CA1084021A - Impact-crusher rotors and beater bar therefor - Google Patents
Impact-crusher rotors and beater bar thereforInfo
- Publication number
- CA1084021A CA1084021A CA271,622A CA271622A CA1084021A CA 1084021 A CA1084021 A CA 1084021A CA 271622 A CA271622 A CA 271622A CA 1084021 A CA1084021 A CA 1084021A
- Authority
- CA
- Canada
- Prior art keywords
- beater bar
- rotor
- beater
- bar
- rearwardly
- Prior art date
- 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
Links
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
- B02C13/28—Shape or construction of beater elements
- B02C13/2804—Shape or construction of beater elements the beater elements being rigidly connected to the rotor
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Pulverization Processes (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A beater bar for impact-crusher rotors for the purposes of reversibility is of elongated, mirror-symmetrical cross section of substantially constant width. On its rear side, as seen in the direction of rotation of the rotor, the bar sufaces by means of which it bears rearwardly and radially from the interior against retaining parts secured to the said rotor. On its front side the bar has backing surfaces for wedges which keep the beater bar in engagement with the retaining parts.
The bar cross section is of a rearwardly buckled shape, the backing surfaces for the wedges being located in the middle of the front side and at right angles to the plane of symmetry (b) of two rearwardly angled sections of beater bar.
A beater bar for impact-crusher rotors for the purposes of reversibility is of elongated, mirror-symmetrical cross section of substantially constant width. On its rear side, as seen in the direction of rotation of the rotor, the bar sufaces by means of which it bears rearwardly and radially from the interior against retaining parts secured to the said rotor. On its front side the bar has backing surfaces for wedges which keep the beater bar in engagement with the retaining parts.
The bar cross section is of a rearwardly buckled shape, the backing surfaces for the wedges being located in the middle of the front side and at right angles to the plane of symmetry (b) of two rearwardly angled sections of beater bar.
Description
iO840Zl The invention relates to a beater bar for impact--crusher rotors, the beater bar having on its rear side as seen in the direction of rotation of the rotor surfaces by means of which it bears rearwardly and radially from the interior against retaining parts fixed to the said rotor; and having, on its front side, backing surfaces Eor wedges which keep the said beater bar in engagement with the said retaining parts.
Reversible but not rotatable beater bars of this kind are known in many designs They are particularly suitable for impact~crusher rotors con-sisting of a plurality of discs secured to one axis and having peripheral recesses into which the beater bars are inserted since, in rotors of this kind, the beater bars are also exposed to wear between the discs on the inner halves of their front sides, so that these surfaces cannot be used as backing surfaces on the rear sides. Upon reversing the beaters, i.e, pivoting them about a central transverse axis, the rear side remains at the back and the front side at the front, but the inner half is now outermost and vice-versa.
A beater bar of this kind is disclosed, for example, in German Disclosure Text 2 148 752, Like many other known beater bars, it has an elon-gated cross section of constant width and is straight. Since to achieve a satisfactory crushing action, the outer part of the front surface of the beater bar which acts as the beating surface is preferably radial, or slopes only slightly forwards, this design of beater bar produces a substantially radial positioning of the beater bar as a whole in the recesses in the rotor discs, The result of this is that, because of the wedges and pressure de-vices arranged therefor, as seen in the direction of rotation of the rotor, in front of the beater bars, these recesses must be bulged forwardly. This produces a weakening of the rotor jaws gripping the beater bar from the front, the front iaws being already weaker in that they are set back radially in relation to the rear rotor jaws, Since in beater bars of this kind, the backing surfaces for the wedges also run radially, the complementary surfaces in the edge recesses must also run obliquely inwards and forwards. This produces undercuts which are difficult to machine, Furthermore, in order to achieve a beater bar of 1084(~Zl simple shape, the retaining parts secured to the rotor must be provided with longitudinal ribs or grooves which are also difficult to machine. Finally, in these known beater bars, the backing surfaces for the wedges are outside the plane of symmetry of the beater bar, The result of this is that, after re-versal of the beater bar, the wedges must bear against surfaces which have already been subjected to at least a certain amount of wear, and are therefore no longer accurately flat, It is the purpose of the invention to provide a beater bar of simple cross section, which can be clamped securely in a rotor, which itself also has a small number of easily machinable surfaces, and which is moreover resistant to bending.
