US3929296A - Striking tool - Google Patents

Striking tool Download PDF

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Publication number
US3929296A
US3929296A US458311A US45831174A US3929296A US 3929296 A US3929296 A US 3929296A US 458311 A US458311 A US 458311A US 45831174 A US45831174 A US 45831174A US 3929296 A US3929296 A US 3929296A
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United States
Prior art keywords
striking
tool
wear
layer
edge
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US458311A
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English (en)
Inventor
Hans Stoeber
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Individual
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Individual
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Publication of US3929296A publication Critical patent/US3929296A/en
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    • 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
    • B02C13/2804—Shape or construction of beater elements the beater elements being rigidly connected to the rotor

Definitions

  • ABSTRACT [30] Foreign Application Priority Data Apr. 7 1973 Germany............................ 2317692 A striking tool for crushing stonelike material, the tool having a double layer, one layer forming the working side and being prone to wear and the other layer forming the rear side being of a material having resistance to bending.
  • This invention relates generally to striking tools, and more particularly, to an impact-hammer crusher arranged on a rotor positioned on horizontally or vertically disposed bearings for crushing stonelike materials having a working side limited in its upper area by a striking edge.
  • Striking wear occurs predominantly, directly at the front edge of the breaking tool, the striking edge. Pure striking wear exists however only in the case of new tools, and is, thus, limited in time. In a new striking tool, the striking edge is situated on the largest radius with regard to the rotor axis, i.e., the striking edge alone determines the striking circle diameter. Thus, a new striking tool shows only striking wear. Such striking wear is, however, limited to a short period, as with progressing wear of the striking edge, friction wear occurs on the outside of the tool in addition to striking wear.
  • the quality of the breaking material is optimal, since the energy residing in the rotor, is fully available for shearing an individual stone, and for hurling away the part of a stone which has penetrated into the striking circle.
  • Striking wear has the effect of rounding the striking edge, whereby additionally, friction wear occurs in the zone lying behind the striking edge, the so-called outer surface.
  • This friction wear uses up in an increasing manner the outer surface and deforms the tool so as to rise steeply toward the rear, opposite the direction of rotation.
  • This deformation of the tool so as to rise steeply toward the rear which results in the creation of an oblique outer surface, prevents a predominant portion of the stones falling through a chute from reaching the actual striking edge as a result of the greater peripheral velocity of the striking tool vis a vis the velocity of the falling stones.
  • the present invention has the object of constructing a striking tool of the type previously mentioned, in such a fashion that the reduction in quality of the breaking material with increasing wearing out of the striking tool is largely avoided.
  • the striking tool is designed to have a double layer, in which one layer is constructed as a working side, comprising a material prone to wear and the other layer as a rear side ofa material having resistance to bending.
  • a working side comprising a material prone to wear
  • the other layer as a rear side of a material having resistance to bending.
  • the materials of both layers can be formed as a composite material.
  • the striking edge with continuous wearing out of the striking tool, can exhibit a somewhat equal distance from the line of separation, between the two layers, whereby, in a simple manner, the preservation of a sharp striking edge is assured.
  • FIG. 1 shows a lateral view of a striking tool according to the invention, with rotor in cross section;
  • FIG. 2 shows another embodiment of a striking tool with rotor.
  • the striking tool represented in Flg. 1 is arranged in a rotor 3, wherein the rotor 3 is moved in the direction of arrow I.
