FR3075768A1 - MOVING PRODUCTS ON A TRANSIT ZONE - Google Patents

Abstract

The invention relates to a device (2) for moving products (1), comprising a circulation module in a longitudinal direction of the products (1) with a transit zone (3) extending along a transfer direction. transverse, an inlet (6) and a longitudinal outlet (7), conveying means (8) provided with shuttles (9) with thrust members (10), characterized in that said conveying means (8) ensure independently moving each shuttle (9) and comprising a lower feed guide (12) from the inlet (6) to the outlet (7); an upper return guide (13) for inverse drive; a pair of vertical upstream (14) and downstream (15) vertical guides between said forward guide (12) and said return guide (13). The invention also relates to an installation with such a displacement device (2) and a method of moving products (1) using said device (2).

Description

Movement of products in a transit area

The present invention is in the field of moving products within a production and / or packaging line.

For the purposes of the present invention, the term “product” includes an individual object or a group of objects held together.

Such objects consist of containers, such as flasks, bottles, cans, etc. These products undergo a first so-called production phase during which they are finalized individually through a succession of several stages within corresponding modules, such as filling, capping and labeling.

Then, said ready-to-use products undergo subsequent stages by crossing different modules, such as for example a module for packaging in batches, each batch being constituted by grouping, in staggered rows or not, of several products. During these stages, said products pass through at least one circulation module where they are moved along different transit zones, in particular on mobile zones constituted by conveyors, or else are accompanied on fixed or mobile zones through actuators coming to retain or push said products, or else the products are pushed at the time of the transfer from one zone to another, in particular by crossing an intermediate zone called "dead zone". The invention particularly relates to the movement of products along such a transit zone of a circulation module.

In known manner, a circulation module is provided with at least one transit zone extending from an upstream end to a downstream end. Such a module ensures the movement of the products over said transit zone, along a transfer direction, from an inlet located along the upstream end to an outlet located along the downstream end. The inlet and outlet generally extend in a longitudinal direction and are parallel to each other. The entrance can be provided with at least one conveyor conveying, from a module located upstream, a single-wire product flow formed by a succession of rows of aligned products, each row having a length substantially equivalent to the dimension of the zone transit located opposite and on which each row will be transferred transversely, then moved in said direction of transfer. Said outlet may also include a conveyor to which one or more rows of products will be transferred, respectively forming a single line or a set of rows, which will then be moved again longitudinally to another module located downstream.

Several solutions make it possible to move the products from the entry to the exit and along said transit zone. The invention relates specifically to the displacement of products by pushing, namely by applying a contacting of a pusher at the front or rear wall of one or more products, relative to the direction of movement to be applied to them according to said transfer direction, from the upstream end to the downstream end.

In addition, the lifters are conveyed above the transit area, moving in a plane extending parallel and along said transit area, from upstream to downstream relative to the direction of traffic to be instilled. to products.

In the context of the present invention, the thrust is effected by the top of the products from the rear, from upstream to downstream in the direction of transfer.

One problem with current displacement devices lies in their flexibility of operation. Indeed, they generally ensure the transfer of products, from the entry conveyor to the transit zone, then the displacement at constant speed along this transit zone in the form of a conveyor, until their transfer to the level of the exit.

The products are only maintained at the time of their transfers from the entry and towards the exit, causing a risk of falling during their movement on the transit zone.

In addition, the pushers are spaced at regular intervals, mechanically secured to conveyor means. The dimensions of the intervals are dependent on the format of the products to be moved and, therefore, it is necessary to physically intervene on the conveyor means in the event of a format change, a tedious operation requiring production to be stopped and causing loss of tenqps.

The aim of the present invention is to overcome the drawbacks of the state of the art by proposing a displacement of the products offering a flexible and simplified operation, ensuring accompaniment of the products throughout their displacement along the transit zone. .

In addition, preferably, the invention provides for the use of dynamic conveying of the pushers. Their speed can therefore be independent, making it possible to directly modify the intervals between them, without intervening mechanically. It is then possible to roll back a pusher which has just transferred and push a first row, to enclose another next row and accompany it in its movement.

