WO1985004955A1 - Device and method for sampling a free falling flow of solid materials - Google Patents

Device and method for sampling a free falling flow of solid materials Download PDF

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Publication number
WO1985004955A1
WO1985004955A1 PCT/FR1985/000086 FR8500086W WO8504955A1 WO 1985004955 A1 WO1985004955 A1 WO 1985004955A1 FR 8500086 W FR8500086 W FR 8500086W WO 8504955 A1 WO8504955 A1 WO 8504955A1
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WO
WIPO (PCT)
Prior art keywords
chute
flow
roof
sampling
fall
Prior art date
Application number
PCT/FR1985/000086
Other languages
French (fr)
Inventor
Louis Bubenicek
Original Assignee
Société Nationale Elf Aquitaine (Production)
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 Société Nationale Elf Aquitaine (Production) filed Critical Société Nationale Elf Aquitaine (Production)
Publication of WO1985004955A1 publication Critical patent/WO1985004955A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/10—Devices for withdrawing samples in the liquid or fluent state
    • G01N1/20—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials

Definitions

  • the present invention relates to a sampler device for a flow of solid material in pieces in free fall and to a method of sampling by sampling of successive increments.
  • the sample of a batch of material must be taken in such a way as to faithfully represent the total batch according to standardized rules and it consists of a minimum number of elementary samples or increments.
  • the material brought to its point of fall for example by means of a conveyor in a chute formed by a conveyor belt, leaves the latter and pours into a vein or flow describing a parabolic trajectory.
  • the standardized sampling boards prescribe lower limit dimensions of the opening of the sampling box and the sample weight according to the particle size and the desired precision, the maximum speed of movement of the sampling box, as well as the number of increments taken according to the tonnage of material to be sampled.
  • the taking of a sample of a material in free fall is usually carried out by means of conventional so-called ferry samplers, in which an opening window with two parallel edges and respecting the standardized rules moves transversely relative to the section right of the material flow at a speed at most equal to 0.5 m / sec.
  • ferry samplers in which an opening window with two parallel edges and respecting the standardized rules moves transversely relative to the section right of the material flow at a speed at most equal to 0.5 m / sec.
  • the object of the present invention is to considerably reduce the quantity withdrawn, while retaining good representativeness of the batch.
  • the objective of the invention is achieved by means of a sampler device consisting of a chute or box provided on top of an opening and which is placed on a carriage moving transversely relative to the section. right of the falling flow, characterized in that said chute placed perpendicular to the material flow is covered with a protective plate or roof provided with an opening or mobile aperture, which plate is actuated by sliding in alternating directions along
  • the invention aims, independently of the device proposed, for any method of sampling solid matter in pieces leaving a conveyor in free fall by taking successive increments,
  • the chute is moved transversely relative to the falling flow, the window being during this movement out of reach of the material flow, the chute is stopped at fixed stops regularly spaced apart and, during these stops, the sliding window is traversed along the chute a distance corresponding to the thickness (y) of the fall flow, ie in the centripetal direction relative to at the focal point of the parabolic trajectory of the fall flow, that is to say in the direction of centrifuge relative to this focal point.
  • FIGS. 1a and 1b show the location and the shape of the increment taken from each thread of the vein in FIG. 2 the subdivision of the flow and withdrawal plan
  • Figure 3 schematically shows a side view of an embodiment of the device according to the invention
  • Figure 4 a top view of the same device
  • Figures 5 and 6 are perspective views, respectively, of the roof cou ⁇ smoothing at " wicket and full device
  • 3Q Figure 7 a perspective view of the entire installation.
  • the flow to be sampled is composed of material with a particle size such that 90% of pieces pass through a 50 mm mesh opening sieve.
  • the stream is discharged with a flow of 2400 t / hour and it measures 2 m in width and 50 cm in height.
  • the material flows in the form of an oblique flow 1 leaving a conveyor 2 carried by a head drum 3.
  • the sampler device comprises a chute 4 placed obliquely perpendicular to the flow 1. It is provided at the two lower and upper ends with two rollers 5 rolling on two horizontal rails
  • the chute 4 is also provided at both ends with nuts or en ⁇ grenages 19 integral with the chute, which cooperate with screws 11 por ⁇ as at their ends of the toothed wheels 9, one of which is rotated by means of a motor electric 10 can reverse the direction of rotation.
