Fish body posture restraining mechanism for fish bloodletting
By designing a fish posture constraint mechanism, the problem of relying on manual operation in the fish bleeding process was solved, achieving stable constraint of fish posture and automated bleeding, thereby improving production efficiency and fish meat quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG MODERN AGRI EQUIP RES INST
- Filing Date
- 2025-04-27
- Publication Date
- 2026-05-12
AI Technical Summary
In existing technologies, the fish bleeding process relies on manual operation, which is inefficient, labor-intensive, and dangerous. The lack of standardized operating procedures results in poor fish quality and production efficiency.
设计了一种鱼体姿态约束机构，包括V型约束通道、弹簧组和触发限位机构，通过对鱼体的多向支撑和约束，确保鱼体在放血过程中保持稳定的姿态，适应不同规格鱼的外形特性，防止姿态偏转。
This achieves stable constraints on the fish's posture, creating conditions for automated bleeding, improving production efficiency, reducing labor intensity, and enhancing the quality and safety of the fish meat.
Smart Images
Figure CN224219324U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fish product processing machinery technology, and in particular to a fish body posture restraint mechanism for fish bleeding. Background Technology
[0002] my country is a major aquaculture country, with a total aquatic product output reaching 71.1617 million tons in 2023, of which 26.2371 million tons were processed. Manual processing methods can no longer meet the requirements of large-scale production, making high-quality, efficient, and mechanized aquatic product processing essential. Currently, the pre-processing stages of aquatic product processing in my country involve a high degree of manual labor, resulting in overall weak technology and low mechanization. Key processes still rely heavily on manual labor, making it a labor-intensive industry. Therefore, developing key technologies and equipment for aquatic product pre-processing is of significant practical importance.
[0003] Bleeding is a crucial step in fish pre-processing. During fish fillet processing, failure to bleed leaves hemoglobin residue in the muscle tissue, reducing the brightness and darkening the color of the fish meat. Therefore, residual hemoglobin causes discoloration, while bleeding gives the fillets a whiter appearance. Bleeding also reduces fishy odor, improving taste and quality. The typical bleeding process involves making a cut along the lower edge of the gill covers on both sides, opening the throat, and then placing the fish in clean water to swim. This free movement allows blood to flow out more quickly, minimizing blood residue. Taking snakehead (black carp) fillets, a common ingredient in dishes like pickled fish and boiled fish, as an example, bleeding is the first step in snakehead fillet production. Currently, China processes approximately 500,000 tons of finished snakehead fillets, primarily relying on manual bleeding; there is a huge market demand for mechanized bleeding.
[0004] Domestic research on fish processing mainly focuses on stages such as orientation, descaling, deheading, evisceration, and skinning. Currently, there are no reports on fish bleeding technology and equipment. In China, bleeding is entirely done manually with hand-held knives, and the methods rely on worker experience, lacking standardized procedures. This processing method is inefficient, labor-intensive, and inherently dangerous. Therefore, the domestic fish bleeding process is currently in a state of "no usable equipment," and the market needs adaptable and practical equipment. When developing equipment for fish bleeding, it is necessary to constrain and limit the posture of live fish to meet the requirements of the throat-cutting bleeding process. Therefore, it is necessary to develop a fish posture constraint mechanism for fish bleeding. Utility Model Content
[0005] This invention provides a fish posture restraint mechanism for fish bleeding, which prevents the fish's posture from deviating and creates conditions for automated bleeding.
[0006] The present invention adopts the following technical solution:
[0007] A fish posture restraint mechanism for bleeding fish includes a V-shaped restraint channel, a cover plate disposed at the top of the channel, a support base plate disposed below the bottom of the channel, and a plurality of spring groups; through holes are provided on the side plates of the V-shaped restraint channel, one end of the spring is fixedly connected to the support base plate, and the other end passes through the through hole and is fixed to the top flange of the side plates, the top flanges of the side plates extend relative to each other, so that a part of the spring is accommodated in the V-shaped restraint channel;
[0008] Springs are symmetrically arranged on both sides of the V-shaped constraint channel to form spring groups. The distance between the two springs in the spring group is less than the maximum distance between the two sides of the fish body. The spring groups are spaced apart in the direction of passage of the V-shaped constraint channel.
[0009] Furthermore, the cover plate above the channel that fixes the position of the fish head is not sealed, or the cover plate is sealed on the V-shaped constraint channel corresponding to the position of the fish head, with a window left in the cover plate to facilitate the fish knife to pierce the fish head to bleed it.
