JP2655022B2 - Vertical crusher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical grinding machine for grinding raw materials such as limestone, slag, clinker, cement raw material and chemicals by cooperation of a rotary table and a grinding roller.

[0002]

2. Description of the Related Art As a kind of pulverizer for finely pulverizing raw materials such as limestone, slag, and cement raw material into powders,
As shown in the figure, a vertical pulverizer 1 having a rotary table and a pulverizing roller is widely used. This type of crusher includes a disk-shaped rotary table 3A that is driven by a speed reducer 2 by a motor 2A at a lower portion of a cylindrical casing 15 and rotates at a low speed. And a plurality of crushing rollers 4 that are driven to rotate by being pressed by the like.

The crushing roller 4 is connected to a piston rod 10 of a hydraulic cylinder 9 via an arm 5 and an arm 7 which are pivotally supported on a casing 15 by a shaft 6 so that the crushing roller 4 is actuated. The crushing roller 4 is pressed on the rotary table 3A to apply crushing pressure to the raw material. 3B is a dam ring provided on the outer peripheral edge of the rotary table 3A for adjusting the layer pressure of the raw material, 14 is an annular space passage for gas blowing around the rotary table 3A, 14A is a gas supply path, and 13 is a raw material pulverized by the blade 13A. A rotary separator for classification, 16 is an outlet for taking out the product together with the gas, and 17 is a raw material input chute. In addition, 140 is a vibrometer attached to the casing 15.

In such a vertical pulverizer, the raw material supplied to the center of the rotary table by the raw material charging chute 17 receives the centrifugal force in the table radial direction by the rotation of the rotary table 3A and slides on the rotary table 3A. When a force in the rotating direction is received by the rotating table 3A,
A slides with A and makes a rotation somewhat slower than the rotation speed of the turntable 3A. The above two forces, that is, the force in the radial direction and the force in the rotational direction are synthesized, and the raw material is
A moves to the outer periphery of the turntable 3A in a spiral locus on A. Since a roller is pressed against this outer peripheral portion and rotated, the raw material describing the spiral enters the crushing roller 4 and the rotary table 3A from a direction forming an angle with the roller axis direction and is caught. Rarely crushed.

On the other hand, a gas such as air or hot air is guided to the base of the casing 15 by a duct.
This gas blows up from the annular space 14 between the outer peripheral surface of the turntable 3A and the inner peripheral surface of the casing, so that the pulverized fine powder accompanies the gas and the casing 1
5, the blades 1 of the separator 13 located above.
The product having the predetermined particle size is subjected to the classification action by 3A, and is discharged together with the gas from the outlet 16 and sent to the next step.

[0006]

In the conventional vertical crusher as described above, a considerable amount of the material to be crushed on the table that has reached the crushing side of the crushing roller is caught by the crushing roller. It is normal to be washed away into the annular space without being swept away. Of the objects to be crushed, which have been flushed into the annular space at the biting side of the crushing roller, those having a large particle diameter become stones, fall down the annular space, increase the amount of stones removed, and reduce the amount of processing work. Increase. In addition, among the objects to be crushed that have been washed away into the annular space, those having a small particle size are scattered again, so that the load applied to the separator increases and the classification efficiency is likely to decrease. Further, a large amount of the material to be crushed is flushed into the annular space, so that the ventilation pressure loss in the annular space increases, thereby increasing the fan power.

Also, in order for the raw material dropped on the rotary table 3A of the crusher to be successfully brought into contact with the crushing roller 4 and to be bitten, the raw material needs to have an appropriate coefficient of friction, and the surface is smooth and smooth. In the case of a raw material having a property and a small friction coefficient, even if the crushing roller 4 is strongly pressed toward the rotary table 3A, the raw material interposed between the two cannot escape to the side and cannot give an effective crushing force to the raw material. Such a raw material having a small wear coefficient generally contains a small amount of water. Therefore, the wear coefficient must be increased by adjusting the water content of the raw material to an appropriate value in advance. Of these raw materials with low moisture content and low friction coefficient, especially when ultrafine grinding is performed on raw materials having relatively poor grindability, mill vibration often occurs frequently and the vibration value (amplitude) increases. In particular, when the size is large, the equipment may be damaged or become inoperable, and the operation may be stopped without stopping.