According to the invention, there is provided a beater bar for impact-crusher rotors, said bar being of reversible, elongated, mirror-symmetrical cross section and of substantially constant width, and on its rear side, as seen in the direction of rotation of the rotor, having surfaces by means of which it bears rearwardly and radially from the in~erior against retaining parts secured to the said rotor, and having, on its front side backing surfaces for wedges which keep the said beater bar in engagement with the said retain-ing parts, characterized in that the cross section has a plane of symmetry on opposite sides of which are rearwardly-angled sections and in that the back-ing surfaces for the wedges are located in the middle of the front side and at right angles to the plane of symmetry of the beater bar, The angling in the cross section provides a beater bar which is no more difficult to cast than a bar having a continuous rectangular cross section, whereas the profile of the rear side is suitable, as is, for backing-up, and engaging behind, the rotor retaining parts. Furthermore, the angling in 10840Zl the cross section improves the resistance of the beater bar to bending, and this is an advantage in the case of bars made from hard manganese steel, since the surface of the bar in contact with the material being crushed tends to stretch because of the material being initially soft, and this produces a bending moment. On the front surface, it is easy to provide backing surfaces for the wedges which, even if they are not in the form of cast reinforcements, can easily be machined. During operation, these backing surfaces are com-pletely covered by the wedges, they are not subjected to wear, and they may therefore be used to back up the wedges even after the beater bar has been reversed.
Since the backing surfaces slope in relation to the two outer sur-/ p/ane -L face parts of the front side, they are also at an angle to the radii in the case of a beater bar incorporated with radial beating surfaces. This makes it possible to select the wedges in such a manner that the surfaces of the rotor-disc recesses against which the said wedges bear run parallel to the backing surfaces of the retaining partsO This means that both surfaces can be mach-ined at a single rotor setting.
Finally, the aforesaid slope of the backing surfaces for the wedges produces a somewhat outwardly-directed direction of pressure which, in co-operation with the backing surfaces for the retaining parts (which, for thepurpose of satisfactorily absorbing the shocks applied to the beater bar during beating, should lie radially farther out) ensures very satisfactory clamping of the beater bar.
Particularly good clamping of the beater bar occurs if the two sur-faces of the rear side of the bar, which run at an obtuse angle towards each other, extend for a certain distance beyond the plane of symmetry of the beater bar and then run angularly backwards, thus producing two longitudinal grooves.
This makes it possible to provide the rotor retaining parts with an inner surface running approximately peripherally, against which the beater bar bears iO84(~Zl radially from the interior. If casting inaccuracies make it necessary, the cast longitudinal grooves are very easily processed by grinding, especially since the surfaces to be ground are not large. Since the longitudinal grooves are located on the rear side of the beater bar to which the pressure is ap-plied, there is no objection to such grooves, especially since this side is in full contact with its backing surfaces. The groove angle is preferably 9oo .
The inner regions, i.e. those adjacent the plane of symmetry,of the surfaces of the rear side running towards each other at an obtuse angle, are preferably slightly raised in relation to the outer regions and are machined.
Although United States Patent 2,747,803 discloses a beater bar in which the rear surface has a basic rearward buckle, the front side is basic-ally straight. As a result of this, the beater bar has a very wide outer surface, leading to heavy frictional wear. This also complicates the cross-sectional shape. In this connection, the backing surface on the front side of the beater bar is depressed, since it is impossible to machine such a sur-face without special steps, as can be done in the case of the object of the application. Instead, an intermediate piece must even be arranged between the beater bar and the wedge, so that the wedge may move freely in relation to the beater bar. The same applies to the beater bar according to German Patent 1~143,380, in which the front surface is also buckled forwardly.
Another advantage of the present invention over the above-discussed publications results from the more advantageous location of the center of gravity of the beater bar of the present invention. Because of the ~earwardly bent configuration of the beater bar of the present invention, the center of gravity is located in the vicinity of the rear surfaces. As a result thereof, due to the proportion of the moment arms, the wedges engaging the front backing surface are virtually free of radial forces resulting from centrifugal forces acting on the beater bar during the operation of the rotor.