[0010] As an improvement to the above solution, the fish body posture restraint mechanism for bleeding fish also includes a trigger limiting mechanism, which is set at the front end channel outlet of the V-shaped restraint channel; the trigger limiting mechanism includes a trigger baffle and a limiting plate, the limiting plate is centered and installed on the end face of the trigger baffle, and the trigger baffle is used to trigger the fish-killing knife to pierce the fish head.
[0011] As an improvement to the above solution, the limiting plate includes a limiting bottom plate, two side limiting plates, and an upper limiting plate;
[0012] The bottom of the V-shaped constraint channel, together with the side and upper limit plates, forms an approximate funnel shape, facilitating the restraint of the fish's mouth within the channel and constraining its posture; or...
[0013] A first baffle is provided at the front bottom of the V-shaped constraint channel; the first baffle, together with the side limiting plates and the upper limiting plate, forms an approximate flared mouth, which facilitates the limiting of the fish's mouth in the channel and constrains the fish's posture.
[0014] The rear end of the V-shaped constraint channel is connected to the external frame by a supporting base plate pivot. The supporting base plate can drive the V-shaped constraint channel to rotate around the pivot to control the first baffle or the bottom of the V-shaped constraint channel to approach or move away from the limiting plate.
[0015] Preferably, the included angle between the two side limiting plates is 40 degrees, and / or the angle between the upper limiting plate and the limiting base plate is 120 degrees.
[0016] Preferably, the two side plates of the V-shaped constraint channel are bent plates, and the bent plates connecting the flanges are vertically arranged.
[0017] Preferably, the through hole is an elongated through hole, extending in length towards the top flanges of both side plates.
[0018] As an improvement to the above scheme, the spacing between several spring groups at the front end of the V-shaped constraint channel is smaller than the spacing between the remaining spring groups.
[0019] Preferably, the spacing between the spring groups corresponding to the front end of the V-shaped constraint channel is 40mm, and / or the spacing between the remaining spring groups is 50mm.
[0020] Preferably, the included angle between the two side plates of the V-shaped constraint channel is 90 degrees.
[0021] Beneficial effects
[0022] 1) This utility model uses two side plates of a channel with a cross-sectional shape that is approximately V-shaped to adapt to the shape characteristics of fish heads of different sizes, and to limit and constrain the sides of the fish body; the V-shaped bottom of the channel and the cover plate limit and constrain the back and abdomen of the fish, preventing the fish's posture from deviating and creating conditions for bleeding.
[0023] 2) This utility model uses a V-shaped constraint channel and symmetrical springs on both sides to form an adaptive constraint effect on the side of the fish. The width of the head, body and tail of the fish is different, and the width of fish of different sizes is also different. The springs automatically open to both sides according to different thicknesses to ensure that appropriate support force is applied to the side of the fish.
[0024] 3) The multiple rings of the spring are arranged longitudinally to contact the fish skin, and the near-serrated structure clamps the fish body, further preventing the fish from deflecting in the channel.
[0025] 4) The fish posture constraint mechanism and the limit trigger mechanism form a three-dimensional envelope space for the fish body, realizing multi-directional support and constraint of the fish posture. This ensures that the fish maintains a belly-up, head-forward posture throughout the feeding, bleeding, and expulsion processes. The fish posture constraint mechanism completes the fish body constraint, creating conditions for the bleeding action. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of a fish posture restraint mechanism for fish bleeding provided in an embodiment of the present invention;
[0027] Figure 2 yes Figure 1 A schematic diagram of the front view or main view structure;
[0028] Figure 3 Another embodiment of this utility model provides a schematic diagram of the triggering and limiting mechanism of a fish body posture constraint mechanism for fish bleeding;
[0029] Figure 4This is a schematic diagram of the dynamic working relative position between a fish posture constraint mechanism and a trigger limit mechanism for fish bleeding, provided in another embodiment of this utility model;
[0030] Figure 5 This is a schematic diagram of the overall assembly of a fish posture restraint mechanism and frame for fish bleeding, provided by another embodiment of this utility model. Detailed Implementation
[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0032] See Figure 1-2 This is a schematic diagram of a fish posture restraint mechanism for bleeding fish provided by this utility model. The fish posture restraint mechanism 1 includes a V-shaped restraint channel 11, a cover plate 13 disposed at the top of the channel, a support base plate 14 disposed below the bottom of the channel, and several springs 15.
