JPH0444182Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a crushing pin constituting an impact crusher.

[Conventional technology]

As shown in Fig. 1, the conventionally used impact crusher has two discs R equipped with a large number of pins P facing each other, and these discs R are rotated at high speed (to reduce the amount of pulverized raw material). Depending on the nature, the rotation direction may be reverse rotation or rotation in the same direction), and the raw material is ground into ultra-fine particles by the meshing of many pins P, and the relative rotation speed of these disks R is an ultra-high speed of 210 m/sec. However, the impact and repulsion generated by the pin P interact to cause pulverization.

The materials that can be crushed by such a crusher include oils and fats, paint pigments, food products such as dairy products, wax, cocoa beans, fragrances, chemicals, plastics, mineral products, metallurgical products, etc. Used to grind a wide variety of materials.

In addition, some crushed materials have elasticity,
Fibrous, starchy, and viscous materials are crushed, but especially in the case of viscous materials, the centrifugal force generated from high-speed rotation reduces the adhesion of crushed materials between the pins P, and the inside of the grinding chamber. The suctioned wind power also has the effect of cooling the heat generated during the crushing process.

Furthermore, depending on the type and properties of the raw material to be pulverized, the mutual angle, rotational direction, and rotational speed of the discs R may be adjusted.

[Problem that the invention aims to solve]

As mentioned above, a crusher with a large number of rotating pins has excellent properties, but since the pins themselves are made of steel, they wear out when dealing with hard materials to be crushed such as silica sand and fishmeal. Since the degree of damage is large (according to steel pins, the pin diameter becomes thinner in about 5 minutes with silica sand), it is also possible to use steel pins with titanium carbide (TiC) coated by thermal spraying on the surface. However, the wear-resistant material was insufficient, and the pins had to be replaced and repaired frequently.

In addition, steel pins have some disadvantages, such as rusting and abrasion that can cause impurities to be mixed in when used to crush chemicals or high-purity materials.

[Means for solving problems]

In view of these circumstances, the pin is characterized by being made of zirconia ceramic, which is highly hard and wear-resistant, and has high strength, especially in the parts where the wear is severe.

〔Example〕

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.

FIG. 2 shows a crushing pin 1, in which a small diameter portion 2a is integrally formed at the tip of a metal base 2, and a flange portion 2b is integrally formed at the rear end, and the small diameter portion 2a is formed by a tubular body 3 made of zirconia ceramic. The metal base 2 and the tubular body 3 are firmly fixed and integrated by being inserted into the inner hole 3a of the tube and held together with an adhesive s.

As described above, the crushing pin 1 according to the present invention is equipped with a tubular body 3 made of zirconia ceramic at its tip, and as an example of its specifications, the total length is 46 mm.
mm, metal base diameter 10mm (flange diameter 12mm),
The outer diameter of the tubular body 3 is 9.8 mm, and the tip ridge 4 of the tubular body 3 is finished with a roundness of 1R, and the outer surface is highly mirror polished.

Furthermore, the zirconia ceramic material that is the constituent material of the tubular body 3 contains ZrO ₂ and stabilizers such as yttoria (Y ₂ O ₃ ), magnesia (MgO), and calcia (CaO).
It is formed by molding and firing a suitable amount of at least one of the following, and has the highest toughness and strength among various types of ceramics.

Note that an epoxy adhesive is effective as the adhesive used when inserting and fixing the small diameter portion 2a of the metal base 2 into the inner hole 3a of the tubular body 3.

The zirconia ceramic crushing pin configured as above, the conventional steel (SK material) pin, and the steel pin coated with a titanium carbide coating were attached to a disk under the same conditions using silica sand as the object to be crushed. As a result of repeated mounting tests, the crushing pin according to the present invention has approximately 1/20th the amount of wear compared to steel pins.
The service life is 24 times longer in all cases, and approximately 18 times longer than grinding pins coated with titanium carbide.
It has been confirmed that the lifespan is twice as long.

[Effect of idea]

As mentioned above, the crushing pin of the present invention is constructed by combining a metal base and a zirconia ceramic tubular body, so it is not only easy to manufacture, but also has extremely high impact strength and wear resistance, and has a long life. It can provide long and stable grinding characteristics.

Furthermore, it is less likely to rust or be mixed into the material to be crushed as impurities due to wear, so it not only constitutes an excellent pulverizer, but also produces excellent fine powder as a result.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of a crusher using crushing pins, and FIG. 2 is a partially cutaway sectional view of only the crushing pins constituting the crusher. 1...Crushing pin, 2...Metal base, 3...Tubular body.

Claims (1)

[Scope of utility model registration request] The small diameter part formed on the tip side of the metal base _is
The main component is inserted and fixed into the inner hole of a bottomed tubular body made of zirconia ceramic containing at least one of Y ₂ O ₃ , CaO, and MgO, and the tip ridge of the bottomed tubular body is rounded. A crushing pin formed by forming.