~ - 4 -10840Zl On the other hand, when the center of gravity is located further to the front as is the case of United States Patent 2,747,803 on German Patent 1,143,380, the wedges are subjected to much higner forces. The mounted position of the beater bar of the present invention is also more advantageous inasmuch as the radially inner section of the beater bar, that is, the rearward backing surface thereof, engages more behind the backing retaining parts than is the case in the beater bars of these references, even though the beating surfaces of the present invention and of these publications may extend in the same direction.
The invention also provides a rotor for impact crushers having beater bars which, are of reversible elongated, mirror-symmetrical cross section and of substantially constant width, each beater bar having on its rear side as seen in the direction of rotation of said rotor, bearing sur-faces which engage rearwardly and radially from the interior, against retain-ing parts secured to said rotor, and on its front side, backing surfaces for wedges which bear against said rotor and keep said beater bar in engagement with the said retaining parts, characterized in that each beater bar has a - 4a -108402~
cross-section having two rearwardly angled sections arranged on opposite sides of a plane of symmetry said backing surface, on the front side of each beater bar extending at right angles to the plane of symmetry thereof. Each bar is clamped with a generally radially directed outer part, in such a manner that the inner part is bent backwards in relation to the peripheral direction of the rotor, since this makes it possible to shape in a satisfactory manner the recesses provided at the periphery, the contours of which fit as closely as possible around the parts used to clamp the beater bars and the beater bars themselves, in view of the configuration of the jaws between which the said beater bars are clamped. This is particularly important in the case of ro-tors consisting of a plurality of rotor discs secured to a common axis.
Since the rotor surfaces between which the beater bars are clamped require machining, it is desirable for the surfaces of the retaining parts against which the rear of the beater bars bear, and the surfaces against which the wedge surfaces bear, are parallel.
Figures 1 and 2 of the drawing illustrate diagrammatically cross-R ~;e~S
sectional woavo of two embodiments of the beater bar according to the invention incorporated into an impact-crusher rotor.
Beater bar 1 is incorporated into a rotor consisting of a plurality of rotor discs 2 secured on a common axis (not shown). The discs have a plurality of and, e.g. four, peripheral recesses 3, to the rear edges 4 of which, as seen in the direction of rotation (arrow "a"), a retaining part in the form of a supporting beam 5 is secured by welding. The front face of the supporting beam, against which the rear of the beater bar bears, consists of an outer part 6 extending approximately radially, and a part 7 at an angle thereto and pointing inwardly to a greater or lesser degree.
Provided at the front edge 8 of recess 3 is a protective cap 9 en-gaging with the edge and provided with a projecting edge 10 engaging in a corresponding groove 11 in edge 8. The back of the cap carries a guide groove 1084~Zl 12 in which runs a wedge 13 which can be forced in a radially outward direc~
tion by means of a hydraulic ram 14 located at the bottom of recess 3.
Beater bar 1 has an angled, mirror-symmetrical cross section, the plane of symmetry "b" of the bar passing through the axis shown in dotted linest The rear face of the beater bar has two outer surface portions 15 and two inner surface portions 16 adjacent the plane of symmetry, the latter being slightly raised in relation to the outer surface portions 15 and being machined, The front face of the beater bar has two outer surface portions 17 serving as beating surfaces, and a central surface portion 18 which lies at right angles to plane of symmetry "b", and which serves as a backing surface for wedge 13 and is also machined, Surface portion 18 is required only where there is a wedge, i,e, in the vicinity of each rotor disc 2, Between the discs, the outer surface portions 17 may converge towards the plane of symmetry, as shown in dotted lines, Thus the wedge 13 can serve to prevent the beater bar from being displaced longitudinally, In the case of the beater bar illustrated in Figure 2, inner surface portions 16 are extended beyond plane of symmetry "b", This produces two grooves l9 which are defined outwardly by surfaces 20 by means of which the beater bar bears radially, from the interior, against corresponding backing surfaces 6, 7 of supporting beam 5, This design of beater bar permits a simpler configuration of the supporting beam and improved retention of the beater bar in the rotor. Since the grooves are located on the side of the beater bar to which pressure is applied, the durability of the beater bar is not impaired thereby, However~ contrary to the graphic representation, outer surface portions 17 may run over the width of the beater bar only as far as surface portions 18 and, because of the improved machinability of the clamping surfaces, surface portions 18 may be slightly raised in the width of the wedge,
Reversible but not rotatable beater bars of this kind are known in many designs They are particularly suitable for impact~crusher rotors con-sisting of a plurality of discs secured to one axis and having peripheral recesses into which the beater bars are inserted since, in rotors of this kind, the beater bars are also exposed to wear between the discs on the inner halves of their front sides, so that these surfaces cannot be used as backing surfaces on the rear sides. Upon reversing the beaters, i.e, pivoting them about a central transverse axis, the rear side remains at the back and the front side at the front, but the inner half is now outermost and vice-versa.
A beater bar of this kind is disclosed, for example, in German Disclosure Text 2 148 752, Like many other known beater bars, it has an elon-gated cross section of constant width and is straight. Since to achieve a satisfactory crushing action, the outer part of the front surface of the beater bar which acts as the beating surface is preferably radial, or slopes only slightly forwards, this design of beater bar produces a substantially radial positioning of the beater bar as a whole in the recesses in the rotor discs, The result of this is that, because of the wedges and pressure de-vices arranged therefor, as seen in the direction of rotation of the rotor, in front of the beater bars, these recesses must be bulged forwardly. This produces a weakening of the rotor jaws gripping the beater bar from the front, the front iaws being already weaker in that they are set back radially in relation to the rear rotor jaws, Since in beater bars of this kind, the backing surfaces for the wedges also run radially, the complementary surfaces in the edge recesses must also run obliquely inwards and forwards. This produces undercuts which are difficult to machine, Furthermore, in order to achieve a beater bar of 1084(~Zl simple shape, the retaining parts secured to the rotor must be provided with longitudinal ribs or grooves which are also difficult to machine. Finally, in these known beater bars, the backing surfaces for the wedges are outside the plane of symmetry of the beater bar, The result of this is that, after re-versal of the beater bar, the wedges must bear against surfaces which have already been subjected to at least a certain amount of wear, and are therefore no longer accurately flat, It is the purpose of the invention to provide a beater bar of simple cross section, which can be clamped securely in a rotor, which itself also has a small number of easily machinable surfaces, and which is moreover resistant to bending.
According to the invention, there is provided a beater bar for impact-crusher rotors, said bar being of reversible, elongated, mirror-symmetrical cross section and of substantially constant width, and on its rear side, as seen in the direction of rotation of the rotor, having surfaces by means of which it bears rearwardly and radially from the in~erior against retaining parts secured to the said rotor, and having, on its front side backing surfaces for wedges which keep the said beater bar in engagement with the said retain-ing parts, characterized in that the cross section has a plane of symmetry on opposite sides of which are rearwardly-angled sections and in that the back-ing surfaces for the wedges are located in the middle of the front side and at right angles to the plane of symmetry of the beater bar, The angling in the cross section provides a beater bar which is no more difficult to cast than a bar having a continuous rectangular cross section, whereas the profile of the rear side is suitable, as is, for backing-up, and engaging behind, the rotor retaining parts. Furthermore, the angling in 10840Zl the cross section improves the resistance of the beater bar to bending, and this is an advantage in the case of bars made from hard manganese steel, since the surface of the bar in contact with the material being crushed tends to stretch because of the material being initially soft, and this produces a bending moment. On the front surface, it is easy to provide backing surfaces for the wedges which, even if they are not in the form of cast reinforcements, can easily be machined. During operation, these backing surfaces are com-pletely covered by the wedges, they are not subjected to wear, and they may therefore be used to back up the wedges even after the beater bar has been reversed.
Since the backing surfaces slope in relation to the two outer sur-/ p/ane -L face parts of the front side, they are also at an angle to the radii in the case of a beater bar incorporated with radial beating surfaces. This makes it possible to select the wedges in such a manner that the surfaces of the rotor-disc recesses against which the said wedges bear run parallel to the backing surfaces of the retaining partsO This means that both surfaces can be mach-ined at a single rotor setting.
Finally, the aforesaid slope of the backing surfaces for the wedges produces a somewhat outwardly-directed direction of pressure which, in co-operation with the backing surfaces for the retaining parts (which, for thepurpose of satisfactorily absorbing the shocks applied to the beater bar during beating, should lie radially farther out) ensures very satisfactory clamping of the beater bar.
