JP3602375B2 - Dehydration cake hardness meter and hardness measurement method using the same - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hardness meter for a dewatered cake used as a raw material for ceramic products such as insulators and a hardness measuring method using the same.
[0002]
[Prior art]
In the manufacturing process of insulators and the like, a method is employed in which a raw material slurry is dehydrated by a filter press to form a flat dewatered cake, and the dewatered cake is put into a clay kneader and extruded into a predetermined shape. However, since the hardness of the dewatered cake varies due to a slight difference in moisture content and the like, if the dewatered cake is directly put into a clay kneader, it causes troubles such as an unstable extrusion speed from the clay kneader.
[0003]
For this reason, for example, about 35 sheets of dewatered cakes are stacked on a pallet, and cut into a vertical direction while being put into a kneading machine, thereby devising a method of averaging the variation in hardness among the dewatered cakes. Variations in hardness among a number of dewatered cakes stacked on the same pallet can be eliminated. However, the hardness difference between different pallets will remain.
[0004]
Therefore, it is necessary to measure the average hardness of a large number of dewatered cakes stacked on a pallet. Therefore, as shown in Japanese Utility Model Application Laid-Open No. 63-109639, the present applicant compresses a large number of dewatered cakes stacked on a pallet with an Amsler-type press, and the maximum proof stress (maximum pressure) received by the press. A device for measuring the average hardness of the dewatered cake based on the value of was developed. This device has been used in factories to date to show accurate hardness in many cases.
[0005]
However, it has been found that this device has the following problems.
1) If a high moisture content dewatered cake is interposed in the middle of a large number of dewatered cakes stacked on a pallet, the dewatered cake will buckle and the maximum proof stress received by the pressing machine will be significantly reduced. Hardness cannot be measured.
2) Similarly, if the pallet itself is deformed, the average hardness of the dewatered cake cannot be measured.
3) Once measured, the same product cannot be measured repeatedly because the dehydrated cake breaks. Therefore, the soft dehydrated cake is naturally dried, and the hardness cannot be measured again later.
[0006]
[Problems to be solved by the invention]
The present invention solves the above-described conventional problems, and can accurately measure the average hardness of a large number of dewatered cakes stacked on a pallet, and can repeatedly perform the measurement. The purpose of the present invention is to provide a hardness meter for a dehydrated cake and a hardness measuring method using the same, which do not need to be transported to the same.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a dehydration cake hardness meter according to claim 1 of the present invention has a compression spring housed inside a cylindrical body having a handle at a base portion, and the distal end of the cylindrical body has the compression spring. A slider always held forward by a compression spring is provided in a resilient state, and a long rod that can penetrate a plurality of dewatered cakes to a predetermined depth is attached to the slider. Rutotomoni provided a scale for displaying the amount of compression of the compression spring when passed through the cake, the phase of compression of the compression springs and the hardness of the dehydrated cake when pushed in the elongated rod to a predetermined depth in the dehydrated cake The relationship number R is set to 0.900 or more .
The method for measuring the hardness of a dewatered cake according to the second aspect of the present invention is a method for measuring the hardness of a plurality of dehydrated cakes by pushing a long bar of the dehydrated cake hardness meter according to the first aspect of the present invention to a predetermined depth. And the average hardness of the dewatered cake is measured by reading the compression amount of the compression spring at that time. In addition, it is also possible to make this hardness tester an automatic measuring device.
[0008]
According to the present invention, it is possible to relatively accurately measure the average hardness of a large number of dewatered cakes stacked on a pallet. In addition, the measurement can be repeated by shifting the pushing position of the long bar. Further, since the hardness meter is portable, there is an advantage that the hardness of the dehydrated cake can be measured anytime and anywhere.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described.
FIG. 1 is a cross-sectional view showing a hardness meter for a dewatered cake of the present invention. Reference numeral 1 denotes a cylindrical cylinder, and 2 denotes a handle firmly fixed to a base portion thereof by welding or the like. A compression spring 3 and a slider 4 are housed inside the cylindrical body 1. The slider 4 is always repelled forward by the compression spring 3, but since the pin 5 protruding from the side of the slider 4 is fitted in the long hole 6 of the cylindrical body 1, the position of FIG. You cannot move forward. Therefore, the slider 4 is always held forward by the compression spring .
[0010]
An adapter 8 is fixed to the tip of the slider 4 via a slightly thick rod 7, and an elongated rod 9 made of metal such as stainless steel is attached to the adapter 8. The long bar 9 has a length capable of penetrating a plurality of dehydrated cakes, and in this embodiment, is a round bar having a diameter of 6 mm and a length of about 300 mm. The distal end of the long rod 9 has an R shape, preferably an R shape having a radius of about 3 mm. A pointer 10 is attached to the pin 5 of the slider 4, and a scale 11 is provided beside the long hole 6 of the cylindrical body 1 as shown in FIG. 2. The scale 11 is for displaying the compression amount of the compression spring 3 due to the resistance when the long rod 9 is pushed into the dewatering cake.
[0011]
