GB2153704A

GB2153704A - Hammer assembly for a rotary material crusher

Info

Publication number: GB2153704A
Application number: GB08501759A
Authority: GB
Inventors: Roger H Quast; Axel W Worphal
Original assignee: QUAST Inc ROGER
Current assignee: QUAST Inc ROGER
Priority date: 1984-01-27
Filing date: 1985-01-24
Publication date: 1985-08-29
Also published as: CA1232251A; GB2153704B; ZA85577B; AU3808785A; JPS60238163A; GB8501759D0; BR8500376A

Abstract

The assembly includes a member (18) rigidly connected to a rotor (12) and an extension (26) of the said member having a longitudinal axis disposed parallel with and spaced from the axis of rotation of the rotor. The extension has a uniform cross-sectional configuration along its length. A cap means (32, 34) is (are) removably connected to the extension for crushing the material on rotation of the rotor, the (each) cap means having an undercut portion which cooperates with the extension to lock the cap means thereto. <IMAGE>

Description

SPECIFICATION Hammer assembly for a rotary material crusher This invention relates to a hammer assembly for attachment to a rotor of a rotary material crusher.

More specifically, this invention relates to a hammer assembly having a reversible cap for crushing rocks and the like.

In view of the high wear factors imposed upon rock crushing machinery, many proposals have been made in an attempt to increase the life of the rock engaging components of such rock crushers.

Traditionally operators of rock crushing machinery have sought to overcome the gradual loss of efficiency due to wear of the rock engaging components by hard face welding metal to the rock engaging components.

When such rock crushers are used for crushing wet and abrasive lime rock, heavy wear factors are imposed on the impact crusher hammers, which necessitates frequent hard face welding to the impact crusher hammers somethimes on a daily basis. In practice four to ten hours a day have been spent by welders endeavoring to maintain the efficiency of such rock crushing machinery. Not only is this welding process an extremely expensive operation, but this operation also involves considerable danger in that it is often necessary for the welder to work in a hostile environment and in cramped locations adjacent the impact crusher hammers.

In order to eliminate this costly and potentially dangerous problem, rock crushing machinery has been produced that enables the easy replacement of rock engaging components. A capping system to replace stock hammers has totally eliminated the need for hard face welding. Such caps for attachment to the hammer carrier are removably fastened to the hammer carrier, and when the caps become worn it is a relatively easy operation to remove the cap and replace the same with new caps.

U.S. Patent No. 3,838,826 teaches a rotor having diametrically-opposed hammer carrier. Each of the hammer carrier has a plurality of dovetail undercut grooves disposed substantially tangentially relative the axis of rotation of the rotor. A plurality of hammer caps, each having a dovetail extension extending therefrom, can be slid tangentially relative the hammer carrier, such that the extension and groove cooperate to lock the hammer cap in position relative the hammer carrier. Fastening means are used rigidly to secure the hammer cap relative the hammer carrier.

While this proposal greatly increased the speed with which a rotary crusher could be serviced, this proposal still left a need in the art of a hammer cap that could easily be reversed such that when wear occurred on one of the rock engaging faces of the cap, the cap could be reversed, and thus the considerable expense of replacing a set of hammer caps could be avoided, or at least halved.

The hammer assembly of the present invention in its illustrated embodiment overcomes the aforementioned inadequacies of the prior art devices by providing a reversible cap that can easily be oriented through 180 to present a second hard face into a position for crushing material on rotation of the rotor.

According to the present invention there is pro vided a hammer assembly for attachment to the rotor of a rotary material crusher, said assembly comprising in combination: a hammer member adapted to be rigidly connected to the rotor; an extension of said hammer member, said extension having a longitudinal axis so disposed as to be parallel with and spaced from the axis of rotation of the rotor when mounted on the rotor, said extension having a uniform transverse cross-sectional configuration along the length thereof; and a cap means removably connected to said extension for crushing the material on rotation of the rotor, said cap means having an undercut portion which cooperates with said extension for locking said cap means adjacent said hammer member.

In a more specific embodiment of the invention, the hammer member has a longitudinal channel which has a longitudinal axis extending parallel to the axis of rotation of the rotor. The hammer member also has a plurality of first bores which extend from the longitudinal channel through the hammer member, each of the first bores having a longitudinal axis disposed substantially tangentially relative the axis of rotation of the rotor. The hammer member further includes a first fastening means which extend through the first bores for fastening the hammer member to the rotor.

The extension has therethrough, in an exemplary embodiment, a plurality of second bores, each of which extends through the hammer member and the extension such that the longitudinal axes of the second bores are disposed substantially tangentially relative the rotational axis of the rotor. The extension extends from the opposite side of the hammer member relative the longitudinal channel, and the extension is disposed at a greater radial distance from the axis or rotation of the rotor relative the radial distance of the longitudinal channel from the axis of rotation of the rotor.

