JPH06209B2 - Chubu mill internal behavior detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an apparatus for producing COM, that is, a coal oil slurry,
The present invention relates to optimal operation control in a tube mill using balls such as a CWM, that is, a pulverized coal high-concentration water slurry producing device, and a cement producing device.

[Conventional technology]

A conventional tube mill is shown in FIGS. In the figure, 01 is a mill body, which is a container for mixing coal 02, oil 03, and balls 04. 02 is coal, which is mixed with oil 03 by a ball 04 and crushed. Reference numeral 04 denotes a ball, which jumps by the rotation of the mill body 01, crushes coal 02, and mixes the pulverized coal and oil 03. Usually ball 0
4 is made of steel. Reference numeral 05 denotes a liner, which is fixed so as to form irregularities inside the mill body 01, and generates a ball scraping force in accordance with the rotation of the mill body 01, and functions to scrape up the ball 04. A motor 06 rotates the mill body 01 via the gear 07. Reference numeral 07 denotes a gear that is fixed to the mill body 01, and transmits the rotational force of the motor 06 to the mill body 01. Reference numerals 08 and 09 denote first and second bearings, which support the rotation of the mill body 01. 010
Inserts coal 02 and oil 03 into the mill body 01 with a feeder.

Reference numeral 011 denotes a tank auxiliary container, which guides a mixture of coal 02 and oil 03 discharged from the inside of the mill body 01, that is, COM to the tank 012. 012 temporarily stores COM in the tank. 013 is a stirrer which stirs the COM in the tank 012. 014 is a coal feeding hole, which is a feeder 010.
The coal 02 is loaded into the mill body 01 via the. 01
Reference numeral 5 denotes an oil feeding hole for feeding the oil 03 into the mill body 01.

Reference numeral 016 is a detection rod, which penetrates and is attached to the mill body 01. One end of it projects inside the mill body 01,
The other end is exposed to the outside of the mill body 01, and the accelerometer,
A vibration detector 019 including a speedometer and a piezoelectric element is fixed. When the ball 04 inside the mill body 01 hits one end of the detection rod 016, an ultrasonic wave is generated by the impact, and the ultrasonic wave is fixed to the other end of the vibration detector 0.
It is detected by 19. 017 is an insulator, and the detection rod 0
16 and the mill body 01 are isolated from each other by vibration, and are made of rubber or the like.

Reference numeral 018 denotes a mounting jig, which fixes the detection rod 016 to the mill body 01 via the insulator 017.

Reference numeral 020 denotes a transmitter, which amplifies an electric signal transmitted from the vibration detector 019 and indicating the behavior of the ball 04 inside the mill body 01, modulates it into a telemeter transmission signal, and transmits it as a radio wave via the first antenna 021. send. Reference numeral 021 denotes a first antenna, which transmits a signal. A second antenna 022 receives the radio wave signal transmitted from the first antenna 021 and transmits it to the receiver 023.

Reference numeral 023 denotes a receiver, which demodulates the signal transmitted from the second antenna 022, converts the signal into an electric signal indicating the behavior of the ball 04 inside the mill body 01, and transmits the electric signal to the determiner 025. 0
An angle detector 24 detects the position of the detection rod 016 as a rotation angle and transmits it to the determiner 025 and the control device 029.

Reference numeral 025 denotes a determiner, which processes an electrical signal indicating the behavior of the ball 04 transmitted from the receiver 023 to extract the behavior of the ball 04, that is, information such as departure, drop, and collision, and the angle detector 024. By referring to the rotation angle position signal of the detection rod 016 transmitted from, the both are associated.

A monitor 026 displays the processing result of the determiner 025. Reference numeral 027 denotes a Schmitt circuit, which shapes the signal waveform of the determiner 025 so that the behavior of the ball 04 is fragile, that is,
Binary presence / absence of the ball 04 leaving and falling (ON-O
FF), and sends it to the fall determination circuit 028.

Reference numeral 028 denotes a trailing edge determination circuit, which detects the time at which the ball 04 separates and falls from the signal indicating the presence or absence of the ball 04, such as separation and fall, as a rotation angle,
It is transmitted to the control device 029. Reference numeral 029 denotes a control device, which is a position where the ball 04 is released and dropped, which is set in advance,
The position detected by the fall determination circuit 028 is compared, and the position is controlled by the motor 06 that rotationally drives the mill body 01 so that the position falls within a preset allowable value.

Referring to FIG. 3, the operation will be described. Coal feed hole 014
And coal 02 and oil 03 charged from the oil charging hole 015
Are conveyed to the inside of the tube mill body 01 while being mixed by the feeder 010. Tube mill body 01
Is supported by the first and second bearings 08 and 09, the motor 06 receives a rotational force via the gear 07 and rotates at a predetermined rotational speed. Mill body 0
The ball 04 inside 1 moves due to the scraping force of the liner 05 fixed to the inner wall of the mill body 01. The movement consists of rotation, jumping and falling, and the balls 04 violently hit each other.

