CA1120966A - Sealing asssembly for ball or rod mills and the like - Google Patents
Sealing asssembly for ball or rod mills and the likeInfo
- Publication number
- CA1120966A CA1120966A CA000312126A CA312126A CA1120966A CA 1120966 A CA1120966 A CA 1120966A CA 000312126 A CA000312126 A CA 000312126A CA 312126 A CA312126 A CA 312126A CA 1120966 A CA1120966 A CA 1120966A
- Authority
- CA
- Canada
- Prior art keywords
- sealing
- sealing edge
- annular seal
- bolt
- seal
- 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
- 238000007789 sealing Methods 0.000 title claims abstract description 70
- 239000011324 bead Substances 0.000 claims abstract description 26
- 230000002093 peripheral effect Effects 0.000 claims abstract description 16
- 239000002002 slurry Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 4
- 229910001141 Ductile iron Inorganic materials 0.000 claims description 2
- 239000002174 Styrene-butadiene Substances 0.000 claims description 2
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 2
- 239000011115 styrene butadiene Substances 0.000 claims description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 239000011236 particulate material Substances 0.000 abstract 1
- 238000000227 grinding Methods 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B43/00—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts
- F16B43/001—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts for sealing or insulation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/22—Lining for containers
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Crushing And Grinding (AREA)
Abstract
SEALING ASSEMBLY FOR BALL OR
ROD MILLS AND THE LIKE
ABSTRACT OF THE DISCLOSURE
An annular seal and a metal washer form a sealing assembly for a bolt fitted to a machine subject to vibra-tions and other forces likely to cause conventional seals to fail. The resilient or deformable seal has a central opening defined by a peripheral sealing edge. The circum-ference of the seal is bevelled to provide other sealing edges. There are sealing beads on opposite faces of the seal near both the opening and the bevelled edges. The relatively non-deformable washer is adapted to bear against the seal and clamp it to a surface of the machine when a nut is tightened on the bolt. This washer has a central opening and an inner face extending to an inclined sealing edge opposing a peripheral sealing edge of the seal. The arrange-ment is such that the annular seal when compressed effec-tively stops the leakage of water and particulate material through the bolt hole.
ROD MILLS AND THE LIKE
ABSTRACT OF THE DISCLOSURE
An annular seal and a metal washer form a sealing assembly for a bolt fitted to a machine subject to vibra-tions and other forces likely to cause conventional seals to fail. The resilient or deformable seal has a central opening defined by a peripheral sealing edge. The circum-ference of the seal is bevelled to provide other sealing edges. There are sealing beads on opposite faces of the seal near both the opening and the bevelled edges. The relatively non-deformable washer is adapted to bear against the seal and clamp it to a surface of the machine when a nut is tightened on the bolt. This washer has a central opening and an inner face extending to an inclined sealing edge opposing a peripheral sealing edge of the seal. The arrange-ment is such that the annular seal when compressed effec-tively stops the leakage of water and particulate material through the bolt hole.
Description
~LZ~
This invention re]ates to a sealing assembly which is particularly intended for use on equipment employed by the mining and cement industries~
Machines such as a ball mill used to grind ore presents special sealing problems due main:Ly to the exces-sive vibrations which is encountered and the presence of highly abrasive material in the water which tends to escape through various wall openings. When conventional sealing means are used, it is not long before the abrasive slurry contained in the mill finds its way out and drops out onto walkways and other areas near the machine. As a result, there is a clean-up problem which re~uires the attention of one or more workmen and eventually the problem worsens to the extent that the mill must be shut down for a lengthly period to allow the leaking seals to be replaced.
The present invention solves a sealing problem of the foregoing type by providing an assembly which consists of a rubber-type seal and a metal washer. These two simply constructed parts co-operate to provide a positive and long-lasting seal which greatly reduces the cost of maintainingand operating ball or rod mills as well as cement grinders and the like.
