JP7050447B2 - Manufacturing method of crushed material by roll type crusher and roll type crusher - Google Patents

Description

The present invention relates to a method for producing a crushed product by a roll-type crusher and a roll-type crusher for obtaining a crushed product by crushing raw material powders and granules by passing through a gap between a pair of rotating rolls.

In the grinding process, which is the process of grinding wheat in the milling process of milling wheat to make wheat flour, first, the braking of carefully selected wheat is performed. For braking, a roll-type crusher equipped with a brake roll, which is a sharpening roll, is used, and crushed wheat pieces (semolina) having various particle sizes are obtained by braking. Next, the semolina obtained by braking is sieved by a shifter and graded to be separated from the skin. Since a considerable amount of endosperm is attached to the skin, it is crushed again by a roll-type crusher equipped with a brake roll of the next stage. Next, purification is performed to remove the skin that could not be removed by grading from semolina.

Next, the semolina that has been purified by purification and has been sorted and screened is crushed into small pieces to make flour of the required particle size. For reduction, a roll-type crusher equipped with a smooth roll, which is an inconspicuous smooth roll, is used. Next, the skin remaining from the flour powdered to the required particle size in the reduction is sieved. A roll-type crusher for crushing wheat is disclosed in Patent Document 1 and the like.

Special Table 2002-50004 Gazette

By the way, in reduction, it is necessary to crush semolina through steps so as not to deteriorate the quality of semolina. Therefore, a plurality of roll-type crushers equipped with smooth rolls are used, and the optimum quality of semolina obtained by the roll-type crushers equipped with each smooth roll is specified.

In the past, workers collected semolina crushed by a roll-type crusher equipped with a smooth roll, and manually opened the gap between the smooth rolls of the roll-type crusher while observing the operating conditions of the roll-type crusher such as the roll temperature. I was adjusting.

However, when the worker obtains the characteristic value regarding the particle size of the crushed semolina and manually adjusts the roll gap of the roll type crusher based on the characteristic value regarding the particle size, the workload of the worker becomes large. Frequent adjustment of the roll gap was difficult. Further, there is a problem that the adjustment accuracy of the roll gap varies depending on the worker.

An object of the present invention is to provide a method for producing a crushed product by a roll-type crusher that constantly crushes semolina sorted and sieved to a predetermined particle size, and a roll-type crusher.

The method for producing a crushed product by the roll-type crusher of the present invention includes a crushing step of passing a raw material powder or granular material through a gap between a pair of rotating rolls and crushing the raw material powder or granular material to obtain a crushed product, and the crushed product. The sampling step for sampling, the measuring step for measuring the particle size distribution of the sample sampled in the sampling step, and the characteristic value of the sample calculated based on the particle size distribution of the sample measured in the measuring step are predetermined. It is characterized by having an adjusting step of adjusting the gap between the pair of rolls so as to be within the specified range.

Further, in the method for producing a crushed product by the roll type crusher of the present invention, in the sampling step, the first sampling, which is the sampling of the crushed product in a predetermined range on one side of the crushing region of the pair of rolls, And the second sampling, which is the sampling of the pulverized material in a predetermined range on the other side of the pulverized region of the pair of rolls, and in the measuring step, the particle size of the first sample sampled by the first sampling is performed. The first particle size distribution, which is the distribution, and the second particle size distribution, which is the particle size distribution of the second sample sampled in the second sampling, are measured, and in the adjustment step, the particle size distribution is based on the first particle size distribution. The gap on one side of the pair of rolls is adjusted so that the characteristic value of the first sample calculated is within a predetermined range, and the second particle size distribution is calculated based on the second particle size distribution. It is characterized in that the gap on the other side of the pair of rolls is adjusted so that the characteristic value of the sample is within a predetermined range.

