JPH0222041Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a crusher that crushes concrete aggregate for civil engineering construction, industrial raw materials, etc. to produce fine aggregate and fine particles of industrial raw materials.

FIG. 1 is an explanatory cross-sectional view of the crusher according to the present invention, in which 1 is a table with a crushing surface on the upper surface, 2 is a plurality of rollers provided with a crushing surface around the table 1, and 3 is a table having a crushing surface on the upper surface; A drive shaft that drives the table 1, 4 is a raw material input port, 5 is a product discharge port, 6 is a separator, 7
8 is an air intake port, and 9 is a casing.

The raw material inputted into the crusher from the raw material input port 4 falls onto the rotating table 1, from which it moves to the periphery due to centrifugal force and gets caught in the gap between the crushing surface of the roller 2 and the crushing surface of the table 1. crushed. Among the crushed raw materials, the generated fine powder is discharged to the outside of the system through the separator 6 by a required amount of air supplied from the air intake port 8. The crushed raw materials other than fine powder fall below the periphery of the table 1 and are passed through the scraper plate 7 which is rotated by the drive shaft 3.
The product is collected by the product outlet 5 and recovered from the product outlet 5.

The present invention discloses the configuration of this crushing surface in such a crusher, thereby producing products with good product shape, that is, products with roundness, uniform particle size, and flat shape. We are trying to provide a crusher that has been improved in various aspects, such as obtaining fewer products, improving yield, that is, increasing the ratio of product to raw material input, and stable operation with less noise and vibration. It is something to do.

That is, the present invention is characterized in that, in the crusher, each of the crushing surfaces of the table and rollers is formed with a coarse crushing part and a grinding part, and these coarse crushing parts are configured with specific wave-shaped grooves. It is a crusher.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIGS. 2 to 6, 21 is a coarse crushing part that constitutes the crushing surface of the roller 2, 22 is a grinding part,
A corrugated groove 24 as shown in FIG. 3 is provided around the end portion 23 of the coarse crushing portion 21. As shown in FIG. The wave-shaped grooves 24 are formed continuously and gradually become shallower so as to disappear when reaching the grinding portion 22.

The wavy grooves 24 are formed, for example, in the shape of a sine curve, and the crests and troughs of the grooves are curved with approximately equal radii and formed at equal pitches. In other words, in Fig. 5, the pitch P between each groove is 70 to 110 mm,
The curves forming the peaks and valleys each have a radius R of 15
~25 mm, and the depth H of the groove at the end 23 (see Figure 4) is 60-70% of the maximum grain size of the rough stone.

When the pitch P is 70 mm or less, the crushed fine powder tends to clog, and when the pitch P is 110 mm or more, the crushing effect decreases due to the particle size of the raw stone actually used.

If the radius R of the curve forming the peaks and valleys is less than 15 mm, the crushed fine powder will easily clog.
When the diameter is 25 mm or more, the crushing effect decreases in relation to the grain size of the rough stone actually used.

Furthermore, if the depth H of the groove at the end portion 23 is less than 60% of the maximum grain size of the raw stone, the raw stone and crushed stone will easily become clogged, and if it is more than 70%, the crushing effect will decrease.
Furthermore, there is a risk that the crushing pressure will not be fully utilized.

Next, the proportion of the crushing part 21 and the grinding part 22 on the crushing surface of the roller 2 is determined by subtracting the length of the grinding part 22 from the length L of the crushing surface in the cross section shown in FIG.
(i.e. 60% to 60% of the length of the coarse crushing section 21)
~40%).

Here, when the length of the grinding section 22 is set to 40% or less (that is, the length of the grinding section 21 is set to 60% or more), the amount of fine powder obtained is small compared to the amount of raw stone input, and the coarse powder is Many grains remain.

On the other hand, when the length of the grinding section 22 is set to 60% or more (that is, the length of the coarse grinding section 21 is set to 40% or less), excessive grinding occurs, which is not preferable.

Next, on the crushing surface of the table 1, 31 is the coarse crushing part, 32 is the same crushing part, and 33 is the coarse crushing part 31.
34 is a step provided in the coarse crushing part 31, and the protrusion 33 has a corrugated groove 3.
5 is formed. That is, a plurality of wavy grooves 35 having a triangular cross section are provided around the circumference.

The wave-shaped grooves 35 have almost the same shape as the wave-shaped grooves 24 of the roller 2, but the pitch between each groove is 80 to 120 mm,
The curves forming the peaks and valleys each have a radius R of 25
Formed to ~55mm.

The ratio of the coarse crushing part 31 and the grinding part 32 to the length L' of the crushing surface of the table 1 (see FIG. 6) is approximately the same as that of the roller 2.

The groove depth H' of the corrugated groove 35 is approximately the same size as the grain size of the raw stone used, for example, 40 to 60 mm.

When the rollers 2 are arranged on the table 1 configured in this way, the gaps between the respective crushing surfaces are wide between the crushing surfaces and narrow between the grinding surfaces.

The crusher of the present invention is constructed as described above, and the rough stone dropped from the raw material chute 4 falls onto the table 1 and is moved outward by the centrifugal force generated by the rotation of the table 1. Move to
It is caught between the crushing surface of the table 1 and the crushing surface of the roller 2. In other words, since the gap between the coarse crushing part 31 of the table 1 and the coarse crushing part 21 of the roller 2 is wide and the corrugated grooves 24 and 35 are formed, the raw stone is easily bitten and the raw stone is crushed into large pieces. is cut into small pieces of appropriate size. As the table 1 rotates, the divided rough stones are sequentially passed through the grinding section 32 of the table.
Then, the roller 2 moves into a narrow gap between it and the grinding section 22 . The crushed raw stones are densely packed between the grinding sections, softened and sized, and form a desirable rounded product grain shape.

Note that by shortening the length of the grinding section, this granulation process can be shortened and over-grinding of the product can be prevented. In addition, as described above, since the raw stone is well caught in the crushing section, the roller 2 rotates smoothly due to this frictional force, thereby suppressing the occurrence of vibration.

Next, the specific specifications of the crusher according to the present invention are as follows.

Roller large diameter part = 1200φ, small diameter part = 930φ, length L = 520mm, grinding part length = 230mm, coarse crushing part length =
290mm, corrugated groove pitch P=80mm, corrugated groove R=16
mm, depth of corrugated groove H = 40mm, table grinding part length = 320mm, coarse grinding part length 310mm (including step 80mm),
Waveform groove depth H′ = 50mm, waveform groove pitch = 90mm,
Waveform groove R (peak) = 30mm, waveform groove R (valley) = 40mm, maximum rough stone grain size 60mm.

As described above, according to the crusher of the present invention, the crushing surfaces of the rollers and table are divided into a coarse crushing part and a grinding part at a predetermined ratio, and each coarse crushing part is provided with corrugated grooves as in the above configuration. As a result, the resulting product shape is rounded and has a good grain shape, with fewer flat particles. For example, when crushing hard andesite with a size of 5 to 40 mm, a performance rate of 58 to 60% was obtained. In addition, the ratio of product volume to raw material input is large;
In the case of the same hard andesite, yield rates of 75-85% were obtained. This is a crusher that does not have continuous wave-shaped grooves formed in a curved line as in the present invention on the crushing surface of the roller and table (see Japanese Patent Laid-Open No. 58-61839).
The actual rate of 53-55% and yield rate of 55-65% obtained when similar tests were conducted with conventional roller mills.
greatly improved compared to. Furthermore, since the crushing section rotates the rollers and feeds the raw material well, there is little noise and vibration, and stable operation is possible.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional explanatory view of a crusher according to the present invention, Fig. 2 is a partially enlarged explanatory view of the crusher, and Fig. 3 is a diagram showing wave-shaped grooves formed on the crushing surfaces of the table and rollers of the crusher. A-A arrow view in Figure 2, Figure 4 is an explanatory side cross-sectional view of the crushing surface of the same roller, Figure 5 is an explanatory view of the corrugated grooves formed on the crushing surface of the roller, and Figure 6 is the crushing of the same table. It is a side cross-sectional explanatory view of a surface. DESCRIPTION OF SYMBOLS 1... Table, 2... Roller, 21... Rough crushing part of roller, 22... Grinding part of roller, 24...
Wave-shaped groove of roller, 31... Coarse crushing part of table, 3
2... Grinding part of table, 33... Protrusion, 34...
...step, 35...corrugated groove on table.

Claims (1)

[Scope of utility model registration request] A rotating table with a crushing surface and a plurality of rollers with crushing surfaces are arranged opposite the crushing surface of the table, and the crushing surfaces of the table and rollers are sequentially roughened from the center of the table toward the outer periphery. In a crusher formed of a crushing section and a grinding section, the coarse crushing section of the roller has a continuous wave-shaped groove whose cross-sectional profile disappears in a curved line when it reaches the grinding section; Each of the coarse crushing parts is provided with a protrusion with a waveform groove that is approximately the same shape as the waveform groove of the roller, and the proportion of the crushing part formed on each crushing surface of the table and roller is centered on the rotation axis of the table or roller. A crusher characterized in that the length of the crushing surface of the table or roller appearing in the cross section is 40 to 60% of the length of the crushing surface of the table or roller.