JPH02107361A - Crushing degree control unit of grinding machine - Google Patents

Abstract

PURPOSE:To always stably keep a predetermined grinding degree regardless of the difference in the various characteristics of a material to be ground by relationally providing a measuring device for judging a grinding degree to a grinding machine and controlling the rotational speed of a grinding roll on the basis of the output signal of the measuring device. CONSTITUTION:A pair of rolls 62, 63 between which the difference in the number of rotations is provided are installed in a freely rotatable manner in opposed relationship and a transmission 69 is provided on the side rotationally driving the rolls 62, 63 in connection with each other. For example, a measuring device 86 for judging a grinding degree by measuring the projection areas of ground pebbles is relationally provided to a grinding machine and the output signal of the measuring device 86 is transmitted to the transmission 69 through a control unit 89. As a result, a predetermined grinding degree can be always stably kept regardless of the difference in various characteristics of a material to be ground.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a crusher used for milling wheat, etc., and particularly to a roll crusher.

[Prior art]

In the milling process of making flour from wheat, the flour (raw material to be crushed) such as wheat is fed to a roll crusher and crushed, but rather than being crushed into powder all at once, several roll crushers are used in series. These are then functionally combined using various sorting devices and conveying devices to obtain crushed products (products crushed to the required particle size) such as wheat flour.

[Problem that the invention seeks to solve]

In this way, in order to efficiently operate multiple crusher 1 sorting devices and mass-produce high-quality crushed products, it is necessary to adjust the degree of crushing in the roll crusher and to adjust the sieves in the sorting devices such as the sieve sorter. It was necessary to pay particular attention to the composition, etc. In pulverization using a roll pulverizer, the gap between a pair of rolls is a major factor that affects the degree of pulverization, and adjusting it requires a lot of time. In addition, differences in various characteristics such as particle size and moisture content of the supplied granules appear as differences in the degree of pulverization, and during the operation process,
The degree of grinding changed, requiring inspection and adjustment of the gap between the rolls.

In order to solve the conventional problems, the present invention determines the degree of crushing and automatically adjusts the rotation speed of the crusher nozzle, which affects the degree of crushing, so that high-quality crushed products can always be produced profitably. The purpose of the present invention is to provide a grinding adjustment device for a grinder.

Means for Solving Problem C) In order to achieve the above object, the present invention provides a pair of rolls with a difference in rotation speed so as to be rotatable opposite each other, and the pair of rolls are driven to rotate in conjunction with each other. In a pulverizer equipped with a transmission on the drive side, a measuring device for determining the degree of pulverization is attached to the pulverizer, and an output signal from the device is communicated to the transmission via a control device to perform the measurement. The problem was solved by using a device consisting of a particle size sorter and a weighing scale, and a device that discriminated by measuring the projected area of crushed particles.

[For production]

The degree of crushing by the crusher is determined by a measuring device, and the output signal is sent to the control device, which controls the speed change device of the crushing roll to adjust the rotational speed of the coal so that the desired degree of crushing is always achieved. can do.

〔Example〕

Embodiments of the present invention will be described based on FIGS. 1 to 5 of the drawings.

FIG. 1 shows the process of milling wheat, etc., and shows the case where the measuring device for determining the degree of grinding consists of a grain size sorter that sorts the crushed particles by grain size, and a weighing scale. here 4
The main components are three pulverizers (flour mills) 1.2 and 3.4 and three sieve sorters 5 and 6.7.

The first pulverizer 1 communicates with a cyclone 8 by pneumatic transport, and the cyclone 8 is provided with an air lock valve 9 at its lower part and uses a valve 10 with a switching valve to determine the degree of pulverization of some of the pulverized particles. A measuring device 11 consisting of a grain size sorter and a weighing scale is connected to the measuring device 11 for appropriate supply, and further to the supply port of the first sieve sorter 5. In this embodiment, the sieve sorter 5 separates the particles into three stages depending on the particle size, and has a large particle discharge port 12.
．． Medium particle outlet 13. It has a small particle outlet 14 , a large particle outlet 12 to the supply port of the pulverizer 1 , a medium particle outlet 13 to the supply port of the second pulverizer, and a small particle outlet 14 to the cyclone 15 . Please contact each. The measuring device 11 has a built-in particle size sorter and separates the particles into two stages, and sends large particles to the supply port of the first pulverizer 1 and other particles to the supply port of the second pulverizer 2. Please contact us as follows.

Further, the second crusher 2 is connected to a cyclone 15 by pneumatic transport, and the cyclone 15 is provided with an air lock valve 16 at its lower part, and uses a valve 17 with a switching valve to determine the degree of crushing of some of the crushed particles. The sieve sorter 6 is also contacted with the supply port I\ of the second sieve sorter 6. The sieve sorting element 16 can be separated into three stages depending on particle size, and there is a large particle discharge port 19. The medium particle outlet 20 and the small particle outlet 21 are on the right, and the large particle outlet 19 is on the right side of the second crusher 2.
The medium particle discharge port 20 communicates with the supply port of the third crusher 3, and the small particle discharge port 21 communicates with the cyclone 22.

Like the measuring device 11, the measuring device 18 has a built-in particle size sorter and separates the large particles into two stages, sending large particles to the supply port of the second crusher 2 and sending other particles to the third crusher. Contact the supply port of machine 3 to send it.

Next, the third crusher 3 communicates with the cyclone 23 by pneumatic transport, and the cyclone 23 is provided with an air lock valve 24 at its lower part, and uses a valve 25 with a switching valve to adjust the degree of crushing of some of the crushed particles. It is communicated to the measuring device 26 for discrimination so that it can be appropriately supplied, and further communicated to the supply port of the third sieve sorting machine 7. The sieve sorter 7 can sort and separate particles into three stages depending on particle size, and has a large particle discharge port 27. It has a medium particle discharge port 28 and a small particle discharge port 29, the large particle discharge port 27 is connected to the supply port of the fourth crusher 4, the medium particle discharge port 28 is connected to the cyclone 30, and the small particle discharge port 29 is connected to the cyclone 31. Please contact each of them. The fourth crusher communicates with the Sincron 23 by pneumatic transportation.

The exhaust air of cyclone 8.15.23 is connected to cyclone 33 via blower 32, and
The exhaust air from cyclones 33 and 35 is also connected to the cyclone 35 via the blower 34, and the exhaust from the cyclones 33 and 35 is connected to the bag filter 3.
6 and then released to the outside. Cyclone 22.30.31
, 33.35 both have air lock valve 3 at the bottom.
7.38.39.40.41 is provided and connected to the supply port of powder receiving tank 42.43.44 for storing crushed material. In this figure, a measuring device 11°18.26 is shown,
In particular, if the measuring device for determining the degree of pulverization consists of a grain size sorter and a weight scale, and if the measuring device determines the degree of pulverization by measuring the projected area of the pulverized grains, the flow of that part is becomes a bypass path for measurement.

Next, the crushers 1 to 4 of this embodiment will be explained based on FIG. 2.

The crusher shown in FIG.
．． 63 is provided in the grinding chamber, and is engaged with gears 65 and 66 mounted on each of the rolls, forming a pair of opposing rolls that rotate in conjunction with a certain rotational speed difference, and a driving pulley of the roll driving electric motor 67. By winding the belt 76 wound around the main shaft pulley 64, a pair of rolls 62.6
3 is interlocked and rotated by a main electric motor 67. Further, the driving electric motor 67 has a transmission device 69, and the transmission device may be a main electric motor 67 equipped with an inverter or any variable speed electric motor. Other options may be selected, such as configuring the speed change using the driving pulley, the main shaft pulley 64, and the belt 76 using a vari-byer pulley.

In this embodiment, a variable speed electric motor whose rotational speed is adjusted by a speed control electric motor 75 is illustrated.

70 is a supply hopper provided at the top of the crusher; 72 is a delivery roll provided at the outlet of the hopper 71; and 73 is a control valve. In addition, the lower part of the grinding chamber has a discharge gutter 74 for air transportation.
It is.

Next, the measuring devices 11, 18, 26, which are composed of a grain size sorter and a weight scale for determining the degree of grinding, will be explained with reference to FIG. Air lock valve 9, 16.24 installed at the bottom of the cyclone connected to the crushed material outlet of crushers 1 to 3
A valve 10, 17.25 with a switching valve is provided below (), and the switching valve is driven to open and close by an electromagnetic solenoid 45. Measuring device 11, 1 to which a suitably crushed sample is supplied by the valve.
At the lower part of the supply cylinder 46 of 8.26, there is provided a first tank 48 which is equipped with a mortar cell 47 and is configured to be capable of C weighing.
A shutter 51 that can be opened and closed and driven by 0 is provided,
Below the discharge port 49, a sieve sorting bin 53 is provided, which is a grain size sorter in which a sieve screen 52 is stacked so as to be exchangeable and swingable. Large particles that do not pass through the i52 and other particles that do pass are sorted and separated in two stages, and a large particle discharge gutter 54 of the separate Filim machine is connected to a second tank 56 that is equipped with a load cell 55 and configured to be able to weigh. At the same time, the discharge gutter 57 for other particles is connected to the next process such as a crusher. An electromagnetic solenoid 5 is provided at the outlet 58 of the tank 56.
A shutter 60 that is driven to open and close by 9 is provided,
A discharge gutter 61 is provided at the bottom of the tank 56 to communicate with a process such as a crusher.

First, the control circuit 80 for adjusting the roll gap when the measuring device for determining the degree of pulverization consists of a particle size sorter and a weight scale will be explained.As shown in FIG.
and heavy IW1. by tank 56. A weighing circuit 81 for weighing W2 is connected to an arithmetic circuit 82, and further connected to a comparison control circuit 84 together with a reference value setting circuit 83. The comparison control circuit 84 connects the speed control motor 75 via the drive circuit 85.
It also contacts the solenoid that drives the shutter of the tank, etc.

In addition, to explain the case where the measuring device for determining the degree of crushing determines the degree of crushing by measuring the projected area of the crushed particles, as shown in Figure 5, in order to obtain an image signal for measuring the projected area, the A camera 86 is provided. For example, like the measuring device 11, a bypass is provided from the switching valve 10, and a measuring section including a camera 86 is provided on the wall of the bypass path.

By capturing the crushed grains being transported with this camera 86, the crushed grains are processed as the number of pixels, converted to a projected area,
It is compared with a predetermined value. As a result of comparison, if the grinding degree differs from the predetermined value,
A signal is issued to the drive circuit 89, which communicates with the speed control electric motor 75 and also communicates with a solenoid or the like that drives a shutter of a tank or the like.

The operation of the above embodiment will be explained. To explain based on the flowchart shown in FIG. 1, crushed materials such as wheat are first supplied to the first crusher 1 and crushed, and the crushed particles are pneumatically transported and sent to the cyclone 8. Cock valve9.
It is supplied to a sieve sorter 5 which sorts grains by size through a switching valve 10. In this sorter, a plurality of sieve screens with different sieve meshes are piled up in multiple stages, and by shaking the sieve screens, the particles are sorted and separated into large, medium and small particles, and the large particle discharge port 12. Medium particle outlet 13. The particles are discharged to the small particle discharge port 14, respectively. Here, large particles are reduced to the feed hopper of the first grinder 11, medium particles are fed to the feed hopper of the second grinder 2, and small particles are fed to the cyclone 15.

Further, the crushed particles supplied to the second crusher are sent to the cyclone 15, and the air lock valve 16. After passing through the switching valve 17, the second sieve sorting begins! Send to fi6. The second sieve sorter 6 also sorts and separates particles into large, medium and small particles, and the large particle discharge port 19. Medium particle outlet 20. The particles are discharged to the small particle discharge port 21, respectively. Here, the large particle is the second
The medium particles are sent to the feed hopper of the third grinder, and the small particles are sent to the cyclone 22 where they are air-separated and crushed via the air lock valve 37. It is stored in the tank 42 as a product.

Moreover, the crushed particles supplied to the third crusher 3 and crushed are
I-kniferon 23 and air lock valve 2
4. It is fed to the third sieve sorter 7 via a switching valve 25. The third sieve sorter 7 also sorts and separates particles into large, medium and small particles, and the large particle discharge port 27. Medium particle outlet 28. The particles are discharged to the small particle discharge port 29, respectively. Here, the large particles are sent to the supply hopper of the fourth crusher 4, and the medium particles are sent to the cyclone 30, where they are separated by airflow and then put into the air lock valve 3.
8 and stored in a tank 44 as a crushed material. The small particles are sent to the cyclone 31, separated by airflow, passed through the air lock valve 39, and stored in the tank 43 as crushed material. Cyclone 8, 15.23 exhaust to cyclone 33
At the same time, the exhaust gas from the cyclones 22, 30, and 31 is also sent to the cyclone 35, where it is air-separated, passes through an air lock valve 40.4i, and is stored in a tank 43 as crushed material.

Regarding the adjustment of the rotational speed of the rolls when the measuring device for determining the degree of crushing consists of a grain size sorter and a weight meter, for example, in the crusher 1, when the crushed material such as wheat supplied to the supply hopper is They are crushed as they pass through the gap between the pair of rolls 62 and 63 that rotate oppositely, and are pneumatically transported to the cyclone 8. By operating the switching valve 10, some of the crushed particles are sent as a sample to the measuring device 11. In the vessel 11, the sample is first stored in the first tank 48, and after weighing the weight ff1lA/+ with the load cell 47, the sample is stored in the first tank 48.
The shutter 51 at the bottom is opened, and the particles are fed to a sieve sorter 53 to be sorted by grain size and separated into those that pass through the sorting sieve 52 with a certain sieve size and those that do not. The remaining sample is supplied to the second tank 56 and stored therein, and the weight ff1W2 is weighed using the O-docel 55. Now, to explain the control circuit shown in FIG. 4, the ratio W2/W+ of Wl and W2 is calculated in the comparison control circuit 84 and compared with the reference value output from the reference value setting circuit 83, and W 2 /W+ is calculated. W
If the + ratio is large, it means that the degree of grinding is low and the rotational speed of the roll is high. Therefore, a signal is sent from the comparison control circuit 84 to the drive circuit 85 and the electric motor 67 is sent to the electric motor 67 for speed control.
A drive signal is given to lower the rotation of the machine to increase the degree of grinding.
Moreover, if the ratio of W 2 / W + is small compared to the reference value, it means that the degree of grinding is too high and the rotation speed of the 0-wheel is slow. By increasing the grinding degree and lowering the grinding degree, stable operation of the crusher can be maintained at a predetermined grinding degree at all times. In this case, the degree of pulverization is directly determined by using a particle size sorter and a weight scale, and as shown in the flow diagram (Figure 1) showing the milling process, each pulverizer is It is possible to cope with changes in the amount of crushed material to be supplied, or even if there is crushed material returned from the next sieve sorter.

Regarding the case where the measuring instrument for determining the degree of crushing determines the degree of crushing by measuring the projected area, the signal obtained from the measuring section including the camera 86 installed in the bypass path is
/A converter 87 analyzes each grain as the number of pixels of its projected area, and from the formula of number of pixels = πr2, CPtJ
88 to convert to the particle size of one grain. 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 top 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. This means that the CPU 88 issues a signal to the drive circuit 89 and gives a drive signal to the speed control motor 75 to lower the rotation of the motor 67. Conversely, if the peak of the particle size distribution is smaller than the set value, the degree of grinding is high. Since this means that the rotational speed of the rolls is slow, a signal is generated from the CPU 88 and a drive signal is given from the drive circuit 89 to increase the rotation of the electric motor 67, thereby stably operating the crusher at a predetermined degree of crushing. It is something that can be maintained.

〔Effect of the invention〕

The crushing adjustment device for a crusher according to the present invention includes a measuring device for determining the degree of crushing attached to the crushing machine, and the rotational speed of the crushing roll is adjusted based on the output signal of this measuring device, thereby controlling the various properties of the crushed material. Regardless of differences in characteristics, a predetermined degree of grinding can always be stably maintained. In addition, in the crushers used for flour milling, the degree of crushing is determined in stages and the degree of crushing is determined in stages, so each crusher requires more accurate control of the degree of crushing. It is easy to operate the machine appropriately, and it is possible to efficiently mass-produce high-quality crushed material at all times.

[Brief explanation of the drawing]

FIG. 1 is a flowchart of the milling process showing one embodiment of the present invention, FIG. 2 is a side sectional view of a crusher, FIG. 3 is an embodiment of a measuring device for determining the degree of grinding, and FIG. The figure is the control circuit diagram,
FIG. 5 is a measuring device and a circuit diagram for determining the degree of grinding according to another embodiment. 1...Crusher, 2...Crusher, 3...Crusher, 4
... crusher, 5... sieve sorter, 6... sieve sorter,
7... Sieve sorter, 8... Cyclone, 9... Air lock valve, 10... Valve, 11... Measuring device, 12... Large particle discharge port, 13... Medium particle outlet, 14...Small particle outlet, 15...Cyclone, 1
6...Air lock valve, 17...Valve, 1
8... Measuring device, 19... Large particle outlet, 20...
Medium particle discharge port, 21...Small particle discharge port, 22...Nike ON, 23...Cyclone, 24...Air lock valve, 25...Valve, 26...Measuring instrument ,
27...Large particle outlet, 28...Medium particle outlet, 2
9...Small particle outlet, 30...Cyclone, 32.
...Blower, 33...Cyclone, 34...Blower, 35...Cyclone, 36...Bag filter, 37...Air lock valve, 38...Air...
Lock valve, 39...Air lock valve, 4
0... Air lock valve, 41... Air lock valve, 42... Tank, 43... Tank, 4
4... Tank, 45... Solenoid, 46... Supply tube, 47... Load cell, 48... Supply tank,
49...Discharge port, 50...Solenoid, 51...
Shutter, 52, subassembly, 53... sieve sorting machine, 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...
Main shaft pulley, 65 Main shaft gear, 66 Subshaft gear, 67 Main motor, 68 Drive pulley, 69
...Transmission device, 70... Supply hopper, 71...
Machine frame, 72... Feeding 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
... Specific diaphragm control circuit, 85... Drive circuit, 86...
CCD camera, 87...A/D, D/A converter 88...CPU, 89...drive circuit.

Claims (3)

[Claims] (1) In a crusher equipped with a pair of rolls that rotate at different rotation speeds and are rotatable in opposition to each other, and a transmission device is installed on the drive side to drive the pair of rolls in conjunction with each other, a measuring device for determining the degree of crushing is used. A grinding degree adjusting device for a grinding machine, characterized in that the grinding degree adjusting device is attached to the grinding machine and communicates an output signal of the measuring device to the transmission device via a control device. (2) The grinding degree adjusting device for a grinding machine according to claim (1), wherein the measuring device comprises a grain size sorter and a weighing scale for sorting the crushed particles by size to determine the degree of crushing. (3) The grinding degree adjusting device for a crusher according to claim (1), wherein the measuring device determines the grinding degree by measuring the projected area of the crushed grains.