CN113117870A - Grate plate and support element thereof, device at discharge end of grinding mill and method for dismounting device - Google Patents
Grate plate and support element thereof, device at discharge end of grinding mill and method for dismounting device Download PDFInfo
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- CN113117870A CN113117870A CN202011590525.7A CN202011590525A CN113117870A CN 113117870 A CN113117870 A CN 113117870A CN 202011590525 A CN202011590525 A CN 202011590525A CN 113117870 A CN113117870 A CN 113117870A
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- 238000000227 grinding Methods 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000002093 peripheral effect Effects 0.000 claims description 26
- 239000007787 solid Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 description 16
- 238000012423 maintenance Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000009419 refurbishment Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000001238 wet grinding Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- 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
- B02C17/183—Feeding or discharging devices
- B02C17/1835—Discharging devices combined with sorting or separating of material
- B02C17/1855—Discharging devices combined with sorting or separating of material with separator defining termination of crushing zone, e.g. screen denying egress of oversize material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
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Abstract
The present disclosure provides a grate plate and a support element thereof, an apparatus at the discharge end of a grinding mill and a method of disassembling the same, the disclosed grate plate (20) for an open grinding mill (2) comprising: a sector or a portion of a sector of a grate (25) of an open mill (2); and at least one grooved section (33) configured to open towards the mill volume (28) side of the grate plate (20) when the grate plate is mounted on the mill (2). The groove portion (33) is provided with at least one through-hole opening (38) for the mounting member.
Description
Background
The present invention relates to grinding mills and more particularly to a grate plate, a grate plate support element, a device at the discharge end of a grinding mill and a method for disassembling the discharge end of a grinding mill.
Grinders, particularly semi-autogenous and autogenous mills, rely on their own ability to produce impact crushing of the ore charge and to convey the ground material out of the mill through a discharge pulp lifter (discharge pulp lifter). Typically, as the diameter and flow rate of the mill increases, the discharge device can limit the performance of the mill in a manner that limits the material transport speed and grinding efficiency. This is because the ground material cannot be conveyed through the grate and the pulp lifter, so that the conveying speed is limited due to the back flow/short circulation (flow back) and cross over (carry over) of the pulp. The effect of this mill flow rate limitation results in a reduction in mill performance (product size) as the resulting slurry pool dissipates the energy of the spheres/ore impacting the bottom of the charge.
An open mill may provide a solution to this problem without the use of a pulp lifter so that the pulp can flow through the grate and out of the mill without obstruction. However, up to now, maintenance of open mills has created difficulties, since it has been necessary to mount and dismount at least some structural components from the interior of the mill, so that at least in some working phases workers have to enter the volume of the mill for some maintenance tasks. This often extends maintenance time and may even compromise the occupational safety of workers.
Disclosure of Invention
The object of the present invention is to provide a new grate plate, a new grate support element, a new device at the discharge end of a grinding mill and a method of disassembling the discharge end of a grinding mill, which are characterized by what is stated in the present disclosure. Some preferred embodiments are disclosed in the present disclosure.
The invention is based on the idea to configure the grate plate and the grate support elements such that the mounting and dismounting of the main parts of the discharge end of the open mill can be performed from outside the mill.
The advantage of the new grate plate, the new grate support elements, the new device at the mill discharge end and the new method of dismantling the mill discharge end is that maintenance of the grate is faster and easier. The present method according to the present solution also allows more efficient use of machinery, even robotics and automation. Thus, the current solutions may reduce the number and/or duration of maintenance breaks required and improve occupational safety.
Drawings
The invention will be described in more detail hereinafter by means of preferred embodiments, with reference to the accompanying drawings, in which:
fig. 1 schematically shows a grinding mill seen from one side;
FIG. 2 schematically shows the open mill from a second end;
fig. 3 shows a part of an open mill in perspective;
FIG. 4 shows a detailed view of the discharge end of the open mill in perspective;
FIG. 5 shows a detailed view of the discharge end of the open mill from one side of the mill;
fig. 6 shows a grate support element according to an example embodiment;
FIG. 7 illustrates a grate plate according to an example embodiment and is shown in perspective from a side configured to point outside the mill;
fig. 8 shows a detailed view of a grinder at a discharge end according to an embodiment;
figures 9 and 10 show different embodiments of the grid plate;
figures 11 to 19 schematically show detailed views of cross-sections of grate plates according to different embodiments;
FIG. 20 shows an exemplary embodiment of the apparatus at the discharge end of the mill; and
fig. 21 shows an embodiment of a method of disassembly of the discharge end of a grinding mill.
The figures are for illustration only and are not shown to scale. For purposes of clarity, not all of the similar features are labeled in the figures.
Detailed Description
Fig. 1 schematically shows a grinding mill 2. Fig. 2 schematically shows the grinding mill 2 seen from the second end 10, in other words the discharge end 10 of the grinding mill. Fig. 1 and 2 show only some features of the grinding machine 1, which are helpful for understanding the present solution. It will be apparent to those skilled in the art that the grinding mill may, and typically does, include other features.
The grinding mill 2 (e.g., the grinding mill of fig. 1) includes a drum that includes a cylindrical shell 11. In the grinding mill 2 of the present solution, the longitudinal axis 9 of the drum is arranged in a substantially horizontal position at the use position of the grinding mill 2. The longitudinal axis 9 of the drum refers to the axis extending from one end of the cylindrical housing to the other along the centre line of the housing 11. Horizontal position refers to a longitudinal axis 9 extending in a substantially horizontal direction. In other words, the longitudinal axis 9 extends in a direction closer to the horizontal direction than the vertical direction. The use position refers to the position in which the grinding machine 2 is arranged when used in a production environment for grinding, for example ore grinding.
The drum comprises a first end 14 at the infeed end of the housing and a second end at the outfeed end 10 of the housing. The feed end refers to the end of the drum to which the material to be ground is fed. The discharge end is the end from which the ground material is discharged from the drum. In wet milling applications, the discharged material comprising the milled material and possibly liquid is also referred to as slurry (slurry) in this application.
The grinding mill 2 may include various processing tasks including, but not limited to, a ball mill, a pebble mill (pebble mill), an autogenous mill (AG mill), or a semi-autogenous mill (SAG mill). The working principle of such mills is known and will not be explained in more detail in this description.
The grinding mill 2 also typically includes a bearing 15 that supports the drum at the discharge end 10. The bearing 15 may comprise any suitable type of bearing, such as a rolling element bearing, a hydrostatic bearing or a hydrodynamic bearing. It should be noted that the grinding mill 2 may also have additional bearings supporting the drum and/or other components of the grinding mill 2. Such bearings 15 for supporting the drum of the grinding mill are known as such bearings and will not be described in more detail.
The grinder 2 may be an open grinder. Open mills refer to mills without discharge trunnions, pulp lifters (pump lifters) for lifting the ground material to the discharge trunnion, or solid discharge head plates (solid discharge head plates). The open mill may include a discharge grate 16 instead of (instead of) discharge trunnions, pulp lifters and a solid discharge top plate, whereby the ground material is discharged through the discharge grate 16. In a completely open mill, the ground material can be discharged without lifting it. According to another embodiment, the open mill 2 may comprise a partial ceiling 23 at the discharge end. Such mills may also be referred to as semi-open mills. The semi-open mill may be similar to a fully open mill but with a partial top plate 23 at the discharge end of the housing, the partial top plate 23 extending partially from the periphery of the housing 11 toward the longitudinal axis 9 of the drum, but without discharge trunnions, and without a conventional pulp lifter. The partial ceiling 23 at the discharge end of the shell may extend from the shell 11 towards the longitudinal axis 9 of the drum a distance which is preferably less than 50% of the length of the shell radius 24, more preferably less than 30% of the length of the shell radius 24 and most preferably less than 15% of the length of the shell radius 24. The region of the discharge end 10 of the drum extending from the inner edge of the partial ceiling 23 towards the longitudinal axis 9 of the drum may define a discharge opening. The discharge opening may be provided with a discharge grate 16. In both types of open mills, in other words in both fully open mills and semi-open mills, the ground material can be discharged directly from the discharge grate 16 into the atmosphere.
Fig. 3 shows a part of the grinding mill 2, more particularly a part of the open grinding mill 2 in a perspective view, fig. 4 shows a detail of the discharge end of the open grinding mill in a perspective view, and fig. 5 shows a detail of the discharge end of the open grinding mill from one side of the grinding mill. Fig. 6 shows a grate support element according to an exemplary embodiment, and fig. 7 shows a grate plate according to an exemplary embodiment, and in a three-dimensional manner from a side configured to be directed to the outside of the mill.
According to one aspect and with reference to fig. 3 to 7, for example, the grate support element 1 for an open mill 2 may comprise an outer peripheral portion 3, an inner portion 4 and at least one blade 5. The vanes 5 may be configured to extend between the outer circumferential portion 3 and the inner portion 4, e.g. radially with respect to the outer circumference 6 of the grate support element 1 or in a curved manner.
The grate support element 1 refers to an element configured to be mounted at the discharge end 10 of the housing 11 of the open mill 2 and to support one or more grate plates of the open mill 2. The inner part 4 refers to the part of the grate support element 1 which is arranged at the end of the grate support element 1 and which is oriented at the discharge end 10 towards the centre 12 of the cross-section of the grinding mill 2 when the grate support element 1 is mounted to the grinding mill 2. Similarly, the peripheral portion 3 refers to the part of the grate support element 1 which is arranged at the end of the grate support element 1, which part is directed away from the centre 12 of the cross-section of the grinding mill 2 at the discharge end 10, in other words at the distal end of the grate support element 1, when the grate support element 1 is mounted to the grinding mill 2.
Fig. 8 shows a detailed view of the discharge end of a grinding mill according to an embodiment.
According to one embodiment, the grate support element 1 for supporting the grate 25 of the open mill 2 may comprise: a peripheral portion 3 oriented towards the centre 12 of the cross-section of the grinding mill 2 in the transverse direction of the grinding mill 2; an inner portion 4, which is oriented away from the centre 12 of the cross-section of the mill 2 in the transverse direction of the mill; and at least one blade 5 extending between the outer peripheral portion 3 and the inner portion 4 in such a manner that the blade 5 has an inner portion side end connected to the inner portion 4 and an outer peripheral portion side end connected to the outer peripheral portion 3. Extending between the outer circumferential portion 3 and the inner portion 4 in such a way that the blade 5 has an inner portion side end connected to the inner portion 4 and an outer portion side end connected to the outer circumferential portion 3 means that the blade has a first end at the outer circumferential portion of the grate support element and a second end at the inner portion of the grate support element.
According to one embodiment, the grate support element 1 may further comprise mounting flanges 30 at the outer circumference of the grate support element 1. The mounting flange 30 is configured to enable mounting of the grate support element 1 to the housing 11 of the mill 2 at a certain area of the housing without intruding into the mill volume 28. The mounting flange 30 may extend outwardly from the center 12 of the cross-section of the grinding mill 2. In other words, the mounting flange 30 may extend from the outer peripheral end of the blade 5 in a direction directed outwardly from the centre 12 of the cross-section of the grinding mill 2. Thus, the mounting flange 30 may form a flange in the shape of a ring, or a flange in the shape of a part of a ring at a part of the outer circumferential portion 3 of the grate support element 1. Thus, when the grate support element 1 is mounted to the grinding mill 2 (e.g. to the housing 11), the mounting flange 30 may be configured to extend beyond the inner circumference of the housing 11 at the discharge end 10, and not to the discharge end opening area of the housing 11. Thus, when the grate support element 1 is mounted to the grinding mill 2 via the mounting flange 30, the mounting flange 30 may be configured to be mounted to the discharge end face of the grinding mill 2 and the housing 11 without protruding into the housing 11 or into the interior volume 28 of the housing 11.
According to one embodiment, the mounting flange 30 may be provided with flange openings 26 configured as bolts for mounting the grate support element 1 to the grinding mill 2. The flange opening 26 may be configured to extend in a horizontal direction through the mounting flange 30 when the grate support element 1 is mounted in the grinding mill 2. In other words, the flange opening 26 may be configured to extend in the longitudinal direction of the grinding mill 2 when the grate support element 1 is mounted to the grinding mill 2. According to another embodiment, at least some of the plurality of flange openings 26 may be configured as blind holes.
According to one embodiment, the mounting flange 30 may be configured to extend outwardly beyond the diameter of the inner volume 28 of the housing 11 of the grinding mill 2 when the grate support element 1 is mounted in the grinding mill 2. In other words, the mounting flange 30 may be configured as an area that does not protrude into the inner circumference of the cylindrical housing 11 of the grinding mill 2 when the grate support element 1 is mounted to the grinding mill 2. This has a number of benefits including not restricting the flow of the ground material and avoiding the presence of highly abrasive surfaces and points of stiffness discontinuity at the discharge end of the housing 11.
According to one embodiment, the grate support element 1 may comprise a mounting surface which is parallel to the end of the housing 11 of the grinding mill 2. Preferably, the mounting surface comprises a surface located in the region of the mounting flange 30. More preferably, the mounting surface comprises a surface in the area of the mounting flange 30, which is configured to be directed towards the housing 11, when the grate support element 1 is mounted to the grinding mill 2, for example to the discharge end of the housing.
According to one embodiment, the blades 5 extend in a radial direction in relation to the cross-section of the mill 2 in a transverse direction between the peripheral portion 3 and the inner portion 4. In such embodiments, when a plurality of grate support elements 1, or one or more grate support elements 1 comprising a plurality of blades 5, are mounted to the grinding mill 2, the blades 5 may thus be configured to extend radially from the outer circumference of the discharge end of the housing 11.
According to one embodiment, the blades 5 extend between the peripheral portion 3 and the inner portion 4 in a curved manner. In such embodiments, the blades may be configured to curve, for example, in the direction of a plane defined by the blades 5, or in a direction transverse to the direction of the plane defined by the blades 5. The plane defined by the blades refers to the plane defined by the direction in which the blades 5 extend from the peripheral portion 3 towards the inner portion 4. Thus, curved in the plane direction means that the blades are curved, or angled, with respect to a radial direction, which is directed from the peripheral edge 8 towards the centre 12 of the cross-section of the grinding mill 2, when the grate support element 1 is mounted to the grinding mill 2. For example, the vanes 5 may be configured to extend in a helical manner from the outer peripheral portion 3 towards the inner portion 4. Similarly, bending in a direction transverse to the direction of the plane defined by the blade 5 means that the blade 5 is configured to bend towards the volume of the grinding mill 2 and/or outwards from the volume of the grinding mill 2 when the blade 5 is mounted on the grinding mill 2. According to one embodiment, the angle or curvature may vary along the length of the blade 5.
According to one embodiment, the open mill 2 comprises: a housing 11 comprising an internal volume 28 for material to be ground; and at least one grate support element 1 according to the embodiments described herein, or a combination of such embodiments, mounted to the housing at the discharge end 10 of the grinding mill 2. According to one embodiment the housing 11 comprises a housing flange 27 extending in a radial direction away from the inner volume of the housing 11, the grate support element 1 being mounted to the housing flange 27 by means of a mounting flange 30.
