JPH0249786B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a pulverizer having a pulverizing roller on a rotary table that rotates as a result of rotation of the rotary table, and a pulverizer equipped with a rotary pressurized separator with an improved material supply structure. It is related to.

In a pulverizer that pulverizes coal, a separator is installed on the top of the pulverizer, and the pulverized material is classified according to its particle size.

However, conventional crushers such as boilers have been pressurized type with high internal pressure, and separators have been of fixed vane type.

This fixed vane type separator has poor classification efficiency and cannot classify fine particles. For example, in the case of coal, the limit for 200 mesh passes is 80-85%.

Therefore, when trying to increase classification efficiency by adopting a conventional rotary separator, conventional rotary separators are applied to negative pressure type mills, so if you try to install them on a pressurized type crusher, it will cause problems inside the crusher. Because the pulverizer is in a pressurized atmosphere, other powder enters the gap between the fixed center chute that hangs down from the center of the upper part of the crusher and the rotary cylinder of the separator that rotates concentrically around it, becomes stuck, and then rotates. This may impede the smooth rotation of the cylinder or cause wear and damage to the outer circumferential surface of the center chute and the inner circumferential surface of the rotating cylinder.

An object of the present invention is to provide a rotary pressurized separator that can be applied to a pressurized mill.

In the present invention, in order to achieve the above object, a center chute (raw material feeding chute) and a rotatable rotary cylinder to which a rotor to which a vane is attached are fixed are arranged concentrically, and a Air (seal air) at a predetermined pressure higher than the pressurized atmosphere inside the crusher is blown downward from an upper position a predetermined distance from the lower end of the rotary cylinder into the annular gap. A structure has been adopted in which water is ejected from all around the lower end.

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

FIG. 1 shows an embodiment of the present invention.
In this figure, the reference numeral 1 indicates a tower-shaped crusher casing, and this casing 1
A rotary table 2 is arranged at the base of the rotary table 2.

A plurality of crushing rollers 3 are rotatably supported on the rotary table 2 by a rotary shaft 5 at a slight distance from the liner 4 of the rotary table 2.

This rotating shaft 5 is swingably attached to a shaft 7 which is rotatably supported on the frame of the crusher via an arm 6. The arm 6 has one end rotatably connected to the tip of the rod 9 of the cylinder 8 as shown by a chain line, and by operating the pressure cylinder 8, the arm 6 is rotated, causing the crushing roller 3 to rotate. It faces table 2.

That is, the pressing force against the object to be crushed held between the rotary table 2 and the crushing roller 3 can be adjusted to vary the crushing effect.

Further, the arm 6 has an arm 6a that is bifurcated at one end, and the tip of the arm 6a is connected to a shock absorber 11 fixed on a support plate 10 disposed approximately in the center of the crusher frame. It is becoming increasingly popular.

A rotary pressure type separator 12 of the present invention is disposed above the crushing roller 3.

FIG. 2 is a schematic diagram showing the main parts of the rotary pressurized separator of the present invention.

The rotary pressurized separator 2 is composed of a large-diameter cylindrical center chute 13 that is vertically arranged and has an open bottom end, and a rotating cylinder 22 that has vanes 14 arranged radially outside the center chute 13.

A rotating cylinder 22 having rotating vanes 14 is attached to the outside of the center chute 13 arranged therein.

The rotary tube 22 has an open lower end, and a large diameter belt pulley 17 is fixed to the outside thereof. It is rotated by a belt 19a stretched over the

20 is a bearing, and 21 is an oil seal that prevents grease from leaking.

In FIG. 2, 15 is a blower device, and 16 is an air conduit. This air conduit 16 is connected and attached at a position above the rotary cylinder 22 and the lower end of the center chute 13 at a predetermined distance apart.

Air at a predetermined pressure higher than the pressurized atmosphere inside the crusher is supplied from the air blower 15 to the annular gap between the rotary cylinder 22 and the center chute 13 for feeding the raw material. This air passes through the annular gap between the rotary cylinder 22 and the center chute 13, and is ejected from the lower end toward the crushing roller 3. At this time, air at a predetermined pressure is supplied into the annular gap from a position above the lower end of the rotary cylinder 22 at a predetermined distance, and the inner circumferential surface of the rotary cylinder 22, which is one of the members defining the annular gap, is Since the air is rotating, the air supplied from the above-mentioned supply position descends while spiraling in the annular passage as the inner peripheral surface of the rotating cylinder 22 rotates while reaching the lower end of the rotating cylinder 22. The flow flows only through a specific part of the body with low resistance, making a so-called short pass or drifting, and the rotating cylinder 2
The air is not discharged only from a partial position of the lower end of the rotary cylinder 22, but is distributed throughout the annular gap and is ejected from the entire circumference of the lower end of the rotary cylinder 22.

Furthermore, since air is supplied at a higher pressure than the pressurized atmosphere of the pulverizer and is carried out by the blower 15, pressure fluctuations within the pulverizer occur, which is a characteristic of this type of air-conveying pulverizer. Even in such cases, air is reliably supplied to the annular gap.

Therefore, even if the inside of the crusher is in a pressurized atmosphere, and even if a gas flow containing a large amount of crushed particles from the crushing section below rises directly above and attempts to enter through the opening at the bottom end of the gap, Fine particles are reliably blown away and their intrusion is reliably prevented.
Therefore, the outer circumferential surface of the center chute and the inner circumferential surface of the rotary cylinder are not damaged by wear, and the smooth rotation of the rotary cylinder is not obstructed.

In addition, according to the experiments of the present invention, when the above-mentioned rotary pressurized separator was operated, 200
It has become clear that fine powder can be classified up to a mesh pass of about 60 to 99%, and the classification efficiency is significantly improved.

By the way, the rotary pressurized separator of the present invention is
The rotation speed, that is, the classification point, can be freely changed by changing the rotation speed of a variable speed motor in a central control room (not shown), making it possible to use it over a wider range of applications. is possible.

As is clear from the above description, since the present invention has the configuration as described in the claims, even if the inside of the crusher is in a pressurized atmosphere, the rotary cylinder 22 and the center chute for feeding raw materials can be easily connected. 13 is filled with air at a predetermined pressure higher than the pressurized atmosphere, and is ejected from the entire circumference of the lower end opening. Furthermore, since this air is supplied by the blower 15, it is reliably supplied and blown out from the lower end even when the gas pressure inside the crusher fluctuates. Therefore, particles that try to enter from the lower end of the annular gap, which is the lower end of the rotating tube 22, can be reliably blown away, and particles are prevented from entering the gap between the center chute 13 and the rotating tube 22. It is possible to prevent wear and tear on the outer circumferential surface of the center chute and the inner circumferential surface of the rotating cylinder due to particulates, and to ensure smooth rotational movement of the rotating cylinder.

Therefore, it can be easily attached to a crusher in a pressurized atmosphere.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of a crusher equipped with a rotary pressurized separator of the present invention, and FIG. 2 is a schematic diagram showing the main parts of the rotary pressurized separator. 1 is the casing of the crusher, 2 is the rotary table,
3 is the crushing roller, 4 is the liner of the rotary table, 5
is a rotating shaft, 6 is an arm, 6a is a bifurcated arm, 7 is a shaft, 8 is a cylinder, 9 is a rod, 10 is a support plate,
11 is a buffer, 12 is a rotary pressurized separator,
13 is a center chute, 14 is a vane, 15 is a blower, 16 is an air conduit, 17 is a large-diameter belt pulley, 18 is a motor, 18a is the output shaft of the motor, 19 is a small-diameter belt pulley, and 19a is a belt , 20 is a bearing, 21 is an oil seal, and 22 is a rotating cylinder.

Claims (1)

[Claims] 1 It has a rotary table and a plurality of crushing rollers that rotate as a result of the rotation of the rotary table placed on the rotary table, and the center shaft is vertically positioned above the crushing rollers in the center of the casing. A pulverizer is equipped with a ute, a rotating cylinder is rotatably installed concentrically outside the center chute, and radially arranged vanes are attached to this rotating cylinder, creating a pressurized atmosphere inside the pulverizer. In the machine, an air conduit connected to the blower is installed at a predetermined distance above the lower end of the rotary cylinder to communicate the annular gap between the rotary cylinder and the center chute with the blower, and pressurizes this gap. A pulverizer equipped with a rotary pressurized separator characterized in that air is blown at a predetermined pressure higher than the atmosphere and is ejected from the lower end of a rotary cylinder.