For this reason, as a countermeasure against large vibrations, the height of the table (weir) (dam ring height), It is conceivable to change the crushing pressure and the number of table rotations by manipulating them. Of these methods, changing the driving device of the rotary table makes the equipment cost too large, making it less feasible, and reduces the table weir height (dam ring height). In addition, changing the grinding process requires internal work after stopping the operation of the crusher, and changing the crushing pressure has the disadvantage of changing the product particle size to the desired value. The fact was that they were responding, spoiling a stable production plan. Therefore, even if mill vibration occurs, the frequency of the pulverized raw material layer is changed to reduce the vibration amplitude without greatly lowering the mill throughput, and it is possible to quickly return to the normal stable operation mode with small vibration. Means were craving. These vibrations tended to occur more frequently in the fine or ultra-fine grinding than in the medium grinding region.

[0009]

In order to solve the above-mentioned problems, a rigid pulverizer according to the present invention has a plurality of rotatable pulverizing rollers arranged on an upper surface of an outer peripheral portion of a rotary table and supplies the rotatable pulverizing roller to a central portion of the rotary table. The raw material from the raw material hopper is crushed between the upper surface of the rotary table and the peripheral surface of the crushing roller by applying a predetermined crushing pressure to the crushing roller, and the vibrometer is mounted on the casing. In addition to the constant feed ware for transporting to the machine, the constant feed ware includes a moisture meter for measuring the moisture content of the raw material during transport, a water sprinkler, and a flow control valve for adjusting the water sprinkling amount. And the moisture measurement
The device is arranged downstream of the raw material flow of the sprinkler, and when the indicated value of the vibrometer exceeds a preset value or when the measured value of the moisture meter is set to a preset value range. A vertical pulverizer equipped with a control device for changing the amount of water sprayed when detached was used.

[0010]

In the vertical crusher of the present invention, the vibration value (amplitude) measured by the vibrometer attached to the casing of the vertical crusher and the moisture meter of the transport raw material provided in the constant feedware are used. The measured moisture content is converted into an electric signal every moment and transmitted to the control unit, and compared with the preset vibration value and moisture content value by the comparator inside the control unit, and exceeds or exceeds the appropriate vibration value. When the water content is out of the range, the controller issues a command to control the amount of water sprayed on the raw material by increasing or decreasing the amount of water sprayed by the sprayer disposed above the constant feedware. By feeding the raw material adjusted to the proper moisture content into the pulverizer in this way, the conventional pulverization conditions are changed to reduce the mill vibration and return to a stable operation.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 show a vertical pulverizer according to an embodiment of the present invention. FIG. 1 is a flow sheet, FIG. 2 is a control block diagram of a humidity control device and a control device, and FIG. 3 is a control system diagram. In the figure, 1 is a vertical crusher, 60 is a raw material conveyor, 70 is a raw material hopper, 80 is a constant feed ware, 80a is a variable speed electric motor of the same type, 90 is a dust collector, 100 is a suction fan, and 110 is crushed stone. Conveyor, 12
0 is a bucket elevator, 130 is a humidity controller, and the humidity controller 130 is a moisture meter 132, a flow control valve 136,
It comprises a spray device (sprinkler) 138. Also,
Reference numeral 150 denotes a control device connected to the vibrometer 140 and the moisture meter 132 by electric wiring. As shown in FIG. 2, a setter, a comparator, a controller (controller and operation device), and an amplifier are housed therein. Have been. Each device of the main body of the vertical crusher 1 is as described in the related art, and the description is omitted.

Next, the humidity controller 130 and the controller 15
The operation of 0 will be described. As shown in FIG. 2, the vibrometer 140 is measured every time interval set by the timer.
The measurement result of the moisture meter 132 is converted into an electric signal and input to the control device 150. The two information (the vibration value and the raw material-containing moisture) are compared with a set value previously input to the set unit by a comparator. If the set value is out of the range of the set value, the spray device is connected via the controller. The amount of water supply is increased or decreased by adjusting the valve opening of the flow control valve 136 or the variable speed motor 80a of the constant feed ware 80. The set values include the reference vibration level and the appropriate raw material water content range (0.8 to 3 for limestone).
%, For clinker and slag, 0.5 to 2%), and the rated raw material supply amount (rated rotation speed). The controller is composed of a controller and an operating device. The controller instructs the range of increase or decrease of the watering rate according to the way the measured value of the water content exceeds the set value. (P operation), integration operation (I operation), differentiation operation (D operation), proportional integration operation (PI operation), proportional differentiation operation (PD operation), etc.
It can be used properly according to the situation of the change of the raw material moisture. In addition to the above, the controller also has a role of indicating a width of decreasing the raw material supply amount in accordance with how the measured value exceeds the set value of the vibration.

The operating device transmits an operation command to the flow regulating valve 136 and the variable speed motor 80a based on the instruction from the controller. The line with the arrow in the figure indicates the signal flow.

The flow of the control system of these control devices 150 is as shown in FIG. In other words, the vibration value and the moisture content of the raw material are measured at the time intervals instructed by the timer during operation, and when the measured vibration value is larger than the reference vibration level (for example, a half amplitude of 50 μm), the dispersion is performed when the moisture content of the raw material is lower than the set range. Increase the amount of water and decrease the amount of water spray when it is higher than the set range. When the vibration level is high even though the water content is within the appropriate range, the amount of raw material supplied is reduced to avoid this situation. To maintain the moisture content as before. Also, when the raw material supply amount is less than the rated value when the vibration level is within the reference level, the raw material supply amount is increased, but also at this time, the water spray amount is increased by an amount corresponding to the fluctuation so that the moisture content does not fluctuate.

In this way, after a certain period of time elapses by the timer after the operation is changed, the vibration value and the moisture meter
The measured value is compared with the set value, and when the set value is exceeded, the above operation is repeated. For example, the set value of the moisture is preferably set to have a range of 0.8 to 3% for limestone pulverization and 0.5 to 2% for low moisture such as clinker and slag. It is. As the moisture meter 132, a commercially available laser emission type can be used. Moisture content up to 3% can be sufficiently dried by the heat of crushing or the heat of raising the temperature of the suction fan. If the water content is more than 3%, the pulverization efficiency will be worse.
%. The moisture meter 132 can use a moisture meter of an infrared reflection type or an infrared transmission type, for example, based on the principle that a specific wavelength of light is absorbed by moisture.

By performing the automatic control having the feedback mechanism as described above, the vibration value suddenly increases, or the moisture content of the feed material suddenly decreases (or increases) during operation, and the grinding efficiency decreases. Even if the vibration value increases due to the deterioration or biting, the above operation improves the raw material supply amount and the raw material moisture, and the raw material bite is improved again due to the increase in the friction coefficient. Can be returned to the stable operation state.

[0017]

As is apparent from the above description, in the vertical pulverizer of the present invention, the water content of the raw material is maintained at a predetermined appropriate value by spraying water by the spray device, thereby crushing the raw material. It is possible to maintain good engagement with the roller. Therefore, the grinding efficiency is improved,
The occurrence of abnormal vibration can be suppressed, and the product can be prevented from being coarsened and its performance reduced. If the water content of the raw material is appropriate and the vibration is suddenly increased for other reasons, the operation is continued by temporarily lowering the raw material supply and the vibration value falls within the specified range. Since the raw material supply amount can be automatically restored, long-term continuous stable operation can be continued, thereby improving maintainability.

[Brief description of the drawings]

FIG. 1 is a flow sheet of a vertical crusher showing an embodiment of the present invention.

FIG. 2 is a control block diagram of a humidity control device and a control device of the vertical pulverizer according to the embodiment of the present invention.

FIG. 3 is a control system diagram of a vertical mill according to an embodiment of the present invention.

FIG. 4 is an overall vertical sectional view of a conventional vertical crusher.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical grinder 3A Rotary table 4 Grinding roller 17 Raw material input chute 60 Raw material conveyor 70 Raw material hopper 80 Constant feed wear 80a Variable speed motor 90 Dust collecting device 100 Suction fan 110 Stone discharging conveyor 120 Bucket elevator 130 Humidity control device 132 Water Measuring instrument 136 Flow control valve 138 Spray device (sprinkler) 140 Vibrometer 150 Control device

Claims (1)

(57) [Claims] 1. A plurality of rotatable crushing rollers are disposed on the upper surface of an outer peripheral portion of a rotary table, and a raw material supplied to a central portion of the rotary table is applied with a predetermined crushing pressure to the crushing roller to rotate the upper surface of the rotary table and the crushing roller. Crushed between the surface and
A rigid crusher with a vibrometer attached to the casing, equipped with a constant feed ware for transporting the raw material from the raw material hopper to the crusher, and a moisture meter, water sprinkler, and water sprinkler for measuring the moisture content of the raw material during transportation. A humidity control device comprising a flow control valve for adjustment is provided in the constant feedware , and the moisture meter is
It is arranged on the downstream side of the raw material flow of the vessel, and when the indicated value of the vibrometer exceeds a preset value, or when the measured value of the moisture meter deviates from a preset value range. A vertical crusher equipped with a control device for changing the amount of water spray.