JP2710039B2 - Grinding degree control device for crusher - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a roll-type pulverizer used for milling wheat or the like, and more particularly to control of the pulverization degree of the pulverizer.

(Prior art)

In the milling work for making flour from wheat, a milling material (raw material to be crushed) such as wheat is supplied to a roll crusher and crushed. They are arranged and further functionally combined with various sorters and transporters to obtain a crushed product such as flour (a product crushed to a required particle size).

[Problems to be solved by the invention]

As described above, in order to efficiently operate a plurality of crushers and a sorting device to mass-produce high-quality crushed products, the degree of crushing by a roll crusher and the screening of a sifter in a sifting device such as a sifter separating device. Special attention had to be paid to the configuration and the like. In the pulverization by a roll pulverizer, the gap between a pair of rolls is a major factor that determines the degree of pulverization, and it takes a lot of time to adjust the pulverization degree. In addition, differences in various characteristics such as the particle size and water content of the supplied crushing material appear as differences in the degree of crushing, and during the operation process, the degree of crushing changes and it is necessary to check and adjust the gap between the rolls. And had

The present invention solves the conventional problems by discriminating the degree of pulverization and automatically adjusting the rotation speed of the rolls of the pulverizer, which controls the degree of pulverization, to constantly mass-produce high-quality pulverized products. An object of the present invention is to provide a pulverizing control device for a pulverizer.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a pulverizer in which a pair of rolls provided with a rotational speed difference are rotatably opposed to each other, and a transmission is provided on a drive side that drives the pair of rolls in conjunction with each other. A measuring device for judging the degree is attached to the crusher, and an output signal of the measuring device is communicated to the transmission through a control device, and the measuring device comprises a large-size sorting machine and a weighing scale. And a means for solving the problem by means of discrimination by measuring the projected area of the crushed grains.

(Operation)

The measuring device measures and determines the degree of crushing of the particles, sends an output signal to the control device, controls the speed change device of the crushing roll to adjust the rotation speed of the roll, and always obtains a desired degree of crushing. Can be

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 shows a process of milling wheat or the like, in which a measuring device for determining the degree of pulverization is composed of a weighing scale and a sizing machine for sorting crushed particles. Here, 4 crushers (milling machines) 1,2,3,4 and 3 sieving machines
The main components are 5, 6, and 7.

The first crusher 1 communicates with the cyclone 8 by pneumatic transport, and the cyclone 8 has an air lock valve 9
A measuring device consisting of a large-size sorter and a weighing scale that discriminates the degree of pulverization of a part of the pulverized particles with the valve 10 having a switching valve.
11 to the supply port of the first sieve sorter 5. In the present embodiment, the sieve sorter 5 can sort and separate into three stages according to the grain size.
It has a medium particle outlet 13 and a small particle outlet 14, the large particle outlet 12 to the supply port of the crusher 1, the medium particle outlet 13 to the supply port of the second crusher, and the small particle outlet 14. Will contact Cyclone 15 respectively. The measuring device 11 has a built-in grain size sorter
The separation is performed in stages, and the large particles are communicated to the supply port of the first crusher 1 and the other particles are supplied to the supply port of the second crusher 2.

The second crusher 2 communicates with the cyclone 15 by pneumatic transportation. The cyclone 15 is provided with an air lock valve 16 at a lower portion thereof, and a part of the crushed particles is crushed by a valve 17 with a switching valve. Is communicated so as to be supplied to the measuring device 18 for judging the condition, and further to the supply port of the second sieve sorter 6. The sieve sorter 6 can sort and separate into three stages by grain size,
It has a large particle outlet 19, a medium particle outlet 20, and a small particle outlet 21. The large particle outlet 19 is connected to the supply port of the second crusher 2, and the medium particle outlet 20 is connected to the third crusher 3. And the small particle outlet 21 communicates with the cyclone 22. The measuring device 18 has a built-in large-size sorting machine similar to the measuring device 11 and sorts and separates the particles into two stages. The large particles are supplied to the supply port of the second crusher 2 and the other particles are subjected to the third crushing. To send it to the supply port of the machine 3.

Next, the third pulverizer 3 communicates with the cyclone 23 by pneumatic transportation, and the cyclone 23 has an air lock valve 24 at a lower portion thereof, and a part of the pulverized particles is pulverized by the valve 25 with the switching valve. It is communicated to the measuring device 26 for judging the degree so as to supply it as appropriate, and further to the supply port of the third sieve sorting machine 7. The sieve sorter 7 can sort and separate into three stages by grain size,
It has a large particle outlet 27, a medium particle outlet 28 and a small particle outlet 29, the large particle outlet 27 to the supply port of the fourth crusher 4, the medium particle outlet 28 to the cyclone 30, The outlets 29 communicate with the cyclones 31, respectively. Then, the fourth crusher communicates with the cyclone 23 by pneumatic transportation.

