JP2002102742A - Operation controller of grinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent any reduction in reliability of a grinder in its continuous operation for a long period of time. SOLUTION: This controller is provided with: a color discrimination sensor 19 which is placed at a position above the end of the discharge side of a belt conveyor 2 for conveying a cement raw material 1 and capable of discriminating color of the cement raw material 1 from that of a belt 2a of the belt conveyor 2; and a control device 20 for providing a detection signal from the color discrimination sensor 19 to a drive motor 6 for driving a rotary table 8 of a roller mill 3 and a hydraulic unit 12 for controlling two hydraulic cylinders 9 so as to push both of two grinding rollers 10 on the rotary table 8 of the roller mill 3. The control procedure using the controller involves: when color of the cement raw material 1 is detected by the color discrimination sensor 19, driving the drive motor 6 so as to contract each of the hydraulic cylinders 9 and to subject the cement raw material 1 to grinding treatment; and when color of the belt 2a is detected by the color discrimination sensor 19, stopping the drive motor 6, and concurrently, extending each of the hydraulic cylinders 9 to stop the driving of the roller mill 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control device for a crusher that automatically switches between driving and stopping of the operation of the crusher in accordance with the presence or absence of a raw material supply. The present invention relates to an operation control device for a crusher that does not reduce reliability even if it is used.

[0002]

2. Description of the Related Art For example, in a cement manufacturing plant,
As one of the cement manufacturing processes, there is a process of first pulverizing a cement raw material into fine powders, and as a pulverizing equipment for performing the pulverizing process, as shown in FIG. Downstream of the belt conveyor 2 as a raw material transporting device for transporting the raw material 1, as a crusher, for example, at the lower part of a cylindrical casing 4 provided with an inlet 5 at the center of the top, via a speed reducer 7 by a drive motor 6. And a disk-shaped rotary table 8 driven at a low speed by rotation, and at a required circumferential position on a peripheral portion of the upper surface of the rotary table 8,
A pulverizing roller 10 which is pressed by the contraction operation of the hydraulic cylinder 9 and rotates following the rotation of the rotary table 8; As a configuration in which a vertical roller mill 3 having a coarse powder separator 11 for discharging only the body is installed, a rotary table 8 pressed into contact with a cement raw material 1 put into a casing 4 from a belt conveyor 2 and a grinding roller In some cases, the powder is pulverized to a particle size of 10 and then classified by a coarse powder separator 11 to discharge and collect only powder having a desired particle size. Reference numeral 12 denotes a hydraulic unit for extending and retracting the hydraulic cylinder 9.

[0003] In such a pulverizing facility, when the supply of the raw material from the raw material supply unit is stopped for some reason, the supply of the raw material to the roller mill 3 via the belt conveyor 2 is interrupted. Roller mill 3
If the rotary table 8 and the crushing roller 10 are continuously operated in a state where no raw material is supplied, that is, in an empty state, the rotary table 8 and the crushing roller 10 are operated in a state where they are directly pressed strongly. There is a risk of causing a serious failure such as damage to the device. Therefore, the belt conveyor 2
When the raw material supply to the roller mill 3 is not performed from
The operation of the roller mill 3 is automatically stopped, and when the raw material supply is restarted, the operation of the roller mill 3 is automatically restarted in order to avoid the stagnation of the cement raw material 1 put into the roller mill 3. It is desired to perform control such that