To do this, the invention firstly relates to such a product movement device, comprising a product circulation module provided with at least one transit zone extending from an upstream end to an end downstream along a direction of transfer, at least one inlet extending along a longitudinal direction and at least one outlet for said products situated respectively along the upstream end and the downstream end of said zone of transit, said transfer direction extending transversely to said longitudinal direction, said device comprising conveying means provided with shuttles driven in displacement above said circulation module and thrust members along the transfer direction d 'at least one product, at least one pushing member being attached below a shuttle.

Such a device is characterized in that said conveying means ensure the independent displacement of each shuttle and include at least one lower drive guide from the inlet to the outlet; at least one upper return guide for each shuttle from the exit to the entry; at least one pair of upstream and downstream vertical elevator guides between said outward guide and said return guide.

According to other characteristics, said conveying means can constitute a linear motor.

Each pushing member can extend vertically and orthogonally with respect to the transfer direction.

The same shuttle can support a single thrust member.

Said conveying means may include several outward guides, as many return guides and as many pairs of upstream and downstream elevator guides, respectively mutually parallel, and by the fact that at least one same thrust member is supported during its movements by several shuttles with reciprocally synchronized movements along said forward guides, along said return guides and along each of said pairs of upstream and downstream elevator guides.

Said transit zone can constitute a lotage table and / or an accumulation table for said products.

Said device can be split symmetrically on either side of a median plane centered at said inlet or said outlet, forming corresponding right and left “elements”, said displacement device preferably comprising the same downstream elevator guide or upstream transfer between the right and left elements. The invention also relates to a product processing installation, equipped with such a displacement device.

Said processing installation comprises a shrink wrapping or casing station for one or more of said products.

It is characterized in that it comprises at least one device for moving said products according to the invention, supplying products with said station through said outlet.

Such an installation may include at least one grouping station for several products in longitudinal groups of a single wide product, said grouping station being located upstream and supplying said movement device through said entry with a single line of said longitudinal groups spaced from each other. The invention also relates to a method of moving products from an inlet to an outlet by means of the displacement device according to the invention. Such a method is characterized in that it comprises at least the following steps: supplying the inlet with a longitudinal row of products; stop the circulation of products at the entrance; pushing said longitudinal row of products from the inlet to the outlet, along a transfer direction, using a pushing member; and evacuate the products through said outlet.

Said method can consist in bringing together or away from the transit zone at least two successively pushed rows, by conveying the pushing members of each of said two rows at different speeds. During the pushing step, at least during the transfer to or from said transit zone, each row of products can be clamped on either side between two upstream and downstream pushing members. After the transfer of a first row to or from the transit zone, the pushing member having carried out said transfer can be moved back, to a second row to be transferred to or from said transit zone, until it comes to grip said second row with a second upstream thrust member. Said row can be formed of several longitudinal groups of a single wide product spaced from each other.

Said method can consist in forming matrix batches of said products leaving said transit zone. The use of a shuttle drive supporting the thrust organs of the products in the form of a linear motor, makes it possible to modify the intervals between the two organs, but also to modify their speed of movement, without mechanical intervention at the level of said device. displacement. Using a linear motor therefore confers dynamic and adaptable displacement of the pushers, even allowing them to be moved in the opposite direction.

The variable speeds allow in particular rapid recycling of the thrust members, from the downstream to the upstream, when they are empty, not exerting thrust. The invention will find a preferential, but in no way limiting, application, replacing a grouping station for products entering a wrapping or case packing station, instead of a selection station and possibly a cycler. . Other characteristics and advantages of the invention will emerge from the detailed description which follows of nonlimiting embodiments of the invention, with reference to the appended figures in which: FIG. 1 schematically represents a perspective view of an example production of a double displacement device, with two inlets and centered at a single outlet, showing only on a left portion a specific arrangement of the thrust members; - Figure 2 schematically shows a view in a vertical cross section of a simple device and an example of conveying several thrust members; FIG. 3 schematically represents an elevation view of an example of a simple device, with a continuous supply of products; and - Figure 4 schematically shows an elevational view of an example of a double device, with a supply of products separated into groups.

The present invention relates to the movement of products 1 within a production and / or packaging line. To this end, the invention relates to a device 2 for moving products 1.

Such a device 2 comprises a product circulation module 1 provided with at least one transit zone 3. It extends from an upstream end 4 to a downstream end 5, along a transfer direction. Said device 2 can comprise other modules, located upstream and / or downstream, or else at different levels of said transit zone 3.

Preferably, said transit zone 3 can constitute a lotage table and / or an accumulation table for said products 1. An example configuration according to which said transit zone 3 consists of an accumulation surface for said products 1 is shown on the FIG. 3, with an accumulation of products 1 along rows, a single row arriving and two rows leaving respectively towards and from said displacement device 2.

Said transit zone 3 can be fixed or preferably mobile, in the form of a conveyor ensuring the movement of the products 1 resting there.

In addition, said displacement device 2 comprises at least one inlet 6 of said products 1 extending along a longitudinal direction. Said inlet 6 is situated along said upstream end 4. The device 2 also comprises at least one outlet 7 of said products 1, situated along the downstream end 5.

The transit zone 3, the inlet 6 and the outlet 7 are abutted, their respective edges being flush. Their upper surfaces generally extend in the same plane, preferably a horizontal plane.

Preferably, the inlet 6 is equipped with at least one conveyor, transporting at least one row of products 1, in said longitudinal direction. Said outlet can also be equipped with a conveyor, conveying the products 1 in a parallel direction. The outlet 7 is therefore preferably found parallel to the inlet 6. Otherwise, the outlet 7 can be oriented at an angle, at an angle with respect to said longitudinal direction. The inlet 6 and outlet 7 conveyors can transport the products 1 which they support in the same direction or in different directions (i.e. with reference to FIGS. 3 and 4, to the right or to the left).

In inlet 6 as in outlet 7, the conveyors extend over at least the entire length of the transit area 3. In other words, they are at least as long as the transit area 3, the opposite edges of which they run along respectively.

Preferably, said transfer direction extends transversely relative to said longitudinal direction. In particular, it can be orthogonal, or even substantially orthogonal, according to a variation of angle ranging up to plus or minus 45 °.

The products 1 therefore arrive transported by the conveyor of the inlet 6, to position themselves opposite the transit zone 3, along the upstream end 4, in the form of at least one longitudinal row.

It will be noted that a longitudinal row may consist of an uninterrupted succession of products 1, in a row, as visible in FIG. 3, or else of a succession of several products 1 grouped, for example by two in 1 ' example of FIG. 4. A row therefore corresponds approximately to the dimension of the transit zone 3 along which the inlet 6 and outlet 7 extend.

Then, this row is moved from the entry conveyor 6 to the transit zone 3. In order to authorize this first movement, the circulation of the products 1 is stopped at the entry 6. In particular, we slow down or we stops the inlet conveyor 6 when a full row of products 1 has arrived along the upstream end 4.

Said longitudinal row of products 1 is pushed from the inlet 6 to the outlet 7, along said transfer direction.

Similarly, the outlet conveyor 7 is slowed down or stopped when transferring one or more rows of products 1 to it.

Finally, the products 1 are removed via said outlet 7, in particular by starting the outlet conveyor 7.

To carry out this movement of movement of the products 1, the device 2 according to the invention comprises conveying means 8 provided with shuttles 9 driven in movement above said circulation module. In sum, the conveying means 8 ensure the drive of each shuttle 9 above the transit zone 3, but also above the inlet 6 and the outlet 7, or even preferentially beyond said inlet 6.

In addition, the conveying means 8 are provided with thrust members 10 of at least one product 1, preferably of a row of products 1, along the transfer direction. Consequently, a thrust member 10 is dimensioned so as to extend from its shuttle 9 until it comes against the front wall of the products 1, this contact ensuring the thrust making it possible to move at least one product, preferably several products 1 simultaneously. To this end, a pushing member may have a length at least equal to the row of products 1 transported on the transit zone 3. In addition, the height of a pushing member 10 is such that it preferably bears against each product 1 below its center of gravity, limiting the risk of tilting when the thrust is applied.

In a nonlimiting manner, as visible in FIG. 2, each thrust member 10 extends vertically and orthogonally with respect to the direction of transfer. To this end, a pushing member 10 can be constituted by a sheet 11, as visible in FIG. 1. Other configurations can be envisaged, such as a bar suspended from rods fixed to each shuttle 9, or even pushers.

In particular, a sheet 11 can be subjected to a shuttle 9 at its upper part, in particular its upper edge, leaving its lower edge free, with a view to bringing the surface located on the downstream side into contact. This configuration also allows the opposite surface, located on the upstream side, to be left free.

In general, the pushing members 10 are fixed below the shuttles 9.

At least one pushing member 10 is fixed below a shuttle 9. Thus secured, the movement of the shuttle 9 induces the movement of the member 10 that it supports.

Advantageously, said conveying means 8 ensure the independent displacement of each shuttle 9. To do this, they comprise at least one lower guide 12 for driving each shuttle 9 from the inlet 6 to the outlet 7, at least an upper return guide 13 for driving each shuttle 9 from the outlet 7 towards the inlet 6. In addition, the conveying means 8 comprise at least one pair of upstream vertical upstream guides 14 and downstream 15 between said outgoing guide 12 and said return guide 13.

It will be noted that the outward guide 12 and the return guide 13 may be located in the same vertical plane or in a plane inclined with respect to the surface of the transit zone 3. In addition, they are provided fixed.

Each upstream and downstream elevator guide 14 and 15 is therefore provided movable vertically or substantially vertically, passing from a low position to a high position, and vice versa. The upstream and downstream 15 elevator guides are motorized according to independent movements, one going up when the other goes down, or vice versa, or even going up or down simultaneously but at different speeds. Each upstream and downstream elevator guide 14 and 15 is therefore mobile according to an at least vertical component. In addition, in the lower position each upstream elevator guide 14 and downstream 15 is found abutted at one end with the forward guide 12, while in the high position, they are joined and aligned with the return guide 13.

In addition, the outward guides 12, return 13 and upstream elevators 14 and downstream 15 can be constituted at least in part by rails ensuring the maintenance of each shuttle 9, in particular according to at least one vertical and / or horizontal component, while allowing their translational movement in at least the transfer direction, namely along such rails.

The shuttles 9 therefore travel in a loop, ensuring the thrust of the products 1 along a forward path and returning empty along a return path. In particular, on the outward path, the upstream elevator 14 can be lowered directly above the entry conveyor, but is preferably lowered beyond the surface of the entry conveyor 6, for example on the left within 'a free space as visible in Figure 2. A shuttle 9 translates, passing on the forward guide 12, projecting above the input conveyor 6, then moving a pushing member 10 to come into contact with the row of products 1 to be transferred to the transit zone 3. This shuttle 9 continues to push products 1 by following the forward guide 12 until passing over the downstream elevator guide 15 in the low position. It is only at this moment that the downstream elevator guide 15 is raised to its high position, lifting the shuttle 9. Once aligned with the return guide 13, said shuttle 9 can circulate following said return guide 13 until 'to pass on the upstream elevator guide 14, which has been raised in the meantime in the high position. Once supported by the return guide 14, the latter is lowered to the low position and said shuttle 9 can then start a loop again.

It will be noted that, unlike the inlet 6, the downstream elevator guide 15 is also located above the conveyor of the outlet 7. In fact, the pushing members 10 can be oriented in the direction of evacuation at the outlet 7, not interfering with the movement of products 1 mus by this conveyor. Consequently, the thrust members 10, at the outlet 7 can also constitute means for channeling the products when they are extracted from the displacement device 2.

According to a preferred embodiment, shown in FIG. 3, said conveying means 8 reinforce several outward guides 120,121, as many return guides 130,131 and as many pairs of upstream elevator guides 140,141 and downstream 150,151, respectively parallel to each other. More specifically, a path located on the left consists of a forward guide 120, a return guide 130 and a pair of upstream 140 and downstream 150 elevator guides, while on the right side, extend in parallel, a forward guide 121, a return guide 131, as well as a set of upstream 141 and downstream 151. elevator guides. Consequently, at least one and the same pushing member 10 can be supported during its movements by several shuttles 9 with movements synchronized reciprocally along said guides going 120,121, along said return guides 130,131 and along each of said pairs of upstream elevator guides 140,141 and downstream 150,151. In summary, each thrust member 10 is supported by two shuttles 9 driven simultaneously along identical paths, along vertical (or substantially vertical) planes parallel to each other. A greater number of parallel guides can be envisaged as a function of the length of the rows of products 1 to be moved, of the size of the inlet and outlet conveyors 6 and also of the surface of the transit area 3.

Preferably, the same shuttle 9 supports a single pushing member 10, as visible in FIG. 2. According to another embodiment, a shuttle 9 can support several pushing members 10, spaced upstream or downstream, according to fixed intervals authorizing each member 10 to be positioned on either side of at least one row of products 1.

Similarly, with parallel paths, several thrust members 10 can be supported on each side, left and right, by several shuttles 9 synchronized along their respective paths.

With reference to FIG. 3, the displacement device 2 is provided simple, namely that it comprises conveying means 8 above a single transit zone 3.

According to the embodiment shown in FIG. 4, the conditioning device 2 is symmetrically split on either side of a median plane, in principle vertical, centered at the level of said outlet 7, forming straight "elements" and corresponding lefts. The device therefore comprises a first 30 and a second 31 transit zones, on either side of the outlet 7. Likewise, the products 1 supply each right and left part of the device 2 via a first inlet 60 and a second entry 61.

It will be noted that the device 2 can also be symmetrically split centrally on the same input 6, then comprising several outputs 7.

In this split configuration, around the exit 7 as well as around the entrance 6, each right and left shuttle path 9 can include its own upstream 140,141 and downstream 150,151 elevator guides respectively. According to the preferred configuration for duplication, the device 2 comprises a same downstream elevator guide 14 or upstream 15 for transfer between the right and left elements. As shown in the example in FIG. 4, with a split centered on the outlet 7, the conveying means 8 situated to the right and to the left share two downstream elevator guides 150, 151 situated parallel above the outlet conveyor 7.

Advantageously, the movement of the shuttles 9 along their respective guides is carried out independently. It is then possible to accelerate or decelerate the speeds of each shuttle 9 and thus to apply an increasing or decreasing thrust to the products 1, but also to bring closer or apart the rows of products 1 during their movements.

To do this, preferably, said conveying means 8 constitute a linear motor. In particular, each guide constitutes part of a track of a linear motor, authorizing a shuttle 9 to move at a different speed from another shuttle 9 along this track. In short, each shuttle 9 can have its own speed, which can be easily and easily configured via an adapted interface, in particular remote from said displacement device 2. Each shuttle 9 then becomes autonomous in its movements.

In particular, it is possible to considerably accelerate the speed of movement of the shuttles 9 during their return journey, empty, along the return guide 13, from their departure along the downstream elevator guide 15, decelerating to 1 ' stop at the time of arrival at and along the upstream elevator guide 14. Consequently, the invention can consist in bringing together or away from the transit zone 3 at least two rows pushed successively, by conveying the pushing members 10 of each of said two rows at different speeds. Preferably, the speed of the first row, moved downstream, is less than the speed of the next second row, moved after and upstream, so that it catches up with said first row as and when they respectively move along said transit zone 3, to arrive jointly for their transfer to exit 7.

In addition, the invention provides for being able to reverse a shuttle 9 and therefore the thrust member 10 that it supports. Thus, during the pushing step, at least during the transfer to or from said transit zone 3, each row of products 1 can be clamped on either side between two upstream and downstream pushing members 10 (unlike a simple push using a single push member 10 necessarily located upstream). Such a tightening limits the risks of the products 1 falling during their transfer, in particular when passing dead zones between the different surfaces, such as between the transit zone 3 and the inlet 6 and outlet conveyors 7.

Further on, after the transfer of a first row to or from the transit zone 3, the first thrust member having carried out said transfer is moved back, to a second row to be transferred to said transit zone 3, until it comes in clamping said second row with a second upstream thrust member. We can then move the second row to catch up with the first row, the first member then resuming its pushing function of said first row.

It is also possible to separate two successive rows, according to an adaptable spacing. In short, two successive rows can then be found anywhere in the transit zone and / or at exit 7 spaced transversely. This space can be predefined according to specific dimensions. The invention also provides, upstream, to group said products 1 transversely and then to transfer said longitudinal groups of products 1, aligned in a row, at said entry 6 towards said transit zone 3. An example of such a possibility is shown. in FIG. 4, showing a flow of product groups 1 supplying the input 6 two by two on a single line. The invention also provides for forming matrix batches of said products 1 at outlet 7 from said transit zone 3, as visible in the example of FIG. 4, with batches formed by the gathering of four rows of products grouped in pairs. before each entry 6, two rows being moved from the bottom of the split device 1, while two other rows come from the top. As such, for the sake of readability, Figure 4 shows only the products 1 and the thrust members 10 located on one of the two devices 2 split. The invention also relates to a product processing installation 1, comprising a shrink wrapping or casing station for one or more of said products 1, said installation comprising at least one movement device 2 for said products 1, supplying products 1 said bundling or packing station through said outlet 7. In particular, the displacement device 2 according to the invention makes it possible to supply a bundling module with products 1 collected, in the form of successive batches at outlet 7, freeing itself from a classic selection position.

Upstream, such a treatment installation may comprise at least one station for grouping together several products 1 according to longitudinal groups of a single product 1 wide, then forming a line of groups of products 1 spaced apart, which will be brought together at outlet 7 to form batches. Such a grouping station is located upstream and therefore supplies said displacement device 2 through said inlet 6 with a single line of said longitudinal groups spaced from one another.

It will be noted that if the outlet 7 is intended to receive several rows, logically, the width of its conveyor is dimensioned accordingly with respect to the maximum number of products 1 to be received and their format.

In certain embodiments of the invention, the input 6 can be supplied with at least two longitudinal rows side by side which can then be pushed simultaneously from said input 6 to the transit zone 3. Preferably, the input 6 receives a single row of products. In this case, the successive rows are brought one after the other into the transit area 3. With regard to the outlet 7, depending on its size, it is possible to transfer one or more rows of products from the area of transit 3 to exit 7.

Thus, the invention may consist in supplying said inlet 6 longitudinally with a first row then a second row and pushing them progressively along the transit zone 3 until they are transferred to the outlet 7, successively or together. To this end, the invention also relates to a process for moving products 1 on a circulation module from an inlet 6 to an outlet 7 by means of the displacement device 2 as previously described. Such a displacement method comprises at least the following steps, consisting in supplying the inlet 6 with a longitudinal row of products 1; to stop the circulation of products 1 at entry 6; pushing said longitudinal row of products 1 from the inlet 6 to the outlet 7, along a transfer direction, using a pushing member 10; and to evacuate the products 1 through said outlet 7.

Thus, the movement of products 1 according to the invention offers flexible management during the transfer of said products 1 along a transit zone 3, providing support by pushing, but also possible maintenance during their movements. The movement is ensured through shuttles with a specific route, limiting the space within the production line, but also allowing to independently manage the movements of each shuttle, downstream in the direction of circulation of said products, but also backwards while reversing.

This management of the variable speed of the shuttles 9 offers the possibility for the invention to adapt to the incoming product flow 1. In addition, in case of discontinuity in the supply of products 1, regardless of whether products 1 arrive or not, it is possible to stop the shuttles 9 at the level of the upstream elevator guide, as well as to store them at the level of the guide return 13, the time that a row of products 1 is conveyed along the input conveyor 6. For example, sensors can detect the presence of products 1 and, thus, activate the movements of the shuttles 9 to effect the thrust of said products 1 at the right time.

In addition, it is possible to adapt the pushing force as a function of the type of products 1 to be moved, in particular if they are fragile, such as glass containers, or light. The pushing force will then be managed differently, in particular allowing the pushing members 10 to be brought into contact at a lower speed in order to avoid shocks for fragile or unstable products 1. It is also possible to manage the degree of acceleration as a function of the type of products 1, in particular at the levels of inputs 6 and output 7, without impacting the other thrusts of other rows of products 1, for example along the zone of transit 3.

Claims (15)

1. Product movement device (2) (1), comprising a product circulation module (1) provided with a monk a transit zone (3) extending from an upstream end (4) to a downstream end (5) along a transfer direction, at least one inlet (6) extending along a longitudinal direction and at least one outlet (7) of said products (1) located respectively along the the upstream end (4) and the downstream end (5) of said transit zone (3), said transfer direction extending transversely to said longitudinal direction, said device (2) comprising conveying means ( 8) provided with shuttles (9) driven in displacement above said circulation module and the thrust members (10) along the direction of transfer j of at least one product (1), at least one thrust member ( 10) being fixed below a shuttle (9), characterized in that said conveying means ge (8) ensure the independent movement of each shuttle (9) and include: - at least one outward guide (12) lower drive from the inlet (6) to the outlet (7); - at least one upper return guide (13) for driving each shuttle (9) from the outlet (7) to the inlet (6); at least one pair of upstream (14) and downstream (15) vertical elevator guides between said outward guide (12) and said return guide (13). 2. A displacement device (2) according to claim 1, characterized in that said conveying means (8) constitute a linear motor. 3. Displacement device (2) according to any one of the preceding claims, characterized in that each thrust member (10) extends vertically and orthogonally with respect to the transfer direction. 4. Displacement device (2) according to any one of the preceding claims, characterized in that the same shuttle (9) supports a single thrust member (10). 5. Movement device (2) according to any one of the preceding claims, characterized in that the said conveying means (8) comprise several outward guides (120,121), as many return guides (130,131) and as many pairs of guides upstream (140,141) and downstream 150,151 elevators, respectively parallel to each other, and by the fact that at least one same pushing member (10) is supported during its movements by several shuttles (9) with movements synchronized reciprocally along said outward guides (120,1-21), along said return guides (130,131) and along each of said pairs of upstream (140,141) and downstream (150,151) elevator guides. 6. Displacement device (2) according to any one of the preceding claims, characterized in that said transit zone (3) constitutes a batching table and / or an accumulation table of said products (1). 7. Displacement device (2) according to any one of the preceding claims, characterized in that it is symmetrically split on either side of a median plane centered at the level of said inlet (6) or said outlet (7), forming corresponding right and left “elements”, said displacement device (2) preferably comprising the same downstream (15) or upstream (14) elevator guide for transfer between the right and left elements. 8. Product processing installation, comprising a shrink wrapping or casing station for one or more of said products (1), characterized in that said installation comprises at least one movement device (2) of said products (1) according to Any one of the preceding claims, supplying products to said station through said outlet. 9. Treatment installation according to claim 8, characterized in that it comprises at least one grouping station for several products (1) according to longitudinal groups of a single wide product, said grouping station being located upstream and supplying said displacement device (2) through said inlet (6) with a single line of said longitudinal groups spaced from each other. 10. Method for moving products (1) on a product circulation module from an inlet (6) to an outlet (7) by means of the movement device (2) according to any one of claims 1 to 7, characterized in that it comprises at least the following steps: - supplying the inlet (6) with a longitudinal row of products (1); - stop the circulation of products (1) at the entrance (6); - Pushing said longitudinal row of products (1) from the inlet (6) to the outlet (7), along a transfer direction, using a pushing member (10); and - evacuate the products (1) through said outlet (7). 11. A displacement method according to claim 10, characterized in that it consists in bringing together or away from the transit zone (3) at least two rows pushed successively, by conveying the pushing members (10) of each of said two rows at different speeds. 12. A displacement method according to any one of claims 10 or 11, characterized in that during the pushing step, at least during the transfer to or from said transit zone (3), each row of products (1 ) is clamped on either side between two upstream and downstream thrust members (10). 13. A displacement method according to claim 12, characterized in that after the transfer of a first row to or from the transit zone (3), the pushing member (10) having moved said transfer is moved back, towards a second row to be transferred to or from said transit zone (3), until it comes to grip said second row with a second upstream thrust member (10). 14. A displacement method according to one que1conque of claims 10 to 13, characterized in that said row is formed of several longitudinal groups of a single product (1) wide spaced from each other. 15. A displacement method according to any one of claims 10 to 14, characterized in that it consists in forming matrix batches of said products (1) at the outlet of said transit zone (3).