[0033] The V-shaped constraint channel (hereinafter referred to as the channel) has through holes 111 on both side plates. One end of the spring is fixedly connected to the support base plate, and the other end passes through the through hole and is hooked onto the hanging hole provided on the top flange 112 of the side plates. The top flanges of the side plates extend relative to each other, so that part of the spring is accommodated in the channel. Springs are symmetrically arranged on both side plates of the V-shaped constraint channel to form spring groups. The distance between the two springs in the spring group is less than the maximum distance between the two sides of the fish body. The two springs are used to clamp the two sides of the fish body. The spring groups are spaced apart in the direction of passage of the V-shaped constraint channel. There are a total of 26 springs, with 13 springs distributed on each side plate. The springs are in a certain tension state. From the side view of the posture constraint mechanism, the five spring groups at the front end are evenly arranged with a spacing of 40mm to achieve tighter support for the fish head and provide more stable posture support for inserting the bleeding knife into the fish throat. The spacing of the spring groups at the rear end is set to 50mm.
[0034] Based on the physiological characteristics of the outer contour of spindle-shaped fish such as snakehead and grass carp, the spring groups arranged in the channel clamp the two sides of the fish body. The spring groups open to different degrees to adapt to the different positions of the fish body tail, body and head, so as to ensure that appropriate support force is applied to the side of the fish body. At the same time, the multiple rings of the springs are arranged longitudinally to contact the fish skin, and the near-serrated structure clamps the fish body, further preventing the fish posture from deflecting in the channel.
[0035] Preferably, the V-shaped constraint channel includes two side plates 16 with an approximately V-shaped cross-section, and a narrow bottom plate 12 connecting the two side plates. The included angle between the two side plates of the channel is 90 degrees.
[0036] To better fit the fish's body, the V-shaped side panels of the channel are bent plates, and the bent plates connecting the flanges are set vertically.
[0037] The cover plate is fixedly connected to the flanges of the two side plates of the channel by screws and nuts. The cover plate is not closed above the channel where the fish head is located. Optionally, the cover plate has a window at the fish head position of the channel, so that the fish-killing knife 17 can fall down to pierce the fish head and bleed it.
[0038] The through holes on both side plates are elongated through holes 111', extending towards the top flanges of both side plates. The maximum width on both sides of the fish body allows the two springs of the spring assembly to open and exit through the elongated through holes.
[0039] The fish posture restraint mechanism is tilted on the frame 2. A tool holder mechanism is set above the front end of the fish posture restraint mechanism. The rear end of the fish posture restraint mechanism is fixed to the frame by a support base plate through a hinge 4.
[0040] At the front end of the V-shaped constraint channel, a narrow bottom plate 12 extends to provide a first baffle 18, with the end of the first baffle rising upwards.
[0041] See Figure 3 A trigger limiting mechanism 50 is installed at the front end of the V-shaped constraint channel, which includes a trigger baffle 51 and a limiting plate. The limiting plate is centered on the end face of the trigger baffle. The limiting plate is made of 304 stainless steel sheet and mainly includes a limiting base plate 521, two side limiting plates 522, and an upper limiting plate 523. The included angle between the two side limiting plates is 40 degrees, and the angle between the upper limiting plate and the limiting base plate is 120 degrees. The narrow base plate 12 of the V-shaped constraint channel, together with the two side limiting plates and the upper limiting plate, forms an approximate flared mouth, which facilitates the limiting of the fish's mouth in the channel and constrains the fish's posture. In this embodiment, the first baffle 18 is used to guide the fish exiting the channel.
[0042] Alternatively, in another embodiment, the first baffle 18, together with the two side limiting plates 522 and the upper limiting plate 523, forms an approximate flared mouth, which helps to limit the fish's mouth in the channel and force the fish body to stop sliding out of the channel.
[0043] See Figure 5 A cam mechanism driven by a motor (not shown) is disposed below the support base plate 14. The cam mechanism includes a connecting rod 61 and a roller 62 at the end of the connecting rod, the roller contacting the bottom of the support. See also Figure 4 The linkage rotation control of the V-shaped constraint channel front end follows the support base plate to rotate around the hinge shaft, realizing the vertical position change of the V-shaped constraint channel front end. This causes the first stop of the channel to approach the limit plate to form the limit mechanism of the fish mouth, and to move away from the limit plate to unlock the limit mechanism of the fish mouth, allowing the fish body to continue sliding out of the channel.
[0044] Working Process: The fish's back is narrower on both sides, with a narrow bottom plate fitting snugly against the channel. The fish is fed into the V-shaped constraint channel from the rear feeding inlet with its head facing forward and belly facing upward. Using its own weight, the fish slides down the inclined V-shaped constraint channel. Springs on both sides of the fish provide support, allowing it to maintain its feeding posture and prevent it from flipping over during the descent. When the fish reaches the front end of the channel, its mouth contacts and triggers the limiting mechanism. Supported and constrained in four directions by the limiting plate and the first baffle of the channel, the fish stops sliding, its position and posture restricted, awaiting the bleeding action.
