CA2942712A1 - Chute or impact wall for use in opencast mining, comprising a heating device - Google Patents
Chute or impact wall for use in opencast mining, comprising a heating device Download PDFInfo
- Publication number
- CA2942712A1 CA2942712A1 CA2942712A CA2942712A CA2942712A1 CA 2942712 A1 CA2942712 A1 CA 2942712A1 CA 2942712 A CA2942712 A CA 2942712A CA 2942712 A CA2942712 A CA 2942712A CA 2942712 A1 CA2942712 A1 CA 2942712A1
- Authority
- CA
- Canada
- Prior art keywords
- chute
- wear
- elements
- impact wall
- flexible heating
- 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.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G69/00—Auxiliary measures taken, or devices used, in connection with loading or unloading
- B65G69/20—Auxiliary treatments, e.g. aerating, heating, humidifying, deaerating, cooling, de-watering or drying, during loading or unloading; Loading or unloading in a fluid medium other than air
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G11/00—Chutes
- B65G11/20—Auxiliary devices, e.g. for deflecting, controlling speed of, or agitating articles or solids
- B65G11/206—Auxiliary devices, e.g. for deflecting, controlling speed of, or agitating articles or solids for bulk
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/18—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels
- E02F3/181—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels including a conveyor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tunnel Furnaces (AREA)
- Auxiliary Methods And Devices For Loading And Unloading (AREA)
Abstract
The invention relates to a heating device, wherein, according to the invention, flexible heating elements (2), which can be adapted in the size and shape thereof to the contour of the surface to be heated, are arranged on the side of the chute (1) or of the impact wall facing the conveyed material. The flexible heating elements are arranged between wall elements (7) and wear-protection elements, wherein the wear-protection elements lie on spacing plates and centrally on a support plate by means of edge surfaces of the wear-protection elements and the flexible heating elements (2) are thus protected against contact with the conveyed material. The sticking and freezing of conveyed material to chutes and impact walls are prevented by using the heating device.
Description
WO 2015/135849 Al - 1 -CHUTE OR IMPACT WALL FOR USE IN OPENCAST MINING, COMPRISING
A HEATING DEVICE
The invention relates to a chute or impact wall for use in opencast mining with a heating device.
Chutes are used in opencast mining for transferring the conveyed material from a material feed point onto an onward-leading conveyor. Such chutes are used for example together with bucket wheels, wherein the chutes are constituted and arranged such that they carry the conveyed material falling out of the bucket wheel from the bucket wheel onto a conveyor belt. The lower edge of the fixedly arranged chute is located above the conveyor belt.
Depending on the composition of the conveyed material and the climatic conditions, the securing of uniform loading of the conveyor belt can prove to be difficult. Material which has an easily sliding consistency is able to spread uniformly over the conveyor belt, but when the material has a tendency towards caking or sticking or freezes at sub-zero temperatures, it is not dispersed uniformly over the belt, but rather remains adhering in the region of the chute. This leads to non-uniform loading of the conveyor belt and to material blockages in the transfer region. As a result of this, there is a reduction in the conveying capacity as well as non-uniform loading of the conveyor belt, which leads to serious disruptions with the continuous conveying operation.
A solution is known wherein rigid heating elements are fitted at the outer side of the chute facing away from the conveyed material, in order to prevent freezing of the conveyed material or, in the case are sticky, e.g. clayey material, to dry the latter on the wear-protection elements and to achieve flaking away from the wear-protection plates as a result of the internal stresses arising in the
A HEATING DEVICE
The invention relates to a chute or impact wall for use in opencast mining with a heating device.
Chutes are used in opencast mining for transferring the conveyed material from a material feed point onto an onward-leading conveyor. Such chutes are used for example together with bucket wheels, wherein the chutes are constituted and arranged such that they carry the conveyed material falling out of the bucket wheel from the bucket wheel onto a conveyor belt. The lower edge of the fixedly arranged chute is located above the conveyor belt.
Depending on the composition of the conveyed material and the climatic conditions, the securing of uniform loading of the conveyor belt can prove to be difficult. Material which has an easily sliding consistency is able to spread uniformly over the conveyor belt, but when the material has a tendency towards caking or sticking or freezes at sub-zero temperatures, it is not dispersed uniformly over the belt, but rather remains adhering in the region of the chute. This leads to non-uniform loading of the conveyor belt and to material blockages in the transfer region. As a result of this, there is a reduction in the conveying capacity as well as non-uniform loading of the conveyor belt, which leads to serious disruptions with the continuous conveying operation.
A solution is known wherein rigid heating elements are fitted at the outer side of the chute facing away from the conveyed material, in order to prevent freezing of the conveyed material or, in the case are sticky, e.g. clayey material, to dry the latter on the wear-protection elements and to achieve flaking away from the wear-protection plates as a result of the internal stresses arising in the
- 2 -conveyed material and the impact loads due to the conveyed material input. The drawback with these solutions is that the solid base body of the chute first has to be heated and the heat is only then introduced into the wear-protection elements which are in contact with the conveyed material.
The problem underlying the invention is to propose a chute or an impact wall for use in opencast mining, with which the caking and freezing of conveyed material is prevented under the most diverse conditions.
The chute or impact wall according to the invention for use in opencast mining has a heating device, which comprises flexible heating elements on the side of the wear-protection elements facing away from the conveyed material.
The heating energy is thus advantageously introduced directly onto the wear-protection elements. The heating elements are thus preferably fitted between the wear-protection elements and the outer wall of the conveying device. A thermal insulation layer is particularly preferably provided between the heating elements and the outer wall of the conveying device.
The flexible heating elements particularly preferably comprise two plastic sheets or synthetic rubber sheets into which flexible heating wires or heating foils are introduced. These flexible heating wires or heating foils are particularly preferably introduced in a water-tight manner.
The plastic sheets are preferably a fibre-plastic composite, for example glass fibre-reinforced silicone sheets. Neoprene sheets are preferably used as synthetic rubber sheets.
The flexible heating elements are advantageously insensitive to vibrations and impact loads, which are
The problem underlying the invention is to propose a chute or an impact wall for use in opencast mining, with which the caking and freezing of conveyed material is prevented under the most diverse conditions.
The chute or impact wall according to the invention for use in opencast mining has a heating device, which comprises flexible heating elements on the side of the wear-protection elements facing away from the conveyed material.
The heating energy is thus advantageously introduced directly onto the wear-protection elements. The heating elements are thus preferably fitted between the wear-protection elements and the outer wall of the conveying device. A thermal insulation layer is particularly preferably provided between the heating elements and the outer wall of the conveying device.
The flexible heating elements particularly preferably comprise two plastic sheets or synthetic rubber sheets into which flexible heating wires or heating foils are introduced. These flexible heating wires or heating foils are particularly preferably introduced in a water-tight manner.
The plastic sheets are preferably a fibre-plastic composite, for example glass fibre-reinforced silicone sheets. Neoprene sheets are preferably used as synthetic rubber sheets.
The flexible heating elements are advantageously insensitive to vibrations and impact loads, which are
- 3 -caused by the falling conveyed material in the region of the material transfer.
Depending on the conditions of use, the flexible heating elements are also advantageously heated to a temperature between 80 C to 200 C. Very particularly advantageously, the flexible heating elements are heated to a temperature of 180 C, as a result of which the surface temperature of the wear-protection elements is raised up to 140 C. The flexible heating elements can be used down to an ambient temperature of -50 C.
It is here that the particular advantage of the invention lies. Through the possibility of heating the wear-protection elements to a temperature of 140 C, which represents a marked increase in the achievable surface temperature compared to heating devices according to the prior art. As a result of the increase in temperature, it is possible to go into different materials to be conveyed, external conditions and conveying speeds. With a chute or an impact wall equipped with a heating device according to the invention, it is thus possible to operate a much higher conveying speed in the case of clayey conveyed material for example, since the clayey conveyed material is dried more quickly due to the higher temperature of the chute or impact wall and is thus caused to flake off by the resultant internal stresses.
The flexible heating elements are also preferably adaptable in their size and shape to the contour of the surface to be heated. Holes, cutouts or slots are advantageously introducable with greater geometrical variability.
Areas with irregular surface contours can also preferably be occupied, i.e. heated, with these flexible heating elements.
Depending on the conditions of use, the flexible heating elements are also advantageously heated to a temperature between 80 C to 200 C. Very particularly advantageously, the flexible heating elements are heated to a temperature of 180 C, as a result of which the surface temperature of the wear-protection elements is raised up to 140 C. The flexible heating elements can be used down to an ambient temperature of -50 C.
It is here that the particular advantage of the invention lies. Through the possibility of heating the wear-protection elements to a temperature of 140 C, which represents a marked increase in the achievable surface temperature compared to heating devices according to the prior art. As a result of the increase in temperature, it is possible to go into different materials to be conveyed, external conditions and conveying speeds. With a chute or an impact wall equipped with a heating device according to the invention, it is thus possible to operate a much higher conveying speed in the case of clayey conveyed material for example, since the clayey conveyed material is dried more quickly due to the higher temperature of the chute or impact wall and is thus caused to flake off by the resultant internal stresses.
