A multi-stage screening and catching device for burying bivalves

Abstract

This invention relates to a multi-stage screening and harvesting device for burrowing shellfish, comprising a tow line, a frame, and a net. The tow line is connected to the frame, and the net is installed at the outlet of the frame. Inside the frame, from the inlet to the outlet, a first row of toothed rakes, a second row of toothed rakes, and a third row of toothed rakes are arranged sequentially. From the first row of toothed rakes to the third row of toothed rakes, the tooth spacing and the tooth angle of each rake gradually decrease. The tooth projection heights of the first row of toothed rakes, the second row of toothed rakes, and the third row of toothed rakes are all the same. This invention achieves multi-stage screening of shellfish by sequentially arranging the first, second, and third rows of toothed rakes inside the frame, with the tooth angle and tooth spacing of each rake gradually decreasing in sequence. The equal projection heights of the toothed rakes are to prevent the generation of new mud and sand during harvesting. Since the second and third rows of toothed rakes do not generate new mud, the resistance is naturally reduced, which is beneficial for harvesting.

Description

Technical Field

[0001] This invention relates to the field of shellfish screening and harvesting equipment, and in particular to a burrowing-type multi-stage screening and harvesting device for shellfish. Background Technology

[0002] Burrowing shellfish refer to shellfish that spend most of their time buried in the mud and sand at the bottom of the water, encompassing many species. Examples include: hard clams, flower clams, and yellow clams (also known as blue clams) are familiar burrowing shellfish.

[0003] Some burrowing mollusks inhabit the intertidal zone, while others inhabit the seabed mud and sand in areas that are covered by seawater year-round.

[0004] For burrowing shellfish that inhabit the intertidal zone, they can be harvested manually when the tide is out and the beach is dry. However, for burrowing shellfish that inhabit areas covered by seawater year-round, manual harvesting is obviously not feasible and can only be done with the help of machinery.

[0005] The existing underwater burrowing shellfish harvesting devices include the following types:

[0006] 1. Dragging rake: The dragging rake is a traditional tool for harvesting underwater burrowing shellfish. It consists of a rake connected to a net. Its main features are: simple structure, easy operation, and low manufacturing cost. However, because the rake is difficult to turn shellfish buried in mud and sand to the surface of the seabed, the capture efficiency is low. Therefore, it is rarely used in the production of burrowing shellfish.

[0007] 2. Towed Water-Flush Rake: Compared to the aforementioned towed rake, the most obvious feature of the towed water-flush rake is the addition of a "flushing" function. This "flushing" function is generated in two main ways: first, a high-pressure water pump on the fishing boat is connected to the fishing gear via an air hose and installed in front of the net, continuously generating a high-pressure water jet during towing; second, an electric motor driven by the fishing boat and installed in front of the net generates a powerful water jet. The towed water-flush rake washes away the mud and sand surrounding the shellfish, exposing a large number of shellfish to the seabed surface. The moving fishing gear then "collects" the shellfish into the net, achieving the harvesting purpose. The main characteristics of this fishing gear are: complex structure, high manufacturing cost, and high operating expenses. However, the "flushing" effect greatly improves the capture efficiency, making it a highly favored method for burrowing shellfish harvesting among shellfish fishermen.

[0008] For burrowing shellfish resources that inhabit seawater-covered areas year-round, a suitable harvesting device and its main structural features were invented to achieve the design goals of "safety and practicality, simple structure, convenient operation, low cost, and high harvesting efficiency". Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a multi-stage screening and harvesting device for burrowing shellfish. By sequentially arranging a first row of toothed rakes, a second row of toothed rakes, and a third row of toothed rakes inside the frame, and the tooth angle and tooth spacing of each rake gradually decrease in sequence, multi-stage screening of shellfish can be achieved. The equal projected height of the first row of toothed rakes, the second row of toothed rakes, and the third row of toothed rakes is to prevent the generation of new mud and sand during the process. Since the second row of toothed rakes and the third row of toothed rakes basically do not rak the mud, the resistance is naturally reduced, which is more conducive to harvesting.

[0010] The technical solution adopted by the present invention to solve its technical problem is as follows: a multi-stage screening and harvesting device for burrowing shellfish is provided, including a tow line, a frame and a net. The tow line is connected to the frame, and the net is installed at the outlet of the frame. Inside the frame, a first row of toothed rakes, a second row of toothed rakes and a third row of toothed rakes are arranged sequentially from the inlet end to the outlet end. From the first row of toothed rakes to the third row of toothed rakes, the tooth spacing of each toothed rake gradually decreases, and the tooth angle of each toothed rake gradually decreases. The tooth projection height of the first row of toothed rakes, the tooth projection height of the second row of toothed rakes and the tooth projection height of the third row of toothed rakes are all the same.

[0011] As a supplement to the technical solution described in this invention, ropes for connecting the traction cable are provided at each of the four corners of the frame.