  • the striking tool 1 has a working side 4, and a rear side 12.
  • the working side 4 is bounded at the upper zone by a striking edge 2.
  • the striking tool 1 comprises the two layers 8 and 9, in which the layer 8 constitutes the working side 4, while the layer 9 represents the rear side 12.
  • the layer 8 of the working side 4 comprises a material highly capable of resistance to wear, but of low resistance to bending, while the layer 9 comprises a material which has a high resistance to bending, but low resistance to wear.
  • layer 8 could be composed of chilled cast iron such as a cast steel of 3% C and l5-20% Cr.
  • layer 9 could be composed of tough weldable steel or cast steel.
  • the two layers could be secured together as a lamination, by casting for example. Other compositions or means of securement of the two layers are possible.
  • the front layer 8 comprising wear-resistant material, which constitutes the working side 4, is embedded in the layer 9 of the rear side 12.
  • the contour of the working side exhibits no deviation as compared with the contour of conventional striking tools.
  • the contour of the border surface or interface 10 between the wear resistant but low bending resistant material of the layer 8, and the bending resistant but low wear resistant material of the layer 9 is chosen such 3 that with increasing wearing out W W of the wear resistant layer, a comparatively sharp edge 11 remains, as the striking tool is worn back from the striking circle S to the striking circle S.
  • the layer 9 is, on the other hand, so worn out through friction wear, that its outer surface W2, W3, etc. does not project, or only slightly projects, over the circle described through the striking edge 11.
  • the distance of the striking edge 11 from the interface thus remains generally constant as measured along the Striking circle.
  • the rear side 12 of the striking tool 1 is contoured such that the layer 9 exhibits consistent rigidity with respect to the striking and bending load, but presents a minimum of an oblique outward friction surface so as to minimize frictional drag between the tool and stones to be crushed.
  • the layer 9 completely surrounds the front layer 8 of the working side 4.
  • FIG. 2 another embodiment 13 of a striking tool is represented, which is constructed as a striking hammer pivotally suspended in the rotor 3, through a hinge 20.
  • This striking tool or the striking hammer 13 moves together with the rotor in the direction of arrow I.
  • the striking tool is likewise made of composite material having a front layer 14, being wear resistant, which forms the working side 4 with the striking edge 2.
  • This wear resistant layer 14 is embedded in a supporting layer 15, of low wear resistance, but of high resistance to bending, which layer constitutes the rear side 12 of the striking tool. Again, through this combination is assured that also with increasing wearing out of the working side, a sharp striking edge is constantly present.
  • Both striking tools represented in the embodiments explained in the foregoing are constructed in such a fashion that the working side 4 and the rear side 12, define a body having a small striking surface, and equal resistance to bending at every point of the cross section, and at every stage of wear. Through this, a fingerlike cross section ensues, which assures that a striking tool functioning efficiently is present even with increasing wear.
  • a striking tool for an impact and hammer crusher the tool adapted to be mounted on a rotor supported in a bearing and operable to rotate the tool at high velocity into engagement with stones along a striking circle for crushing same, the tool comprising an impact head formed of a composite material comprising at least a pair of layers of material having an intimately bonded interface, one layer providing a working side of wearresistant material having a striking edge, the other layer formed of a material resistant to bending and having a low wear resistance, and wherein the upper surface of said other layer substantially recedes relative to the striking edge of the working side at an acute angle relative to a plane tangential to the striking edge and generally normal to the striking circle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
US458311A 1973-04-07 1974-04-05 Striking tool Expired - Lifetime US3929296A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2317692A DE2317692B2 (de) 1973-04-07 1973-04-07 Schlagwerkzeug aus Verbundmetall fur Prall- und Hammerbrecher

Publications (1)

Publication Number Publication Date
US3929296A true US3929296A (en) 1975-12-30

Family

ID=5877432

Family Applications (1)

Application Number Title Priority Date Filing Date
US458311A Expired - Lifetime US3929296A (en) 1973-04-07 1974-04-05 Striking tool

Country Status (7)

Country Link
US (1) US3929296A (it)
AT (1) ATA266474A (it)
CH (1) CH571892A5 (it)
DE (1) DE2317692B2 (it)
FR (1) FR2224210B1 (it)
GB (1) GB1456734A (it)
IT (1) IT1004454B (it)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4129262A (en) * 1977-08-12 1978-12-12 E & I Corporation Pulverizer hammer for comminutating apparatus
US4714207A (en) * 1985-07-17 1987-12-22 Fried. Krupp Gesellschaft Mit Beschrankter Haftung Impact bar for a comminuting rotor
US4717083A (en) * 1984-01-27 1988-01-05 Quast Roger H Hammer assembly for a rotary material crusher
US4729516A (en) * 1986-04-14 1988-03-08 Williams Patent Crusher And Pulverizer Company Fluff mill
US4969605A (en) * 1989-04-20 1990-11-13 Eclectic Machine Systems, Inc. Disposable, double-edged knives in granulator machines
US5967436A (en) * 1998-06-05 1999-10-19 Balvanz; Loran Russell Production plus hammer with protective pocket
US6131838A (en) * 1999-06-04 2000-10-17 U.S. Manufacturing Inc. Saddle-back hammer tip
WO2002040167A1 (de) * 2000-11-20 2002-05-23 Bhs-Sonthofen Maschinen- Und Anlagenbau Gmbh Schleuderkanten-verschleisseinheit
US6419173B2 (en) 1999-07-27 2002-07-16 Us Manufacturing, Inc. Production plus hammer with protective pocket
US20040238666A1 (en) * 2003-05-29 2004-12-02 Gray Paul R. Hammer with protective pocket
US9321117B2 (en) 2014-03-18 2016-04-26 Vermeer Manufacturing Company Automatic system for abrasive hardfacing
US20190015838A1 (en) * 2017-06-16 2019-01-17 Keestrack N.V. Impact bar
US11446674B2 (en) * 2017-11-23 2022-09-20 Keestrack N.V. Blow bar

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3272559D1 (en) * 1982-06-04 1986-09-18 Rudolf P Fritsch Rotating blade assembly, especially for granulating strands of plastics material
DE3590716T1 (it) * 1985-01-17 1987-03-12
DE3545708C2 (de) * 1985-12-21 1994-01-20 Werner Doppstadt Umlaufender Schlegel zum Zerkleinern von Materialien
US4871119A (en) * 1987-03-06 1989-10-03 Kabushiki Kaisha Kobe Seiko Sho Impact crushing machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1630021A (en) * 1924-08-01 1927-05-24 George P Lucas Centrifugal hammer
US3608841A (en) * 1968-03-14 1971-09-28 Franz Wageneder Rotary impact crusher

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1630021A (en) * 1924-08-01 1927-05-24 George P Lucas Centrifugal hammer
US3608841A (en) * 1968-03-14 1971-09-28 Franz Wageneder Rotary impact crusher

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4129262A (en) * 1977-08-12 1978-12-12 E & I Corporation Pulverizer hammer for comminutating apparatus
US4717083A (en) * 1984-01-27 1988-01-05 Quast Roger H Hammer assembly for a rotary material crusher
US4714207A (en) * 1985-07-17 1987-12-22 Fried. Krupp Gesellschaft Mit Beschrankter Haftung Impact bar for a comminuting rotor
US4729516A (en) * 1986-04-14 1988-03-08 Williams Patent Crusher And Pulverizer Company Fluff mill
US4969605A (en) * 1989-04-20 1990-11-13 Eclectic Machine Systems, Inc. Disposable, double-edged knives in granulator machines
US5967436A (en) * 1998-06-05 1999-10-19 Balvanz; Loran Russell Production plus hammer with protective pocket
US6131838A (en) * 1999-06-04 2000-10-17 U.S. Manufacturing Inc. Saddle-back hammer tip
US6419173B2 (en) 1999-07-27 2002-07-16 Us Manufacturing, Inc. Production plus hammer with protective pocket
WO2002040167A1 (de) * 2000-11-20 2002-05-23 Bhs-Sonthofen Maschinen- Und Anlagenbau Gmbh Schleuderkanten-verschleisseinheit
US20040238666A1 (en) * 2003-05-29 2004-12-02 Gray Paul R. Hammer with protective pocket
US9321117B2 (en) 2014-03-18 2016-04-26 Vermeer Manufacturing Company Automatic system for abrasive hardfacing
US20190015838A1 (en) * 2017-06-16 2019-01-17 Keestrack N.V. Impact bar
US10792664B2 (en) * 2017-06-16 2020-10-06 Keestrack N.V. Impact bar
US11446674B2 (en) * 2017-11-23 2022-09-20 Keestrack N.V. Blow bar

Also Published As

Publication number Publication date
ATA266474A (de) 1975-11-15
IT1004454B (it) 1976-07-10
FR2224210A1 (it) 1974-10-31
FR2224210B1 (it) 1979-01-12
CH571892A5 (it) 1976-01-30
GB1456734A (en) 1976-11-24
DE2317692A1 (de) 1974-10-10
DE2317692B2 (de) 1978-07-27

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