According to one embodiment the mounting flange 30 and the housing flange 27 are provided with flange openings 26 for bolts for mounting the grate support element 1 to the housing 11. Preferably, at least some of the plurality of flange openings 26 are configured to align when the grate support element 1 is mounted to the housing 11. The flange openings 26 in the mounting flange 30 and the housing flange 27 are preferably configured to extend through the mounting flange 30 and the housing flange 27, respectively. When the grate support element 1 is mounted in the grinding mill 2 and the grinding mill 2 is in the position of use, the grate support element 1 is preferably mounted to the housing 11 by means of bolts extending in a horizontal direction through the mounting flange 30 and the flange openings 26 in the housing flange 27.
According to one embodiment the vanes 5 are provided with at least two vane openings 19 along their length for attaching the grate support element 1 to the grate plate 20.
According to one embodiment, the blades 5 may be angled with respect to the plane 7 defined by the outer edge 8 of the peripheral portion 3 in such a way that the inner portion 4 is configured to be outwardly from the plane 7 defined by the outer edge 8 of the peripheral portion 3 when the grate support element 1 is mounted to the open mill 2. Thus, the blades 5 may be angled with respect to a plane defined by the outer circumference of the grate support element 1. In other words, when the grate support element 1 is mounted to the open mill 2, more particularly at the discharge end 10 of the open mill 2, the inner portion 4 may protrude outwards from the mill volume 28.
According to another embodiment, the grate support element 1 may be flat. In other words, the vanes 5 may extend in a direction parallel, or substantially parallel, to a plane 7 defined by the outer edge 8 of the peripheral portion 3, rather than at an angle to that plane. Thus, in such embodiments, the grate support element 1 as a whole may be configured to be positioned in a vertical position when mounted to the grinding mill 2, rather than protruding outwardly from the volume 28 of the grinding mill 2. These embodiments may be similar to each other in other respects and include similar features and combinations thereof.
According to one embodiment, the angle 13 between the blade 5 and the plane 7 defined by the outer edge 8 of the peripheral portion 3 is in the range of 5 to 30 degrees, in other words, the blade 5 protrudes outwards from the mill volume when the grate support element 1 is mounted (more specifically at the discharge end 10 of the open mill 2) onto the open mill 2, in other words, the blade 5 protrudes outwards from the interior of the housing 11 at the angle 13, the angle 13 being in the range of 5 to 30 degrees.
According to one embodiment, the angle 13 between the blade 5 and the plane 7 defined by the outer edge 8 of the peripheral portion 3 may vary along the length of the blade at one, two or more points, or continuously over the length of the blade. In other words, the angle 13 between the blade 5 and the plane 7 defined by the outer edge 8 of the peripheral portion 3 may be different at different portions of the length of the blade 5 along the length of the blade 5 extending from the peripheral portion 3 towards the inner portion 4. According to another embodiment, the angle 13 between the blade 5 and the plane 7 defined by the outer edge 8 of the peripheral portion 3 may be arranged to vary continuously over the length of the blade 5. Thus, in such embodiments, the vanes 5 may be angled in a curved manner relative to the plane 7 defined by the outer edge 8 of the peripheral portion 3. In another embodiment, the vane 5 may include a same angle along a first portion of the length of the vane 5 and a continuously varying angle along a second portion of the length of the vane 5 relative to a plane 7 defined by an outer edge 8 of the peripheral portion 3.
According to one embodiment the grate support element 1 is in the shape of a conical wheel or a conical disc, or a part of a conical wheel or a part of a conical disc. A grate support element 1 in the shape of a part of a cone wheel or a part of a cone disc means that a plurality of grate support elements 1 arranged adjacent to each other form the shape of a cone wheel or cone disc in such a way that their inner parts 4 are directed to a common central point and their outer peripheral parts 3 are directed away from the common central point.
According to one embodiment, the grate support element 1 and the grate plate 20 are fixedly attached to each other to form a unified structure. According to another embodiment one grate support element 1 alone forms the grate support structure 22.
According to one embodiment the grate support structure 22 comprises at least two grate support elements 1 as described in the present description and the accompanying drawings.
According to one embodiment, the open mill 2 comprises a grate support structure 22 and/or at least one grate support element 1 as described in this specification. According to one embodiment, such an open mill 2 further comprises a grate 25 and a cylindrical shell 11, and a grate support structure 22 mounted to the grate 25 and the cylindrical shell 11. According to another embodiment, the grate support structure 22 is at least removably mounted to the cylindrical housing 11.
According to one embodiment, in the open mill 2 described in this specification, the central part of the grate support structure 22 (including the inner part of the grate support structure 22) extends outwards from the cylindrical housing. More specifically, in such embodiments, a central portion of the grate support structure 22 (including an inner portion of the grate support structure 22) extends outwardly from the cylindrical housing 11 in a longitudinal direction of the cylindrical housing 11.
Fig. 9 and 10 show different embodiments of the grid plate, and fig. 11 to 19 schematically show detailed views of cross-sections of the grid plate according to different embodiments.
According to one aspect, the grate plate 20 for an open mill 2 comprises: a sector or a portion of a sector of the grate 25 of the open mill 2; and at least one recessed portion 33, the recessed portion 33 being configured to open towards the mill volume 28 side of the grate plate 20 when the latter is mounted on the mill 2.
Fig. 7, 9 and 10 show some embodiments of the grid plate 20, and fig. 11 to 19 show some details of the grid plate 20. In other words, the grate plates 20 may comprise the entire sector or section of the grate 25, or two or more grate plates may be configured to be mounted adjacent to each other in the radial direction and/or the circumferential direction along the blades 5 of the grate support element 1. In the embodiment of fig. 7, 9 and 10, each plate comprises two grooved portions 33, one on each side 35 of the plate 20, the sides 35 being configured to be oriented towards the circumferentially adjacent plates 20. In another embodiment, one plate 20 may include a recessed portion 33, for example, at one side 35 of the plate, or at a central region of the plate 20 extending from an inner end 36 of the plate toward an outer end 37 of the plate 20. In another embodiment, the plate 20 may include a grooved portion 33 at least one side 35 of the plate, and/or at least one grooved portion 33 at a central region of the plate 20 extending from an inner end 36 of the plate toward an outer end 37 of the plate 20. The groove portion 33 is preferably provided with at least one through hole opening for a mounting member such as a bolt or the like.
The central region of the plate refers to a region of the plate 20 disposed between the sides 35 of the plate (the sides 35 are configured to be oriented toward the circumferentially adjacent plates 20), for example, at the center of the plate 20. The inner end 36 of the grate plate 20 refers to the end of the grate plate 20 that is configured to be oriented towards the center 12 of the cross-section of the grinding mill 2 when the grate plate 20 is mounted to the grinding mill 2. The outer end 37 of the grate plate 20 refers to the end of the grate plate 20 configured to be oriented towards the outer circumference of the grinding mill 2, or in other words, the end of the grate plate 20 remote from the center 12 of the cross-section of the grinding mill 2, when the grate plate 20 is mounted to the grinding mill 2.
According to one embodiment, both side portions 35 of a grid plate are configured to be oriented towards an adjacent grid plate, more particularly a circumferentially adjacent grid plate, both side portions 35 of a grid plate being provided with a groove portion 33 in the following manner: the grooved sections 33 of two adjacent plates are mounted side by side to form a grooved section 33 open towards the mill volume 28 side of the plate 20. Some examples of such embodiments are shown in fig. 7 and 9-13. According to other embodiments, at least one groove portion 33 may be integrally provided in one grate plate 20. Some examples of such embodiments are shown in fig. 14 and 15.
According to one embodiment, the at least one groove portion 33 has a cross-section in the shape of a U, a V, a cut V, a half U, a half V or a half cut V, when viewed from the end portions 36, 37 of the grid plate arranged between the side portions 35 of the grid plate 20. The U-shape and half-U-shape may be angled, such as in the embodiments of fig. 11, 15, 17, 18, and 19; or they may be circular, such as in the embodiment of fig. 14. The cutting of the cut V and of the semi-cut V can be carried out at both sides of the groove portion 33 configured to be oriented towards the exterior 34 of the grinding machine 2, in other words at the bottom of the "V", and at the sides of the groove portion 33 configured to be oriented towards the volume 28 of the grinding machine 2, in other words at the sides of the "V", as in the embodiment of fig. 13; or cut at only one side, in other words, only at the bottom of the "V" or only at the sides of the "V". The cross-section of the groove portion 33 and/or the blade 5 may vary as long as they are configured to fit into each other and the groove portion 33 is configured to open towards the volume 28 side of the grinding mill 2.
According to one embodiment, both side portions 35 of the grate plate 20 are configured to be oriented towards an adjacent grate plate 20, more particularly towards a circumferentially adjacent grate plate, both side portions 35 of the grate plate 20 are provided with a groove portion 33 of a half U-shape, a half V-shape or a half cut V-shape in the following manner: the groove portions 33 of two adjacent plates 20, which are half U-shaped, half V-shaped or half cut V-shaped, are mounted side by side so as to be configured to together form a U-shaped, V-shaped or cut V-shaped groove portion 33 open towards the volume 28 side of the grinding mill 2. Examples of such embodiments are shown in fig. 7, 9, 10, and 11-13.
According to one embodiment, the groove portion 33 may be provided as a recess in the grate plate 20. Examples of such embodiments are shown, for example, in fig. 7, 9, 10, and 11-19. According to another embodiment, the groove portion 33 may be formed by forming protrusions on both sides of the groove portion 33 instead of providing the notch in the grid plate 20 or in addition to providing the notch in the grid plate 20. Examples of such embodiments are shown in fig. 18 and 19. These protrusions may be provided as an integral part of the grate plate 20 (e.g. in the embodiment of fig. 18) or as separate protruding members 43 which may be fixedly or removably attached to the grate plate (as shown in the embodiment of fig. 19).
According to one embodiment, the blades 5 may be entirely disposed in the groove portion 33. According to another embodiment, only a part of the cross section of the blade 5 may be provided within the groove portion 33.
According to one embodiment, a portion of the lift bar 32 or wear bushing 39 may be disposed within the recessed portion 33.
According to one aspect, a grate support element 1 for an open mill 2 comprises: at least three blades 5 extending from the distal end of the grate support element, in other words the blades 5 extend from the outer periphery 6 of the grate support element 1 towards the central end of the grate support element 1, being directed towards the centre 12 of the cross-section of the open mill 2; and an inner part 4 connected with the blades 5 at the central end of the grate support element 1. Preferably, each blade 5 may be provided with at least one opening 19 for a mounting member when the grate plate 20 is mounted to the grate support element 1, the opening 19 being configured to align with the through-hole opening of at least one grate plate 20 according to the embodiments described in the present description and the accompanying drawings or combinations thereof.
According to one embodiment, in the grate support element 1 the blades 5 may be arranged at an angle 13 to the cross-sectional plane 7 of the open mill 2 in such a way that the central end (in other words, the inner part 4) of the grate support element 1 protrudes away from the mill volume 28 side of the grate support element 1.
According to one embodiment, the grate support element 1 may further comprise a peripheral portion 3, the peripheral portion 3 being connected with the blades 5 at the distal end of the grate support element 1.
According to one embodiment, one or more grate support elements 1 are configured to form a grate support structure 22.
According to one embodiment the inner part 4, which is connected with the blades 5 at the central end of the grate support element 1, is configured to form an annular inner circumference of the grate support element, as for example shown in the embodiments of fig. 3-6. According to another embodiment the inner part 4 connected with the blades 5 at the central end of the grate support element 1 is configured to form a solid circular central part of the grate support element 1.
According to one embodiment, the grate support structure 22 comprises an aperture 23 in a central portion of the grate support structure 22, the aperture 23 being defined by the inner portion 4 of the one or more grate support elements 1, more particularly by the inner periphery of the inner portion 4 being configured to form an annular inner periphery. According to one embodiment, the diameter of the holes 23 is in the range of 0% to 50% of the outer circumferential diameter 24 of the grate support structure 22.
According to one aspect, the device 40 at the discharge end of the mill comprises at least one grate plate 20 according to the embodiments described in the description or the figures or combinations of such embodiments thereof, and at least one grate support element 1 according to the embodiments described in the description or the figures or combinations of such embodiments thereof. More specifically, in such an arrangement, each grate support element vane 5 is preferably arranged in a grooved portion 33 of the grate plate 20, the grooved portion 33 of the grate plate 20 being at the mill volume 28 side of the grate plate 20, the openings 38, 19 in the grate plate 20 and the grate support element 1 being for mounting means, at least some of the openings 38, 19 being configured to be aligned (with each other) when the grate support element vane 5 is arranged in the grooved portion 33 of the grate plate 20, and the grate support element 1 being mounted to the grate plate 20 by means of mounting means arranged in the aligned openings 19, 38. Fig. 20 shows an exemplary embodiment of such an apparatus at the discharge end of a grinding mill.
According to one embodiment the arrangement comprises at least one wear bushing 39 or at least one lifting bar 32 mounted to at least one blade 5 of the grate support element 1. According to another embodiment, the wear bushing 39 or the lifting bar 21 comprises at least one opening 41 configured to be aligned with the at least one opening 19 of the grate support element when the wear bushing 39 or the lifting bar 32 is mounted to the grate support element 1, and the wear bushing 39 or the lifting bar 32 is mounted to the blades 4 of the grate support element 1 by the same mounting means as the mounting of the grate support element 1 to the grate plate 20.
According to one embodiment, the grate plate 20 is formed with a surface 42 that contacts the wear bushings 39 or the lift rods 32 mounted to the vanes 5 in a manner that creates a seamless wear surface. In this context, the seamless wear surface refers to the surface of the device 40 which is oriented towards the volume 28 of the grinding mill 2 and is therefore arranged to come into contact with the material to be ground and thus be worn.
Fig. 21 shows an embodiment of a method of dismantling the discharge end 10 of the grinding mill 2. The method of disassembling the discharge end 10 of the grinding mill 2 may include: removing 110 at least one grate plate 20 according to an embodiment or a combination of embodiments described in the present description and in the drawings from the outside 34 of the mill 2; and a removal 120 of at least one grate support element 1 according to an embodiment or a combination of embodiments described in the present description and drawings from the outside 34 of the grinding mill 2 after the removal of the grate plate 20 or simultaneously with the removal of the grate plate 20. In the embodiment where at least one grate plate 20 and at least one grate support element 1 are removed at the same time, it is possible to use as an example the way in which the grate plate 20 and the grate support element 1 are mounted to each other or they are fixedly attached to each other. The grate plate 20 and the grate support element 1 may be mounted to each other by means of e.g. mounting members.
According to one embodiment, the method further comprises removing at least one wear bushing 39 or at least one lifting bar 32 from the outside of the grinding mill 2 after removing the grate plate 20 or simultaneously with removing the grate plate 20. In embodiments where the at least one grate plate 20 and the at least one wear bushing 39 and/or the at least one lifting bar 32 are removed, this may be used as an example in such a way that the at least one grate plate 20 and the at least one wear bushing 39 and/or the at least one lifting bar 32 are mounted to each other, or they are fixedly attached to each other. The grate plate 20 and the wear bushings 39 and/or the lifting rods 32 may be mounted to each other by means of e.g. mounting members.