The group of balls 04 crush the coal 02 mixed in the meantime and mix the crushed coal 02 and the oil 03 to generate a mixed fuel of pulverized coal and oil, that is, COM. The generated COM flows into the tank 012 via the tank auxiliary container 011. CO stored in tank 012
The M is stirred by a stirrer 013 to prevent solidification. The COM generated in this way is stored in the tank 0
It is taken out from 12 COM outlets and used as fuel for boilers.

[Problems to be solved by the invention]

Now, the efficiency of COM production by the conventional tube mill is
It is known that the behavior of the ball 04 inside the mill body 01 is good when it is in the state shown in FIG. 6 and not good when it is in the state shown in FIG. 7 and FIG.
In the conventional method, since the means for detecting and determining the behavior of the ball 04 inside the mill body 01 is mounted on only one cross section, the input amount and quality of the coal 02 and the oil 03, the size of the ball 04, A phenomenon in which the diameter rotational speed of the mill body 01, the mixing of COM, the maturity degree, and the like were complicatedly involved, and it was not possible to correctly determine not only the information on one cross section of the tube mill body.

That is, it was not possible to grasp information on all processes such as crushing, mixing, and maturation from the inlet to the outlet of the tube mill body.

[Means for solving problems]

In order to solve the above problems, the present invention puts a plurality of balls made of steel or the like and a solid matter in a cylindrical body and rotates them.
In a tube mill for crushing the solid matter, one end of the tube mill body wall projects from the inner wall surface of the body,
A plurality of detection rods, the other end of which is exposed to the outside of the mill body and are insulated from the mill body by a vibration insulator, are arranged in the rotation axis direction of the mill body, and the detection rod mill is provided. Vibration detectors are attached to the outer ends of the body, and ultrasonic signals generated by the steel balls in the body coming into contact with the other end protruding from the inner wall surface of the detection rods propagate through the detection rods. The detection rod comprises means for detecting with a vibration detector attached to the outer end of the mill body of the detection rod, and means for detecting the rotational position of the detection rod as the mill body rotates. The present invention provides a tube mill internal behavior detection device characterized by detecting an internal behavior of a tube mill by processing a signal from a rod vibration detector and the rotational position detection signal.

[Action]

In the device of the present invention, the ball that is rotated and raised while being in contact with the detection rod starts to fall by its own weight when it reaches a certain rotation angle, but at the time of starting this drop, it is caused by the contact between the ball and the detection rod. Since the existing ultrasonic signal disappears, the rotation angle of the detection rod at this position may be detected.

Further, since a plurality of detection rods are arranged in the axial direction of the tube mill body, the behavior inside the tube mill body can be grasped three-dimensionally.

This makes it possible to determine the falling rotation angle and rotation speed of the ball, which are optimum for crushing solids.

〔Example〕

The present invention will be described below based on an embodiment shown in FIGS. 1 and 2.

The reference numerals 1 to 15 in FIG. 1 are equivalent to the reference numerals 01 to 015 in FIGS. 3 to 4, and therefore description thereof will be omitted.

The conventional control circuit shown in FIG. 5 uses the same control circuit in this embodiment as well, and therefore, illustration and description thereof will be omitted.

16a, 16b and 16c are detection rods, which are arranged in the direction of the rotation axis of the tube mill body. 16a is an entrance, 16
b is an intermediate part and 16c is an outlet. Each of the detection rods 16a, 16b, 16c penetrates the mill body 1 and is attached thereto. One end thereof projects inside the mill body 1, and the other end is exposed to the outside of the mill body 1 and a vibration detector 19 is fixed to it.

Reference numeral 17 denotes an insulator, which insulates vibration between the detection rod 16 and the mill body 1, and is made of rubber or the like.

Reference numeral 18 denotes a mounting jig, which fixes the detection rod 16 to the mill body 1 via an insulator 17.

Now, the operation of the present embodiment will be described with reference to FIGS. 1 and 2, while the coal 2 and the oil 3 charged from the coal feed hole 14 and the oil feed hole 15 are mixed by the feeder 10, It is conveyed inside the mill body 1. The mill body 1 is supported by the first and second bearings 8 and 9, and is rotated by a motor 6 through a gear 7 to rotate at a predetermined rotation speed.

The balls 4 inside the mill body 1 move due to the scraping force of the liner 5 fixed inside the mill body 1. The movement consists of rotation, jumping and falling, and the balls 4 collide violently. The ball group 4 crushes coal mixed in the meantime and mixes the crushed coal and oil to generate a mixed fuel of pulverized coal and oil, that is, COM. The generated COM flows into the tank 12 via the tank auxiliary container 11. C stored in tank 12
The OM is stirred by the stirrer 13 to prevent solid matters. The COM generated in this way is stored in the tank 1
It is taken out from COM outlet 2 and used as fuel for the boiler.

In the rotating state of the mill body 1 described above, one end of each of the detection rods 16a, 16b, 16c that penetrates through the mill body 1 protrudes inside the mill body 1, and the balls inside the body come into direct contact. Ultrasonic waves or vibrations generated by friction when the balls in contact with each other are released are transmitted to the outer end of the body. The ultrasonic wave or vibration transmitted to the external end is detected by the vibration detector 19 mounted and converted into an electric signal. That is, as the balls 4 attached to the liner 5 are separated and dropped as shown in FIG. 6 by the centrifugal force of rotation of the mill body 1, ultrasonic waves or vibrations generated by contact with the detection rod 16 are vibrated. It is detected by the detector 19 and output as an electric signal.

