CA2021220C - Magnetic trap assembly - Google Patents
Magnetic trap assemblyInfo
- Publication number
- CA2021220C CA2021220C CA 2021220 CA2021220A CA2021220C CA 2021220 C CA2021220 C CA 2021220C CA 2021220 CA2021220 CA 2021220 CA 2021220 A CA2021220 A CA 2021220A CA 2021220 C CA2021220 C CA 2021220C
- Authority
- CA
- Canada
- Prior art keywords
- floor
- nonmetallic
- recess
- pan
- conveyor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/04—Magnetic separation acting directly on the substance being separated with the material carriers in the form of trays or with tables
- B03C1/08—Magnetic separation acting directly on the substance being separated with the material carriers in the form of trays or with tables with non-movable magnets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
Landscapes
- Feeding Of Articles To Conveyors (AREA)
- Geophysics And Detection Of Objects (AREA)
- Sorting Of Articles (AREA)
Abstract
A magnetic trap in the pan floor of a vibratory conveyor comprises a recess in the pan floor for momentarily receiving articles falling therein. A magnet is provided beneath the recess to retain magnetic articles in the recess.
Description
M~ TIC TRAP ASSEMBLY
INTRODUCTION
This invention relates to the removal of foreign substances from the flow in a conveyor. More specifically, it relates to the removal of magnetic objects from a nonmagnetic flow in a vibrating~conveyor.
BACKGROUND OF THE INV~N'1'10N
In a processing system, conveyors are used to carry materials from one operation to the next. For operations to be performed effectively, the conveyed materials must meet some standard of purity. This requirement has produced various methods of separating flow elements in a conveyor system.
For example, in the forest products industry, machines operate on wood. The presence of harder substances such as metal can be dangerous to both the machines and the people operating them.
Conventionally, metal detectors are deployed along conveyors to stop the flow when metal is detected.
The operators must then manually search for the metal and remove it. This method can disrupt production schedules.
When setting the sensitivity of the metal detector, the operator must strike a fine balance. A
sensitive detector gives early warning and covers a large conveyor surface area. However, a sensitive detector needlessly disrupts flow when trace amounts of metal appear. Manual location and removal of these trace amounts is laborious.
.
~j.
SUMMARY OF THE INVENTION
According to the invention, there is provided in a vibrating conveyor having a substantially horizontal conveyor pan, a magnetic trap in the conveyor pan to remove foreign metalic substances from a flow along the conveyor pan, the magnetic trap comprising (a) a nonmetallic floor; (b) nonmetallic walls; (c) a nonmetallic recess in the floor to momentarily trap the flow; and (d) a magnet assembly beneath the recess to retain metallic objects in the recess.
Also according to the invention, there is provided a magnetic trap unit for a vibrating conveyor, comprising (a) a nonmetallic floor; (b) a pair of nonmetallic side walls on opposite sides of the nonmetallic floor; (c) a nonmetallic recess in the floor having a sheer leading edge and an upwardly sloped trailing edge having a summit that meets the pan floor;
and (d) a metal detector beneath said nonmetallic floor and located adjacent the recess on the trailing edge side of the recess.
Further according to the invention, there is provided in a vibrating conveyor having a substantially horizontal conveyor pan, a magnetic trap unit in the conveyor pan, comprising (a) a nonmetallic floor;
(b) a pair of nonmetallic side walls on opposite sides of the nonmetallic floor; (c) a nonmetallic recess in the floor having a sheer leading edge and an upwardly sloped trailing edge having a summit that meets the pan floor;
and (d) a metal detector beneath said nonmetallic floor and located adjacent the recess on the trailing edge side of the recess.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a three-dimensional view of a vibrating conveyor into which a magnetic trap assembly according to the invention is incorporated.
Figure 2 is a longitudinal section of a metal separation region of a pan of the conveyor of Figure 1, showing the magnetic trap.
Figure 3 is a cross section of the metal separation region of the pan of Figure 2.
Figure 4 is a longitudinal section of a magnet assembly of the magnetic trap according to the invention.
Figure 5 is a cross section of the magnet assembly of Figure 4.
DESCRIPTION OF A SPECIFIC EMBODIMENT
By way of example, a specific embodiment follows. It should be taken as only illustative of the _ 3 _ 2021220 invention, and not as limiting its scope which should be construed in accordance with the accompanying claims.