According to one embodiment of the invention, there i9 provide~1 a sealing assembly for use on a bolt projecting through a hole in a wall enclosing slurry or the like which comprises an annular seal formed o~ a de~ormable material adapted to be inserted over the bolt into con-tact with an outer surface of the wall, said annular seal having a central opening bordered by a peripheral sealing edge and an outer face encircled by a bevelled sealing edge, the outer l~Z~6~i face and the sealing edge defining between them an included angle greater than 90, and a substantially non-deformable washer adapted to be fitted to the bolt to bear against the outer face of the annular seal, said washer having an inner face and an inclined sealing edge shaped to engage the bevelled sealing edge of the annular seal, so that said annular seal can be compressed against the outer surface of the wall and extruded radially towards the bolt in response to a clamping force applied when a nut is tightened on the bolt to wedge the inclined sealing edge against the bevelled sealing edge whereby the peripheral sealing edge is forced into slurry-tight engagement with the bolt.
Another e~odiment of the present invention con-templates the use of an annular seal having an inwardly projecting and cross sectionally tapered sleeve neax the peripheral sealing edge, said sleeve being enterable into the bolt hole and providing an extension of the peripheral sealing edge.
In drawings which illustrate preferred embodiments of the invention;
Figure 1 is a perspective view of a ball mill fitted with the present sealing assembly, Figure 2 is an enlarged vertical section of a wall of the ball mill showing a sealing assembly in posi-tion of use, Figure 3 is a plan view of an annular seal of the present assembly, Figure 4 is a transverse section taken on the line 4-4 of Figure 3, Figure 5 is a perspective view of a washer forming part of the sealing assembly,
This invention re]ates to a sealing assembly which is particularly intended for use on equipment employed by the mining and cement industries~
Machines such as a ball mill used to grind ore presents special sealing problems due main:Ly to the exces-sive vibrations which is encountered and the presence of highly abrasive material in the water which tends to escape through various wall openings. When conventional sealing means are used, it is not long before the abrasive slurry contained in the mill finds its way out and drops out onto walkways and other areas near the machine. As a result, there is a clean-up problem which re~uires the attention of one or more workmen and eventually the problem worsens to the extent that the mill must be shut down for a lengthly period to allow the leaking seals to be replaced.
The present invention solves a sealing problem of the foregoing type by providing an assembly which consists of a rubber-type seal and a metal washer. These two simply constructed parts co-operate to provide a positive and long-lasting seal which greatly reduces the cost of maintainingand operating ball or rod mills as well as cement grinders and the like.
According to one embodiment of the invention, there i9 provide~1 a sealing assembly for use on a bolt projecting through a hole in a wall enclosing slurry or the like which comprises an annular seal formed o~ a de~ormable material adapted to be inserted over the bolt into con-tact with an outer surface of the wall, said annular seal having a central opening bordered by a peripheral sealing edge and an outer face encircled by a bevelled sealing edge, the outer l~Z~6~i face and the sealing edge defining between them an included angle greater than 90, and a substantially non-deformable washer adapted to be fitted to the bolt to bear against the outer face of the annular seal, said washer having an inner face and an inclined sealing edge shaped to engage the bevelled sealing edge of the annular seal, so that said annular seal can be compressed against the outer surface of the wall and extruded radially towards the bolt in response to a clamping force applied when a nut is tightened on the bolt to wedge the inclined sealing edge against the bevelled sealing edge whereby the peripheral sealing edge is forced into slurry-tight engagement with the bolt.
Another e~odiment of the present invention con-templates the use of an annular seal having an inwardly projecting and cross sectionally tapered sleeve neax the peripheral sealing edge, said sleeve being enterable into the bolt hole and providing an extension of the peripheral sealing edge.
In drawings which illustrate preferred embodiments of the invention;
Figure 1 is a perspective view of a ball mill fitted with the present sealing assembly, Figure 2 is an enlarged vertical section of a wall of the ball mill showing a sealing assembly in posi-tion of use, Figure 3 is a plan view of an annular seal of the present assembly, Figure 4 is a transverse section taken on the line 4-4 of Figure 3, Figure 5 is a perspective view of a washer forming part of the sealing assembly,
-2-~Z~66 Figure 6 is a vertical section showing the sealing assembly in position of use, Figure 7 is an isometric quarter section showing a modified form of annular seal, and Figure 8 is a vertical section showing the annular seal of Figure 6 in position of use.
