• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:NL2008373A
    申请号:NL2008373
    申请日:2012-02-28
    公开日:2012-09-04
    发明作者:Eddy Alfred Herre Goot；Barend Ravenhorst；Robert Nieuwenhuis；Robert David Riet
    申请人:Food Processing Systems；
    IPC主号:
    专利说明:

    P94558NL00
    Title: Method and system for controlling the flow of a stream of products
    The present invention relates to a method for controlling the flow of a stream of substantially spherical and substantially equally large products, for example eggs, on the basis of control signals, wherein in a conveying direction a progressive stream of mutually randomly positioned and in random order products is formed, comprising: - supplying and moving said flow at a predetermined supply speed from a first supply conveyor over a substantially horizontal plane at a specific supply width to an output with a predetermined output width corresponding to substantially the size of a predetermined number of N products, with N a natural number, wherein at least over part of the downstream feeder conveyor, prior to the said output, N subflows are formed, - the at a specific throughput speed of a feedout conveyor, a applied downstream of the feed conveyor, taking over the products from the feed conveyor, - monitoring and observing said current with at least one detector, whereby detection signals are obtained, and - processing at least said signals into control signals with a processing unit.
    The invention further relates to a system for controlling the flow of a stream of substantially spherical and substantially equally large products, for example eggs, on the basis of control signals, wherein in a conveying direction a progressive stream of mutually randomly positioned and in random order products is formed, comprising, - a feed conveyor for feeding and advancing said flow over a substantially horizontal plane at a predetermined feed width, to an output with a predetermined feed width corresponding to substantially the size of a feed stream. predetermined number of N products, with N a natural number, at least over part of the downstream feed conveyor, prior to said output, N partial flows being formed, - a feed conveyor, arranged downstream of the feed conveyor, for r taking over the products from the feed conveyor at a specific throughput speed, - at least one detector for monitoring and observing said current, whereby detection signals are obtained, and - a processing unit for processing at least said signals into control signals.
    US2009020395 describes a system wherein at a set speed of a sorting conveyor the supply of the products, namely eggs, is adjusted to this conveyor. In this area of technology, a roller conveyor is usually used for this processing process of sorting eggs. As is generally known, these rollers form a row of rollers one behind the other and such a conveyor often comprises several rows next to each other. Each pair of rollers positioned one behind the other forms a transport position for an egg. In order to optimally use such a machine, the aim is to actually give each pair an egg, which is then referred to as 100% filling. An endless flat conveyor belt is usually used on the supply side of such a roller conveyor. The eggs will therefore have to be supplied very evenly, and especially evenly distributed, in order to achieve such a degree of filling. To this end, according to the invention, the following measures have been taken in US2009020395: - monitoring the egg flow with a camera above the supply - controlling the speed of the conveyor belt therewith - and in the case of too large a supply, switching on return belts to remove the excess from the power, return, and later reinsert into the main power.
    An inevitable consequence of such a control is that transport positions remain unoccupied with some regularity.
    Clearly, this method and such a system have the purpose of avoiding blockages in the event of a large supply. With this bulk supply with stop handling and varying supply quantities, the occasional occupancy of transport positions is not a major disadvantage since it has been found that the capacity utilization is generally far above 90%. More in particular, the process of sorting, namely characterizing the eggs and assigning and ejecting the eggs in the correct position, is not affected at all.
    Of a completely different nature from the aforementioned bulk supply in the sorting process is the direct supply of eggs in a collection and packaging process. Here too, large quantities of eggs are supplied, but entirely different requirements are set for the distribution and transfer of the eggs. More in particular, eggs collected in this way are traded in a way that is calculated in packaging units. In this process, all packaging positions must be occupied in such packaging units.
    In order to remedy the above-mentioned shortcoming and to meet the requirements for collecting and packaging, the method according to the present invention is characterized in that upon observing, in said at least one partial flow, an interruption extending over an intermediate distance B> 0 , 5 cm, at least the difference between the feed speed and the feed speed is changed.
    It has been found that a continuous flow of eggs can be realized with great advantage with which packing units can be filled in a very reliable manner.
    According to a further elaboration, the speed of the transit conveyor is reduced. According to a further elaboration, said control (which can be effected by said processing unit) can be set such that, even at a said interruption in the said distance of 0.5 cm, intervention is made in the setting of the speed of the first conveyor, in the especially by reducing that speed. This way the hole can get more time to fill up again.
    According to a further elaboration, the said at least one partial stream can be divided up into at least two sections, Si as the most downstream section, and S2 as a subsequent section, with corresponding intervals Bi, B2, for which Bi <B2 applies.
    According to a further elaboration, the said at least one partial stream can be divided up into more than two sections Si, with i a natural number with i> 3, with corresponding intermediate distances Bi for which at least Bi Φ Bi + 1 applies.
    According to a further elaboration, a supply flow of products with a preset supply speed can be supplied by a second supply conveyor to the first supply conveyor, over a substantially horizontal plane. The feed stream can have a feed width Ws with Ws> Wi. Preferably said supply current is monitored and observed with at least a second detector, whereby second detection signals are obtained which are processed by the processing unit into second control signals. According to a further elaboration, a strip on the downstream side of the second feed conveyor with feed width Ws and feed length Ls of at least 0.01 m is followed and observed. In the case of a degree of filling SA of the said strip (with said dimension Ws x Ls) with SA <70%, the said supply speed (achieved by the first feed conveyor) can become.
    According to a further elaboration, in the case of a degree of filling SA of the said strip (with dimension Ws x Ls) with SA> 80%, the said supply speed is lowered.
    The present invention further provides a system with which the above-mentioned shortcoming is addressed, wherein the system is characterized in that the detector is directed at the said at least one partial current, wherein when an interruption is observed that extends over an intermediate distance B> 0.5 cm speed control signals are output by the processing unit whereby at least the difference between the feed speed and the feed speed is changed.
    It is achieved in a very suitable manner, not only that empty positions in packaging units are prevented, but above all that a continuous flow without stopping moments is obtained.
    The said system is in particular designed for carrying out a method according to the invention.
    According to a further elaboration, said detector may comprise a CCD camera.
    According to a further elaboration, in the transport direction following the transit conveyor, a packaging conveyor can further be provided, which is arranged for transporting packaging units, wherein the products are transferred from the transit conveyor during use into the packaging units supplied by said packaging conveyor.
    An apparatus and method for counting eggs is explained in EP 1856971. More specifically, this method of counting is applied to eggs, just after laying and then collected on conveyor belts, which catch the eggs from the cages and transport them to a collection location. In such a route the conveyor belts will be stopped if no eggs are supplied from the cages.
    Consequently, stopping and raising such a conveyor can cause eggs to roll in the wrong direction and thereby cause an incorrect count. To obviate such a problem, the invention described in this document uses an image processing program in which parts of an egg's contours are recorded for further use, for example for comparing contours obtained at earlier moments. In this way counting positions can be increased or reset. The images are obtained with a camera with a CCD sensor surface that can be switched so that different surface parts thereof can accordingly be considered as separate cameras. Unlike in the invention described below, according to this document a detector is by no means used for monitoring and detecting interruptions in a continuous continuous flow of products. Neither does this document describe driving speeds of successive conveyors on the basis of such observations.
    Further exemplary embodiments of the method and system according to the present invention are set forth in subclaims and will be discussed in detail below and appended to with reference to a drawing.
    More specifically, the drawing comprises FIGURE 1, which schematically shows a top view of the system according to an exemplary embodiment of the present invention; FIGURE 2, which schematically shows a top view of first details of the system of FIGURE 1; and FIGURE 3, which schematically shows a top view of second details of the system of FIGURE 1.
    In the different FIGURES, the same parts, parts, and designations are indicated by the same numbers and symbols.
    FIGURE 1 schematically shows a top view of the system according to a non-hmitative exemplary embodiment of the present invention. In this example, the system is provided with a first supply conveyor 1, and with a second supply conveyor 10 for supplying products to the first supply conveyor 1. Downstream of the first feed conveyor 1, a feed conveyor 2 and a packaging conveyor 3 are arranged. The system 1, 2, 3, 10 is adapted for transporting substantially spherical, substantially equally large products.
    In particular, the first feed conveyor 1 is arranged for feeding and advancing a stream of products over a substantially horizontal plane at a predetermined feed width Wi, to an output with a predetermined output width Wo, which corresponds to substantially the size of a predetermined number of N products, with N a natural number.
    The feed-through conveyor 2 is arranged in particular downstream of the first feed-in conveyor 1, for taking over the products from the feed-in conveyor 1 at a specific feed-through speed.
    The system comprises at least one detector D for monitoring and detecting said current, whereby detection signals are obtained during use.
    The system further comprises a processing unit U for processing at least the said signals into control signals.
    With the aid of this system, during use, the substantially spherical and substantially equally large products, more particularly eggs, in a conveying direction T, are randomly positioned on the second feed conveyor 10 at the beginning, ultimately grouped in rows and columns of a packaging unit 4 transferred to the packaging conveyor 3, and finally transferred for further processing and transport. In the intermediate part of the system (ie between the second feed conveyor 10 and the packaging conveyor 3) the products are successively taken over and processed by said first feed conveyor 1 and the feed conveyor 2. In that intermediate part the products are arranged and positioned to can be properly accommodated in the packaging unit 4 with nests 41. The transitions between the successive conveyors, namely the second feed conveyor 10, the first feed conveyor 1, the feed conveyor 2, and the packaging conveyor 3, are indicated by dotted lines (protruding outside the continuous boundaries of the conveyors), perpendicular to the plane of the drawing. the transport direction T.
    In the case of transporting and processing eggs, these conveyors are generally endless conveyors, with flat belts for the second feed conveyor 10 and the first feed conveyor 1, substantially in a horizontal plane. The eggs lying thereon are carried away by the friction, whereby every now and then eggs can perform small reciprocating movements. Due to this egg shape, the eggs with the long axis lie substantially perpendicular to the direction of transport and can roll around this axis.
    With a sufficient supply of eggs, a continuous flow of eggs is obtained, but without a fixed pattern. It is precisely because of the said rolling movement that the pattern can undergo small changes in detail. It is precisely these changes that give rise to mostly short-term very local interruptions in the totality of such a stream.
    More in particular, further details are shown for the first feed conveyor 1. Indicated are the width on the input side of the feed conveyor Wi (measured in a direction transverse to the conveying direction T), and the width on the output side Wo (also measured in a direction transverse to the conveying direction T), which in the are generally substantially interconnected. More in particular, the stream extending upstream over the entire width is divided into subflows 1a, 1b, 1c, 1d, 1c, 1f on the output side of the first feed conveyor 1. Such subflows 1a-1f can be obtained with so-called intermediate verges 11 , 12, 13, 14, 15, for example with a distribution system as described in EP823208. The distances between these intermediate verges and thus the width of such a partial flow will essentially correspond to a characteristic size of a product, ie an egg, with in this case rolling and moving the length of an egg (length measured along the long axis). This is further explained in said EP823208.
    As explained above, no products may be missing from the transfer of the products, more in particular eggs, from the first feed conveyor 1 to the feed conveyor 2. More in particular, high demands are made on the flow-through behavior of the products in the sub-streams la-lf.
    In a special application of the system according to the invention, the feed conveyor 2 is an endless roller conveyor, wherein the products, more in particular eggs, are arranged in a row in the conveying direction T on pairs of consecutive rollers. These rollers can rotate so that the eggs will also rotate in a controlled manner about their long axis. In a further embodiment, a part of such a roller conveyor can be arranged such that the eggs are aligned. This means that in the case of an arbitrary flow where on average the same number of eggs point with their point in one direction or the other (in the direction of their long axis, perpendicular to the direction of transport), the eggs in a downstream part of this feed conveyor 2; then all eggs are turned with their point in the same direction.
    The latter is very desirable because transfer of eggs in a packaging unit preferably takes place with the tip down. Such conveyors and transfer systems are described in, for example, EP512585.
    In FIGURE 2, further details are shown of the view according to FIGURE 1. On the basis of this FIGURE 2, details about the flow behavior of eggs E on the first feed conveyor 1, and more particularly about the control thereof and about the steps to be followed therefor method are explained.
    As already explained above, in the exemplary embodiment shown here, a stream of eggs E is divided into subflows 1a-1f, namely six tracks or rows (in this non-limitative example). The eggs E must be transferred column by column from the first feed conveyor 1 to the feed conveyor 2. Because each column must ultimately correspond to a column in a packaging unit 4, more particularly a tray with nests 41, all transfer positions must be surrender also to be filled. The aim is to maintain and maintain a continuous product flow with this system and this method from the very first supply of products to further processing of the filled packaging units, without fixed stopping moments.
    In the situation shown, it will apply to a continuously running stream that the conveyors will all move in the conveying direction T at substantially the same speed.
    FIGURE 2 shows the situation in which an interruption B has occurred in one of the sub-streams, here sub-stream 1c. It is true that the eggs E will be moved by the first feed conveyor 1 on which they are situated, but there is a risk of an unoccupied location at the time of transfer to the feed conveyor 2. To make such a situation controllable, a first detector is placed above the system with which the current can be observed and monitored. More specifically, a camera or camera system, for example a single camera or multiple cameras with CCD image processing, is used as the first detector, with which a part of this current is monitored. It will be clear to any person skilled in the art that other types of detectors can be used, for example CMOS, laser beams, photocells, or combinations thereof. A first detector is shown schematically in Figure 2, with dashed lines and corresponding reference sign D.
    The distances between the eggs are discussed in the explanation below. Because the current is monitored with said detector (for example cameras), hereinafter the distances will be discussed, namely the distances that the eggs have to bridge in order to lie against each other. On the other hand, the transport distance between the eggs is not intended and applied, because it means the positions of eggs on the conveyor, for example a flat conveyor belt. In the latter case, the size of each egg will have to be taken into account, for example when rolling, and therefore when rotating around substantially the long axis. In that case, account must be taken of both the above-mentioned intermediate distance and half the width (about half of the short axis) of each egg.
    It is generally known that image signals are obtained with said detector, which signals can be processed into control signals in a processing unit of such a system. A said processing unit is schematically drawn in Figure 1, with dashed lines and associated reference sign U.
    According to the present invention, the control (which can be effected by said processing unit) can be set in such a way that, in the event of an interruption B in the interval of 0.5 cm, intervention is made in the setting of the speeds of these conveyors 1, 2, namely so that the difference between these speeds is changed. In general, this will mean that the speed of the feed conveyor 2 is reduced so that the hole B is given more time to fill up.
    It is noted that in the event of a speed difference between the first feed conveyor 1 and the feed conveyor 2, for example the situation where the first feed conveyor 1 has a higher speed than the feed conveyor 2, there will be no accumulation in advance or surrender because only transfer can take place as the transport location of the transit conveyor 2 is also in the correct transfer position. Such a transfer procedure from a flat belt to a roller conveyor is generally known as has already been mentioned above.
    In the situation shown in FIGURE 2, the interruption B is close to the location of transfer from the first supply conveyor 1 to the feed-through conveyor 2. Since the partial flows generally have a length of more than 0.1 m, it is not desirable for small interruptions already B to apply the above-mentioned strict regime of 0.5 cm on the upstream side. According to a further embodiment of the present invention, in order to be able to control in the case of an interruption B at the further upstream in a sub-stream la-lf, such a sub-stream is divided into a number of n sections Si, with i = Ι, .,., η, with appropriate spacings Bi. associated with those sections Si. Said sub-syrup can thus be divided into at least two sections Si, S2, with Si on the downstream side, with corresponding intervals Bi, B2, for which Bi <B2 applies. If, for example, Bi = 0.5 cm is set, then it appears that B2 can be controlled appropriately with B2 = 1.0 cm.
    The division of sub-streams into more than two sections Si (i.e. n> 2) with corresponding suitable Bi has proved to be very advantageous. Similar relationships as those for Bi and B2 will then also be applied. In general, Bi Φ Bi + 1 will apply. It is noted that in the case of an interruption in an intermediate section it may prove to be advantageous to increase the speed of the first feed conveyor 1 instead of reducing the speed of the feed conveyor 2. It will be clear to any person skilled in the art that the sizes of the intermediate distances Bi generally increase with increasing i; however, other choices can be made. Furthermore, the values of the intermediate distances can be set and selected, partly on the basis of material properties, for example those of the conveyor belts or mats, and those of the rollers.
    A further exemplary embodiment of the present invention will be elucidated with reference to FIGURE 3. In this FIGURE other details of FIGURE 1 are shown, more in particular a part of the transition from the second supply conveyor 10 to the first supply conveyor 1. This second feed conveyor 10, like the first feed conveyor 1, is an endless conveyor, more in particular a flat belt, wherein these conveyors 1, 10 are generally closely connected to each other. A strip with supply width Ws and supply length Ls is indicated for the downstream side of this second conveyor 10. As mentioned, said length Ls can be at least 0.01 m. It has proved to be of great importance to follow the SA filling level of this area. It will be clear to any person skilled in the art that interruptions in the stream in that area can be preceded by possible interruptions B in the aforementioned sub-streams la-lf.
    In order to be able to observe and follow the said filling degree SA, at least a second detector is used. As for the said first detector, this second detector can be of the types mentioned there. In most cases, the degree of filling SA will be measured as an optical covering, namely the percentage of area that is viewed from above (or also from below), whether or not covered by the passing products, in the present case eggs. In contrast to the subflows 1a-1f where interruptions in a subflow in the transport direction were followed, an area across the full width Ws is considered when following the degree of filling SA.
    Furthermore, it will be clear to any person skilled in the art that this second detector can form a whole with the first aforementioned detector, for example by assigning pixel areas for one or the other camera in a camera of the CCD type. It is clear to every expert how other types of camera systems as mentioned above can be mounted and switched.
    It has been found that if the filling level SA of at least 70% is selected for the area hatched in FIGURE 3 of dimension Ws x Ls, a continuous flow can be maintained with great advantage. If upon observation this filling degree becomes smaller, the speed of the first feed conveyor 1 is lowered, and vice versa. If the filling degree is greater than 80%, this generally means too many products, or self-accumulation. A possible measure is then to lower the speed of the second feed conveyor 10 or to increase that of the first feed conveyor 1. Also for this situation it applies that a different criterion can be set depending on material properties, for example.
    It will be apparent to one skilled in the art that the invention is not limited to the example described, and that various modifications are possible within the scope of the appended claims.
    权利要求:
    Claims (12)
    [1]
    Method for controlling the flow of a stream of substantially spherical and substantially equally large products, for example eggs, on the basis of control signals, wherein in a conveying direction T a continuous stream of mutually randomly positioned products supplied in random order is formed , comprising successively, - supplying and advancing said flow at a predetermined supply speed from a first supply conveyor (1) over a substantially horizontal plane at a specified supply width Wi, to an output with predetermined output width Wo corresponding to substantially the measure of a predetermined number of N products, with N a natural number, wherein at least over part of the feed conveyor (1) on the downstream side, prior to the said output, N partial flows (1a-1f) are formed, a specific transit speed of a transit conveyor (2), arranged downstream of the feed conveyor (1), taking over the products from the feed conveyor, - monitoring and observing said current with at least one detector, whereby detection signals are obtained, and - processing at least said signals into control signals with a processing unit, characterized in that upon observing, in at least one subflow (1a-1f) of said N subflows, an interruption extending over an intermediate distance B> 0.5 cm, at least the difference between the feed speed and the feed speed is changed .
    [2]
    Method according to claim 1, characterized in that the speed of the feed conveyor (2) is reduced.
    [3]
    Method according to claim 1 or 2, characterized in that said at least one partial stream (1a-1f) is divided into at least two sections, S 1 as the most downstream section, and S 2 as a subsequent section, with corresponding intermediate distances B 1, B 2 , for which Bi <B2.
    [4]
    A method according to claim 3, characterized in that said at least one partial stream (1a-1f) is divided into more than two sections Si, with i a natural number with i> 3, with associated intermediate distances Bi for which at least Bi 1 applies Bi + 1.
    [5]
    Method according to one of claims 1 to 4, characterized in that prior to feeding the products with said feed conveyor (1), the products are supplied as a feed stream of products with a preset feed speed of a second feed conveyor (10) are supplied to the feed conveyor over a substantially horizontal plane, - wherein the feed stream has a feed width Ws with Ws> Wi, - wherein the feed stream is monitored and observed with at least a second detector whereby second detection signals are obtained which are processed by the processing unit into second control signals, - in which a strip on the downstream side with supply width Ws and supply length Ls of at least 0.01 m is monitored and observed, and - wherein in the case of degree of filling SA of said strip with dimension Ws x Ls with SA <70% said supply speed is increased.
    [6]
    Method according to claim 5, characterized in that in the case of a degree of filling SA of said strip with dimension Ws x Ls with SA> 80%, said supply speed is reduced.
    [7]
    Method according to one of the preceding claims, characterized in that the products are passed through for packaging in a packaging unit.
    [8]
    8. System for controlling, on the basis of control signals, the flow of a stream of substantially spherical and substantially equally large products, for example eggs, wherein in a conveying direction T a progressive stream of mutually randomly positioned and supplied in random order is formed , comprising, - a supply conveyor (1) for supplying and advancing said current at a predetermined supply speed over a substantially horizontal plane at a specific supply width Wi, to an output with a predetermined output width Wo corresponding to substantially the size of a predetermined number of N products, with N a natural number, wherein at least over part of the feed conveyor (1) on the downstream side, prior to said output, N partial flows are formed, - a feed-through conveyor (2) arranged downstream of the feed conveyor (1), for a well taking over a determined transit speed of the products of the feed conveyor, - at least one detector for monitoring and observing said current, whereby detection signals are obtained, and - a processing unit for processing at least said signals into control signals, characterized in that the detector is directed to said at least one partial flow, wherein upon detection of an interruption extending over a distance B> 0.5 cm, speed control signals are output by the processing unit, wherein at least the difference between the supply speed and the transfer speed is changed.
    [9]
    A system according to claim 8, characterized in that, furthermore, a second feed conveyor (10) in advance of the feed conveyor (1), for supplying the products as a feed stream of products with a preset feed speed over a substantially horizontal plane, with a supply width Ws with Ws> Wi for the second feed conveyor (10).
    [10]
    10. System as claimed in claim 9, characterized in that at least a second detector is included, which is directed to the supply current for monitoring and observing thereof, whereby second detection signals are obtained which are processed by the processing unit into second control signals, wherein a strip is monitored and observed on the downstream side with supply width Ws and supply length Ls of at least 0.01 m.
    [11]
    The system according to any of claims 8 to 10, characterized in that said detectors comprise a CCD camera.
    [12]
    A system according to any one of claims 8 to 10, characterized in that in the transport direction T following the transit conveyor (2) a packaging conveyor (3) is furthermore provided for transporting packaging units in which the products are transferred from the transit conveyor into the packaging units.
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    同族专利:
    公开号 | 公开日
    NL2008373C2|2014-03-31|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO1992009483A1|1990-11-26|1992-06-11|Mckinlay Bruce A|Egg packer apparatus|
    WO2007000441A1|2005-06-28|2007-01-04|Unitec S.P.A.|Method and system for conveying and selecting fruit and vegetable products|
    US20090020395A1|2007-07-17|2009-01-22|Anthony Accettura|Egg orienting and accumulating system with forward and reverse interconnected conveyors for preventing egg overflow/ride up and prior to existing in individual rows upon spool bars|
    法律状态:
    2015-09-02| V1| Lapsed because of non-payment of the annual fee|Effective date: 20150901 |
    优先权:
    申请号 | 申请日 | 专利标题
    EP11001657|2011-03-01|
    EP11001657|2011-03-01|
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