JPS596894Y2 - Special corn cave for crushing in corn crusher - Google Patents

Description

[Detailed description of the invention] This invention relates to a corn cave for crushing a corn crusher, and particularly relates to an improvement of the corn cave for crushing to increase throughput and obtain products with good grain shape. .

As is well known, corn crushers are widely used, and it is known that there is a certain organic relationship between the throughput, product quality, and wear of the corn cave.

In order to facilitate understanding of this invention, the relationship between the throughput, product quality, and wear of the corncave will be explained using the coarse crushing concave and fine crushing concave shown in the figure as examples.

In the figure, a cone cave 1 indicated by a two-dot chain line is a cone cave for crushing, and a cone cave 4 indicated by a dotted line is a cone cave for crushing.
This is a cone cave for coarse crushing, and the difference between the two is that the intersections B and B' of part A forming a predetermined angle with the mantle 2 and part C parallel to the mantle 2 are located at the eccentric rotation center O of the mantle 2. It is understood that the farther this intersection point is from the center of eccentric rotation of the mantle, the more coarse it will be (downward).

Also, from the positional relationship of the above-mentioned intersections B and B', the difference in the shape of both cone caves is due to the size of the angle between them and the mantle 2,
The difference is in the length of the parallel portion C, and it is understood that the larger the angle and the smaller the parallel portion, the coarser the crushing.

Therefore, when comparing the throughput for both of the above, if the diameters of the mantle at the intersections B and B' are Di and D2, the throughput of the crushing concave 1 decreases by (D./D2) This has been confirmed by actual equipment.

Therefore, it can be understood that in order to increase the throughput, it is better to position the intersection B as low as possible, increase the angle with the mantle, and reduce the parallel portion.

When considering this from the perspective of the crushing process, first, while the material to be crushed with a large particle size is crushed in the A part, it is sequentially crushed in the parallel part C.
The materials to be crushed will be transferred to

However, when reaching the parallel part C from the wide part A forming a certain angle with the mantle, it suddenly narrows at the intersection B, so the material to be crushed is temporarily dammed up in this part, and The amount of processing will be restricted.

Also, due to this damming, the packing density of the material to be crushed differs,
The packing density is highest at the damming part, and the packing density is smaller in the C part than in the A part, and furthermore, the part with the higher packing density wears out more severely.

Next, regarding the particle shape, it is generally known that the higher the packing density of the crushed material, the better the particle shape.

Furthermore, looking at the crushing process in the parallel section C, where the packing density is lower than that of the section A, it is found that when the packing density is low, the objects to be crushed are not ground together, resulting in relatively flat grain shapes. or,
It has been experimentally known that if the parallel portions C are too long, the packing density will further differ between the parallel portions C, and not only will a good grain shape not be obtained, but grain refinement will not progress.

For these reasons, the position of the intersection B between the part A widened at a predetermined angle with the mantle and the parallel part C parallel to the mantle is set as far away as possible from the center O of the eccentric rotation axis of the mantle, and at each part of the fracture surface. It is understood that it is best if the packing density of the material to be crushed is uniform.

Therefore, the object of this invention is to obtain a cone cave for crushing that can satisfy the above technical contents as much as possible.

This idea, which is in line with the above objectives, is based on the results obtained through numerous experiments. The length of the effective fracturing surface is set in the range of 10 to 100 cm with respect to the maximum diameter of the cone cave, and the length of the effective fracturing surface is set in the range of 1 to 100 mm below the effective fracturing surface, parallel to the mantle. A parallel part is provided, the length of this parallel part is 0.5 or less of the length of the effective crushing surface, and a line tangent to the parallel part extends from this parallel part to the stepped part, and The curve is made to have a continuous force in the range of 0 to 2F to improve the filling condition of the material to be crushed, and then the thin wall part is constructed from the stepped part to make it compatible with the cone cave for coarse crushing. The gist of this is to make it effective.

Next, an embodiment of this invention will be described below with reference to the drawings.

