WO2015166139A1 - A method and an arrangement for providing power to a sensor arrangement on a tube mill - Google Patents
A method and an arrangement for providing power to a sensor arrangement on a tube mill Download PDFInfo
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- WO2015166139A1 WO2015166139A1 PCT/FI2015/050287 FI2015050287W WO2015166139A1 WO 2015166139 A1 WO2015166139 A1 WO 2015166139A1 FI 2015050287 W FI2015050287 W FI 2015050287W WO 2015166139 A1 WO2015166139 A1 WO 2015166139A1
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- coil element
- grinding mill
- arrangement
- metallurgical
- transmitting
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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
- B02C17/1805—Monitoring devices for tumbling mills
Definitions
- the present invention relates to the field of mineral and metallurgical processes, to disintegrating in general and to disintegrating by tumbling mills, and more particularly to a method and arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill, and to a sensor arrangement on a large rotating mineral and metallurgical grinding mill.
- the processes concerned are preceded by comminution processing i.e. mechanical crushing, grinding or disintegration of the material in a manner to liberate the valuable components.
- comminution processing i.e. mechanical crushing, grinding or disintegration of the material in a manner to liberate the valuable components.
- concentration methods i.e. flotation, gravimetric separation, magnetic separation, this isolation being contingent on differences in color, shape, density or in differences in their respective surface active and magnetic properties, or other properties.
- Comminution is particle size reduction of materials. Comminution is achieved by blasting, crushing and grinding. In comminution processing first ore or rock is excavated, broken down or removed by blasting. Blasting is the controlled use of explosives and other methods in mining, quarrying and civil engineering. Typically blasting produces particles in the size having a diameter of 500 mm or more.
- Crushing is particle size reduction of ore or rock materials by using crushing devices i.e. crushers.
- Crushers e.g. jaw crushers, gyratory crushers or cone crushers are used to reduce the size, or change the form, of materials so that pieces of different composition can be differentiated.
- the crushing devices hold material being crushed between two parallel or tangent solid surfaces of a stronger material and apply sufficient force to bring said surfaces together.
- particles having a diameter up to 1000 mm are crushed to particles having a diameter of 5 mm or more.
- Grinding is particle size reduction of ore or rock materials in grinding mills.
- the demands for rotating mineral and metallurgical grinding mills are very high both in terms of grinding efficiency and energy consumption.
- particles having a diameter up to 1000 mm are grinded to particles having a diameter of 0,010 mm or more.
- This conventional grinding of materials results in considerable wear on the grinding bodies present in the mill, due to the hardness of the rock concerned, therewith also resulting in considerable costs for the provision of such grinding bodies.
- the rotating mineral and metallurgical grinding mills are typically very large, having a diameter of several meters.
- the grinding mills may be trunnion-supported or shell-supported.
- Trunnion support is the most common way of supporting a mill in a mineral processing application, especially in very large grinding mills.
- the support bearings In a bearing arrangement of a trunnion-supported grinding mill the support bearings have a relatively small bearing diameter and the trunnion journals have a high consistent stiff journal surfaces, this facilitating the formation of a good bearing lubricant film distribution.
- the shell-supported grinding mills are more compact, occupy less floor space and require simpler foundations than comparable trunnion-supported grinding mills. Because the end plates of the shell-supported grinding mill do not support the structure, the feed and discharge openings may be sized to meet process conditions without being constrained by trunnion bearing limitations.
- a ball mill is a typical type of fine grinder.
- the rotating mineral and metallurgical grinding mills are today very often autogenous grinding mills or semi-autogenous grinding mills designed for grinding or primary crushed ore.
- Autogenous grinding mills are so-called due to the self-grinding of the ore.
- a rotating drum throws larger rocks of ore in a cascading motion which causes impact breakage of larger rocks and compressive grinding of finer particles.
- the actual material itself i.e. the material to be ground, forms the grinding bodies.
- Semi-autogenous grinding mills are similar to autogenous mills, but utilize grinding balls e.g. steel grinding balls to aid in grinding like in a ball mill. Attrition between grinding balls and ore particles causes grinding of finer parti- cles. Semi-autogenous grinding mills typically use a grinding ball charge of 8 to 21 %, sometimes a grinding ball charge of 5 to 60%. A semi-autogenous grinding mill is generally used as a primary or first stage grinding solution. Semi- autogenous grinding mills are primarily used at gold, copper and platinum mines with applications also in the lead, zinc, silver, alumina and nickel industries.
- Autogenous and semi-autogenous grinding mills are typically characterized by their large diameter and short length as compared to ball mills.
- the rotating mineral and metallurgical grinding mills such as autogenous and semi-autogenous grinding mills are typically driven by ring gears, with a 360° fully enclosing guard.
- the large rotating mineral and metallurgical grinding mill is usually operated in an environment having a lot of dust and dirt as well as noise vibra- tion and moisture, all these elements contributing to the challenges in the measurements carried by the on-apparatus type of sensor arrangement.
- Fur- thermore on shell measurement apparatus requires continuing maintenance free and reliable power supply in order to function properly.
- a typical grinding mill is operating 365 days per year with only few maintenance breaks therefore the power supply and measurement apparatus needs to be practically mainte- nance free and design for high availability.
- Figure 1 shows a perspective view of a prior art sensor arrangement on a large rotating mineral and metallurgical grinding mill.