Referring first to Figure 1, the numeral 10 in-dicates generally a ball mill which provides a good example of where it is advantageous to use the present invention.
This type of mill is widely used in the mining industry to reduce ores to a slurry as one step in the milling process.
The mill includes a hollow drum 11 which is partly filled with steel grinding balls and ore (not shown) so that, when the drum is rotated, the required grinding action takes place.
In Figure 2, the drum 11 will be seen to have a cylindrical wall 12 which is formed of a liner 14 and a shell 15. A typical liner 14 is constructed of heavy metal wear plates each of which is secured to the relatively thin metal liner by a number of suitably spaced bolts 18. To receive such a bolt, the wall 12 is provided with a hole 20 which usually is about one quarter of an inch larger in diameter than the shank of the bolt. The liner plates are recessed as at 21 to receive the head 22 of the bolt which is then held against rotation about its lonyitudinal axis.
A nut 23 is fitted to the bolt to clamp an assembly against the outer surface of the drum wall so that the hole 20 is properly sealed against the li~uified contents of the drum.
The sealiny assembly which forms the basis of the - 30 present invention is indicated generally by the numeral 30 ~ -3-~lZ~6~;
and, in Figures 3 and 4, one part of this assembly is shown to comprise an annular seal 32. The seal generally in-dicated at 32 is formed of a synthetic rubber and styrene butadiene having a hardness of 70 durometer S.B.R. has been found to be particularly well suited for the purpose. The material provides a seal which is flexible and tough and therefor is capable of being altered in shape when installed in position of use. The seal 32 has opposite, parallel faces 34. A circular hole 36 in the seal provides a flat, peripheral sealing edge 38 which is concentric to circum-ference 39 of the seal. Between the circumference 39 and the opposite face 34, the seal is bevelled to provide sealing edges 42 which are at 90 to one another. Circular beads 45 integrally formed with the seal are located on the faces 34 at the edge 38. Similarly formed circular beads 46 join the bevelled sealing edges 42 and the opposite faces 34 of the annular seal. The beads 45 and 46 are semi-circular in cross section and the radius of the former bead is substantially twice that of the latter bead.
It will be noted that the annular seal 32 is provided with two bevelled sealiny edges 42 although only one such edge is required for reasons which will be made apparent later. The beads 45 and 46 on one of the faces of the seal might be dispensed with in some installations but, preferably, the seal is made symmetrical or identical on either side as described and illustrated so that it can be used with either face 34 towards the wall 12 thus avoiding the possibility of being incorrectly installed.
The sealing assembly 30 also includes a washer 50 which is best shown in detail Figures 5 and 6. The substan-~ 4-... .
V~66 tially cup-shaped washer generally indicated at 50 is made of a ductile iron which is heat treated so as to be capable of resisting failure through fracture, bending, deformation or fatigue under torque or impact loadings. Such a washer 5 is extremely durable and is reusable over and over again.
A central opening 52 in the washer has a di ameter only slightly smaller than the diameter of the bolt hole 20.
Outer and inner faces 54 and 55 of the washer are parallel and a rim 56 of this seal-retaining member is inwardly 10 turned to provide an inclined sealing edge 57 which is disposed at an included angle of 135 with respect to the inner face 55. This angle was arrived at by careful experi-mentation and is a function of the thickness of the seal 32, the relative hardness of the seal and the washer, and the 15 torque values which are intended to be used on a particular size and grade of bolt 18.
