JP2681840B2 - Vertical crusher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a vertical mill for crushing limestone, cement raw material, coal, blast furnace slag, cement / clinker, chemicals, etc. by cooperation of a rotary table and a crushing roller. It relates to a mold crusher.

[Prior art] Vertical crushing equipped with a rotary table and crushing roller as a kind of crusher that crushes fine particles such as limestone, cement raw materials, coal, blast furnace slag, cement / clinker, and chemicals into fine powder. Machines are widely used. This kind of crusher is press-contacted with 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 an 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.

For example, in FIG. 3 showing a conventional vertical crusher,
The crusher generally designated by reference numeral 1 is formed as a single tower in appearance, and has a rotary table 3 which is rotated by an electric motor (motor) 2 arranged at the base thereof. A plurality of conical grinding rollers 4 are arranged so as to rotate in sliding contact with the rotary table 3.
Is rotatably supported by a supporting arm 5. The supporting arm 5 is fixed at its center to a supporting shaft 6 which is rotatably supported on the crusher side, and the supporting arm 5 surrounds the rotary table 3. It extends downward through the side of the casing 8 and 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 car curling.

Then, the granular material as the raw material supplied from the raw material supply device (not shown) to the center of the rotary table 3 through the supply pipe 11 is caught between the roller 4 and the rotary table 3 which are driven by the rotation of the table. The dam ring, which is rarely crushed and is formed as a weir in a circular ring shape on the outermost periphery of the rotary table and projects upward, overflows and falls. On the other hand, hot air is introduced into the casing 8 by a duct (not shown), and the hot air is blown up from the annular space 12 between the outer peripheral surface of the rotary table 3 and the inner peripheral surface of the casing 8. The fine powder rises in the crusher 1 while being dried, and is discharged from the discharge port 13 as a mixture with hot air and sent to the next step.

Although some of the coarse particles also rise in the crusher 1, they are classified by the upper separator 14 and returned to the turntable 3.

The rotating table 3 has a rotating shaft (not shown) extending vertically downward. The rotating force of the motor 2 is reduced in the casing of the speed reducer indicated by reference numeral 2A to reduce the rotating force of the rotating table 3. A thrust bearing mechanism and a radial bearing mechanism for supporting the rotary table 3 via the rotary shaft are provided in addition to the speed reducer transmitting to the rotary shaft (not shown).

[Problems to be Solved by the Invention] In the vertical crusher, as described above, the crushing roller bites the raw material between the crushing roller and the table surface to crush the raw material, and the crushing roller and the flat surface facing the crushing roller. In a conventional vertical crusher with a rotary table surface, for example, in the case of fine pulverization that requires extremely fine powder, such as limestone, which requires a product with a Blaine value of 10000 cm ² / g as the final fineness, the powder is If the tension hydraulic pressure applied to the crushing roller is increased to increase the degree of vibration, the vibration value (amplitude) becomes extremely large, making it difficult to continue stable continuous operation, and the crushing capacity cannot be increased.

[Means for Solving the Problems] In order to solve the above problems, the vertical crusher of the present invention is pivotally supported so that its upper surface is substantially horizontal, and is rotationally driven by a drive device about a vertical axis. In a vertical crusher comprising a rotary table and a crushing roller arranged on the rotary table, the rotary table is composed of a split table divided into a plurality of concentric large and small annular rings, and the split table The tables are arranged so as to be slidable in the vertical direction, and either a hydraulic cylinder or an electric cylinder is arranged as a means for sliding the divided table in the vertical direction below the divided table and connected to an adjacent divided table. The other end is connected to the split table, and the power supply hydraulic pipe or power wiring for the vertical sliding means is fixed to the fixed pipe above or below the axis of the rotary table. Through was linked structure through a slider (slip rings) to or fixed wiring connecting with.

