JPH05154396A - Vertical crusher - Google Patents

Abstract

PURPOSE:To manufacture a vertical crusher for feeding evenly blowing-up rising air flow into a ring passage on the outer periphery of a rotating table and generating little variation in pressure loss in a mill and no abnormal vibration and performing the stabilized continuous operation. CONSTITUTION:A speed reducer 2 with its input shaft protruding to a rotating table 3A is installed, and a motor 2A for rotating the rotating table with the output shaft connected with the input shaft is installed, and a gas duct 20 for feeding blowing-up gas into the ring space passage 14 is installed in the four circumferential directions including the upper space of the motor 2A.

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 cement raw materials, slag, clinker, ceramics, chemicals, etc. by cooperation of a rotary table and a pulverizing roller, and particularly, rises in the mill. The present invention relates to a vertical crusher that equalizes the air flow.

[0002]

2. Description of the Related Art FIG. 4 is a kind of crusher for pulverizing raw materials such as limestone, slag, and cement raw materials 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 has a casing 15 and a rotating shaft 6
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, and by operating the hydraulic cylinder 9, the crushing roller 4 is pressed onto the rotary table 3A. To give crushing pressure to the raw materials. 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 a discharge port for taking out products together with gas, and 17 is a raw material charging chute. Reference numeral 11 is a column base (stand) having a built-in hydraulic cylinder 9,
Bearings (not shown) are mounted and fixed on the top.

In such a vertical crusher, the raw material supplied to the central portion of the rotary table by the raw material charging 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 blows up from the annular space portion 14 between the outer peripheral surface of the rotary table 3A and the inner peripheral surface of the casing,
The pulverized fine powder is entrained by the gas and rises in the casing 15, and the blades 13A of the separator 13 located above
The product having a predetermined particle size is discharged from the discharge port 16 together with the gas and sent to the next step.

[0006]

In the conventional vertical crusher as described above, the raw material which has become a fine powder by being crushed by the crushing roller after being dropped on the rotary table,
The raw materials that do not come into contact with the crushing rollers and are not subjected to any crushing action both overflow the dam ring around the rotary table, fall into the annular space passage, and are rotated by the ascending air current blowing upward from the annular space passage. The fine powder, which is returned to the table or has a relatively fine particle size, is carried to the separator. However, of the raw materials that have fallen almost in the center of the horizontal rotary table, the raw material that is caught by the crushing roller is calculated in terms of the size and number of rotations in the actual machine. The total amount is about 4
It is only a little weak, and most of the rest of the raw material overflows the dam ring with raw stones (raw material particles having the same particle size as that supplied without being crushed). When the flow velocity of the blow-up air current is temporarily reduced or is not evenly distributed around the circumference, the gravity of the falling material overcomes the blow-back energy and passes through the annular space passage, and is discharged from the foreign matter discharge port to the outside of the machine. To be done. If such a stone discharging phenomenon occurs frequently, there is a problem that not only the labor is spent on the processing of the stone discharging but also the grinding efficiency itself is lowered. In addition, when the blow-up airflow to the annular space passage is not evenly distributed around the circumference and there is variation, the pressure loss inside the mill fluctuates drastically, and therefore the pressure loss inside the mill (mill differential pressure) should be kept constant. In the operation in which the raw material supply amount is controlled, the fluctuation of the raw material supply amount is large and it is difficult to continue stable operation, so that there is a problem that abnormal vibration is likely to occur.
Therefore, even if the gas ducts for supplying the blowing gas to the annular space passage are to be evenly arranged from the four circumferences, the gas ducts can be provided from this direction due to the arrangement of the speed reducer and the electric motor for driving the rotary table. Unavoidably,
As shown in FIG. 5, since the gas ducts are attached by installing gas ducts in three directions of the circumference excluding this line, the upflow air amount is not uniform around the circumference.

[0007]

In order to solve the above problems, in the vertical crusher of the present invention, a plurality of rotatable crushing rollers are arranged on the upper surface of the outer peripheral portion of the rotary table, and the rotary table central portion is provided. A vertical crusher for crushing the raw material supplied to the crushing roller by applying a predetermined crushing pressure to the crushing roller between the upper surface of the rotary table and the peripheral surface of the crushing roller, and an annular space passage for gas blowing on the outer circumference of the rotary table. In a vertical crusher equipped with, a speed reducer having an input shaft protruding vertically downward is arranged below the rotary table, and an electric motor for driving a rotary table is connected to which an output shaft is connected to the input shaft. In addition, the gas ducts for supplying blown gas to the annular space passage are arranged in four directions of the circumference including the space above the electric motor.

[0008]

In the vertical crusher of the present invention, unlike the prior art, the gas ducts are connected to the annular space passage from the four directions of the circumference to take in the blowing gas, so that the annular space passage has a substantially uniform circumference. An updraft can be formed. Therefore, the amount of stones discharged is small, and the pressure loss in the mill is stable. Therefore, as a result of the raw material flowing smoothly on the rotary table and being crushed, the vibration value is small and stable operation is performed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of a vertical crusher of the present invention, FIG. 1 is an overall longitudinal sectional view, FIG. 2 is a perspective view of a main part, and FIG. 3 is a schematic plan view of the main part. As shown in the figure, turntable 3
A is loaded and connected to the output shaft of the speed reducer 2 whose input shaft projects vertically downward, while the input shaft of the speed reducer 2 is housed in a pit drilled below the output shaft and projects upward. It is connected to an electric motor having a shaft through a coupling. Then, one of the gas ducts 20 communicating with the annular space passage 14 and the gas supply passage 14A is attached to the casing 15 immediately above the speed reducer 2. Therefore, in the present invention, as shown in FIG. 2 and FIG.
Four gas ducts 20 are provided between each of the air gaps so that the blow-up gas can be supplied to the annular space passage 14 substantially evenly. In this way, the gas duct 20 has a circumference of 90 °.
On the other hand, four sets of the crushing roller 4, the hydraulic cylinder 9, and the column base 11 are evenly arranged at every 90 ° in the middle.

With the above-described structure, the gas ducts are evenly arranged at four positions between the column bases, so that the blow-up gas is supplied to the annular space passage 14 almost evenly, and the gas is uniformly fed into the vertical crusher 1. By forming an updraft, the rotary table 3
Since coarse particles that overflowed A can be blown back evenly around the rotary table, stone discharge is small, fluctuations in pressure loss inside the mill are small, and stable operation can be continued.

[0011]

As described above, in the vertical crusher of the present invention, as a result of being able to form a substantially uniform updraft in the annular space passage, less stones are discharged and fluctuations in the pressure loss in the mill are reduced. A stable continuous operation can be continued,
Since the vibration value is small and good pulverization is performed, the production efficiency is improved.

[Brief description of drawings]

FIG. 1 is an overall vertical sectional view showing an embodiment of a vertical crusher of the present invention.

FIG. 2 is a perspective view of essential parts showing an embodiment of a vertical crusher of the present invention.

FIG. 3 is a schematic plan view of an essential part showing an embodiment of a vertical crusher of the present invention.

FIG. 4 is an overall vertical sectional view of a conventional vertical crusher.

FIG. 5 is a schematic plan view of a main part of a conventional vertical crusher.

[Explanation of symbols]

 1 Vertical Grinder 2 Speed Reducer 2A Electric Motor 3A Rotary Table 4 Grinding Roller 5 Arm 6 Rotating Shaft 7 Arm 9 Hydraulic Cylinder 11 Pillar (Stand) 13 Separator 14 Annular Space Passage 14A Gas Supply Channel 15 Casing 20 Gas Duct

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 are provided. A vertical crusher for crushing between a surface and a vertical crusher having an annular space passage for gas blowing on the outer circumference of a rotary table, in which the input shaft vertically projects downward below the rotary table. And an electric motor for driving a rotary table in which an output shaft is connected to the input shaft, and a gas duct for supplying blown gas to the annular space passage in the space above the electric motor. A vertical crusher characterized by being arranged in four directions including the circumference.