is always in contact with a contact plate 4 integrally attached to the movable punch 3, and is configured so as to be pressed by the movable punch 3 when the movable punch 3 moves forward and to retreat. The linear gauge 5 uses a signal indicating the distance W of the tip end position P1 of the retreated gauge bar 5a from the reference position Pb as a signal indicating the height of the molded product.
Output to Here, the reference position Pb of the linear gauge 5 refers to, for example, a position when the tip of the gauge bar 5a is at the tip of the fixed punch 1. However, in this case, it is assumed that the position of the surface of the contact plate 4 and the position of the distal end surface of the movable punch 3 match.

The indicator 7 has a function of arbitrarily setting the upper and lower limits of the height of the molded article, and compares the measured value obtained by the linear gauge 5 with the upper and lower limits to determine the upper and lower limits. If the value exceeds the value, an H (High) NG signal indicating an abnormality is output.
A GO signal indicating normal if the measured value is within the range of the upper and lower limits, and L indicating abnormal if the measured value is below the lower limit.
(Low) An NG signal is output to the control panel 6.

The control panel 6 controls the entire tableting machine,
For example, control of the pressing force of the movable punch 3, control of the filling device, and control based on a signal output from the display 7 are performed. In the present embodiment, as the control based on the signal output from the display 7, when the NG signal is output, the operation of the entire tableting machine is forcibly stopped.

Next, the operation of the thus configured horizontal tablet press will be described.

First, necessary parameters such as the upper and lower limits of the measurement result of the linear gauge 5, the pressing force of the movable punch 3, the filling amount of the molding material, and the like are set on the display 7 and the control panel 6, and then fixed. A material to be molded is fixedly filled in a molding space formed by the punch 1 and the die 2, and the movable punch 3 is moved (advanced) at a predetermined pressure toward the molding space to perform pressure molding. The position P1 of the movable punch 3 at the end of pressurization is determined by the actual filling amount of the molding material, the pressing force of the movable punch 3, and the like. That is, if the actual filling amount of the molding material is larger than the specified value or the pressing force is smaller than the specified value, the movable punch 3 stops short of the position to be originally reached, and conversely, the actual If the filling amount is less than the specified value or if the pressing force is larger than the specified value, the movable punch 3 stops at a position deeper than the position where the punch should originally reach.

Then, the distance W from the position P1 at the end of pressurization of the movable punch 3 to the fixed punch 1 is measured by the contact plate 4 attached to the movable punch 3 and the linear gauge 5, and the measurement result is displayed. Output to the container 7. Since the distance W from the position P1 at the end of pressurization of the movable punch 3 to the fixed punch 1 is the height of the molded product A itself, the display 7 shows the measurement result and the height of the molded product set in advance. By comparing with the lower limit value, the quality of the actual height of the molded article A can be determined.

The judgment result obtained by the display 7 is immediately given to the control panel 6. When the control panel 6 receives a GO signal indicating normality from the display 7, the control panel 6 controls so as to start the next pressure forming step, and an H (High) NG signal or an L (Low) NG signal indicating an abnormality. Is input, control is performed so as to interrupt the pressure molding process.

As described above, according to the present embodiment, the height of the molded article is measured in the pressure molding step, and when the measurement result indicates an abnormal value, for example, the operation of the tableting machine is forcibly interrupted. This can minimize the occurrence of defective molded products. In addition, the omission of inspection of the height of the molded product is eliminated, and the risk of defective products being shipped is largely eliminated.
Next, another embodiment of the present invention will be described with reference to FIG. In the figure, a fixed punch 1, a die 2, a filling device,
The configurations of the movable punch 3, the contact plate 4, the linear gauge 5, and the like are the same as those in the embodiment of FIG.

The horizontal tableting machine of the present embodiment has the same configuration as the horizontal tableting machine shown in FIG. 1 except that a weight measuring device 11 for measuring the weight of the molded article A and an output from the weight measuring device 11 are provided. A determination device 12 for determining the quality of the molded product A based on a signal indicating the molded product weight and a signal indicating the height of the molded product from the display 7, and a non-defective product and a defective product determined by the determination device 12. A sorting machine 13 for sorting and a printer 14 for printing a judgment result for each molded article for recording and storage are added.

The determination device 12 is, as in the above embodiment,
The quality of the molded product A is determined from the height dimension, and the determination result is output to the control panel 6 and stored. When a defect is determined, the operation of the tablet press is forcibly interrupted by the control panel 6 as in the above embodiment.

Thereafter, the weight of the molded product A determined to be non-defective by the determination based on the height dimension of the molded product is measured by the weight measuring device 11. The weight measurement result is input to the determination device 12. The determination device 12 determines the specific gravity (filling rate) of the molded product A from the height and weight of the molded product A and other initial set values (diameter and the like of the molded product), and the determined specific gravity value is set in advance. Check if it is within the lower limit. If the obtained specific gravity value is within the range of the preset upper and lower limit values, the molded product is determined to be good, and if it is out of the range, it is determined to be defective. Then, the judgment result is output to the sorting machine 13.

The sorting machine 13 automatically removes the defective molded product A from the process based on the quality determination result based on the height of the molded product A and the quality determination result based on the specific gravity.

The quality judgment result of the molded article A obtained by the judgment device 12 is output as a printed matter by the printer 14 for record keeping.

As described above, according to the present embodiment, a defective molded product can be more accurately detected by judging the quality of the molded product not only from the height dimension but also from the specific gravity.
It is possible to further reduce the probability that defective molded products with no inspection are shipped.

[0030]

As described above, according to the tablet press of the present invention, the distance between the movable punch and the fixed punch at the end of pressurization is measured as the dimension in the press direction of the molded product, that is, the height. By judging the quality of the molded article from the measurement result, the inspection omission of the molded article is eliminated, and the molding process can be immediately interrupted when a molding defect is determined, so that the yield is improved. . In addition, by determining the quality based on the height and weight of the molded product, it is possible to perform more accurate inspection of the molded product.

[Brief description of the drawings]

FIG. 1 is a view showing a configuration of a horizontal tablet press which is an embodiment of the present invention.

FIG. 2 is a view showing a configuration of a horizontal tablet press which is another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Fixed punch 2 ... Die 3 ... Movable punch 4 ... Contact plate 5 ... Linear gauge 6 ... Control panel 7 ... Display 11 ... Weight measuring device 12 ... Judgment device 13 ... Sorting machine 14 Printer

Claims (3)

[Claims] 1. A tableting machine for obtaining a predetermined molded product by pressing a material to be molded between said punches by moving said movable punch toward a fixed punch, said movable punch at the end of pressurization. A tablet press molding machine, comprising: means for measuring a distance between the molding and the fixing punch; and means for judging the quality of the molded product based on a result of the measurement. 2. A tableting machine for obtaining a predetermined molded product by pressing a material to be molded between said punches by moving said movable punch toward a fixed punch, wherein said movable punch at the end of pressurization. And means for measuring the distance between the fixed punch and the fixing punch, means for measuring the weight of the molded article, and means for determining the quality of the molded article based on the measured distance and weight. Characteristic tableting machine. 3. The tableting machine according to claim 1, further comprising means for controlling so as to stop the molding process when the molded article is determined to be defective. Molding machine.