JPH0568903A - Vertical grinder - Google Patents

Abstract

PURPOSE:To provide a vertical grinder reduced in a mill generated vibration value even in severe operation extremely finely grinding a raw material inferior to grindability and hard to grind. CONSTITUTION:The arm bearings 5A supporting the horizontal shaft 6 of the arm 5 supporting a grinding roller 4 and shaken up and down are fixed to the top plate 80A of an annular common base 80 in a plan view.

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 raw materials such as limestone, slag, clinker, cement raw materials and chemicals in cooperation with a rotary table and a pulverizing roller.

[0002]

2. Description of the Related Art FIG. 3 is a kind of crusher for pulverizing raw materials such as limestone, slag, and cement raw material into fine powder
As shown in (1), a vertical crusher 1 having a rotary table and a crushing roller is widely used. This kind of crusher
A disk-shaped rotary table 3A which is driven by a speed reducer 2 by a motor 2A to rotate at a low speed in a lower portion of the cylindrical casing 15, and is driven to rotate by hydraulically contacting a portion equally dividing the outer peripheral portion of the upper surface thereof in the circumferential direction. And a plurality of crushing rollers 4 for

The crushing roller 4 is connected to a piston rod 10 of a hydraulic cylinder 9 via an arm 5 and an arm 7, which are swingably supported by a horizontal rotary shaft 6 in a casing 15, and actuate the hydraulic cylinder 9. By letting
The crushing roller 4 is pressed onto the rotary table 3A to apply crushing pressure to the raw material. As shown in FIG. 4, the horizontal rotary shaft 6 is supported by arm bearings 6A at both ends, and the arm bearings 6A and 6A are fastened and fixed to the upper surface of the top plate 8A of the column base 8 with a bottle nut. 8B is a side plate, 8a is a manhole, 8b
Is an inspection hole. 3B is a dam ring provided on the outer peripheral edge of the rotary table 3A for adjusting the raw material layer thickness, 14 is a gas blowing annular space passage around the rotary table 3A, 14A is a gas supply passage, and 13 is a raw material crushed by blades 13A. A rotary separator for classification, 16 is an outlet for taking out a product together with gas, and 17 is a raw material charging chute.

In such a vertical crusher, the raw material supplied to the central portion of the rotary table by the raw material feeding chute 17 receives the centrifugal force in the radial direction of the rotary table 3A and slides on the rotary table 3A. At times, the rotary table 3A receives a force in the rotation direction, and the rotary table 3A
It slides with A and performs a rotation somewhat slower than the rotation speed of the rotary table 3A. The above two forces, that is, the radial direction force and the rotational direction force are combined, and the raw material is the rotary table 3.
A spiral locus is drawn on A to move to the outer peripheral portion of the rotary table 3A. Since the roller is pressed against the outer periphery and is rotating, the raw material in which the spiral is drawn enters the crushing roller 4 and the rotary table 3A from a direction forming an angle with the roller axial direction and is bitten. It is crushed and crushed.

On the other hand, at the base of the casing 15, gas such as air or hot air is introduced by a duct,
This gas is blown up from the annular space passage 14 between the outer peripheral surface of the rotary table 3A and the inner peripheral surface of the casing, so that the pulverized fine powder is entrained in the gas and the casing 1
5, the blade 1 of the separator 13 that is located in the upper part
The product having a predetermined particle size is subjected to the classification action by 3A and is discharged together with the gas from the discharge port 16 and sent to the next step.

Further, the crushing roller 4 on the rotary table 3A
As shown in FIG. 5, the extension line of the rotation axis of does not pass through the center point M of the turntable 3A, but passes through a point N spaced apart from the center point M. Therefore, when crushing the raw material, when the crushing roller 4 is pressed and driven by the rotary table 3A, not only the compressive force but also the shearing force with the rotary table 3A is applied to the raw material, and the crushing is performed more efficiently. Done. That is, all but one point of the peripheral surface of the crushing roller 3A rotates faster or slower than the peripheral speed of the rotary table 3A, and a speed difference occurs between the crushing roller 3A and the peripheral surface.

[0007]

In the conventional vertical crusher as described above, the crushing force applied to the raw material is not only the compressing force but also the shearing force, so that the crushing can be performed efficiently. The range of crushed raw materials has expanded to special ones with poor grindability, and the demand for product grain size is moving toward finer ones (ultrafine crushing region). Therefore, when crushing a raw material that is difficult to crush into fine powder of micron order or submicron, the crushing surface pressure is large, and the fine powder exists in layers between the rotary table and the crushing roller. Vibration frequently occurred (self-excited vibration), the vibration value of the entire mill was large, and various equipment was damaged, causing trouble in operation.

