JP2622635B2 - 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 crusher for crushing cement raw materials, coal, chemicals and the like by cooperation of a rotary table and crushing rollers.

[0002]

2. Description of the Related Art A vertical pulverizer equipped with a rotary table and a pulverizing roller is widely used as a type of pulverizer for finely pulverizing granules such as cement raw materials, lime and chemicals into powder. This type of crusher is press-contacted by a hydraulic pressure or the like at a lower part of a cylindrical casing, which is driven by a motor with a speed reducer and rotates at a low speed, and at a location where the outer peripheral portion of the upper surface is equally divided in a circumferential direction. And a plurality of crushing rollers that are driven and rotated.

[0003] For example, in Fig. 3 showing a conventional vertical crusher, the crusher indicated by reference numeral 1 is formed as a single tower in appearance, and its base is rotated by an electric motor (motor) 2. Table 3 is arranged. A plurality of conical pulverizing rollers 4 are arranged so as to rotate while being in sliding contact with the rotary table 3, and the pulverizing rollers 4 are rotatably supported by a support arm 5.
The support arm 5 is fixed at its center to a support shaft 6 which is rotatably supported on the side of the pulverizer. The support arm 5 extends downward through the side of the casing 8 surrounding the rotary table 3. ， It faces the lower space of the crusher. The lower end of the support arm 5 is rotatably supported on the tip of a rod of a pressure cylinder 9 whose lower end is rotatably supported on the base of the crusher 1. Reference numeral 10 indicates a coupling.

[0004] Granules as a raw material supplied from a raw material supply device (not shown) to the center of the rotary table 3 through a supply pipe 11 are transferred between the roller 4 driven by the rotation of the table and the rotary table 3. It is bitten and crushed. On the other hand, hot air is guided into the casing 8 by a duct (not shown), and this hot air blows up from an annular space 12 between the outer peripheral surface of the turntable 3 and the inner peripheral surface of the casing 8. The fine powder rises inside the pulverizer 1 while being dried, and is discharged from the discharge port 13 as a mixture with hot air and sent to the next step.

[0005] Incidentally, some of the particles having a coarse particle
Inside, but is classified by the upper separator 14,
It is returned onto the turntable 3. The turntable 3 has a rotary shaft (not shown) extending vertically downward.
In the casing of the speed reducer denoted by reference numeral 2A, in addition to the speed reducer for reducing the rotational force of the motor 2 and transmitting it to the rotary shaft of the rotary table 3, the rotary table 3 is supported via the rotary shaft. A thrust bearing mechanism and a radial bearing mechanism are provided (neither is shown).

[0006]

In a vertical pulverizer, as described above, the rollers bite the raw material between the table and the surface to pulverize the raw material, but between the rotary table and the pulverizing roller. If the thickness of the interposed raw material layer is not appropriate, or if the supply of the raw material is too large or too small and is not an appropriate amount, the rollers run idle and the crushing efficiency is significantly reduced.

Therefore, as shown in FIG. 4, an annular dam ring 3c higher than the liner 3a of the rotary table 3 is provided at the outermost periphery of the rotary table to serve as a weir for a raw material layer to be pulverized. For this reason, the raw material layer is maintained at an appropriate height, and good pulverization is ensured. However, the table liner 3a and the roller body 4a of the crushing roller are worn as the crushing progresses, or the material layer thickness H is forced to be changed to a suitable raw material layer thickness H with the change in crushability due to the change of the crushing material. Accordingly, the dam ring height h must be changed. Therefore, the operation is stopped, and after waiting for cooling in the mill, the operator enters the mill and manually changes the combination of the thicknesses of the multiple steel sheets forming the dam ring to change the thickness to a predetermined level. Work was needed. In addition, even if the properties of the raw materials change without stopping the operation, the height h of the dam ring could not be changed in a short time in accordance with the change.

[0008]

In order to solve the above problems, a vertical crusher of the present invention is pivotally supported so that the upper surface is substantially horizontal, and is driven to rotate about a vertical axis by a driving device. In a vertical pulverizer having a rotating table and a grinding roller slidably disposed on the rotating table, an outermost peripheral surface of the rotating table is screwed and screwed to the rotating table outside the rotating table. An annular dam ring is disposed so as to be able to move up and down in the vertical direction, and a plurality of drive bars are protruded at equal circumferential intervals on an outer peripheral side surface of the dam ring. A pair of hydraulic shillings, which press and rotate the dam ring clockwise or counterclockwise, are arranged on the casing of the vertical pulverizer so as to be horizontally rotatable about a vertical axis.

[0009]

The vertical crusher according to the present invention is provided with a screw on the outermost peripheral surface of the rotary table, a threaded annular dam ring with an inner peripheral surface threaded on the screw, and provided on the outer peripheral surface of the dam ring. The piston rod of the hydraulic cylinder pivotally supported by the casing is brought into contact with the drive bar to move it forward and backward, thereby rotating it and moving the dam ring up and down. Therefore, it is necessary to suspend the mill operation and wait for the inside of the mill to cool down. Ring height can be adjusted.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 relate to an embodiment of the present invention.
FIG. 1 is an enlarged vertical sectional view of a main part of a pulverizing part, and FIG. 2 is an enlarged plan view of a main part of a dam ring part.

