JPS6051851B2 - Grinding machine equipped with a rotary separator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pulverizer having a pulverizing roller on a rotary table which is driven to rotate as the rotary table rotates, and which is equipped with a rotary separator with an improved material supply structure. It is.

2. Description of the Related Art Conventionally, a pulverizer is known that has a pulverizing roller mounted on a vertically arranged large-diameter rotary table and which is rotated as a result of rotation of the rotary table. An example of this type of crusher is shown in FIG. In FIG. 1, reference numeral 1 indicates a tower-shaped crusher casing, and a rotary table 2 is disposed at the base of the casing 1. As shown in FIG. On this rotary table 2, a plurality of crushing rollers 3 are rotated.
'Sat ALtll■'I ゝ挤hold A4-, I-F official p
It is rotatably supported by an axle 5. This rotating shaft 5 is swingably attached to a rotating shaft 7 which is rotatably supported on the frame of the crusher via an arm 6. One end of the arm 6 is rotatably connected to the tip of the rod 9 of the cylinder 8 as shown by the chain line, and the arm 6 is rotated by operating the pressure cylinder 8, and the rotary table 2 of the crushing roller 3 is rotated. I am having them face to face. 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. The arm 6 has a bifurcated arm 6a 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 center feeding chute 12 is installed above the crushing roller 3 in a vertically arranged manner.

A separator 14 having radially fixed vanes 13 is provided so as to surround the chute 12. A pulverizer with this kind of structure is suitable for pulverizing coal for boilers.Depending on the brand of coal, there are coals with high moisture content and high adhesion, so the pulverizer is suitable for pulverizing coal for boilers. The center feeding method is adopted to introduce coal by vertical drop, which causes the least amount of adhesion to the coal.

In addition, for boiler coal, etc., the product particle size of pulverized coal is 75-80% (90 μR22-15
%), classification using such a fixed vane 13 is sufficient to satisfy the purpose.

On the other hand, the one shown in Fig. 2 is a pulverizer used for pulverizing low-humidity raw materials such as cement raw materials.This pulverizer has a side feeding chute 15, and above it a rotor 1
6 is mounted supported by a shaft 17, and this rotor 16 is rotated by a motor 18.

Since raw materials such as cement raw materials and tank cans do not have adhesive properties like coal, a side feeding method may be used as a material feeding method. However, since the classification of products is done by the centrifugal force generated by the rotation of the rotor 16, by increasing the rotation speed of the rotor 16, when crushing tankard, 325 mesh bath 95% (
88μRO. Classification to the extent of 1%) is also possible. However, in pulverizers for obtaining pulverized coal for cement firing, metallurgical furnace heating, and other industrial uses, rather than pulverizers for coal for boilers, due to its combustion characteristics (burning management), compared to coal for boilers. The particle size of pulverized coal is required to be as small as 88μR5 to 10%.

In order to obtain pulverized coal with such a particle size, it is not possible to obtain the desired product particle size using a fixed vane type separator as shown in FIG.

Therefore, in order to satisfy the product particle size, it is necessary to employ a rotary separator having a rotor as shown in FIG.

However, because coal is sticky, it is not possible to adopt the side feeding method shown in Figure 2. An object of the present invention is to obtain a pulverizer capable of classifying sticky coal and the like into finer particles.

In the present invention, a rotary center feed type separator is employed to achieve the above object.
4 Below, the present invention will be described in detail based on embodiments shown in the drawings. Figures 3 and 4
The figure is for explaining one embodiment of the present invention, and parts other than the separator portion are omitted.

The separator 19 of the present invention has a cylindrical large-diameter center chute 20 arranged vertically, and a rotary cylinder 2 having vanes 21 arranged radially outside the center chute 20.
It consists of 9.

A large-diameter belt pulley 24 is fixed to the outside of the rotating cylinder 29, and a belt 26a is stretched between the belt pulley 24 and a small-diameter belt pulley 26 fixed to the force shaft 25a of the motor 22. It is rotated by In addition,
A rotating cylinder 29 having rotating vanes 21 is attached to the outside of the fixed center chute 20 to form a rotating separator.

Reference numeral 27 is a bearing, and reference numeral 28 is an oil seal that prevents grease from leaking.

A suitable material for the center chute 20 is stainless steel.

Since the present embodiment is constructed as described above, highly humid and highly adhesive materials such as coal are vertically dropped through the center sheet 20 and crushed by the crushing rollers 3. The particles are blown up by the hot air supplied from a hot air supply means (not shown) and subjected to a classification action by the rotating vane 21, thereby making it possible to obtain a product with fine particles of about 88 μR 1% as described above.

As is clear from the above description, since the present invention is equipped with a rotating center-feed separator, it is an excellent pulverizer that can classify highly humid and highly adhesive materials into extremely fine products. can be provided.

[Brief explanation of the drawing]

FIGS. 1 and 2 are longitudinal sectional side views illustrating different conventional structures, and FIGS. 3 and 4 are longitudinal sectional side views and plan views of a separator portion illustrating one embodiment of the present invention. 1...Casing, 2...Rotary table, 3...Crushing roller, 12, 20...
Center chute, 13...Fixed vane, 15.
...Side feeding shoot, 16...
...Rotor, 19...Rotary separator, 21.
... Vane, 24, 26... Belt sprocket,
26a...Belt, 27...Bearing, 28
...Oil seal, 29...Rotating cylinder.

Claims (1)

[Claims] 1 It has a rotary table and a plurality of crushing rollers that are driven to rotate with the rotation of the rotary table placed on the rotary table, and is vertically centered with the crushing rollers positioned above the crushing rollers in the center of the casing. In a crusher equipped with a rotary separator characterized by a chute, a rotating cylinder is provided outside the center chute, vanes arranged radially are attached to the rotating cylinder, and the vanes are inserted through a belt. A configuration in which the motor rotates at a predetermined rotational speed.