With reference to Figure 1, a vibrating conveyor is indicated generally at 10. The conveyor 10 comprises a base 12, a conveyor pan 14, a plurality of rockerlegs 16, a motor 18, an eccentric shaft 20, a plurality of coil spring assemblies 22, two balance bars 24, and a plurality of stabilizing crossties 26. The conveyor pan 14 further comprises a fines screen region 28, a metal separation region 30, and a conveyor spout 32.
With reference to Figure 2 and Figure 3, the metal separation region 30 is shown in greater detail.
The metal separation region 30 comprises a pair of nonmetallic pan walls 34, a nonmetallic pan floor 36, a metal detector 38 and a trap 40. The metal detector 38 is spaced slightly below the pan floor 36 so that the metal detector 38 itself does not vibrate. It is also located away from the metal part of the pan 14. The trap 40 further comprises a sheer leading edge 42, an embedded magnet assembly 44, and an upward sloping trailing edge 46 that meets the pan floor 36 at its summit.
With reference to Figure 4 and Figure 5, the magnet assembly 44 comprises a plurality of aligned magnets 48, two magnetic sidebars 50, and a plurality of nonmagnetic spacers 52. However, it will be appreciated that any suitable type of magnetic means may be used.
OPERATION
During operation of the vibrating conveyor 10, the pan 14 propels material along its length because it forms part of a harmonic system. The motor 18 drives the eccentric shaft 20 which supplies energy to the harmonic system comprised of the base 12, the pan 14, the rockerlegs 16, the coil spring assemblies 22, the balance bars 24, and the stabilizing crossties 26.
Two separation stages n~ceCR~ry to the forest products industry are indicated at 28 and 30. The fines screen region 28 is a sieve that removes undersized materials. The metal separation region 30 removes metallic materials.
According to the invention, metallic materials can be separated as depicted in Figure 2 and Figure 3. As the conveyed material flows through the metal separation region 30, it encounters the shear leading edge 42 of the trap 40. Large primary flow material (such as wood) will generally pass right over the trap 40 without effect.
Smaller material will drop into the trap 40. If the trapped material is magnetic, it will be seized by the magnet assembly 44 and held back until the trap 40 is manually cleaned out by an operator at a nondisruptive time. If the trapped material is nonmagnetic, the harmonic motion of the pan 14 will carry it up the trailing edge 46, out of the trap 40 and back into the primary flow.
Because the trap 40 will remove many of the smaller metallic impurities as well as some of the larger ones, the metal detector 38 can be set at a higher sensitivity with fewer disruptions due to trace amounts of metallic impurities.
INTRODUCTION
This invention relates to the removal of foreign substances from the flow in a conveyor. More specifically, it relates to the removal of magnetic objects from a nonmagnetic flow in a vibrating~conveyor.
BACKGROUND OF THE INV~N'1'10N
In a processing system, conveyors are used to carry materials from one operation to the next. For operations to be performed effectively, the conveyed materials must meet some standard of purity. This requirement has produced various methods of separating flow elements in a conveyor system.
For example, in the forest products industry, machines operate on wood. The presence of harder substances such as metal can be dangerous to both the machines and the people operating them.
Conventionally, metal detectors are deployed along conveyors to stop the flow when metal is detected.
The operators must then manually search for the metal and remove it. This method can disrupt production schedules.
When setting the sensitivity of the metal detector, the operator must strike a fine balance. A
sensitive detector gives early warning and covers a large conveyor surface area. However, a sensitive detector needlessly disrupts flow when trace amounts of metal appear. Manual location and removal of these trace amounts is laborious.
.
~j.
SUMMARY OF THE INVENTION
According to the invention, there is provided in a vibrating conveyor having a substantially horizontal conveyor pan, a magnetic trap in the conveyor pan to remove foreign metalic substances from a flow along the conveyor pan, the magnetic trap comprising (a) a nonmetallic floor; (b) nonmetallic walls; (c) a nonmetallic recess in the floor to momentarily trap the flow; and (d) a magnet assembly beneath the recess to retain metallic objects in the recess.
Also according to the invention, there is provided a magnetic trap unit for a vibrating conveyor, comprising (a) a nonmetallic floor; (b) a pair of nonmetallic side walls on opposite sides of the nonmetallic floor; (c) a nonmetallic recess in the floor having a sheer leading edge and an upwardly sloped trailing edge having a summit that meets the pan floor;
and (d) a metal detector beneath said nonmetallic floor and located adjacent the recess on the trailing edge side of the recess.