The sealing action achieved by -this invention can best be understood with reference to Figure 6 Iwhich shows the nut 23 fully tightened on the bolt 18 with the assembly 20 30 interposed between the nut and the outer face of the wall 12 of the ball mill. Sufficient torque is applied to the nut to bring the washer into contact with the outer surface of the wall 12 and the resulting compressive force exerted on the seal 32 flattens and traps this resilient member 25 beneath the cup-shaped washerO As a result, the seal is distorted and compressed and this results, amongst other things, in the rubber-like material being forced towards the bolt so that the sealing edge 38 is clamped firmly around the circumference o:E the bolt to stop leakage at this 30 point. The pressure applied to the seal is such that the ~ -5-., .~
l~Z~6~
edge 38 is Eorced into the threads on the bolt whereupon the sealing action is positive. The circular beads 45 and 46 on the inner face of the seal are flattened against the wall 12 to exert maximum pressures which stops slurry leaking out between the seal and the wall. The corresponding beads on the outer face of the seal block leakage of the slurry into the opening 52 and towards the abutting edges 42 and 57.
The several beads increase the density of the seal in their immediate vicinity to further improve the sea]ing action.
As previously mentioned, the grinding action of the ball mill is accompanied by a great deal of vibration and some of this vlbrational force is transmitted to the bolt and washer. Since the ductile washer 50 bears against the wall 12, the seal 32 is prevented from bouncing which might reduce the effectiveness of the assembly. Thus, the water and finer particles of ore which ma]~e up the slurry within the mill cannot work its way passed the tightly-clamped peripheral sealing edge 38 at least until the mill has been in operation for some time and wear occurs in the bolt 18 or adjacent parts of the drum. The inwardly turned rim 56 in the washer and the provision of the 45 face 57 ensures that the seal is squeezed radially towards the bolt so that the edge 38 is molded around and forced into the threads on the bolt, one bead 45 being extruded into the hole 20 and the opposite bead 45 being forced a lesser distance into the smaller opening 52 in the washer. It will be noticed that one of the bevelled edges 42 disappears as a result of the compressive force which is applied to the seal. Two bevelled edges 42, therefore, are not absolutely essential on the seal 32.
Referring now particularly to Figure 7, the numeral 60 indicates generally a modified form of seal which can be used with the washer 50. This seal 60 has outer and inner faces 62 and 63, a central opening 64 defined by a peripheral sealing edge 65, and a circumference 66 bordered by bevelled sealing edges 67. There is a circular bead 70 on the outer face of this seal. Another relatively small radius bead 71 is located on the outer face 62 near the adjacent bevelled sealing edge 67.
The inner face 63 is provided with an integrally formed flange-like sleeve 75 which is tapered in cross section. Thus, the sleeve extends or elongates peripheral sealing edge 65 which is clamped to the bolt as will be described later. The sloping side 77 of the sleeve is encircled by a bead 78 formed on the inner face 63 and, preferably, this bead is of the same radius as the adjoining bead 71. Another bead 79 is provided on the face 63 oppo-site the bead 71.
The seal 60 is shown in position of use in Figure 8 which shows a hole 20a enlarged by extensive wear so that a seal 32 is no longer entirely effective. When wear of this magnitude is encountered, the seal 60 is employed since the sleeve 75 enters the hole for a short distance at least to increase the sealing action. The seal 60 is compressed or clamped between the washer 60 and the wall 12 and the elongated edge 65 is pressed firmly into contact with the bolt 18. The compressed beads 79 and 78 seal against the outer surface of the wall 12. In a like manner, the beads 70 and 71 seal against the inner face 55 of the washer so that there is little likelihood of slurry leaking out of the oversize hole.
~12~9~6 From the foregoing, it will be apparent there is provided a particularly effective sealing assembly for a machine such as a ball mill which is subjected to heavy vibration and extensive wear. The plates 14 eventually wear down to a point where they must be replaced and it is good policy to replace the nuts and bolts as well at this time.
Of course, the seals 32 are replaced as well and the washers 50 can be used repeatedly to reduce maintenance costs.
Occasionally, excessive wear may be allowed to develop between overhauls at least to the extent that the bolt hole in the mill wall is enlarged or distorted but it is a simple matter to substitute a seal 60 for a seal 32 if such wear does occur.