Conventionally, in order to detect the presence or absence of the supply of the cement raw material 1, the belt conveyor 2 has a shaft 15 as a center at a position near an upper end of a discharge side of the belt conveyor 2 on the roller mill 3 side. At the lower end of a swinging lever 14 that can swing in the conveying direction in a pendulum manner, a pendulum type bracket 13 is provided at the lower end of which is attached a plate 16 for contacting the raw material, and the plate 16 of the pendulum type bracket 13 contacts the raw material 1. The movement of the swinging lever 14 when it is moved to be transported to the downstream side is detected by a rotation sensor provided on the shaft 15 or a limit switch 17 for detecting the movement of the swinging lever 14, so that the belt conveyor 2 When the material 1 is detected on the belt conveyor 2, when the material 1 is not present on the belt conveyor 2, the plate 16 does not come into contact with the material 1, A state in which the raw material 1 is not present on the belt conveyor 2 is detected by maintaining a downward state like a line, and further, the movement of the pendulum type bracket 13 is detected. A controller 18 for sending control commands to the drive motor 6 and the hydraulic unit 12 in accordance with the detection signal is provided, and a signal which detects the movement of the pendulum bracket 13 from the limit switch 17 is input to the controller 18. In this case, it is determined that the supply of the cement raw material 1 is being performed, and a drive command is given to the drive motor 6 to drive it, and a contraction operation command is given to the hydraulic unit 12 to contract the hydraulic cylinder 9. Crushing of the cement raw material 1 between the crushing roller 10 and the rotating table 8 by operating the crushing roller 10 to press the rotating table 8 with pressure Can make it in,
On the other hand, when the limit switch 17 does not operate continuously for a certain period of time, it is determined that the supply of the cement raw material 1 has stopped, and the controller 18 gives a stop command to the drive motor 6 to stop the drive. At the same time, an extension operation command is given to the hydraulic unit 12 to extend the hydraulic cylinder 9,
By releasing the pressing state of the crushing roller 10 against the rotary table 8, the driving and stopping of the operation of the roller mill 3 can be automatically switched and controlled according to the presence or absence of the supply of the cement raw material 1. is there.

[0005]

However, in the conventional operation control device for a pulverizer, the plate 16 attached to the lower end of the lever 14 of the pendulum type bracket 13 is mounted on the belt conveyor 2.
If the cement 16 is constantly in continuous contact with the cement raw material 1 conveyed above, the plate 16 is worn by hard stones or the like contained in the cement raw material 1 when the continuous operation is performed for a long time. Since the level position of the lower end of the lever 14 becomes high, even if the cement raw material 1 is being conveyed on the belt conveyor 2, there is a possibility that the detection becomes impossible,
Further, since the pendulum type bracket 13 has a shaft 15 and a rotating portion, if the rotating portion becomes poor in sliding due to clogging of dust or the like, there is a possibility that the lever 14 is fixed in a tilted state. In this case, even if the supply of the cement raw material 1 is interrupted, it is erroneously recognized as if there is a raw material supply, and the operation of the roller mill 3 must be automatically stopped. Therefore, there is a possibility that the roller mill 3 may be damaged because it cannot be stopped.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an operation control device for a pulverizer in which there is no fear that constituent members are worn out and there is no rotating part, and the reliability does not decrease even after a long continuous operation. is there.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a belt conveyor for supplying raw materials to a pulverizer with a color of a belt of the belt conveyor at an upper position on a discharge side end thereof. A color identification sensor that can identify the color of the raw material is provided, and a controller that issues an operation start instruction or an operation stop instruction to the crusher in accordance with a detection signal from the color identification sensor is provided.

[0008] The raw material is conveyed by the belt conveyor,
When the raw material is supplied to the crusher, the color of the raw material present on the belt of the belt conveyor is detected by the color identification sensor, and the controller starts operation of the crusher based on the detection signal. When the command is given, the raw material is crushed. Next, when there is no raw material on the belt conveyor such as when the supply of raw material is stopped, the color of the belt is detected by the color identification sensor and the raw material is not detected. The operation of the crusher is stopped by giving an operation stop command to the crusher from the controller based on the detection signal, and therefore, it is automatically prevented that the crusher is continuously operated in an empty state. Become so. Next, when the supply of the raw material is restarted, the color of the raw material conveyed on the belt of the belt conveyor is detected again by the color identification sensor, so that the controller sends the color to the crusher in the same manner as described above. When the operation start command is given, the raw material crushing process is automatically restarted.

