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
  • B02C13/02—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft
  • B02C13/04—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters hinged to the rotor; Hammer mills
• • 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
  • B02C13/28—Shape or construction of beater elements
• • 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 hammer mill for feed processing, with a
• Mahlhunt forming mill housing which on a peripheral wall with two
• Sieve zones which have Sieboochungen with different sized hole diameters, and with a rotatably driven in the grinding chamber, equipped with hammers rotor.
• Hammer mills of this type are used in the processing of cereals or other agricultural products of plant origin, in order to prepare feed for the rearing of animals.
• the impact hammers arranged on the motor-driven rotor crush the cereal grains, plant parts and the like located therein in their circulation in the grinding chamber. until the shot produced thereby is smaller than the diameter of the sieve holes in the sieve zone used in each case.
• the object of the invention is, in particular for such applications, to provide a hammer mill with which, without conversion measures, it is possible to produce feed with a small grain size as well as with a coarser structure.
• Faces are provided, one of which in one direction of rotation and the others are effective in the opposite direction of rotation.
• the hammers each have two impact surfaces, which are preferably arranged symmetrically to each other and thus equally effective in both directions, so can be changed by simply switching the direction of rotation of the sieve of the produced feed crucial, without it being required by additional technical measures, cover individual areas of the screen, which, as explained, often requires a cleaning of the machine.
• the screening zones are preferably at least approximately symmetrical to each other in the
• Mill housing arranged and adjacent to the lower bottom portion of the grinding chamber preferably at their lowest point together. It is also possible to provide a partition on the outlet side between the two screening zones or to assign separate collection containers to the two screening zones if mixing of the fine fraction emerging through the fine screen with the coarser result in the coarse screening is to be kept to a minimum.
• the grinding chamber may for example be cylindrical, but it may also have a substantially oval cross-section, for example, similar to the combustion chamber look at a rotary engine.
• the rotor with eccentricity to the grinding chamber is arranged in this, that the average distance of its axis of rotation of the screening zone with the Sieblochungen smaller diameter is less than from the screening zone with the Sieblochungen larger diameter. This achieves a smaller distance of the radially outer flapping surfaces of the impact hammers of the finer sieve, so that the material to be ground in this screening zone with the Sieblochungen smaller hole diameter is very quickly crushed when the rotor rotates in a direction of rotation, in which the fine sieve in Rotation direction after the material inlet is reached first.
• the rotor may be provided with evenly distributed over its circumference arranged pivot axes on which the hammers are pivotally mounted.
• the arrangement is preferably made such that a plurality of hammers are distributed over the width of the housing at each pivot axis.
• the striking surfaces are expediently formed on the front and rear longitudinal sides of the hammers in the direction of rotation of the rotor at their radially outer end regions (hammerheads). They are preferably formed by arranged on the hammers hard metal elements, which have a high strength and are subject to little wear. In particular, if the material to be ground is very abrasive, it is advantageous if the striking surfaces are formed by exchangeable attached to the hammers wear pieces, because then the hammers must not be completely replaced when their striking surfaces have reached the wear limit, but it is sufficient just replace the wear pieces.
• the rotor can be provided with circumferentially before and / or behind the pivot axes, the pivoting movement of the hammers limiting attacks, whereby the effectiveness of the machine is further increased.
• Screening zones may be formed by screen inserts or sheets interchangeably arranged in the mill housing, which not only can be replaced when worn, but also allow replacement with another screen insert with larger or smaller holes to alter the degree of grinding.
• the screen zones each extend over a peripheral region of about 60 ° to 140 ° of the peripheral wall of the grinding chamber.
• the mill housing is preferably constructed substantially symmetrical. For this purpose, it can be provided with an upper inlet for regrind, which opens symmetrically to the sieve zones below into the grinding chamber.
• FIG. 1 shows a hammer mill according to the invention in a side view looking into the grinding chamber
• FIG. 2 shows the subject matter of Fig. 1 in a transverse view and partly in section.