The cap further includes a first and a second hard face which extends respectively along a first and a second portion of the outer surface of the cap, the first and the second hard faces, respectively, being disposed parallel relative the axis or rotation of the rotor. The cap also has a plurality of third bores, each of which are disposed transverse relative the cap and tangentially relative the axis of rotation of the rotor, such that when the cap is locked adjacent the hammer member the third bores are in alignment with and correspond with the plurality of the second bores, which extend through the hammer member and the extension. A second fastening means extends through the second and third plurality of bores for fastening the cap adjacent to the hammer member.The cap means are reversible such that the cap means may be oriented through 180 about the longitudinal axis of the second and third plurality of bores.

In a preferred embodiment of the invention, each of the third bores is disposed substantially midway between the first and the second hard faces such that when the cap means is oriented through 180 about the longitudinal axis of the second and third plurality of bores the positions occupied by the first and the second hard faces relative to said hammer member are interchanged.

The undercut portion defined by the cap means is of the same general transverse cross-sectional configuration as the extension, but is of slightly greater dimensions such that the cap means may be slid longitudinally relative the extension to slide the cap into locking engagement with the extension. In the preferred embodiment of the present invention, a pair of cap means cooperates with each of the hammer members such that the cap means may be installed by sliding the cap means longitudinally and parallel relative the axis of rotation of the rotor. Also in the preferred embodiment of the present invention, the extension and the undercut portion are both of uniform dovetail cross-sectional configuration along the length thereof.

The invention will be further described, by way of example, with reference to the accompany drawings, in which: Figure 1 is a perspective view partially cut away of a hammer assembly for attachment to the rotor of a rotary material crusher according to the present invention; Figure 2 is a rear elevational view of the hammer member; Figure 3 is a sectional view taken on the line 3-3 of Figure 2; Figure 4 is a top plan view of the hammer member as shown in Figure 3; Figure 5 is a bottom plan view of the hammer member as shown in Figure 3; Figure 6 is an enlarged sectional view taken on the line 6-6 of Figure 1 showing the cap; and Figure 7 is a front elevational view of one of the caps when viewed from the leading side.

Figure 1 is a perspective view of a rotary material crusher generally designated 10. The rotary material crusher 10 includes a rotor 12 mounted on a shaft 14.

A hammer assembly generally designated 16 is rigidly mounted adjacent the periphery of the rotor 12. The hammer assembly 16 includes a hammer member 18, which is rigidly connected to the rotor 12 by means of a plurality of fastening bolts to be described hereinafter. The hammer member 18 has a front face 20 and a rear face 22. The rear face 22 of the hammer member 18 defines a longitudinal channel 24 which extends parallel to the axis of rotation of the rotor 12. The longitudinal channel 24 cooperates with a correspondingly-shaped protru sion formed on the rotor 12, such that the hammer member 18 may be located and correctly oriented relative the rotor 12. The front face 20 of the hammer member 18 includes a dovetail-shaped extension 26.

The dovetail extension 26 extends longitudinally along the front face 20 ofthe hammer member 18 and extends parallel to the axis of rotation of the rotor 12. The hammer member 18 further includes a top face 28 and a bottom face 30. As shown in Figure 1, the longitudinal channel 24 is located near the bottom face 30, and the dovetail extension 26 is located near the top face 28 of the hammer member 18. A first cap generally designated 32 is secured adjacent the hammer member 18 near the top face 28 of the hammer member 18. A second cap generally designated 34 is also disposed adjacent the top face 28 of the hammer member 18 and in side-by-side relationship relative the first cap 32.

Figure 2 is a rear elevational view of the hammer member 18 showing the rear face 22 of the hammer member 18. The channel 24 as shown in Figure 2 defines five equally-spaced first bores 36,37, 38, 39 and 40. Fastening means including threaded bolts, one of which is shown in Figure 2 and designated 42 extends through the first bore 38 and threadably engages a corresponding threaded bore in the rotor 12 to secure the hammer member 18 adjacent the rotor 12.

Figure 3 is a sectional view of the hammer member 18 taken on the line 3-3 of Figure 2 and shows the longitudinal channel 24 and the bolt 42 extending through the first bore 38. Figure 3 also shows the dovetail-shaped extension 26. Figure 2 shows four second bores 44,45,46, and 47 which extend through the hammer member 18 and the dovetail-shaped extension 26. Figure 3 shows the second bore 45 extending through the hammer member 18 and the extension 26.

Figure 4 is a top plan view of the hammer member 18 showing the top face 28 and the dovetail-shaped extension 26.

Figure 5 is a bottom plan view of the hammer member 18 showing the bottom face 30 and the dovetail extension 26.

Figure 6 is an enlarged sectional view taken on the line 6-6 of Figure 1 and shows the first cap 32. The first cap 32 includes a first hard face 48 which extends longitudinally along a first portion 50 of the outer surface of the cap 32, the first portion 50 of the outer surface being disposed parallel relative the axis of rotation of the rotor 12. A second hard face 52 extends longitudinally along a second portion 54 of the outer surface of the cap, the second portion being disposed parallel relative the axis of rotation of the rotor. The first and the second hard faces 48 and 52, respectively, are disposed on opposite sides of the cap 32, and a third bore 56 disposed midway between the hard faces 48 and 52 extends through the cap 32. The cap 32 includes a leading face 58 and a trailing face 60. The trailing face 60 defines an undercut portion 62 of dovetail-shaped configuration, the undercut portion 62 being of slightly greater dimensions than the external dimensions of the extension 26 of the hammer member 18. The undercut portion 62 extends longitudinally along the length of the first cap 32 such that the extension 26 and the undercut portion 62 may cooperate together to lock the first cap 32 relative the hammer member 18. The third bore 56 extends from the leading face 58 of the first cap 32 towards the base 64 of the undercut portion 62. A second fastening means shown in Figure 6 as a threaded bolt 66 extends through the third bore 56 and engages and extends through the second bore 44 of the hammer member 18. The bolt 66 engages a nut (not shown) such that the cap 32 may be securely fastened to the hammer member 18.The second and third bores 44 and 56, respectively, have a longitudinal axis substantially disposed tangentially relative the axis of rotation of the rotor 12.

Figure 7 is a front view of the first cap generally designated 32 and shows the leading face 58 of the cap 32. The first cap 32 includes two third bores designated 56 and 68, respectively, and the first and second hard faces 48 and 52, respectively, are disposed at substantially equal distances from the third bores 56 and 68, respectively. The second cap 34 shown in Figure 1 is of identical dimensions to the cap 32, as described hereinbefore, and the cap 34 defines a plurality of third bores designated 70 and 71, respectively.

In operation of the rotary material crusher 10 when the shaft 14 is rotated, the rotor 12 will rotate in a counterclockwise direction when viewed as showed in Figure, 1 and the first hard face 48 of the cap 32 and the corresponding first hard face of the cap 34 will react with and crush material fed into the rotary material crusher. After a period of operation, due to the abrasive and wear-imparting characteristics of the material to be crushed, the hard face 48 and the corresponding hard face of the second cap 34 will become worn. When such wear has taken place, the rotary material crusher is shut down and the second fastening means, including bolt 66, fastening the caps 32 and 34 to the hammer member 18 are released.The caps 32 and 34, respectively, are slid laterally to disengage the same from the extension 26, and the caps are oriented through 180 and are slid longitudinally along the extension 26 such that the second hard face 52 and the corresponding second hard face of the second cap 34 are disposed in the position previously occupied by the first hard face. The bolts 66 are once again inserted through the third bores 56,68,70 and 71, respectively, and the caps 32 and 34 are securely fastened to the hammer member 18 and the material crusher will once again be ready for operational use.

The reversible caps not only provide a means for rapidly replacing the hard face for continued reaction with the material to be crushed, but also halve the cost of such a wear-compensating operation, because rather than having to replace the caps as has been the case with the prior art machines, the operator merely has to orientate the positions of the respective hard faces. Furthermore, in the prior art replaceable caps it has been necessary to remove the caps tangentially relative the hammer member, and this has often necessitated a maintenance operator climbing into the rotor housing in orderto remove the caps from the hammer arm. With the present construction, in view of the fact that many conventional rotary material crushers have a side access door disposed adjacent the side of the hammer member, it is possible for the maintenance operator to release the cap fastening means and to slide the caps 32 and 43 longitudinally sideways relative the hammer member and orientate the same relative to the hammer member, thereby avoiding the necessity of the maintenance operator working in a potentially dangerous environment.

Claims

1. A hammer assembly for attachment to the rotor of a rotary material crusher, said assembly comprising in combination: a hammer member adapted to be rigidly connected to the rotor; an extension of said hammer member, said extension having a longitudinal axis so disposed as to be parallel with and spaced from the axis of rotation of the rotor, when mounted on the rotor, said extension having a uniform transverse cross-sectional configuration along the length thereof; and a cap means removably connected to said extension for crushing the material on rotation of the rotor, said cap means having an undercut portion which cooperates with said extension for locking said cap means adjacent said hammer member.

2. A hammer assembly as claimed in claim 1 wherein said hammer member is provided with a longitudinal channel having a longitudinal axis extending parallel to the axis of rotation of the rotor.

3. A hammer assembly as claimed in claim 2, wherein said hammer member is provided with a plurality of first bores extending from said longitudinal channel through said hammer member, each of said first bores having a longitudinal axis disposed substantially tangentially relative the axis of rotation of said rotor.

4. A hammer assembly as claimed in claim 3, wherein said hammer member further includes: first fastening means extending through said first bores for fastening said hammer member to the rotor.

5. A hammer assembly as claimed in any one of claims 2 to 4, wherein said extension extends from a front face of said hammer member and said longitudinal channel is provided in a rearface of said hammer member.

6. A hammer assembly as claimed in claim 5, wherein said extension is disposed at a greater radial distance from the axis of rotation of the rotor than is said longitudinal channel.

7. A hammer assembly as claimed in any preceding claim wherein said extension has a plurality of second bores each of which extend through said hammer member and said extension, each of said second bores having a longitudinal axis disposed substantially tangentially relative the rotation axis of said rotor.

8. A hammer assembly as claimed in any preceding claim, wherein said cap means further includes: a first hard face, said first hard face extending longitudinally along a first portion of the outer surface of said cap means, said first portion of the outer surface being disposed parallel relative the axis of rotation of the rotor for crushing the material on rotation of the rotor.

9. A hammer assembly as claimed in claim 8, wherein said cap means further includes: a second hard face, said second hard face extending longitudinally along a second portion of the outer surface of said cap means, said second portion of the outer surface being disposed parallel relative the axis of rotation of the rotor, said second hard face being disposed substantially opposite said first hard face.

10. A hammer assembly as claimed in claim 9, wherein said cap means has a plurality of third bores therethrough, said third bores each having a longitudinal axis disposed transverse relative said cap means and tangentially relative the axis of rotation of the rotor such that when said cap means is locked adjacent said hammer member, said third bores are in alignment with and correspond with a plurality of second bores which extend through said hammer and said extension.

11. A hammer assembly as claimed in claim 10 when appendant to claim 7, wherein second fastening means are provided extending through said second and said third bores for fastening said cap means to said hammer member.

12. A hammer assembly as claimed in claim 11, wherein said cap means is reversible such that said cap means may be oriented through 180 about the longitudinal axis of said second and third plurality of bores.

13. A hammer assembly as claimed in claim 10, 11 or 12, wherein each of said third bores is disposed substantially midway between said first and said second hard faces such that when said cap means is oriented through 180 about the longitudinal axis of said second and third plurality of bores the positions occupied by said first and said second hard faces relative said hammer member are interchanged.

14. A hammer assembly as claimed in any preceding claim, wherein said undercut portion is of the same general transverse cross-sectional configuration as said extension but of slightly greater dimensions such that said cap means may be slid longitudinally relative said extension to slide said cap means into locking engagement with said extension.

15. A hammer assembly as claimed in claim 14, wherein a pair of said cap means cooperate with each of said hammer members, each of said cap means being installed by sliding said cap means longitudinally and parallel relative the axis of rotation of said rotor.

16. A hammer assembly for attachment to a rotor of a rotary material crusher, said assembly comprising a hammer member rigidly connected to the rotor; an extension of said hammer member, said extension having a longitudinal axis disposed parallel and spaced relative the axis of rotation of the rotor, said extension having a uniform dovetail shape transverse cross-sectional configuration along the length of said extension; a cap means removably connected to said extension for crushing the material on rotation of the rotor; said cap means defining an undercut portion having a uniform dovetail shape transverse cross-sectional configuration along the length of said undercut portion for cooperation with said extension for locking said cap means adjacent said hammer member; and a first hard face extending longitudinally along a first portion of the outer surface of said cap means for crushing the material on rotation of the rotor.

17. A hammer assembly for attachment to a rotor of a rotary material crusher, said assembly comprising: a hammer member rigidly connected to the rotor; an extension of said hammer member, said extension having a longitudinal axis disposed parallel and spaced relative the axis of rotation of the rotor, said extension having a uniform dovetail shape transverse cross-sectional configuration along the length of the extension; a cap means removably connected to said extension for crushing the material on rotation ofthe rotor; said cap means defining an undercut portion having a uniform dovetail shape transverse cross-sectional configuration along the length of said undercut portion for cooperation with said extension for locking said cap means adjacent said hammer member; a first hard face extending longitudinally along a first portion of the outer surface of said cap means; a second hard face extending longitudinally along a second portion of the outer surface of said cap means; and second fastening means disposed midway between said first and said second hard faces for fastening said cap means adjacent said hammer member and for permitting orientation of said cap means relative said hammer member to interchange the dispositions of said hard faces relative said hammer member.

18. A hammer assembly for attachment to the rotor of a rotary material crusher, such hammer assembly being constructed and arranged substantially as herein described with reference to and as illustrated in the accompanying drawings.

19. A rotary material crusher including a rotor having thereon a hammer assembly as claimed in any preceding claim.