Further, in the method for producing a crushed product by the roll type crusher of the present invention, in the adjustment step, when the characteristic value of the first sample is larger than the target value of the characteristic value, the gap on one side of the pair of rolls Is adjusted so that the characteristic value becomes smaller, and when the characteristic value of the first sample is smaller than the target value of the characteristic value, the gap on one side of the pair of rolls is adjusted so that the characteristic value becomes larger. When the characteristic value of the second sample is larger than the target value of the characteristic value, the gap on the other side of the pair of rows is adjusted so that the characteristic value becomes smaller, and the characteristic value of the second sample is the characteristic value. When it is smaller than the target value, the gap on the other side of the pair of rolls is adjusted so that the characteristic value becomes large.

Further, in the method for producing a pulverized product by the roll type crusher of the present invention, the characteristic value of the sample is predetermined even when the adjustment limit of the gap between the pair of rolls is adjusted to the lower limit or the upper limit in the adjustment step. It is characterized by issuing an alarm when it is not within the range.

Further, the method for producing a crushed product by the roll type crusher of the present invention is characterized in that the pair of rolls are smooth rolls used in a reduction step of pulverizing semolina to a required particle size.

Further, the method for producing a crushed product by the roll-type crusher of the present invention is characterized in that the pair of rolls is the smooth roll installed on the upper side among a plurality of smooth rolls used in the reduction step. do.

The roll-type crusher of the present invention has a crushing device in which a raw material powder or granular material is passed through a gap between a pair of rotating rolls to crush the raw material powder or granular material to obtain a crushed product, and the crushed product crushed by the crushing device. A sampling mechanism for sampling, a measuring device for measuring the particle size distribution of the sample sampled by the sampling mechanism, and a characteristic value of the sample calculated based on the particle size distribution of the sample measured by the measuring device in advance. It is characterized by comprising an adjusting mechanism for adjusting the gap between the pair of rolls so as to be within a predetermined range.

Further, in the roll type crusher of the present invention, the sampling mechanism has a first sampling mechanism for sampling the crushed material in a predetermined range on one side of the crushing region of the pair of rolls, and crushing the pair of rolls. A first particle size distribution, which is a particle size distribution of the first sample sampled by the first sampling mechanism, is provided with a second sampling mechanism for sampling the pulverized material in a predetermined range on the other side of the region. A first measuring device for measuring the distribution and a second measuring device for measuring the second particle size distribution, which is the particle size of the second sample sampled by the second sampling mechanism, are provided, and the adjusting mechanism is the first. The first adjusting mechanism that adjusts the gap on one side of the pair of rolls so that the characteristic value of the first sample calculated based on the particle size distribution is within a predetermined range, and the second particle size. It is characterized by including a second adjusting mechanism for adjusting the gap on the other side of the pair of rolls so that the characteristic value of the second sample calculated based on the above is within a predetermined range.

Further, the roll type crusher of the present invention is characterized in that the first measuring device and the second measuring device are one device.

Further, in the roll type crusher of the present invention, in the first adjusting mechanism, when the characteristic value of the first sample is larger than the target value of the characteristic value, the characteristic value is small in the gap on one side of the pair of rolls. When the characteristic value of the first sample is smaller than the target value of the characteristic value, the gap on one side of the pair of rolls is adjusted so that the characteristic value becomes large, and the second adjustment mechanism Adjusts the gap on the other side of the pair of rolls so that the characteristic value becomes smaller when the characteristic value of the second sample is larger than the target value of the characteristic value, and the characteristic value of the second sample becomes the characteristic. When the value is smaller than the target value, the gap on the other side of the pair of rolls is adjusted so that the characteristic value becomes large.

Further, in the roll type crusher of the present invention, when the characteristic value of the sample does not fall within the predetermined range even when the adjustment mechanism adjusts to the lower limit or the upper limit of the adjustment limit of the gap between the pair of rolls. It is characterized by being provided with an alarm unit that issues an alarm.

Further, the roll type pulverizer of the present invention is characterized in that the pair of rolls are smooth rolls used in a reduction step of pulverizing the semolina to a required particle size.