[Operation] In the vertical pulverizer of the present invention, the rotary table is divided into a plurality of concentric large and small annular rings, and each divided table is configured to be freely movable up and down. When it is difficult to continue safe operation because the vibration amplitude generated in the vertical crusher increases depending on the severity of the fineness of the product powder to be used, it is possible to use a part of the partial rotary table corresponding to the crushing roller. It is possible to take an emergency measure to lower the vibration amplitude value by lowering the inner diameter side division roller corresponding to the above by an arbitrary height to reduce the substantial crushing portion area.
In this case, the capacity is also somewhat lowered, so after the vibration value falls within the allowable value, the capacity is restored by returning the rotary table to the original flat state while observing the operating condition.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

1 and 2 show one embodiment of the present invention. FIG. 1 is an enlarged longitudinal sectional view of a main part, and FIG. 2 is a plan view taken along the line II-II of FIG.

In the figure, 3 is a rotary table, 3a is a table liner, 3b is a liner holder, 3c is a dam ring, 3d is a cover,
Grinding roller, 4a roller body, 4b rotating shaft, 50 hydraulic cylinder, 50a piston rod, 50b hydraulic piping, 50c header, 50d quick coupling (pipe fitting), 5
0e is hydraulic piping, 50f is pipe fitting, 51 is support, 52 is hydraulic cylinder, 52a is piston rod, 53 is support, 60
Is a hydraulic pipe (fixed), 60a is a protective layer (fixed) for the pipe, and 60b is a cap. Further, H ₁ , H ₂ , and H ₃ are raw material layer thicknesses between the crushing roller and the respective division tables.

As shown in FIG. 1, the rotary table 3 is a concentric combination of three small, medium, and large diameter circular division tables 3x, 3y, 3z, and the upper and lower sides of each of the boundary surfaces. It is fitted so that it can move in any direction. The split table 3y is a piston rod of a hydraulic cylinder 50 (which may be an electric cylinder) fixed to the split table 3x via a bracket 51.
By moving back and forth of 50a, it moves up and down with respect to the divided table 3x. Similarly, the division table 3z is also configured to move up and down with respect to the division table 3y by advancing and retracting a piston rod 52a of a hydraulic cylinder (which may also be an electric cylinder) 52 fixed to the division table 3y via a bracket 53. It The dam ring 3c has an annular shape and is fitted around the outer circumference of the divided table 3z. From the hydraulic cylinders 50 and 52, hydraulic pipes (not shown) are connected to the hydraulic pipes 50b and 50b from the head side and the rod side, respectively.

The upper and lower hydraulic pipes 50b for driving the hydraulic cylinders 50 and 52 are connected to a header 50c at an intermediate position between the hydraulic cylinders 50, 50 adjacent to each other as shown in FIG. Is connected to the quick coupling (pipe joint) 50b at the top of the liner retainer 3b of the rotary table 3 via the hydraulic pipe 50e, the pipe joint 50f, and the hydraulic pipe 5g, which is connected to the hydraulic unit (not shown) outside the mill. Plumbing
Hydraulic cylinders 50 and 52 by being connected to 60
The vertical movement of the piston rods 50a and 52a can be controlled.

Further, in order to detect the height of the layer thickness H ₁ , H ₂ , H _3, a potentiometer or other non-contact type position sensor (for example, a magnetic scale) (not shown) is disposed in the vertical crusher,
Monitoring can be done in a remote control room.

Although powder is mixed in the boundary surface of each divided table, the mixed powder is discharged through mixed powder discharge ports 70 and 72 provided by obliquely punching the divided tables 3y and 3z.

By configuring as described above, for example, in the case of crushing raw materials that are hard and difficult to crush such as blast furnace slag and cement / clinker, and in the case of crushing limestone with a Blaine value of 10000 cm ² / g or more, it is possible to perform harsh operation. At this time, when the vibration value (amplitude) generated in the crusher frequently exceeds the allowable value (100 μm or less in one amplitude) for safety protection of the equipment, for example, for the outermost divided table 3z By lowering the inner divided tables 3y and 3z and changing the uniform raw material layer thickness H shown in Fig. 4, and by setting H ₁ > H ₂ ≧ H ₃ , the large vibration that has been generated until then Suppress. The reason why the vibration value can be suppressed to be small by taking such measures is that when the operation of the fine pulverization was suddenly stopped and the pulverization situation of the raw material just below the pulverization roller was observed, The powder on the outer diameter side (dam ring side) is almost the same as the final product (20 to 100 μm), while the powder on the inner diameter side (center of the rotating tail) of the roller width is 100 to 300.
A large number of intermediate particles of μm are seen, and it is speculated that such intermediate particles are a major factor in generating vibration. Therefore, by preventing the generation of such half-finished intermediate particles and temporarily forming a stepped liner, the actual crushing area is narrowed and the substantial surface pressure is increased to reduce vibration and reduce the crushing capacity. The ones intended for recovery are available.

In addition, in the vertical crusher of the present invention, the raw material layer thickness is changed in accordance with changes in operating load, raw material properties (grindability), wear of roller tires, table liners, etc., and changes in pulverization raw materials. If you want to change the value to an appropriate value by operating the hydraulic unit promptly during operation, you can change the height of the layer thicknesses H ₁ , H ₂ , and H ₃ to any upper or lower position. Can be done.

Further, instead of the hydraulic cylinder, a pneumatic cylinder or an electric cylinder can be used, and the dam ring can be moved up and down by connecting pneumatic piping or electric wiring, as in the case of the hydraulic cylinder. A slider (slip ring) can be used to connect the rotating part and the fixed part of the electric wiring.

In this embodiment, the hydraulic pipe 50g extends the rotary table shaft center upward, and the quick coupling 50b is arranged on the top of the liner retainer 3b. It may be connected to hydraulic piping from the outside by a quick coupling. In this case, the rotary table 3
The output shaft of the speed reducer 2A that rotationally drives the shaft may be hollow and penetrate therethrough.

[Effects of the Invention] As described above, in the present invention, the rotary table is divided into a plurality of annular shapes, and each is moved up and down in the vertical direction. It is possible to adjust the thickness of the raw material layer of each divided table according to the change of the crushing condition by remote control by providing a vertical sliding means. Therefore, there is no operation stoppage, no replacement work of the dam ring is required, the maintainability is improved, and the production efficiency is increased.

[Brief description of the drawings]

1 and 2 show one embodiment of the present invention. FIG. 1 is an enlarged longitudinal sectional view of a main part, and FIG. 2 is an enlarged plan view of a main part as viewed from II-II in FIG. 3 to 4 show an embodiment of a conventional vertical crusher, FIG. 3 is an overall vertical sectional view, and FIG. 4 is an enlarged vertical sectional view of an essential part. 1 …… Vertical crusher, 3 …… Rotary table, 3a …… Table liner, 3b …… Liner retainer, 3c …… Dam ring, 3d …… Cover, 3x, 3y, 3z …… Dividing table, 4 …… Grinding roller, 4a …… Roller body, 4b …… Rotary shaft, 50 …… Hydraulic cylinder, 50a …… Piston rod, 50b …… Hydraulic piping, 50c …… Header, 50d …… Quick coupling, 50e …… Hydraulic piping , 50f …… Piping joint, 50g …… Hydraulic piping, 51 …… Support, 52 …… Hydraulic cylinder, 52a …… Piston rod, 53 …… Support, 60 …… Hydraulic piping (fixed), 60a …… Protection tube ( Fixed), 60b …… Jinkasa, 70,72 …… Mixed powder outlet, H …… Raw material layer thickness (uniform), H ₁ , H ₂ , H ₃ …… Raw materials on each divided table 3z, 3y, 3x Layer thickness.

Claims (1)

(57) [Claims] 1. A vertical crusher equipped with a rotary table which is pivotally supported so that its upper surface is substantially horizontal and which is driven to rotate about a vertical axis by a drive unit, and a crushing roller which is drivenly arranged on the rotary table. In the above, the rotary table is composed of a plurality of divided tables which are concentrically divided into large and small annular shapes, and the divided tables are arranged so as to be slidable in the vertical direction and slide in the vertical direction of the divided table. As a moving means, either a hydraulic cylinder or an electric cylinder is arranged below the divided table and connected to an adjacent divided table, the other end is connected to the divided table, and power is supplied to the vertical sliding means. Connect hydraulic piping or power wiring to fixed piping above or below the axis of the rotary table via a rotary joint or to fixed wiring via a slider (slip ring). A vertical crusher characterized by being tied.