EP0326876B1 - An apparatus for cooling and stripping objects cast in sand moulds - Google Patents
An apparatus for cooling and stripping objects cast in sand moulds Download PDFInfo
- Publication number
- EP0326876B1 EP0326876B1 EP89100981A EP89100981A EP0326876B1 EP 0326876 B1 EP0326876 B1 EP 0326876B1 EP 89100981 A EP89100981 A EP 89100981A EP 89100981 A EP89100981 A EP 89100981A EP 0326876 B1 EP0326876 B1 EP 0326876B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rolling
- drum
- secured
- support
- cooling
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
- B22D31/002—Cleaning, working on castings
- B22D31/007—Tumbling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying
- B22C5/085—Cooling or drying the sand together with the castings
Definitions
- the present invention relates to an apparatus for cooling and stripping cast objects, said apparatus being of the kind set forth in the preamble of claim 1.
- each support wheel in the form of a single, circular-cylindrical rim provides a simple and hence economical construction, and by equipping this rim with at least three rolling tyres with radially outward diminishing width in the axial direction, a uniform distribution of the support pressure between the rolling surface member and each support wheel is achieved, as a space is formed between adjacent rolling tyres, in which each tyre may expand in the axial direction when subjected to the support pressure from the rolling surface member.
- the resilient part of the support wheel were shaped in one piece - the material close to the center would experience a higher resistance against axial expansion than material close to the flanks, for which reason the support pressure per unit area would be greatest at the center of the support wheel. Due to the interspaces, the area of the rolling tyres is increased, which causes an improved cooling and hence a longer lifetime for the rolling tyres, normally consisting of organic material, such as synthetic rubber or an elastomeric synthetic resin, for which reason a thermal insulation of the rolling surfaces will normally be unnecessary.
- each rolling surface member comprises a rolling track termed "rolling surface” secured to the outer periphery of two continuous and substantially plane annular plates, the inner periphery of which is secured to the drum, whereas their outer peripheral edges are secured to the edges of said rolling tracks.
- rolling surface secured to the outer periphery of two continuous and substantially plane annular plates, the inner periphery of which is secured to the drum, whereas their outer peripheral edges are secured to the edges of said rolling tracks.
- the rolling track in such an arrangement corresponds to a beam being resiliently secured at the ends, and which hence exhibits a not insignificant deflection under load. In large drums with wider rolling tracks, critical bending stresses with imminent danger of fatigue fracture may occur.
- the apparatus shown in the drawing mainly comprises a drum 1, the forward part 1a of which is cylindrical and the rearward part 1b of which tapers towards the rear.
- a drum 1 Concentrically with the drum two rolling rings 2 are arranged, the construction of which is explained in more detail below.
- the rolling rings are bearing on support wheels 3, each being driven by a motor 4 with a gearbox 5.
- the drive is such that the drum rotates in the direction of the arrow P1.
- the support wheels 3 are journalled in foundation beams 6 bearing on a floor 7.
- the floor has a recess to accommodate a conveyor belt 8, the upper run of which moves in the direction of the arrow P2.
- the drum 1 At the forward end the drum 1 has an inlet opening 9, around which is disposed a suction box 10. Suction is caused by a suction device 11. Products P to be processed are fed from a conveyor belt 12, the upper run of which moves in the direction of the arrow P3.
- a delivery conveyor 13 Placed at the outlet opening of the drum is a delivery conveyor 13, the upper run of which moves in the direction of the arrow P4.
- the end portion of the drum 1 is construction in the form of a sieve wall 14.
- Fig. 2 shows how the mass centre M of the load consisting of mould sand and castings is placed to the left of the vertical plane V-V.
- This placing of the mass centre M produces a turning moment about the axis of rotation O of the drum 1.
- This turning moment is taken up by the tangential forces from the support wheels 3.
- the sum of the tangential forces have a not insignificant horizontal component.
- the sum of the radial forces from the wheels have a horizontal component equal and opposite to the horizontal component from the tangential forces.
- Placing the left support wheels 3 further to the left of the axis O produces a load distribution on the wheels that reduces the wear on the support wheels 3, compared to what would have been the case with a symmetrical arrangement.
- each support wheel 3 is composed of three rolling tyres 55 of resilient material, such as a synthetic resin, i.e. polyurethane, said tyres being placed around a circular-cylindrical rim 56 with a smooth cylindrical outer surface.
- the axial width of the three rolling tyres 55 diminishes slightly radially outward, for which reason they can carry radial compression forces in a substantially uniform manner, so that local load concentrations are avoided.
- the load on each support wheel may become as high as 20 tons, it is important to avoid such load concentrations, as these could otherwise damage the rolling tyres.
- a gearbox 5 with a coupled motor 4.
- a reaction arm 16 to the end of which is pivoted a buffer 17.
- the buffer 17 bears on the foundation beam 6.
- drum guide wheels 18 are rotatably supported in the foundation beam 6 on each side of the rolling ring 2.
- Fig. 3 shows a rolling ring 2 consisting of a relatively thick rolling track 57, which is secured to radially extending annular plates 58.
- the plates 58 are locally secured to the drum 1 at 33, vide Fig. 2.
- the plates 58 are connected to the rolling track 57 at distances 59 from the edges 60 of the rolling track 57 in such a manner that the ratio between each distance 59 and the axial width 61 of the rolling track 57 is approximately 1:6.
- This arrangement reduces the load stresses in the rolling track 57 to a minimum.
- this makes it possible to produce the rolling track 57 from relatively low-cost material, i.e. conventional sheet steel. no special machining being required.
- Spray means 54 may be placed within the drum 1 for spraying the loose sand being produced when the sand moulds are tumbled in the drum 1 during its rotation.
- the two foundation beams 6 are constructed substantially in the same manner and each has two support wheels, each with its own drive motor 4 and associated gearbox 5. Hence in cases where it is found necessary to keep spare foundation beams ready for use, it is sufficient to have a single foundation beam as a spare. If also the drive assemblies each consisting of a support wheel 3, a drive motor 4 and a gearbox 5, are of uniform construction, it is sufficient to keep one single drive assembly as a spare.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Disintegrating Or Milling (AREA)
- Tires In General (AREA)
- Underground Or Underwater Handling Of Building Materials (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
- The present invention relates to an apparatus for cooling and stripping cast objects, said apparatus being of the kind set forth in the preamble of claim 1.
- An apparatus of this kind is known from the European patent specifications No. 0 066 931. In this specification, it is not specified in detail how the support rollers are to be constructed in order to achieve the desired reduction in maintenance and the desired noise and shock absorption characteristics, but the specification does include the possibility of thermally insulating the annular rolling surfaces with respect to the drum jacket with a view to prolonging the lifetime of the synthetic resin rollers.
- On this background it is the object of the present invention to provide an apparatus of the kind referred to initially, with which the desired reduction in maintenance and the desired sound and shock absorption may be achieved with simple means without the necessity of providing a costly and in many cases highly inconvenient thermal insulation of the rolling surfaces, and this object is achieved in an apparatus also exhibiting the features set forth in the characterizing clause of claim 1. The construction of each support wheel in the form of a single, circular-cylindrical rim provides a simple and hence economical construction, and by equipping this rim with at least three rolling tyres with radially outward diminishing width in the axial direction, a uniform distribution of the support pressure between the rolling surface member and each support wheel is achieved, as a space is formed between adjacent rolling tyres, in which each tyre may expand in the axial direction when subjected to the support pressure from the rolling surface member. In the opposite case - i.e. if the resilient part of the support wheel were shaped in one piece - the material close to the center would experience a higher resistance against axial expansion than material close to the flanks, for which reason the support pressure per unit area would be greatest at the center of the support wheel. Due to the interspaces, the area of the rolling tyres is increased, which causes an improved cooling and hence a longer lifetime for the rolling tyres, normally consisting of organic material, such as synthetic rubber or an elastomeric synthetic resin, for which reason a thermal insulation of the rolling surfaces will normally be unnecessary.
- In the apparatus known from the above-mentioned European patent specification No. 0 066 931, each rolling surface member comprises a rolling track termed "rolling surface" secured to the outer periphery of two continuous and substantially plane annular plates, the inner periphery of which is secured to the drum, whereas their outer peripheral edges are secured to the edges of said rolling tracks. Seen in axial section, the rolling track in such an arrangement corresponds to a beam being resiliently secured at the ends, and which hence exhibits a not insignificant deflection under load. In large drums with wider rolling tracks, critical bending stresses with imminent danger of fatigue fracture may occur. With the embodiment set forth in claim 2, in which the rolling track corresponds to a beam supported at points distant from the ends, a not insubstantial reduction of both this deflection and the bending stresses is achieved, and hence also a more uniform distribution of the pressure between the rolling surface member and the support wheels, on which it rests and by which it is driven, so that the advantages referred to above that may be achieved with the new features according to claim 1 may be fully exploited.
- The invention will explained in more detail with reference to the drawing, in which
- Figure 1 is a perspective view of an exemplary embodiment of an apparatus according to the invention,
- Figure 2 is a section along the line II-II in Figure 1,
- Figure 3 is a section along the line III-III in Figure 1, and
- Figure 4 is a section along the line IV-IV in Figure 1.
- The apparatus shown in the drawing mainly comprises a drum 1, the forward part 1a of which is cylindrical and the rearward part 1b of which tapers towards the rear. Concentrically with the drum two rolling rings 2 are arranged, the construction of which is explained in more detail below. The rolling rings are bearing on
support wheels 3, each being driven by a motor 4 with agearbox 5. The drive is such that the drum rotates in the direction of the arrow P1. - The
support wheels 3 are journalled in foundation beams 6 bearing on a floor 7. The floor has a recess to accommodate a conveyor belt 8, the upper run of which moves in the direction of the arrow P2. - At the forward end the drum 1 has an inlet opening 9, around which is disposed a
suction box 10. Suction is caused by a suction device 11. Products P to be processed are fed from aconveyor belt 12, the upper run of which moves in the direction of the arrow P3. - Placed at the outlet opening of the drum is a
delivery conveyor 13, the upper run of which moves in the direction of the arrow P4. The end portion of the drum 1 is construction in the form of a sieve wall 14. - Fig. 2 shows how the mass centre M of the load consisting of mould sand and castings is placed to the left of the vertical plane V-V. This placing of the mass centre M produces a turning moment about the axis of rotation O of the drum 1. This turning moment is taken up by the tangential forces from the
support wheels 3. The sum of the tangential forces have a not insignificant horizontal component. The sum of the radial forces from the wheels have a horizontal component equal and opposite to the horizontal component from the tangential forces. Placing theleft support wheels 3 further to the left of the axis O produces a load distribution on the wheels that reduces the wear on thesupport wheels 3, compared to what would have been the case with a symmetrical arrangement. - As shown in Fig. 4 each
support wheel 3 is composed of threerolling tyres 55 of resilient material, such as a synthetic resin, i.e. polyurethane, said tyres being placed around a circular-cylindrical rim 56 with a smooth cylindrical outer surface. The axial width of the threerolling tyres 55 diminishes slightly radially outward, for which reason they can carry radial compression forces in a substantially uniform manner, so that local load concentrations are avoided. As the load on each support wheel may become as high as 20 tons, it is important to avoid such load concentrations, as these could otherwise damage the rolling tyres. - To the axle of each support wheel is fastened in a freely rotatable manner a
gearbox 5 with a coupled motor 4. To thegearbox 5 is fastened areaction arm 16 to the end of which is pivoted abuffer 17. Thebuffer 17 bears on the foundation beam 6. - For axially locking the
drum guide wheels 18 are rotatably supported in the foundation beam 6 on each side of the rolling ring 2. - Fig. 3 shows a rolling ring 2 consisting of a relatively thick
rolling track 57, which is secured to radially extendingannular plates 58. Theplates 58 are locally secured to the drum 1 at 33, vide Fig. 2. - On the edges facing away from the drum 1 the
plates 58 are connected to therolling track 57 atdistances 59 from theedges 60 of therolling track 57 in such a manner that the ratio between eachdistance 59 and theaxial width 61 of therolling track 57 is approximately 1:6. This arrangement reduces the load stresses in therolling track 57 to a minimum. Together with the use of the three (or more)rolling tyres 55 to cover therims 56 of the support wheels, this makes it possible to produce therolling track 57 from relatively low-cost material, i.e. conventional sheet steel. no special machining being required. - Spray means 54 may be placed within the drum 1 for spraying the loose sand being produced when the sand moulds are tumbled in the drum 1 during its rotation.
- As may be seen from the Figs. 1 and 2, the two foundation beams 6 are constructed substantially in the same manner and each has two support wheels, each with its own drive motor 4 and associated
gearbox 5. Hence in cases where it is found necessary to keep spare foundation beams ready for use, it is sufficient to have a single foundation beam as a spare. If also the drive assemblies each consisting of asupport wheel 3, a drive motor 4 and agearbox 5, are of uniform construction, it is sufficient to keep one single drive assembly as a spare.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT89100981T ATE79577T1 (en) | 1988-02-05 | 1989-01-20 | DEVICE FOR COOLING AND EMPTYING CASTINGS FROM SAND MOLDS. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK058388A DK164776C (en) | 1988-02-05 | 1988-02-05 | COOLING AND DEFORMING APPLIANCES FOR SANDFORM CASTED OBJECTS |
DK583/88 | 1988-02-05 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0326876A2 EP0326876A2 (en) | 1989-08-09 |
EP0326876A3 EP0326876A3 (en) | 1990-05-16 |
EP0326876B1 true EP0326876B1 (en) | 1992-08-19 |
Family
ID=8095201
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89100981A Expired - Lifetime EP0326876B1 (en) | 1988-02-05 | 1989-01-20 | An apparatus for cooling and stripping objects cast in sand moulds |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0326876B1 (en) |
CN (1) | CN1009712B (en) |
AT (1) | ATE79577T1 (en) |
BR (1) | BR8900462A (en) |
DE (1) | DE68902484T2 (en) |
DK (1) | DK164776C (en) |
ES (1) | ES2034409T3 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5267603A (en) * | 1993-01-19 | 1993-12-07 | Didion Manufacturing Company | Sand reclaiming drum with media recycler |
FR2735051A1 (en) * | 1995-06-09 | 1996-12-13 | Ronis Sa | Metal workpiece separating tunnel with sound insulating cladding |
ES2212708B2 (en) * | 2002-02-27 | 2005-04-01 | Urbar Ingenieros, S.A. | SUPPORT AND BEARING SYSTEM FOR FOUNDRY REMOVAL DRUM. |
CN103878352B (en) * | 2014-04-08 | 2015-11-04 | 苏州石川制铁有限公司 | A kind of method for foundry goods, running channel and rising head removing surface |
CN103978154B (en) * | 2014-04-22 | 2016-10-12 | 河北瑞欧消失模科技有限公司 | The pinwheel cooler that sand temperature automatically controls |
AT517133B1 (en) * | 2015-04-17 | 2017-09-15 | Fill Gmbh | Entkernmaschine / vibrating machine with improved drive |
CN105312547A (en) * | 2015-12-08 | 2016-02-10 | 广西长城矿山机械设备制造有限公司 | Casting cleaning support platform |
CN109465428A (en) * | 2018-12-10 | 2019-03-15 | 新晃远大机械铸造有限公司 | A kind of knock-out barrel |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB939723A (en) * | 1959-07-09 | 1963-10-16 | Mining Engineering Co Ltd | Improvements in impact rollers for belt conveyors |
GB939694A (en) * | 1961-02-28 | 1963-10-16 | Parker Ltd Frederick | Rotary vessels |
DE2012303A1 (en) * | 1970-03-14 | 1971-09-30 | Wedag Westfalia Dinnendahl | Running band for hot rotary equipment |
DE2145607C3 (en) * | 1971-09-13 | 1980-12-04 | Krupp Polysius Ag, 4720 Beckum | Race ring for rotary kilns, drying drums or the like |
BE858259A (en) * | 1977-08-31 | 1978-02-28 | Acec | MOTOR ROLLER FOR SUPPORTING AND DRIVING THE CYLINDRICAL FERRULE OF A 0 HORIZONTAL OR LOW INCLINED AXIS ROTARY GEAR |
NL8102714A (en) * | 1981-06-04 | 1983-01-03 | Multinorm Bv | Apparatus for treating one or more castings containing sand molds. |
-
1988
- 1988-02-05 DK DK058388A patent/DK164776C/en not_active IP Right Cessation
-
1989
- 1989-01-20 EP EP89100981A patent/EP0326876B1/en not_active Expired - Lifetime
- 1989-01-20 ES ES198989100981T patent/ES2034409T3/en not_active Expired - Lifetime
- 1989-01-20 AT AT89100981T patent/ATE79577T1/en active
- 1989-01-20 DE DE8989100981T patent/DE68902484T2/en not_active Expired - Fee Related
- 1989-02-02 CN CN89100617A patent/CN1009712B/en not_active Expired
- 1989-02-02 BR BR898900462A patent/BR8900462A/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ES2034409T3 (en) | 1993-04-01 |
CN1009712B (en) | 1990-09-26 |
DK58388A (en) | 1989-08-06 |
BR8900462A (en) | 1989-10-03 |
DK58388D0 (en) | 1988-02-05 |
ATE79577T1 (en) | 1992-09-15 |
DK164776B (en) | 1992-08-17 |
DK164776C (en) | 1992-12-28 |
DE68902484D1 (en) | 1992-09-24 |
DE68902484T2 (en) | 1993-01-14 |
CN1035969A (en) | 1989-10-04 |
EP0326876A3 (en) | 1990-05-16 |
EP0326876A2 (en) | 1989-08-09 |
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