- FIG. 1 shows a perspective view of a prior art sensor arrangement on a large rotating mineral and metallurgical grinding mill.
- the presented prior art grinding mill has a drum shell surface marked with a reference number 1 .
- On the grinding mill drum shell surface 1 there is arranged a sensor arrangement 2 according to the prior art.
- the sensor arrangement 2 according to the prior art arranged on the grinding mill drum shell surface 1 is powered by ex- ternal batteries 3, 4 arranged on the grinding mill drum shell surface 1 .
- the external batteries 3, 4 provide power to the sensor arrangement 2 according to the prior art.
- the problem therefore is to find a solution for providing power to a sensor arrangement on large rotating mineral and metallurgical grinding mill which can provide power reliably for the entire runtime of the large rotating mineral and metallurgical grinding mill.
- a method for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill which method would provide power more reliably and more durable when compared to the prior art solutions.
- an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill which arrangement would be more reliable and and more durable when compared to the prior art solutions; and also a demand for a sensor arrangement on a large rotating mineral and metallurgical grinding mill having such characteristics.
- An object of the present invention is thus to provide a method and an apparatus for implementing the method so as to overcome the above problems and to alleviate the above disadvantages.
- the objects of the invention are achieved by a method for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill which method comprises the steps of:
- said at least one receiving coil element is arranged on a portion of the entire shell surface around the rotating mineral and metallurgical grinding mill.
- said at least one receiving coil element for receiving inductive charge is arranged on the entire shell surface around the rotating mineral and metallurgical grinding mill.
- transmitting unit arranged outside said large rotating mineral and metallurgical grinding mill, said transmitting unit having at least one transmitting coil element for creating an alternating electromagnetic field to said at least one transmitting coil element for transmitting inductive charge to an at least one receiving coil element;
- an at least one receiving coil element for taking power by receiving inductive charge, said at least one receiving coil element being arranged at the shell surface of said large rotating mineral and metallurgical grinding mill;
- said at least one transmitting coil element of said transmitting unit is arranged close to the said at least one receiving coil element at the shell surface of said large rotating mineral and metallurgical grinding mill.
- said at least one receiving coil element comprises one receiving coil element.
- said at least one receiving coil element comprises several receiving coil elements.
- said at least one receiving coil element is arranged on a portion of the entire shell surface around the rotating mineral and metallurgical grinding mill.
- said at least one receiving coil element for receiving inductive charge is arranged on the entire shell surface around the rotating mineral and metallurgical grinding mill.
- said at least one receiving coil element is arranged on one end of said shell surface.
- said at least one transmitting coil element and/or the transmitting unit is/are installed at the drum bearing housing.
- said at least one transmitting coil element of said transmitting unit comprises one transmitting coil element.
- said at least one transmitting coil element of said transmitting unit comprises several transmitting coil elements.
- said arrangement comprises an external power unit coupled to said transmitting unit.
- said arrangement provides power to a sensor arrangement on a large grinding mill drum.
- Figure 1 shows a perspective view of a prior art sensor arrangement on a large rotating mineral and metallurgical grinding mill
- Figure 2 shows a perspective view of a grinding mill drum having one embodiment of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention
- Figure 3 shows a perspective view of a grinding mill drum having another embodiment of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention
- Figure 4 shows one embodiment of a transmitting unit of an ar- rangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention
- Figure 5 shows another embodiment of a transmitting unit of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention
- Figure 6 shows a side view of a large rotating mineral and metallurgical grinding mill having an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention
- Figure 7 shows a perspective view of a grinding mill drum having a third embodiment of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention.
- the present invention relates to a method and an arrangement for providing power to a sensor arrangement on a large rotating mineral and met- allurgical grinding mill.
- the presented arrangement for providing power to a sensor arrangement comprises at least one receiving coil element for receiving inductive charge, said at least one receiving coil element being arranged at the shell surface of the large rotating mineral and met- allurgical grinding mill; and a transmitting unit being arranged outside said large rotating mineral and metallurgical grinding mill, said transmitting unit having at least one transmitting coil element for transmitting inductive charge to said at least one receiving coil element, said at least one transmitting coil element of said transmitting unit being arranged close to the said at least one re- DCving coil element at the shell surface of the large rotating mineral and metallurgical grinding mill.
- FIG. 2 shows a perspective view of a grinding mill drum having one embodiment of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention.
- the presented grinding mill has a drum shell surface marked with a reference number 5.
- a sensor arrangement 6 according to the present invention.
- the presented embodiment of an arrangement for providing power to a sensor arrangement comprises one receiving coil element 7 for receiving inductive charge, said receiving coil element 7 being arranged on the grinding mill drum shell surface 5.
- the receiving coil element 7 on the grinding mill drum shell surface 5 is arranged for receiving inductive charge from an at least one transmitting coil element arranged outside said large rotating mineral and metallurgical grinding mill.
- FIG. 3 shows a perspective view of a grinding mill drum having another embodiment of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention.
- the presented grinding mill has a drum shell surface marked with a reference number 5.
- a sensor arrangement 6 according to the present invention.
- the presented another embodiment of an arrangement for providing power to a sensor arrangement according to the present invention comprises several receiving coil elements 8-1 1 for receiving inductive charge, said receiving coil elements 8-1 1 being arranged on the grinding mill drum shell surface 5.
- the receiving coil elements 8-1 1 on the grinding mill drum shell surface 5 are arranged for receiving inductive charge from an at least one transmitting coil element arranged outside said large rotating mineral and metallurgical grinding mill.
- the presented at least one receiving coil element 7-1 1 for receiving inductive charge may be arranged on the entire shell surface 5 around the rotating mineral and metallurgical grinding mill, or arranged only on a portion of the entire shell surface 5 around the rotating mineral and metallurgical grinding mill.
- Figure 4 shows one embodiment of a transmitting unit of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention.
- the presented embodiment of a transmitting unit of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention is marked with a reference number 12.
- the transmitting unit 12 comprises one transmitting coil element 13 for transmitting inductive charge to said at least one receiving coil element being arranged at the shell surface of the large rotating mineral and metallurgical grinding mill.
- Figure 5 shows another embodiment of a transmitting unit of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention.
- the presented another embodiment of a transmitting unit of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention is marked with a reference number 14.
- the transmitting unit 14 comprises several transmitting coil elements 15-18 for transmitting inductive charge to said at least one receiving coil element being arranged at the shell surface of the large rotating mineral and metallurgical grinding mill.
- Figure 6 shows a side view of a large rotating mineral and metallurgical grinding mill having an arrangement for providing power to a sensor ar- rangement on a large rotating mineral and metallurgical grinding mill according to the present invention.
- the large rotating mineral and metallurgical grinding mill shown in Figure 6 has a shell surface marked with a reference number 19. On said apparatus shell surface 19 there is arranged a sensor arrangement 20 according to the present invention.
- the presented arrangement for providing power to the said sensor arrangement 20 comprises at least one receiving coil element 21 for receiving inductive charge, said at least one receiving coil element 21 being arranged on the apparatus shell surface 19; and a transmitting unit 22 for transmitting inductive charge, said transmitting unit 22 being arranged outside said large ro- tating mineral and metallurgical grinding mill and having at least one transmitting coil element for transmitting inductive charge to said at least one receiving coil element 21 .
- the presented arrangement for providing power to the said sensor arrangement 20 may also comprise an external power unit 23 coupled to said transmitting unit 22.
- the at least one receiving coil element 21 on the apparatus shell surface 19 are arranged for receiving inductive charge from an at least one transmitting coil element arranged outside said large rotating mineral and metallurgical grinding mill. Respectively the at least one transmitting coil element of said transmitting unit 22 are arranged for transmitting inductive charge to said at least one receiving coil element 21 . Furthermore, the at least one transmitting coil element of said transmitting unit 22 are arranged close to the said at least one receiving coil element 21 at the shell surface of the large rotating mineral and metallurgical grinding mill.
- the arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill provides power to the sensor arrangement 20 on the apparatus shell surface 19 using a specific induction charging apparatus.
- Inductive charging uses an electromagnetic field to transfer energy between the at least one transmitting coil element of said transmitting unit 22 and the at least one receiving coil element 21 . Energy is transferred through an inductive coupling to the at least one receiving coil element 21 , which can then use that energy to function and to charge batteries.
- an alternating electromagnetic field is created to the at least one transmitting coil element of said transmitting unit 22, and the at least one receiving coil element 21 in the large rotating min- eral and metallurgical grinding mill takes power from the electromagnetic field and converts said power back into electrical current for functioning and for charging the batteries of said sensor arrangement 20.
- Greater distances between the at least one transmitting coil element of said transmitting unit 22 and the at least one receiving coil element 21 can be used when the inductive charging system uses resonant inductive coupling.
- the inductive power transfer is done either over the whole rotation cycle of the large rotating mineral and metallurgical grinding mill or during a portion of said rotation cycle.
- Figure 7 shows a perspective view of a grinding mill drum having a third embodiment of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention.
- the presented grinding mill has a drum shell surface marked with a reference number 5.
- a sensor arrangement 25 On one end 24 of the grinding mill drum shell surface 5 there is arranged a sensor arrangement 25 according to the present invention.
- the presented third embodiment of an arrangement for providing power to a sensor arrangement according to the present invention also comprises one receiving coil element 26 for receiving inductive charge, said receiving coil element 26 being arranged on one end 24 of the grinding mill drum shell surface 5.
- the receiving coil element 26 on one end 24 of the grinding mill drum shell surface 5 is arranged for receiving inductive charge from an at least one transmitting coil element arranged outside said large rotating mineral and metallurgical grinding mill.
- Said at least one transmitting coil element and/or the transmitting unit can be installed at the drum bearing housing.
- the solution according to the present invention provides power to the sensor arrangement on large rotating mineral and metallurgical grinding mill sufficiently and reliably and for the entire runtime of the large rotating mineral and metallurgical grinding mill.
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Abstract
The present invention relates to the field of mineral and metallurgical processes, and more particularly to a method and arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill, and to a sensor arrangement on a large rotating mineral and metallurgical grinding mill. An arrangement for providing power to a sensor arrangement (6), (20), (25) according to the present invention has a transmitting unit (12), (14), (22) arranged outside said large rotating mineral and metallurgical grinding mill, said transmitting unit (12), (14), (22) having at least one transmitting coil element (13), (15-18) for creating an alternating electromagnetic field to said at least one transmitting coil element (13), (15-18) for transmitting inductive charge to an at least one receiving coil element (7-11), (21), (26); and an at least one receiving coil element (7-11), (21), (26) for taking power by receiving inductive charge, said at least one receiving coil element (7-11), (21), (26) being arranged at the shell surface (5), (19), (24) of said large rotating mineral and metallurgical grinding mill, wherein said at least one transmitting coil element (13), (15-18) of said transmitting unit (12), (14), (22) is arranged close to the said at least one receiving coil element (7-11), (21), (26) at the shell surface (5), (19), (24) of said large rotating mineral and metallurgical grinding mill.
Description
A METHOD AND AN ARRANGEMENT FOR PROVIDING POWER TO A SENSOR ARRANGEMENT ON A TUBE MILL
FIELD OF THE INVENTION
The present invention relates to the field of mineral and metallurgical processes, to disintegrating in general and to disintegrating by tumbling mills, and more particularly to a method and arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill, and to a sensor arrangement on a large rotating mineral and metallurgical grinding mill.
BACKGROUND OF THE INVENTION
One of the most common processes in mining and metallurgy is the comminution processing or disintegrating of ore.
When processing mineral material for the selective or collective recovery of valuable material components, the processes concerned are preceded by comminution processing i.e. mechanical crushing, grinding or disintegration of the material in a manner to liberate the valuable components. After the comminution the valuable components are concentrated with the aid of known concentration methods i.e. flotation, gravimetric separation, magnetic separation, this isolation being contingent on differences in color, shape, density or in differences in their respective surface active and magnetic properties, or other properties.
Comminution is particle size reduction of materials. Comminution is achieved by blasting, crushing and grinding. In comminution processing first ore or rock is excavated, broken down or removed by blasting. Blasting is the controlled use of explosives and other methods in mining, quarrying and civil engineering. Typically blasting produces particles in the size having a diameter of 500 mm or more.
Crushing is particle size reduction of ore or rock materials by using crushing devices i.e. crushers. Crushers e.g. jaw crushers, gyratory crushers or cone crushers are used to reduce the size, or change the form, of materials so that pieces of different composition can be differentiated. In the crushing process the crushing devices hold material being crushed between two parallel or tangent solid surfaces of a stronger material and apply sufficient force to
bring said surfaces together. Typically in a crushing process particles having a diameter up to 1000 mm are crushed to particles having a diameter of 5 mm or more.
Grinding is particle size reduction of ore or rock materials in grinding mills. In mining and industrial mineral operations the demands for rotating mineral and metallurgical grinding mills are very high both in terms of grinding efficiency and energy consumption. Typically in a grinding process particles having a diameter up to 1000 mm are grinded to particles having a diameter of 0,010 mm or more. This conventional grinding of materials, however, results in considerable wear on the grinding bodies present in the mill, due to the hardness of the rock concerned, therewith also resulting in considerable costs for the provision of such grinding bodies.
The rotating mineral and metallurgical grinding mills are typically very large, having a diameter of several meters. The grinding mills may be trunnion-supported or shell-supported. Trunnion support is the most common way of supporting a mill in a mineral processing application, especially in very large grinding mills. In a bearing arrangement of a trunnion-supported grinding mill the support bearings have a relatively small bearing diameter and the trunnion journals have a high consistent stiff journal surfaces, this facilitating the formation of a good bearing lubricant film distribution. The shell-supported grinding mills are more compact, occupy less floor space and require simpler foundations than comparable trunnion-supported grinding mills. Because the end plates of the shell-supported grinding mill do not support the structure, the feed and discharge openings may be sized to meet process conditions without being constrained by trunnion bearing limitations.
A ball mill is a typical type of fine grinder. However, the rotating mineral and metallurgical grinding mills are today very often autogenous grinding mills or semi-autogenous grinding mills designed for grinding or primary crushed ore. Autogenous grinding mills are so-called due to the self-grinding of the ore. In an autogenous grinding mill a rotating drum throws larger rocks of ore in a cascading motion which causes impact breakage of larger rocks and compressive grinding of finer particles. In autogenous grinding the actual material itself, i.e. the material to be ground, forms the grinding bodies.
Semi-autogenous grinding mills are similar to autogenous mills, but utilize grinding balls e.g. steel grinding balls to aid in grinding like in a ball mill. Attrition between grinding balls and ore particles causes grinding of finer parti-
cles. Semi-autogenous grinding mills typically use a grinding ball charge of 8 to 21 %, sometimes a grinding ball charge of 5 to 60%. A semi-autogenous grinding mill is generally used as a primary or first stage grinding solution. Semi- autogenous grinding mills are primarily used at gold, copper and platinum mines with applications also in the lead, zinc, silver, alumina and nickel industries.
Autogenous and semi-autogenous grinding mills are typically characterized by their large diameter and short length as compared to ball mills. The rotating mineral and metallurgical grinding mills such as autogenous and semi-autogenous grinding mills are typically driven by ring gears, with a 360° fully enclosing guard.
Large rotating mineral and metallurgical grinding mill is typically difficult to control. In order to monitor and control the process and the large rotating mineral and metallurgical grinding mill one requires several sensor ar- rangements for providing measured process data for monitoring and controlling. Previously such process data was provided by off-apparatus sensor arrangements arranged on the side of the device on the surrounding structure.
The proper controlling of a large rotating mineral and metallurgical grinding mill is very important in order to acquire a well-controlled process, this further resulting to a better yield and less waste of resources and energy. This proper controlling can only be reached with proper measurement arrangement providing measured process data for monitoring and controlling.
Over the recent years there has also been a lot of development around on-apparatus type of sensor arrangements. There are systems that are based on acoustic sensor or a vibration sensor on the mill shell. For example, in patent document US 6,874,364 a system for monitoring mechanical waves from a moving machine has been presented in which system a sensor arrangement is located on an exterior surface of the grinding mill drum. Also in patent document US 5,360,174 an arrangement for registering the instant grinding charge volume of a grinding drum has been presented in which arrangement there is integrated a tension sensor on a flexible bar inside a rubber or steel-cap lifter bar of the grinding mill drum.
The large rotating mineral and metallurgical grinding mill is usually operated in an environment having a lot of dust and dirt as well as noise vibra- tion and moisture, all these elements contributing to the challenges in the measurements carried by the on-apparatus type of sensor arrangement. Fur-
thermore on shell measurement apparatus requires continuing maintenance free and reliable power supply in order to function properly. A typical grinding mill is operating 365 days per year with only few maintenance breaks therefore the power supply and measurement apparatus needs to be practically mainte- nance free and design for high availability.
In the following, the prior art will be described with reference to the accompanying Figure 1 , which shows a perspective view of a prior art sensor arrangement on a large rotating mineral and metallurgical grinding mill.
Figure 1 shows a perspective view of a prior art sensor arrangement on a large rotating mineral and metallurgical grinding mill. The presented prior art grinding mill has a drum shell surface marked with a reference number 1 . On the grinding mill drum shell surface 1 there is arranged a sensor arrangement 2 according to the prior art. The sensor arrangement 2 according to the prior art arranged on the grinding mill drum shell surface 1 is powered by ex- ternal batteries 3, 4 arranged on the grinding mill drum shell surface 1 . The external batteries 3, 4 provide power to the sensor arrangement 2 according to the prior art.
However, many of the above presented type of sensor arrangements are not in use in large rotating mineral and metallurgical grinding mills. The problem with the current prior art on-apparatus type of sensor arrangements is to provide a constant, reliable and maintenance free power source to the said on-apparatus sensor arrangement over the full life of the apparatus. Several types of dynamo systems have been tried out, but none of those have been adequately successful. Usage of batteries or similar types of devices is not practical in large rotating mineral and metallurgical grinding mills due to maintenance, safety and power requirement issues.
In general, there are some problems with the prior art solutions for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill. So far, the prior art solutions for providing power to a sensor arrangement are insufficient and do not provide power reliably for the entire runtime of the large rotating mineral and metallurgical grinding mill.
The problem therefore is to find a solution for providing power to a sensor arrangement on large rotating mineral and metallurgical grinding mill which can provide power reliably for the entire runtime of the large rotating mineral and metallurgical grinding mill.
There is a demand in the market for a method for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill which method would provide power more reliably and more durable when compared to the prior art solutions. Likewise, there is a demand in the market for an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill, which arrangement would be more reliable and and more durable when compared to the prior art solutions; and also a demand for a sensor arrangement on a large rotating mineral and metallurgical grinding mill having such characteristics. BRIEF DESCRIPTION OF THE INVENTION
An object of the present invention is thus to provide a method and an apparatus for implementing the method so as to overcome the above problems and to alleviate the above disadvantages.
The objects of the invention are achieved by a method for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill which method comprises the steps of:
- creating an alternating electromagnetic field to an at least one transmitting coil element of a transmitting unit arranged outside said large rotating mineral and metallurgical grinding mill; and
- taking power by receiving inductive charge from said alternating electromagnetic field by at least one receiving coil element arranged at the shell surface of said large rotating mineral and metallurgical grinding mill, and
- converting said power back into electrical current for functioning and for charging the batteries or other electrical storage device of said sensor arrangement.
Preferably, in the step of taking power by receiving inductive charge from said alternating electromagnetic field, said at least one receiving coil element is arranged on a portion of the entire shell surface around the rotating mineral and metallurgical grinding mill. Alternatively, in the step of taking power by receiving inductive charge from said alternating electromagnetic field, said at least one receiving coil element for receiving inductive charge is arranged on the entire shell surface around the rotating mineral and metallurgical grinding mill.
Furthermore, the objects of the invention are achieved by an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill, said arrangement comprising:
- a transmitting unit arranged outside said large rotating mineral and metallurgical grinding mill, said transmitting unit having at least one transmitting coil element for creating an alternating electromagnetic field to said at least one transmitting coil element for transmitting inductive charge to an at least one receiving coil element; and
- an at least one receiving coil element for taking power by receiving inductive charge, said at least one receiving coil element being arranged at the shell surface of said large rotating mineral and metallurgical grinding mill;
wherein said at least one transmitting coil element of said transmitting unit is arranged close to the said at least one receiving coil element at the shell surface of said large rotating mineral and metallurgical grinding mill.
Preferably, said at least one receiving coil element comprises one receiving coil element. Alternatively, said at least one receiving coil element comprises several receiving coil elements.
Preferably, said at least one receiving coil element is arranged on a portion of the entire shell surface around the rotating mineral and metallurgical grinding mill. Alternatively, said at least one receiving coil element for receiving inductive charge is arranged on the entire shell surface around the rotating mineral and metallurgical grinding mill. Further alternatively, said at least one receiving coil element is arranged on one end of said shell surface. Further preferably, said at least one transmitting coil element and/or the transmitting unit is/are installed at the drum bearing housing.
Preferably, said at least one transmitting coil element of said transmitting unit comprises one transmitting coil element. Alternatively, said at least one transmitting coil element of said transmitting unit comprises several transmitting coil elements.
Preferably, said arrangement comprises an external power unit coupled to said transmitting unit. Preferably, said arrangement provides power to a sensor arrangement on a large grinding mill drum.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows a perspective view of a prior art sensor arrangement on a large rotating mineral and metallurgical grinding mill;
Figure 2 shows a perspective view of a grinding mill drum having one embodiment of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention;
Figure 3 shows a perspective view of a grinding mill drum having another embodiment of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention;
Figure 4 shows one embodiment of a transmitting unit of an ar- rangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention;
Figure 5 shows another embodiment of a transmitting unit of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention;
Figure 6 shows a side view of a large rotating mineral and metallurgical grinding mill having an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention;
Figure 7 shows a perspective view of a grinding mill drum having a third embodiment of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention.
The prior art drawing of Figure 1 has been presented earlier. In the following, the invention will be described in greater detail by means of pre- ferred embodiments with reference to the accompanying drawings of Figures 2 to 7.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a method and an arrangement for providing power to a sensor arrangement on a large rotating mineral and met- allurgical grinding mill.
The presented arrangement for providing power to a sensor arrangement according to the present invention comprises at least one receiving coil element for receiving inductive charge, said at least one receiving coil element being arranged at the shell surface of the large rotating mineral and met- allurgical grinding mill; and a transmitting unit being arranged outside said
large rotating mineral and metallurgical grinding mill, said transmitting unit having at least one transmitting coil element for transmitting inductive charge to said at least one receiving coil element, said at least one transmitting coil element of said transmitting unit being arranged close to the said at least one re- ceiving coil element at the shell surface of the large rotating mineral and metallurgical grinding mill.
Figure 2 shows a perspective view of a grinding mill drum having one embodiment of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention. The presented grinding mill has a drum shell surface marked with a reference number 5. On the grinding mill drum shell surface 5 there is arranged a sensor arrangement 6 according to the present invention.
The presented embodiment of an arrangement for providing power to a sensor arrangement according to the present invention comprises one receiving coil element 7 for receiving inductive charge, said receiving coil element 7 being arranged on the grinding mill drum shell surface 5. The receiving coil element 7 on the grinding mill drum shell surface 5 is arranged for receiving inductive charge from an at least one transmitting coil element arranged outside said large rotating mineral and metallurgical grinding mill.
Figure 3 shows a perspective view of a grinding mill drum having another embodiment of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention. The presented grinding mill has a drum shell surface marked with a reference number 5. On the grinding mill drum shell surface 5 there is arranged a sensor arrangement 6 according to the present invention.
The presented another embodiment of an arrangement for providing power to a sensor arrangement according to the present invention comprises several receiving coil elements 8-1 1 for receiving inductive charge, said receiving coil elements 8-1 1 being arranged on the grinding mill drum shell surface 5. The receiving coil elements 8-1 1 on the grinding mill drum shell surface 5 are arranged for receiving inductive charge from an at least one transmitting coil element arranged outside said large rotating mineral and metallurgical grinding mill.
The presented at least one receiving coil element 7-1 1 for receiving inductive charge may be arranged on the entire shell surface 5 around the rotating mineral and metallurgical grinding mill, or arranged only on a portion of
the entire shell surface 5 around the rotating mineral and metallurgical grinding mill.
Figure 4 shows one embodiment of a transmitting unit of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention. The presented embodiment of a transmitting unit of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention is marked with a reference number 12. The transmitting unit 12 comprises one transmitting coil element 13 for transmitting inductive charge to said at least one receiving coil element being arranged at the shell surface of the large rotating mineral and metallurgical grinding mill.
Figure 5 shows another embodiment of a transmitting unit of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention. The presented another embodiment of a transmitting unit of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention is marked with a reference number 14. The transmitting unit 14 comprises several transmitting coil elements 15-18 for transmitting inductive charge to said at least one receiving coil element being arranged at the shell surface of the large rotating mineral and metallurgical grinding mill.
Figure 6 shows a side view of a large rotating mineral and metallurgical grinding mill having an arrangement for providing power to a sensor ar- rangement on a large rotating mineral and metallurgical grinding mill according to the present invention. The large rotating mineral and metallurgical grinding mill shown in Figure 6 has a shell surface marked with a reference number 19. On said apparatus shell surface 19 there is arranged a sensor arrangement 20 according to the present invention.
The presented arrangement for providing power to the said sensor arrangement 20 comprises at least one receiving coil element 21 for receiving inductive charge, said at least one receiving coil element 21 being arranged on the apparatus shell surface 19; and a transmitting unit 22 for transmitting inductive charge, said transmitting unit 22 being arranged outside said large ro- tating mineral and metallurgical grinding mill and having at least one transmitting coil element for transmitting inductive charge to said at least one receiving
coil element 21 . The presented arrangement for providing power to the said sensor arrangement 20 may also comprise an external power unit 23 coupled to said transmitting unit 22.
The at least one receiving coil element 21 on the apparatus shell surface 19 are arranged for receiving inductive charge from an at least one transmitting coil element arranged outside said large rotating mineral and metallurgical grinding mill. Respectively the at least one transmitting coil element of said transmitting unit 22 are arranged for transmitting inductive charge to said at least one receiving coil element 21 . Furthermore, the at least one transmitting coil element of said transmitting unit 22 are arranged close to the said at least one receiving coil element 21 at the shell surface of the large rotating mineral and metallurgical grinding mill.
The arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the present invention provides power to the sensor arrangement 20 on the apparatus shell surface 19 using a specific induction charging apparatus. Inductive charging uses an electromagnetic field to transfer energy between the at least one transmitting coil element of said transmitting unit 22 and the at least one receiving coil element 21 . Energy is transferred through an inductive coupling to the at least one receiving coil element 21 , which can then use that energy to function and to charge batteries.
In said induction charging apparatus an alternating electromagnetic field is created to the at least one transmitting coil element of said transmitting unit 22, and the at least one receiving coil element 21 in the large rotating min- eral and metallurgical grinding mill takes power from the electromagnetic field and converts said power back into electrical current for functioning and for charging the batteries of said sensor arrangement 20. Greater distances between the at least one transmitting coil element of said transmitting unit 22 and the at least one receiving coil element 21 can be used when the inductive charging system uses resonant inductive coupling.
The inductive power transfer is done either over the whole rotation cycle of the large rotating mineral and metallurgical grinding mill or during a portion of said rotation cycle.
Figure 7 shows a perspective view of a grinding mill drum having a third embodiment of an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical grinding mill according to the
present invention. The presented grinding mill has a drum shell surface marked with a reference number 5. On one end 24 of the grinding mill drum shell surface 5 there is arranged a sensor arrangement 25 according to the present invention.
The presented third embodiment of an arrangement for providing power to a sensor arrangement according to the present invention also comprises one receiving coil element 26 for receiving inductive charge, said receiving coil element 26 being arranged on one end 24 of the grinding mill drum shell surface 5. The receiving coil element 26 on one end 24 of the grinding mill drum shell surface 5 is arranged for receiving inductive charge from an at least one transmitting coil element arranged outside said large rotating mineral and metallurgical grinding mill. Said at least one transmitting coil element and/or the transmitting unit can be installed at the drum bearing housing.
The solution according to the present invention provides power to the sensor arrangement on large rotating mineral and metallurgical grinding mill sufficiently and reliably and for the entire runtime of the large rotating mineral and metallurgical grinding mill.
With the help of the solution according to the present invention the manufacturers of large rotating mineral and metallurgical grinding mill drums will be able to provide power to a sensor arrangement located on said large rotating mineral and metallurgical grinding mill itself.
It will be obvious to a person skilled in the art that, as the technology advances, the inventive concept can 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
1. A method for providing power to a sensor arrangement (6), (20), (25) on a large rotating mineral and metallurgical grinding mill, characterized by that the method comprising the steps of:
- creating an alternating electromagnetic field to an at least one transmitting coil element (13), (15-18) of a transmitting unit (12), (14), (22) arranged outside said large rotating mineral and metallurgical grinding mill; and
- taking power by receiving inductive charge from said alternating electromagnetic field by at least one receiving coil element (7-11), (21), (26) arranged at the shell surface (5), (19), (24) of said large rotating mineral and metallurgical grinding mill, and
- converting said power back into electrical current for functioning and for charging the batteries or other electrical storage device of said sensor arrangement (6), (20), (25).
2. A method according to claim 1, characterized in that in the step of taking power by receiving inductive charge from said alternating electromagnetic field, said at least one receiving coil element (7), (21), (26) is arranged on a portion of the entire shell surface (5), (19), (24) around the rotating mineral and metallurgical grinding mill.
3. A method according to claim 1, characterized in that in the step of taking power by receiving inductive charge from said alternating electromagnetic field, said at least one receiving coil element (8-11) for receiving inductive charge is arranged on the entire shell surface (5) around the rotating mineral and metallurgical grinding mill.
4. An arrangement for providing power to a sensor arrangement (6),
(20), (25) on a large rotating mineral and metallurgical grinding mill, characterized by said arrangement comprising:
- a transmitting unit (12), (14), (22) arranged outside said large rotating mineral and metallurgical grinding mill, said transmitting unit (12), (14), (22) having at least one transmitting coil element (13), (15-18) for creating an alternating electromagnetic field to said at least one transmitting coil element (13), (15-18) for transmitting inductive charge to an at least one receiving coil element (7-11), (21), (26); and
- an at least one receiving coil element (7-11), (21), (26) for taking power by receiving inductive charge, said at least one receiving coil element
(7-11 ), (21 ), (26) being arranged at the shell surface (5), (19), (24) of said large rotating mineral and metallurgical grinding mill;
wherein said at least one transmitting coil element (13), (15-18) of said transmitting unit (12), (14), (22) is arranged close to the said at least one receiving coil element (7-11), (21), (26) at the shell surface (5), (19), (24) of said large rotating mineral and metallurgical grinding mill.
5. An arrangement according to claim 4, characterized in that said at least one receiving coil element (7), (26) comprises one receiving coil element (7), (26).
6. An arrangement according to claim 4, characterized in that said at least one receiving coil element (8-11), (21) comprises several receiving coil elements (8-11), (21).
7. An arrangement according to any one of claims 4 to 6, c h a r- acterized in that said at least one receiving coil element (7), (21 ), (26) is arranged on a portion of the entire shell surface (5), (19), (24) around the rotating mineral and metallurgical grinding mill.
8. An arrangement according to any one of claims 4 to 6, c h a r- acterized in that said at least one receiving coil element (8-11 ) for receiving inductive charge is arranged on the entire shell surface (5) around the ro- tating mineral and metallurgical grinding mill.
9. An arrangement according to any one of claims 4 to 6, c h a r- acterized in that said at least one receiving coil element (26) is arranged on one end (24) of said shell surface (5), (24).
10. An arrangement according to claim 9, characterized in that said at least one transmitting coil element (13), (15-18) and/or the transmitting unit (12), (14), (22) is/are installed at the drum bearing housing.
11. An arrangement according to any one of claims 4 to 10, characterized in that said at least one transmitting coil element (13) of said transmitting unit (12) comprises one transmitting coil element (13).
12. An arrangement according to any one of claims 4 to 10, characterized in that said at least one transmitting coil element (15-18) of said transmitting unit (14), (22) comprises several transmitting coil elements (15-18).
13. An arrangement according to any one of claims 4 to 12, characterized in that said arrangement comprises an external power unit (23) coupled to said transmitting unit (22).
14. An arrangement according to any one of claims 4 to characterized in that said arrangement provides power to a se arrangement (6), (20), (25) on a large grinding mill drum.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20145393 | 2014-04-28 | ||
| FI20145393A FI20145393A7 (en) | 2014-04-28 | 2014-04-28 | A method and an arrangement for providing power to a sensor arrangement on a large rotating mineral and metallurgical process apparatus, and a sensor arrangement on a large rotating mineral and metallurgical process apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2015166139A1 true WO2015166139A1 (en) | 2015-11-05 |
Family
ID=53175076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FI2015/050287 Ceased WO2015166139A1 (en) | 2014-04-28 | 2015-04-27 | A method and an arrangement for providing power to a sensor arrangement on a tube mill |
Country Status (2)
| Country | Link |
|---|---|
| FI (1) | FI20145393A7 (en) |
| WO (1) | WO2015166139A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021045720A1 (en) * | 2019-09-02 | 2021-03-11 | Shumway Sheldon Dean | System to control parameters of a mill |
| CN115121334A (en) * | 2022-07-04 | 2022-09-30 | 广东技术师范大学 | A grinding device that continuously monitors the wear allowance of grinding media |
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|---|---|---|---|---|
| US5360174A (en) | 1991-07-12 | 1994-11-01 | Skega Ab | Arrangement for registering the instant grinding charge volume of a grinding drum |
| DE19933995A1 (en) * | 1999-07-20 | 2001-03-01 | Kima Ges Fuer Echtzeitsysteme | Measurement of the level of filling of a ball mill with aggregate by use of microphones attached directly to the wall of the mill to improve sound transmission from the mill interior and improve accuracy of level determination |
| WO2004004908A1 (en) * | 2002-07-05 | 2004-01-15 | Metso Minerals (Tampere) Oy | Method and apparatus for measuring and adjusting the setting of a crusher |
| US20040255680A1 (en) * | 2003-01-31 | 2004-12-23 | Ortega Luis Alberto Magne | System to determine and analyze the dynamic internal load in revolving mills, for mineral grinding |
| US6874364B1 (en) | 1999-07-09 | 2005-04-05 | Commonwealth Scientific And Industrial Research Organisation | System for monitoring mechanical waves from a moving machine |
-
2014
- 2014-04-28 FI FI20145393A patent/FI20145393A7/en not_active Application Discontinuation
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2015
- 2015-04-27 WO PCT/FI2015/050287 patent/WO2015166139A1/en not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5360174A (en) | 1991-07-12 | 1994-11-01 | Skega Ab | Arrangement for registering the instant grinding charge volume of a grinding drum |
| US6874364B1 (en) | 1999-07-09 | 2005-04-05 | Commonwealth Scientific And Industrial Research Organisation | System for monitoring mechanical waves from a moving machine |
| DE19933995A1 (en) * | 1999-07-20 | 2001-03-01 | Kima Ges Fuer Echtzeitsysteme | Measurement of the level of filling of a ball mill with aggregate by use of microphones attached directly to the wall of the mill to improve sound transmission from the mill interior and improve accuracy of level determination |
| WO2004004908A1 (en) * | 2002-07-05 | 2004-01-15 | Metso Minerals (Tampere) Oy | Method and apparatus for measuring and adjusting the setting of a crusher |
| US20040255680A1 (en) * | 2003-01-31 | 2004-12-23 | Ortega Luis Alberto Magne | System to determine and analyze the dynamic internal load in revolving mills, for mineral grinding |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021045720A1 (en) * | 2019-09-02 | 2021-03-11 | Shumway Sheldon Dean | System to control parameters of a mill |
| US20220297133A1 (en) * | 2019-09-02 | 2022-09-22 | Sheldon Dean Shumway | System to Control Parameters of a Mill |
| US11794193B2 (en) * | 2019-09-02 | 2023-10-24 | Sheldon Dean Shumway | System to control parameters of a mill |
| CN115121334A (en) * | 2022-07-04 | 2022-09-30 | 广东技术师范大学 | A grinding device that continuously monitors the wear allowance of grinding media |
| CN115121334B (en) * | 2022-07-04 | 2023-04-14 | 广东技术师范大学 | A grinding device for continuously monitoring the wear allowance of grinding media |
Also Published As
| Publication number | Publication date |
|---|---|
| FI20145393A7 (en) | 2015-10-29 |
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