In order to measure the hardness of the dehydrated cake using this hardness meter, the measurer grasps the handle 2 and, as shown in FIG. Press. Accordingly, the long bar 9 moves through the plurality of dewatered cakes as shown in FIG. 4 while moving the dewatered cake having a volume corresponding to the pushing amount of the long bar 9 to the side. At this time, physical resistance from the dehydrated cake acts on the tip of the long bar 9 and resistance from the dehydrated cake also acts on the side surface of the long bar 9. Moreover, since the long bar 9 has a length that can penetrate a plurality of dewatered cakes, the total value of the resistance exerted on the long bar 9 by the plurality of dewatered cakes acts on the compression spring 3 and compresses the compression spring 3. I do. The measurer pushes the long rod 9 to a predetermined depth (the position of the adapter 8), and reads the amount of compression of the compression spring 3 at that time by the scale 11.
[0012]
As shown in the data of the following examples, the read value of the compression amount has a high correlation with the true value of the hardness of the dewatered cake. That is, in the present invention, the correlation coefficient between the compression amount of the compression spring 3 and the hardness of the dewatered cake when the long rod 9 is pushed into the dewatered cake to a predetermined depth as described below with reference to FIGS. R has a high correlation of 0.900 or more.
Moreover, the true value of the hardness of the dehydrated cake is back-calculated values from extrusion rate from clay extruder. In addition, it was confirmed that the read value of the compression amount was hardly affected by the pushing speed and pushing force of the long rod 9 and was almost constant when the long rod 9 was pushed to a predetermined depth.
[0013]
【Example】
A hardness tester having the structure shown in FIG. 1, wherein the compression spring 3 is a compression coil spring having a diameter of 3 mm, a number of turns of 14, a coil diameter of 50 mm, and a natural length of 100 mm, and the long rod 9 has a diameter of 6 mm and a length of 340 mm. Was used to measure the hardness of the dewatered cake. The dewatered cake had a diameter of 700 mm and a thickness of 20 mm and was dehydrated by a filter press, and 36 sheets were stacked on a pallet. As shown in FIG. 3, a long rod 9 was inserted obliquely from its end face.
[0014]
FIG. 5 is a graph in which the read value of the scale 11 when the hardness of the dehydrated cake is measured at the center height of 36 sheets is set on the horizontal axis, and the true value calculated backward from the extrusion speed from the clay kneader is set on the vertical axis. The measurement was performed about 20 times while changing the measurement object. The correlation coefficient in this case was 0.903, and it was confirmed that the hardness of the dehydrated cake can be accurately measured by the method of the present invention. FIG. 6 is a similar graph when the hardness of the dehydrated cake is measured at a height of about 1/4 from the top of 36 sheets, and the correlation coefficient in this case was 0.913.
[0015]
7 and 8 are similar graphs when the hardness of another dewatered cake having a different raw material system is measured. FIG. 7 shows the measurement result at the center height of 36 sheets, and FIG. The measurement results at a height of about 1/4 from the top in the middle are shown. The correlation coefficient in FIG. 7 is 0.909, and the correlation coefficient in FIG. 8 is 0.914. As described above, according to the present invention, it is possible to perform a measurement in which the correlation coefficient with the true value exceeds 0.9. On the other hand, the measured value using the Amsler pressurized machine described in the prior art has a large variation as shown in FIG. 9, for example, and the correlation coefficient is 0.686, which indicates that the advantage of the present invention is high. it is obvious.
[0016]
【The invention's effect】
As described above, according to the hardness meter and the hardness measurement method of the present invention, the average hardness of a large number of dehydrated cakes can be accurately measured. In addition, since the same sample can be repeatedly measured because only a thin long rod is inserted, if the hardness is too low at the first measurement, the dehydrated cake is naturally dried, and the hardness may be measured again at a later date. it can. Further, since the hardness measuring instrument of the present invention can be carried anywhere, there are many advantages such as the need to transport the dehydrated cake to the measuring device unlike the related art.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a hardness meter for a dehydrated cake of the present invention.
FIG. 2 is an external view of a scale portion.
FIG. 3 is an explanatory diagram of a method for measuring the hardness of a dehydrated cake of the present invention.
FIG. 4 is a cross-sectional view showing a state where a long bar is inserted.
FIG. 5 is a graph showing data (measurement position, central portion) of the example.
FIG. 6 is a graph showing data (measurement position, upper part) of the example.
FIG. 7 is a graph showing data (measurement position, central portion) of the example.
FIG. 8 is a graph showing data (measurement position, upper part) of the example.
FIG. 9 is a graph showing measurement data using an Amsler-type press.
[Explanation of symbols]
1 cylindrical body, 2 handles, 3 compression springs, 4 sliders, 5 pins, 6 long holes 7 rods, 8 adapters, 9 long rods, 10 pointers, 11 scales, 12 pallets

Claims (2)

A compression spring is housed inside a cylinder having a handle at the base, and a slider which is always held forward by the compression spring at the tip of the cylinder is provided. Attach the long length of the length that can penetrate the cake, also the tubular member provided with a scale for displaying the amount of compression of the compression spring when passed through to a predetermined depth a long rod into dehydrated cake Rutotomoni, the long A hardness meter for a dewatered cake, wherein a correlation coefficient R between a compression amount of a compression spring and a hardness of the dewatered cake when the rod is pushed into the dewatered cake to a predetermined depth is 0.900 or more. . The long bar of the hardness meter of the dewatering cake according to claim 1 is pushed to a predetermined depth into a plurality of the dewatering cakes stacked, and the plurality of dewatering cakes penetrate, and the compression amount of the compression spring at that time is read. A method for measuring the hardness of a dewatered cake, comprising: measuring the average hardness of the dewatered cake.

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