In addition, the color of the belt of the belt conveyor is black, and the color identification sensor is configured to be able to distinguish black from white or brown. It can be easily distinguished from the color of the material, which is advantageous for controlling the operation of a crusher for crushing the cement raw material.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of an operation control device of a crusher according to the present invention, and shows a case where the crusher is applied to operation control of a roller mill in a cement plant as a crusher.

That is, as shown in FIG. 2, a roller mill 3 is installed downstream of a belt conveyor 2 that conveys a cement raw material 1 from a raw material supply unit (not shown), as shown in FIG. The belt 2 of the belt conveyor 2 is located above the discharge side end of the belt conveyor 2.
a color discriminating sensor 19 capable of discriminating the color of the cement raw material 1 from the color of the cement raw material 1, based on a detection signal from the color discriminating sensor 19, whether the cement raw material 1 exists on the belt 2 a, It is determined whether or not the supply of the cement raw material 1 from the conveyor 2 to the roller mill 3 is performed,
The drive motor 6 of the roller mill 3 is
And a controller 20 for giving the hydraulic unit 12 a contraction operation instruction or an extension operation instruction to the hydraulic cylinder 9.

As the above-mentioned belt conveyor 2, usually, the color of the cement raw material 1 is mostly white or brown, so that a belt provided with a black belt 2a is used so that the color can be easily distinguished therefrom. As the color identification sensor 19,
A belt capable of distinguishing black of the belt 2a from white or brown of the cement raw material 1 is used.

The controller 20 includes a color identification sensor 19.
When a whiter or browner detection signal is sent, a drive command is issued to the drive motor 6 of the roller mill 3 and a contraction operation command is issued to the hydraulic unit 12 to contract the hydraulic cylinder 9. When a black detection signal is sent from 19, a stop command is issued to the drive motor 6 and an extension operation command is issued to the hydraulic unit 12 to extend the hydraulic cylinder 9. In addition, 2
Reference numeral 1 denotes a belt cleaner that is usually equipped to scrape off and remove deposits on the surface of the belt 2a on the return side of the belt conveyor 2.

When the cement raw material 1 is conveyed by the belt conveyor 2 and supplied to the roller mill 3, since the cement raw material 1 exists on the belt 2 a of the belt conveyor 2, the color identification sensor is used. 19 detects white or brown, and based on this detection signal, the controller 20
A drive command is given to the drive motor 6 to rotate the turntable 8, and a contraction operation command to the hydraulic cylinder 9 is given to the hydraulic unit 12 to cause the hydraulic cylinder 9 to contract. As a result, the crushing roller 10 is pressed against and driven by the rotating rotary table 8, so that the cement raw material 1 is crushed between the rotary table 8 and the crushing roller 10.

Next, when the supply of the cement raw material 1 from the raw material supply unit is stopped, the black color on the surface of the belt 2 a is detected by the color identification sensor 19 because the cement raw material 1 is no longer present on the belt conveyor 2. Based on this detection signal, a stop command is given from the controller 20 to the drive motor 6 to stop the rotation of the turntable 8, and an extension operation command to the hydraulic cylinder 9 is given to the hydraulic unit 12. Since the hydraulic cylinder 9 is extended, the pressing state of the crushing roller 10 against the rotary table 8 is eliminated, so that the roller mill 3 is automatically prevented from being operated in an empty state. .

Next, when the supply of the cement raw material 1 is restarted, the color of the cement raw material 1 conveyed on the belt 2a of the belt conveyor 2 is detected again by the color identification sensor 19, Controller 2 as above
0, an operation command is given to the drive motor 6 and a command is sent to the hydraulic unit 12 to contract the hydraulic cylinder 9 to push down the pulverizing roller 10, and the pulverizing process of the cement raw material 1 by the roller mill 3 is automatically restarted. Will be done.