According to one embodiment, the grate support element 1 may be provided with mounting flanges 30 at the outer periphery 6 of the grate support element 1, the mounting flanges 30 being configured to mount the grate support element 1 to the housing of the grinding mill 2. In such embodiments, removing 120 the grate support element 1 may comprise: removing the mounting flange 30 of the grate support element 1 from the housing 11 of the grinding mill from the outside 34 of the grinding mill 2; and lifting the discharged grate support element 1 from the grinding mill 2. According to one embodiment, the mounting flange 30 may be provided as an integral part of the grate support element 1. According to another embodiment, the mounting flange 30 may be provided as a separate structural component and configured to be fixedly or removably connected to the grate support element.
Removing the grate plate 20, the grate support element 1, the wear bushings 39 and/or the lifting rods 32 from the grinding mill 2 means that the grate plate 20, the grate support element 1, the wear bushings 39 and/or the lifting rods 32 are lifted from their position in the grinding mill and lifted away for refurbishment, recycling or disposal.
According to one embodiment, the grate 25 of the grinding mill 2 may be formed of three to nine sections, wherein each section constitutes a section of the grate 25 in the range of 40 to 120 degrees of the grate. In other words, the grate of the mill 2 may be formed of three to nine such sections mounted circumferentially adjacent to each other, each inner portion 4 being oriented towards the centre 12 of the cross-section of the mill 2 to form a circular grate 25. Thus, in an embodiment, the grate 25 may for example comprise three sections, each section constituting a 120 degree section of the grate, in another embodiment the grate 25 may comprise four sections, each section constituting a 90 degree section of the grate, and so on. A benefit of such embodiments is that the plurality of sections 29 are lighter and easier to handle than embodiments where the grate is formed from one or two sections.
According to one embodiment, the method further comprises stopping the grinding mill 2 in such a position: this position allows the grate plate 20 to be removed to be positioned above the feed material before it is removed from the mill 2. For example, the grinding mill 2 may be stopped in a position where the grate plate to be removed is placed on top of the grate 25 or close to the top of the grate 25. A benefit of such an embodiment is that it is easier to replace the grate plate without completely stopping the process and there is no need to empty the slurry and ground material from the housing 11 for maintenance.
It is obvious to a person skilled in the art that with the advancement of technology, the inventive concept may be implemented in various ways. The invention and its embodiments are not limited to the examples described above but may vary within the scope of the claims.
Claims (16)
1. A grid plate for an open mill, the grid plate comprising:
a sector or a portion of a sector of a grate of the open mill; and
at least one groove portion configured to be opened toward a mill volume side of the grid plate when the grid plate is mounted on the mill;
wherein the groove portion is provided with at least one through hole opening for a mounting member.
2. The grid plate of claim 1 wherein the grid plate is configured to be oriented with the grooved portions disposed towards both sides of adjacent grid plates such that the grooved portions of two adjacent grid plates are mounted side by side to together form a grooved portion open towards the mill volume side of the grid plate.
3. The grid plate of claim 1, wherein at least one of the groove portions has a cross-section in a U-shape, a V-shape, a cut V-shape, a half U-shape, a half V-shape, or a half cut V-shape when viewed from an end portion of the grid plate disposed between both sides of the grid plate.
4. The grid plate of claim 3, wherein the grid plates configured to be oriented towards both sides of adjacent grid plates are provided with half U-, V-or V-shaped cut-off groove portions in such a way that the half U-, V-or V-shaped cut-off groove portions of two adjacent grid plates are mounted side by side to form together a U-, V-or V-shaped cut-off groove portion, respectively, open towards the mill volume side of the grid plate.
5. A grate support element for an open mill, characterized in that the grate support element comprises:
at least three vanes extending from the distal end of the grate support element towards the central end of the grate support element, oriented towards the centre of the cross-section of the open mill; and
an inner portion connected with the vanes at a central end of the grate support element;
wherein each blade is provided with at least one opening for a mounting member, said opening being configured to align with at least one of the through hole openings of the grate plate according to one of claims 1 to 4 when the grate plate is mounted on the grate support element.
6. The grate support element of claim 5, wherein the vanes are angled to the cross-sectional plane of the open mill in such a way that the central end of the grate support element protrudes away from the mill volume side of the grate support element.
7. The grate support element of claim 5, wherein the grate support element further comprises a peripheral portion connected to the vanes at a distal end of the grate support element.
8. The grate support element of claim 5, wherein one or more of the grate support elements are configured to form a grate support structure.
9. The grate support element of claim 5, wherein the inner portion of the grate support element connected to the vanes at the central end is configured to form an annular inner circumference of the grate support element.
10. The grate support element of claim 5, wherein the inner portion of the grate support element connected to the vanes at the central end is configured to form a solid circular center portion of the grate support element.
11. An apparatus at the discharge end of a grinding mill, the apparatus comprising:
at least one grate plate according to any one of claims 1 to 4; and
at least one grate support element according to any of the claims 5-10;
wherein each grate support element blade is arranged in a recessed portion of the grate plate on the mill volume side of the grate plate,
wherein at least some of the openings for mounting members in the grate plate and the grate support element are configured to be aligned when the grate support element vanes are disposed in the recessed portion of the grate plate, and wherein
Wherein the grate support element is mounted to the grate plate by means of mounting members arranged in the aligned openings.