  • the rotational movement is transmitted to the other toothed wheels 9 by means of chains 8.
  • the chute 4 is covered with a protective roof 12 carrying on its two sides several pairs of rollers 13 each enclosing a guide rail 14 placed on each side at the upper ends of the chute 4.
  • Another drive system by chain is represented by the chain 15 placed obliquely parallel to the chute and fixed to the two longitudinal ends of the roof 12 and meshing on two toothed wheels 16, one of which is driven in rotation by means of a square rod
  • This system allows the roof 12 to slide in alternating directions along the trough 4.
  • the sliding roof 12 has in its middle part an opening or window 18.
  • the roof and its window can move thanks to the chain system 15 along the chute 4 and protect it over its entire course in the fall flow 1, the window 18 making it possible to divert an increment of material towards the chute.
  • This increment (30,31) will have occured within the vein before its removal the location presented in Figures 1a and 1b. Of length 1, it presents in profile an oblique shape, crossing the entire thickness of the vein, but only taking part of this thickness, which, in an instantaneous position of the window, is offset
  • Figure 2 shows a top view of a 2 m wide conveyor belt subdivided into eight 25 cm wide belts.
  • the gap between the edges of the aperture 18 is 200 mm, four times the size maximum number of pieces to sample.
  • the length of the strip shown corresponds to the transport of a load of 1000 t with a flow rate of 2400 t / hour, that is to say a load spilled in 25 minutes.
  • the standards prescribe the taking of sixteen increments per 1000 t of product. It is therefore sufficient to take two increments per virtual slice the ⁇ e strip or net to obtain a number of increments prescribed by the standard.
  • the chute 4 is made to move horizontally with stops at the eight stations corresponding to the eight 25 cm nets dividing the total width of the flow.
  • the roof 12 is positioned using the motor 10 so that the window 18 with a 20 cm square opening is out of reach of the material flow.
  • the mobile window 18 is moved using the motor 17 at a speed of 0.5 m / sec. perpendicular to the flow.
  • the height of the flow being 50 cm, the crossing of the box is accomplished in 1.4 sec.
  • the tonnage passing through the opening 18 is a percentage of the total variable flow and increasing from the edges towards the center .
  • the weight collected in 25 minutes of band flow is 253 kg and for a batch of weight varying between 1000 and 2400 t requiring 32 increments the weight collected is 506 kg, which is much lower than the sample weight collected during the use of TéchantiHonneur of the ferry type.
  • the sampling of 1000 t representing 25 minutes of band flow to take 16 increments it is necessary to carry out an elementary taking every 1.5 minutes. It is therefore possible to carry out this operation in 25 minutes, the crossing time being short compared to the sampling frequency.
  • the advantage of the method according to the invention does not only lie in the very significant reduction in the weight of sample taken in compliance with established standards. It also allows standards to be exceeded by allowing the opening of the sampling box to be greater than that fixed by the standards. In fact, the rules for ferry openings prescribe a width 2.5 times greater than the maximum size of the grains. To minimize the sample weight at the expense of the representativeness of the batch, the coefficient of 1.5 is often used. From the example of application described above, we have seen that by taking a coefficient of 4, therefore an oversized opening with regard to standardized rules, we are nevertheless led to sockets much lower than those of traversiêrs.
  • An opening of 200 mm respects the standards, even in the event of a disturbance in the granulometry which can lead to finding in the flow to be sampled blocks of 80 mm in diameter.
  • the invention is not limited to the device described, it also includes several variant embodiments which are easy to design for a person skilled in the art, such as, for example, various mechanical actuation devices for the movable members that are the chute and the protective roof.

Abstract

Device comprised of a chute (4) placed perpendicularly to and transversely sweeping the flow (1), and provided at both ends with two rollers (5) rolling on horizontal rails (6), the lower end of the chute leading into a sample collector (7). The chute (4) is covered by a protection roof (12) presenting an opening (18) and sliding in alternated directions along the chute (4). The chute is transversely displaced with respect to the flow, is stopped at the fixed stops and the protection roof is slid on a distance equal to the thickness of the flow. An important reduction of the collected sample weight, while respecting the sampling standards, is achieved.

Description

Dispositif et procédé d'échantillonnage d'un ux e ma res so es en chute libre.Device and method for sampling a flow in free fall.
La présente invention se rapporte à un dispositif échantillonneur pour un flux de matière solide en morceaux en chute libre et à un procédé d'échan¬ tillonnage par prélèvement d'incréments successifs.The present invention relates to a sampler device for a flow of solid material in pieces in free fall and to a method of sampling by sampling of successive increments.
L'échantillon d'un lot de matière doit être prélevé de façon à représenter fidèlement le lot total selon les régies normalisées et il est constitué par un nombre minimal d'échantillons élémentaires ou incréments. La matière amenée en son point de chute, par exemple au moyen d'un con¬ voyeur dans une goulotte constituée par une bande transporteuse, quitte celle-ci et se déverse dans une veine ou flux décrivant une trajectoire parabolique.The sample of a batch of material must be taken in such a way as to faithfully represent the total batch according to standardized rules and it consists of a minimum number of elementary samples or increments. The material brought to its point of fall, for example by means of a conveyor in a chute formed by a conveyor belt, leaves the latter and pours into a vein or flow describing a parabolic trajectory.
Les régies normalisées d'échantillonnage prescrivent des dimensions limites inférieures d'ouverture de la boite de prélèvement et le poids d'échantillon en fonction de la granulométrie et de la précision souhaitée, la vitesse maximale de déplacement de la boite de prélèvement, ainsi que le nombre d'incréments prélevés en fonction du tonnage de matière à échantillonner. La prise d'échantillon d'une matière en chute libre s'effectue habituelle¬ ment au moyen d'échantillonneurs classiques dits traversiers, dans lesquels une fenêtre d'ouvertureà deux bords parallèles et respectant les régies normalisées se déplace transversalement par rapport à la section droite du flux de matière à une vitesse au plus égale à 0,5 m/sec. Ainsi, pour une bande de transport large de 2 m débitant 2400 t/heure de matière de gra¬ nulométrie de 0-50 mm, on recueillera avec une fenêtre de 20 cm de largeur se déplaçant à 0,5 m/sec, à chaque passage un poids d'incrément de:The standardized sampling boards prescribe lower limit dimensions of the opening of the sampling box and the sample weight according to the particle size and the desired precision, the maximum speed of movement of the sampling box, as well as the number of increments taken according to the tonnage of material to be sampled. The taking of a sample of a material in free fall is usually carried out by means of conventional so-called ferry samplers, in which an opening window with two parallel edges and respecting the standardized rules moves transversely relative to the section right of the material flow at a speed at most equal to 0.5 m / sec. Thus, for a 2 m wide conveyor belt delivering 2400 t / hour of material with a grain size of 0-50 mm, we will collect with a 20 cm wide window moving at 0.5 m / sec, at each passing an increment weight of:
2400000 v 1 ,, , . 3600 x 77 = 266'7 kg' Le nombre d'incréments à prélever pour constituer un échantillon étant fixé à au moins 16 incréments parvtonnesde produit,le poids total de l'échan¬ tillon atteint des valeurs considérables, de l'ordre de 4267 kg. L'emploi des appareils de ce type conduit à des tailles d'échantillons nécessitant l'installation d'une tour de réduction lourde et coûteuse. La présente invention a pour objet de réduire considérablement la quantité prélevée, tout en conservant une bonne représentativité du lot. L'objectif de l'invention est atteint au moyen d'un dispositif échantil¬ lonneur constitué d'une goulotte ou boite pourvue sur le dessus d'une ouver¬ ture et qui est placée sur un chariot se déplaçant transversalement par rapport à la section droite du flux de chute, caractérisé en ce que ladite goulotte placée perpendiculairement au flux de matière est recouverte d'une plaque de protection ou toit muni d'une ouverture ou guichet mobile, laquelle plaque est actionnée en coulissement en sens alternés le long de2400000 v 1 ,,,. 3600 x 77 = 266 ' 7 kg ' The number of increments to be taken to constitute a sample being fixed at least 16 increments of product, the total weight of the sample reaches considerable values, of the order of 4267 kg. The use of devices of this type leads to sample sizes requiring the installation of a heavy and costly reduction tower. The object of the present invention is to considerably reduce the quantity withdrawn, while retaining good representativeness of the batch. The objective of the invention is achieved by means of a sampler device consisting of a chute or box provided on top of an opening and which is placed on a carriage moving transversely relative to the section. right of the falling flow, characterized in that said chute placed perpendicular to the material flow is covered with a protective plate or roof provided with an opening or mobile aperture, which plate is actuated by sliding in alternating directions along
- ; là goulotte au moyen d'organes mécaniques d'ent aine ent. Plus généralement, l'invention vise, indépendamment du dispositif propo¬ sé, tout procédé d'échantillonnage de matière solide en morceaux quittant en chute libre un convoyeur par prélèvement d'incréments successifs,- ; there chute by mechanical means of ent groin ent. More generally, the invention aims, independently of the device proposed, for any method of sampling solid matter in pieces leaving a conveyor in free fall by taking successive increments,
5 caractérisé en ce que, dans la succession d'incréments prélevés, la posi¬ tion de chaque incrément prélevé en position d'arrêt du dispositif est décalée par rapport à celle de l'incrément précédent selon Taxe hori¬ zontale (x) de la section droite du flux et l'incrément prélevé correspond à un filet de matière occupant un volume ayant un profil oblique selon5 characterized in that, in the succession of increments sampled, the position of each increment sampled in the device stop position is offset from that of the previous increment according to Hori¬ zontal tax (x) of the cross section of the flow and the increment taken corresponds to a thread of material occupying a volume having an oblique profile according to
10 le plan vertical perpendiculaire à la section droite du flux de chute. Ainsi, lors de l'application du procédé susvisé au moyen du dispositif présenté c -dessus, on déplace la goulotte transversalement par rapport au flux de chute, le guichet étant pendant ce déplacement hors d'atteinte du flux de matière, on arrête la goulotte à des arrêts fixes régulière- t5 ment espacés et on fait parcourir, lors de ces arrêts, au guichet coulis¬ sant le long de la goulotte une distance correspondante à l'épaisseur (y) du flux de chute, soit en direction centripète par rapport au foyer de la trajectoire parabolique du flux de chute, soit en direction centri¬ fuge par rapport à ce foyer.10 the vertical plane perpendicular to the cross section of the fall flow. Thus, during the application of the abovementioned method by means of the device presented above, the chute is moved transversely relative to the falling flow, the window being during this movement out of reach of the material flow, the chute is stopped at fixed stops regularly spaced apart and, during these stops, the sliding window is traversed along the chute a distance corresponding to the thickness (y) of the fall flow, ie in the centripetal direction relative to at the focal point of the parabolic trajectory of the fall flow, that is to say in the direction of centrifuge relative to this focal point.
2Q D'autres particularités de l'invention apparaitront à la lumière de la description de dessins annexes, dont les figures 1a et 1b montrent l'emplacement et la forme de l'incrément prélevé dans chaque filet de la veine la figure 2 la subdivision du flux et le plan de prélèvement2Q Other features of the invention will appear in the light of the description of the accompanying drawings, of which FIGS. 1a and 1b show the location and the shape of the increment taken from each thread of the vein in FIG. 2 the subdivision of the flow and withdrawal plan
25 la figure 3 présente schématiquement une vue de côté d'un mode de réalisation du dispositif selon l'invention, la figure 4 une vue de dessus du même dispositif, les figures 5 et 6 des vues en perspective, respectivement, du toit cou¬ lissant à"guichet et du dispositif complet, etFigure 3 schematically shows a side view of an embodiment of the device according to the invention, Figure 4 a top view of the same device, Figures 5 and 6 are perspective views, respectively, of the roof cou¬ smoothing at " wicket and full device, and
3Q la figure 7 une vue en perspective de toute l'installation.3Q Figure 7 a perspective view of the entire installation.
Dans le cas considéré, le flux à échantillonner est composé de matière de granulométrie telle, que 90% de morceaux passent à travers un tamis d'ouverture de mailles de 50 mm. Le flux est déversé avec un débit de 2400 t/heure et il mesure 2 m de largeur et 50 cm de hauteur.In the case under consideration, the flow to be sampled is composed of material with a particle size such that 90% of pieces pass through a 50 mm mesh opening sieve. The stream is discharged with a flow of 2400 t / hour and it measures 2 m in width and 50 cm in height.
35- La matière s'écoule sous forme d'un flux oblique 1 en quittant un convoyeur 2 porté par un tambour de tête 3.35- The material flows in the form of an oblique flow 1 leaving a conveyor 2 carried by a head drum 3.
Le dispositif échantiHonneur comprend une goulotte 4 placée en oblique perpendiculairement au flux 1. Elle est munie aux deux extrémités infé¬ rieure et supérieure de deux galets 5 roulant sur deux rails horizontauxThe sampler device comprises a chute 4 placed obliquely perpendicular to the flow 1. It is provided at the two lower and upper ends with two rollers 5 rolling on two horizontal rails
40 parallèles 6. L'extrémité inférieure de la goulotte débouche dans un collecteur éc ant on .40 parallels 6. The lower end of the chute leads into a collector screen.
La goulotte 4 est également munie aux deux extrémités des écrous ou en¬ grenages 19 solidaires de la goulotte, qui coopèrent avec des vis 11 por¬ tant à leurs extrémités des roues dentées 9, dont une est entrainée en rotation au moyen d'un moteur électrique 10 pouvant inverser le sens de rotation. Le mouvement de rotation est transmis aux autres roues dentées 9 au moyen de chainés 8. Ainsi, les roues dentées 9 entrainant deux vis 11 coopérant avec des écrousThe chute 4 is also provided at both ends with nuts or en¬ grenages 19 integral with the chute, which cooperate with screws 11 por¬ as at their ends of the toothed wheels 9, one of which is rotated by means of a motor electric 10 can reverse the direction of rotation. The rotational movement is transmitted to the other toothed wheels 9 by means of chains 8. Thus, the toothed wheels 9 driving two screws 11 cooperating with nuts
19 solidaires de la goulotte 4 assurent le déplacement de la goulotte en translation de sens alternés en direction horizontale pour lui permettre de balayer transversalement le flux 1.19 integral with the chute 4 ensure the displacement of the chute in translation of alternating directions in the horizontal direction to allow it to sweep transversely the flow 1.
La goulotte 4 est recouverte d'un toit de protection 12 portant à ses deux côtés plusieurs couples de galets 13 enserrant chacun un rail de guidage 14 placé de chaque côté aux extrémités supérieures de la goulotte 4. Un autre système d'entrainement par chaine est représenté par la chaine 15 placée en oblique parallèlement à la goulotte et fixée aux deux extrémités longitudinales du toit 12 et s'engrenant sur deux roues dentées 16, Tune desquelles est entrainée en rotation par l'intermédiaire d'une tige carréeThe chute 4 is covered with a protective roof 12 carrying on its two sides several pairs of rollers 13 each enclosing a guide rail 14 placed on each side at the upper ends of the chute 4. Another drive system by chain is represented by the chain 15 placed obliquely parallel to the chute and fixed to the two longitudinal ends of the roof 12 and meshing on two toothed wheels 16, one of which is driven in rotation by means of a square rod
20 apte à assurer un coulisse ent transversal des roues dentées 16 par un moteur 17.20 capable of ensuring a transverse ent slide of the toothed wheels 16 by a motor 17.
Ce système permet le coulissement en sens alternés du toit 12 le long de la goulotte 4.This system allows the roof 12 to slide in alternating directions along the trough 4.
Le toit coulissant 12 présente dans sa partie médiane une ouverture ou guichet 18. Le toit et son guichet peuvent se déplacer grâce au système de chaine 15 le long de la goulotte 4 et la protéger sur l'intégralité de son parcours dans le flux de chute 1, le guichet 18 permettant de détour¬ ner vers la goulotte un incrément de matière. Cet incrément (30,31) aura occu au sein de la veine avant son prélèvement l'emplacement présenté aux figures 1a et 1b. De longueur 1, il présente de profil une forme oblique, traver- sant toute l'épaisseur de la veine, mais ne prélevant qu'une partie de cette épaisseur, qui, dans une position insta.nt.anée du .guichet, est décaléeThe sliding roof 12 has in its middle part an opening or window 18. The roof and its window can move thanks to the chain system 15 along the chute 4 and protect it over its entire course in the fall flow 1, the window 18 making it possible to divert an increment of material towards the chute. This increment (30,31) will have occured within the vein before its removal the location presented in Figures 1a and 1b. Of length 1, it presents in profile an oblique shape, crossing the entire thickness of the vein, but only taking part of this thickness, which, in an instantaneous position of the window, is offset
^. , , par rapport à sa positioni Dr çffdente.. selon Taxe vertical (y)"de la section droite du fluxv Selon que le mouve¬ ment du guichet s'opère vers le haut ou vers le bas, la pente du profil oblique s'inverse, de direction centripète elle devient centrifuge. La position de la goulotte, les dimensions du guichet et la vitesse de déplacement sont des données dépendantes de caractéristiques de la matière à échantillonner et de la précision demandée. ^ . ,, in relation to its position Dr çffdente .. according to vertical tax (y) " of the right section of the fluxv Depending on whether the movement of the window takes place up or down, the slope of the oblique profile s' conversely, in the centripetal direction it becomes centrifugal.The position of the chute, the dimensions of the window and the speed of movement are data dependent on the characteristics of the material to be sampled and the precision required.
La figure 2 représente, vue de dessus, une bande de transport de 2 m de largeur subdivisée en huit bandes de 25 cm de largeur. L'écartement des bords de l'ouverture du guichet 18 est de 200 mm, le quadruple de la grosseur maximum de morceaux à échantillonner.Figure 2 shows a top view of a 2 m wide conveyor belt subdivided into eight 25 cm wide belts. The gap between the edges of the aperture 18 is 200 mm, four times the size maximum number of pieces to sample.
La longueur de la bande représentée correspond au transport d'une charge de 1000 t avec un débit de 2400 t/heure, c'est à dire une charge déversée en 25 minutes. Les normes prescrivent la prise de seize incréments par 1000 t.de produit. Il suffit donc de prélever deux incréments par tranche virtuel le αe bande ou filet pour obtenir un nombre d'incréments prescrit par la norme.The length of the strip shown corresponds to the transport of a load of 1000 t with a flow rate of 2400 t / hour, that is to say a load spilled in 25 minutes. The standards prescribe the taking of sixteen increments per 1000 t of product. It is therefore sufficient to take two increments per virtual slice the αe strip or net to obtain a number of increments prescribed by the standard.
On fait déplacer horizontalement la goulotte 4 avec arrêts aux huit stations correspondant aux huit filets de 25 cm subdivisant la largeur to¬ tale du flux. Lors du déplacement de la goulotte, le toit 12 est positionné à l'aide du moteur 10 de façon à ce que la fenêtre 18 d'ouverture carrée de 20 cm de côté soit hors d'atteinte du flot de matière. A l'arrêt, on fait déplacer le guichet mobile 18 à Taide du moteur 17 à une vitesse de 0,5 m/sec. perpendiculairement au flux. La hauteur du flux étant de 50 cm, la traversée de la boite s'accomplit en 1,4 sec. Suivant la position de la goulotte dans un des couloirs tracés à la figure 2, c'est à dire suivant sa position dans le flux, le tonnage passant dans l'ouverture 18 est un pourcentage du flux total variable et croissant des bords vers le centre. Pour le débit considéré de 2400 tyheure, ce flot passe de 0 à 115 kg/sec. pour la totalité de la veine. L'ouverture du guichet coupant chaque filet en 1/2,5 sec, l'incrément recueilli pour chaque filet varie de 0 à 115/2-,5 = 46 kg, en moyenne environ 15 kg par incrément.The chute 4 is made to move horizontally with stops at the eight stations corresponding to the eight 25 cm nets dividing the total width of the flow. When the chute is moved, the roof 12 is positioned using the motor 10 so that the window 18 with a 20 cm square opening is out of reach of the material flow. When stopped, the mobile window 18 is moved using the motor 17 at a speed of 0.5 m / sec. perpendicular to the flow. The height of the flow being 50 cm, the crossing of the box is accomplished in 1.4 sec. Depending on the position of the chute in one of the corridors plotted in Figure 2, that is to say according to its position in the flow, the tonnage passing through the opening 18 is a percentage of the total variable flow and increasing from the edges towards the center . For the considered flow of 2400 tyhours, this flow goes from 0 to 115 kg / sec. for the entire vein. The opening of the window cutting each fillet in 1 / 2.5 sec, the increment collected for each fillet varies from 0 to 115 / 2-, 5 = 46 kg, on average about 15 kg per increment.
Au total, pour un lot de 1000 t déversé avec un débit de 2400 t/heure, exigeant selon la réglementation le prélèvement des 16 incréments, le poids recueilli en 25 minutes de débit de la bande est de 253 kg et pour un lot de poids variant entre 1000 et 2400 t exigeant 32 incréments le poids recueilli est de 506 kg, ce qui est nettement inférieur au poids d'échan¬ tillon recueilli lors de l'emploi de TéchantiHonneur du type traversier. L'échantillonnage de 1000 t représentant 25 minutes de débit de la bande, pour prélever 16 incréments il faut effectuer un prélèvement élémentaire toutes les 1,5 minutes. Il est donc possible de réaliser cette opération en 25 minutes,, le temps de traversée étant faible en regard de la fréquence de prélèvement.In total, for a batch of 1000 t spilled with a flow rate of 2400 t / hour, requiring according to the regulations the taking of 16 increments, the weight collected in 25 minutes of band flow is 253 kg and for a batch of weight varying between 1000 and 2400 t requiring 32 increments the weight collected is 506 kg, which is much lower than the sample weight collected during the use of TéchantiHonneur of the ferry type. The sampling of 1000 t representing 25 minutes of band flow, to take 16 increments it is necessary to carry out an elementary taking every 1.5 minutes. It is therefore possible to carry out this operation in 25 minutes, the crossing time being short compared to the sampling frequency.
L'avantage du procédé selon l'invention ne réside pas seulement dans la réduction très importante du poids d'échantillon prélevé dans le respect de normes établies. Il -permet également de dépasser les normes en auto¬ risant une ouverture de la boite de prélèvement supérieure à celle fixée par les normes. En effet, les régies pour les ouvertures des traversiers prescrivent une largeur 2,5 fois supérieure à la grosseur maximale des grains. Pour minimiser le poids d'échantillon au détriment de la représen¬ tativité du lot, on utilise souvent le coefficient de 1,5. De l'exemple d'application décrit ci-dessus, on a vu qu'en prenant un coef¬ ficient de 4, donc une ouverture surdimensionnée au regard de régles_nor- __ malisées, on est conduit néanmoins à des prises très inférieures à celles de traversiêrs. Une ouverture de 200 mm respecte les normes, même en cas d'une perturbation de la granulométrie pouvant conduire à trouver dans le flux à échantillonner des blocs de 80 mm de diamètre. L'invention n'est pas limitée au dispositif décrit, elle comprend égale- ment plusieurs variantes de réalisation faciles.à concevoir pour un homme de métier, telles que par exemple des différents dispositifs d'actionnement mécanique des organes mobiles que sont la goulotte et le toit de protection. The advantage of the method according to the invention does not only lie in the very significant reduction in the weight of sample taken in compliance with established standards. It also allows standards to be exceeded by allowing the opening of the sampling box to be greater than that fixed by the standards. In fact, the rules for ferry openings prescribe a width 2.5 times greater than the maximum size of the grains. To minimize the sample weight at the expense of the representativeness of the batch, the coefficient of 1.5 is often used. From the example of application described above, we have seen that by taking a coefficient of 4, therefore an oversized opening with regard to standardized rules, we are nevertheless led to sockets much lower than those of traversiêrs. An opening of 200 mm respects the standards, even in the event of a disturbance in the granulometry which can lead to finding in the flow to be sampled blocks of 80 mm in diameter. The invention is not limited to the device described, it also includes several variant embodiments which are easy to design for a person skilled in the art, such as, for example, various mechanical actuation devices for the movable members that are the chute and the protective roof.

Claims

REVENDICATIONS. CLAIMS.
1. Dispositif échantillonneur pour un flux de matières solides en morceaux en chute libre quittant un engin convoyeur, lequel dispositif est consti¬ tué d'une goulotte ou boite (4) pourvue sur le dessus d'une ouverture (18) et qui est placée sur un chariot (5,6) se déplaçant transver- salement par rapport à la section droite du flux de chute (1), carac¬ térisé en ce que ladite goulotte (4) placée perpendiculairement au flux (1) de matières est recouverte d'une plaque de protection ou d'un toit (12) muni d'une ouverture ou d'un guichet mobile (18), laquelle plaque est actionnée en coulissement de sens alternés le long de la goulotte au moyen d'organes mécaniques d1entrainement (15,16,17).1. Sampling device for a flow of solid matter in free falling pieces leaving a conveyor machine, which device is made up of a chute or box (4) provided on top of an opening (18) and which is placed on a carriage (5,6) moving transversely relative to the cross section of the fall flow (1), charac¬ terized in that said chute (4) placed perpendicular to the flow (1) of materials is covered with '' a protective plate or a roof (12) provided with an opening or a mobile window (18), which plate is actuated by sliding in alternating directions along the chute by means of mechanical members d 1 training (15,16,17).
2. Dispositif selon la revendication 1, caractérisé en ce que le toit cou¬ lissant (12) est muni à ses deux côtés de galets (13) roulant sur deux rails de guidage (14) placés le long des deux côtés de la goulotte (4).2. Device according to claim 1, characterized in that the cou¬ smoothing roof (12) is provided at its two sides with rollers (13) rolling on two guide rails (14) placed along both sides of the chute ( 4).
3. Dispositif selon la revendication 1, caractérisé en ce que le coulisse- ment du toit (12) le long de la goulotte (4) est assuré par une chaine3. Device according to claim 1, characterized in that the sliding of the roof (12) along the chute (4) is ensured by a chain
(15) s'engrenant sur des roues dentées (16) entrainées en rotation par un moteur (17), les deux extrémités de la chaine (15) étant fixées aux deux extrémités longitudinales du toit (12).(15) meshing with toothed wheels (16) driven in rotation by a motor (17), the two ends of the chain (15) being fixed to the two longitudinal ends of the roof (12).
4. Dispositif selon la revendication 1, caractérisé en ce que le déplace- ment horizontal de la goulotte (4) est assuré par deux vis sans fin (11) entrainées en rotation par un moteur (10) et coopérant avec des écrous ou engrenages (19) fixés aux deux extrémités de la goulotte (4). 4. Device according to claim 1, characterized in that the horizontal movement of the chute (4) is ensured by two endless screws (11) driven in rotation by a motor (10) and cooperating with nuts or gears ( 19) attached to the two ends of the chute (4).
5.. Procédé d'échantillonnage d'une matière solide en morceaux quittant en chute libre un convoyeur par prélèvement des incréments successifs de matière, caractérisé en ce que, dans la succession des incréments prélevés, la position de chaque incrément prélevé en position d'arrêt du dispositif est décalée par rapport à celle de l'incrément précédent selon Taxe horizontal (x) de la section droite du flux et que l'in¬ crément prélevé correspond à un filet de matière occupant un volume ayant un profil oblique selon le plan vertical perpendiculaire à la section droite du flux de chute. 5 .. A method of sampling solid material into pieces leaving a free fall conveyor by taking successive increments of material, characterized in that, in the succession of increments taken, the position of each increment taken in position device stop is offset from that of the previous increment according to horizontal tax (x) of the cross section of the flow and that the increment taken corresponds to a thread of material occupying a volume having an oblique profile according to the plane vertical perpendicular to the cross section of the fall flow.
6. Procédé selon la revendication 5 pour la mise en oeuvre du dispositif selon Tune des revendications 1 à 4, caractérisé en ce qu'on déplace la goulotte transversalement par rapport au flux de chute, le guichet étant pendant ce déplacement hors d'atteinte du flux de chute, on arrête la goulotte à des arrêts fixes régulièrement espacés et on fait parcourir, lors de ces arrêts, au guichet coulissant le long de la goulotte une distance correspondante à l'épaisseur du flux de chute (y). 6. Method according to claim 5 for the implementation of the device according to one of claims 1 to 4, characterized in that the chute is moved transversely relative to the falling flow, the window being during this movement out of reach of the fall flow, the chute is stopped at regularly spaced fixed stops and, during these stops, the window sliding along the chute is traversed a distance corresponding to the thickness of the fall flow (y).
PCT/FR1985/000086 1984-04-17 1985-04-16 Device and method for sampling a free falling flow of solid materials WO1985004955A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8406072A FR2563005B1 (en) 1984-04-17 1984-04-17 DEVICE AND METHOD FOR SAMPLING A FLOW OF SOLID MATERIAL IN A FREE FALL
FR84/06072 1984-04-17

Publications (1)

Publication Number Publication Date
WO1985004955A1 true WO1985004955A1 (en) 1985-11-07

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EP (1) EP0176583A1 (en)
AU (1) AU4218685A (en)
FR (1) FR2563005B1 (en)
WO (1) WO1985004955A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2743887B1 (en) * 1996-01-23 1998-02-13 Renault INSTALLATION FOR THE SAMPLING OF SAMPLES FROM A MATERIAL FLOW

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1890199A (en) * 1926-03-01 1932-12-06 Thorsten Thorleif Method and apparatus for sampling material
FR2212038A5 (en) * 1972-12-23 1974-07-19 Simonacco Ltd
US3875803A (en) * 1972-09-20 1975-04-08 Birtley Eng Ltd Equipment for sampling bulk material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1890199A (en) * 1926-03-01 1932-12-06 Thorsten Thorleif Method and apparatus for sampling material
US3875803A (en) * 1972-09-20 1975-04-08 Birtley Eng Ltd Equipment for sampling bulk material
FR2212038A5 (en) * 1972-12-23 1974-07-19 Simonacco Ltd

Also Published As

Publication number Publication date
FR2563005B1 (en) 1986-06-20
EP0176583A1 (en) 1986-04-09
FR2563005A1 (en) 1985-10-18
AU4218685A (en) 1985-11-15

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