JPH07843A - Vertical crusher - Google Patents

Abstract

PURPOSE:To ensure that a comparatively higher crushing capacity is maintained by controlling an abnormal vibration generated during crushing in a fine crushing region. CONSTITUTION:The vertical crusher has a ratio of the average diameter (d) of a crushing roller 4 to the diameter of a rotating table 3A being set to 0.25 to 0.75 for two rollers, 0.20 to 0.55 for three rollers and 0.15 to 0.45 for four rollers. In addition, the crusher has a lateral width (b) of the crushing roller 4 being 0.14 times the diameter D of the rotating table 3A.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a cement raw material, limestone, slag, by combining a rotary table and a crushing roller.
The present invention relates to a vertical crusher for crushing raw materials such as clinker, ceramics, chemicals, etc., and particularly to a vertical crusher that suppresses vibration generated during crushing in a fine crushing area and improves productivity.

[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
At the lower part of the cylindrical casing 15, a disk-shaped rotary table 3A driven by a speed reducer 2 by a motor 2A to rotate at a low speed, and hydraulically pressure-contacted with a portion equally dividing the outer peripheral portion of its upper surface in the circumferential direction, and driven to rotate. And a plurality of crushing rollers 4.

The crushing roller 4 is connected to a piston rod 10 of a hydraulic cylinder 9 through an arm 5 and an arm 7 which are pivotally supported by a shaft 6 in a casing 15, and by operating the hydraulic cylinder 9, The crushing roller 4 is pressed against the rotary table 3A to apply a crushing pressure to the raw material. 3B is a dam ring provided on the outer periphery 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 chute 17 receives the centrifugal force in the radial direction of the rotary table 3A and slides on the rotary table 3A. Sometimes the rotary table 3A receives a force in the direction of rotation,
It slides with A and makes 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 between the crushing roller 4 and the rotary table 3A from a direction forming an angle with the roller axial direction and is bitten therein. It is crushed and crushed.

On the other hand, a gas such as air or hot air is introduced into the base of the casing 15 by a hot air duct 20, and this gas is an annular space between the outer peripheral surface of the rotary table 3A and the inner peripheral surface of the casing. By being blown up from 14, the pulverized fine powder is entrained in the gas and rises in the casing 15, and is subjected to the classification action by the blades 13A of the separator 13 located at the upper part, and the product having a predetermined particle size is discharged together with the gas through the discharge port 16 And sent to the next process.

In the conventional vertical crusher as described above, especially in the case where medium crushing is intended, such as when crushing cement raw material or coal, the size of the crushing roller is varied in order to maximize the crushing ability. The original (roller average diameter and roller width) is designed, and the maximum dimension that can be arranged on the rotary table is determined as a target, and the roller average diameter d is d = (0.70 ~
0.85) D, 3 rollers d = (0.55
0.70) D, 4 rollers d = (0.40-
0.55) D was selected. That is, in the numerical range of the above roller average diameter d, the upper limit value is set by the geometrical limit in the table arrangement, and the lower limit value is compared with the crushing capacity required by the customer. When the standard capacity of the vertical crusher of the model number is large, it shows the limit to reduce the cost of the equipment by reducing the roller average diameter.

[0007]

However, when such a conventional vertical crusher crushes a fine crushing area having a smaller product particle size than the medium crushing area, the raw material is caught in the crushing roller. In addition to the inability to continue stable operation due to reduced efficiency and abnormal vibration of the mill,
The crushing ability was also reduced.

[0008]

In order to solve the above problems and to provide a vertical crusher having a high crushing capacity with little abnormal vibration even in a fine crushing area, the present invention provides an upper surface of an outer peripheral portion of a rotary table. A plurality of rotatable crushing rollers are arranged on the upper surface of the rotary table and the peripheral surface of the crushing roller by applying a predetermined crushing pressure to the crushing roller with the raw material supplied through the raw material chute hanging above the center of the rotary table. In a vertical crusher for crushing between two rollers, the ratio of the average diameter of the crushing roller to the diameter of the rotary table is 0.25 to 0.75 for the two rollers and 0.2 for the three rollers.
0 to 0.55, and 0.15 to 0.
The width of the crushing roller was 45 and the width of the crushing roller was 0.14 times the diameter of the rotary table.

[0009]

The vertical crusher of the present invention is equipped with a crushing roller having a smaller diameter and a narrower width than the conventional standard roller for crushing. The vertical movement of the mill is also reduced and the abnormal vibration of the mill is drastically reduced, and stable continuous operation is continued. In addition, as a result of achieving a stable and continuous crushing state with less vibration, the crushing capacity also maintains a relatively high value.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a comparative explanatory view of crushing roller dimensions of the present invention and a conventional example, and FIG. 2 is a comparative explanatory view of raw material trapping angles of the crushing roller of the present invention and a conventional example. The vertical type crusher 1 equipped with the standard roller of the conventional example is suitable for crushing cement raw materials, limestone, etc. to, for example, about 88 μR10 to 15%, that is, it is optimal for use in a so-called medium crushing area, and the crushing capacity should be maximized as much as possible. Is intended.

