Classification screening device for processing quick-frozen lobster tails

Abstract

The invention belongs to the technical field of lobster tail processing, and mainly provides a classified screening device for processing quick-frozen lobster tails. Comprising a rack; the screening bottom plate is arranged on the rack; the fixing frame is arranged on the screening bottom plate; the rotating rollers are distributed at intervals and are rotationally connected to the fixed frame, a plurality of elastic pieces are installed on the rotating rollers, and the elastic pieces are in a spiral shape; and the driving module is installed on the fixing frame, a feeding module is arranged on one side of the rack, and the screening bottom plate is fixedly connected with a discharging pipe. Existing hard spiral blades are replaced with the flexible elastic pieces, when the elastic pieces make contact with the stuck lobster tail, the elastic pieces deform, in the process, the elastic pieces cannot cause hard extrusion on the lobster tail, in this way, the probability that a shell of the lobster tail is damaged is reduced, meanwhile, meat in the lobster tail cannot be damaged, and the lobster tail is prevented from being damaged. The integrity of the lobster tails is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of lobster tail processing, and particularly relates to a grading and screening device for processing frozen lobster tails. Background Art

[0002] With the rapid development of the aquatic product processing industry, as one of the high-value-added aquatic products, the demand for the processing, grading, and screening of lobster tails is increasing day by day. The processing process of frozen lobster tails includes raw material receiving, pretreatment, sorting, quick-freezing, packaging, etc. Among them, grading and screening are important links to ensure product quality and meet market demand.

[0003] Currently, a nine-roller screening machine is mostly used to screen lobster tails. Its principle is to use nine groups of identical roller shafts. By gradually setting the distance between each group of roller shafts and the screening plate from large to small, each group of roller shafts corresponds to a specific size range, and lobster tails of different sizes will fall at different positions, thus achieving the step-by-step sorting of lobsters.

[0004] During the process of the roller shaft driving the lobster tails to move horizontally, if the size of the lobster tails on the roller shaft is close to the distance between the roller shaft and the screening plate, the lobster tails will get stuck between the roller shaft and the screening plate. At the same time, the spiral blades on the roller shaft will hard-extrude the stuck lobster tails, and the outer shells of the lobster tails subjected to hard extrusion will crack, affecting the appearance quality, and also causing the meat inside the lobster tails to deform. Summary of the Invention

[0005] In order to overcome the disadvantages described in the above background art, the present invention provides a grading and screening device for processing frozen lobster tails.

[0006] The technical solution is as follows: A grading and screening device for processing frozen lobster tails, comprising:

[0007] A frame;

[0008] A screening bottom plate, arranged on the frame;

[0009] A fixed frame, arranged on the screening bottom plate;

[0010] Rotating rollers, distributed at intervals, are all rotatably connected to the fixed frame. The distance between all the rotating rollers and the screening bottom plate gradually decreases from top to bottom. A number of elastic members are installed on the rotating rollers, and the elastic members are spiral-shaped;

[0011] A driving module, installed on the fixed frame, for driving all the rotating rollers to rotate. A feeding module is arranged on one side of the frame, and a discharging pipe is fixedly connected to the side of the screening bottom plate away from the feeding module. The discharging pipe is used to collect the screened materials.

[0012] Further, the elastic member is an elastic airbag. The elastic member is fixedly connected and communicated with a connecting pipe, the connecting pipe is communicated with a rotating transition member, and the rotating transition member is rotatably connected to the adjacent rotating roller.

[0013] Further, in the arrangement order of all the rotating rollers from top to bottom, several of the rotating rollers have two of the elastic members, and the remaining rotating rollers have one of the elastic members.

[0014] Further, for the rotating roller having two of the elastic members, the two elastic members thereon are in contact with each other.

[0015] Further, the pitch of all the elastic members gradually decreases from top to bottom.