Further according to the invention, there is provided in a vibrating conveyor having a substantially horizontal conveyor pan, a magnetic trap unit in the conveyor pan, comprising (a) a nonmetallic floor;
(b) a pair of nonmetallic side walls on opposite sides of the nonmetallic floor; (c) a nonmetallic recess in the floor having a sheer leading edge and an upwardly sloped trailing edge having a summit that meets the pan floor;
and (d) a metal detector beneath said nonmetallic floor and located adjacent the recess on the trailing edge side of the recess.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a three-dimensional view of a vibrating conveyor into which a magnetic trap assembly according to the invention is incorporated.
Figure 2 is a longitudinal section of a metal separation region of a pan of the conveyor of Figure 1, showing the magnetic trap.
Figure 3 is a cross section of the metal separation region of the pan of Figure 2.
Figure 4 is a longitudinal section of a magnet assembly of the magnetic trap according to the invention.
Figure 5 is a cross section of the magnet assembly of Figure 4.
DESCRIPTION OF A SPECIFIC EMBODIMENT
By way of example, a specific embodiment follows. It should be taken as only illustative of the _ 3 _ 2021220 invention, and not as limiting its scope which should be construed in accordance with the accompanying claims.
With reference to Figure 1, a vibrating conveyor is indicated generally at 10. The conveyor 10 comprises a base 12, a conveyor pan 14, a plurality of rockerlegs 16, a motor 18, an eccentric shaft 20, a plurality of coil spring assemblies 22, two balance bars 24, and a plurality of stabilizing crossties 26. The conveyor pan 14 further comprises a fines screen region 28, a metal separation region 30, and a conveyor spout 32.
With reference to Figure 2 and Figure 3, the metal separation region 30 is shown in greater detail.
The metal separation region 30 comprises a pair of nonmetallic pan walls 34, a nonmetallic pan floor 36, a metal detector 38 and a trap 40. The metal detector 38 is spaced slightly below the pan floor 36 so that the metal detector 38 itself does not vibrate. It is also located away from the metal part of the pan 14. The trap 40 further comprises a sheer leading edge 42, an embedded magnet assembly 44, and an upward sloping trailing edge 46 that meets the pan floor 36 at its summit.
With reference to Figure 4 and Figure 5, the magnet assembly 44 comprises a plurality of aligned magnets 48, two magnetic sidebars 50, and a plurality of nonmagnetic spacers 52. However, it will be appreciated that any suitable type of magnetic means may be used.
OPERATION
During operation of the vibrating conveyor 10, the pan 14 propels material along its length because it forms part of a harmonic system. The motor 18 drives the eccentric shaft 20 which supplies energy to the harmonic system comprised of the base 12, the pan 14, the rockerlegs 16, the coil spring assemblies 22, the balance bars 24, and the stabilizing crossties 26.
Two separation stages n~ceCR~ry to the forest products industry are indicated at 28 and 30. The fines screen region 28 is a sieve that removes undersized materials. The metal separation region 30 removes metallic materials.
According to the invention, metallic materials can be separated as depicted in Figure 2 and Figure 3. As the conveyed material flows through the metal separation region 30, it encounters the shear leading edge 42 of the trap 40. Large primary flow material (such as wood) will generally pass right over the trap 40 without effect.
Smaller material will drop into the trap 40. If the trapped material is magnetic, it will be seized by the magnet assembly 44 and held back until the trap 40 is manually cleaned out by an operator at a nondisruptive time. If the trapped material is nonmagnetic, the harmonic motion of the pan 14 will carry it up the trailing edge 46, out of the trap 40 and back into the primary flow.
Because the trap 40 will remove many of the smaller metallic impurities as well as some of the larger ones, the metal detector 38 can be set at a higher sensitivity with fewer disruptions due to trace amounts of metallic impurities.
Claims (5)
1. In a vibrating conveyor having a substantially horizontal conveyor pan, a magnetic trap in the conveyor pan to remove foreign metalic substances from a flow along the conveyor pan, the magnetic trap comprising:
(a) a nonmetallic floor;
(b) nonmetallic walls;
(c) a nonmetallic recess in the floor to momentarily trap the flow; and (d) a magnet assembly beneath the recess to retain metallic objects in the recess.
(a) a nonmetallic floor;
(b) nonmetallic walls;
(c) a nonmetallic recess in the floor to momentarily trap the flow; and (d) a magnet assembly beneath the recess to retain metallic objects in the recess.
