Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
  • B02C13/26—Details
  • B02C13/282—Shape or inner surface of mill-housings
  • B02C13/284—Built-in screens

Definitions

• the invention relates to a method and a device for comminuting bulk goods, in particular grain, which are used in the compound feed industry and in the milling industry.
• a large number of grinding devices are known, in which a rotor with striking elements, which is surrounded on the entire circumference or only partially with a sieve, is arranged in a housing.
• the material is fed into a work zone, i.e. a zone between the striking elements and the inner surface of a chamber (sieve, baffle plate), which encloses the rotor and comminutes it there.
• a work zone i.e. a zone between the striking elements and the inner surface of a chamber (sieve, baffle plate), which encloses the rotor and comminutes it there. Since the striking organs move directly in the layer of comminuted material, the grinding is dominated by the rubbing principle, which in the end results in over-crushing of the particles, excessive energy consumption and intensive wear and tear on the striking organs and the rotor.
• a device of the type mentioned above is known from DE 1 250 721. This discloses a beater mill in which rotating beater elements interact with friction or baffle jaws arranged in a sieve basket between sieve plates. A particularly high energy consumption arises when using the embodiment according to FIG. 4 with a two-armed cross beater and three friction jaws.
• GB 1 41 1 085 discloses an impact mill in which the flow of the material that has entered the grinding chamber of the mill is influenced by the special conical design of the rotor end. This can reduce the excessive wear of the rotor.
• the aim of the present invention is to reduce the energy consumption during grinding, to increase the uniformity of the grain size of the product and in increasing the lifespan of the work organs and the sieve.
• the device according to the invention has a housing with inlet and outlet nozzles, a racket rotor and a screen with a plurality of deflection elements which surround the pop rotor.
• the baffles on the circumference of the sieve are arranged at the same or varying distance from the rackets.
• the deflection elements have a smooth surface with an inclination of 20 to 80 degrees to the radius and form a distance from the rotor, the minimum width of which is not greater than the diameter of the grains to be processed.
• the deflection elements are designed to be rotatable in relation to the radius, i.e. rotatable about a pivot point on the screen surface in the direction of this screen surface or in the opposite direction.
• the deflection elements are arranged radially and form a triangular prism, the lateral edges of which are directed towards the sieve.
• the deflection elements can be adjusted along the screen circumference.
• the possibility of displaceable execution of the deflection elements along the circumference of the sieve surface ensures uniform wear of the sieve during operation, since it already covers worn segments of the sieve.
• the next impact element of the rotor is impacted, so that after the product stream is fed into the grinding chamber, a pulsating character is added, with the supply and discharge to the impact organs being changed several times
• FIG. 1 schematic representation of the impact mill in longitudinal view
• Fig. 4 schematic representation of the mill in side view when using adjustable deflection elements
• 5 shows a schematic view of a sieve detail with an adjustable deflection element.
• the beater mill in FIG. 1 consists of a housing 1 with an inlet nozzle 2 and an outlet nozzle 3. Inside the housing 1 there is a rotor 4 with the beating elements 5.
• the rotor is surrounded by a sieve 6, on the surface 6a of which a plurality of deflection elements 7 , 9, preferably with a triangular cross section.
• the screen 6 is divided on its circumference into screen segments by the deflection elements 7, 9, which are directed inwards from the screen to the rotor and have a smooth working surface with an inclination in the direction of rotation of the rotor.
• the angle of inclination in relation to the radius is in the range from 20 to 80 degrees and the distance h between the ends of the impact members 5 and the deflection elements 7, 9 is not less than the grain diameter of the starting product).
• FIG 3 shows the screen 6, which is alternately divided into segments A and B with different perforations, the triangular prisms covering the segments of the same perforation.
• FIG. 4 shows an adjustable arrangement of the deflecting elements 7 and FIG. 5 shows the directions of rotation of the deflecting element 7 to and from the sieve 6 around a pivot point 80 arranged on the sieve surface 6a.
• the direction of rotation of the rotor 4 can take place both clockwise and counterclockwise.
• the deflection elements 7, 9 can be displaced in a ring 10 along the circumference of the sieve 6, cf. in particular Fig.2a arranged.
• the mill works as follows
• the starting product (uncrushed grain) is fed to the rotor 4 from two sides via the inlet connection 2 in FIG. 1 and, under the action of the centrifugal forces Z on the curved rotor path, reaches the sieve surface 6a or a sieving section S (see FIG. 2), which passes through two successive deflection elements 7 and 9 is limited. It should be noted that the starting product within the rotor 4 is subjected to partial comminution under the action of the striking elements 5. During its movement along the sieve 6 in FIG.
• the product comes onto the smooth, inclined surface of the deflection element 7, changes its direction of movement and arrives so under a single stroke of the striking element 5 of the rotor 4
• the product impacts the striking element 5, it is broken down into particles of different sizes which, under the action of the inertial forces which are given to them during the stroke, arrive at the next sieving section S which the deflecting element 7 in the
• Direction of rotation of the rotor 4 follows. During the movement along the sieve surface 6a under the influence of the centrifugal forces and the air flow generated by the rotor, the product is separated into large particles which have passed through the perforation of the sieve 6 are over the discharge nozzle 3 is removed from the impact mill as the starting product (finished product). The coarser particles and a certain number of small particles which have not had time to pass through the sieve reach the next deflecting element 7 which lies in the direction of movement of the product
• Each subsequent product requirement for comminution with the aid of the deflecting elements 7, 9 differs from the previous one in that the amount of product decreases continuously because the particles of the required size are continuously removed through the perforation of the sieve 6
• the process for crushing debris is based on the following principles
• the crushing principle of the impact mill is based on the crushing without direct interaction of the rotor 4 and sieve 5, which manifests itself in a reduction in energy consumption and in an increase in the life of the impact organs.
• the perforated surface of the chamber is spaced from the rotor by the distance necessary to prevent the rotor from striking the product as it passes
• the process has the best efficiency if the product is fed to the rotor at a certain angle. This angle to the radius must be in the range of 20 to 80 degrees.
• P1, P2 double arrows indicate the deflection of the material to and from the percussion organs

