EP1446324B1 - System for injecting at least two products into containers - Google Patents

Abstract

The invention concerns a product transport line (LT) having an inlet (E) designed to be selectively connected to a first or a second product supply source (16A, 16B) and an outlet (S) through which the transported product can be injected towards containers (12): It further comprises a station for inserting (20) a separating member, arranged proximate to the inlet (E) of the transport line (LT) and designed to insert into said line a separating member capable of isolating one from the other the two products transported in the line on either side of said member when said member is itself transported in the line, and a station for evacuating (22) said separating member arranged proximate to the outlet (S) of the transport line and adapted to evacuate the separating member from said line.

Description

The present invention relates to an injection system of at least two produced in containers, including a product transport line having an input capable of being selectively connected to a first or to a second product feed and an output by which the product transported can be injected into containers.

In general, such an injection system is connected to a container filling system, on which the receptacles are advanced step by step to park under a filling station connected to the injection system so as to allow their filling. Downstream of this station, the containers are usually closed with a lid by example, heat sealed. The installation can be used to fill containers prefabricated, or it can be used to make containers in one or several manufacturing stations, in particular by thermoforming, and to fill these receptacles in a filling station located downstream from manufacturing.

Typically, the product transport line serves to bring you product to the filling station, in which the product is dosed and delivered in the containers. The product to be injected into the containers is usually initially stored in a tank which, for reasons practical, is normally located at a relatively large distance from the container filling installation. In particular, it is important to easily bring full tanks and remove empty tanks without enter the perimeter of the filling plant. So, the tank is connected to a pump which delivers the product in the transmission line, which itself transports the product to the filling station of the containers, located on the installation.

In such an installation, it obviously happens that we have to change the type of product with which the containers are filled. In particular, when the receptacles are intended to contain a liquid or pasty product of the like yoghurt, it is quite common that it is necessary to change the scent yogurt. In such a case, most of the time, a main tank containing the basic product, called the white mass, is connected to the filling station in a suitable way. Depending on the type of perfume chosen, a additive product is brought by the transport line so as to be mixed with the white mass in the filling station or just upstream of the latter, before the mixture is introduced into the containers. For change perfume, we keep the same white mass, but we modify the additive. Thus, with conventional systems, one can have several tanks each containing a particular type of additive so as to be able to connect them selectively to the input of the transmission line, by one or several pumps.

In conventional systems, when, from a situation in which the transport line carried a first product, for example a first additive, we wanted to change product to deliver a second, for example a second additive, one isolated the entry of the line of transport of food first product to connect it to food second product, then we inject that second product into the line of transport. As a result, the two products were mixed in the line of transport before reaching the filling plant for the receptacles and, to avoid this mixture being found in the containers, it was necessary to stop fill the containers and eliminate a corresponding amount of product practically to the total volume of the transmission line before starting the filling the containers using the second product.

As mentioned above, since for reasons of practical, the transmission line is relatively long, this necessary elimination concerned a relatively large volume of product, and therefore generated significant losses. These losses affected the cost price and resulted in a reluctance to change the type of product injected into the containers.

For a very particular application, which is that of the transport of petroleum products, GB 1 028 035 discloses an injection system of the type aforementioned and further comprising an organ introduction station separator, arranged in the vicinity of the entrance of the transmission line and adapted to to introduce into said line a separating member capable of isolating one from the other the two products transported in the line on either side of the said organ when this organ is itself transported in the line.

When changing the transported product, the divider must be brought back to a trap located near the entrance of the transmission line, under the effect of the thrust exerted on him the second product. This use of the second product to transport the separator member to a long distance is not always possible, especially when concerned products are food products. It requires a interruption of the product distribution because the outlet valve of the line of the transport is closed until the separating element reaches its trap.

The aim of the invention is to improve this state of the art by proposing a system which makes it easy to change the product transported in the line of transport, without causing significant product losses.

This goal is achieved thanks to the fact that the injection system according to the invention comprises an evacuation station of the separating member disposed at neighborhood of the exit of the transmission line and able to evacuate the organ separator of said line.