Particularly good clamping of the beater bar occurs if the two sur-faces of the rear side of the bar, which run at an obtuse angle towards each other, extend for a certain distance beyond the plane of symmetry of the beater bar and then run angularly backwards, thus producing two longitudinal grooves.
This makes it possible to provide the rotor retaining parts with an inner surface running approximately peripherally, against which the beater bar bears iO84(~Zl radially from the interior. If casting inaccuracies make it necessary, the cast longitudinal grooves are very easily processed by grinding, especially since the surfaces to be ground are not large. Since the longitudinal grooves are located on the rear side of the beater bar to which the pressure is ap-plied, there is no objection to such grooves, especially since this side is in full contact with its backing surfaces. The groove angle is preferably 9oo .
The inner regions, i.e. those adjacent the plane of symmetry,of the surfaces of the rear side running towards each other at an obtuse angle, are preferably slightly raised in relation to the outer regions and are machined.
Although United States Patent 2,747,803 discloses a beater bar in which the rear surface has a basic rearward buckle, the front side is basic-ally straight. As a result of this, the beater bar has a very wide outer surface, leading to heavy frictional wear. This also complicates the cross-sectional shape. In this connection, the backing surface on the front side of the beater bar is depressed, since it is impossible to machine such a sur-face without special steps, as can be done in the case of the object of the application. Instead, an intermediate piece must even be arranged between the beater bar and the wedge, so that the wedge may move freely in relation to the beater bar. The same applies to the beater bar according to German Patent 1~143,380, in which the front surface is also buckled forwardly.
Another advantage of the present invention over the above-discussed publications results from the more advantageous location of the center of gravity of the beater bar of the present invention. Because of the ~earwardly bent configuration of the beater bar of the present invention, the center of gravity is located in the vicinity of the rear surfaces. As a result thereof, due to the proportion of the moment arms, the wedges engaging the front backing surface are virtually free of radial forces resulting from centrifugal forces acting on the beater bar during the operation of the rotor.
~ - 4 -10840Zl On the other hand, when the center of gravity is located further to the front as is the case of United States Patent 2,747,803 on German Patent 1,143,380, the wedges are subjected to much higner forces. The mounted position of the beater bar of the present invention is also more advantageous inasmuch as the radially inner section of the beater bar, that is, the rearward backing surface thereof, engages more behind the backing retaining parts than is the case in the beater bars of these references, even though the beating surfaces of the present invention and of these publications may extend in the same direction.
The invention also provides a rotor for impact crushers having beater bars which, are of reversible elongated, mirror-symmetrical cross section and of substantially constant width, each beater bar having on its rear side as seen in the direction of rotation of said rotor, bearing sur-faces which engage rearwardly and radially from the interior, against retain-ing parts secured to said rotor, and on its front side, backing surfaces for wedges which bear against said rotor and keep said beater bar in engagement with the said retaining parts, characterized in that each beater bar has a - 4a -108402~
cross-section having two rearwardly angled sections arranged on opposite sides of a plane of symmetry said backing surface, on the front side of each beater bar extending at right angles to the plane of symmetry thereof. Each bar is clamped with a generally radially directed outer part, in such a manner that the inner part is bent backwards in relation to the peripheral direction of the rotor, since this makes it possible to shape in a satisfactory manner the recesses provided at the periphery, the contours of which fit as closely as possible around the parts used to clamp the beater bars and the beater bars themselves, in view of the configuration of the jaws between which the said beater bars are clamped. This is particularly important in the case of ro-tors consisting of a plurality of rotor discs secured to a common axis.
Since the rotor surfaces between which the beater bars are clamped require machining, it is desirable for the surfaces of the retaining parts against which the rear of the beater bars bear, and the surfaces against which the wedge surfaces bear, are parallel.
Figures 1 and 2 of the drawing illustrate diagrammatically cross-R ~;e~S
sectional woavo of two embodiments of the beater bar according to the invention incorporated into an impact-crusher rotor.