Particularly, when a raw material having relatively poor pulverizability is ultrafinely pulverized, mill vibration often occurs, and when the vibration value (amplitude) is particularly large, the equipment is damaged or cannot be operated. There were times when I was forced to stop driving without stopping. Therefore, in order to prevent large vibrations, the table weir height (dam ring height), crushing pressure, crushing pressure, It is conceivable to change the table rotation speed by changing the table rotation speed. Of these, changing the drive device of the rotary table is too expensive to implement and the feasibility is low, and the table weir height (dam ring height) is low. In order to change, the internal work after stopping the operation of the crusher is required, and there is the problem that changing the crushing pressure will change the product particle size to the desired one. The actual situation is that it would impair a stable production plan.

[0009]

In order to solve the above problems, a plurality of rotatable crushing rollers are arranged on the upper surface of the outer peripheral portion of a rotary table, and the raw material supplied to the central portion of the rotary table is crushed by a predetermined crushing roller. In a vertical crusher that applies pressure to crush between the upper surface of the rotary table and the peripheral surface of the crushing roller, an arm bearing that supports the crushing roller and horizontally swings the arm vertically swings in plan view. The structure is fixed on the upper surface of an annular common base.

[0010]

In the vertical crusher of the present invention, like the conventional vertical crusher, the arm bearing is stopped from being installed on the column base provided for each crushing roller, and is constructed in an annular shape. Since the arm bearing of each crushing roller is arranged on the common base, even if the shearing force is received from the crushing roller via the arm bearing, the common base has an annular integral shape. It is strong against shear deformation, and the generated vibration value is small.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 and 2 relate to an embodiment of the present invention,
FIG. 1 is a perspective view of a main part, and FIG. 2 is an overall plan view. As shown in the figure, the crushing roller 4 is supported by a bearing built in the arm 5, the arm 5 is swingably supported around a horizontal rotary shaft 6, and the arm bearings 6A on both sides supporting the rotary shaft 6 are supported. Is fixed to the top plate 80A of the common base 80 with bolts and nuts. The common base 80 is composed of two side plates 8 that are concentric and are inclined vertically or substantially vertically on a circular donut-shaped bottom plate 80C.
0B and 80B are provided upright, and a circular donut-shaped top plate 80A is further provided on the top to be integrated. And
They are arranged concentrically with the central axis of the vertical crusher 1. A manhole 80a for inspection of the hydraulic cylinder 9 for pressing the crushing roller 4 against the rotary table 3A is punched in the outer side plate 80B.

In the vertical crusher of the present invention, the arm bearings 6A, 6A that pivotally support the crushing roller 3A do not have to use the column bases 8 that stand independently for each crushing roller 3A, but instead use a circular circle. Since the arm bearings 6A, 6A for the respective crushing rollers are fixedly mounted on the top plate 80A of the common base 80 integrated in an annular shape, the shearing force on the bottom surfaces of the crushing roller 3A and the arm bearings 6A during operation, In other words, even if the torsion (torsion moment) acting on the common base 80 is large, since the common base 80 is integral with the circumference and the total weight is large, the torsional rigidity is large and the torsional deformation and the vibration value accompanying it are small.

Further, as can be seen by comparing FIGS. 1 and 4, in the independent column base 8 of the prior art, the side plate 8B is a face plate, whereas the common base of the present invention is used. The side plate 80B of 80 is a curved plate (cylindrical or truncated cone shape). When the plate thickness is the same for the same force, the curved plate is generally more advantageous than the flat plate for deformation. Therefore, the curved side plate of the present invention is also excellent for the torsion moment.

[0014]

As is apparent from the above description, in the vertical crusher of the present invention, since the column bases supporting the arm bearings are formed into an annular common base, the torsional rigidity is increased. However, the vibration value generated during operation can be kept small. Therefore, stable operation can be continued even under severe crushing conditions, which improves operational operability, maintenance, and productivity.

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts showing an embodiment of a vertical crusher of the present invention.

FIG. 2 is an overall plan view of an essential part showing an embodiment of a vertical crusher of the present invention.

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

FIG. 4 is a perspective view of a main part of a conventional vertical crusher.

FIG. 5 is a schematic side view of a conventional vertical crusher.

[Explanation of symbols]

 1 Vertical Grinder 3A Rotary Table 4 Grinding Roller 5 Arm 6 Rotating Shaft 6A Arm Bearing 7 Arm 8 Pillar 8A Top Plate 8B Side Plate 8a Manhole 8b Inspection Hole 80 Common Base 80A Top Plate 80B Side Plate 80C Bottom Plate 80a Manhole

Claims (1)

[Claims] 1. A plurality of rotatable crushing rollers are arranged on the upper surface of the outer peripheral portion of the rotary table, and the raw material supplied to the central portion of the rotary table is applied with a predetermined crushing pressure to the crushing roller, and the upper surface of the rotary table and the peripheral surface of the crushing roller. In a vertical crusher for crushing with a surface, an arm bearing for bearing the crushing roller and bearing a horizontal rotary shaft of an arm swinging up and down is fixedly mounted on the upper surface of an annular common base in plan view. Vertical crusher characterized by.