[0016] Further, it further includes:

[0017] An angle adjustment mechanism, arranged on the frame, for adjusting the angle of the screening bottom plate and controlling the moving speed of the material on the screening bottom plate. The angle adjustment mechanism includes:

[0018] A first driving push rod, fixedly connected to the frame, and a straight rack is fixedly connected to the telescopic end of the first driving push rod;

[0019] A straight gear, fixedly connected to the screening bottom plate, the straight rack meshes with the straight gear, and the frame is rotatably connected to the screening bottom plate.

[0020] Further, arc-shaped grooves are circumferentially and uniformly distributed on the frame, convex columns are circumferentially and uniformly distributed on the screening bottom plate, and the arc-shaped grooves correspond to the convex columns on the screening bottom plate one by one. The convex columns on the screening bottom plate are located in the adjacent arc-shaped grooves and slide.

[0021] Further, the inside of the arc-shaped groove and the outside of the convex column on the screening bottom plate are both set as rough surfaces.

[0022] Further, it further includes:

[0023] A gap adjustment assembly, arranged on the screening bottom plate, for pushing the fixed frame to move, thereby adjusting the distance between all the rotating rollers and the screening bottom plate. The gap adjustment assembly includes:

[0024] A fixed frame, fixedly connected to the side of the screening bottom plate close to the frame, and a second driving push rod is fixedly connected to the fixed frame;

[0025] A support frame, fixedly connected to the fixed frame and fixedly connected to the telescopic end of the second driving push rod. The support frame is slidably connected to the fixed frame.

[0026] Furthermore, a water distribution pipe is installed on the upper side of the fixed frame, and the water distribution pipe is used to spray liquid onto the screening bottom plate.

[0027] Compared with the existing similar technologies, the present invention has at least the following advantages: by replacing the existing rigid spiral blades with flexible elastic members, when the elastic member contacts the stuck lobster tails, the elastic member deforms. During this process, the elastic member will not cause hard extrusion to the lobster tails. In this way, the probability of damage to the outer shell of the lobster tails is reduced, and at the same time, the meat inside the lobster tails will not be damaged, ensuring the integrity of the lobster tails.

[0028] In the present invention, the elastic member is set as an elastic airbag, and the gas in the elastic member at the place where the lobster tails accumulate is pumped out, so as to reduce the blockage of the lobster tails on the rotating roller, facilitate the downward movement of the stacked lobster tails on it, quickly disperse the stacked lobster tails, and further reduce the extrusion force on the lobster tails, improving the screening effect of the lobster tails.

[0029] By limiting the pitch of the elastic members in the present invention, the pitch of all elastic members decreases layer by layer, reducing the accumulation of lobster tails during the initial screening, improving the stability of the subsequent movement of the lobster tails, reducing the damage to the lobster tails, and ensuring the integrity of the lobster tails.

[0030] In the present invention, when the lobster tails accumulate, the screening bottom plate rotates to increase the inclination degree of the rotating roller, strengthening the guiding effect of the rotating roller on the lobster tails thereon and facilitating the movement of the lobster tails on the rotating roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0032] Figure 2 is a three-dimensional structural schematic diagram of another perspective of the present invention;

[0033] Figure 3 is a three-dimensional structural schematic diagram of the fixed frame and the rotating roller of the present invention;

[0034] Figure 4 is a three-dimensional structural schematic diagram of the elastic member and the drive module of the present invention;

[0035] Figure 5 is an exploded three-dimensional structural diagram of the rotating roller and the elastic member of the present invention;

[0036] Figure 6 is a three-dimensional structural schematic diagram of the communication pipe and the rotating transition member of the present invention;

[0037] Figure 7 is a three-dimensional structural schematic diagram of the straight rack and the straight gear of the present invention;

[0038] Figure 8Schematic three-dimensional structure of the fixing frame and the second driving push rod of the present invention;

[0039] Figure 9 Exploded three-dimensional structure diagram of the components at the second driving push rod of the present invention.