Further, the roll type crusher of the present invention is characterized in that the pair of rolls is the smooth roll installed on the upper side of the plurality of smooth rolls used in the reduction step.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a method for producing a crushed product by a roll-type crusher that constantly crushes semolina sorted and sieved to a predetermined particle size, and a roll-type crusher.

It is a figure which shows the grinding process in the wheat milling which concerns on embodiment. (a) is a schematic view from the top surface showing the configuration of a roll type crusher provided with a smooth roll used in the crushing step according to the embodiment, and (b) is a schematic view seen from the side surface. It is a figure which shows the system structure of the roll type crusher provided with the smooth roll which concerns on embodiment. It is a flowchart which shows the particle size distribution control of the semolina pulverized by the roll type pulverizer provided with the smooth roll which concerns on embodiment.

Hereinafter, the grinding step in wheat milling according to the embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing a grinding step in wheat milling according to an embodiment. As shown in FIG. 1, first, the wheat selected in the braking process is braked. That is, the carefully selected wheat is crushed by a roll-type crusher (1B roll) equipped with a brake roll which is a sharpening roll to obtain crushed pieces (semolina) of wheat having various particle sizes. Next, in the grading step, semolina obtained by braking with a 1B roll is sieved by a shifter and separated from the skin. Since a considerable amount of endosperm is attached to the skin, the skin is returned to the braking step and crushed again by a roll-type crusher (2B roll) equipped with a brake roll of the next stage.

Similarly, in the braking step, the semolina obtained by braking with a 2B roll is sieved by a shifter in the grading step and separated from the skin. The separated skin is returned to the braking process and crushed again in a roll crusher (3B roll) equipped with a brake roll of the next stage. Further, in the braking step, the semolina obtained by braking with a 3B roll is sieved by a shifter in the grading step and separated from the skin. The separated skin is returned to the braking process and crushed again in a roll crusher (4B roll) equipped with a brake roll of the next stage. Further, in the braking step, the semolina obtained by braking with a 4B roll is sieved by a shifter in the grading step and separated from the skin. The sieving skins by this grading are taken out as large bran or small bran.

In the grading step, semolina is separated from the skin in the braking step and semolina is separated by particle size by a shifter.

Next, in the purification step, the skin part that could not be removed by grading is removed for each semolina classified by particle size in the grading step. The removed skin is taken out as a small bran.

Next, in the reduction step, the semolina purified, sorted and screened in the purification step is finely crushed into flour having the required particle size. In the reduction step, a multi-stage roll crusher 10, 11, 12, 13, 14, 15, 16 is used, and semolina is sequentially crushed into flour having a required particle size through the steps. The roll-type crushers 10, 11, 12, 13, 14, 15, and 16 are roll-type crushers equipped with a smooth roll, which is an inconspicuous smooth surface roll, and the roll-type crushers 10, 11, In order to crush semolina into flour in order of 12, 13, 14, 15, 16 to obtain the required particle size, crushed flour for each roll type crusher 10, 11, 12, 13, 14, 15, 16 The target particle size distribution, which is the target value of the particle size distribution of, is specified.

In the reduction step, the wheat flour pulverized to the required particle size by each roll type crusher 10, 11, 12, 13, 14, 15, 16 is sieved and the skin is removed as a small bran. Further, the sieved wheat flour is crushed again by each roll type crusher arranged on the downstream side according to the particle size.

2 (a) and 2 (b) are views showing the configuration of a roll-type crusher 10 provided with a smooth roll according to an embodiment. The roll-type crusher 10 has a pair of smooth rolls 10a and 10b, and semolina, which is a raw material powder, is passed through a gap between the pair of rotating smooth rolls 10a, 10b, and the semolina is crushed to obtain wheat flour which is a crushed product. It is a roll type crusher.