Thanks to the invention, when, from a situation in which one inject a first product, we want to change it to inject a second, the separator element is introduced into the transport line and then isolates the input of the latter from the first power supply by connecting it to the second food. So we inject the second product upstream of the separator and it is separated from the first product that circulates in downstream. When the divider reaches the vicinity of the exit of the line transport, that is to say in the vicinity of the filling station of the containers, it can be removed from the line to inject the second product to the place the first in this filling station.

When the feeding of the second product begins, the organ separator is naturally pushed into the transport line by this second product, and he just pushes in front of him the first product, which is routed quite normal until the exit of the line of transport.

Advantageously, the injection system comprises, in addition, a line return able to bring back to the station of introduction the separating organ evacuated from the transmission line by the evacuation station.

Thus, the separating element evacuated from the transmission line at the exit of the latter is brought back to the introductory position, to be disposed of new in the latter, waiting for a new product change at which the separator will be introduced again in the line transport.

It is also advantageous that the system includes a washing suitable for washing the separating member before the introduction of the latter in the transport line by the introductory post.

This washing makes it possible to respect strict hygienic conditions, especially when the products are food products.

According to an advantageous embodiment, the system comprises a device for loading or unloading the separating member presents a product passage forming a section of the transmission line and a charging member comprising at least one chamber adapted to contain a separating member between its two open ends, said loader member being movable between a first position in which said chamber is interposed in said product passage so that the separating member content in this room can be driven by the product flow in the transmission line and a second position in which the said room is spaced apart from said product passage.

The injection system may comprise two loading devices or similar unloading arranged, one in the introductory station, to be used to load one separator and the other into the post discharge, for discharging the separating member.

In the introductory station, the divider can be set up in the room of the loader member while the latter is in its second position, without interfering with the transport of the product. When you want to change the product, just put in its first position the chamber containing the separator, and this one comes automatically set up in the transport line.

In the evacuation station, the chamber of the charging unit is placed in her first position, in which she is interposed in the passage of product. Thus, the separating organ comes naturally to lodge in this when, under the effect of the transport of the products, it reaches the evacuation station. He is then detained in this room and, in order to continue the transport of products, just place the charger in its second position, removing the chamber from the product passage. The product which was located downstream of the separating member can then be issued at the exit of the transmission line.

• la figure 1 est un schéma montrant l'organisation générale du système d'injection conforme à l'invention ;
• la figure 2 est une vue en perspective, avec un arrachement, montrant un dispositif de chargement ou de déchargement d'organe séparateur conforme à l'invention ;
• la figure 3 est une vue en coupe dans le plan III-III de la figure 2, montrant la position de travail du dispositif de chargement ou de déchargement ;
• la figure 4 est une vue analogue à la figure 3, montrant la position de lavage ;
• la figure 5 est une coupe perpendiculaire à celle des figures 3 et 4, selon la ligne V-V de la figure 4 ;
• la figure 6 est une vue en coupe du poste de lavage dans un plan contenant la direction de déplacement de l'organe séparateur dans ce poste ; et
• la figure 7 est une vue en coupe selon la ligne VII-VII de la figure 6.

The invention will be better understood and its advantages will appear better on reading the detailed description which follows, of an embodiment shown by way of non-limiting example. The description refers to the accompanying drawings, in which:

• Figure 1 is a diagram showing the general organization of the injection system according to the invention;
• Figure 2 is a perspective view, with a tear, showing a device for loading or unloading separator member according to the invention;
• Figure 3 is a sectional view in the plane III-III of Figure 2, showing the working position of the loading or unloading device;
• Figure 4 is a view similar to Figure 3, showing the washing position;
• Figure 5 is a section perpendicular to that of Figures 3 and 4, according to the line VV of Figure 4;
• Figure 6 is a sectional view of the washing station in a plane containing the direction of movement of the separator member in this position; and
• Figure 7 is a sectional view along the line VII-VII of Figure 6.

The system of FIG. 1 serves to bring the product, for example a liquid or pasty product such as yogurt or the like, to a station in which this product is delivered in containers 12 which are brought under this station. For example, the product delivered in station 10 results from the mixing of several products. This mixture comprises a basic product or white mass, initially contained in a main tank R, as well as an additive, from a tank RA or RB and mixed with the white mass in a blender 14, before being injected into the dosing station. For example, the white mass may be plain yoghurt, while additives contained in RA or RB tanks can be fruit extracts from two different species.

In the example of FIG. 1, the injection system makes it possible to change the additive in the white mass, without losing a large volume of additive during of this change. The system includes a LT product line whose input E can be connected selectively to a first or to a second power supply 16A or 16B, and whose output S allows the injection of product transported in this line to the dosing and filling station 10. In this case, this output is connected to the mixer 14, to allow the mixture of the additive with the white mass.

The tanks R, RA and RB are arranged at a distance from the station of metering and filling 10, so that the LT transport line, likewise that the line LB which connects the tank R to the mixer 14, are long. In production, we rarely change the white mass, so that the LB line remains permanently connected to the tank R and to the mixer 14. In However, we may wish to change the added additive in this white mass, connecting one or the other RA or RB tanks to the transmission line.

In the example shown, the outlet of the reservoir RA and that of the reservoir RB are connected to the respective power supplies 16A and 16B by means of a pumps 18A, 18B. The power supplies 16A and 16B are connected in parallel to the input E of the transport line LT, each via a valve, respectively VA and VB. Depending on whether they are open or closed, these valves allow the selective connection of the power supply 16A or 16B to the line LT. Purge lines, respectively 17A and 17B, themselves equipped with valves, allow to purge the power supplies 16A and 16B.

The injection system according to the invention comprises a station of introduction 20 which is arranged in the vicinity of the entrance of the line of transport LT and which makes it possible to introduce into the latter an organ separator as described below. In the vicinity of exit S of the LT line, the system includes an evacuation station 22 which can evacuate this separator organ. So, along the entire length of the LT transport line located between the stations 20 and 22, the separating unit can isolate one from the other the products located respectively downstream and upstream of this organ.

The evacuation station is located on the transmission line, but at immediate vicinity of the exit of the latter, while the post of introduction is also arranged on this line, but in the neighborhood immediate entry.

The system further includes a return line LR which allows bring back to the introduction station 20 the separating member removed from the line transport by the evacuation station 22. This return line includes a first end 24A, which is connected to the evacuation station 22 and through which can be introduced a transport fluid such as water, as well as a second end 24B, which is connected to the insertion station 20, and by which one can bring out this transport fluid. So when the organ separator reaches the evacuation station 22, the latter places it in the return line and the divider is conveyed to the post of introduction by the fluid that enters the return line by its end 24A.

The system further comprises a washing station 26 in which the organ separator can be washed before being reintroduced into the introduction station. As can be seen in Figure 1, it is extremely advantageous for this post washing is on the LR return line. In this case, we can use as the washing fluid the transport fluid entering this line by its entrance 24A.

With reference to FIGS. 2 to 5, a device for loading or unloading separator 28 which, depending on the of which it is connected to the lines LT and LR, can form the introductory station 20 or the evacuation station 22.

Thus, the device 28 comprises two first end pieces of connection, 30A and 30B, and two second end pieces, 32A and 32B. For example, the device 28 forms the evacuation station 22 and the tip 30A is connected to the transmission line, upstream of the evacuation station, while the tip 30B is connected to the output S. In the same situation, the tip 32B is connected to the supply 24A of the return line, and the tip 32A is connected to the return line, downstream from the station 22 in the direction of circulation of the transport fluid in this line.

The device 28 can also form the insertion station 20, in which case the tip 32B is connected to the input E of the line LT, upstream of the post 20, while the end pieces 30A and 30B are connected to the return line LR, respectively upstream and downstream of the station 20 in the direction of circulation of the transport fluid in this line.

Thus, the end pieces 30A and 30B on the one hand and the end pieces 32A and 32B on the other hand form the ends of a first and a second channel arranged in the device 28. Depending on whether the tips are connected to the LT or LR lines, the first and second channels respectively form a section of the LR line and a section of the LT line, or vice versa.

The following is the description of the first situation in which the device 28 forms the evacuation station 22. Between the end pieces 30A and 30B, the device 28 shows a product passage 32 which forms a section of the line of LT transport. Between the end pieces 32A and 32B, the device 28 presents a return passage 34 which forms a section of the return line LR. As as can be seen in FIG. 3, the device 28 comprises a loader member 36 which has two rooms, respectively 38 and 40, able to contain a separating member 42 between their open ends, respectively 38A, 38B and 40A, 40B.

In the position shown, the separating member 42 is retained in the chamber 38 through retaining means that the latter. Thus, the end 38B of this chamber which is located downstream in the direction transporting the product in the product passage 32 has a stop 39 which delimits a section smaller than that of the separating which abuts said organ. In general, the charging unit comprises means for retaining the separating member 42 in the chamber, these means authorizing the entry of said separating member into this chamber and the exit of this organ out of this chamber only by one of its ends 38A. The conformation of the chamber 40 is identical to that of the chamber 38.

When the device 28 belongs to the introductory station, the chamber 38 can receive the separating member 42 when it is in its second position, which is thus a waiting position. When the device 28 belongs at the evacuation station, it is when it occupies its first position that the Chamber 38 awaits the separator.

Figures 2 and 3 thus show the chamber 38 in its first position in which it is interposed in the product passage 32. understands that when the separator 42 is in the line of transport, it is driven by the flow of products flowing in this line until he comes to stay in room 38, where he is detained by means 39 mentioned above. The charging member 36 can then be ordered to occupy its second position, in which the room 38 is located outside the product passage, to allow this product to flow freely to the tip 30B.

In this second position, the chamber 38 is disposed in the passage 34, instead of the chamber 40 visible in FIG. fluid flow direction R in the passageway 34 is the opposite of the direction of transport of product in passage 32. Consequently, under the effect of transport fluid supplied by the tip 32B, the separating member 42 can leave the end 38A of the chamber 38 when the latter communicates with the passage of return, to bring back the separating organ in the return line.

When the device 28 forms the introductory station, then it is the passage 32 which is connected to the return line, and the separating member 42 conveyed in this line being pushed by the transport fluid comes naturally to stay in room 38. This room containing the separator remain naturally removed from the transmission line as long as it is not necessary to change the product flowing in this line. When one wish to change this product, we place the separating member 36 so as to arrange the chamber 38 containing the separating member 42 in place of the chamber 40 of Figure 3, the tip 32B being connected to the input E of the line transport. By actuating the valves VA and VB, we change the power supply to which is connected this input and feeding the transmission line with the new chosen feed, we push the separator organ to the post evacuation 22.

In the example shown, the two chambers 38 and 40 of the body charger 36 are similar and are alternatively able to be interposed in the product passage 32 and be discarded in the first and second positions of the loader member. Specifically, rooms 38 and 40 are arranged so that in a first position of the organ charger, the chamber 38 is in the passage 32 and the chamber 40 in the passage 34, while in a second position of this loader member, the room 38 takes the place of room 40 in the passage 34 and the room 40 takes the place of the chamber 38 in the passage 32.

In this case, the charging member is formed by a movable barrel rotation about an axis A which is parallel to the axis of passage of the product. This barrel has two chambers diametrically opposed, and it is turned half a turn between its two positions, passages 32 and 34 being themselves diametrically opposed. Axis A is parallel to the direction of movement T and R.

To enable its rotational drive, the loader member 36 is secured to a drive shaft 42 aligned on its axis, this shaft carrying by example a drive head 44 (fixed by fixing screws 46) which has a hollow adapted to receive a control square 36 'integral with the loader member for driving the latter in rotation. The tree 42 itself rotated by any appropriate means, such as an electric motor M. The output of this motor can be connected to the shaft 42 by a universal joint or analog 48, allowing misalignment of the motor output relative to the axis A, to allow a rectilinear configuration of the lines LT and LR connected to the ends 30A and 32A.

A position detector 50 cooperating with the motor makes it possible to know at all times the position of the loader member 36.

The separating member 42 is in the form of a coil or a generally cylindrical shuttle, possibly with ends 42A and 42B or other areas forming beads with respect to body of this organ. The largest section of the member 42 is adapted to the inner section of the LT and LR lines which is identical. In particular, ends in the form of beads 42A and 42B have a very circular section slightly less than that of these lines, to allow the guidance of the separating member in its transport in said pipes.

To promote isolation between the two products located downstream and upstream of the separating member during the transport of the latter, the latter comprises advantageously at least one seal. In this case, it involves two joints, respectively 43A and 43B, respectively located in the vicinity of both ends. When transporting the separator in a these joints deform by folding axially towards the rear by relation to the meaning of transport. Transport directions T and R in pipes LT and LR being reversed, it is desirable that these joints can "unfold" when the charging member 42 passes from the product passage to the passage of back and vice versa. For this, at least one of these two passages advantageously has an annular groove of diameter greater than that of a joint. In this case, chambers 38 and 40 each have a groove, respectively 38'A and 40'A, respectively located in the vicinity of their ends 38A, 40A.

The device 28 advantageously comprises means for washing the charging member 36.

Thus, in the example shown, it comprises means for moving the charging member 36 between a working position and a washing position, respectively shown in Figures 3 and 4. In the working position, the chamber 38 of the loader member is capable, in the first position of this last, to be connected in a substantially watertight manner to the line of transport LT being interposed in the product transport passage 32. In the washing position, a space allowing the circulation of a fluid of washing in room 38 and around it is provided inside of the device 28.

The means for moving the charging member 36 between its positions of work and wash include a push member 44 which is arranged in the body 29 of the device 28 in which the organ is also disposed charger 36, the member 44 having a thrust face 44A adapted to cooperate with the opposite face 36A of the loader member. The faces 36A and 44A are oriented transversely to the axis A. The pushing member 44 has the shape of a wafer with two diametrically opposed holes, respectively 48 and 50, are permanently aligned with the product passages 32 and return 34. These holes are therefore alternately aligned with the chambers 38 and 40.

To solicit the loader member 36 in the working position, the body of thrust 44 is biased in the direction of arrow F of FIG. that the face 44A exerts a thrust action against the face 36A of the organ loader, which it pushes back to the axially locked position, in which this loader member cooperates with a fixed stop 52. These are for example the 38A and 40A ends of the chambers 38 and 40 opposed to the thrust member 44 which then rest against this fixed stop forming a shoulder to inside the body 29.

When it is desired to wash the charging member 36, the stop 44 in the direction of arrow G of Figure 4, opposite that of the arrow F. The face 44A then moves away from the face 36A of the charging member 36 and, under the effect of the gravity or pressure of the washing fluid used (the directions of circulation T and R can be horizontal or vertical), this organ 36 moves in the body 29 to move away from the stop 52.

We see in Figures 4 and 5 that in this situation, a J game exists around the charging member inside the body 29, allowing the circulation of the washing fluid.

As can be understood by comparing FIGS. 4 and 5, the organ charger 36 has a diametrical through passage 54, disposed between the chambers 38 and 40 and perpendicular to the diameter on which these two rooms are arranged. When rooms 38 and 40 are aligned with, respectively, the passages 32 and 34, the passage 54 of the member 36 communicates with connection tips 56A and 56B for a washing line. The thrust member 44 is in sealing contact with the inner wall of the body 29, and is closed by a wall element 44B of the side of the passage 54 so that the fluid used for washing circulates in a closed enclosure. Of course, this fluid can communicate with the passages of product 32 and back 34, and even with the transport lines and back LT and LR. To wash the entire system, it can be purged and circulate a washing fluid in the LT and LR lines, and also in the tips 56A and 56B connected to the washing line.

To move the thrust member 44, for example a shaft is used. eccentric 58 with the surface of which cooperates the first ends 60A one or more pistons 60. The second ends 60B of these pistons cooperate with the pushing member 44, possibly via springs 62. The eccentric shaft 58 is disposed substantially perpendicular to the axis A and it is rotated by means such that a motor M '. A position detector 64 makes it possible, from the outside, to check that the member 44 is in the thrust position, in which it solicits the organ charger 36 in its working position, or in a released position, in which it allows said member 36 to occupy its washing position.

As stated earlier, this possibility of washing the organ charger 36, which is important from the point of view of hygiene, in particular when the product circulating in the pipes is a food product, possible only when these pipes are empty.

After using it to separate two products circulating in the LT transport pipe, it is desirable to be able to wash the organ separator 42 without having to purge the system. The position of washing 26 which is used for this purpose. This washing station 26 is arranged on the LR return line and it has two tips, respectively 70A and 70B, connected to this pipe. The washing station includes a bedroom 72 which, in this situation, forms a portion of the line of back LR. In this chamber, the fluid flows in the direction R indicated on the figure 6.

The washing station includes means to temporarily retain the separating member 42 in this washing chamber 72. In the example shown, these means comprise at least one membrane 74, which is able to be elastically deformed to project or not to protrude into the In this case, two diametrically opposite membranes 74 are secured to a body portion 27 of the wash station so as to form two parts of the wall of the washing chamber 72. On their opposite sides to the washing chamber, these membranes each delimit a chamber of command 76 which can be supplied with control fluid for the deform so that they come down locally the section of the chamber of washing. The deformed position of the membranes is shown in dashed line in FIG. 6. Means for limiting the movement of the rods can be provided. This is for example two arches 81 in a semicircle, which are attached to the stems and whose ends touch each other to define the maximum approximation of the latter. The connecting tips 78 to these chambers 76 are provided on the body 27. The fluid used is for example compressed air. The membranes are for example made of rubber or the like to have a natural elasticity allowing them to resume their original conformation in which they are aligned with the wall of the chamber when the pressure in the chambers 76 decreases.

In the advantageous example shown, the means for retaining momentarily the separating member in the chamber 72 comprise, in in addition, at least one resiliently flexible retaining rod arranged according to the length of the washing chamber and able to be solicited by the membranes 74 to retain the separating member in this chamber.

In this case, two axial rods, that is to say parallel to the R direction of fluid circulation in the washing chamber are provided. These rods 80 each have a first end 80A, which is located upstream in the R direction and which is fixed, and a second end 80B which is free. The membranes 74 cooperate with these rods on the side of their ends free 80, for example via wafers or link dips 82. We understand that when the air pressure increases in the rooms 76, the membranes push the rods 80 so that the diameter delimited between them two decreases. Thus, this diameter decreases gradually in the direction R, and the separating member is gradually braked and stopped in the washing chamber 72.

In the example shown, two other rods 84, similar to the rods 80 but arranged at both ends of a diameter perpendicular to diameter at the two ends of which are arranged the rods 80, are also planned. These rods 84 are not stressed by the membranes 74, but they constitute guides for positioning the separating member 42 in the washing chamber 72.

It is understood that fluid free circulation spaces are arranged around the separating member 42, with the exception of contact of this organ with the rods 80 and 82. Thus, under the effect of the circulation of the washing fluid in the chamber 72, this separating member is perfectly washed.

When we consider that the washing has lasted long enough, it suffices to releasing the pressure in the chambers 76 and the separating member 42 may, under the effect of the fluid flowing in the return line LR, continue its progression until reaching the introductory position 20.

Thus, the invention avoids product mixing in the line of LT during a change of supply of this line, by the 16A or 16B power supplies. Optionally, a product mixture can only occur between the VA or VB winches and the introductory position, at the entry level. This affects a very small volume of product, and this area very small mixture will be transported with the product, to the post discharge. At this point, the small volume of mixture can be evacuated, before the pure product downstream of this small mixing zone is injected into the mixer 14. Of course, it is desirable to connect the valves VA and VB closer to the entrance 38B or 40B of the chamber 38 or 40 of the loader, to minimize the quantities of products mixed.

Claims (15)

1. System for injection of at least two products into containers (12), comprising a product conveyance line (LT) having an input (E) able to be selectively connected to a first or to a second product supply (16A, 16B) and an output (S) through which the conveyed product can be injected into containers (12), and a station (20) for introduction of a separator organ, arranged in the vicinity of the input (E) of the conveyance line (LT) and able to introduce into the said line a separator organ (42) capable of isolating two products conveyed in the line from each other on either side of the said organ when this organ is itself conveyed in the line, characterised by the fact that it includes a station (22) for evacuation of the separator organ, arranged in the vicinity of the output (S) of the conveyance line and able to evacuate the separator organ from the said line.
2. System as described in claim 1, characterised by the fact that it also includes a return line (LR) able to return to the introduction station (20) the separator organ (42) evacuated from the conveyance line (LT) by the evacuation station (22).
3. System as described in claim 1 or 2, characterised by the fact that it includes a washing station (26) able to wash the separator organ (42) before its introduction into the conveyance line (LT) by the introduction station (20).
4. System as described in claims 2 and 3, characterised by the fact that the washing station (26) is arranged in the return line (LR).
5. System as described in any one of claims 1 to 4, characterised by the fact that it includes a device (28) for separator organ loading or unloading, which has a product passage (32) forming a section of the conveyance line (LT) and a loading organ (36) including at least one chamber (38, 40) able to contain a separator organ (42) between its two open ends (38A, 38B; 40A, 40B), the said loading organ being moveable between a first position in which the said chamber (38) is interposed in the said product passage (32) so that the separator organ (42) contained in this chamber can be carried along by the flow of product in the conveyance line (LT) and a second position in which the said chamber is distant from the said product passage.
6. System as described in claim 5, characterised by the fact that the loading organ (36) includes means (35) for retaining the separator organ (42) in the chamber (38, 40), the said means allowing entry of the said separator organ into the chamber and egress of this organ from this chamber only through one of the ends (38A, 40A) of the said chamber.
7. System as described in claim 2 and any one of claims 5 and 6, characterised by the fact that the device (28) for separator organ loading or unloading has a return passage (34) arranged in the return line (LR) and by the fact that, in the second position of the loading organ (36), the said chamber (38) is arranged in the return passage (34).
8. System as described in any one of claims 5 to 7, characterised by the fact that the loading organ (36) includes two similar chambers (38, 40), able in turn to be interposed in the product passage (32) and to be removed from it in the first and second positions of the loading organ.
9. System as described in claim 8, characterised by the fact that the loading organ (36) is formed of a cylinder moveable in rotation about an axis (A) parallel with the axis of the product passage (32).
10. System as described in any one of claims 5 to 9, characterised by the fact that the device (28) for separator organ loading or unloading includes means (56A, 56B) for washing the loading organ (36).
11. System as described in claim 10, characterised by the fact that the device (28) for separator organ loading or unloading includes means (44) for displacing the loading organ (36) between a working position (Figure 3) and a washing position (Figure 4), the said at least one chamber (38) of the said organ being able, in the working position and in the first position of the loading organ, to be tightly connected to the conveyance line (LT) by being interposed in the product passage (32), while, in the washing position, a space (J) permitting circulation of a washing fluid in the said chamber (38) and around the latter is formed inside the device (28) for separator organ loading or unloading.
12. System as described in any one of claims 5 to 11, characterised by the fact that the introduction station (20) and the evacuation station (22) each comprise a similar device for separator organ loading or unloading.
13. System as described in claim 4 and any one of claims 1 to 12, characterised by the fact that the washing station (26) includes a washing chamber (72) having a section greater than the section of the return conduit (LR) and means (74, 76, 80) for momentarily retaining the separator organ (42) in the said washing chamber.
14. System as described in claim 13, characterised by the fact that the means for momentarily retaining the separator organ (42) in the washing chamber include at least one diaphragm (74), which is fixed to the wall of the said chamber (72) and which is able to be elastically deformed to project into this chamber or otherwise.
15. System as described in claim 14, characterised by the fact that the means for momentarily retaining the separator organ (42) in the washing chamber also include at least one elastically flexible retaining rod (80), arranged along the length of the washing chamber (72) and able to be biased by the said diaphragm (74) to retain the separator organ in this chamber.

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