The flexible heating elements are also preferably adaptable in their size and shape to the contour of the surface to be heated. Holes, cutouts or slots are advantageously introducable with greater geometrical variability.
Areas with irregular surface contours can also preferably be occupied, i.e. heated, with these flexible heating elements.
- 4 -Thermostats as temperature regulators or as temperature limiters can also preferably be vulcanised onto the heating element.
The flexible heating elements are particularly preferably arranged on the side of the wear-protection elements facing away from the conveyed material, between one or more wear-protection elements and the outer wall of the conveying device. The wear-protection elements are supported with their edge surfaces on spacing plates and centrally on one or more support plates. The central support plates can advantageously be connected in a form-fit or firmly bonded manner to the outer wall of the conveying device, in order that, during the fitting of the flexible heating elements, the position of the latter can be fixed. The spacing plates particularly advantageously prevent penetration of conveyed material into the installation space of the flexible heating elements.
The wear-protection elements are preferably made from wear-resistant materials, e.g. armoured wear plates, wear-resistant composite plates or wear plates made from suitable steel (e.g. S355), which is preferably hardened and/or tempered to improve the wear properties.
The spacing plates and support plates are preferably at least as thick as the heating elements.
According to a preferred embodiment, the flexible elements, which comprise a thermal insulation layer, are installed in such a way that the thermal insulation layer faces towards the outer wall of the conveying device. The heat transmission thus advantageously takes place predominantly in the direction of the wear-protection elements to be heated.
The flexible heating elements are particularly preferably arranged on the side of the wear-protection elements facing away from the conveyed material, between one or more wear-protection elements and the outer wall of the conveying device. The wear-protection elements are supported with their edge surfaces on spacing plates and centrally on one or more support plates. The central support plates can advantageously be connected in a form-fit or firmly bonded manner to the outer wall of the conveying device, in order that, during the fitting of the flexible heating elements, the position of the latter can be fixed. The spacing plates particularly advantageously prevent penetration of conveyed material into the installation space of the flexible heating elements.
The wear-protection elements are preferably made from wear-resistant materials, e.g. armoured wear plates, wear-resistant composite plates or wear plates made from suitable steel (e.g. S355), which is preferably hardened and/or tempered to improve the wear properties.
The spacing plates and support plates are preferably at least as thick as the heating elements.
According to a preferred embodiment, the flexible elements, which comprise a thermal insulation layer, are installed in such a way that the thermal insulation layer faces towards the outer wall of the conveying device. The heat transmission thus advantageously takes place predominantly in the direction of the wear-protection elements to be heated.
- 5 -The thermal insulation layer is advantageously produced from thermally non-conductive materials or materials with low thermal conductivity.
The wear-protection elements together with the spacing plates are also preferably connected in a form-fit or firmly bonded manner to the outer wall of the conveying device. The wear on the heating elements and the required number of connecting elements is thus advantageously reduced.
The form-fit or firmly bonded connection preferably takes place by means of a method selected from screwing, riveting, welding or adhesive bonding.
According to a preferred embodiment, at least one temperature measuring element is contained in the heating device according to the invention. The temperature measuring element is preferably arranged between the outer wall of the conveying device and the wear-protection elements and is positioned such that the temperature of the wear-protection elements is measured. The temperature measuring element is also preferably connected in a feedback circuit to one or more thermostats.
The temperature measuring element is particularly preferably a platinum measuring resistor.
The connecting cables for heating elements and the connections of the temperature measuring elements are also preferably passed backwards out of the wall element through bores. The supply lines can advantageously be brought together there in distributor boxes.
The invention is explained below with the aid of an example of embodiment, represented in three figures, without being limited thereto. In the figures:
The wear-protection elements together with the spacing plates are also preferably connected in a form-fit or firmly bonded manner to the outer wall of the conveying device. The wear on the heating elements and the required number of connecting elements is thus advantageously reduced.
The form-fit or firmly bonded connection preferably takes place by means of a method selected from screwing, riveting, welding or adhesive bonding.
According to a preferred embodiment, at least one temperature measuring element is contained in the heating device according to the invention. The temperature measuring element is preferably arranged between the outer wall of the conveying device and the wear-protection elements and is positioned such that the temperature of the wear-protection elements is measured. The temperature measuring element is also preferably connected in a feedback circuit to one or more thermostats.
The temperature measuring element is particularly preferably a platinum measuring resistor.
The connecting cables for heating elements and the connections of the temperature measuring elements are also preferably passed backwards out of the wall element through bores. The supply lines can advantageously be brought together there in distributor boxes.
The invention is explained below with the aid of an example of embodiment, represented in three figures, without being limited thereto. In the figures:
- 6 -Figure 1 shows a perspective view of a chute for a bucket-wheel excavator with the heating device according to the invention on the side facing the bucket wheel, Figure 2 shows a view of the side wall of a chute with the heating device accorded to the invention, said side wall lying opposite the bucket wheel, and Figure 3 shows a cross-sectional view of a heating element with a wear-protection element arranged above the latter.
Figure 1 and figure 2 show an arrangement of flexible heating elements (2) on the side walls (7) of a chute (1) for a bucket-wheel excavator. The flexible heating elements (2) are adapted in their shape to the contour of the side walls (7) and can thus be mounted close to the lower edge of the side walls (7).
Figure 3 shows a cross-sectional representation of the inventive arrangement of a flexible heating element (2) between an outer wall (7) of the chute and a wear-protection element (4).
A wear-protection element (4) of thickness 12 mm can be seen, which together with spacing plates (5) is screwed by means of countersunk screws M16 (8) to an outer wall (7) of the chute. The wear-protection element (4) lies centrally on a support plate (6) of diameter 50 mm, which is connected to the outer wall (7) by means of a slot weld.
The flexible heating elements (2) comprise a central cutout, with which they are advantageously fixed on the support plates (6) during assembly on the inclined walls.
Over the thickness of the spacing plates (5), it is possible to adjust the depth of the pocket which is formed
Figure 1 and figure 2 show an arrangement of flexible heating elements (2) on the side walls (7) of a chute (1) for a bucket-wheel excavator. The flexible heating elements (2) are adapted in their shape to the contour of the side walls (7) and can thus be mounted close to the lower edge of the side walls (7).
Figure 3 shows a cross-sectional representation of the inventive arrangement of a flexible heating element (2) between an outer wall (7) of the chute and a wear-protection element (4).
A wear-protection element (4) of thickness 12 mm can be seen, which together with spacing plates (5) is screwed by means of countersunk screws M16 (8) to an outer wall (7) of the chute. The wear-protection element (4) lies centrally on a support plate (6) of diameter 50 mm, which is connected to the outer wall (7) by means of a slot weld.
The flexible heating elements (2) comprise a central cutout, with which they are advantageously fixed on the support plates (6) during assembly on the inclined walls.
Over the thickness of the spacing plates (5), it is possible to adjust the depth of the pocket which is formed
- 7 -by the spacing plates arranged all around and in which the flexible heating element (2) is arranged protected against contact with conveyed material. In the specific case of application, the spacing plates are 5 mm thick. The flexible heating elements (2) lie with their thermal insulation layer (3) on the outer wall (7) of the chute. A
platinum measuring resistor (9), which detects the heating temperature, is inserted into a pocket-shaped recess of the flexible heating element. The connecting cables of the flexible heating element and the temperature sensor are led out via bores in the wall elements.
platinum measuring resistor (9), which detects the heating temperature, is inserted into a pocket-shaped recess of the flexible heating element. The connecting cables of the flexible heating element and the temperature sensor are led out via bores in the wall elements.
- 8 -List of reference numbers 1 chute 2 flexible heating element 3 thermal insulation layer 4 wear-protection element spacing plate 6 support plate 7 outer wall 8 countersunk screw
9 temperature measuring element electrical connecting cable
Claims (12)
1. A chute or impact wall for a conveying device in opencast mining comprising a heating device, characterised in that the chute or impact wall comprises wear-protection elements (4) and flexible heating elements (2) are arranged on the side of at least one wear-protection element (4) facing away from the conveyed material.
2. The chute or impact wall according to claim 1, characterised in that the flexible heating elements (2) consist of flexible heating wires or heating foils which are introduced between two plastic sheets or synthetic rubber sheets.
3. The chute or impact wall according to claim 1 or 2, characterised in that the flexible heating elements (2) are introduced between the two plastic sheets or synthetic rubber sheets in a water-tight manner.
4. The chute or impact wall according to claim 2 or 3, characterised in that the plastic sheets are glass fibre-reinforced silicone sheets.
5. The chute or impact wall according to any one of the preceding claims, characterised in that the flexible heating elements (2) are adapted in their size and shape to the contour of the surface to be heated.
6. The chute or impact wall according to any one of the preceding claims, characterised in that the flexible heating elements (2) are arranged between the outer wall of the conveying device and one or more wear-protection elements (4), wherein the wear-protection elements (4) are supported with their edge surfaces on spacing plates and centrally on one or more support plates (6).
7. The chute or impact wall according to any one of the preceding claims, characterised in that the flexible heating elements (2) comprise a thermal insulation layer (3) orientated towards the outer wall of the conveying device.
8. The chute or impact wall according to any one of the preceding claims, characterised in that the wear-protection elements (4) together with the spacing plates (6) are connected in a form-fit or firmly bonded manner to the outer wall of the conveying device.
9. The chute or impact wall according to any one of the preceding claims, characterised in that the heating device comprises at least one temperature measuring element (9).
10. The chute or impact wall according to claim 9, characterised in that the temperature measuring element (9) is coupled in a control loop with the flexible heating element (2).
11. The chute or impact wall according to any one of the preceding claims, characterised in that the connecting cables for heating elements (2) and the connections of the temperature measuring elements (9) are passed backwards out of the inner wall of the conveying device through bores.
12. Use of at least one flexible heating element (2) for heating a chute or impact wall, wherein the chute or impact wall at least one wear-protection element (4) and the least one flexible heating element (2) are arranged on the side of the least one wear-protection element (4) facing away from the conveyed material.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102014204773.0A DE102014204773A1 (en) | 2014-03-14 | 2014-03-14 | Heating device for chutes and baffles |
| DE102014204773.0 | 2014-03-14 | ||
| PCT/EP2015/054729 WO2015135849A1 (en) | 2014-03-14 | 2015-03-06 | Chute or impact wall for use in mining, comprising a heating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2942712A1 true CA2942712A1 (en) | 2015-09-17 |
Family
ID=52629581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2942712A Abandoned CA2942712A1 (en) | 2014-03-14 | 2015-03-06 | Chute or impact wall for use in opencast mining, comprising a heating device |
Country Status (4)
| Country | Link |
|---|---|
| CA (1) | CA2942712A1 (en) |
| DE (1) | DE102014204773A1 (en) |
| EA (1) | EA201600620A1 (en) |
| WO (1) | WO2015135849A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109827320A (en) * | 2019-01-07 | 2019-05-31 | 中国华冶科工集团有限公司 | A kind of mine chute heating device |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2945938A (en) * | 1958-06-10 | 1960-07-19 | Syntron Co | Heated liner for trough feeders |
| JPS5436456Y2 (en) * | 1974-02-27 | 1979-11-02 | ||
| US4078729A (en) * | 1976-10-21 | 1978-03-14 | Gary Lynn Foltz | Manure spreader vehicle with heated floor |
| US5285047A (en) * | 1992-08-06 | 1994-02-08 | Petrelli Michael S | Method and apparatus for preventing carry back in a rail car using an on-board heating device |
| US6483087B2 (en) * | 1999-12-10 | 2002-11-19 | Thermion Systems International | Thermoplastic laminate fabric heater and methods for making same |
| JP2006051887A (en) * | 2004-08-12 | 2006-02-23 | Iwaki Kensetsu Unyu Kk | Cargo heating motor vehicle |
| US20060278631A1 (en) * | 2005-06-10 | 2006-12-14 | Challenge Carbon Technology Co., Ltd. Of Taiwan | Laminate fabric heater and method of making |
| JP2007145171A (en) * | 2005-11-28 | 2007-06-14 | Nissan Diesel Motor Co Ltd | Dump truck |
| US20100051604A1 (en) * | 2008-05-28 | 2010-03-04 | Vladimir Nikolayevich Davidov | Safe planar electrical heater |
| DE202009000136U1 (en) * | 2008-07-29 | 2009-05-20 | Beier, Gerhard M., Dipl.-Ing. | Infrared CNT heater |
| DE202010009208U1 (en) * | 2010-06-17 | 2010-09-16 | Futurecarbon Gmbh | Flexible heating element |
-
2014
- 2014-03-14 DE DE102014204773.0A patent/DE102014204773A1/en not_active Withdrawn
-
2015
- 2015-03-06 EA EA201600620A patent/EA201600620A1/en unknown
- 2015-03-06 CA CA2942712A patent/CA2942712A1/en not_active Abandoned
- 2015-03-06 WO PCT/EP2015/054729 patent/WO2015135849A1/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109827320A (en) * | 2019-01-07 | 2019-05-31 | 中国华冶科工集团有限公司 | A kind of mine chute heating device |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102014204773A1 (en) | 2015-09-17 |
| EA201600620A1 (en) | 2016-12-30 |
| WO2015135849A1 (en) | 2015-09-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20160926 |
|
| FZDE | Dead |
Effective date: 20190228 |