12. The apparatus of claim 11, wherein the apparatus further comprises:
at least one wear bushing or at least one lifting bar mounted to at least one blade of the grate support element.
13. The apparatus of claim 12, wherein,
the wear bushing or the lifting bar comprises at least one opening configured to align with at least one opening of the grate support element when the wear bushing or the lifting bar is mounted to the grate support element, and wherein
The wear bushings or the lifting rods are mounted to the blades of the grate support element by the same mounting means that mount the grate support element to the grate plate.
14. The apparatus of claim 12 wherein the grate plate forms a surface that contacts the wear bushings or the lift rods mounted to the one or more vanes in a manner that forms a seamless wear surface.
15. A method for disassembling a discharge end of a grinding mill, the method comprising:
removing at least one grate plate according to any of claims 1-4 from the outside of the mill; and
removing at least one grate support element according to any of the claims 5-10 from the outside of the mill after or simultaneously with the removal of the grate plate.
16. The method of claim 15, wherein the method further comprises:
removing at least one wear bushing or at least one lifting bar from the outside of the mill after or while removing the grate plate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/FI2019/050927 WO2021136864A1 (en) | 2019-12-30 | 2019-12-30 | Grate panel, grate panel support element, arrangement at grinding mill discharge end and method for disassembling discharge end of grinding mill |
| FIPCT/FI2019/050927 | 2019-12-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113117870A true CN113117870A (en) | 2021-07-16 |
| CN113117870B CN113117870B (en) | 2024-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011590525.7A Active CN113117870B (en) | 2019-12-30 | 2020-12-29 | Grate plate and supporting element thereof, device at discharge end of grinder and disassembling method of device |
| CN202023248023.4U Active CN215541619U (en) | 2019-12-30 | 2020-12-29 | Grate plate, grate plate support element and device at the discharge end of a grinding mill |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023248023.4U Active CN215541619U (en) | 2019-12-30 | 2020-12-29 | Grate plate, grate plate support element and device at the discharge end of a grinding mill |
Country Status (2)
| Country | Link |
|---|---|
| CN (2) | CN113117870B (en) |
| WO (1) | WO2021136864A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021136864A1 (en) * | 2019-12-30 | 2021-07-08 | Metso Outotec Finland Oy | Grate panel, grate panel support element, arrangement at grinding mill discharge end and method for disassembling discharge end of grinding mill |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3219284A (en) * | 1962-06-15 | 1965-11-23 | Bolidens Gruv Ab | Screening device in a rotatable drum intended for grinding and/or mixing material |
| US3599882A (en) * | 1970-01-08 | 1971-08-17 | Allis Chalmers Mfg Co | Discharge diaphragm assembly for grinding mill or the like |
| US3894696A (en) * | 1972-08-02 | 1975-07-15 | Skega Ab | Device at grate means mounted in a mill or another processing apparatus |
| AU557151B2 (en) * | 1981-11-11 | 1986-12-11 | Thyer Rubber Co. Pty. Ltd. | Modular grate |
| CN207446386U (en) * | 2017-08-29 | 2018-06-05 | 南京西普水泥工程集团有限公司 | A kind of anti-blocking grate plate |
| CN110237902A (en) * | 2019-05-29 | 2019-09-17 | 新疆大明矿业集团股份有限公司 | The grate ball mill of grinding capacity can be improved |
| CN215541619U (en) * | 2019-12-30 | 2022-01-18 | 奥图泰(芬兰)公司 | Grate plate, grate plate support element and device at the discharge end of a grinding mill |
-
2019
- 2019-12-30 WO PCT/FI2019/050927 patent/WO2021136864A1/en active Application Filing
-
2020
- 2020-12-29 CN CN202011590525.7A patent/CN113117870B/en active Active
- 2020-12-29 CN CN202023248023.4U patent/CN215541619U/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3219284A (en) * | 1962-06-15 | 1965-11-23 | Bolidens Gruv Ab | Screening device in a rotatable drum intended for grinding and/or mixing material |
| US3599882A (en) * | 1970-01-08 | 1971-08-17 | Allis Chalmers Mfg Co | Discharge diaphragm assembly for grinding mill or the like |
| US3894696A (en) * | 1972-08-02 | 1975-07-15 | Skega Ab | Device at grate means mounted in a mill or another processing apparatus |
| AU557151B2 (en) * | 1981-11-11 | 1986-12-11 | Thyer Rubber Co. Pty. Ltd. | Modular grate |
| CN207446386U (en) * | 2017-08-29 | 2018-06-05 | 南京西普水泥工程集团有限公司 | A kind of anti-blocking grate plate |
| CN110237902A (en) * | 2019-05-29 | 2019-09-17 | 新疆大明矿业集团股份有限公司 | The grate ball mill of grinding capacity can be improved |
| CN215541619U (en) * | 2019-12-30 | 2022-01-18 | 奥图泰(芬兰)公司 | Grate plate, grate plate support element and device at the discharge end of a grinding mill |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021136864A1 (en) | 2021-07-08 |
| CN113117870B (en) | 2024-05-28 |
| CN215541619U (en) | 2022-01-18 |
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