The exhaust of cyclones 8, 15, and 23 communicates with cyclone 33 via blower 32, and the exhaust of cyclones 22, 31, and 30 also blows.
The cyclone 35 is connected to the cyclone 35 via 34, and the exhaust of the cyclones 33 and 35 is discharged to the outside through the bag filter 36. Cyclones 22, 30, 31, 33, and 35 all have an air lock
Valves 37, 38, 39, 40, 41 are provided to communicate with supply ports of powder receiving tanks 42, 43, 44 for storing the crushed material. In this figure, measuring devices 11, 18, and 26 are shown, but particularly when the measuring device for determining the degree of pulverization is composed of a grain size sorter and a weighing scale,
In the case where the measuring device determines the degree of pulverization by measuring the projected area of the pulverized particles, the flow at that portion becomes a bypass for measurement.

Next, the crushers 1 to 4 of the present embodiment will be described with reference to FIG.

The crusher shown in FIG.
2, 63 provided in the grinding chamber, engaged by gears 65, 66 mounted on the respective rolls, forming a pair of opposing rolls that rotate in conjunction with a certain rotational speed difference, furthermore, the roll driving motor 67 The belt 76 wound around the drive wheel 68 is used for the wheel
By being wound around 64, a pair of rolls 62 and 63
It rotates in conjunction with. The driving motor 67 has a transmission 69, and the transmission may be a main motor 67 with an inverter mounted thereon or an arbitrary variable speed motor.
In addition, the speed change by the drive sheave, the sheave for main shaft 64, and the belt 76 can be arbitrarily selected, for example, by using a barrier pulley.

In this embodiment, a variable speed motor for adjusting the rotation speed by the speed control motor 75 is shown.

Reference numeral 70 denotes a supply hopper provided at the upper portion of the crusher, reference numeral 72 denotes a feeding roll provided at a discharge port of the hopper 71, and reference numeral 73 denotes a control valve. The lower part of the pulverizing chamber is a discharge gutter 74 for pneumatic transportation.

Next, the measuring devices 11, 18, and 26 for determining the degree of pulverization, which are composed of a grain size sorting machine and a weighing scale, will be described with reference to FIG. Valves 10, 17, and 25 with switching valves are provided below the air lock valves 9, 16, and 24 provided below the cyclones connected to the pulverized material discharge ports of the pulverizers 1 to 3, and the switching valves are electromagnetic solenoids 45. To open and close. At the lower part of the supply cylinder 46 of the measuring instruments 11, 18, 26 to which the sample appropriately pulverized by the valve is supplied,
A first tank 48 having a load cell 47 attached thereto and configured to be weighable is provided, and an openable shutter 51 driven by an electromagnetic solenoid 50 is provided at an outlet 49 of the tank 48.
Is provided, and the sieve screen 52 is exchangeably stacked below the discharge port 49, and a sieve sorter 53, which is a large-size sorter provided swingably, is provided. Large particles and other particles passing through are separated and separated in two stages, and the large particle discharge gutter 54 of the sieve separator is connected to a second tank 56, which is provided with a load cell 55 and can be weighed. The particle discharge trough 57 is connected to the next process such as a crusher. The tank
A discharge port 58 is provided with a shutter 60 which can be opened and closed by an electromagnetic solenoid 59, and a discharge gutter is provided below the tank 56.
61 is provided to inform the process of the crusher etc.

Here, the control circuit 80 for adjusting the roll gap in the case where the measuring device for determining the degree of pulverization is composed of a large-sized sorter and a weighing scale will be described. As shown in FIG. A weighing circuit 81 for weighing W ₁ and W ₂ is communicated to an arithmetic circuit 82, and further to a comparison control circuit 84 together with a reference value setting circuit 83. The comparison control circuit 84 is a drive circuit
Via 85, it communicates with the motor 75 for speed control, and also communicates with the solenoid etc. which drives the shutter of the tank and the like.

Also, a case where the measuring device for determining the degree of pulverization determines the degree of pulverization by measuring the projected area of the pulverized particles will be described. In order to obtain an image signal of the projected area measurement as shown in FIG. A camera 86 is provided. For example, the measuring instrument
As in 11, a bypass is provided from the valve with a switching valve 10, and a measurement unit including a camera 86 is provided on the bypass road wall. By capturing the crushed particles being transported by the camera 86, the crushed particles are processed as the number of pixels, converted into a projection area, and compared with a predetermined value. As a result of the comparison, if the predetermined value is different from the grinding degree, the driving circuit 89
And a signal is sent to the speed control motor 75 and to a solenoid or the like for driving a shutter of a tank or the like.