• the hammer mill 10 intended for feed preparation has a mill housing 11 in which a grinding chamber 12 is formed.
• the grinding chamber 12 has a substantially cylindrical shape and has an inlet 13 arranged at the top, which widens like a funnel with two guide plates 14 into the actual grinding chamber of the grinding chamber.
• Adjacent to the guide plates 14, the mill housing 11 or the grinding chamber 12 formed by this has a peripheral wall 15, which extends over an angle of about 270 ° in total.
• the peripheral wall 15 is essentially formed by two screen plates 16, 17, which adjoin one another at the lowest point 18 of the grinding chamber. In this case, the arrangement is such that the arranged in Fig.
• a rotor 20 equipped with impact hammers 19 is rotatably arranged in the grinding chamber 12, a rotor 20 equipped with impact hammers 19 is rotatably arranged.
• the rotor is mounted directly on the shaft 21 of a drive motor 22 flanged to the mill housing 11, wherein the drive motor is a variable speed motor whose output shaft on which the rotor 20 is seated can rotate in both directions of variable speed.
• the rotor 20 in the mill housing can rotate either clockwise or counterclockwise.
• the rotor 20 is provided at its front and its rear end with annular support discs 23 which carry four evenly arranged on a pitch circle 24 hammer axes 25, on each of which six flat impact hammers 19 are pivotally mounted.
• annular support discs 23 which carry four evenly arranged on a pitch circle 24 hammer axes 25, on each of which six flat impact hammers 19 are pivotally mounted.
• For an additional support of the hammer axes provides a third, central support disk, wherein the arrangement is such that in each case between two support points formed by the support points three impact hammers 19 are arranged on a hammer axis. So that the distance between the impact hammers remains constant from each other, spacer bushes 26 are arranged between them and the support disks.
• each two stop elements 27 are provided, which are formed by running between the support plates 23 bolts that additionally stabilize the rotor and limit the pivoting movement of the impact hammers 19.
• Impact surfaces 28 are provided, which are formed by the hammers in the circumferential direction of the rotor front and rear carbide elements 29, which are exchangeably attached as wear pieces on the hammers 19.
• Faces are in each case the lying in the direction of rotation of the rotor front of the hammers impact surfaces effective, i. upon rotation in a clockwise direction according to FIG. 1, the striking surfaces 28a, in a counterclockwise rotation, the striking surfaces 28b.
• the rotor is arranged in the mill housing 11 with an eccentricity e to the grinding chamber 12 in this, that the (average) distance of its axis of rotation 30 smaller of the screen zone II formed by the screen plate 17 with holes smaller hole diameter smaller is as of the screen zone I, which is formed by the screen plate 16 with the larger Siebiochungen.
• Hammer mill can produce cattle feed, such as cereals, with two different screening or scrap grades, without the need to rebuild the mill, for example, by replacing the screen plates.
• the impact-driven rotor is rotated in a first direction of rotation in the housing, where the impact hammers (starting from the upper inlet) pass first the screen zone I (clockwise in FIG. 1), this is supplied via the inlet Ground stock of the hammers roughly cut and emerges from the comparatively large holes in the screen plate 16, from where it falls down through an opening in the machine base 31.
• this direction of rotation of the rotor also means that a part of the ground material to be processed in the screening zone II is further crushed and there from the smaller sieve holes of the
• Mahlhunt not cylindrical, but has a substantially oval cross-section.
• the width of the grinding chamber in the axial direction of the rotor and the number of impact hammers received on the hammer axes can vary depending on the application and the size of the machine.
• the rotational speed is preferably infinitely adjustable, so that the peripheral speed with which the impact hammers act on the material to be ground, can be varied.
• the hammer mill may be formed as a stationary mill, but it may also be a mobile unit, which is transported by means of a transport vehicle to the respective place of need.

Priority Applications (2)

Applications Claiming Priority (2)

Publications (2)

Family

ID=43500288

Family Applications (1)

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Cited By (1)

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• 2009
  • 2009-09-16 DE DE200920011011 patent/DE202009011011U1/de not_active Expired - Lifetime
• 2010
  • 2010-09-07 WO PCT/IB2010/054032 patent/WO2011033416A2/de active Application Filing
  • 2010-09-07 PL PL398280A patent/PL221771B1/pl unknown
  • 2010-09-07 EA EA201270420A patent/EA020274B1/ru not_active IP Right Cessation
  • 2010-09-07 DE DE112010003660T patent/DE112010003660A5/de not_active Ceased

Patent Citations (1)

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