The roll-type crusher 10 includes a first sampling mechanism 20a for sampling wheat flour (first sample) in a predetermined range on one side of a crushing region of the pair of smooth rolls 10a and 10b, and a pair of smooth rolls 10a. It is provided with a second sampling mechanism 20b for sampling wheat flour (second sample) in a predetermined range on the other side of the crushed region of 10b. Further, the first particle size distribution measuring device 21a for measuring the first particle size distribution, which is the particle size distribution of the first sample sampled by the first sampling mechanism 20a, and the particle size of the second sample sampled by the second sampling mechanism 20b. A second particle size distribution measuring device 21b for measuring a second particle size distribution, which is a distribution, is provided.

Further, one of the pair of smooth rolls 10a and 10b so that the characteristic value of the first sample calculated based on the first particle size distribution measured by the first particle size distribution measuring device 21a is within a predetermined range. The characteristic value of the second sample calculated based on the second particle size distribution measured by the first gap adjusting mechanism 22a for adjusting the side gap and the second particle size distribution measuring device 21b is within a predetermined range. Therefore, a second gap adjusting mechanism 22b for adjusting the gap on the other side of the pair of smooth rolls 10a and 10b is provided.

Here, the characteristic values are (1) the medium diameter by volume in the optical diffraction method, (2) the medium diameter by particle size in the optical diffraction method, and (3) the sieve when sieved by a predetermined sieve. Lower weight, (4) Volume under the sieve when sieving with a predetermined sieve, (5) Most frequent particle size when sieving with multiple sieves with different predetermined meshes, (6). ) Separate for each particle size region and measure the density, the particle size of the region with the highest density, (7) Separate for each particle size region, measure the density, and measure the particle size of the region with the lowest density, (8) Separate each particle size region and measure the surface area to measure the particle size with the largest surface area per unit weight, (9) Separate each particle size region and measure the surface area to measure the most surface area per unit weight. Particle size with a small surface area, etc.

FIG. 3 is a diagram showing a part of the system configuration of the roll type crusher 10 according to the embodiment. The roll-type crusher 10 includes a control unit 30 that comprehensively controls the entire apparatus. The control unit 30 stores the input unit 32 for inputting the target characteristic value, which is the target value of the characteristic value of the wheat flour crushed by the roll type crusher 10, and the target characteristic value input by the input unit 32. The storage unit 34 is connected. Further, even when the gap between the pair of smooth rolls 10a and 10b is adjusted to the upper limit or the lower limit of the adjustment limit, the control unit 30 issues an alarm when the characteristic value of the crushed wheat flour does not reach the target characteristic value. A display unit 31 that displays the value of the target characteristic value input by the alarm unit 33 and the input unit 32 and the alarm by the alarm unit is connected.

Further, a first sampling mechanism 20a, a second sampling mechanism 20b, a first particle size distribution measuring device 21a, a second particle size distribution measuring device 21b, a first gap adjusting mechanism 22a, and a second gap adjusting mechanism 22b are connected. Here, the first sampling mechanism 20a, the second sampling mechanism 20b, the first particle size distribution measuring device 21a, the second particle size distribution measuring device 21b, the first gap adjusting mechanism 22a, and the second gap adjusting mechanism 22b of the roll type crusher 10 The control unit 30, the display unit 31, the input unit 32, the alarm unit 33, and the storage unit 34 form a gap adjusting unit that adjusts the gap between the smooth rolls 10a and 10b.

FIG. 4 is a flowchart showing a method for producing a crushed product by a roll-type crusher that crushes semolina to a required particle size using the roll-type crusher according to the embodiment. When the semolina is crushed by the roll type crusher 10, the first sampling mechanism 20a is used to sample wheat flour, which is a crushed product in a predetermined range on one side of the crushed regions of the pair of smooth rolls 10a and 10b. (Sampling of 1) is performed (step S11). Next, the particle size distribution (first particle size distribution) of the first sample sampled by the first sampling mechanism 20a is measured by the first particle size distribution measuring device 21a (step S12), and the first particle size distribution is controlled by the control unit 30. Send to.

Further, the second sampling mechanism 20b is used to sample wheat flour (second sampling), which is a crushed product in a predetermined range on the other side of the crushed region of the pair of smooth rolls 10a and 10b (step S13).

Next, the particle size distribution (second particle size distribution) of the second sample sampled by the second sampling mechanism 20b is measured by the second particle size distribution measuring device 21b, and the second particle size distribution is transmitted to the control unit 30. (Step S14).

Next, the control unit 30 so that the characteristic value of the first sample calculated based on the first particle size distribution measured by the first particle size distribution measuring device 21a becomes the target characteristic value stored in the storage unit 34. In addition, a first adjustment value for adjusting the gap on one side of the pair of smooth rolls 10a and 10b is calculated (step S15). Further, the control unit 30 so that the characteristic value of the second sample calculated based on the second particle size distribution measured by the second particle size distribution measuring device 21b becomes the target characteristic value stored in the storage unit 34. , A second adjustment value for adjusting the gap on the other side of the pair of smooth rolls 10a and 10b is calculated (step S16).

Next, the control unit 30 determines whether or not the first adjustment value and the second adjustment value are within the upper limit or the lower limit of the adjustment limit of the gap between the pair of smooth rolls 10a and 10b (step S17), and the upper limit or the lower limit is determined. If it exceeds, an alarm is issued by the alarm unit 33 (step S20). That is, even when the adjustment limit of the gap between the pair of smooth rolls 10a and 10b is adjusted to the lower limit or the upper limit, an alarm is issued when the characteristic value of the first sample or the characteristic value of the second sample does not reach the target characteristic value.

When the first adjustment value and the second adjustment value are within the upper limit or the lower limit of the adjustment limit of the gap between the pair of smooth rolls 10a and 10b, the first adjustment value is transmitted to the first gap adjustment mechanism 22a and the first adjustment value is transmitted. The gap adjustment mechanism 22a adjusts the gap on one side of the pair of smooth rolls 10a and 10b based on the first adjustment value (step S18).

Here, when the characteristic value of the first sample is larger than the target value of the characteristic value, the first gap adjusting mechanism 22a adjusts the gap on one side of the pair of smooth rolls 10a and 10b so that the characteristic value becomes smaller. When the characteristic value of the first sample is smaller than the target value of the characteristic value, the gap on one side of the pair of smooth rolls 10a and 10b is adjusted so that the characteristic value becomes large.

Further, the second adjustment value is transmitted to the second gap adjustment mechanism 22b, and the gap on the other side of the pair of smooth rolls 10a and 10b is adjusted by the second gap adjustment mechanism 22b based on the second adjustment value (step S19).

Here, when the characteristic value of the second sample is larger than the target value of the characteristic value, the second gap adjusting mechanism 22b adjusts the gap on the other side of the pair of smooth rolls 10a and 10b so that the characteristic value becomes smaller. When the characteristic value of the second sample is smaller than the target value of the characteristic value, the gap on the other side of the pair of smooth rolls 10a and 10b is adjusted so that the characteristic value becomes large. Then, the process returns to step S11, and the processes of steps S11 to S20 are repeated.

Note that the configurations of the roll-type crushers 11, 12, 13, 14, 15, and 16 are those having a gap adjusting portion similar to the configuration of the roll-type crusher 10, but not having a gap adjusting portion. However, among the roll-type crushers 11, 12, 13, 14, 15, and 16, the roll-type crusher installed on the upper stage side preferably has a gap adjusting portion.

According to the method for producing a crushed product by the roll-type crusher and the roll-type crusher according to this embodiment, the roll gap of the roll-type crusher is repeatedly adjusted at regular time intervals without increasing the burden on the operator. Because of this, the flour produced can be of high quality. Further, it is possible to solve the problem that the adjustment accuracy of the roll gap varies depending on the worker.

