EP0066931A1 - Appareil pour traiter des moules en sable contenant plusieurs pièces coulées - Google Patents

Appareil pour traiter des moules en sable contenant plusieurs pièces coulées Download PDF

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Publication number
EP0066931A1
EP0066931A1 EP82200677A EP82200677A EP0066931A1 EP 0066931 A1 EP0066931 A1 EP 0066931A1 EP 82200677 A EP82200677 A EP 82200677A EP 82200677 A EP82200677 A EP 82200677A EP 0066931 A1 EP0066931 A1 EP 0066931A1
Authority
EP
European Patent Office
Prior art keywords
drum
sand
wheels
castings
wall
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.)
Granted
Application number
EP82200677A
Other languages
German (de)
English (en)
Other versions
EP0066931B1 (fr
Inventor
Jan Theodorus Voorneveld
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dansk Industri Syndikat AS
Original Assignee
Dansk Industri Syndikat AS
Multinorm BV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dansk Industri Syndikat AS, Multinorm BV filed Critical Dansk Industri Syndikat AS
Publication of EP0066931A1 publication Critical patent/EP0066931A1/fr
Application granted granted Critical
Publication of EP0066931B1 publication Critical patent/EP0066931B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • the invention relates to a device for processing sand moulds containing one or more castings in order to separate the castings from the mould sand, to cool them and to condition the mould sand for re-use, said device mainly comprising a horizontal drum rotatably supported by wheels and having an inlet and an outlet opening and at least two annular rolling surfaces arranged around the drum for ground wheels bearing on a foundation, at least one of said wheels being driven.
  • the invention has for its object to improve a device of the kind set forth in the preamble in a sense such that the drive for the wheels is simplified.
  • the device is distinguished in that the medium longitudinal plane of the ground wheels going through the centre of the drum is shifted at the driven side through a given angle in the direction of rotation of the drum with respect to the vertical going through said centre.
  • each motor or transmission casing is connected with the foundation through a buffer in accordance with the invention.
  • a reaction member between the opposite wheels of two rolling surfaces said member being preferably formed by a coupling rod via the wheels so that the foundation is relieved. Consequently the foundation may be of a relatively light structure.
  • the wheels in the form of rollers of synthetic resin, for example, polyurethane.
  • the annular rolling surfaces are formed by a circular rolling plate, one or more spacers being arranged between the plate and the drum wall, whilst an insulating material is sandwitched between the plate and the drum wall. Thanks to this construction the conduction heat or the radiation heat respectively is appreciably reduced. According to a further step the insulation should terminate at a given distance from the drum wall so that a cooling gap is left.
  • the spacers are formed by annular plates locally connected.with the drum wall.
  • the drum wall is thickened at the area of the annular rolling surface, said thickened part may be built up, in particular at the inlet side of the drum, from more than one layer in order to reduce conduction heat from the interior across the drum wall.
  • Each layer may be made from the appropriate material.
  • the axial inlet opening of the drum in the embodiment described above is improved so that mould pieces can be introduced without disturbance.
  • a substantially horizontal supporting surface is arranged in the axial inlet opening of the drum, to the lower side of said opening is suspended a skirt extending closely to the drum wall. Owing to said skirt the axial length of the supporting surface can be reduced so that the mould pieces can drop earlier into the drum without an outflow of material on the underside of the supporting surface.
  • the drum can contain a bigger charge now.
  • the upper rim of the skirt is upwardly inclined near the rising side of the drum away from the centre in order to further prevent said undesirable outflow.
  • the supporting surface and the skirt form part of a suction box in front of the inlet of the drum.
  • suction of undesirable air neat the inlet opening from outside the drum is avoided so that cooling of air aspired through the inlet opening in the drum is improved.
  • the device of the kind described in the preamble is provided with spray means in the drum for spreading a cooling fluid, said spray means being subdivided into separately controllable sections. In this manner conditioning of the mould sand can be more accurately controlled.
  • a passage is provided in the drum wall near the last spray section. Through said passage can flow mould sand, the rate of flow being determinative of the-humidity of the mould sand.
  • a mould sand sample is obtained, which can be ckecked for the desired condition so that in the event of a deviation the spray sections can be adjusted.
  • an agitator is arranged on the inner side of the drum, preferably in the form of a pivotable flap, the pivotal axis of which is axially directed. Moreover the pivotal shaft is disposed on the front side of the flap with respect to the direction of rotation so that the flap is self-cleaning and disengages any castings or mould sand near the passage.
  • monitoring means in the path of the passage and outside the drum, preferably in the form of a temperature meter, a humidity meter or a sensor assessing the presence of mould sand.
  • the invention furthermore relates to the end part of the drum in a device of the kind set forth in the preamble, said end part being constructed near the axial outlet orifice in the form of a sieve wall.
  • sand collecting members are preferably arranged for shedding the sand back to the sieve wall during the rotation of the drum. In this way the mould sand is additionally cooled off.
  • the sand collecting elements are preferably formed by a unilaterally opened, circular tray equipped with blades.
  • the depth of the tray is smaller than the length of the sieve wall so that at the beginning the sand is each time conveyed back, but after the passing of the tray it is removed from the drum through the sieve wall.
  • the sieve wall is preferably provided on the inner side with catching members which carry along the castings through a given angle so that, when the castings are dropping down, a cleaning effect is obtained.
  • the sieve wall is equipped on the inner side near the outlet orifice of the drum with a threshold which ensures a final separation between castings and mould sand.
  • a delivery belt conveyor is axially arranged beneath the drum so that sand emanating from the sieve wall, the passage or the inlet orifice respectively can be removed by the same belt conveyor.
  • the device illustrated in the figures mainly comprises a drum 1, the beginning 1a of which is cylindrical and the rear part 1b of which is tapering to the rear.
  • a drum 1 Concentrically with the drum are arranged two rolling rings 2, the construction of which will be described more fully hereinafter.
  • the rolling rings are bearing on ground wheels 3, which are driven at the front by a motor 4 with a transmission casing 5.
  • the drive is such that the drum rotates in the direction of the arrow P 1.
  • the wheel sets 3 are journalled in foundations 6 bearing on a floor 7.
  • the floor has a recess for accomoda- ting a conveyor belt 8, the upper run of which moves in the direction of the arrow P 2.
  • the drum 1 has an inlet opening 9, around which is disposed a suction box 10. Suction is performed by a suction set 11.
  • the products P to be processed are fed from a conveyor belt 12, the upper run of which moves in the direction of the arrow P 3.
  • inlet opening is described more fully hereinafter.
  • delivery conveyor 13 the upper run of which moves in the direction of the arrow P 4.
  • end part of the drum is constructed in the form of a sieve wall, which end part will be described hereinbelow.
  • Fig. 2 illustrates one of the characteristic features of the invention, that is to say, the medium longitudinal plane perpendicular to the plane of the drawing,designated by the line L-L is at an angle to the vertical indicated by the line V-V. This angle is located on the side of the plane L-L to which the direction of rotation of the drum P 1 is directed. This disposition serves to ensure that the load formed by mould sand and castings indicated by the line 15 is mainly located on the left-hand side of the plane V-V. Therefore, by disposing the left-hand wheel set more to the left than the centre an improved distribution of weight on the wheels is obtained. This improved weight distribution is to the benefit of the transferred driving power on the drum.
  • each wheel set 3 is formed by two rollers, preferably, of synthetic resin, for example, polyurethane having a smooth, cylindrical outer jacket.
  • a transmission casing 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.
  • the buffer 17 ensures that the reaction arm 16 can perform a given angular rotation with espect to the axis of the wheel 3 so that any non-circularity of the rolling ring 2 does not affect the drive. If the reaction arm 16 were rigidly secured to the foundation 6 the transmission will be subjected to high forces and there would be a risk of slip between the ground wheel 3 and the ring 2.
  • a guide wheel 18 is arranged on both sides of the rolling ring 2 so as to be rotatable in the foundation beam 6. Such a guide wheel 18 lies beyond the scope of the invention.
  • Figs. 3 and 4 show an alternative ambodiment of the driven ground wheels 3, which are pairwise arranged in a rocker 20.
  • Each ground wheel is driven by the motor 4 through the transmission casing 5.
  • the motor 4 and the transmission casing 5 are also coupled with the rocker 20.
  • the rocker is rotatable about a shaft 21 which is parallel wo the wheel axles and which is journalled in the foundation 6.
  • each transmission casing 5 is provided with a reaction arm 16, which is connected through a coupling rod 22 with the foundation 6 (see fig. 4).
  • the point of connection lies on the same line parallel to shaft 21 and symmentrical to the standing mid-plane so that the rocker is prevented from getting out of square with respect to the rolling ring 2, during the drive thereof.
  • the rocker is also provided with two guide wheels 18, on both sides of the ring 2, which has the same function as in the embodiment described above. It will be obvious that such a rocker construction is appropriate for particularly heavy drums capable of taking a heavy load.
  • the drum When the device is put out of operation, for example, for cleaning or repair purposes, the drum has to cool down to the normal ambient temperature. This brings about shrinkage of the drum, which can be compensated for in a conventional manner by rotating the drum after some interval so that the wheels 3 can match the varying longitudinal distance between the rolling rings 2.
  • this rotation of the drum requires an accurate watch of the maintenance personel and a high power and therefore, the invention proposes to arrange a reaction member 23 between the axles of the wheels 3 located opposite one another and rolling along the relatively spaced rolling rings 2. It is thus ensured that the distance between the wheel axles does not vary so that the foundation plate 6 will not be exposed to an excessive load (see fig. 5).
  • Ir is preferred for the right-hand wheel 3 of fig. 5 to be able to perform a slight axial shift with respect to the axle.
  • an axial buffer 24, 25 the inner axial buffers 5 have different elasticity with respect to the outer axial buffers 24. In this manner an inward displacement of the wheels can, indeed, be performed, but an outward displacement is more difficult.
  • Fig. 6 shows an embodiment of a rolling ring 2 consisting of a relatively thick top plate 30 fastened at both ends in radiallyy directed, annular plates 31.
  • the plates 31 are locally fastened to the wall 32 of the drum 1, which is indicated in fig. 2 at 33.
  • the plates 31 are interconnected by a filling plate 34 so that insulating material 35 can be inserted between the plate 34 and the plate 30.
  • the drum wall 32 consists of three layers which not only locally strenghten the drum wall, but also have an insulation function for the heat transfer from the drum across the drum wall to the outside.
  • the plate 34 a gap-shaped space is maintained between the insulating material 35 and the drum wall 32, through which additional cooling is obtained.
  • Figs. 7, 8 and 9 relate to the inlet opening at the front of the device of fig. 1.
  • the inlet opening is located in an axial end surface of the drum 1 and is formed by a ring 40, which is fastened to the head-end of the drum wall.
  • a supporting plate 41 of relatively small length, to the lower side of which is fastened a skirt plate 42.
  • the skirt plate 42 is located inside the drum and extends up to the inner side of the drum jacket i.e. beyond the inner edge of the ring 40 (see fig. 8).
  • the supporting plate 41 is adjoined by the feeding conveyor 12 for feeding the products to be processed.
  • a suction box 10 which is closed in all sides with the exception of parts near the inlet opening 9 and the inlet opening 43 for the products and which is provided at the top with a suction pipe 44.
  • the inlet opening 43 is partly closed by hanging flaps 45.
  • Fig. 9 clearly shows that the skirt plate 42 covers a large part of the underside of the inlet opening 9 and closes the same.
  • the upper rim 46 of the plate 42 is upwardly inclined in order to adapt it to the talus angle of the load in the drum.
  • the load can get further towards the inlet opening 9 so that the length of the supporting plate 41 can be reduced, which prevents jamming of the products P supplied on the belt 12. Further the rate of charging can be raised.
  • Figs. 10, 11 and 12 show a passage 50 in the drum wall, which serves to allow batches of mould sand to pass so that at this area the condition of the mould sand can be checked.
  • the passage 50 is partly covered on the inner side by an agitator 51, which is pivotally fastened to the inner side of the drum wall by means of an axially directed pivotal shaft 52. With respect to the direction of rotation P1 the pivotal shaft 52 is arranged at the front of the flap- like agitator 51.
  • the width of the agitator 51 is smaller than the width of a passage 50, which ensures that sand can flow out via the flap 51 through the outlet opening 50 even if it is in the closed state as shown in fig. 11.
  • these spraying means 54 are divided into controllable sections, three of which are shown in fig. 1, so that it is possible to ensure the conditioning of the mould sand in each part of the drum.
  • the spray section of the spray means 54 associated with the passage 50 are then shut off.
  • the spray means can be automatically controlled by the monitoring means 53 through an electronic or electric circuitry (not shown).
  • Fig. 13 shows the outlet end of the drum 1, which end is mainly formed by a sieve wall 14.
  • This sieve wall has such a structure that the mould sand can be readily removed, whilst the castings remain in the drum. Thus the castings and mould sand are separated from one another.
  • a sand collecting member 60 consisting of an annular outer wall 61 and a closed wall 62 at the front, whereas the sand collecting member is open on the side directed to the rear.
  • blades 63 are arranged in any number; in this case they form each a quadrant.
  • the mould sand As soon as sand flows out at the beginning of the sieve wall 14 it is collected in the tray 60, carried along by the blades 63 and conducted back through the sieve wall 14 into the drum. Thus the mould sand is redistributed and is cooled by the continuous cooling air flow in the direction of the arrow P5 produced by the suction means 11 at the inlet opening 9. If the mould sand is too wet, it can also be additionally dried. the castings are caught by catching members 64 on the inner side of the sieve wall 14, the castings being moved through a given angle and dropped down. The impact of the castings will each time have a cleaning effect.
  • annular threshold 65 near the outlet opening of the drum prevents mould sand from emerging through the opening in the head face of the drum.
  • the products are finally shed by the catches 64 onto the beginning of the delivery belt 13 so that they can be conducted away.
  • the invention is not limited to the embodiment described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Devices For Molds (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Continuous Casting (AREA)
EP19820200677 1981-06-04 1982-06-02 Appareil pour traiter des moules en sable contenant plusieurs pièces coulées Expired EP0066931B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8102714 1981-06-04
NL8102714A NL8102714A (nl) 1981-06-04 1981-06-04 Inrichting voor het behandelen van een of meer gietstukken bevattende zandvormen.

Publications (2)

Publication Number Publication Date
EP0066931A1 true EP0066931A1 (fr) 1982-12-15
EP0066931B1 EP0066931B1 (fr) 1986-03-05

Family

ID=19837601

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820200677 Expired EP0066931B1 (fr) 1981-06-04 1982-06-02 Appareil pour traiter des moules en sable contenant plusieurs pièces coulées

Country Status (6)

Country Link
EP (1) EP0066931B1 (fr)
JP (1) JPS58371A (fr)
DE (1) DE3269594D1 (fr)
DK (1) DK161948C (fr)
ES (1) ES8307143A1 (fr)
NL (1) NL8102714A (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0326876A2 (fr) * 1988-02-05 1989-08-09 Dansk Industri Syndikat A/S Dispositif pour refroidir et décocher des pièces coulées dans des moules en sable
GB2238740A (en) * 1989-11-28 1991-06-12 Fischer Ag Georg Removing dust from used foundry sand scouring apparatus
US5095968A (en) * 1990-04-09 1992-03-17 Didion Manufacturing Co. Rotary media drum with cooling component
US5267603A (en) * 1993-01-19 1993-12-07 Didion Manufacturing Company Sand reclaiming drum with media recycler
AT402480B (de) * 1989-11-28 1997-05-26 Fischer Ag Georg Verfahren zur regenerierbehandlung von überwiegend tongebundenem giesserei-altsand
CN102794822A (zh) * 2012-09-07 2012-11-28 无锡锡通工程机械有限公司 干砂风冷装置
CN103342209A (zh) * 2013-07-09 2013-10-09 中联重科股份有限公司 出料箱以及干燥和分级设备
ITUA20164053A1 (it) * 2016-06-01 2017-12-01 Fonderia Ghirlandina Spa Impianto di distaffatura di getti da fonderia
CN109304420A (zh) * 2018-10-17 2019-02-05 禹州市昆仑模具有限公司 一种滚筒冷却筛

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2212708B2 (es) * 2002-02-27 2005-04-01 Urbar Ingenieros, S.A. Sistema de apoyo y rodadura para tambor desmoldeador en fundicion.
CN104226967A (zh) * 2014-08-20 2014-12-24 安徽新宁装备股份有限公司 一种翻模出球分向机
CN109590453A (zh) * 2018-12-10 2019-04-09 新晃远大机械铸造有限公司 一种铸件加工设备
CN109261944A (zh) * 2018-12-10 2019-01-25 新晃远大机械铸造有限公司 一种便于型砂收集的滚筒落砂机

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2523258A (en) * 1947-06-06 1950-09-19 Ransohoff Inc N Continuous feed tumbling mill
FR1179890A (fr) * 1956-08-24 1959-05-28 Smidth & Co As F L Supports pour fours et tambours rotatifs
DE2145607A1 (de) * 1971-09-13 1973-03-22 Krupp Gmbh Laufring fuer drehrohroefen, trockentrommeln od.dgl
GB1458567A (en) * 1973-07-16 1976-12-15 Expert Nv Cooling of castings and the cooling and drying of mould sand used for such castings
GB1506532A (en) * 1976-02-17 1978-04-05 Mec Fond Spa Devices for cooling castings and sand
FR2380095A1 (fr) * 1977-02-11 1978-09-08 Expert Nv Installation comprenant un tambour rotatif pour traiter des pieces moulees et du sable de moulage, pour les refroidir et/ou secher par exemple
GB1545152A (en) * 1976-10-19 1979-05-02 Expert Nv Rotatable drum drive
US4231414A (en) * 1977-05-27 1980-11-04 Wallwork C M G Handling foundry materials

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51996A (en) * 1974-06-20 1976-01-07 Mitsubishi Heavy Ind Ltd Tetsukozaichuno ganjutansoryono bunsekihoho
JPS5384617U (fr) * 1976-12-15 1978-07-12
JPS54157736A (en) * 1978-06-02 1979-12-12 Hosokawa Micron Kk Rotary vibrational tumbler
JPS5614068A (en) * 1979-07-16 1981-02-10 Sintokogio Ltd Wet type cooling method of casting

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2523258A (en) * 1947-06-06 1950-09-19 Ransohoff Inc N Continuous feed tumbling mill
FR1179890A (fr) * 1956-08-24 1959-05-28 Smidth & Co As F L Supports pour fours et tambours rotatifs
DE2145607A1 (de) * 1971-09-13 1973-03-22 Krupp Gmbh Laufring fuer drehrohroefen, trockentrommeln od.dgl
GB1458567A (en) * 1973-07-16 1976-12-15 Expert Nv Cooling of castings and the cooling and drying of mould sand used for such castings
GB1506532A (en) * 1976-02-17 1978-04-05 Mec Fond Spa Devices for cooling castings and sand
GB1545152A (en) * 1976-10-19 1979-05-02 Expert Nv Rotatable drum drive
FR2380095A1 (fr) * 1977-02-11 1978-09-08 Expert Nv Installation comprenant un tambour rotatif pour traiter des pieces moulees et du sable de moulage, pour les refroidir et/ou secher par exemple
US4231414A (en) * 1977-05-27 1980-11-04 Wallwork C M G Handling foundry materials

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0326876A3 (en) * 1988-02-05 1990-05-16 Dansk Industri Syndikat A/S An apparatus for cooling and stripping objects cast in sand moulds
EP0326876A2 (fr) * 1988-02-05 1989-08-09 Dansk Industri Syndikat A/S Dispositif pour refroidir et décocher des pièces coulées dans des moules en sable
GB2238740B (en) * 1989-11-28 1994-02-16 Fischer Ag Georg Sand treatment method and apparatus
GB2238740A (en) * 1989-11-28 1991-06-12 Fischer Ag Georg Removing dust from used foundry sand scouring apparatus
AT402480B (de) * 1989-11-28 1997-05-26 Fischer Ag Georg Verfahren zur regenerierbehandlung von überwiegend tongebundenem giesserei-altsand
US5095968A (en) * 1990-04-09 1992-03-17 Didion Manufacturing Co. Rotary media drum with cooling component
US5267603A (en) * 1993-01-19 1993-12-07 Didion Manufacturing Company Sand reclaiming drum with media recycler
CN102794822A (zh) * 2012-09-07 2012-11-28 无锡锡通工程机械有限公司 干砂风冷装置
CN103342209A (zh) * 2013-07-09 2013-10-09 中联重科股份有限公司 出料箱以及干燥和分级设备
CN103342209B (zh) * 2013-07-09 2015-09-30 中联重科股份有限公司 出料箱以及干燥和分级设备
ITUA20164053A1 (it) * 2016-06-01 2017-12-01 Fonderia Ghirlandina Spa Impianto di distaffatura di getti da fonderia
WO2017208151A1 (fr) * 2016-06-01 2017-12-07 Fonderia Ghirlandina Societa' Per Azioni Système de décochage pour des pièces moulées de fonderie
CN109304420A (zh) * 2018-10-17 2019-02-05 禹州市昆仑模具有限公司 一种滚筒冷却筛

Also Published As

Publication number Publication date
JPH0223263B2 (fr) 1990-05-23
ES512813A0 (es) 1983-06-16
DK251882A (da) 1982-12-05
JPS58371A (ja) 1983-01-05
EP0066931B1 (fr) 1986-03-05
NL8102714A (nl) 1983-01-03
DE3269594D1 (en) 1986-04-10
ES8307143A1 (es) 1983-06-16
DK161948C (da) 1992-02-03
DK161948B (da) 1991-09-02

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