[0040] Explanation of reference numerals: 1 - frame, 2 - screening bottom plate, 3 - fixing frame, 4 - rotating roller, 5 - elastic member, 6 - driving module, 7 - feeding module, 8 - discharging pipe, 21 - communicating pipe, 22 - rotating transition member, 31 - first driving push rod, 32 - straight rack, 33 - straight gear, 34 - arc groove, 41 - fixing frame, 42 - second driving push rod, 43 - support frame, 51 - water distribution pipe. Detailed implementation manners

[0041] The present invention will be further described in detail below in conjunction with the drawings and specific implementation manners, but the protection scope and application scope of the present invention are not limited.

[0042] It has been found through research that when using a nine-roller screening machine to screen lobster tails, there will be a situation where lobster tails accumulate on the upper side of the roller shaft. This is mainly due to reasons such as the feeding rate exceeding the sorting ability of the roller shaft, the roller shaft spacing being too small, the grading gradient being unreasonable, or the large morphological differences of lobster tails. After the lobster tails accumulate on the roller shaft, the lobster tails cannot move smoothly, and the spiral blades on the roller shaft will squeeze the lobster tails, thus causing damage to the lobster tails.

[0043] As the screening of lobster tails progresses, the number of lobster tails on the roller shaft gradually decreases from top to bottom, and at the same time, the number on the roller shaft gradually decreases from left to right. Therefore, it is easier for lobster tails to accumulate in the upper and left parts.

[0044] Example 1: A grading and screening device for processing frozen lobster tails. Please refer to Figures 1-6 , including: a frame 1; a screening bottom plate 2, arranged on the frame 1; a fixing frame 3, arranged on the screening bottom plate 2; rotating rollers 4, distributed at intervals and all rotatably connected to the fixing frame 3. The distance between all the rotating rollers 4 and the screening bottom plate 2 gradually decreases from top to bottom. A number of elastic members 5 are installed on the rotating rollers 4, and the elastic members 5 are spiral-shaped; a driving module 6, installed on the fixing frame 3, for driving all the rotating rollers 4 to rotate. A feeding module 7 is arranged on one side of the frame 1, and a discharging pipe 8 is fixedly connected to the side of the screening bottom plate 2 away from the feeding module 7. The discharging pipe 8 is used to collect the screened materials.

[0045] In this solution, it aims to solve the problem that when the existing nine-roller screening machine screens lobster tails, the spiral blades on the roller shafts will squeeze the lobster tails, resulting in the cracking of the lobster tail shells, thus improving the screening effect of lobster tails; there are nine rotating rollers 4, and they are all in an inclined state, facilitating the rightward movement of the lobster tails; the distances between all the rotating rollers 4 and the screening bottom plate 2 respectively represent the sizes of the lobster tails to be screened; the function of the elastic member 5 is the same as that of the spiral blades on the existing roller shafts; the drive module 6 is a conventional structure, including a high-efficiency motor and several belt pulleys and belts. The high-efficiency motor has lower losses and higher efficiency, saving energy; the feeding module 7 is a chain conveyor for transporting lobster tails to the rear side of the screening bottom plate 2 (in contact with the uppermost rotating roller 4); the discharging pipe 8 is a conventional structure, with nine receiving ports provided thereon, and corresponding to the rotating rollers 4 one by one.

[0046] Please refer to Figures 4-6 , the elastic member 5 is an elastic airbag. The elastic member 5 is fixedly connected and communicated with a connecting pipe 21. The connecting pipe 21 is communicated with a rotating transition member 22. The rotating transition member 22 is rotatably connected to the adjacent rotating roller 4. During the rotation of the rotating roller 4, under the action of the rotating transition member 22, the connecting pipe 21 will not get entangled. The rotating transition member 22 is connected to the external air supply system; each elastic member 5 is in an independent state, enabling the control of a single elastic member 5 without affecting the operation of the other elastic members 5; an infrared sensor is installed on the fixed frame 3 for real-time monitoring of the number of lobster tails on all the rotating rollers 4; among all the rotating rollers 4 in the arrangement order from top to bottom, the first three rotating rollers 4 have two elastic members 5. The two elastic members 5 on the same rotating roller 4 are in contact with each other, ensuring the continuity of guiding the lobster tails by the two elastic members 5. The remaining rotating rollers 4 have one elastic member 5; the pitches of all the elastic members 5 gradually decrease from top to bottom. When initially screening the lobster tails, there are more lobster tails on the upper rotating roller 4. At this time, the pitch of the elastic member 5 is larger, reducing the probability of lobster tail accumulation and blockage. The number of lobster tails on the lower rotating roller 4 gradually decreases. At this time, the pitch of the elastic member 5 is smaller, making the transportation of the lobster tails more stable, reducing the damage to the lobster tails, and ensuring the integrity of the lobster tails.

[0047] Working principle: When using this device to screen lobster tails, the operator first turns on the drive module 6, the feeding module 7, and the external air supply system. The external air supply system operates and pumps air into the connecting pipe 21 through all the rotating transition members 22. The gas in the connecting pipe 21 enters the adjacent elastic member 5, and the elastic member 5 expands until the elastic member 5 is fully expanded, and then the external air supply system is turned off.

[0048] After the drive module 6 is started, it drives all the rotating rollers 4 to start rotating. The rotating rollers 4 drive the elastic members 5 thereon to rotate synchronously. At this time, the operator puts the lobster tails into the feeding module 7. The feeding module 7 conveys the lobster tails, causing the lobster tails to move to the upper side of the screening bottom plate 2 and be located on the first rotating roller 4 (from top to bottom). The first rotating roller 4 drives the lobster tails thereon to move to the right through the elastic member 5. During this process, when the size of the lobster tail is smaller than the distance between the first rotating roller 4 and the screening bottom plate 2, the lobster tail falls onto the second rotating roller 4. If the size of the lobster tail is still smaller than the distance between the second rotating roller 4 and the screening bottom plate 2 at this time, the lobster tail continues to move downward until the size of the lobster tail is larger than the distance between a certain rotating roller 4 and the screening bottom plate 2 (for example, the fifth rotating roller 4). The fifth rotating roller 4 drives the lobster tail to move to the right, and the lobster tail moves to the receiving port corresponding to the discharge pipe 8. Continuously put the lobster tails on the feeding module 7 and repeat the above process until all the lobster tails are screened. Then, turn off the feeding module 7 and the drive module 6. During the above process, the operator collects the lobster tails that fall from the discharge pipe 8.

[0049] During the process of the elastic member 5 driving the lobster tail to move to the right, since the elastic member 5 is made of a soft material, when the elastic member 5 contacts the jammed lobster tail, the lobster tail squeezes the elastic member 5, and the elastic member 5 deforms. During this process, the elastic member 5 does not cause a hard squeeze on the lobster tail, thus reducing the probability of damage to the lobster tail shell and also not damaging the meat inside the lobster tail, ensuring the integrity of the lobster tail.

[0050] During the process of the lobster tail moving from top to bottom, the number of lobster tails on all the rotating rollers 4 gradually decreases from top to bottom. At the same time, under the guiding action of the elastic member 5 and the rotating rollers 4, the number of lobster tails on the same rotating roller 4 gradually decreases from left to right. Therefore, it is easier for the lobster tails to accumulate on the left side of the upper rotating rollers 4. When the infrared sensor on the fixed frame 3 detects that the lobster tails accumulate on a certain rotating roller 4, taking the accumulation on the left part of the first rotating roller 4 as an example, when the infrared sensor on the fixed frame 3 detects that the lobster tails accumulate on the left part of the first rotating roller 4, the external air supply system extracts the gas inside the left elastic member 5 on this rotating roller 4. This elastic member 5 gradually contracts from the expanded state, causing the elastic member 5 to lose the guiding effect on the lobster tail. Due to the contraction of the elastic member 5, there is no blockage in the gap between the rotating roller 4 and the screening bottom plate 2, reducing the blockage of the lobster tails on this rotating roller 4 and facilitating the downward movement of the small-sized lobster tails accumulated thereon. At the same time, due to the contraction of the elastic member 5, the extrusion on the lobster tail is further reduced, enabling the large-sized lobster tails at this position to move to the right along the rotating roller 4 by their own gravity.

[0051] During the process of the lobster tails moving to the right in this part, the stacked lobster tails gradually disperse. The large-sized lobster tails continue to move to the right and move onto the right elastic member 5. At this time, the right elastic member 5 continues to guide the lobster tails, accelerating the moving speed of the lobster tails and ensuring the screening efficiency.

[0052] When the infrared sensor on the fixed frame 3 detects that the number of lobster tails on the rotating roller 4 has returned to the normal value, the external air supply system injects air into the left elastic member 5 to restore its expanded state. If there is accumulation in other parts, the above process is repeated.

[0053] Embodiment 2: On the basis of Embodiment 1, please refer to Figure 2 、 Figure 7 and Figure 8 It further includes: an angle adjustment mechanism, which is arranged on the frame 1 and is used to adjust the angle of the screening bottom plate 2 to control the moving speed of the materials on the screening bottom plate 2. The angle adjustment mechanism includes: a first driving push rod 31, which is fixedly connected to the frame 1, and the telescopic end of the first driving push rod 31 is fixedly connected with a straight rack 32; a spur gear 33, which is fixedly connected to the screening bottom plate 2, and the straight rack 32 meshes with the spur gear 33. The frame 1 is rotatably connected to the screening bottom plate 2.

[0054] In the above solution, the first driving push rod 31 is an existing electric push rod and has a self-locking function. By driving the screening bottom plate 2 to rotate, the inclination angle of all the rotating rollers 4 is changed, which is convenient for the lobster tails to move on the rotating rollers 4.

[0055] Please refer to Figure 7 On the frame 1, four arc-shaped grooves 34 are arranged in a circumferentially uniform distribution. The centers of the circles where all the arc-shaped grooves 34 are located are at the same position. The screening bottom plate 2 is provided with four convex columns in a circumferentially uniform distribution, and the arc-shaped grooves 34 correspond to the convex columns on the screening bottom plate 2 one by one. The convex columns on the screening bottom plate 2 are located in the adjacent arc-shaped grooves 34 and slide. Through the guiding of the arc-shaped grooves 34 to the screening bottom plate 2, the rotation of the screening bottom plate 2 is more stable; the inside of the arc-shaped grooves 34 and the outside of the convex columns on the screening bottom plate 2 are both set as rough surfaces. By using the rough surfaces of the arc-shaped grooves 34 and the convex columns on the screening bottom plate 2, the friction force between the two is increased, further preventing the arc-shaped grooves 34 and the screening bottom plate 2 from relatively sliding, and at the same time reducing the force received by the telescopic end of the first driving push rod 31 and extending the service life of the first driving push rod 31.

[0056] Working process: When the infrared sensor on the fixed frame 3 detects that the lobster tails on the rotating roller 4 are piled up, the first driving push rod 31 is started. The telescopic end of the first driving push rod 31 drives the straight rack 32 to move upward, and the straight rack 32 drives the spur gear 33 to rotate clockwise (taking Figure 7Taking the front view perspective as the standard, the spur gear 33 drives the screening bottom plate 2 to rotate. The convex posts on the screening bottom plate 2 rotate along the adjacent arc-shaped grooves 34 until the convex posts of the screening bottom plate 2 move to the limit positions of the adjacent arc-shaped grooves 34, and then the first driving push rod 31 stops working. At this time, the screening bottom plate 2 stops rotating.

[0057] During the rotation of the screening bottom plate 2, the screening bottom plate 2 drives all the parts thereon to rotate synchronously, that is, all the rotating rollers 4 rotate clockwise, increasing the inclination degree of the rotating rollers 4, reducing the resistance of the rotating rollers 4 to the lobster tails, facilitating the movement of the lobster tails at the accumulation place. At the same time, the elastic members 5 at the lobster tail accumulation place are in a contracted state (according to the working principle of Embodiment 1). In this way, the moving speed of the lobster tails at the accumulation place is further increased, thereby accelerating the dispersion speed of the lobster tails and ensuring the efficiency of screening the lobster tails.

[0058] After the lobster tails at the accumulation place are dispersed, the telescopic end of the first driving push rod 31 extends out. The telescopic end of the first driving push rod 31 drives the straight rack 32 to reset. The straight rack 32 drives the screening bottom plate 2 to reset through the spur gear 33, so that the convex posts on the screening bottom plate 2 slide and reset along the adjacent arc-shaped grooves 34, and all the rotating rollers 4 are reset, thereby restoring the device to the initial state of screening the lobster tails.

[0059] Embodiment 3: On the basis of Embodiment 2, please refer to Figures 2-4 、 Figure 8 and Figure 9 and further includes: a gap adjustment assembly, which is arranged on the screening bottom plate 2 and is used to push the fixed frame 3 to move, thereby adjusting the distance between all the rotating rollers 4 and the screening bottom plate 2. The gap adjustment assembly includes: a fixed frame 41, which is fixedly connected to one side of the screening bottom plate 2 close to the frame 1, and the fixed frame 41 is fixedly connected with a second driving push rod 42; a support frame 43, which is fixedly connected to the fixed frame 3 and is fixedly connected to the telescopic end of the second driving push rod 42, and the support frame 43 is slidably connected to the fixed frame 41.

[0060] In the above solution, two vertical grooves are provided on the fixing frame 41, and the support frame 43 slides within the two vertical grooves. The second driving push rod 42 is an electric push rod. Before using this device to screen lobster tails, the operator first adjusts the distance between all the rotating rollers 4 and the screening bottom plate 2 according to the size range of the lobster tails to be screened. Taking the case where the size of the lobster tails is large and the distance between all the rotating rollers 4 and the screening bottom plate 2 needs to be increased as an example, during this process, the operator turns on the second driving push rod 42. The telescopic end of the second driving push rod 42 drives the support frame 43 to move upward. The support frame 43 drives the fixing frame 3 to move upward, and the fixing frame 3 drives all the rotating rollers 4 thereon to move upward synchronously, thereby increasing the distance between all the rotating rollers 4 and the screening bottom plate 2. Until the distance between the two is adjusted to an appropriate value, the operator turns off the second driving push rod 42, and the telescopic end of the second driving push rod 42 stops extending, that is, all the rotating rollers 4 stop moving. In this way, the applicability of this device is increased. At the same time, by adjusting all the rotating rollers 4 synchronously, it is ensured that the moving distances of all the rotating rollers 4 are the same, ensuring the accuracy of the adjustment.

[0061] After the screening of the lobster tails is completed, the operator controls the second driving push rod 42 to move all the rotating rollers 4 downward to return to the initial position.

[0062] Please refer to Figures 1-4 , a water distribution pipe 51 is installed on the upper side of the fixing frame 3. A number of water outlets are provided on the lower side of the water distribution pipe 51. The water distribution pipe 51 is used to spray water onto the screening bottom plate 2. The water distribution pipe 51 is communicated with an external water supply system. When using this device to screen lobster tails, the operator turns on the external water supply system. The external water supply system injects water into the water distribution pipe 51. The water distribution pipe 51 sprays the water onto the screening bottom plate 2 and gradually flows downward. The flowing water increases the lubrication degree of the screening bottom plate 2, facilitating the movement of the lobster tails on the screening bottom plate 2. And during the process of the water flowing downward, it will contact the lobster tails being screened. At this time, the water impacts the lobster tails, improving their own lubrication degree, facilitating their downward movement, and reducing the probability of lobster tails accumulating on the screening bottom plate 2. After the screening of the lobster tails is completed, the operator turns off the external water supply system.

[0063] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention. The purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A grading and screening device for processing quick-frozen lobster tails, characterized in that: Included are: Rack (1); A screening bottom plate (2) is arranged on the frame (1); A fixing frame (3) is arranged on the screening bottom plate (2); The rotating rollers (4) are distributed at intervals and are all rotatably connected to the fixed frame (3). The distance between all the rotating rollers (4) and the screening bottom plate (2) gradually decreases from top to bottom. The rotating rollers (4) are equipped with a plurality of elastic members (5), and the elastic members (5) are spiral-shaped. A driving module (6) is mounted on the fixed frame (3) and is used to drive all the rotating rollers (4) to rotate. A loading module (7) is provided on one side of the frame (1). A discharge pipe (8) is fixedly connected to the side of the screening bottom plate (2) away from the loading module (7). The discharge pipe (8) is used to collect the screened materials.

2. A grading and screening device for processing quick-frozen lobster tails according to claim 1, characterized in that: The elastic member (5) is an elastic airbag, the elastic member (5) is fixedly connected to and communicated with a connecting pipe (21), the connecting pipe (21) is communicated with a rotating transition member (22), and the rotating transition member (22) is rotatably connected to the adjacent rotating roller (4).

3. A grading and screening device for processing quick-frozen lobster tails according to claim 2, characterized in that: In the arrangement order of all the rotating rollers (4) from top to bottom, some of the rotating rollers (4) have two elastic members (5), and the remaining rotating rollers (4) have one elastic member (5).

4. The grading and screening device for quick-frozen lobster tail processing according to claim 3, characterized in that: The rotating roller (4) has two elastic members (5), and the two elastic members (5) thereon are in close contact with each other.

5. The grading and screening device for processing quick-frozen lobster tails according to claim 1, characterized in that: The pitches of all the elastic members (5) decrease step by step from top to bottom.

6. The grading and screening device for quick-frozen lobster tail processing according to claim 1, characterized in that: Also included are: An angle control mechanism is arranged on the frame (1) and is used to adjust the angle of the screening bottom plate (2) and control the speed of material movement on the screening bottom plate (2). The angle control mechanism comprises: a first driving push rod (31) fixedly connected to the frame (1), and a straight rack (32) is fixedly connected to the telescopic end of the first driving push rod (31); The spur gear (33) is fixedly connected to the screening bottom plate (2), the spur rack (32) is meshed with the spur gear (33), and the frame (1) is rotatably connected to the screening bottom plate (2).

7. The grading and screening device for quick-frozen lobster tail processing according to claim 6, characterized in that: The frame (1) is provided with arc grooves (34) evenly distributed in the circumferential direction, and the screening bottom plate (2) is provided with convex columns evenly distributed in the circumferential direction, and the arc grooves (34) correspond to the convex columns of the screening bottom plate (2) one by one, and the convex columns on the screening bottom plate (2) are located in adjacent arc grooves (34) for sliding.

8. The grading and screening device for quick-frozen lobster tail processing according to claim 7, characterized in that: The inside of the arc-shaped groove (34) and the outside of the protruding column on the screening bottom plate (2) are both arranged as rough surfaces.

9. The grading and screening device for quick-frozen lobster tail processing according to claim 1, characterized in that: Also included are: A gap control component is arranged on the screening bottom plate (2) and is used to push the fixed frame (3) to move, thereby adjusting the distance between all the rotating rollers (4) and the screening bottom plate (2). The gap control component comprises: A fixed frame (41) is fixedly connected to a side of the screening bottom plate (2) close to the frame (1), and a second driving push rod (42) is fixedly connected to the fixed frame (41); The support frame (43) is fixedly connected to the fixed frame (3) and to the telescopic end of the second driving push rod (42). The support frame (43) is slidably connected to the fixed frame (41).

10. The grading and screening device for quick-frozen lobster tail processing according to claim 1, characterized in that: A water distribution pipe (51) is installed on the upper side of the fixing frame (3), and the water distribution pipe (51) is used to spray liquid onto the screening bottom plate (2).

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