The operation of the above embodiment will be described. Explaining with reference to the flow chart shown in FIG. 1, a crushing material such as wheat is first supplied to a first crusher 1 and crushed, and the crushed particles are transported by air to a cyclone 8 for air lock.・ Sieving and sorting machine 5 for sorting large grains through valve 9 and valve 10 with switching valve
Supply to In the sorting machine, sieve nets having different sieve meshes are stacked in a plurality of stages, and the mesh is oscillated to separate and separate into large, medium, and small particles, and the large particle discharge port 12, the medium particle discharge port 13, and the small particle discharge port. Each is discharged to the outlet 14. Here, the large particles are reduced to the feed hopper of the first crusher 1 and the medium particles are reduced to the second hopper.
And the small particles are fed to the cyclone 15.

Further, the pulverized particles supplied to the second pulverizer and pulverized are supplied to the cyclone 15, and are supplied to the second sieve separator 6 via the air lock valve 16 and the valve 17 with a switching valve. The second sieve sorter 6 also sorts and separates the particles into large, medium and small particles, and discharges them to a large particle outlet 19, a medium particle outlet 20, and a small particle outlet 21, respectively. Here, the large particles are reduced to the supply hopper of the second pulverizer, the medium particles are supplied to the supply hopper of the third pulverizer, and the small particles are supplied to the cyclone 22.・ Stored in the tank 42 as a crushed product via the lock valve 37.

Further, the pulverized particles supplied to the third pulverizer 3 and pulverized are sent to the cyclone 23 and the air lock valve 24 is supplied thereto.
And, it is sent to the third sieve sorting machine 7 through the valve 25 with the switching valve. The third sieve sorter 7 also sorts and separates the particles into large, medium and small particles, and discharges them to a large particle outlet 27, a medium particle outlet 28, and a small particle outlet 29, respectively. Here, the large particles are sent to the supply hopper of the fourth crusher 4, and the medium particles are cyclone.
The air is supplied to an air-locking valve 38 and is stored in a tank 44 as a powdered material. The small particles are sent to the cyclone 31 where they are separated by airflow and the air lock valve 39
After that, it is stored in the tank 43 as a crushed material. Cyclone
The exhaust of 8,15,23 is sent to cyclone 23, and the exhaust of cyclones 22,30,31 is also sent to cyclone 35, air is separated, and air is filtered through air lock valves 40,41. And stored in the tank 43.

To describe the adjustment of the rotation speed of the roll when the measuring device for determining the degree of pulverization is composed of a grain size sorter and a weighing scale,
For example, in the crusher 1, the crushing material such as wheat supplied to the supply hopper is crushed when passing through the opposing rotating gap between the pair of rolls 62 and 63, and is pneumatically transported to the cyclone 8. A part of the pulverized particles is introduced as a sample into the measuring device 11 by operating the attached valve 10, where the sample is first stored in the first tank 48, and the weight W ₁ is weighed by the load cell 47. After that, the shutter 51 at the lower part of the tank 48 is opened, and is fed to a sieve sorter 53 for large-size sorting, and is separated into those that pass through a certain sieve mesh 52 and those that do not pass through. and, wherein the pooled by supplying the sample which does not pass into the second tank 56 are weighed the weight W ₂ in the load cell 55. Here, to explain the control circuit shown in FIG. 4, the ratio of W ₁ and W ₂
W ₂ / W ₁ in the comparison control circuit within 84, compared with the reference value outputted from the reference value setting circuit 83 as well as operation, W ₂ / W ₁ of the ratio is low if grindability larger, the rotational speed of the rolls it means that the faster, increasing the degree of grinding supplies driving signals to reduce the rotation of the electric motor 67 to the speed control motor 75 emits a signal to the drive circuit 85 from the comparator control circuit 84, also, W ₂ / smaller compared ratio W ₁ is the reference value, it means that the rotational speed of the grinding degree is too high roll is slow, increases the rotation of the motor 67 is reversely rotated the electric motor 75, the degree of grinding By lowering, the operation of the crusher can always be stably maintained at a predetermined crushing degree. In this case, the degree of pulverization is directly determined by using a grain size sorter and a weighing scale, and as shown in the flow diagram (FIG. 1) showing the milling process, each pulverizer is It is possible to cope with a change in the amount of the crushing material to be supplied or the presence of the crushing material to be reduced from the next sieve sorter.

Further, in the case where the measuring device for determining the degree of crushing determines the degree of crushing by measuring the projected area, signals obtained from the measuring device including the camera 86 provided in the bypass path are A / D, D /
The A converter 87 analyzes each particle as the number of pixels of the projected area, and the CPU 88 converts the number of pixels into the particle diameter of one particle from the equation of number of pixels = πr ² . The degree of grinding is set in advance in the CPU 88, and the particle size distribution of the converted particle size is compared with the set degree of grinding.If the peak of the particle size distribution is larger than the set value, the degree of grinding is low, and the rotation speed of the roll is high. Because it means
A signal is sent from the CPU 88 to the drive circuit 89, and a drive signal is given to the speed control motor 75 so as to reduce the rotation of the motor 67.On the contrary, if the vertex of the particle size distribution is smaller than the set value, the degree of grinding is high, and CP means that the rotation speed is slow
A signal is issued from U88, and a drive signal is given from a drive circuit 89 so as to increase the rotation of the electric motor 67, so that the operation of the crusher can always be stably maintained at a predetermined crushing degree.

〔The invention's effect〕

The pulverizing control device of the pulverizer of the present invention is provided with a measuring device for determining the degree of pulverization in association with the pulverizer, and adjusts the rotation speed of the pulverizing roll according to an output signal of the measuring device to obtain various types of pulverized material. Regardless of the difference in characteristics, etc., a predetermined degree of pulverization can always be stably maintained. In addition, in a crusher used for milling, since the crushing is determined in a stepwise manner and crushed, more precise control of the crushing degree is required in each crusher. The pulverizer can be easily operated and operated properly, and a high-quality powder can always be efficiently mass-produced.

[Brief description of the drawings]

FIG. 1 is a flow chart of a milling process showing an embodiment of the present invention, FIG. 2 is a side sectional view of a crusher, FIG. 3 shows an embodiment of a measuring device for determining the degree of crushing, FIG. FIG. 5 is a control circuit diagram, and FIG. 5 is a measuring device and a circuit diagram for determining the degree of pulverization of another embodiment. 1 crusher, 2 crusher, 3 crusher, 4 crusher, 5 sifter sorter, 6 sieving sorter, 7 sieving sorter, 8 cyclone, 9 ... Air lock valve,
10… Valve, 11… Measuring instrument, 12… Large particle outlet, 13
… Medium particle outlet, 14… Small particle outlet, 15… Cyclone, 16… Air lock valve, 17… Valve, 18
… Measuring instrument, 19… Large particle outlet, 20… Medium particle outlet, 21… Small particle outlet, 22… Cyclone, 23… Cyclone, 24… Air lock valve, 25… ... Valve, 26 ... Measuring instrument, 27 ... Large particle outlet, 28 ... Medium particle outlet, 29 ... Small particle outlet, 30 ... Cyclone, 32 ...
… Blower, 33 …… Cyclone, 34 …… Blower, 35 …… Cyclone, 36 …… Bug filter, 37 …… Air lock valve, 38 …… Air lock valve, 39 …… Air lock valve , 40 …… Air lock valve, 41…
… Air lock valve, 42 …… tank, 43 …… tank, 44 …… tank, 45 …… solenoid, 46 …… supply cylinder,
47 …… Load cell, 48 …… Supply tank, 49 …… Outlet,
50 …… solenoid, 51 …… Shutter, 52, sieve net, 53…
… Sieve sorter, 54… Large particle discharge gutter, 55… Load cell,
56 …… Tank, 57 …… Discharge gutter, 58 …… Discharge port, 59 …… Solenoid, 60 …… Shutter, 61 …… Discharge gutter, 62 …… Roll, 63 …… Roll, 64 …… Spindle for spindle , 65: Gear for main shaft, 66: Gear for counter shaft, 67: Main motor, 68: Drive gear, 69: Transmission, 70: Supply hopper, 71: Machine frame, 72: Dispensing roll, 73 ... control valve, 74 ... discharge gutter,
75 ... speed control motor, 76 ... belt, 80 ... control circuit, 81 ... weighing circuit, 82 ... arithmetic circuit, 83 ... reference value setting circuit, 83 ... comparison control circuit, 85 ... drive Circuit, 86 ……
CCD camera, 87: A / D, D / A converter, 88: CPU, 8
9 ... Drive circuit.

Claims (3)

(57) [Claims] In a crusher provided with a pair of rolls provided with a rotational speed difference so as to be able to rotate oppositely and a transmission arranged on a drive side for driving the pair of rolls in an interlocking manner, a measuring device for judging the degree of crushing is provided. A pulverization degree adjusting device for a pulverizer, wherein the output signal of the measuring device is connected to the transmission through a control device in association with the pulverizer. 2. The apparatus according to claim 1, wherein the measuring device comprises a weighing machine and a large-size sorter for determining the degree of crushing by crushing the crushed particles. 3. The apparatus according to claim 1, wherein the measuring device determines the degree of pulverization by measuring the projected area of the pulverized particles.