A slow-release device for mariculture bait

Abstract

This invention provides a slow-release feed device for marine aquaculture, relating to the field of marine aquaculture technology. It includes a rotating drum, a drum cover, and a fixed shaft. A rotating impeller is mounted on the rotating drum, which is connected to the drum cover to form a cylindrical space. The fixed shaft passes through the central axis of the rotating drum and drum cover and is rotatably connected to them. A cake holder, a feed cake, and a cake brush are installed within the cylindrical space. The cake holder is fixedly connected to the fixed shaft, and the feed cake is mounted and fixed on the cake holder. The cake brush rotates synchronously with the rotating drum, brushing the surface of the feed cake to accelerate slow release. Utilizing ocean currents or the up-and-down movement of seawater, the rotating impeller drives the rotating drum to rotate, which in turn drives the cake brush to continuously brush the slow-release flocculated layer formed on the surface of the feed cake. This effectively accelerates the diffusion and release of feed particles, solving the problem of excessively long natural slow-release time for feed cakes and their inability to pass through a 150-mesh or finer silk sieve, thus meeting the needs of aquaculture such as oyster farming.

Description

Technical Field

[0001] This invention relates to the field of marine aquaculture technology, and in particular to a slow-release device for marine aquaculture feed. Background Technology

[0002] Currently, marine aquaculture mainly relies on natural algae as a food source, which differs from the artificial feeding method used in artificial pond aquaculture. The marine aquaculture model that relies entirely on natural algae presents significant instability: when natural algae in the sea area dries up or decreases due to seasonal changes, ocean current fluctuations, or other environmental factors, it directly leads to insufficient food intake for farmed organisms (such as oysters and shellfish), making it difficult to meet their normal growth and fattening needs, thus restricting the increase in aquaculture yield and the stability of economic benefits.

[0003] According to the patent CN108112824A, "A method for preparing and applying filter-feeding shellfish feed," its technical solution has fatal flaws for oyster farming: ① The feed relies on a limited screen density: the feed blocks in this solution rely on a silk sieve of less than 80 mesh to filter the feed, resulting in a large particle size that cannot meet the filter-feeding needs of oysters; ② The slow-release period is more than 3 months, causing the feed to rot and deteriorate, completely losing its fattening effect; ③ The particles cannot be suspended and the particle size exceeds the standard: when the feed particles pass through a silk sieve of less than 80 mesh, the particle size is ≥200 micrometers, which is the upper limit of 100 micrometers for filter feed particles, and the particles will sink quickly and cannot be kept in suspension, making it impossible for sessile filter feeders to filter feed.

[0004] To address the aforementioned issues, the applicant has developed a new device specifically designed for marine aquaculture that can accelerate the slow release of the feed cake. Summary of the Invention

[0005] This invention addresses the technical problem of excessively long slow-release time in newly developed bait cakes by providing a slow-release device for marine aquaculture. It features a rotatable drum and drum cover, with a cake holder, bait cake, and cake brush installed inside. The drum is driven to rotate by ocean currents or the up-and-down movement of seawater, which in turn causes the cake brush to continuously agitate the slow-release flocculation layer formed on the surface of the bait cake. This effectively accelerates the diffusion and release of bait particles, solving the problem of excessively long natural slow-release time in newly developed bait cakes and meeting the needs of oyster and other aquaculture and fattening.

[0006] Therefore, the technical solution of the present invention is a slow-release device for marine aquaculture feed, comprising a rotating drum, a rotating drum cover, and a fixed shaft. A rotating impeller is installed on the rotating drum, and the rotating drum and the rotating drum cover are connected to form a cylindrical space. The fixed shaft passes through the central axis of the rotating drum and the rotating drum cover and is rotatably connected to the rotating drum and the rotating drum cover. A cake holder, a feed cake, and a cake brush are installed in the cylindrical space. The cake holder is fixedly connected to the fixed shaft, the feed cake is installed and fixed on the cake holder, and the cake brush rotates synchronously with the rotating drum to brush the surface of the feed cake to accelerate slow release when the rotating drum rotates.

[0007] Furthermore, the rotating drum includes a hollowed-out rotating drum frame and a rotating drum filter screen mounted on the rotating drum frame. The mesh size of the rotating drum filter screen is 150-300 mesh, which is used to filter the slow-released bait particles.

[0008] Furthermore, a rotating impeller is provided on the outer side of the rotating drum frame to drive the rotating drum and the rotating drum cover to rotate around a fixed axis.

[0009] Furthermore, the cake brush includes a handle and bristles, with both ends of the handle fixed inside the rotating drum.

[0010] Furthermore, the pie brush includes a handle and bristles. The handle has handle fixing plates at both ends, which are fixed to the rotating drum. The handle fixing plates also have handle slides. The pie brush can slide up and down along the handle slides.

