JP2711775B2 - 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 one type of crusher for finely pulverizing raw materials such as limestone, slag, and cement raw material 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, the amount of the raw material supplied into the crusher depends on the inlet pressure and the outlet pressure of the gas introduced into the vertical crusher. The differential pressure was controlled to be constant, and was independent of the thickness of the raw material layer on the rotating table during operation. However, in a vertical mill, there is a close relationship between the type of raw material to be ground and the amount of raw material supplied, the tension hydraulic pressure of the grinding roller, and the thickness of the raw material layer on the rotary table. In order to perform the operation in a better pulverization state, it is efficient to always use the motor for driving the rotary table in the vertical pulverizer at the rated output. At the same time, it is important to pulverize the raw material with a layer thickness suitable for the raw material. For this purpose, the proximity switch used to detect the upper and lower positions of the conventional pulverizing roller requires a pulverizing device in the middle area. It was difficult to capture the state, that is, the ever-changing raw material layer thickness. Further, even if the thickness of the raw material layer can be captured every moment, the technology for automatically controlling the pulverized state using the information has not been sufficiently established.

[0007]

In order to solve the above-mentioned problems, a vertical pulverizer according to the present invention is provided with a variable speed constant feed ware having a weighing machine for transporting raw materials, and a rotary crusher. A plurality of rotatable crushing rollers are arranged on the upper surface of the outer peripheral portion of the table, and a hydraulic cylinder is provided for pressing the crushing roller against the rotating table. A vertical grinding machine for grinding between the rotating table and a grinding roller during operation, comprising a laser displacement meter for measuring the thickness of the raw material layer between the rotating table and the grinding roller, wherein a motor for driving the rotating table is a variable speed motor; When the indicated value of the electric power value exceeds a predetermined range, the supply amount of the raw material is changed, and when the indicated value of the laser displacement meter deviates from a predetermined range, the hydraulic cylinder is changed. And configured to include or to change the hydraulic force or programmable operating device for changing the rotational speed of the variable speed electric motor.

[0008]

In the vertical crusher of the present invention, the value measured by the laser displacement meter provided for detecting the amount of movement of the piston rod of the hydraulic cylinder is sent to the programmable operation device every moment, and the preset matching of the crushed raw material is performed. When the measured value is within the range of the raw material layer thickness, the operation is continued as it is. When the raw material layer thickness deviates from the set range, an operation command is issued to the hydraulic unit to automatically change the tension hydraulic pressure of the crushing roller. Return the raw material layer thickness to within the set range. With it
By giving a command to the programmable controller, the amount of raw material supplied is increased when the crusher has enough power, and conversely, the amount of raw material supplied is reduced in the case of overload, thereby maintaining proper operation in accordance with the capacity of the crusher. You can also.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 5 relate to an embodiment of the present invention.
1 is a flow sheet of a vertical crusher, FIG. 2 is a control block diagram of the vertical crusher, FIG. 3 is a control system diagram of the vertical crusher, FIG. FIG. 5 is a principle diagram of the laser displacement meter.

In the drawing, 1 is a vertical mill, 2A is a variable speed motor for driving a rotary table, and 2B is a variable speed motor 2
Controller A, 9A is a hydraulic unit of the hydraulic cylinder 9 for tensioning the crushing roller 4, 60 is a raw material conveyor, 70
Is raw material hopper, 80 is constant feed wear,
80a is the same variable speed motor, 80b is a weighing machine of the constant feedware 80, 90 is a dust collector, 100 is a suction fan, 130 is a laser displacement meter, 150 is a programmable operation device, and 150 is a programmable operation device. As shown in FIG. 2, a comparator, a setting device, a controller (a controller and an operating device), and an amplifier are housed therein. Each device of the main body of the vertical crusher 1 is as described in the prior art, and the description thereof will be omitted.

Next, a description will be given of the laser displacement meter 130. As shown in FIGS. 4 and 5, a measuring plate 90 is fixed to a piston rod 9a of a hydraulic cylinder 9 connected to the crushing roller 4 via a support. A laser displacement gauge 130 is attached to the side surface of the hydraulic cylinder 90 so as to face the measuring plate 90, and a distance A corresponding to the raw material layer thickness B that changes every moment is measured. FIG. 5 shows the principle of the laser displacement meter 130. The laser light from the light source of the sensor section is obliquely incident on the measuring plate 90, is reflected on the surface of the measuring plate 90, and then passes through the condensing lens. An image is formed on the sensor. The image formed on the image sensor also moves in accordance with the position of the measurement plate moving in the measurement range W. This is caught by the image sensor driver and sent to the display unit in the form of an electric signal, and the digital or analog output signal is programmable. It is transmitted to the operation device 150.