Referring first to Figure 1, the numeral 10 in-dicates generally a ball mill which provides a good example of where it is advantageous to use the present invention.
This type of mill is widely used in the mining industry to reduce ores to a slurry as one step in the milling process.
The mill includes a hollow drum 11 which is partly filled with steel grinding balls and ore (not shown) so that, when the drum is rotated, the required grinding action takes place.
In Figure 2, the drum 11 will be seen to have a cylindrical wall 12 which is formed of a liner 14 and a shell 15. A typical liner 14 is constructed of heavy metal wear plates each of which is secured to the relatively thin metal liner by a number of suitably spaced bolts 18. To receive such a bolt, the wall 12 is provided with a hole 20 which usually is about one quarter of an inch larger in diameter than the shank of the bolt. The liner plates are recessed as at 21 to receive the head 22 of the bolt which is then held against rotation about its lonyitudinal axis.
A nut 23 is fitted to the bolt to clamp an assembly against the outer surface of the drum wall so that the hole 20 is properly sealed against the li~uified contents of the drum.
The sealiny assembly which forms the basis of the - 30 present invention is indicated generally by the numeral 30 ~ -3-~lZ~6~;
and, in Figures 3 and 4, one part of this assembly is shown to comprise an annular seal 32. The seal generally in-dicated at 32 is formed of a synthetic rubber and styrene butadiene having a hardness of 70 durometer S.B.R. has been found to be particularly well suited for the purpose. The material provides a seal which is flexible and tough and therefor is capable of being altered in shape when installed in position of use. The seal 32 has opposite, parallel faces 34. A circular hole 36 in the seal provides a flat, peripheral sealing edge 38 which is concentric to circum-ference 39 of the seal. Between the circumference 39 and the opposite face 34, the seal is bevelled to provide sealing edges 42 which are at 90 to one another. Circular beads 45 integrally formed with the seal are located on the faces 34 at the edge 38. Similarly formed circular beads 46 join the bevelled sealing edges 42 and the opposite faces 34 of the annular seal. The beads 45 and 46 are semi-circular in cross section and the radius of the former bead is substantially twice that of the latter bead.
It will be noted that the annular seal 32 is provided with two bevelled sealiny edges 42 although only one such edge is required for reasons which will be made apparent later. The beads 45 and 46 on one of the faces of the seal might be dispensed with in some installations but, preferably, the seal is made symmetrical or identical on either side as described and illustrated so that it can be used with either face 34 towards the wall 12 thus avoiding the possibility of being incorrectly installed.
The sealing assembly 30 also includes a washer 50 which is best shown in detail Figures 5 and 6. The substan-~ 4-... .
V~66 tially cup-shaped washer generally indicated at 50 is made of a ductile iron which is heat treated so as to be capable of resisting failure through fracture, bending, deformation or fatigue under torque or impact loadings. Such a washer 5 is extremely durable and is reusable over and over again.
A central opening 52 in the washer has a di ameter only slightly smaller than the diameter of the bolt hole 20.
Outer and inner faces 54 and 55 of the washer are parallel and a rim 56 of this seal-retaining member is inwardly 10 turned to provide an inclined sealing edge 57 which is disposed at an included angle of 135 with respect to the inner face 55. This angle was arrived at by careful experi-mentation and is a function of the thickness of the seal 32, the relative hardness of the seal and the washer, and the 15 torque values which are intended to be used on a particular size and grade of bolt 18.
The sealing action achieved by -this invention can best be understood with reference to Figure 6 Iwhich shows the nut 23 fully tightened on the bolt 18 with the assembly 20 30 interposed between the nut and the outer face of the wall 12 of the ball mill. Sufficient torque is applied to the nut to bring the washer into contact with the outer surface of the wall 12 and the resulting compressive force exerted on the seal 32 flattens and traps this resilient member 25 beneath the cup-shaped washerO As a result, the seal is distorted and compressed and this results, amongst other things, in the rubber-like material being forced towards the bolt so that the sealing edge 38 is clamped firmly around the circumference o:E the bolt to stop leakage at this 30 point. The pressure applied to the seal is such that the ~ -5-., .~
l~Z~6~
edge 38 is Eorced into the threads on the bolt whereupon the sealing action is positive. The circular beads 45 and 46 on the inner face of the seal are flattened against the wall 12 to exert maximum pressures which stops slurry leaking out between the seal and the wall. The corresponding beads on the outer face of the seal block leakage of the slurry into the opening 52 and towards the abutting edges 42 and 57.
The several beads increase the density of the seal in their immediate vicinity to further improve the sea]ing action.
As previously mentioned, the grinding action of the ball mill is accompanied by a great deal of vibration and some of this vlbrational force is transmitted to the bolt and washer. Since the ductile washer 50 bears against the wall 12, the seal 32 is prevented from bouncing which might reduce the effectiveness of the assembly. Thus, the water and finer particles of ore which ma]~e up the slurry within the mill cannot work its way passed the tightly-clamped peripheral sealing edge 38 at least until the mill has been in operation for some time and wear occurs in the bolt 18 or adjacent parts of the drum. The inwardly turned rim 56 in the washer and the provision of the 45 face 57 ensures that the seal is squeezed radially towards the bolt so that the edge 38 is molded around and forced into the threads on the bolt, one bead 45 being extruded into the hole 20 and the opposite bead 45 being forced a lesser distance into the smaller opening 52 in the washer. It will be noticed that one of the bevelled edges 42 disappears as a result of the compressive force which is applied to the seal. Two bevelled edges 42, therefore, are not absolutely essential on the seal 32.
Referring now particularly to Figure 7, the numeral 60 indicates generally a modified form of seal which can be used with the washer 50. This seal 60 has outer and inner faces 62 and 63, a central opening 64 defined by a peripheral sealing edge 65, and a circumference 66 bordered by bevelled sealing edges 67. There is a circular bead 70 on the outer face of this seal. Another relatively small radius bead 71 is located on the outer face 62 near the adjacent bevelled sealing edge 67.
The inner face 63 is provided with an integrally formed flange-like sleeve 75 which is tapered in cross section. Thus, the sleeve extends or elongates peripheral sealing edge 65 which is clamped to the bolt as will be described later. The sloping side 77 of the sleeve is encircled by a bead 78 formed on the inner face 63 and, preferably, this bead is of the same radius as the adjoining bead 71. Another bead 79 is provided on the face 63 oppo-site the bead 71.
The seal 60 is shown in position of use in Figure 8 which shows a hole 20a enlarged by extensive wear so that a seal 32 is no longer entirely effective. When wear of this magnitude is encountered, the seal 60 is employed since the sleeve 75 enters the hole for a short distance at least to increase the sealing action. The seal 60 is compressed or clamped between the washer 60 and the wall 12 and the elongated edge 65 is pressed firmly into contact with the bolt 18. The compressed beads 79 and 78 seal against the outer surface of the wall 12. In a like manner, the beads 70 and 71 seal against the inner face 55 of the washer so that there is little likelihood of slurry leaking out of the oversize hole.
~12~9~6 From the foregoing, it will be apparent there is provided a particularly effective sealing assembly for a machine such as a ball mill which is subjected to heavy vibration and extensive wear. The plates 14 eventually wear down to a point where they must be replaced and it is good policy to replace the nuts and bolts as well at this time.
Of course, the seals 32 are replaced as well and the washers 50 can be used repeatedly to reduce maintenance costs.
Occasionally, excessive wear may be allowed to develop between overhauls at least to the extent that the bolt hole in the mill wall is enlarged or distorted but it is a simple matter to substitute a seal 60 for a seal 32 if such wear does occur.