In the figure, a male screw X is provided on the outer peripheral side surface of the rotary table 3, and a dam ring 3 c having an internal screw Y screwed with the male screw X on the internal peripheral surface is threaded and attached to the rotary table 3. As shown in FIG. 2, a plurality of drive bars 3d are formed at equal circumferential intervals on the outer peripheral side surface of the dam ring 3c. And the casing 8
The hydraulic cylinder 40 is rotatably supported in the horizontal direction by a bracket 48 on the outside via a rotary shaft 42, and a piston rod 40a and a knob 40b attached to the tip thereof penetrate through the through hole 8a of the casing 8 to be inside. I'm stuck. A tension coil spring 46 is mounted between the bracket 48 and the tip of the hydraulic cylinder 40 so that the knob 40b always contacts the outer peripheral surface of the dam ring 3c and the side surface of the drive bar 3d.
It is biased clockwise. A hydraulic cylinder different from the hydraulic cylinder 40 shown in FIG. 2 in the right and left direction is provided at another portion of the casing 8 so that the dam ring 3c can rotate clockwise or counterclockwise, respectively. H is the thickness of the raw material layer, h is the height of the dam ring, and 1 is the distance (gap) between the inner end face of the dam ring and the outer diameter of the roller body 4a.

Next, the operation of the dam ring 3c and the hydraulic mechanism configured as described above will be described. If it is necessary to change the raw material layer thickness H during operation, it is necessary to change the dam ring height h. At this time, the motor for driving the rotary table 3 is stopped. Then, the cover 8b of the through hole 8a is removed, and the piston rod 40a of the hydraulic cylinder 40 is advanced from the most retracted position. As shown in FIG. 2, the tip knob 40b abuts on the side surface of the drive bar 3d. Drive bar, ie dam ring 3
c rotates clockwise, and in the case of right-handed screw, dam ring 3c
Descends. Similarly, when it is desired to raise the dam ring 3c, a counterclockwise hydraulic cylinder is operated. After the piston rod 40a has completed its stroke, the piston rod 40a performs a retreating operation, comes into contact with the next drive bar 3d, and performs an advancing operation again. By calculating in advance how many mm the dam ring 3c moves up and down with respect to the turntable 3 by the rotation of the drive bar for one pitch, it is determined how many pitches the desired height adjustment value corresponds to. The above operation is repeated a plurality of times to set a predetermined height. When the above height adjustment operation is completed, the piston rod is retracted to the last retracted position, the cover 8b is closed, and the operation is resumed.

Further, in order to detect the height of the dam ring 3c, a potentiometer (not shown) or another non-contact type position sensor (for example, a magnetic scale) is provided in the vertical pulverizer and monitored in a remote operation room. You can do it.

With the above-described configuration, the dam ring height is increased in accordance with the fluctuation of the operating load and the raw material properties (grindability), the wear of the roller tires and the table liner, and the change of the pulverization conditions. When it is desired to change the height h to an appropriate value, the height of the dam ring 3c can be changed to an arbitrary vertical position by operating the hydraulic unit as needed during operation.

Further, a pneumatic cylinder or an electric cylinder can be used instead of the hydraulic cylinder, and the dam ring can be moved up and down by connecting pneumatic pipes and electric wires, as in the case of the hydraulic cylinder.

[0016]

As described above, according to the present invention, an annular dam ring is provided at the outermost periphery of the rotary table so as to be vertically movable by screwing, and a vertical lifting means is provided. The height of the dam ring can be arbitrarily changed according to the fluctuation of the crushing conditions. Therefore, there is no long-time operation stoppage, and there is no need to replace dam rings, thereby improving maintainability and increasing production efficiency.

[Brief description of the drawings]

FIG. 1 is an enlarged longitudinal sectional view of a main part of a vertical pulverizer pulverizing section showing one embodiment of the present invention.

FIG. 2 is an enlarged plan view of a main part of a vertical pulverizer dam ring portion showing one embodiment of the present invention.

FIG. 3 is an overall vertical sectional view of a conventional vertical crusher.

FIG. 4 is an enlarged vertical sectional view of a main part of a pulverizing section of a conventional vertical pulverizer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical grinder 3 Rotary table 3a Table liner 3b Liner presser 3c Dam ring 3d Drive bar 4 Crush roller 8 Casing 8a Through hole 8b Cover 40 Hydraulic cylinder 40a Piston rod 40b Knob 42 Rotating shaft 46 Tension coil spring 48 Bracket X Male screw Y Female screw

Claims (1)

(57) [Claims] 1. A vertical pulverizer comprising a rotary table pivotally supported so that an upper surface thereof is substantially horizontal and driven to rotate about a vertical axis by a driving device, and a pulverizing roller slidably disposed on the rotary table. An outermost peripheral surface of the rotary table is screwed, and an annular dam ring screwed to the rotary table is disposed outside the rotary table so as to be vertically movable.
A plurality of drive bars are protruded at equal circumferential intervals on the outer peripheral side surface of the dam ring, and the side surface of the drive bar is pressed as the piston rod advances to rotate the dam ring clockwise or counterclockwise. A vertical crusher in which a pair of hydraulic cylinders are disposed on the casing of the vertical crusher so as to be rotatable horizontally about a vertical axis.