[0045] When the trigger baffle is struck by the fish's mouth again, the mechanical linkage mechanism connected to the trigger baffle drives the fish-killing knife to pierce the fish's head from above into the channel. Optionally, the trigger baffle touches the electronic sensor, activating the motor and thus driving the fish-killing knife 17 of the knife holder mechanism to pierce the fish's head from above into the channel.
[0046] When the fish-killing knife is raised and returned to its original position, it touches an electronic sensor, such as a limit switch, which activates the motor to drive the cam mechanism. This causes the V-shaped constraint channel to rotate around the hinge shaft, changing the fish-killing and bleeding state to the fish-exiting state. After the fish is expelled, the motor reverses and the V-shaped constraint channel returns to its initial state, ready to wait for the next fish to be fed into the channel.
[0047] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.
Claims
1. A fish posture restraint mechanism for fish bleeding, characterized in that, It includes a V-shaped constraint channel, a cover plate at the top of the channel, a support base plate at the bottom of the channel, and several spring groups; through holes are provided on the two side plates of the V-shaped constraint channel, one end of the spring is fixedly connected to the support base plate, and the other end passes through the through hole and is fixed to the top flange of the two side plates. The top flanges of the two side plates extend relative to each other, so that a part of the spring is accommodated in the V-shaped constraint channel; Springs are symmetrically arranged on both sides of the V-shaped constraint channel to form spring groups. The distance between the two springs in the spring group is less than the maximum distance between the two sides of the fish body. The spring groups are spaced apart in the direction of passage of the V-shaped constraint channel.
2. The fish posture restraint mechanism for fish bleeding as described in claim 1, characterized in that, Above the channel where the fish head is positioned, the cover is not sealed, or the V-shaped constraint channel corresponding to the fish head position is covered with a cover, with a window left in the cover to facilitate the insertion of a fish-killing knife into the fish head to bleed it.
3. The fish posture restraint mechanism for fish bleeding as described in claim 1, characterized in that, It also includes a trigger limiting mechanism, which is set at the front channel outlet of the V-shaped constraint channel; the trigger limiting mechanism includes a trigger baffle and a limiting plate, the limiting plate is centered and installed on the end face of the trigger baffle, and the trigger baffle is used to trigger the fish-killing knife to pierce the fish head.
4. The fish posture restraint mechanism for fish bleeding as described in claim 3, characterized in that, The limiting plate includes a limiting base plate, two side limiting plates, and an upper limiting plate; The bottom of the V-shaped constraint channel, together with the side and upper limit plates, forms an approximate funnel shape, facilitating the restraint of the fish's mouth within the channel and constraining its posture; or... A first baffle is provided at the front bottom of the V-shaped constraint channel; the first baffle, together with the side limiting plates and the upper limiting plate, forms an approximate flared mouth, which facilitates the limiting of the fish's mouth in the channel and constrains the fish's posture. The rear end of the V-shaped constraint channel is connected to the external frame by a supporting base plate pivot. The supporting base plate can drive the V-shaped constraint channel to rotate around the pivot to control the first baffle or the bottom of the V-shaped constraint channel to approach or move away from the limiting plate.
5. The fish posture restraint mechanism for fish bleeding as described in claim 4, characterized in that, The included angle between the two side limiting plates is 40 degrees, and / or the angle between the upper limiting plate and the limiting base plate is 120 degrees.
6. The fish posture restraint mechanism for fish bleeding as described in claim 1, characterized in that, The two side plates of the V-shaped constraint channel are bent plates, and the bent plates connecting the flanges are set vertically.
7. The fish posture restraint mechanism for fish bleeding as described in claim 1 or 6, characterized in that, The through hole is a long through hole, extending along the top flanges of both side plates.
8. The fish posture restraint mechanism for fish bleeding as described in claim 1, characterized in that, The spacing between the spring groups at the front end of the V-shaped constraint channel is smaller than the spacing between the remaining spring groups.
9. The fish posture restraint mechanism for fish bleeding as described in claim 8, characterized in that, The spacing between the spring groups corresponding to the front end of the V-shaped constraint channel is 40mm, and / or the spacing between the remaining spring groups is 50mm.
10. The fish posture restraint mechanism for fish bleeding as described in claim 1, characterized in that, The included angle between the two side plates of the V-shaped constraint channel is 90 degrees.