Claims (10)
1. A sealing assembly for use on a bolt pro-jecting through a hole in a wall enclosing slurry or the like and comprising an annular seal formed of a deformable material adapted to be inserted over the bolt into contact with an outer surface of the wall, said annular seal having a central opening bordered by a peripheral sealing edge and an outer face encircled by a bevelled sealing edge, the outer face and the bevelled sealing edge defining between them an included angle greater than 90°, and a substantially non-deformable washer adapted to be fitted to the bolt to bear against the outer face of the annular seal, said washer having an inner face and an inwardly inclined sealing edge shaped to engage the bevelled sealing edge of the annular seal so that said annular seal can be compressed against the outer surface of the wall and extruded radially towards the bolt in response to a clamping force applied when a nut is tightened on the bolt to wedge the inwardly inclined sealing edge against the bevelled sealing edge whereby the peri-pheral sealing edge is forced into slurry-tight engagement with the bolt.
2. A sealing assembly as claimed in claim 1, in which said annular seal has an inwardly projecting and cross sectionally tapered sleeve adjacent the peripheral sealing edge, said sleeve being enterable into the bolt hole and providing an extension of the peripheral sealing edge.
3. A sealing assembly as claimed in claim 1 or claim 2, in which said outer face of the annular seal has outwardly projecting circular beads one adjacent the peri-pheral sealing edge and another adjacent the bevelled sealing edge.
4. A sealing assembly as claimed in claim l or claim 2, in which said inwardly inclined sealing edge of the washer is inclined with respect to the inner face of said washer at an included angle of substantially 135°.
5. A sealing assembly as claimed in claim 1, in which said annular seal has an inner face parallel to the outer face thereof, said inner face of the annular seal being encircled by a bevelled sealing edge, a first bead projecting beyond each of the inner and outer faces adjacent the peripheral sealing edge, and a second bead projecting beyond each of the inner and outer faces adjacent the bevelled sealing edges.
6. A sealing assembly as claimed in claim 5, in which said first beads have cross sectional dimensions substantially twice the corresponding dimensions of the second beads.
7. A sealing assembly as claimed in claim 5, in which an included angle between said bevelled sealing edges of the annular seal is substantially 90°.
8. A sealing assembly as claimed in claim 1 or claim 2, in which said annular seal is formed of styrene butadiene having a hardness of approximately 70 durometer S.D.R.
9. A sealing assembly as claimed in claim 1 or claim 2, in which said washer is formed of a ductile cast iron.
10. A sealing assembly as claimed in claim 1 or claim 2, in which said inwardly inclined sealing edge of the washer is shaped to engage the outer surface of the wall when subjected to the clamping force generated by the nut when tightened on the bolt so as to encapsulate the annular seal with the washer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US934,652 | 1978-08-17 | ||
| US05/934,652 US4230326A (en) | 1978-08-17 | 1978-08-17 | Sealing assembly for ball or rod mills and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1120966A true CA1120966A (en) | 1982-03-30 |
Family
ID=25465865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000312126A Expired CA1120966A (en) | 1978-08-17 | 1978-09-26 | Sealing asssembly for ball or rod mills and the like |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4230326A (en) |
| CA (1) | CA1120966A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015085444A1 (en) | 2013-12-13 | 2015-06-18 | American Screw De Chile Limitada | 3-in-1 attachment system for liner plates of mills used to grind minerals |
Families Citing this family (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2621361B1 (en) * | 1987-10-05 | 1990-01-12 | Materiel Equip Tech Cie | IMPROVEMENTS IN FASTENING SYSTEMS INCLUDING NUTS CONTAINED IN CAGES |
| US5476421A (en) * | 1990-08-22 | 1995-12-19 | Duramax, Inc. | Shock absorbing assembly |
| US5588916A (en) * | 1994-02-17 | 1996-12-31 | Duramax, Inc. | Torque control device for rotary mine drilling machine |
| US20060086765A1 (en) * | 2004-10-27 | 2006-04-27 | Sportrack Llc | Sealing member for attachment components |
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| US20070080504A1 (en) * | 2005-10-06 | 2007-04-12 | Henry Buermann | Compressed gas cylinder seal |
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| JP6026122B2 (en) * | 2012-03-27 | 2016-11-16 | 株式会社水道技術開発機構 | Fastening method of seal washer and fluid pipe flange |
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| JP5836340B2 (en) * | 2013-09-10 | 2015-12-24 | 株式会社水道技術開発機構 | Fastening method and pipe reinforcement for fluid pipe flange |
| US9845874B2 (en) * | 2014-02-06 | 2017-12-19 | General Electric Company | Compression seal bracket and system for generator cooler |
| US10232378B2 (en) * | 2015-04-30 | 2019-03-19 | Ronald C. Clarke | Sealing mill liner bolt fastenings |
| US10876569B2 (en) * | 2015-07-28 | 2020-12-29 | Kenneth Maxwell Archer | Locking nut or bolt and washer |
| US10816029B2 (en) * | 2015-10-23 | 2020-10-27 | Alvaro Enrique Endo Arriagada | Device for preventing spills from inside mining mills, said device maintaining a seal around bolts used to secure mill liners, and maintaining said bolts under tension by means of an elastic action |
| WO2017095528A1 (en) * | 2015-12-01 | 2017-06-08 | Illinois Tool Works Inc. | Washer for a fastening clip assembly |
| JP6157577B2 (en) * | 2015-12-22 | 2017-07-05 | 株式会社水道技術開発機構 | Fastening method for sealing member and water pipe flange |
| US10456884B2 (en) * | 2016-05-19 | 2019-10-29 | Polycorp Ltd. | Liner system for a mill shell |
| US10587107B2 (en) * | 2017-09-25 | 2020-03-10 | The Boeing Company | Dual protection inner seal washer for electromagnetic effects (EME) fasteners |
| MX2020004066A (en) * | 2017-10-19 | 2020-11-06 | Security Locknut LLC | Fastener systems and methods. |
| NO348104B1 (en) * | 2017-11-29 | 2024-08-19 | John Oldroyd Cheetham | Disk for fixing and sealing a lining and method for installation and manufacturing the disk |
| US11913487B2 (en) * | 2020-08-31 | 2024-02-27 | Illinois Tool Works Inc. | Sealing nut for electric vehicles |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1453505A (en) * | 1921-10-21 | 1923-05-01 | Robert C Kendall | Cup packing for pistons |
| US2339549A (en) * | 1941-03-06 | 1944-01-18 | Firestone Tire & Rubber Co | Resilient washer |
| US2949325A (en) * | 1956-02-27 | 1960-08-16 | Parker Hannifin Corp | High pressure sealing device |
| US2981232A (en) * | 1957-04-10 | 1961-04-25 | Renault | Differential pressure pneumatic jacks adapted for automatic return to initial position |
| US3247752A (en) * | 1963-12-10 | 1966-04-26 | L J Barwood Mfg Co Inc | Sealing or cushion fastener |
| US3399589A (en) * | 1965-12-29 | 1968-09-03 | Lamson & Sessions Co | Sealing fastener |
| US3422721A (en) * | 1966-08-22 | 1969-01-21 | John L Yonkers | Self-aligning and sealing member |
| US3464309A (en) * | 1967-10-02 | 1969-09-02 | Scovill Manufacturing Co | Bridge washer |
| US3836183A (en) * | 1971-03-17 | 1974-09-17 | Pike And Foundry Co | Flange joint |
| US3973789A (en) * | 1975-04-25 | 1976-08-10 | Chromalloy American Corporation | Coupling structure |
-
1978
- 1978-08-17 US US05/934,652 patent/US4230326A/en not_active Expired - Lifetime
- 1978-09-26 CA CA000312126A patent/CA1120966A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015085444A1 (en) | 2013-12-13 | 2015-06-18 | American Screw De Chile Limitada | 3-in-1 attachment system for liner plates of mills used to grind minerals |
| US10371194B2 (en) | 2013-12-13 | 2019-08-06 | American Screw De Chile Limitada | 3-in-1 attachment system for liner plates of mills used to grind minerals |
Also Published As
| Publication number | Publication date |
|---|---|
| US4230326A (en) | 1980-10-28 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |