WO2007014444A1 - System for controlling the separation efficiency of vibrating screens - Google Patents
System for controlling the separation efficiency of vibrating screens Download PDFInfo
- Publication number
- WO2007014444A1 WO2007014444A1 PCT/BR2006/000155 BR2006000155W WO2007014444A1 WO 2007014444 A1 WO2007014444 A1 WO 2007014444A1 BR 2006000155 W BR2006000155 W BR 2006000155W WO 2007014444 A1 WO2007014444 A1 WO 2007014444A1
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- WO
- WIPO (PCT)
- Prior art keywords
- screen element
- bulk material
- load
- load sensor
- shaft
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
Definitions
- the present invention refers to a system for controlling the efficiency in the separation of bulk material in vibrating screens of the type comprising at least one screen element with a perforated floor and which is caused to vibrate by means of a vibrating assembly comprising at least two rotary shafts, with an eccentric weight being mounted to each shaft.
- the process for separating a particulate bulk material in the form of grains or particles of at least two different sizes in vibrating screens or machines consists in conveying the material along the screen perforated floor which is vibrated in a way that, upon displacement of the material, the particles pass through the floor apertures, so as to be separately released from the smaller particles.
- the vibrating movement imparted to the screen and to its separating perforated floor aims at promoting the conveyance of the bulk material on the perforated floor, as well as providing a sufficiently strong impulse to the material being conveyed in order to avoid a particle, which cannot pass through a screen aperture, from becoming clogged in the aperture, obstructing the passage of other smaller particles.
- Figure 1 of the enclosed drawings schematically illustrates a form of reciprocating linear movement "L" for a vibrating screen, which movement is obtained by the provision of at least two shafts 20 mounted, by means of bearings 21, to the screen element 10, as illustrated in figures Ia and Ib, each shaft 20 carrying an eccentric weight 30 and the shafts being rotated in opposite directions with the same frequency and in determined phases, which will define the inclination of the linear direction of the reciprocating movement in relation to the plane of the perforated floor 11 of the screen element 10.
- the synchronization between the two or more shafts 20, in order to determine a desired rotation phase of the respective weights 30, is generally obtained through appropriately designed gears 40.
- FIGs 2, 2a and 2b are views similar to those of figures 1, Ia and Ib respectively, although they illustrate, also schematically, a possible form of elliptical movement "E" for a vibrating screen, obtained by providing three shafts 20 which are mounted, by means of bearings 21, to the screen element 10, each shaft 20 carrying the same pattern of eccentric weight 30 and with two of the shafts 20 rotating in the same direction opposite to the rotation of the third shaft, in the same frequency and in determined phases to define the inclination of the largest axis of the ellipse "E" and the dimensional relation between the largest axis and the smallest axis.
- the synchronization among the three shafts is also generally obtained through gears 40.
- Figures 2c and 2d illustrate views similar to those of figures 2a and 2b, respectively, but illustrating an arrangement of two shafts 20 rotating at the same frequency and in opposite directions, each carrying an eccentric weight 30 with a value different from the other weight, so as to produce an elliptical movement
- the separation efficiency of the screen 10 depends on the thickness of the bulk material layer being displaced on the perforated floor 11 and on the time the bulk material remains on said perforated floor 11 (time of permanence) .
- time of permanence time of permanence
- the thickness of the bulk material layer being displaced on the screen element 10 results from both the feeding volume and the displacement speed, one should look for a solution of balance with a speed that allows to simultaneously achieve an optimized thickness of bulk material layer and an optimized time of permanence of the bulk material on the perforated floor.
- the conveying speed (displacement) of the bulk material in a vibrating screen may be adjusted within certain limits, by altering the vibration intensity
- the type of adjustment mentioned above is frequently carried out during the installation of the machine when the operational parameters of the vibrating screen are selected, by determining a conveying speed which may produce a bulk material layer on the screen element 10 with a thickness maintained within an acceptable superior limit, in order to lead to a maximum time of permanence of the particles on the vibrating perforated floor 11.
- a conveying speed which may produce a bulk material layer on the screen element 10 with a thickness maintained within an acceptable superior limit
- the modification of the dynamic operational parameters of the screen requires to stop the machine and carry out time-consuming manual adjustments in the driving mechanisms of the shafts that carry the eccentric weights .
- the known vibrating screens operate with a fixed adjustment for the dynamic parameters, losing the medium efficiency when the feeding rate is higher than the nominal one and without using the possibility of maintaining or even increasing the efficiency when the feeding rate is reduced. In this case, the conveying speed could be reduced, by increasing the time of permanence of the bulk material on the screen element
- An offset of 90 degrees between the shafts with eccentric weights generates a vibrating movement with an inclination of 45 degrees (half the offset angle) .
- An alteration of an additional offset angle between the shafts, controlled by electronic system, alters the angle of vibration in a value corresponding to half the addition or subtraction effected in the offset angle.
- control of the angle of vibration of the screen may be executed in a wide range, the vibration direction ranging from totally horizontal or totally vertical.
- the system described above is applied both to the arrangement of two shafts with equal counterweights, controlling the inclination of the vibration line, as well as to the arrangement with two shafts having unequal eccentric masses, controlling the inclination of the largest axis of the ellipse.
- the system for controlling the separation efficiency is applied to vibrating screens for classifying bulk material and of the type which comprises at least one screen element having a perforated floor and a vibrating assembly, which comprises at least two rotating shafts transversely mounted to the screen element and each carrying at least one eccentric weight and an electric motor coupled to the shaft, in order to make it rotate with the eccentric weight in synchronized opposite directions, and thus vibrate the screen element.
- the control system comprises a load sensor operatively associated with the screen element, so as to produce a signal representative of the bulk material load being fed to the screen element; a position sensor operatively associated with each shaft, so as to produce signals representative of the angular position of the respective shaft and respective eccentric weight; a frequency converter disposed in the power supply of at least one of the electric motors, each associated with a respective shaft; and a processing unit, which is operatively associated with the load sensor, the position sensors and the frequency converter, in order to instruct, through said frequency converter, a determined phase relationship between the shafts and a consequent conveying speed of the bulk material on the screen element, which speed is necessary to maintain the thickness of the bulk material load and its time of permanence on the screen element within predetermined values .
- the vibrating assembly comprises two or more shafts
- the deviations in the feeding rate of the bulk material supplied to the screen element are detected by the load sensor and transmitted to the processing unit.
- the invention provides a position sensor operatively associated with each shaft, in order to produce signals representative of the angular position of the respective shaft and respective eccentric weight, which signals are transmitted to the processing unit which, through at least one frequency converter, provides an adjustment in the phase relationship between the shafts, altering the inclination of the main vibration line and consequently varying the conveying speed of the bulk material, in order to adjust said speed to the bulk material feeding regime, maintaining the thickness of the material layer on the perforated floor within predetermined limits.
- Figure 1 schematically illustrates a known form of reciprocating linear movement for a screen element
- Figure Ia also schematically illustrates a lateral view of a screen element provided with two transverse rotary shafts, each carrying at least one eccentric weight, according to the prior art
- Figure Ib schematically illustrates an upper plan view of the screen element illustrated in figure Ia and having its two transverse rotating shafts of the vibrating assembly connected together by gears of a known prior art construction;
- Figures 2, 2a and 2b are views similar to those of figures 1, Ia and Ib, respectively, but also schematically illustrating a possible form of elliptical movement for the screen element obtained by the provision of three transverse shafts, all carrying the same pattern of eccentric weight, according to the prior art ;
- Figures 2c and 2d illustrate views similar to those of figures 2a and 2b, respectively, but illustrating the arrangement of two transverse shafts rotating at the same frequency and in opposite directions, each carrying an eccentric weight with a value ' different from that of the other weight, also according to the prior art ; and
- Figure 3 is a schematic and simplified upper plan view of a screen element, whose vibrating assembly is defined by a pair of transverse shafts, each driven by a respective electric motor.
- the invention is related to vibrating screens for classifying bulk material and, more specifically, to those type of screens comprising at least one screen element 10, generally in the form of an elongated chute with a substantially "U" -shaped profile and having a perforated floor 11 on which is conveyed a continuous load of bulk material, such as different types of ores.
- Figure 3 illustrates an arrangement to which the present control system can be applied, in which the screen element 10 presents a vibrating assembly VA defined by a pair of transverse shafts 20, each carrying, at an end thereof, a respective eccentric weight 30, each shaft being also mounted to the screen element 10 by means of respective bearings 21.
- each shaft 20 is coupled to a respective electric motor 60 by transmission means which can include pulleys 61, 62 and belts 63, or other transmission arrangement adequate for transmitting torque from the shaft of each motor 60 to the respective shaft 20 of the vibrating assembly VA.
- transmission means which can include pulleys 61, 62 and belts 63, or other transmission arrangement adequate for transmitting torque from the shaft of each motor 60 to the respective shaft 20 of the vibrating assembly VA.
- the present system for controlling the separation efficiency applied to the arrangement illustrated in figure 3 comprises a load sensor LS operatively associated with the screen element 10, in order to produce a signal representative of the bulk material load being fed to the screen element 10.
- the load sensor LS may be defined by a bulk material flow sensor disposed immediately upstream the screen element 10, for example close to the means which conduct the bulk material to the screen element 10.
- the load sensor LS may be defined by one or more weight sensors mounted in a suspension frame suitable for the screen element 10, said frame not being illustrated and described on account of not being part of the present invention.
- Another possible construction for the load sensor LS is the provision of a plurality of optical meters provided in the screen element 10, so as to detect at least one value for the thickness of the bulk material load passing on the screen element 10.
- a further alternative for the load sensor LS is defined by depth ultrasonic sensors mounted in the screen element 10, in order to detect the thickness of the bulk material load being displaced on said screen element 10.
- the main purpose of the load sensor LS is to determine the thickness of the bulk material load passing on the screen element 10 and to supply the system with a signal representative of the detection carried out for further processing, as described ahead.
- the thickness of the material layer in an outlet end of the perforated floor 11 must stay within limits of 1.5-4 times the desired separation size.
- the load sensor LS informs the processing unit 80 about said anomalous condition.
- the system further comprises a position sensor PS operatively associated with each shaft 20, so as to produce signals representative of the angular position of both the respective shaft 20 and the respective eccentric weight 30.
- a frequency converter 70 disposed in the power supply of at least one of the electric motors 60, as well as a processing unit 80, which is operatively associated with the load sensor LS, position sensors PS and frequency converter 70, in order to instruct, through said frequency converter 70, a determined phase relationship between the shafts 20 and thus a consequent conveying speed of the bulk material being displaced on the screen element 10, which speed is necessary to maintain the thickness of the bulk material load and its time of permanence on the screen element 10 within predetermined values.
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- Combined Means For Separation Of Solids (AREA)
Abstract
A system for controlling the separation efficiency of vibrating screens, of the type comprising a screen element (10), in which is rotatively mounted a shaft (20) carrying at least one eccentric weight (30) and which is rotatively driven by an electric motor (60). The system comprises a load sensor (LS) that produces a signal representative of the bulk material load being fed to the screen element (10); a frequency converter (70); and a processing unit (80), associated with both the load sensor (LS) and the frequency converter (70), in order to instruct a rotating speed of the electric motor (60), of the shaft (20) and of the eccentric weight (30) and a consequent conveying speed of the bulk material on the screen element (10), necessary to maintain the thickness of the bulk material load and its time of permanence on the screen element (10) within predetermined values.
Description
"SYSTEM FOR CONTROLLING THE SEPARATION EFFICIENCY OF VIBRATING SCREENS" Field of the Invention
The present invention refers to a system for controlling the efficiency in the separation of bulk material in vibrating screens of the type comprising at least one screen element with a perforated floor and which is caused to vibrate by means of a vibrating assembly comprising at least two rotary shafts, with an eccentric weight being mounted to each shaft. Prior Art
As known, the process for separating a particulate bulk material in the form of grains or particles of at least two different sizes in vibrating screens or machines consists in conveying the material along the screen perforated floor which is vibrated in a way that, upon displacement of the material, the particles pass through the floor apertures, so as to be separately released from the smaller particles. The vibrating movement imparted to the screen and to its separating perforated floor aims at promoting the conveyance of the bulk material on the perforated floor, as well as providing a sufficiently strong impulse to the material being conveyed in order to avoid a particle, which cannot pass through a screen aperture, from becoming clogged in the aperture, obstructing the passage of other smaller particles. Figure 1 of the enclosed drawings schematically illustrates a form of reciprocating linear movement "L" for a vibrating screen, which movement is obtained by the provision of at least two shafts 20 mounted, by means of bearings 21, to the screen element 10, as illustrated in figures Ia and Ib, each shaft 20 carrying an eccentric weight 30 and the shafts being rotated in opposite directions with the same frequency
and in determined phases, which will define the inclination of the linear direction of the reciprocating movement in relation to the plane of the perforated floor 11 of the screen element 10. As illustrated in figure Ib of the enclosed drawings, the synchronization between the two or more shafts 20, in order to determine a desired rotation phase of the respective weights 30, is generally obtained through appropriately designed gears 40. Figures 2, 2a and 2b are views similar to those of figures 1, Ia and Ib respectively, although they illustrate, also schematically, a possible form of elliptical movement "E" for a vibrating screen, obtained by providing three shafts 20 which are mounted, by means of bearings 21, to the screen element 10, each shaft 20 carrying the same pattern of eccentric weight 30 and with two of the shafts 20 rotating in the same direction opposite to the rotation of the third shaft, in the same frequency and in determined phases to define the inclination of the largest axis of the ellipse "E" and the dimensional relation between the largest axis and the smallest axis. The synchronization among the three shafts is also generally obtained through gears 40. Figures 2c and 2d illustrate views similar to those of figures 2a and 2b, respectively, but illustrating an arrangement of two shafts 20 rotating at the same frequency and in opposite directions, each carrying an eccentric weight 30 with a value different from the other weight, so as to produce an elliptical movement
"E" , such as the one exemplified in figure 2. The separation efficiency obtained through the vibrating screens for classifying bulk material processed in mining installations has been a constant worry, since the function of the vibrating screens is
to separate the rejected fraction from the product. Efficiency means the quantity of passing particles that are retained inside the rejected fraction in relation to the total content of said passing particles being supplied to the screen 10.
The separation efficiency of the screen 10 depends on the thickness of the bulk material layer being displaced on the perforated floor 11 and on the time the bulk material remains on said perforated floor 11 (time of permanence) . Thus, a very thick bulk material layer impairs the separation, requiring a longer time of permanence of the bulk material on the perforated floor 11 and consequently, a lower displacement speed of the bulk material on the screen element 10, in order to increase the separation result.
Considering that the thickness of the bulk material layer being displaced on the screen element 10 results from both the feeding volume and the displacement speed, one should look for a solution of balance with a speed that allows to simultaneously achieve an optimized thickness of bulk material layer and an optimized time of permanence of the bulk material on the perforated floor.
The conveying speed (displacement) of the bulk material in a vibrating screen may be adjusted within certain limits, by altering the vibration intensity
(amplitude or rotation) or adjusting the angle of vibration in the case of a linear movement "L" or elliptical movement "E", by modifying the horizontal conveying speed.
The type of adjustment mentioned above is frequently carried out during the installation of the machine when the operational parameters of the vibrating screen are selected, by determining a conveying speed which may produce a bulk material layer on the screen
element 10 with a thickness maintained within an acceptable superior limit, in order to lead to a maximum time of permanence of the particles on the vibrating perforated floor 11. However, in many cases, the feeding rate and the percentage of passing particles are not maintained constant during the operation of the vibrating screen, leading to instantaneous efficiency losses. The increase of the feeding rate can lead to a very thick bulk material layer, considerably impairing the separation. In this situation, a speed rise becomes a benefit, even shortening the time of permanence. Nevertheless, in the known vibration screens, the modification of the dynamic operational parameters of the screen requires to stop the machine and carry out time-consuming manual adjustments in the driving mechanisms of the shafts that carry the eccentric weights . On account of the time expended with the machine stop to adjust the parameters, due to a variation of the feeding rate which can suffer, soon after the adjustment, a new increasing or decreasing alteration, the known vibrating screens operate with a fixed adjustment for the dynamic parameters, losing the medium efficiency when the feeding rate is higher than the nominal one and without using the possibility of maintaining or even increasing the efficiency when the feeding rate is reduced. In this case, the conveying speed could be reduced, by increasing the time of permanence of the bulk material on the screen element
10.
Summary of the Invention
As a function of the deficiencies and drawbacks of the known vibrating screen, it is an object of the present invention to provide a system for controlling the
separation efficiency of said vibrating screens, which allows optimizing, continuously and automatically, the separation efficiency during possible variations of the bulk material feeding rate, with no need to stop the machine .
It is a more specific object of the present invention to provide a system for controlling the separation efficiency as defined above, which allows optimizing, continuously and automatically, the separation efficiency, maintaining the thickness of the bulk material layer and its time of permanence on the screen element within optimized values, by varying the conveying speed of the bulk material on the perforated floor of the screen element, altering the angle of vibration of the screen by varying the phase relationship between the shafts that carry the eccentric weights.
An offset of 90 degrees between the shafts with eccentric weights generates a vibrating movement with an inclination of 45 degrees (half the offset angle) . An alteration of an additional offset angle between the shafts, controlled by electronic system, alters the angle of vibration in a value corresponding to half the addition or subtraction effected in the offset angle.
It is important to note that the control of the angle of vibration of the screen may be executed in a wide range, the vibration direction ranging from totally horizontal or totally vertical. The system described above is applied both to the arrangement of two shafts with equal counterweights, controlling the inclination of the vibration line, as well as to the arrangement with two shafts having unequal eccentric masses, controlling the inclination of the largest axis of the ellipse.
As previously mentioned, the system for controlling the separation efficiency is applied to vibrating screens for classifying bulk material and of the type which comprises at least one screen element having a perforated floor and a vibrating assembly, which comprises at least two rotating shafts transversely mounted to the screen element and each carrying at least one eccentric weight and an electric motor coupled to the shaft, in order to make it rotate with the eccentric weight in synchronized opposite directions, and thus vibrate the screen element. According to the invention, the control system comprises a load sensor operatively associated with the screen element, so as to produce a signal representative of the bulk material load being fed to the screen element; a position sensor operatively associated with each shaft, so as to produce signals representative of the angular position of the respective shaft and respective eccentric weight; a frequency converter disposed in the power supply of at least one of the electric motors, each associated with a respective shaft; and a processing unit, which is operatively associated with the load sensor, the position sensors and the frequency converter, in order to instruct, through said frequency converter, a determined phase relationship between the shafts and a consequent conveying speed of the bulk material on the screen element, which speed is necessary to maintain the thickness of the bulk material load and its time of permanence on the screen element within predetermined values .
In the solution described above, in which the vibrating assembly comprises two or more shafts, the deviations in the feeding rate of the bulk material supplied to the screen element are detected by the
load sensor and transmitted to the processing unit. The invention provides a position sensor operatively associated with each shaft, in order to produce signals representative of the angular position of the respective shaft and respective eccentric weight, which signals are transmitted to the processing unit which, through at least one frequency converter, provides an adjustment in the phase relationship between the shafts, altering the inclination of the main vibration line and consequently varying the conveying speed of the bulk material, in order to adjust said speed to the bulk material feeding regime, maintaining the thickness of the material layer on the perforated floor within predetermined limits. Brief Description of the Drawings
The invention will be described bellow, with reference to the enclosed drawings, given by way of example of possible ways of carrying out the invention and in which: Figure 1 schematically illustrates a known form of reciprocating linear movement for a screen element; Figure Ia also schematically illustrates a lateral view of a screen element provided with two transverse rotary shafts, each carrying at least one eccentric weight, according to the prior art;
Figure Ib schematically illustrates an upper plan view of the screen element illustrated in figure Ia and having its two transverse rotating shafts of the vibrating assembly connected together by gears of a known prior art construction;
Figures 2, 2a and 2b are views similar to those of figures 1, Ia and Ib, respectively, but also schematically illustrating a possible form of elliptical movement for the screen element obtained by the provision of three transverse shafts, all carrying
the same pattern of eccentric weight, according to the prior art ;
Figures 2c and 2d illustrate views similar to those of figures 2a and 2b, respectively, but illustrating the arrangement of two transverse shafts rotating at the same frequency and in opposite directions, each carrying an eccentric weight with a value 'different from that of the other weight, also according to the prior art ; and Figure 3 is a schematic and simplified upper plan view of a screen element, whose vibrating assembly is defined by a pair of transverse shafts, each driven by a respective electric motor. Detailed Description of the Invention As illustrated and already mentioned above, the invention is related to vibrating screens for classifying bulk material and, more specifically, to those type of screens comprising at least one screen element 10, generally in the form of an elongated chute with a substantially "U" -shaped profile and having a perforated floor 11 on which is conveyed a continuous load of bulk material, such as different types of ores. Figure 3 illustrates an arrangement to which the present control system can be applied, in which the screen element 10 presents a vibrating assembly VA defined by a pair of transverse shafts 20, each carrying, at an end thereof, a respective eccentric weight 30, each shaft being also mounted to the screen element 10 by means of respective bearings 21. In the construction illustrated in figure 3, each shaft 20 is coupled to a respective electric motor 60 by transmission means which can include pulleys 61, 62 and belts 63, or other transmission arrangement adequate for transmitting torque from the shaft of
each motor 60 to the respective shaft 20 of the vibrating assembly VA.
The present system for controlling the separation efficiency applied to the arrangement illustrated in figure 3 comprises a load sensor LS operatively associated with the screen element 10, in order to produce a signal representative of the bulk material load being fed to the screen element 10. The load sensor LS may be defined by a bulk material flow sensor disposed immediately upstream the screen element 10, for example close to the means which conduct the bulk material to the screen element 10. In another possible construction, the load sensor LS may be defined by one or more weight sensors mounted in a suspension frame suitable for the screen element 10, said frame not being illustrated and described on account of not being part of the present invention. Another possible construction for the load sensor LS is the provision of a plurality of optical meters provided in the screen element 10, so as to detect at least one value for the thickness of the bulk material load passing on the screen element 10. A further alternative for the load sensor LS is defined by depth ultrasonic sensors mounted in the screen element 10, in order to detect the thickness of the bulk material load being displaced on said screen element 10. The main purpose of the load sensor LS is to determine the thickness of the bulk material load passing on the screen element 10 and to supply the system with a signal representative of the detection carried out for further processing, as described ahead.
In order to provide adequate separation efficiency, the thickness of the material layer in an outlet end of the perforated floor 11 must stay within limits of 1.5-4 times the desired separation size.
Thus, upon detecting an anomalous rise in the thickness of the bulk material load being displaced on the screen element 10, the load sensor LS informs the processing unit 80 about said anomalous condition. The system further comprises a position sensor PS operatively associated with each shaft 20, so as to produce signals representative of the angular position of both the respective shaft 20 and the respective eccentric weight 30. It is further provided a frequency converter 70 disposed in the power supply of at least one of the electric motors 60, as well as a processing unit 80, which is operatively associated with the load sensor LS, position sensors PS and frequency converter 70, in order to instruct, through said frequency converter 70, a determined phase relationship between the shafts 20 and thus a consequent conveying speed of the bulk material being displaced on the screen element 10, which speed is necessary to maintain the thickness of the bulk material load and its time of permanence on the screen element 10 within predetermined values.
In the construction of figure 3 , there are provided two shafts 20, one being driven by the respective motor 60, with no possibility of the latter having its driving characteristics modified by the present control system, only the other shaft 20 being operatively associated with the respective motor 60, whose drive is commanded through the frequency converter 70. This arrangement allows a simplified construction to be obtained, without affecting the possibility of the phase relationship between the two shafts 20 being appropriately adjusted through only one of the motors, as a function of the bulk material feeding regime .
Claims
1. A system for controlling the separation efficiency of vibrating screens, for classifying bulk material and of the type that comprises at least one screen element (10) having a perforated floor (11) and a vibrating assembly (VA) that comprises at least two rotating shafts (20) , transversely mounted to the screen element (10) and each carrying at least one eccentric weight (30) and an electric motor (60) coupled to the shaft (20) in order to make it rotate with the eccentric weight (30) in synchronized opposite directions, and thus vibrate the screen element (10) , said system being characterized in that it comprises a load sensor (LS) operatively associated with the screen element (10) , in order to produce a signal representative of the bulk material load being fed to the screen element (10) ; a position sensor (PS) operatively associated with each shaft (20) , in order to produce signals representative of the angular position of the respective shaft (20) and of the respective eccentric weight (30) ; a frequency converter (70) provided in the power supply of at least one of the electric motors (60) , each associated with a respective shaft (20) ; and a processing unit (80) operatively associated with the load sensor (LS) , position sensors (PS) and frequency converter (70) , in order to instruct, through the latter, a determined phase relationship between the shafts (20) and a consequent conveying speed of the bulk material on the screen element (10) , necessary to maintain the thickness of the bulk material load and its time of permanence on the screen element (10) within predetermined values.
2. The system as set forth in claim 1, characterized in that the frequency converter (70) is disposed in the power supply of only part of the electric motors (60) used in the vibrating assembly (VA) of the screen element .
3. The system as set forth in claim 1, characterized in that the load sensor (LS) is a bulk material flow sensor provided immediately upstream of the screen element (10) .
4. The system as set forth in claim 1, characterized in that the load sensor (LS) is a weight sensor mounted in a suspension frame of the screen element (10) .
5. The system as set forth in claim 1, characterized in that the load sensor (LS) is defined by a plurality of optical meters mounted in the screen element (10) in order to detect at least one value for the thickness of the bulk material load passing on the screen element (10) .
6. The system as set forth in claim 1, characterized in that the load sensor (LS) is defined by depth ultrasonic sensors mounted in the screen element (10) , so as to detect the thickness of the bulk material load on said screen element (10) .
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BRPI0503243-1 | 2005-08-04 | ||
| BRPI0503243 | 2005-08-04 | ||
| BRPI0602585-4A BRPI0602585A (en) | 2006-05-31 | 2006-05-31 | vibration screen separation efficiency control system |
| BRPI0602585-4 | 2006-05-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2007014444A1 true WO2007014444A1 (en) | 2007-02-08 |
Family
ID=37259518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/BR2006/000155 WO2007014444A1 (en) | 2005-08-04 | 2006-08-01 | System for controlling the separation efficiency of vibrating screens |
Country Status (2)
| Country | Link |
|---|---|
| PE (1) | PE20070556A1 (en) |
| WO (1) | WO2007014444A1 (en) |
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| BE1029354B1 (en) * | 2021-04-30 | 2022-12-05 | Thyssenkrupp Ag | Process for particle size-dependent optimization of a sieve with regard to product quality |
| BE1029359B1 (en) * | 2021-04-30 | 2022-12-05 | Thyssenkrupp Ind Solutions Ag | Process for operating a screening device to keep the product quality constant with a fluctuating mass flow |
| BE1029352B1 (en) * | 2021-04-30 | 2022-12-05 | Thyssenkrupp Ag | Method for using screening devices that are as light as possible |
| RU2794103C2 (en) * | 2017-12-12 | 2023-04-11 | Метсо Бразил Индустрия Э Комерсью Лтда. | Vibrating screen |
| US11623249B2 (en) | 2017-12-12 | 2023-04-11 | Metso Brasil Indústria E Comércio Ltda | Vibrating screen |
| WO2023111805A1 (en) * | 2021-12-13 | 2023-06-22 | Flsmidth A/S | Vibrating conveyor with imbalance exciter units arranged in clusters |
| BE1030008B1 (en) * | 2021-12-13 | 2023-07-10 | Smidth As F L | Vibrating conveyor with imbalance exciter units arranged in clusters |
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| US6354524B1 (en) * | 1997-06-20 | 2002-03-12 | Komatsu Ltd. | Mobile crushing machine |
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| WO2011110831A3 (en) * | 2010-03-08 | 2012-08-02 | National Oilwell Varco, L.P. | Apparatus and method for separating solids from a solids laden drilling fluid |
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| RU2801447C1 (en) * | 2022-09-16 | 2023-08-08 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Кубанский государственный технологический университет" (ФГБОУ ВО "КубГТУ") | Vibrating screen drive system control method |
| RU2814668C1 (en) * | 2023-08-04 | 2024-03-04 | Федеральное государственное бюджетное учреждение науки Институт проблем машиноведения Российской академии наук (ИПМаш РАН) | Control device for a vibration machine with two unbalanced vibration exciters |
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