[0012] As a supplement to the technical solution described in this invention, the end of the mesh garment is tied with a binding rope, the free end of which is connected to the frame.

[0013] As a supplement to the technical solution described in this invention, the tooth spacing of the third row of toothed rakes is X, ranging from 15mm ≤ X ≤ 40mm; the tooth spacing of the second row of toothed rakes is Y, ranging from X + 3mm ≤ Y ≤ X + 20mm; and the tooth spacing of the first row of toothed rakes is Z, ranging from Y + 3mm ≤ Z ≤ Y + 20mm.

[0014] As a supplement to the technical solution described in this invention, X is 15mm, Y is 18mm, and Z is 21mm.

[0015] As a supplement to the technical solution described in this invention, the angle between the inclined surface of the first row of toothed rakes and the horizontal plane is A, ranging from 40°≤A≤55°; the angle between the inclined surface of the second row of toothed rakes and the horizontal plane is B, ranging from 25°≤B≤40°; and the angle between the inclined surface of the third row of toothed rakes and the horizontal plane is C, ranging from 15°≤C≤25°.

[0016] As a supplement to the technical solution described in this invention, A is 45°, B is 30°, and C is 20°.

[0017] As a supplement to the technical solution described in this invention, the tooth projection height is D, and the range is 80mm≤D≤150mm.

[0018] As a supplement to the technical solution described in this invention, D is 100mm.

[0019] Beneficial Effects: This invention relates to a multi-stage screening and harvesting device for burrowing shellfish. By sequentially arranging a first, second, and third row of toothed rakes within a frame, with the tooth angle and spacing of each rake gradually decreasing in sequence, multi-stage screening of shellfish can be achieved. The equal projected height of the first, second, and third rows of toothed rakes prevents the generation of new mud and sand during harvesting. Since the second and third rows of toothed rakes do not generate new mud, resistance is naturally reduced, facilitating harvesting. Ropes for connecting to the towing line are provided at the four corners of the frame to ensure structural stability. The end of the net is tied with a binding rope, and the free end of the binding rope is connected to the frame, thus providing some support and cushioning for the net. This invention also has the advantages of simple structure, ease of use, and low manufacturing cost. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is an internal schematic diagram of the framework described in this invention;

[0022] Figure 3 This is a schematic diagram of the angles of the rakes inside the frame described in this invention;

[0023] Figure 4 This is a schematic diagram of the tooth spacing of each rake in this invention;

[0024] Figure 5 This is a schematic diagram showing the tooth projection height of each rake inside the frame described in this invention.

[0025] Diagram: 1. Drag line, 2. Frame, 3. Netting, 4. Restraint rope, 5. First row of toothed rakes, 6. Second row of toothed rakes, 7. Third row of toothed rakes, 8. Rope. Detailed Implementation

[0026] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0027] Embodiments of the present invention relate to a multi-stage screening and harvesting device for burrowing shellfish, such as... Figure 1-5 As shown, the system includes a traction line 1, a frame 2, and a net 3. The traction line 1 is connected to the frame 2, which has a rectangular frame structure. The front opening of the frame 2 is the inlet end, and the rear opening is the outlet end. The bottom of the frame 2 is also open. The net 3 is installed at the outlet end of the frame 2. Inside the frame 2, from the inlet end to the outlet end, there are a first row of toothed rakes 5, a second row of toothed rakes 6, and a third row of toothed rakes 7 arranged sequentially. From the first row of toothed rakes 5 to the third row of toothed rakes 7, the tooth spacing and the tooth angle of each rake gradually decrease. The tooth projection height of the first row of toothed rakes 5, the second row of toothed rakes 6, and the third row of toothed rakes 7 are all the same, meaning that the tooth projection height is kept at the same horizontal plane, and the tips of all teeth in any row are at the same horizontal plane.

[0028] The main function of the first row of toothed rakes 5 is to loosen the soil layer, filter out the mud and sand and large particles wrapped around the shellfish. As the harvesting device moves, it loosens the soil layer, filters out mud and sand particles and debris, and scoops the shellfish buried at the bottom of the soil layer to the surface. Therefore, it needs a relatively large tooth angle and tooth spacing.

[0029] The first row of toothed rakes 5 can also turn the shellfish to the front of the second row of toothed rakes 6. As the device moves forward, more and more shellfish accumulate on the first row of toothed rakes 5. After accumulating to a certain amount, the shellfish will continuously fall to the front of the second row of toothed rakes 6 and enter the fishing area of ​​the second row of toothed rakes 6.

[0030] The small teeth of the second row of rakes 6 make it easier to turn the shellfish to the third row of rakes 7. Since the teeth of the second row of rakes 6 are smaller than those of the first row of rakes 5, the shellfish can more easily turn over the second row of rakes 6. Moreover, after being screened by the first row of rakes 5, most of the mud and sand mixed in with the shellfish has been filtered out, and the purity of the shellfish on the surface is relatively high, so the spacing between the teeth can be further reduced.

[0031] The equal projected heights of the first row of rakes 5, the second row of rakes 6, and the third row of rakes 7 are to prevent the generation of new mud and sand during the harvesting process. Since the second row of rakes 6 and the third row of rakes 7 do not generate new mud, the resistance is naturally reduced, making harvesting easier.

[0032] The spacing between the teeth of the third row of rakes 7 is set according to the size of the shellfish to be harvested. For example, if you want to harvest clams with a size of 40 clams per kilogram, the spacing between the teeth of the third row of rakes 7 can be set to 15 mm, the spacing between the teeth of the second row of rakes 6 can be set to 18 mm, and the spacing between the teeth of the first row of rakes 5 can be set to 21 mm.

[0033] The tooth spacing of the third row of toothed rakes 7 is X, ranging from 15mm ≤ X ≤ 40mm; the tooth spacing of the second row of toothed rakes 6 is Y, ranging from X + 3mm ≤ Y ≤ X + 20mm; and the tooth spacing of the first row of toothed rakes 5 is Z, ranging from Y + 3mm ≤ Z ≤ Y + 20mm. Preferably, X is 15mm, Y is 18mm, and Z is 21mm.

[0034] The angle between the inclined surface of the first row of toothed rakes 5 and the horizontal plane is A, ranging from 40° ≤ A ≤ 55°; the angle between the inclined surface of the second row of toothed rakes 6 and the horizontal plane is B, ranging from 25° ≤ B ≤ 40°; and the angle between the inclined surface of the third row of toothed rakes 7 and the horizontal plane is C, ranging from 15° ≤ C ≤ 25°. Preferably, A is 45°, B is 30°, and C is 20°.

[0035] The tooth projection height is D, which ranges from 80mm to 150mm, and D is preferably 100mm.

[0036] The frame 2 is provided with ropes 8 at each of the four corners for connecting the traction cable 1 to ensure the stability of the structure; the end of the net 3 is tied with a binding rope 4, and then the free end of the binding rope 4 is connected to the frame 2, so that the binding rope 4 can also provide a certain support and cushioning effect for the net 3.

[0037] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0038] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0039] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0040] The above provides a detailed description of a multi-stage screening and harvesting device for burrowing shellfish provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A multi-stage screening and collecting device for burrowing shellfish, comprising a towing body (1), a frame (2) and a net (3), characterized in that: The frame (2) is connected to a traction line (1), and a net (3) is installed at the outlet of the frame (2). Inside the frame (2), from the inlet end to the outlet end, a first row of toothed rakes (5), a second row of toothed rakes (6), and a third row of toothed rakes (7) are arranged in sequence. From the first row of toothed rakes (5) to the third row of toothed rakes (7), the tooth spacing of each rake gradually decreases, and the tooth angle of each rake gradually decreases. The tooth projection height of the first row of toothed rakes (5), the tooth projection height of the second row of toothed rakes (6), and the tooth projection height of the third row of toothed rakes (7) are all the same. The tooth spacing of the third row of toothed rakes (7) is... X is the tooth spacing of the second row of toothed rakes (6), which is in the range of 15mm≤X≤40mm. Y is the tooth spacing of the first row of toothed rakes (5), which is in the range of X+3mm≤Y≤X+20mm. Z is the tooth spacing of the first row of toothed rakes (5), which is in the range of Y+3mm≤Z≤Y+20mm. A is the angle between the tooth slope of the first row of toothed rakes (5) and the horizontal plane, which is in the range of 40°≤A≤55°. B is the angle between the tooth slope of the second row of toothed rakes (6) and the horizontal plane, which is in the range of 25°≤B≤40°. C is the angle between the tooth slope of the third row of toothed rakes (7) and the horizontal plane, which is in the range of 15°≤C≤25°.

2. The multi-stage screening and harvesting device for burrowing shellfish according to claim 1, characterized in that: The frame (2) is provided with ropes (8) at each of the four corners for connecting the rigging line (1).

3. The multi-stage screening and harvesting device for burrowing shellfish according to claim 1, characterized in that: The end of the mesh garment (3) is tied by a binding rope (4), the free end of which is connected to the frame (2).

4. The multi-stage screening and harvesting device for burrowing shellfish according to claim 1, characterized in that: X is 15mm, Y is 18mm, and Z is 21mm.

5. The multi-stage screening and harvesting device for burrowing shellfish according to claim 1, characterized in that: A is 45°, B is 30°, and C is 20°.

6. The multi-stage screening and harvesting device for burrowing shellfish according to claim 1, characterized in that: The tooth projection height is D, and its range is 80mm≤D≤150mm.

7. The multi-stage screening and harvesting device for burrowing shellfish according to claim 6, characterized in that: The value of D is 100 mm.

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