Since each of the detection rods 16a, 16b, 16c is fixed to the mill body 1 by an attachment jig through an insulating material, the ball 4 contacting the detection rods 16a, 16b, 16c.
And behaviors other than the ball 4 in the vicinity thereof are not sensed.
The output signal of the vibration detector 19 is connected by an electric wire to a transmitter 20 arranged in the vicinity of the body of the vibration detector 19, and the electric signal is amplified and modulated by the transmitter 20 and is transmitted to the body. The signal is transmitted from the transmission antenna 21 that is appropriately installed in. The signal transmitted from the transmission antenna 21 is received by a reception antenna 22 provided appropriately near the mill body (for example, a place fixed on the floor or on the ground), and amplified by a receiver 23 connected to the reception antenna 22, It is being demodulated.

Then, the detection rods 16a, 16 transmitted from the angle detector
The signal processing is performed while referring to the signal representing the positions of b and 16c by the rotation angle, and the information as shown in FIG. 2 is output.

FIG. 2 shows an electric signal output from the determiner 025, the horizontal axis indicates the rotational position of the body, and the symbol BDC indicates the position of the body bottom dead center of the detection rod 16 detected by the angle detector 024. , Waveforms 16a, 16b, 16c are detection rods 16
The behavior of the ball in the body detected by a, 16b, and 16c is shown. That is, the peak point of the waveform represents the maximum friction point (fall start point or fall end point) of the ball in the body with respect to the detection rod 16, and the lowest level point represents the point where the ball is stationary or there is no ball. There is. Further, the increasing gradient to the peak point is an increasing state of the contact amount of the ball per unit time.

As described above, in the conventional tube mill, the behavior inside the mill body can be grasped only in one section,
The one that could not be operated efficiently through the whole is the one in which the detection rods 16a, 16b and 16c are provided at the inlet portion, the central portion and the outlet portion of the mill body 1, Behavior can now be grasped as three-dimensional information.

Based on this information, it has become possible to determine the optimum number of revolutions of the mill body 1 having the best grinding efficiency.

In the present embodiment, the detection rods are arranged at three locations on the wall of the mill body, but if more detection rods are arranged, the behavior inside the mill body can be grasped with even higher accuracy.

〔effect〕

Conventional tube mills operate without understanding the overall behavior of the balls in the axial direction of the tube mill body, so it is difficult to achieve efficient operation, and in practice, inefficient operation is performed. There were many things.

In the present invention, a plurality of detection rods mounted in the rotation axis direction of the mill body and a means for extracting ultrasonic waves detected by a vibration detector fixed to the detection rod, and a means for detecting the rotation angle of the detection rod, Since the axial ball behavior inside the tube mill body can be detected as three-dimensional information, it is possible to set the optimum number of rotation points with high grinding efficiency.

[Brief description of drawings]

1 and 2 show an embodiment according to the present invention. FIG. 1 is a longitudinal sectional view thereof, FIG. 2 is an output signal waveform, and FIGS. , Fig. 3 is its longitudinal section
FIG. 4 is a cross-sectional view. FIG. 5 is a control circuit diagram, FIGS.
FIG. 4 is an explanatory view showing behavior of balls in the tube mill. 1 ... Tube mill body 2 ... Coal 4 ... Balls 16a, 16b, 16c ... Detection rod 19 ... Vibration detector 24 ... Angle detector

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Yamamoto 1-1 1-1 Atsunoura-machi, Nagasaki-shi, Nagasaki Mitsubishi Heavy Industries, Ltd. Nagasaki Research Institute (72) Inventor Shozo Kaneko 1-1-1, Atsunoura-cho, Nagasaki-shi, Nagasaki Mitsubishi Heavy Industry Co., Ltd. Nagasaki Shipyard (72) Inventor Masaaki Kinoshita 1-1, Atsunoura-cho, Nagasaki-shi, Nagasaki Mitsubishi Heavy Industries Ltd. Nagasaki Shipyard

Claims (1)

[Claims] 1. A tube mill in which a plurality of balls made of steel or the like and a solid material are put into a cylindrical body and rotated to crush the solid material, wherein one end of the tube mill body wall is from an inner wall surface of the body. A plurality of detection rods, which are projected and whose other end is exposed to the outside of the mill body and are insulated from the mill body by a vibration insulator, are arranged in the rotation axis direction of the mill body, and the detection rods are provided. A vibration detector is attached to each of the outer ends of the mill body, and an ultrasonic signal generated by the steel balls inside the body coming into contact with the rod ends protruding from the inner wall surface of the detection rod propagates the detection rod. And a means for detecting with a vibration detector attached to the outer end of the mill body of the detection rod, and means for detecting the rotational position of the detection rod as the mill body rotates, The signal from the vibration detector of the detection rod and the rotational position Tube Mill internal behavior detection apparatus characterized by detecting the internal tube mill behavior by processing the detection signal.