That is, the numerical range of the roller average diameter d ₁ of the conventional standard roller is determined on the basis of the geometric maximum value that the upper limit value can be arranged on the rotary table, and the lower limit value is crushed by the crusher of the designated model number. When the capacity is larger than the capacity required by the customer, the average diameter of the crushing roller can be reduced within the range where the capacity required by the customer can be reduced to reduce the cost of the equipment. It is possible to significantly reduce the initial cost of related equipment such as roller bearings, swing arms, and arm bearings.

On the other hand, the vertical crusher 1 of the present invention is intended for a fine crushing region for obtaining a finer product particle size than the medium crushing region. For example, a blast furnace slag or a clinker has a specific surface area of 2
Grind more than 500 cm ² / g or 7,000 cm ²
In the case of carbon charcoal production to obtain a specific surface area of / g or more, in the vertical crusher with the standard roller described above, abnormal mill vibrations frequently occur, which hinders continuous stable operation, and lowers the biting efficiency of raw materials. It was studied with the intention of trying to solve the problems such as the reduction of the crushing ability, and the dimensional specifications of the crushing roller were obtained by a crushing test of the cement clinker alone with a test machine (rotating table diameter 630 mm). According to the test results obtained by various changes,
We have identified the dimensional range for obtaining a relatively high crushing capacity. As a result, as shown in FIG. 1, the crushing roller 4 of the present invention has a smaller average diameter d ₂ and width b ₂ than those of the conventional crushing roller (standard roller). The average diameter d ₂ is 0.25 to 0.70 for two rollers, 0.20 to 0.55 for three rollers, and 0.15 to 0.45 for four rollers, with respect to the rotary table diameter D.
The ratio is. Further, the roller width b is 0.19 times the diameter D of the conventional rotary table, but in the present invention it is 0.14 times.

When the roller average diameter of the present invention is compared with the conventional standard roller, the roller average diameter d ₂ of the present invention is 2
The maximum value in the numerical range of the rollers, the three rollers, and the four rollers is close to the lower limit value of the average diameter d ₁ of the standard roller, and the minimum value is about 35% of the maximum value. Also, standard roller average ratio of the diameter d ₁ of the small-diameter roller mean diameter d _2, i.e., the small-diameter ratio R, as shown in FIG. 1, from 0.36 to 0.
The optimum point is in the range of 82, in which vibration is particularly small and the crushing capacity is high, and the optimum point is around 0.75, and the vibration has a single amplitude of 10 to 20 μm.
It was found that the crushing ability was 1.4 to 1.5 times that of the standard roller due to the low vibration. With regard to the roller width b ₂ , taking this point into consideration, 75% of 0.14D of the standard roller b ₁ was adopted.

Considering the reason why the small-diameter roller adopted in the present invention is suitable for the fine crushing region, as shown in FIG.
As shown in Fig. 4, the raw material trapping angle θ
Since the smaller diameter roller is generally larger than the larger diameter roller, the raw material once caught in the crushing roller is less likely to escape to the upstream side of the crushing roller due to the rolling force of the crushing roller.
It is considered that the biting efficiency is improved and the vertical movement of the crushing roller is reduced, which reduces vibration and improves the crushing ability. If the average diameter of the crushing roller is too small, the crushing capability will decrease with a certain region as a boundary because the substantial crushing projected area will decrease even if the biting angle θ increases. It is considered that the minimum value in the numerical range described above indicates this boundary.

As described above, in the vertical crusher of the present invention, the crushing roller having the average diameter and the roller width suitable for the fine crushing area is adopted based on various test results. It is now possible to exert a relatively high crushing capacity with less abnormal vibration.

[0016]

As described above, in the vertical crusher of the present invention, the stable continuous operation without abnormal vibration is continued for the crushing in the fine crushing area, and the relatively high crushing ability can be obtained. Also, the initial cost can be reduced by reducing the size of the crushing roller.

[Brief description of drawings]

FIG. 1 is an explanatory view of comparison between dimensions of a crushing roller of the present invention and a conventional example.

FIG. 2 is a comparative explanatory diagram of a raw material trapping angle of the crushing roller of the present invention and a conventional example.

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

[Explanation of symbols]

1 Vertical Grinder 3A Rotating Table 4 Grinding Roller 5 Arm 6 Shaft 7 Arm 9 Hydraulic Cylinder D Rotary Table Diameter d Grinding Roller Average Diameter d ₁ Grinding Roller Average Diameter (Standard Roller) d ₂ Grinding Roller Average Diameter (Small Diameter Roller) b Grinding roller width b ₁ Grinding roller width (standard roller) b ₂ Grinding roller width (small diameter roller) R Small diameter ratio

Claims (1)

[Claims] 1. A plurality of rotatable crushing rollers are arranged on the upper surface of the outer periphery of a rotary table, and a raw material supplied through a raw material chute hanging above the center of the rotary table is applied to the pulverizing roller at a predetermined crushing pressure. In a vertical crusher that gives and crushes between the upper surface of the rotary table and the peripheral surface of the crushing roller,
The ratio of the average diameter of the crushing roller to the diameter of the rotary table is 0.25 to 0.75 for the two rollers,
The number of rollers was set to 0.20 to 0.55 for three rollers, the range of 0.15 to 0.45 was set for four rollers, and the lateral width of the crushing roller was set to 0.14 times the diameter of the rotary table. Vertical crusher.