2. An apparatus as in claim 1 wherein the recess further comprises:
(a) a shear leading edge; and (b) an upwardly sloped trailing edge having a summit that meets the pan floor.
(a) a shear leading edge; and (b) an upwardly sloped trailing edge having a summit that meets the pan floor.
3. The apparatus as in claim 1, further comprising a metal detector beneath said nonmetallic floor and located in a direction which is downstream of said recess.
4. A magnetic trap unit for a vibrating conveyor, comprising:
(a) a nonmetallic floor;
(b) a pair of nonmetallic side walls on opposite sides of the nonmetallic floor;
(c) a nonmetallic recess in the floor having a sheer leading edge and an upwardly sloped trailing edge having a summit that meets the pan floor;
and (d) a metal detector beneath said nonmetallic floor and located adjacent the recess on the trailing edge side of the recess.
(a) a nonmetallic floor;
(b) a pair of nonmetallic side walls on opposite sides of the nonmetallic floor;
(c) a nonmetallic recess in the floor having a sheer leading edge and an upwardly sloped trailing edge having a summit that meets the pan floor;
and (d) a metal detector beneath said nonmetallic floor and located adjacent the recess on the trailing edge side of the recess.
5. In a vibrating conveyor having a substantially horizontal conveyor pan, a magnetic trap unit in the conveyor pan, comprising:
(a) a nonmetallic floor;
(b) a pair of nonmetallic side walls on opposite sides of the nonmetallic floor;
(c) a nonmetallic recess in the floor having a sheer leading edge and an upwardly sloped trailing edge having a summit that meets the pan floor;
and (d) a metal detector beneath said nonmetallic floor and located adjacent the recess on the trailing edge side of the recess.
(a) a nonmetallic floor;
(b) a pair of nonmetallic side walls on opposite sides of the nonmetallic floor;
(c) a nonmetallic recess in the floor having a sheer leading edge and an upwardly sloped trailing edge having a summit that meets the pan floor;
and (d) a metal detector beneath said nonmetallic floor and located adjacent the recess on the trailing edge side of the recess.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2021220 CA2021220C (en) | 1990-07-16 | 1990-07-16 | Magnetic trap assembly |
| PCT/CA1991/000251 WO1992001617A1 (en) | 1990-07-16 | 1991-07-16 | Magnetic trap assembly |
| AU80976/91A AU8097691A (en) | 1990-07-16 | 1991-07-16 | Magnetic trap assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2021220 CA2021220C (en) | 1990-07-16 | 1990-07-16 | Magnetic trap assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2021220A1 CA2021220A1 (en) | 1992-01-17 |
| CA2021220C true CA2021220C (en) | 1996-10-22 |
Family
ID=4145491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2021220 Expired - Lifetime CA2021220C (en) | 1990-07-16 | 1990-07-16 | Magnetic trap assembly |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU8097691A (en) |
| CA (1) | CA2021220C (en) |
| WO (1) | WO1992001617A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003053588A1 (en) * | 2001-12-20 | 2003-07-03 | Rampage Ventures Inc. | Removable magnetic wedge separator |
| US6708828B2 (en) | 2001-12-20 | 2004-03-23 | Rampage Ventures Inc. | Magnetically fastenable magnetic wedge separator |
| DE102008007950B3 (en) * | 2008-02-07 | 2008-11-06 | Kronotec Ag | Plant scattering wood chips or fibers onto conveyor to make e.g. chipboard or orientated strand board, includes magnetic distribution chute |
| US7900778B2 (en) | 2008-10-31 | 2011-03-08 | Syncrude Canada Ltd. | Apparatus and method for the detection and rejection of metal in particulate material |
| CN110433960B (en) * | 2019-08-30 | 2020-08-04 | 国闰建设集团有限公司 | Sieving mechanism for construction waste treatment |
-
1990
- 1990-07-16 CA CA 2021220 patent/CA2021220C/en not_active Expired - Lifetime
-
1991
- 1991-07-16 AU AU80976/91A patent/AU8097691A/en not_active Abandoned
- 1991-07-16 WO PCT/CA1991/000251 patent/WO1992001617A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| CA2021220A1 (en) | 1992-01-17 |
| WO1992001617A1 (en) | 1992-02-06 |
| AU8097691A (en) | 1992-02-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |