JP2673844B2 - Automatic operation method of 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 an automatic operation method of a vertical crusher for crushing raw materials such as limestone, slag, clinker, cement raw materials and chemicals in cooperation with a rotary table and a pulverizing roller.

[0002]

2. Description of the Related Art As one type of crusher for finely pulverizing raw materials such as limestone, slag, and cement raw materials into powder, FIG.
As shown in FIG. 1, a vertical pulverizer 1 having a rotary table and a pulverizing roller is widely used. This kind of crusher is
A disk-shaped rotary table 3A, which is driven by the speed reducer 2 by the constant speed motor 2K and is rotated at a low speed at the lower portion of the cylindrical casing 15, is pressed against a portion equally dividing the outer peripheral portion of the upper surface in the circumferential direction by hydraulic pressure or the like. And a plurality of crushing rollers 4 that are driven and rotated.

The crushing roller 4 has a rotating shaft 6
The arm 5 is pivotally supported by an arm 5 and is connected to a piston rod 10 of a hydraulic cylinder 9 via an arm 7. By operating the hydraulic cylinder 9, the grinding roller 4 is pressed onto the rotary table 3 </ b> A. To give the grinding pressure to the raw material. 3B is a dam ring provided on the outer periphery of the rotary table 3A to adjust the thickness of the raw material layer, 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 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 guguto.
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, in order for the raw material dropped onto 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 is required. In the case of a material having a small friction coefficient and a smooth and smooth surface, even if the grinding roller 4 is strongly pressed against the rotary table 3A, the material interposed therebetween is not The material cannot escape to the side and give effective crushing power to the raw material. Raw materials with a low wear coefficient generally contain little moisture,
The wear coefficient must be increased by adjusting the moisture content of the raw material to an appropriate value in advance. Among such raw materials with low moisture content and low coefficient of friction, especially when ultrafine grinding is performed on raw materials having relatively poor grindability,
Mill vibration often occurs frequently, and when the vibration value (amplitude) is particularly large, the equipment may be damaged or become inoperable, and the operation may be stopped without stopping.

As described above, during the operation, the mill vibration value becomes much larger than the normal value of the half amplitude of 50 μm, and when this state continues, some measures are taken to reduce the mill vibration value immediately. There must be. As measures for this, for example, countermeasures such as temporarily reducing the amount of raw material supplied to the crusher, increasing the amount of air flowing through the mill, adding water to the raw material, and stopping the operation of the mill have been taken. . However, a decrease in the supply of raw materials and a stoppage of the mill operation lead to a decrease in the processing capacity. An increase in the amount of air flow through the mill results in a coarsening of the product particle size, resulting in a decrease in the product quality. All of these have a secondary adverse effect, for example, resulting in deterioration of product quality. In the method of the present invention, even if a large vibration is generated during operation, an operation to reduce the large vibration is automatically and simply performed by remote control.

[0008]

In order to solve the above problems, in the method for automatically operating a vertical crusher according to the present invention, a variable speed constant feed ware equipped with a weighing machine for transporting raw materials is used. And a plurality of rotatable crushing rollers arranged on the upper surface of the outer periphery of the rotary table, and a hydraulic means for pressing the crushing rollers against the rotary table. A vertical crusher that crushes between the crushing roller and the peripheral surface,
The casing is equipped with a vibrometer and is equipped with a bed thickness gauge for measuring the material bed thickness between the rotary table and the crushing roller during operation. The hydraulic pressure of the hydraulic means is changed to adjust the supply amount of the constant feed ware. In a vertical crusher equipped with a control device that increases and decreases, the indicated values of the vibrometer and layer thickness meter, which are measured every moment during operation, are compared with preset values, and the oil pressure of the hydraulic means and the constant feed The vertical crusher was automatically operated by adjusting the raw material supply amount of the ware according to the operation procedure of each of the following steps. The indicated value of the vibrometer is compared with the set value, and when the indicated value is larger than the set value, the indicated value of the layer thickness meter is compared with the set value (the proper range of the raw material layer thickness) to set the raw material layer indicated value. When the value is below the value, the first step of decreasing the oil pressure according to the degree is greater than the set value of the vibrometer, and when the raw material layer thickness indication value is above the set value, the oil pressure is reduced according to the degree. 2nd step to increase the pressure When the indicated value of the vibrometer is larger than the set value and the raw material layer thickness indicated value is within the set range, the 3rd step to decrease the feed rate of the raw material is less than the set value. Is smaller than the rated feedstock feed rate and the raw material feedrate is less than the set value. Maintains the current hydraulic pressure and raw material supply when the rated raw material supply is exceeded The fifth step to do

[0009]

In the automatic operation method of the vertical crusher of the present invention, the vibration value measured by the vibrometer attached to the casing of the vertical crusher and the raw material layer thickness between the rotating table and the crushing roller during operation are measured. The measured value of the layer thickness gauge to be compared with the preset vibration value and reference layer thickness value (reference layer thickness range),
When the vibration exceeds the appropriate vibration value or deviates from the reference layer thickness range, a command is issued by the control device to change the hydraulic pressure of the hydraulic means of the crushing roller to prevent the occurrence of vibration due to the inadequate raw material layer thickness. Suppress and calm. Moreover, although the material layer thickness is within the proper range, when the vibration level is higher than the set value, it is unavoidable to temporarily reduce the raw material supply amount, but if the vibration falls below the reference value, the raw material supply amount increases. Then it returns to the original state.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 show a vertical pulverizer according to an embodiment of the present invention, FIG. 1 is a flow sheet, FIG. 2 is a block diagram of a control device, FIG. 3 is a control system diagram, and FIG. It is a longitudinal section for outline explanation. In the figure, 1 is a vertical crusher, 2A is a variable speed electric motor for driving a rotary table, 60 is a raw material conveyor, 70 is a raw material hopper, 80 is constant feed ware, 80a is a variable speed electric motor for the same, and 80b is the same.
Is a constant feed ware 80 weighing machine, 90 is a dust collector, 100 is a suction fan, 130 is a layer thickness gauge, 14
0 is a vibrometer, 150 is a control device, and the control device 150
As shown in FIG. 2, a setter, a controller (regulator and operator), and an amplifier are housed inside. Vertical crusher 1
Each device of the main body is as described in the related art, and its description is omitted.

Next, the layer thickness meter 130 will be described. As shown in FIG. 4, the movement of the pulverizing roller 4 which moves up and down in response to a change in the material layer thickness that fluctuates during operation is rotated about the rotation axis 6. The displacement is measured by a layer thickness gauge 130 to which a differential transformer is applied, for example, as a displacement converter. That is, as shown in the figure, a core C made of a magnetic material is inserted between the primary coil E and the secondary coils A and B, and a constant AC voltage E _P is excited in the primary coil A, When the arm 5 and the rod R are connected and moved forward and backward, the reactance with respect to the secondary coil A and the secondary coil B changes due to the movement of the core C, and a difference occurs between the induced voltages E _A and E _B of the two. The output potential difference E _O is obtained, and the displacement of the core C can be measured from this.

Next, the operation of the control device 150 will be described. As shown in FIG. 2, the vibrometer 140 and the layer thickness meter 130, which are measured at every time interval set by the timer,
The measurement result of the weighing machine 80b is converted into an electric signal and input to the control device 150. The three pieces of information (vibration value, raw material layer thickness, and raw material supply amount) are compared with set values input to the setter in advance by a comparator. The hydraulic unit (not shown) of the hydraulic cylinder 9 (shown in FIG. 5) is controlled via the controller to increase or decrease the pressing force (oil pressure) of the crushing roller 4. The set values include the reference vibration level, reference material layer thickness, and rated speed (variable speed motor for constant feed wear drive). The controller is composed of a controller and an operating device. The controller indicates the range of increase and decrease of the hydraulic pressure of the hydraulic cylinder 9 according to the difference between the measured value of the vibration value or the raw material layer thickness and the set value. The control operation includes proportional operation (P operation), integration operation (I operation), differentiation operation (D operation), proportional integration operation (PI operation), proportional differentiation operation (PD operation), etc. Can be used properly depending on. 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 operation unit transmits an operation command to the hydraulic unit and the variable speed electric 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. That is, the vibration value and the raw material layer thickness are measured at the time interval designated by the running timer, and when the measured actual vibration value is larger than the reference vibration level (for example, one-sided amplitude is 50 μm), when the raw material layer thickness is lower than the set range, Decrease the pressure and increase the hydraulic pressure when it is higher than the set range. When the vibration level is high even though the raw material layer thickness is within the appropriate range, the raw material supply amount is temporarily reduced to avoid this situation. When the vibration level is within the reference level and the raw material supply amount is less than the rated value, the raw material supply amount is increased.

After changing the operation in this way, after a lapse of a certain time by the timer, the vibration value by the vibrometer 140 and the raw material layer thickness measured value by the layer thickness meter 130 are compared again with the set value, and the set value is exceeded. Sometimes the above-mentioned operation is repeated.
The set value of the vibration value is about 50 μm per side amplitude, and the set value of the raw material layer thickness depends on the type of raw material, the model number of the crusher, and the product grain size, and cannot be determined in a general way. The coarser the grain size, the greater the set layer thickness. It is advisable to grasp the situation based on operation results and test runs and select an appropriate value.

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 poor biting, the raw material supply amount and the raw material layer thickness are improved by the above operation, and the raw material biting is improved again to maintain the stable operation. You can return to the state.

[0017]

As is apparent from the above description, according to the method of the present invention, even if the vibration value becomes large due to some cause during operation, the rotary table of the crushing roller is automatically and remotely operated. The pressing force can be adjusted to change the raw material layer thickness, or the raw material supply amount can be temporarily reduced to suppress the vibration. In addition, after the vibration falls within the specified range, the raw material supply amount is automatically restored, so that the reduction of crushing efficiency is prevented, continuous long-term stable operation is possible, and the maintainability and production efficiency are improved.

[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 a schematic explanatory diagram of a layer thickness gauge according to an embodiment of the present invention.

FIG. 5 is an overall vertical sectional view of a conventional vertical crusher.

[Explanation of symbols]

 1 Vertical Grinder 2 Reducer 2A Electric Motor 2B Controller 3A Rotary Table 4 Grinding Roller 5 Arm 6 Rotating Shaft 15 Casing 60 Raw Material Conveyor 70 Raw Material Hopper 80 Constant Feed Ware 80a Variable Speed Electric Motor 80b Weighing Machine 90 Dust Collector 100 Suction Fan 130 layer thickness meter 140 vibrometer 150 controller A secondary coil B secondary coil C core E primary coil R rod

Claims (1)

(57) [Claims] 1. A variable speed constant feed ware equipped with a weighing machine for transporting raw materials, wherein a plurality of rotatable crushing rollers are arranged on an upper surface of an outer peripheral portion of the rotary table, and the crushing rollers are adapted to the rotary table. A vertical crusher equipped with a hydraulic means for pressing to the center of the rotary table to crush the raw material supplied between the upper surface of the rotary table and the peripheral surface of the crushing roller. A vertical crusher equipped with a layer thickness gauge for measuring the raw material layer thickness between the rotary table and the crushing roller, and a controller for changing the oil pressure of the hydraulic means to increase or decrease the supply amount of the constant feed ware. In the above, the indicated values of the vibrometer and the layer thickness gauge, which are measured every moment during operation, are compared with preset values, and the hydraulic pressure of the hydraulic means and the constant feed wear are compared. The automatic operation method of the vertical crusher which adjusts the raw material supply amount according to the operation procedure of the following steps. The indicated value of the vibrometer is compared with the set value, and when the indicated value is larger than the set value, the indicated value of the layer thickness meter is compared with the set value (the proper range of the raw material layer thickness) to set the raw material layer indicated value. When the value is below the value, the first step of decreasing the oil pressure according to the degree is greater than the set value of the vibrometer, and when the raw material layer thickness indication value is above the set value, the oil pressure is reduced according to the degree. 2nd step to increase the pressure When the indicated value of the vibrometer is larger than the set value and the raw material layer thickness indicated value is within the set range, the 3rd step to decrease the feed rate of the raw material is less than the set value. Is smaller than the rated feedstock feed rate and the raw material feedrate is less than the set value. Maintains the current hydraulic pressure and raw material supply when the rated raw material supply is exceeded The fifth step to do