As described above, the presence or absence of the supply of the cement raw material 1 to the roller mill 3 can be detected by the color identification sensor 19 on the belt 2a of the belt conveyor 2 in a non-contact manner. There is no problem of abrasion that occurs on the plate 16 and the color identification sensor 1
Since 9 has no rotating part, there is no danger of being affected by dust and the like, and it is possible to prevent the reliability from being lowered even by long-time continuous operation. At this time, the belt 2a on the return side of the belt conveyor 2 is
The surface of the belt 2a does not become whitish due to adhesion of powder of the cement material 1 to be conveyed, and the cement material 1 contains moisture. Since the belt surface does not become whitish, the belt 2
There is no fear that it becomes difficult to distinguish the color of a from the color of the cement raw material 1.

The present invention is not limited to the above-described embodiment. For example, an operation control device of the present invention is applied to an operation control of a roller mill 3 for pulverizing a cement raw material 1 in a cement plant. However, the belt conveyor 2 provided with a belt of a color that can be easily distinguished from the color of the object to be crushed according to the color of the object to be crushed is used, and the color identification sensor 19 suitable for the color to be identified is used. Is used, the present invention may be applied to the operation control of the roller mill 3 for crushing any object to be crushed. Further, the roller mill 3 is illustrated as a crusher. The present invention may be applied to the operation control of the mills. In this case, the control target of the operation start and stop by the controller may be set according to the pulverization type of each pulverizer. It is needless to say that various changes and modifications may be made without departing from the scope and.

[0020]

As described above, according to the operation control apparatus for a pulverizer of the present invention, the belt of the belt conveyer is provided at an upper position at the discharge side end of the belt conveyer for supplying the raw material to the pulverizer. Since a color identification sensor capable of identifying the color and the color of the raw material is provided, and a controller that issues an operation start command or an operation stop command to the crusher in accordance with a detection signal from the color identification sensor is provided, the belt is provided. When the raw material is conveyed by the conveyor and the raw material is supplied to the crusher, the color of the raw material present on the belt of the belt conveyor can be detected by the color identification sensor, and the detection signal is output. In accordance with the above, the operation start command can be given to the crusher from the controller, and the crushing process of the raw material can be performed, and when the supply of the raw material is stopped, the raw material runs out on the belt conveyor. Accordingly, the color of the belt is detected by the color identification sensor, and based on this detection signal, the operation stop command can be given to the crusher from the controller, and the crusher can be stopped. Can be automatically prevented from being continuously operated in the state described above, and when the supply of the raw material is restarted, the color of the raw material conveyed on the belt of the belt conveyor is determined by a color identification sensor. By detecting again and giving the operation start command from the controller to the crusher in the same manner as above, the crushing process of the raw material can be automatically restarted. Since it can be detected in a non-contact manner by the sensor, there is no risk of causing abrasion as in the case of directly contacting and swinging the raw material used conventionally,
Further, since the color identification sensor does not have a rotating part, it is possible to eliminate the possibility of being affected by dust and the like, and to prevent the possibility that the reliability is reduced even after a long continuous operation. It exhibits excellent effects, and furthermore, the color of the belt of the belt conveyor is black, and the color identification sensor is configured to be capable of distinguishing black from white or brown, so that white or brown is usually obtained. This makes it possible to easily distinguish the color of the cement raw material from the color of the belt, which is advantageous in controlling the operation of a crusher for crushing the cement raw material.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing one embodiment of an operation control device of a crusher of the present invention.

FIG. 2 is a schematic side view showing a conventional operation control device for a crusher.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cement raw material (raw material) 2 Belt conveyor 2a Belt 3 Roller mill (crusher) 19 Color identification sensor 20 Controller

Claims (2)

[Claims] 1. A color identification sensor is provided at an upper position of a discharge side end of a belt conveyor for supplying a raw material to a crusher, which can identify a color of a belt of the belt conveyor and a color of a raw material. An operation control device for a crusher, comprising: a controller that issues an operation start command or an operation stop command to the crusher in response to a detection signal from a sensor. 2. The operation control device for a crusher according to claim 1, wherein the color of the belt of the belt conveyor is black, and the color identification sensor is capable of distinguishing black from white or brown.