Beater bar 1 is incorporated into a rotor consisting of a plurality of rotor discs 2 secured on a common axis (not shown). The discs have a plurality of and, e.g. four, peripheral recesses 3, to the rear edges 4 of which, as seen in the direction of rotation (arrow "a"), a retaining part in the form of a supporting beam 5 is secured by welding. The front face of the supporting beam, against which the rear of the beater bar bears, consists of an outer part 6 extending approximately radially, and a part 7 at an angle thereto and pointing inwardly to a greater or lesser degree.
Provided at the front edge 8 of recess 3 is a protective cap 9 en-gaging with the edge and provided with a projecting edge 10 engaging in a corresponding groove 11 in edge 8. The back of the cap carries a guide groove 1084~Zl 12 in which runs a wedge 13 which can be forced in a radially outward direc~
tion by means of a hydraulic ram 14 located at the bottom of recess 3.
Beater bar 1 has an angled, mirror-symmetrical cross section, the plane of symmetry "b" of the bar passing through the axis shown in dotted linest The rear face of the beater bar has two outer surface portions 15 and two inner surface portions 16 adjacent the plane of symmetry, the latter being slightly raised in relation to the outer surface portions 15 and being machined, The front face of the beater bar has two outer surface portions 17 serving as beating surfaces, and a central surface portion 18 which lies at right angles to plane of symmetry "b", and which serves as a backing surface for wedge 13 and is also machined, Surface portion 18 is required only where there is a wedge, i,e, in the vicinity of each rotor disc 2, Between the discs, the outer surface portions 17 may converge towards the plane of symmetry, as shown in dotted lines, Thus the wedge 13 can serve to prevent the beater bar from being displaced longitudinally, In the case of the beater bar illustrated in Figure 2, inner surface portions 16 are extended beyond plane of symmetry "b", This produces two grooves l9 which are defined outwardly by surfaces 20 by means of which the beater bar bears radially, from the interior, against corresponding backing surfaces 6, 7 of supporting beam 5, This design of beater bar permits a simpler configuration of the supporting beam and improved retention of the beater bar in the rotor. Since the grooves are located on the side of the beater bar to which pressure is applied, the durability of the beater bar is not impaired thereby, However~ contrary to the graphic representation, outer surface portions 17 may run over the width of the beater bar only as far as surface portions 18 and, because of the improved machinability of the clamping surfaces, surface portions 18 may be slightly raised in the width of the wedge,
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A beater bar for impact-crusher rotors, said bar being of revers-ible, elongated, mirror-symmetrical cross section and of substantially constant width, and on its rear side, as seen in the direction of rotation of the rotor, having surfaces by means of which it bears rearwardly and radially from the interior against retaining parts secured to the said rotor, and having, on its front side backing surfaces for wedges which keep the said beater bar in engagement with the said retaining parts, characterized in that the cross section has a plane of symmetry on opposite sides of which are rearwardly-angled sections and in that the backing surfaces for the wedges are located in the middle of the front side and at right angles to the plane of symmetry of the beater bar.
2. A beater bar according to claim 1, characterized in that the rearwardly-angled sections have rear surfaces which converge towards each other at an obtuse angle, and each of which extends for some distance beyond the plane of symmetry and then rearwardly at an angle, thus producing two longitudinal grooves.
3. A beater bar according to claim 2, characterized in that said angle is substantially 90°.
4. A beater bar according to claim 2 or 3, characterized in that said rear surfaces have machined inner portions adjacent said plane of symmetry which are slightly raised in relation to the remainders of said rear surfaces.
5. A rotor for impact crushers having beater bars which are of revers-ible, elongated, mirror-symmetrical cross section and of substantially con-stant width, each beater bar having on its rear side, as seen in the direction of rotation of said rotor, bearing surfaces which engage rearwardly and radially from the interior, against retaining parts secured to said rotor, and on its front side, backing surfaces for wedges which bear against said rotor and keep said beater bar in engagement with the said retaining parts, charac-terized in that each beater bar has a cross-section having two rearwardly-angled sections arranged on opposite sides of a plane of symmetry, said backing surface, on the front side of each beater bar, extending at right angles to the plane of symmetry thereof.