A two-dot chain line 1 shows a conventional cone cave for crushing, and 2 is a mantle which swings eccentrically around an eccentric origin O.

Reference numeral 3 indicates an outer frame casing to which a cone cave is installed, a dotted line 4 indicates a conventional cone cave for coarse crushing, and 5 indicates an outlet gap for crushed material from the cone cave.

The fine grinding cone cave 1 and the coarse grinding cone cave 4 are shown for comparison.

6 is a cone cave for crushing, which is the gist of this invention, and has a thinner part 7 from the upper part, a sharp step part 8 continuous to it,
Then, a convex shape with respect to the mantle 2 continuing from the stepped portion 8,
That is, the curved portion 9 forms a curved surface that gradually recedes outward, and further extends from the parallel portion 10 via a portion B'.

The parallel portion 10 is in the form of a parallel tangent to the mantle 2 where the curved portion 9 asymptotically approaches and moves away from the mantle 2.

According to the above-mentioned theory, the length L of the curved portion 9 and the parallel portion 10, which constitute the thick effective crushing surface, is set to be within h-2 of the maximum inner diameter D of the cone cave, and in addition, the parallel portion The angle .alpha. of the tangent of the curved section 9 from the terminal end B' of 10 to the stepped section 8 with respect to the mantle 2 is set in the range of .alpha..degree.=0 to 2F from experimental values.

By the way, the shape of the mantle 2 above the parallel part 10 of the effective crushing action surface and the cone cave 6 relative thereto is such that the angle α° shown in the figure is larger than the angle that is said to be able to bite the processed material. Although it is possible to design the shape as described above, when actually operating a cone crusher for crushing, it is possible to effectively increase the throughput by designing the L part at the lowest end. It cannot be used.

When the lid is closed and the cone crusher is operated, generally in order to utilize the maximum processing capacity of the crushing chamber, a certain amount of material to be processed that is balanced with the maximum processing capacity is continuously fed into the crushing chamber in a circular manner. Uniform supply in the circumferential direction is an essential condition, and if this essential condition is met, the crushing chamber will never be empty and a constant high filling rate of the material to be processed will always be maintained, and the maximum This is because efficient crushing is performed using the crushing capacity, and for this purpose, it is necessary to store the processed material up to a predetermined height above the crushing chamber.

Therefore, if the shape of the crushing chamber formed by the cone cave 6 and the mantle 2 is configured to have a wedge-shaped cross section that is an extended shape due to the above α°, the processed material stored there will be constantly oscillated. Because of the movement, the pressure applied to the material to be processed that is about to enter the crushing chamber changes depending on the storage height of the material to be processed.

Of course, if there is no rocking motion, the pressure will not rise above a certain value even if it is stored above a certain height.

Therefore, if the crushing action chamber is designed in the shape of the above-mentioned α° extension, the above-mentioned essential conditions will be satisfied when the crushed material is stored up to a predetermined height, but if the storage height is higher than that, the crushing action will be effective. The pressure applied to the processed material that is about to enter the chamber becomes too high, resulting in an oversupply condition, which applies unreasonable force to each part of the cone crusher, causing the drive motor (not shown) to stop. There is a risk that this will occur.

Therefore, it is necessary to always maintain the storage height at an optimum level, but this is impossible in actual operation, and to prevent overloading and stoppage of various parts of the crusher due to oversupply, it is necessary to maintain the storage height below the optimum height. You can only drive when
Can only operate at 60-80% of normal maximum capacity.
Become.

In order to deal with the above problem, in this invention, the shape of the crushing chamber is provided with a sharp step 8 as described above, and a cone cave 6 is formed above the step so that the gap size with respect to the mantle 2 is extremely large. The walls are parallel and thin to give the impression of a rough stone adjustment chamber.

Therefore, in the cone crusher for fine crushing configured as shown in the figure, even if the storage height of the processed material fluctuates greatly, there will be no stoppage due to overload, and the cone crusher will always maintain the original capacity of the crushing chamber. This allows the system to operate at its maximum processing capacity.

In the above structure, the material to be crushed is supplied from the upper input port (not shown) into the crushing chamber between the mantle 2 and the thin walled part 7 of the crushing concave 6, and then passed through the stepped part 8. Enters the effective crushing area.

Then, while being effectively and continuously subjected to biting action and crushing action at the curved portion 9, the particles are subjected to a fine-graining action at the parallel portion 10, and are discharged from the outlet gap 5.

During this period, even if the object to be crushed is accelerated by crushing on the effective crushing surface and attempts to slide down the slope of mantle 2 (actually, this does not happen much because the degree of filling is high), it will always be crushed. Ru.

In addition, in the actual design, there are restrictions on the input particle size and motor output, so the width W of the input port is the maximum dimension of the input lump, and the angle α° with the mantle is 2" or less, so that the effective crushing action surface is set. If the length L is within the above range, the load on the motor will be within the rating of conventional products.

Experimental examples based on the above embodiments are shown in the following table.

However, the above numerical values are the results of an experiment using basalt with the same throwing particle size and the same exit gap, while adjusting the amount of input so that the output of the motor would be constant.

Further, cubicity is the proportion of the whole material having a ratio of maximum length to minimum length of 3 or less.

As mentioned above, according to this invention, the boundary between the wide part and the parallel part of the crushing concave with respect to the mantle is set at a low position as x"o" + of the diameter of the concave, and
The length of the effective crushing action surface was set to the theoretically necessary minimum based on the falling length of the material to be crushed on the mantle slope, and moreover, it was made less than half of the parallel part required for grain refinement, so the packing density of the material to be crushed was made uniform. This has an excellent effect of promoting grain refinement and producing grains with good shape.

Furthermore, based on experiments, the effective crushing action surface has a curved part of O~2.
If the continuous curve is formed within the range of F, biting will act continuously, and in addition, since the parallel part is a tangent line parallel to the mantle of the curved part, the transition from biting to fine-grained crushing will be smooth. Moreover, since the continuous part B' of the parallel part and the curved part is provided sufficiently below the cone cave, there is also the effect that the eccentric throw becomes large and the throughput becomes extremely large.

As you can see from the figure, by making the upper thin-walled part thin so that its inner surface is straight in cross section, it uses less than half the material of a conventional crushing concave, resulting in a significant weight reduction.
There are also benefits associated with cost reduction and increased input volume.

As mentioned above, by providing a thin section above the crushing surface in the cone cave with a sharp step, it is possible to avoid overloading the device even if the storage height of the processed material fluctuates greatly. It is possible to achieve the excellent effect of being able to operate at maximum processing capacity without causing any stoppage.

[Brief explanation of the drawing]

The drawing is a structural sectional view illustrating an embodiment of the invention in comparison with the prior art. 9, 10, L... Thick wall effective crushing surface, 8
...Stepped portion, 7... Thin wall extension surface, 6
..... Corn cave for crushing, 2 ..... mantle, 10 ..... parallel part, 9 ..... curved part, α ..... opening angle.

Claims (1)

[Scope of utility model registration request] In the crushing cone cave of a cone crusher, which is cut from the effective crushing surface of the thick wall portion and the extension surface of the thin wall portion that is integrally continuous with the crushing surface through a sharp step, the effective crushing surface of the thick wall portion is The length L of the working surface is in the range of h to 2 with respect to the maximum diameter of the cone cave, a parallel part parallel to the mantle is provided at the lower part of the effective crushing working surface, and the length of the parallel part is set to the length of the effective crushing working surface. Shape the curved part of the effective crushing surface with a curved convex surface with the parallel part as a tangent, and use the tangent of the curved part with the parallel part as the tangent. The angle between the tangents of each part of the curved part of the effective crushing surface and the reference line is an opening angle of up to 2F, and the stepped part is shaped from the line point of any tangent with the maximum opening angle of 2F. A special cone cave for crushing in a cone crusher, characterized in that the vertical cross-sectional shape of the thin-walled portion continuous with the stepped portion has an inner surface substantially linear.