In the above-described embodiment, the first particle size distribution measuring device 21a and the second particle size distribution measuring device 21b are provided, but the first particle size distribution measuring device is sampled by the first sampling mechanism 20a. The particle size distribution of the sample (first particle size distribution) may be measured, and the particle size distribution of the second sample sampled by the second sampling mechanism 20b (second particle size distribution) may be measured. ..

10,11,12,13,14,15,16 ... Roll type crusher, 10a, 10b ... Smooth roll, 20a ... 1st sampling mechanism, 20b ... 2nd sampling mechanism, 21a ... 1st particle size distribution measuring device, 21b ... 2nd particle size distribution measuring device, 22a ... 1st gap adjusting mechanism, 22b ... 2nd gap adjusting mechanism, 30 ... control unit, 31 ... display unit, 32 ... input unit, 33 ... alarm unit, 34 ... storage unit

Claims (9)

A crushing step in which a raw material powder or granular material is passed through a gap between a pair of rotating rolls and the raw material powder or granular material is crushed to obtain a crushed product.
A sampling process for sampling the pulverized material and
A measurement step for measuring the particle size distribution of the sample sampled in the sampling step, and a measurement step.
It has an adjustment control step of adjusting the gap between the pair of rolls by an adjustment mechanism based on the particle size distribution of the sample measured in the measurement step.
The sampling step includes first sampling, which is sampling of the crushed material in a predetermined range on one side in the roll longitudinal direction of the crushed region of the pair of rolls, and the roll longitudinal direction of the crushed region of the pair of rolls. The second sampling, which is the sampling of the pulverized product in the predetermined range on the other side of the above, is performed.
In the measuring step, the first particle size distribution, which is the particle size distribution of the first sample sampled in the first sampling, and the second particle size distribution, which is the particle size distribution of the second sample sampled in the second sampling, are performed. Make measurements and
In the adjustment control step, the adjustment mechanism adjusts the gap on one side of the pair of rolls in the longitudinal direction of the roll based on the first particle size distribution, and the pair of rolls is adjusted based on the second particle size distribution. A method for producing a pulverized product by a roll-type crusher, which comprises adjusting the gap on the other side in the longitudinal direction of the roll by the adjusting mechanism . In the adjustment control step,
When the characteristic value of the first sample calculated based on the first particle size distribution is larger than the target value of the characteristic value, the characteristic value is small in the gap on one side of the pair of rolls in the roll longitudinal direction. When the characteristic value of the first sample is smaller than the target value of the characteristic value, the adjusting mechanism adjusts the gap on one side of the pair of rolls so that the characteristic value becomes large. Let me adjust
When the characteristic value of the second sample calculated based on the second particle size distribution is larger than the target value of the characteristic value, the characteristic value is small in the gap on the other side of the pair of rolls in the roll longitudinal direction. When the characteristic value of the second sample is smaller than the target value of the characteristic value, the adjusting mechanism adjusts the gap on the other side of the pair of rolls so that the characteristic value becomes large. Let me adjust
The characteristic values are (1) medium diameter by volume in photodiffraction method, (2) medium diameter by particle size in photodiffraction method, and (3) under-sieving when sieving with a predetermined sieve. Weight, (4) Volume under the sieve when sieving with a predetermined sieve, (5) Most frequent particle size when sieving with multiple sieves with different predetermined meshes, (6) Separate each particle size region and measure the density, the particle size of the highest density region, (7) Separate each particle size region, measure the density, and measure the particle size of the lowest density region, (7) 8) Separate each particle size region and measure the surface area, the particle size with the largest surface area per unit weight, (9) Separate each particle size region, measure the surface area, and measure the surface area per unit weight. The method for producing a crushed product by a roll-type crusher according to claim 1 , wherein the particle size is at least one of a small particle size . The claim is characterized in that, in the adjustment control step, an alarm is issued when the characteristic value of the sample does not fall within the predetermined range even when the adjustment limit of the gap between the pair of rolls is adjusted to the lower limit or the upper limit. Item 2. The method for producing a crushed product by the roll-type crusher according to Item 2. The method for producing a pulverized product by a roll-type pulverizer according to any one of claims 1 to 3 , wherein the pair of rolls is a smooth roll used in a reduction step of pulverizing semolina to a required particle size. .. A crushing device that passes a raw material powder or granular material through a gap between a pair of rotating rolls and crushes the raw material powder or granular material to obtain a crushed product.
A sampling mechanism for sampling the crushed material crushed by the crushing device,
A measuring device for measuring the particle size distribution of the sample sampled by the sampling mechanism,
An adjustment mechanism for adjusting the gap between the pair of rolls based on the particle size distribution of the sample measured by the measuring device is provided with an adjustment control unit for adjusting the interval between the pair of rolls.
The sampling mechanism includes a first sampling mechanism for sampling the crushed material in a predetermined range on one side in the roll longitudinal direction of the crushing region of the pair of rolls, and the roll length of the crushing region of the pair of rolls. A second sampling mechanism for sampling the pulverized material in a predetermined range on the other side in the direction is provided.
The measuring device is a first measuring device that measures a first particle size distribution, which is a particle size distribution of the first sample sampled by the first sampling mechanism, and a second sample sampled by the second sampling mechanism. A second measuring device for measuring the second particle size distribution, which is the particle size, is provided.
The adjusting mechanism is a first adjusting mechanism that adjusts a gap on one side of the pair of rolls in the longitudinal direction of the roll based on the first particle size distribution, and the adjusting mechanism of the pair of rolls based on the second particle size. A second adjusting mechanism for adjusting the gap on the other side in the longitudinal direction of the roll is provided.
The adjustment control unit causes the first adjusting mechanism to adjust the gap on one side of the pair of rolls in the longitudinal direction of the roll, and the second adjusting mechanism adjusts the gap on the other side of the pair of rolls in the longitudinal direction of the roll. A roll-type crusher characterized by being adjusted to . The roll-type crusher according to claim 5 , wherein the first measuring device and the second measuring device are one device. The adjustment control unit
When the characteristic value of the first sample calculated based on the first particle size distribution is larger than the target value of the characteristic value, the first is such that the characteristic value becomes smaller in the gap on one side of the pair of rolls . When the characteristic value of the first sample is smaller than the target value of the characteristic value, the gap on one side of the pair of rolls is adjusted by the first adjusting mechanism so that the characteristic value becomes large. Let me
When the characteristic value of the second sample calculated based on the second particle size distribution is larger than the target value of the characteristic value, the first is such that the characteristic value becomes smaller in the gap on the other side of the pair of rolls. When the characteristic value of the second sample is smaller than the target value of the characteristic value, the gap on the other side of the pair of rolls is adjusted by the second adjusting mechanism so that the characteristic value becomes large. Let me
The characteristic values are (1) medium diameter by volume in photodiffraction method, (2) medium diameter by particle size in photodiffraction method, and (3) under-sieving when sieving with a predetermined sieve. Weight, (4) Volume under the sieve when sieving with a predetermined sieve, (5) Most frequent particle size when sieving with multiple sieves with different predetermined meshes, (6) Separate each particle size region and measure the density, the particle size of the highest density region, (7) Separate each particle size region, measure the density, and measure the particle size of the lowest density region, (7) 8) Separate each particle size region and measure the surface area, the particle size with the largest surface area per unit weight, (9) Separate each particle size region, measure the surface area, and measure the surface area per unit weight. The roll-type crusher according to claim 5 or 6 , wherein the particle size is at least one of a small particle size . The adjusting mechanism is characterized by comprising an alarm unit that issues an alarm when the characteristic value of the sample does not fall within the predetermined range even when the adjustment limit of the gap between the pair of rolls is adjusted to the lower limit or the upper limit. 7. The roll-type crusher according to claim 7. The roll-type crusher according to any one of claims 5 to 8 , wherein the pair of rolls is a smooth roll used in a reduction step of pulverizing semolina to a required particle size.

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