Landscapes

• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Crushing And Pulverization Processes (AREA)
• Disintegrating Or Milling (AREA)
• Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
• Crushing And Grinding (AREA)
• Control And Other Processes For Unpacking Of Materials (AREA)
• Mechanical Treatment Of Semiconductor (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=7822549

Family Applications (1)

Country Status (13)

Families Citing this family (4)

Family Cites Families (10)

• 1997
  • 1997-03-07 DE DE19709345A patent/DE19709345A1/de not_active Withdrawn
• 1998
  • 1998-02-26 RU RU99121196/12A patent/RU2224595C2/ru not_active IP Right Cessation
  • 1998-02-26 EP EP98902931A patent/EP0964748B1/fr not_active Expired - Lifetime
  • 1998-02-26 KR KR10-1999-7006598A patent/KR100501712B1/ko not_active IP Right Cessation
  • 1998-02-26 DK DK98902931T patent/DK0964748T3/da active
  • 1998-02-26 ES ES98902931T patent/ES2181161T3/es not_active Expired - Lifetime
  • 1998-02-26 TR TR1999/01748T patent/TR199901748T2/xx unknown
  • 1998-02-26 AU AU59801/98A patent/AU5980198A/en not_active Abandoned
  • 1998-02-26 WO PCT/CH1998/000080 patent/WO1998040163A1/fr active IP Right Grant
  • 1998-02-26 DE DE59805608T patent/DE59805608D1/de not_active Expired - Fee Related
  • 1998-02-26 AT AT98902931T patent/ATE224234T1/de not_active IP Right Cessation
  • 1998-02-26 UA UA99084769A patent/UA66782C2/xx unknown
  • 1998-02-26 CN CNB988021536A patent/CN1163304C/zh not_active Expired - Fee Related
• 1999
  • 1999-09-06 NO NO19994320A patent/NO994320L/no not_active Application Discontinuation

Non-Patent Citations (1)

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