Next, the operation of the programmable controller 150 will be described. As shown in FIG. 2, the measurement results of the variable speed electric motor wattmeter 2C for mill and the laser displacement meter 130, which are measured every time interval set by the timer, are converted into electric signals and input to the programmable controller 150. You. These two information (power value and raw material layer thickness) are compared with a set value input to the setter in advance by a comparator, and if the set value is out of the range, it is crushed via the controller. The power value and the thickness of the raw material layer are improved by changing the oil pressure applied to the rollers, and then the rotation speed of the rotary table 3A is reduced by controlling the rotation speed of the variable speed motor 2A. The reference power value and reference material layer thickness are set in the set values. The controller is composed of a controller and an operating device. The controller adjusts the tension and the speed of the variable speed motor for driving the constant feed wear according to the difference between the set value and the measured value of the electric power value or raw material layer thickness. It instructs the range of increase / decrease of the number of revolutions of the variable speed motor for driving the rotary table (for the mill). 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.
It can be used properly according to the situation of the change of the raw material moisture. The raw material supply amount is obtained by integrating the measured values of the weighing machine 80b of the constant feed ware 80 in units of time. The above reference power value and reference material layer thickness are 1
Instead of a point, it may have a certain width.

The operating device transmits an operation command to the hydraulic unit 9A or the variable speed motor 2A or the variable speed motor 80a based on an instruction from the controller. The line with the arrow in the figure indicates the signal flow.

The flow of the control system of the programmable controller 150 is as shown in FIG. That is,
The power value, the raw material layer thickness and the raw material supply amount of the variable speed electric motor 2A for the mill are measured at the time intervals designated by the timer during operation, and when the power value is smaller than the reference power value, the raw material supply amount is increased and In order to maintain a suitable raw material layer thickness, the rotation speed of the variable speed motor 2A for the mill is increased. Conversely, when the power value exceeds the reference power value and is overloaded, the raw material supply amount is reduced, and the rotation speed is also reduced. After the power value is confirmed to be within an appropriate range, when the raw material layer thickness is lower than the set range, the tension hydraulic pressure and the number of rotations of the rotary table are reduced to return the raw material layer thickness to an appropriate range. When the raw material layer thickness is too high, the tension hydraulic pressure is increased. When the raw material layer thickness is still high, the rotating table is accelerated to reduce the raw material layer thickness. When the raw material layer thickness is within the set range and the electric power value is also appropriate, the operation is continued as it is.

In this way, after the operation is changed, after the elapse of a certain time by the timer, the electric power value and the laser displacement
The measured value of the raw material layer thickness according to 0 is compared with the set value, and when the set value is exceeded, the above operation is repeated. The set value of the power value is about ± 10% of the rated value, and the set value of the raw material layer thickness depends on the type of raw material, the model of the crusher, and the product particle size, and cannot be determined unconditionally. The set layer thickness increases as the crusher and the product particle size become coarser. 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 above-described feedback mechanism, the power value increases suddenly, or the water content of the feed material suddenly decreases (or increases) during operation, and the grinding efficiency decreases. Even if the milling vibrations increase due to poor biting, the above operation improves the raw material supply amount and the raw material layer thickness, and the raw material bite is improved again to maintain the stable operation. You can return to the state.

[0017]

As is apparent from the above description, in the vertical pulverizer of the present invention, the provision of the laser displacement meter and the programmable operation device increases the power value during operation and eventually causes the operation to become inoperable. In order to improve the raw material supply amount and the raw material layer thickness to appropriate values, the raw material supply amount, the hydraulic pressure of the crushing roller, and the number of revolutions of the rotary table are automatically changed to suppress the continuation of abnormal conditions, and Take measures such as changing the supply amount and tension hydraulic pressure to return to the original stable operation. Also, after the power value and raw material layer thickness fall within the specified range, the raw material supply amount is automatically restored to the original state, preventing a decrease in grinding efficiency, maintaining long-term continuous stable operation, and improving maintainability and production efficiency. Is 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 vertical mill according to an 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 vertical sectional view of a main part of a vertical pulverizer according to an embodiment of the present invention.

FIG. 5 is a principle diagram of the laser displacement meter according to the embodiment of the present invention.

FIG. 6 is an overall vertical sectional view of a conventional vertical crusher.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical grinder 2 Speed reducer 2A Variable speed motor 2B Controller 2C Power meter 2K Constant speed motor 3A Rotary table 4 Grinding roller 5 Arm 6 Rotating shaft 9 Hydraulic cylinder 9A Hydraulic unit 15 Casing 60 Raw material conveyor 70 Raw material hopper 80 Constant feed・ Ware 80a Variable speed motor 80b Weighing machine 90 Dust collector 100 Suction fan 130 Laser displacement meter 150 Programmable actuator

Claims (1)

(57) [Claims] A variable speed constant feed ware equipped with a weighing machine for transporting raw materials, a plurality of rotatable crushing rollers are arranged on an upper surface of an outer peripheral portion of a rotary table, and the crushing rollers are connected to the rotary table. A vertical crusher that has a hydraulic cylinder that presses the material between the rotary table and the crushing roller during operation. A laser displacement meter for measuring the layer thickness, a motor for driving the rotary table is a variable speed motor, and when the indicated value of the power value of the motor exceeds a predetermined range, the material supply amount is changed. A programmable actuator that changes the hydraulic pressure of the hydraulic cylinder or changes the rotation speed of the variable speed motor when the indicated value of the displacement meter deviates from a preset range. Vertical crusher comprising: