NL8500423A - METHOD AND APPARATUS FOR SELECTING OBJECTS FROM A GROUP SUCH AS A CATCH OF WATER ANIMALS FROM SIMILAR OBJECTS SUCH AS SHRIMPS - Google Patents

Description

1.

Method and device for selecting similar objects such as shrimps from a group of objects such as a catch of aquatic animals.

The invention relates to a method for selecting at least the similar non-flat, elongated objects such as shrimps from a group of objects such as a catch of aquatic animals.

Such a method is generally known and is used, for example, on shrimp cutters in order to select the desired shrimp from the aquatic animals caught with a trawl tow. In addition to shrimps, such a catch contains, for example, crabs and flatfish in various sizes. The aquatic animals that are thicker than shrimp are first removed from the catch in an oversized sieve because they remain on the oversized sieve and can be removed from there. The aquatic animals that have fallen through the oversized sieve are then sieved again with an undersized sieve, whereby the undersized shrimps and all remaining aquatic animals with a thickness smaller than the undersize are removed from the catch and can be thrown back into the water.

The current catch mainly contains shrimp 20 but can still contain a considerable amount of small flatfish and crabs. These must still be removed by hand. In shrimp fishing, this is usually done after the catch has been cooked in the cooking pot. The shrimp, which has become sterile by cooking, can again be contaminated with undesired bacteria by this after selection. If the catch still contains a considerable number of aquatic animals other than shrimp after sieving, the post-selection takes an undesirably long time. This means that shrimp cannot be caught in certain fishing areas because the final catch after sieving still contains so many unwanted objects that processing such a catch is not economically feasible.

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The object of the invention is to provide a method with which the above-mentioned drawbacks can be remedied.

This object is achieved in an above-described method according to the invention by directing the objects in a longitudinal direction and transporting them in the longitudinal direction to passage openings with substantially equal dimensions in mutually perpendicular directions and discharging on the other side of the passage openings. .the selected objects. This has made it possible to select the shrimps almost completely from the catch consisting of objects in one size group, without this entailing an undesired loss of shrimp in a part of the size group. When the group of objects comprises a relatively large part of small objects, according to the invention the method can be extended by removing objects before or afterwards with a thickness of less than one undersize. The re-selection does not yet need to be done very incidentally. Even catches which largely consist of objects other than the desired shrimp, can be economically and cleanly used with the method according to the invention. are processed.

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When the method according to the invention is used for the processing of shrimps, a particularly favorable embodiment is obtained when, according to the invention, the objects with a thickness dimension smaller than an undersize are subsequently removed by boiling the selected objects in a usual manner. and then orient the cooked selected objects 30 in a longitudinal direction and transport them to the passageways, and discharge the removed objects on the other side of the passageways. By cooking, the originally straight shrimps acquire a curved shape, so that they can no longer be moved through the passage openings in this condition. The small objects «·

which were originally selected, disappear through the openings, so that they can be discharged on the other side and only for the openings, BAD ORIGINAL

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It has been found in practice that when used for selecting shrimps, an optimum result is achieved when, according to the invention, the passage openings are around 5.

The invention also relates to and provides an apparatus for selecting at least similar non-flat, elongated objects such as shrimps from a group of objects such as a catch of aquatic animals. According to the invention, this device comprises a screen device comprising guiding means provided with aligning elements for aligning the objects in their longitudinal direction and passage openings extending transversely to the longitudinal direction defined by the aligning elements, with substantially equal dimensions in mutually perpendicular directions. for relatively moving the objects and the passage openings towards each other, and discharge means communicating with the space below the passage openings.

A favorable embodiment of the device according to the invention is obtained when the sieving device comprises a plate-shaped member which is provided with the elongated elongating means. grooves in an upper surface and / at one end of each groove include a concentric passage opening therewith.

An embodiment of the invention which is particularly suitable for shrimp processing is obtained when the plate-shaped member is designed as a drum rotatably mounted on a frame, wherein drive means connected to the frame can drive the drum in a direction of rotation, and the passage openings are arranged are at the "rotational rear end of each groove.

During the rotation of the drum, the shrimps automatically arrange themselves in the grooves and are taken upwards with the drum wall, after which they slide into the groove by gravity and move through the passage opening. Objects that cannot pass through the openings, but which can get caught in them, are lifted with the drum wall and generally fall again at the bottom BAD ΟΒΙξΙΝΑΙ. , 9 ^ 'p *' V, t} / v - <* V / 4 upward movement of the drum wall by gravity back into the interior of the drum. The oversized objects, including aquatic animals but also aquatic plants, are discharged from the inside thereof at the end of the drum.

When, according to a further development, water supply means are provided which are provided with downwardly directed water jets on the jet nozzles which direct downwardly moving during rotation, which direction directs the downwardly moving downwardly moving jet nozzles. outer surface part upwards. be open, do not get clogged. Any clamping objects are sprayed loose by the water jets.

In a favorable embodiment, the grooves are bounded by continuous ridges extending to a level above the passage opening. Flatfish and the like remain on the ridges and thus do not obstruct the passage to the passage openings. According to a further development, when the grooves are arranged according to helical lines, the objects not passing through the passage openings are automatically discharged to one end as a result of the rotation of the drum.

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A very important additional advantage of the method and device according to the invention is that it can produce a product which is considerably less contaminated than the product obtained in the usual manner. After sieving, the remaining part of the catch is cooked directly on board the fishing vessel in a cooking pot. Flatfish and the like still present in the sieved catch completely or partially disintegrate by this cooking. After taking the shrimps out of the cooking pot, they are mixed with remnants of organic material that are very sensitive to spoilage and can affect the taste of the shrimps. For this reason, the catch is rinsed with large amounts of sea water after cooking in order to remove the aforementioned residues. Thus, in the known processing method, the sterile catch after cooking is again contaminated with bacteria from the sea water. Because BAB, Opi <3IWAL,,

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• With the invention a clean product is obtained, after cooking the catch does not need to be rinsed with large amounts of water. The catch need only be cooled. This requires a considerably smaller amount of water. The required quantity is such that tap water from the port can be taken on board the ship for this cooling. When the invention is used, the shrimps therefore only come into contact with virtually germ-free tap water after cooking, instead of sea water heavily contaminated with bacteria. Advantageously, only a small amount of tap water is required to cool the cooked shrimp when. this cooling water itself is cooled again by heat exchange with sea water.

This can be done, for example, by making the reservoir in which the cooked shrimps are cooled with the cooling water double-walled and by pumping the double-wall seawater.

Further features and advantages of the invention will appear from the following description of some preferred embodiments.

FIG. 1 shows a partly broken away perspective view of a screen of a device according to the invention, for carrying out the method according to the invention.

Fig. 2 shows a detail view of part of FIG.

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Figures 3 and 4 show perspective detail views of other embodiments of the screen according to the invention.

Fig. 5 shows a partly broken away perspective view of a sieve device according to the invention.

Fig. 6 shows a perspective view from above of yet another embodiment of the screen according to the invention.

Fig. * 7 shows a perspective view of a sieve device with a sieve designed as a drum according to the invention.

Fig. 8 shows a partly cut-away and broken away perspective detail view of a sieve according to the invention lined as a drum made of BADO 2.

Fig. 9 schematically shows a partial axial section of FIG. 8.

Fig. 1 shows a screen device according to the invention.

The device 1 comprises a frame 2 with which a screen frame 4 is hingedly connected by means of supporting arms 3. The screen frame 4 is provided with a screen 5 to be further described. As shown, the device 1 is designed as a shaking screen, in which a rotating shaft 6 is mounted in the frame 2 for driving the shaking movement. an eccentric 7 mounted on a carrying arm 3. Thus, when the shaft 6 is rotated, the carrying arm 3 is moved back and forth in the direction of the arrow 8. The screen 5 thus carries a reciprocating movement here. from oblique on its plane. In a known manner, this movement has the result that objects brought to the front of the sieve 5 are gradually transported backwards, while they are continuously moved.

The sieve device 1 is intended to be used for selecting shrimps from a catch, from which the sea animals with a thickness larger than a certain size and the sea animals with a thickness smaller than a certain undersizes have been removed. The remaining catch therefore contains prawns 15 that are to the measure, but also, for example, spare ribs 16 and flatfish 17 with the same thickness as the prawns 15. To select the prawns 15 from this remaining catch, all objects from the ... catch 30 directed in a longitudinal direction and guided in this directed state to passage openings, which passage openings have substantially equal dimensions in mutually perpendicular directions. The shrimps can move through the passage openings in this directed state, since these shrimps are approximately as wide as they are thick in cross section. In terms of cross-section, flatfish and spare ribs 17 and 16 have a clearly larger width than thickness, and because of the previous sieving operations these leftover spare ribs and

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a r η n h o% 7 flatfish having a thickness corresponding to the thickness of shrimp 15, their width is considerably greater than this thickness, so that they cannot move through the passage openings. Only the shrimp 15 kunneq. so move through the sieve and the 5 other objects such as flatfish and spare ribs are removed at the top at the back of the sieve.

In the embodiment of the sieve 5 shown in Figs. 1 and 2, the orienting means are elongated grooves, which are determined by the wave valleys of their wave-shaped profiling. In these grooves 10, the objects 15-17 are oriented in their longitudinal direction due to the shaking movements of the screen 5. Moreover, by the movements of the shaking sieve, the objects are moved over the surface of the sieve 5, so that the objects lying in the grooves 10 are transported to the passage openings 11. As Fig. 2 shows, these openings 11 allow shrimp 15 to pass through, but other objects such as spare ribs 16 and flatfish 17 do not. The passage openings 11 are formed at the location where the passage elements 12 adjoin the grooves 10. In the embodiment shown, the passage elements are also determined by a corrugated profiling of the sieve 5 made of sheet material. This profiling is relative to the profiling determining the grooves 10. offset by half a wavelength. In the embodiment of Fig. 2, a transition profile is formed between the two said profiles, in which the wave valleys of the respective profiles continue. At the location of the connection of a wave trough 10 of one profile to a wave crest of the other, a cut is formed in the plate 5, which defines a passage opening 11. As clearly shown in Fig. 2 ', passage openings 11 are turned in two mutually opposite directions, so that the shaking movement of the sieve is optimally utilized. Although not shown in the figures, the edges of the passage openings 35 can be funnel-shaped, so that the shrimp do not get stuck behind these edges.

Although the desired waveforms can easily be pressed into sheet material, in order to obtain a BAD ORIGINAL ·, "0 0 UU" i L 8 according to the "features of the invention, sufficient sieving device," it is of course also possible to use such a sieve device to be manufactured in a different manner, for example from wire material.

5-Fig. 3 shows another embodiment of a plate screen according to the invention. This screen 20 is also made of corrugated profiled sheet material. Two waveforms indicated by resp. 21 and 22 are alternately pressed into the plate. The waveform 22 has twice the wavelength 10 and twice the amplitude as the waveform 21. A wave trough of the waveform 22 always coincides with a wave trough of the waveform 21, so that the intermediate wave troughs of the waveform 21 are always in line of the wave crests of the waveform 22. At the location of the transition, the apertures 23 are thereby formed, which in the present case have an approximately square shape. Here too, the orienting means are formed by the wave valleys 24.

The sieve 25 of Fig. 4 is made from a corrugated sheet with a trapezoidal corrugated profile. The wave valleys 26 again form the guide elements. At certain locations, a portion 27 of the corrugated sheet consisting of one part of the corrugated bottom plus the two adjacent upright walls has been removed. A plate 28 is arranged above this section 27. The passages 29 are formed under the edges of the plate 28.

In the device 30 shown in Fig. 5, both the top-sized screen, the bottom-sized screen and the screen according to the invention are combined. The device 30 comprises a frame 31 on which a screen frame 32 is mounted by means of movable supports 33. This screen frame 32 can be moved by means of the movement device 34 in a desired movement, for example one. shaking movement are brought with respect to the frame 31. The oversize screen is formed by the rod-shaped elements 38 arranged at an intermediate distance corresponding to the oversize. Seen in fig. 5, the catch is dumped on the left of the screen. Objects from the catch that are larger than the oversize defined by the spacing of the rods 3 "è become as a result of the

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the movement device 34 generated movement to the right above the bars 38 is conveyed to the discharge end 39, where these oversized objects are discharged. The objects smaller than the oversize fall between the 5 bars 38 and end up on the undersize sieve 35, which is formed by the sieve elements 36. These bar-shaped elements 36 have a substantially quadrilateral cross section, each with two adjacent elements 36 with a longitudinal rib facing each other. The spacing between the facing ribs is equal to the undersize. The objects with a thickness smaller than this undersize thus fall between the sieve elements 36 and are collected under the left part of the sieve device.

Through the quadrilateral cross section of the rod shape. screen elements 36 are formed on either side of each slot of the undersize screen 35 defined between the facing ribs and mutually converging guide walls. These ensure that objects such as flatfish are moved on their side, so that the piatvis 20 with a thickness smaller than the undersize are definitely discharged through the undersize sieve 35 and cannot remain on the slots. The danger of this would be that flatfish with a thickness smaller than the one clog the openings of the additional sieve 42.

As a result of the action of the bars 38 and the sieve elements 36, between them there are thus left objects with a thickness in the group defined by the upper and lower sizes.

As a result of the movement of the sieving device, which has been generated as a result of the movement device 34, these objects, including all the shrimps 41 which are to the measure, seen in Fig. 5, move to the right to the additional sieve 42 according to the invention. In the manner described, the additional shrimp 41 discharges the shrimp 41 at the bottom 35, as indicated at 43, while the other objects, such as the aforementioned flatfish and spare ribs, are discharged over the additional screen 42 to the discharge end 39.

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The plate-shaped member 51 of Fig. 5 is profiled with a pressing operation. In the plate, ridges 55 are pressed, which are at an angle to each other

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upright sidewalls 52 of the ridges 55 form the guiding elements with which the elongated objects such as shrimps are oriented in their longitudinal direction. This is done by a relative movement of the plate 51 relative to the objects lying thereon in the direction of arrow 54. ' The objects on the screen 51 move relatively in the direction opposite to arrow 54 and are guided through the guide walls 52 to the openings 53. When the cross-sectional shape of these objects is smaller than that of the opening 53, these objects through the openings 53.

In the device 58 of Fig. 7, the plate-shaped member is designed as a drum 60. The drum 60 is rotatably mounted on a frame 59 .. At the front, the drum comprises a flange 61 which is supported by flange wheels 62. As a result, the drum locked in axial direction.

At the rear end, the drum 60 is provided with a cylindrical track 63 which cooperates with smooth wheels 64. The wheels 64 are mounted in a support 65 of the frame 59. The support 65 is adjustable in height in order to adjust the tilt angle of the drum 60 relative to the frame 59. On one of the wheels 64, a drive device 66 engages the wheel 64 and thereby rotates the drum.

At the higher level rear end of the drum 60, a feed chute 67 is provided which opens into the interior of the drum. The drum 60 is designed such that the aperture openings 70 are each arranged at the rear end of each groove 69 in the direction of rotation 68.

During the rotation of the drum 60, the catch brought via the chute 67 into the interior of the drum is set in motion. The shrimps are hereby received in the longitudinal direction in the grooves 70 and are moved upwards over a certain distance. As a result of the gravity BADORfèl ^ 1AlfCi1UVen 9 shrimps then in the relevant / ¾ C Λ Λ 1 o 1? ···. I '! It grooves 69 towards the through-hole 70 and drop therethrough. The shrimp moving through the passage openings 70 fall onto the transport device 72 which is arranged under the drum. This transport device 72 comprises a transport belt 75 which is guided around a roller 73. The roller 73 is driven in rotation by a drive device 74 such that the upper part of the conveyor belt 75 moves in the direction of the arrow 76. The selected shrimps are thus removed with the conveyor belt 72. The catch objects that cannot pass through the passageways gradually descend into the drum 60 and finally come out in the direction of the arrow 80 from its lower end, where they fall into the drain bin 81. Instead of a tray, a drainage device, for instance in the form of a drainage gutter, can also be arranged.

An important aspect of the sieve device designed in this way is that the objects which possibly catch on the passage openings 70 and are carried upwards on the opposite side of the drum, ie on the downward moving part, under the influence of the gravity and come out of the passages 70. In order to ensure that indeed the objects protruding into the passage openings 70 come loose therefrom, a water supply device 84 is provided with a number of jet nozzles 85 which jet downwards in the direction of the arrow 86 on the outer surface part 83 of the rotating surface which moves downwards. aim the drum. On the outside, the openings 70 in the downwardly moving wall part 83 are open upwards, so that the. water jets 30 can spray out any hooking objects with full force. "The objects thus released by gravity, possibly in combination with the water jets, are re-introduced into the interior of the drum and eventually move out from the lower end thereof. Next to the drum Screens 82 are formed on the frame and form a shield for splashing water. * The screens 82 can be adjusted to a suitable distance by means of the transverse adjusters 87.

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Fig. 8 and 9 show a preferred embodiment of a drum-shaped plate member according to the invention. This drum is made of synthetic material by injection molding. As a result, the surface of the drum has no sharp edges, so that unnecessary damage to the shrimp and other aquatic animals is prevented. Manufacturing does not have to be done in one run. The drum may also suitably be made up of a number of identical segments.

The drum 89 comprises as guiding means the previously described grooves or troughs 92, which debouch at their rear ends in the direction of rotation 94 in a passage 90. The grooves 92 are bounded by a continuous extending above the passage openings 90 Ridges 91. On the one hand, the ridges 91 contribute to the aiming of the shrimps or corresponding objects and on the other hand ensure that larger objects, such as, for example, flatfish and crabs, cannot end up in front of the openings 90 but remain on the ridges 91.

20. As can be seen in relation to the end edge 96 of the drum, the grooves and ridges extend helically along the circumference of the drum. As a result, objects lying on the backs such as flatfish are automatically transported to the drain in the direction of arrow 95.

As shown in Fig. 9, the drum 89 is designed in such a way that divergent wall parts 93 extend behind the passage openings 90. These wall parts 93 ensure that the objects passing through the openings 90 continue to move in their longitudinal direction during this passage, so that they do not get jammed by tilting. In addition, this configuration facilitates the loosening of objects partially caught in the opening 90. The water jets which, when the respective wall part moves downwards, are directed inwards in the direction of arrow 97 at the rear of the openings 90, are guided well so that the action thereof is enhanced. Although the method and the device according to the invention are particularly suitable for removing from a BADOHMMli? Selecting 13 catch aquatic animals of shrimp can also be used for selecting similar objects from a different group of objects with a shape similar to that of shrimp. The invention can therefore also be applied, for example, in the sorting of vegetables and the like.

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Claims (16)

Method for selecting at least the similar, non-flat, elongated objects such as shrimps from a group of objects such as a catch of aquatic animals, characterized by aligning the objects in the longitudinal direction and in the longitudinal direction towards passage openings with transport substantially equal dimensions in mutually perpendicular directions and remove the selected objects on the other side of the • openings. Method according to claim 1, characterized by removing objects with a thickness of less than an undersize before or afterwards. Method according to claim 2 for processing shrimps, characterized in that the objects 15 with a thickness dimension smaller than an undersize are subsequently removed by subjecting the selected objects to a cooking treatment in the usual manner and subsequently cooked selected 'objects in ^. a longitudinal direction and transport to the passage openings, and the removal of the removed objects on the other side of the passage openings. 4. Device for selecting from a group of objects such as an aquatic animal catch at least the similar, non-flat, elongated objects such as shrimps, characterized by a screening device comprising guide means provided with alignment elements for aligning the objects in their longitudinal direction and transverse openings extending transversely to the longitudinal direction defined by the aligning elements, with substantially equal dimensions in mutually perpendicular directions, movement means for moving the objects towards each other in relative sense. and the passage openings, and discharge means communicating with the space below the passage openings. 5 ·. Device as claimed in claim 4, with the 3 BATH COOL <* INAle r k, that the passage openings are round. «• s'»? o A f o “y 6. Device as claimed in claim 4, characterized in that the sieving device comprises a plate-shaped member which is provided with elongate grooves forming a straightening means in a top surface and at one end of each groove has a concentric passage opening therewith. 7. Device as claimed in claim 6, characterized in that the plate-shaped member is designed as a drum rotatably mounted on a frame, wherein drive means connected to the frame can drive the drum in a rotation direction, and that the passage openings are arranged at the rear end of each groove in the direction of rotation. 8. Device as claimed in claim 7, characterized in that water supply means are provided which are provided with downwardly directed water jets on the jet nozzles which direct downwardly moving during rotation. 9. Device as claimed in any of the claims 6-8, characterized in that the grooves are bounded by continuous ridges extending to a level above the passage openings. Device according to any one of claims 7-9, characterized in that the grooves are arranged along helical lines. 11. Device as claimed in claim 6, characterized in that the plate-shaped member consists of at least locally corrugated profiled sheet material, the grooves being determined by the wave valleys and the duct plate elements by a relatively displaced wave-shaped profiling with corresponding wavelength, while the passage openings are formed by cuts in the sheet material at the point of connection of a wave trough of one profiling and a wave crest of the other profiling. · 12. Device according to claim 11, characterized in that the sheet material is stainless steel sheet and that the corrugated profiling is applied by pressing. BATH ORtpINAj. ,,, ^ .. 16 - Device as claimed in claim 6, characterized in that the plate-shaped member is manufactured by injection molding of synthetic material. Device according to any one of claims 4-13, 5, characterized in that. the edges of the passage opening and funnel are shaped. Device as claimed in any of the claims 4-14, characterized by an undersize screen with elongated slots with a width corresponding to an undersize, wherein the undersize screen on both sides of each slot is provided with guide walls converging towards the slot. 16. Device as claimed in claim 15, characterized in that the undersize sieve comprises a series of parallel rod-shaped elements with a substantially quadrilateral cross-section, wherein two adjacent elements in each case are facing one another with a longitudinal rib and the upper sieve has a series of parallel, the Difference between the oversize and oversize includes narrower rod-like elements mounted on them. / 'A BAD ORtGRNAL /} 4 2 3