[0011] Furthermore, a counterweight is provided above the cookie brush to increase the downward pressure of the brush.

[0012] Furthermore, the rotating impellers are arranged in a double-ring configuration, with an odd number of rotating impellers on each ring, and the rotating impellers on the upper and lower rings are spaced apart from each other.

[0013] Furthermore, the rotating drum and the drum cover are rotatably connected to the fixed shaft via a waterproof bearing; a retaining spring is provided on the outside of the waterproof bearing for limiting its position.

[0014] Furthermore, the bottom surface of the rotary drum cover has a hollow structure and is fitted with a drum cover filter screen; the mesh size of the drum cover filter screen is the same as that of the rotary drum filter screen.

[0015] Furthermore, a cake tray sleeve is provided in the middle of the cake tray, and the cake tray sleeve is fitted onto the fixed shaft and fixedly connected to the fixed shaft; a limiting shaft is provided on the side of the cake tray near the bait cake, and a limiting hole corresponding to the limiting shaft is provided on the bait cake, and the bait cake is prevented from rotating by the cooperation of the limiting shaft and the limiting hole.

[0016] The beneficial effects of this invention are as follows: By innovatively utilizing natural ocean currents to drive the rotating impeller and drive the rotating drum to rotate, it can operate without external force, reducing operating costs; the cake brush adopts a fixed or floating design, and when floating, it can automatically move downward as the bait cake is consumed, continuously peeling off the slow-release flocculation layer on the surface of the bait cake, significantly shortening the natural slow-release cycle from more than two months to about 20 days, effectively accelerating the diffusion and release of bait particles, solving the problem of excessively long natural slow-release time of newly developed bait cakes, and meeting the needs of aquaculture such as oysters. At the same time, the release of bait particles (0.05-0.10mm) is controlled by a 150-300 mesh filter, perfectly matching the feeding habits of oysters, greatly improving the utilization rate of bait and reducing bait waste; the key rotating components adopt a waterproof design, ensuring the long-term stable operation of the device in complex seawater environments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 yes Figure 1 A sectional view;

[0019] Figure 3 yes Figure 1 Exploded view;

[0020] Figure 4 This is a schematic diagram of the rotating drum;

[0021] Figure 5 This is a schematic diagram of the rotating drum frame;

[0022] Figure 6 This is a schematic diagram of the rotating cylinder cover;

[0023] Figure 7 This is a schematic diagram of the structure of the biscuit tray;

[0024] Figure 8 This is a schematic diagram of the bait cake structure;

[0025] Figure 9 This is a schematic diagram of the structure of a pancake brush;

[0026] Figure 10 This is a schematic diagram of the structure of another embodiment of the biscuit brush;

[0027] Explanation of symbols in the diagram:

[0028] 1. Rotating drum; 11. Rotating drum frame; 111. Rotating drum shaft hole; 12. Rotating drum filter screen; 13. Rotating impeller; 2. Rotating drum cover; 21. Cover shaft hole; 22. Cover filter screen; 3. Fixed shaft; 31. Waterproof bearing; 32. Snap ring; 4. Cake holder; 41. Cake holder sleeve; 42. Cake limiting shaft; 43. Shaft pin; 5. Bait cake; 51. Cake shaft hole; 52. Cake limiting hole; 6. Cake brush; 61. Brush handle; 611. Brush handle shaft hole; 62. Brush bristles; 63. Brush handle fixing piece; 631. Brush handle slide; 64. Counterweight. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figures 1-9 As shown, the present invention provides a slow-release device for marine aquaculture feed, which includes a rotating cylinder 1, a rotating cylinder cover 2, and a fixed shaft 3. One end of the rotating cylinder 1 is closed, and the other end of the rotating cylinder 1 is fixedly and sealed to the rotating cylinder cover 2. For example, the rotating cylinder 1 and the rotating cylinder cover 2 are fixedly and sealed to each other by a snap or thread. After the rotating cylinder 1 and the rotating cylinder cover 2 are fixedly connected, a closed cylindrical space is formed. The fixed shaft 3 passes through the central axis of the rotating cylinder 1 and the rotating cylinder cover 2 and is rotatably connected to the rotating cylinder 1 and the rotating cylinder cover 2.

[0031] The rotating drum 1 includes a rotating drum frame 11 with one end open and a rotating drum filter 12. The rotating drum frame 11 has a hollow structure, and the rotating drum filter 12 is installed on the rotating drum frame 11. The rotating drum filter 12 is used to filter the slow-release feed particles. The mesh size of the rotating drum filter 12 is 150-300 mesh, and its filtration range is 0.05-0.10 mm. The filtered feed particles are suitable as feed for aquaculture, such as feed suitable for oyster farming.

[0032] A rotating impeller 13 is provided on the outer side of the rotating drum frame 11. The rotating impeller 13 drives the rotating drum 1 and the rotating drum cover 2 to rotate around the fixed shaft 3. The rotating impeller 13 is spiral in shape and can be distributed in single or multiple rings. That is, multiple rotating impellers 13 on the outer side of the rotating drum frame 11 form a ring, or they can form multiple rings distributed vertically. The number of rotating impellers 13 on each ring is odd, for example, three rotating impellers 13 on each ring. As the optimal solution, the rotating impeller 13 of the present invention is distributed in double rings, with three rotating impellers 13 on each ring, and the rotating impellers 13 on the upper and lower rings are distributed alternately. Under the action of ocean currents or the up-and-down movement of seawater, the rotating impeller 13 can drive the rotating drum 1 and the rotating drum cover 2 to rotate around the fixed shaft 3.

[0033] The rotating drum frame 11 has a rotating drum shaft hole 111 in the middle of its closed end, and a drum cover shaft hole 21 is provided in the middle of the bottom surface of the rotating drum cover 2. Waterproof bearings 31 are provided in the rotating drum shaft hole 111 and the drum cover shaft hole 21. The rotating drum 1 and the rotating drum cover 2 are rotatably connected to the fixed shaft 3 through the waterproof bearings 31. The waterproof bearings 31 are ceramic bearings. In order to achieve the limit, a retaining ring 32 is provided on the outside of the waterproof bearings 31.

[0034] The bottom surface of the rotating cover 2 has a hollow structure, and a cover filter 22 is installed on the bottom surface of the rotating cover 2. The mesh size of the cover filter 22 is the same as that of the rotating cover filter 12.

[0035] The slow-release feed device is installed in the aquaculture area of ​​seawater and is suspended from the aquaculture area by a fixed shaft 3 on a rope or raft frame. The open end of the rotating cylinder 1 faces downward, that is, the rotating cylinder cover 2 is located below the rotating cylinder 1. The closed cylindrical space formed by the connection of the rotating cylinder 1 and the rotating cylinder cover 2 contains a cake holder 4, a feed cake 5 and a cake brush 6. The cake holder 4 is fixedly connected to the fixed shaft 3 and is used for the installation and fixation of the feed cake 5. The cake brush 6 is fixedly connected to the rotating cylinder 1 and is used to brush and peel off the slow-release flocculation layer on the surface of the feed cake 5 to accelerate the slow release of the feed cake 5.

[0036] The middle part of the cake tray 4 is provided with a cake tray sleeve 41, which is sleeved on the fixed shaft 3 and fixedly connected to the fixed shaft 3 by a shaft pin 43. The cake tray 4 is provided with a cake limiting shaft 42 on the side near the bait cake 5 for limiting and fixing the bait cake 5.

[0037] The bait cake 5 is a newly developed marine aquaculture bait. Its main components are micron-sized soybean meal and auxiliary materials, which are compressed into a dense cake structure. The bait cake can be slowly released in seawater, with a natural release time of more than 2 months. The bait cake 5 used in this application has a feed cake shaft hole 51 in the middle for the fixed shaft 3 to pass through. The bait cake 5 also has a feed cake limiting hole 51 corresponding to the feed cake limiting shaft 42. The bait cake 5 is fixed on the cake holder 4 by the feed cake limiting shaft 42 and the feed cake limiting hole 51 to prevent the bait cake 5 from rotating.

[0038] The cake brush 6 is installed above the bait cake 5. The cake brush 6 includes a brush handle 61 and brush bristles 62. The brush handle 61 has a brush handle shaft hole 611 in the middle, which is used to pass through the fixed shaft 3. The cake brush 6 is fixed inside the rotating drum 1 by the two ends of the brush handle 61, or the cake brush 6 is fixed inside the rotating drum 1 by the brush handle fixing pieces 63 at both ends of the brush handle 61. When the soft brush bristles 62 rotate with the rotating drum 1, because the brush bristles 62 of the cake brush 6 are relatively long and soft, after the cake brush 6 is fixed, the ends of the brush bristles 62 can extend all the way to the upper surface of the cake holder 4, so that the bait cake 5 can be continuously brushed to accelerate the slow release of the bait cake 5.

[0039] Under current technology, bait cake 5 will slowly release when soaked in seawater, and a slow-release flocculation layer will form on its surface. Without external force, the slow-release flocculation layer diffuses slowly and requires a long release time. By driving the cake brush 6 to rotate through the rotating drum 1, the cake brush 6 continuously brushes the slow-release flocculation layer, which can accelerate the diffusion of the slow-release flocculation layer and accelerate the slow release of bait cake 5. Experiments have shown that this slow-release bait device can shorten the slow release time of bait cake 5 to about 3-20 days.

[0040] like Figure 10 As shown, in one specific embodiment, the difference between this bait slow-release device and the above embodiments is that the brush handle 61 has brush handle fixing plates 63 at both ends, the brush handle fixing plates 63 are fixed on the rotating cylinder 1, and the brush handle fixing plates 63 have brush handle slides 631. The cake brush 6 can slide up and down along the brush handle slides 631. At this time, the cake brush 6 and the bait cake 5 are in a floating state. As the bait cake 5 is slowly released and becomes thinner, the cake brush 6 slides down along the brush handle slides 631, always maintaining a floating connection with the bait cake 5 and always maintaining the same friction. In the above embodiments, the cake brush 6 is fixed, and its friction with the bait cake 5 will decrease as the bait cake 5 is slowly released and becomes thinner.

[0041] To increase the downward pressure of the cake brush 6, a counterweight 64 is provided above the cake brush 6. The counterweight 64 is a detachable structure. By adding different counterweights 64, the friction between the cake brush 6 and the bait cake 5 can be adjusted, thereby adjusting the slow release speed of the bait cake 5 and improving the applicability of the device.

[0042] This invention provides a slow-release feed device for marine aquaculture. It cleverly utilizes natural ocean currents to drive a rotating impeller, which in turn rotates a drum. This drives a cake brush to continuously brush the surface of the feed cake to remove the flocculated layer, significantly solving the problem of slow natural release of newly developed feed cakes. Furthermore, it requires no external power source, reducing aquaculture costs. The device incorporates a specially designed mesh filter to control the particle size of the released feed particles, adapting to the feeding habits of aquatic organisms and reducing waste. Simultaneously, the weighted floating cake brush design allows it to automatically move downwards as feed is consumed, maintaining constant friction and achieving long-term, stable, and efficient slow release. Key rotating components are waterproof, ensuring long-term stable operation of the device in complex marine environments.

[0043] However, the above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A slow-release device for aquaculture feed, characterized in that, The device includes a rotating drum, a rotating drum cover, and a fixed shaft. A rotating impeller is mounted on the rotating drum. The rotating drum and the rotating drum cover are connected to form a cylindrical space. The fixed shaft passes through the central axis of the rotating drum and the rotating drum cover and is rotatably connected to the rotating drum and the rotating drum cover. A cake holder, a bait cake, and a cake brush are installed in the cylindrical space. The cake holder is fixedly connected to the fixed shaft. The bait cake is mounted and fixed on the cake holder. The cake brush rotates synchronously with the rotating drum and is used to brush the surface of the bait cake to accelerate slow release when the rotating drum rotates.

2. The slow-release feed device for marine aquaculture according to claim 1, characterized in that, The rotating drum includes a hollowed-out rotating drum frame and a rotating drum filter screen installed on the rotating drum frame. The rotating drum filter screen has a mesh size of 150-300 mesh and is used to filter the slow-released bait particles.

3. The slow-release feed device for marine aquaculture according to claim 2, characterized in that, A rotating impeller is provided on the outer side of the rotating drum frame to drive the rotating drum and the rotating drum cover to rotate around a fixed axis.

4. The slow-release feed device for marine aquaculture according to claim 3, characterized in that, The cake brush includes a handle and bristles, with both ends of the handle fixed inside the rotating cylinder.

5. The slow-release feed device for marine aquaculture according to claim 3, characterized in that, The disc brush includes a handle and bristles. The handle has handle fixing plates at both ends, which are fixed to the rotating cylinder. The handle fixing plates are provided with handle slides. The disc brush can slide up and down along the handle slides.

6. The slow-release feed device for marine aquaculture according to claim 5, characterized in that, A counterweight is provided above the biscuit brush to increase the downward pressure of the brush.

7. The slow-release feed device for marine aquaculture according to claim 3, characterized in that, The rotating impeller is arranged in a double ring, with an odd number of rotating impellers on each ring, and the rotating impellers on the upper and lower rings are spaced apart from each other.

8. The slow-release feed device for marine aquaculture according to claim 1, characterized in that, The rotating drum and the drum cover are rotatably connected to the fixed shaft via a waterproof bearing; a retaining spring is provided on the outside of the waterproof bearing for limiting its position.

9. The slow-release feed device for marine aquaculture according to claim 2, characterized in that, The bottom surface of the rotating cylinder cover has a hollow structure and is fitted with a cylinder cover filter screen; the mesh size of the cylinder cover filter screen is the same as that of the rotating cylinder filter screen.

10. The slow-release feed device for marine aquaculture according to claim 1, characterized in that, The cake tray has a cake tray sleeve in the middle, which is sleeved on the fixed shaft and fixedly connected to the fixed shaft; the cake tray has a limiting shaft on the side near the bait cake, and the bait cake has a limiting hole corresponding to the limiting shaft. The limiting shaft and the limiting hole cooperate to prevent the bait cake from rotating.

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