6. A rotor according to claim 5, characterized in that the surfaces of the retaining parts, against which the rear sides of the beater bars bear, and the surfaces of the rotor discs, against which the wedges bear, are parallel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19762606000 DE2606000A1 (en) | 1976-02-14 | 1976-02-14 | BLOW BAR FOR IMPACT MILL ROTORS |
| DEP2606000.4 | 1976-02-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1084021A true CA1084021A (en) | 1980-08-19 |
Family
ID=5969929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA271,622A Expired CA1084021A (en) | 1976-02-14 | 1977-02-11 | Impact-crusher rotors and beater bar therefor |
Country Status (12)
| Country | Link |
|---|---|
| JP (1) | JPS5720268Y2 (en) |
| AT (1) | AT345648B (en) |
| AU (1) | AU502799B2 (en) |
| BE (1) | BE851407A (en) |
| BR (1) | BR7700885A (en) |
| CA (1) | CA1084021A (en) |
| CH (1) | CH602186A5 (en) |
| DE (1) | DE2606000A1 (en) |
| ES (1) | ES226361Y (en) |
| FR (1) | FR2340771A1 (en) |
| GB (1) | GB1558925A (en) |
| MX (1) | MX144602A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0046452A3 (en) * | 1980-08-20 | 1983-03-23 | Bühler AG | Comminuting apparatus |
| GB8408068D0 (en) * | 1984-03-29 | 1984-05-10 | Ansec Design & Eng Ltd | Securing cutting/breaker element to rotatable member |
| FR2580193B1 (en) * | 1985-04-12 | 1988-05-20 | Const Mecaniques Sa Renens | IMPACT SHREDDERS |
| BE1008041A3 (en) * | 1994-02-04 | 1996-01-03 | Magotteaux Int | Rotor for a crusher percussion. |
| BE1009998A3 (en) * | 1996-02-02 | 1997-11-04 | Magotteaux Int | Rotor for a crusher percussion. |
| DE19813308C2 (en) * | 1998-03-26 | 2002-02-28 | Hazemag & Epr Gmbh | Blow bar for impact mill rotors and rotor for impact mills |
| DE10048699C1 (en) * | 2000-09-30 | 2002-01-31 | Hazemag & Epr Gmbh | Beater arm, for impact pulverizer rotor, has curved offset with rotational point of smaller radius of curve of contact faces located a distance away from rotational point of larger radius of curve of support face |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE930839C (en) * | 1951-10-11 | 1955-07-25 | Westfalia Dinnendahl Groeppel | Rotor for centrifugal mills |
-
1976
- 1976-02-14 DE DE19762606000 patent/DE2606000A1/en not_active Ceased
-
1977
- 1977-02-02 FR FR7702913A patent/FR2340771A1/en active Granted
- 1977-02-03 AT AT68277A patent/AT345648B/en not_active IP Right Cessation
- 1977-02-08 AU AU22054/77A patent/AU502799B2/en not_active Expired
- 1977-02-09 GB GB534277A patent/GB1558925A/en not_active Expired
- 1977-02-09 MX MX16799777A patent/MX144602A/en unknown
- 1977-02-10 JP JP1433177U patent/JPS5720268Y2/ja not_active Expired
- 1977-02-11 ES ES1977226361U patent/ES226361Y/en not_active Expired
- 1977-02-11 CA CA271,622A patent/CA1084021A/en not_active Expired
- 1977-02-11 BR BR7700885A patent/BR7700885A/en unknown
- 1977-02-14 CH CH176977A patent/CH602186A5/xx not_active IP Right Cessation
- 1977-02-14 BE BE174919A patent/BE851407A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| AU2205477A (en) | 1978-08-17 |
| ES226361U (en) | 1977-04-01 |
| FR2340771A1 (en) | 1977-09-09 |
| CH602186A5 (en) | 1978-07-31 |
| ES226361Y (en) | 1977-08-01 |
| BR7700885A (en) | 1977-10-18 |
| DE2606000A1 (en) | 1977-08-25 |
| BE851407A (en) | 1977-05-31 |
| JPS52110682U (en) | 1977-08-23 |
| MX144602A (en) | 1981-10-29 |
| ATA68277A (en) | 1978-01-15 |
| AU502799B2 (en) | 1979-08-09 |
| GB1558925A (en) | 1980-01-09 |
| FR2340771B1 (en) | 1982-08-27 |
| AT345648B (en) | 1978-09-25 |
| JPS5720268Y2 (en) | 1982-04-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |