A device and method for locating and removing the pectoral fins of the spotted catfish.

Abstract

This invention relates to a device and method for locating and removing the pectoral fins of a spotted catfish. The device comprises a fish-carrying assembly, a fin-locating assembly, and a cutting assembly. The positioning of the fish during pectoral fin preparation and removal is achieved through mouth positioning, a nitrogen spring in the head direction, and the thrust of brush rollers acting on the pectoral fins. After fin removal, the thrust of the brush rollers on the fish ceases, and the fish-carrying assembly resets. During the movement of the electric cylinder, the processing status is determined based on data changes from a pressure sensor, and the distance and rotation speed of the two brush rollers are adjusted in real time to achieve brush roller motion control. In terms of fish positioning and motion control, the pectoral fin preparation, fish feeding, and fin removal processing of objects of different sizes can be achieved solely through the cooperation of the electric cylinder and a synchronous belt drive mechanism. During the pectoral fin preparation stage, the distance between the two brush rollers is minimized to facilitate fin separation; during the fin removal stage, the distance between the two brush rollers is maximized, ensuring that the positions of the two brush rollers and the rotary cutter are staggered, preventing the rotary cutter from interfering with the brush rollers.

Description

Technical Field

[0001] This invention relates to the field of fish processing technology, specifically to a device and method for locating and removing the pectoral fins of the spotted catfish. Background Technology

[0002] Currently, there is no publicly available equipment for removing the pectoral fins of the spotted catfish.

[0003] The spotted catfish has a unique body shape, with its head flattened horizontally and its tail flattened vertically, making it difficult to effectively hold the fish in place using conventional fish-holding mechanisms. During mass production, due to variations in fish size, it's also difficult to pinpoint the location of the pectoral fins based on the distance from the pectoral fin to the mouth. Furthermore, the pectoral fins may initially be pressed against the fish's body or open at an angle, making automatic positioning with fixed clamps difficult. These multiple positioning actions are cumbersome and lack coordination, hindering processing efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for locating and removing the pectoral fins of the spotted catfish, in order to solve the problems existing in the prior art.

[0005] The objective of this invention is achieved as follows: a device for locating and removing the pectoral fins of a spotted catfish, comprising a fish-carrying assembly, a fin-locating assembly, and a cutting assembly;

[0006] The fish-carrying assembly includes: a fixed support frame with a front limiting plate fixed to its front end; a fish body positioning frame for supporting and positioning the spotted catfish, the fish body positioning frame being movably connected to the support frame; and a spring assembly, the front end of the fish body positioning frame being connected to the front limiting plate via the spring assembly.

[0007] The fin positioning assembly includes: an electric cylinder; an electric cylinder connector fixedly connected to the telescopic rod of the electric cylinder; and a pectoral fin positioning component installed on the electric cylinder connector. During operation, the pectoral fin positioning component positions the pectoral fin of the spotted catfish and pushes the pectoral fin of the spotted catfish to the position of the cutting component for the operation of removing the pectoral fin. After the pectoral fin is removed, the fish body positioning frame is driven by the spring component to return to its original position.

[0008] Furthermore, the fish positioning frame includes: a fish body support plate, which extends forward and backward into a strip-shaped flat plate for supporting the spotted catfish; a front convex plate, which protrudes upward from the front end of the fish body support plate to define the position of the fish head, and the spring assembly is connected to the front convex plate; and a tongue-shaped cantilever, which is fixedly connected to the side of the front convex plate facing the fish body and extends horizontally backward for inserting into the fish mouth to position the fish body.

[0009] Furthermore, the spring assembly includes a nitrogen spring and a pressure sensor. One end of the nitrogen spring is connected to the front protrusion plate, and the other end of the nitrogen spring is connected to the front limit plate through the pressure sensor.

[0010] Furthermore, the pectoral fin positioning component includes:

[0011] A synchronous belt drive mechanism includes a main body, a synchronous belt servo driver, a synchronous belt, a driving pulley, and a driven pulley. The main body is fixedly connected to an electric cylinder connecting seat. The driving pulley and the driven pulley of the synchronous belt drive mechanism are rotatably connected to the main body. The output end of the synchronous belt servo driver is connected to the driving pulley to drive the driving pulley, the driven pulley, and the synchronous belt to move.

[0012] The first and second positioning units are relatively movable. The first and second positioning units are respectively provided with a first synchronous belt slider and a second synchronous belt slider. The first and second synchronous belt sliders are respectively connected to the two opposite sides of the synchronous belt. The first and second synchronous belt sliders slide relative to the main body. The first and second synchronous belt sliders are respectively fixedly installed with a first synchronous belt connecting plate and a second synchronous belt connecting plate.

[0013] The first and second synchronous belt connecting plates are each equipped with a brush roller motor. Each brush roller motor has a brush roller that flexibly contacts the fish body at its output end. The two brush rollers are arranged at the same height. The distance between the two brush rollers can be adjusted under the drive of the synchronous belt drive mechanism. When working, the two brush rollers move forward and abut against the two pectoral fins of the spotted catfish.

[0014] Furthermore, the cutter assembly includes:

[0015] Fixed cutter support;

[0016] A geared motor is fixedly connected to the cutter support and equipped with a cutter spindle. The output end of the geared motor is coaxially fixed to the cutter spindle via a coupling.

[0017] A pair of spaced-apart bearing housings, through which the tool spindle of the geared motor passes and serves as a rotational support;

[0018] Two rotary cutters for removing the pectoral fins of the spotted catfish, the rotary cutters having a fixedly mounted cutter spindle with a reduction motor, the two rotary cutters being positioned directly opposite the two pectoral fins of the spotted catfish.

[0019] Furthermore, tail limiting baffles are fixed on both the left and right sides of the tail of the fish body support plate, so that the tail of the spotted catfish is positioned between the two tail limiting baffles when the fish body is positioned; at least two sliders are fixed at the bottom of the fish body support plate, and a guide rail is fixed on the support frame, and the sliders slide back and forth with the guide rail.

[0020] Furthermore, the compressible stroke of the nitrogen spring is greater than 100mm, and the initial force of the nitrogen spring sensed by the pressure sensor is defined as F1, and the final force is defined as F2, where F2≈1.5F1;

[0021] The distance W between the two brush rollers is controlled by the synchronous belt drive mechanism according to the current output value F of the pressure sensor, satisfying W=21.5*F / F1+12.5mm.

[0022] Furthermore, the rotational speed N of the brush roller is controlled by the frequency converter of the brush roller motor according to the current output value F of the pressure sensor, satisfying N=205-39F / F1 revolutions / minute.

[0023] Furthermore, the rotary cutter is a three-blade blade, with a rotation speed greater than 2000 rpm and a maximum outer diameter greater than 350 mm. The rotary cutter rotates in multiples of 120°, and the highest point of the rotary cutter when it stops is lower than the bottom surface of the fish support plate.

[0024] In another aspect of the present invention, a method for locating and removing the pectoral fin of the spotted catfish is proposed, comprising the following steps:

[0025] S1. Place the spotted catfish on the fish body tray, align the tongue-shaped cantilever with the fish's mouth and insert it into the fish's mouth to fix the spotted catfish's position;

[0026] S2. The device is started. The electric cylinder drives the brush roller to move from the tail side of the fish towards the pectoral fin. During this process, the distance between the two brush rollers is the smallest. The brush rollers position the pectoral fin of the spotted catfish and push the spotted catfish towards the head.

[0027] S3. As the fish support plate moves forward, the nitrogen spring is compressed. The PLC control system controls the synchronous belt servo driver and brush roller motor according to the real-time output value of the pressure sensor, and dynamically adjusts the spacing and speed of the brush roller.

[0028] S4. When the fish moves to the designated position and both pectoral fins are directly above the rotary cutter, the distance between the two brush rollers is at its maximum, causing the positions of the two brush rollers and the rotary cutter to be staggered. The reduction motor starts the two rotary cutters to cut off the left and right fins, causing the fin positioning component to separate from the spotted catfish. The fish support plate is relieved of force, and then driven by the elastic restoring force of the nitrogen spring, the fish support plate, carrying the spotted catfish, returns to its original position. Under the control of the PLC electronic control system, the electric cylinder drives the brush rollers to return to their original position.

[0029] The beneficial effects of this invention are as follows:

[0030] 1. It solves the problem of positioning and transporting the special body shape of the spotted catfish. By positioning the fish mouth, using a nitrogen spring near the head, and using a brush roller for fin sorting and positioning, it can effectively position the body and fins of catfish of different sizes, while also facilitating fin cutting.

[0031] 2. The pressure sensor determines and identifies the fish's position in real time, and the PLC electronic control system adjusts the distance and speed of the two brush rollers to achieve the control of the distance between the two brush rollers from small to large, ensuring the reasonable position and movement effect of the brush rollers when finning, pushing fish and cutting fins.

[0032] 3. Traditional cutting tools are easily caught by the serrated structure of the fin edge when cutting fins, resulting in bone residue or tool damage. To solve this problem, this invention uses a fast-rotating multi-blade cutter, with the rotary cutter set as a three-blade blade to reduce the force on the continuous cutting surface. At the same time, the alternating cutting of the blades of the rotary cutter generates a certain impact, improving the cutting quality and avoiding the influence of changes in the meshing position of the fin skeleton during the cutting process. The height of the rotary cutter when stationary is lower than the maximum rotation radius, so it does not prevent the fin from reaching the designated position. Attached Figure Description

[0033] Figure 1 This is the assembly drawing of the present invention.

[0034] Figure 2 This is a schematic diagram of the fish-carrying assembly.

[0035] Figure 3 This is a schematic diagram of the fin positioning component.

[0036] Figure 4 This is a schematic diagram of the cutter assembly.

[0037] Figure 5 This is a schematic diagram of the brush roller structure.

[0038] Figure 6 This is a diagram illustrating the state of fish during production.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1-Fish-carrying assembly; 101-Fish body support plate; 102-Tail limiting baffle; 103-Tongue-shaped cantilever; 104-Front protruding plate; 105-Slider; 106-Guide rail; 107-Support frame; 108-Nitrogen spring; 109-Pressure sensor; 110-Front limiting plate;

[0041] 2-Fish fin positioning assembly; 201-Electric cylinder; 202-Electric cylinder connector; 203-Synchronous belt servo driver; 204-First synchronous belt slider; 205-First synchronous belt connecting plate; 206-Second synchronous belt slider; 207-Second synchronous belt connecting plate; 208-Brush roller; 209-Brush roller motor;

[0042] 3-Cutter assembly; 301-Gear motor; 302-Coupling; 303-Cutter spindle; 304-Various cutter; 305-Bearing housing; 306-Cutter support;

[0043] 4-Frame; 5-PLC electrical control system; 6-Spotted catfish. Detailed Implementation

[0044] The following will refer to the appendices in the embodiments of the present invention. Figure 1-6 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. 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. In this embodiment, the direction of movement of the fish body towards the excision site is defined as forward.

[0045] like Figure 1 As shown, a device for locating and removing the pectoral fins of the spotted catfish is proposed, including a fish-carrying component 1, a fin-locating component 2, a cutting component 3, a frame 4, and a PLC electronic control system 5. The fish-carrying component 1, the fin-locating component 2, and the cutting component 3 are all mounted on the frame 4, and the PLC electronic control system 5 is also mounted on the frame 4.

[0046] like Figure 2 As shown, the fish-carrying component 1 includes:

[0047] A support frame 107 is fixed on the frame 4, and a front limit plate 110 is fixed at the front end of the support frame 107;

[0048] A fish body positioning frame for supporting and positioning the spotted catfish 6, the fish body positioning frame being movably connected to the support frame 107 at the front and rear;

[0049] The front end of the fish body positioning frame is connected to the front limit plate 110 via the spring assembly.

[0050] The aforementioned fish positioning frame includes:

[0051] Fish body support plate 101, which extends front and back into strip-shaped flat plates to support the spotted catfish 6;

[0052] A front protrusion plate 104 protrudes upward from the front end of the fish body support plate 101 to define the position of the fish head, and a spring assembly is connected to the front protrusion plate 104.

[0053] The tongue-shaped cantilever 103 is fixedly connected to the fish-facing side of the front protrusion 104 and extends horizontally backward for insertion into the fish mouth to position the fish body.

[0054] Additionally, the aforementioned spring assembly includes a nitrogen spring 108 and a pressure sensor 109. One end of the nitrogen spring 108 is connected to the front protrusion plate 104, and the other end of the nitrogen spring 108 is connected to the front limit plate 110 via the pressure sensor 109. When the fish support plate 101 moves forward, causing the nitrogen spring to be compressed, pressure data can be output.

[0055] like Figure 3 As shown, the above-mentioned fin positioning component 2 includes:

[0056] The electric cylinder 201 is fixed on the frame 4, and the travel stroke of the electric cylinder 201 is greater than 300mm;

[0057] Electric cylinder connecting seat 202 is fixedly connected to the telescopic rod of electric cylinder 201;

[0058] Pectoral fin positioning component installed on electric cylinder connector 202;

[0059] During operation, the pectoral fin positioning component positions the pectoral fin of the spotted catfish 6 and pushes the pectoral fin of the spotted catfish 6 to the position of the cutting component 3 to perform the operation of removing the pectoral fin. After the pectoral fin is removed, the fish body positioning frame is driven by the spring component to return to its original position.

[0060] The aforementioned pectoral fin positioning components include:

[0061] The synchronous belt drive mechanism includes a main body, a synchronous belt servo driver 203, a synchronous belt, a driving pulley, and a driven pulley. The main body is fixedly connected to an electric cylinder connecting seat 202. The driving pulley and the driven pulley of the synchronous belt drive mechanism are rotatably connected in the main body. The output end of the synchronous belt servo driver 203 is connected to the driving pulley to drive the driving pulley, the driven pulley, and the synchronous belt to move.

[0062] The first positioning unit and the second positioning unit move relative to each other from left to right. The first positioning unit and the second positioning unit are respectively equipped with a first synchronous belt slider 204 and a second synchronous belt slider 206. The first synchronous belt slider 204 and the second synchronous belt slider 206 are respectively connected to the two opposite sides of the synchronous belt, so that the first synchronous belt slider 204 and the second synchronous belt slider 206 can form relative movement. The first synchronous belt slider 204 and the second synchronous belt slider 206 slide relative to the main body. The first synchronous belt slider 204 and the second synchronous belt slider 206 are respectively fixedly installed with a first synchronous belt connecting plate 205 and a second synchronous belt connecting plate 207.

[0063] The first synchronous belt connecting plate 205 and the second synchronous belt connecting plate 207 are both equipped with brush roller motors 209. Each brush roller motor 209 has a brush roller 208 that flexibly contacts the fish body at its output end. The two brush rollers 208 are arranged at the same height. The distance between the two brush rollers 208 can be adjusted under the drive of the synchronous belt drive mechanism. When working, the two brush rollers 208 respectively move forward against the two pectoral fins of the spotted catfish 6.

[0064] like Figure 4 As shown, the above-mentioned cutter assembly 3 includes:

[0065] Cutting part support 306 fixed on frame 4;

[0066] The geared motor 301 is fixedly connected to the cutter support 306 and is equipped with a cutter spindle 303. The output end of the geared motor 301 is coaxially fixed to the cutter spindle 303 through a coupling 302.

[0067] A pair of spaced-apart bearing seats 305 are mounted on the cutter support 306. The cutter spindle 303 of the geared motor 301 passes through the bearing seats 305 and uses the bearing seats 305 as a rotational support.

[0068] Two rotary cutters 304 are used to remove the pectoral fins of the spotted catfish 6. The rotary cutters 304 are fixedly mounted on the cutter spindle 303 of the geared motor 301. The two rotary cutters 304 are respectively positioned opposite the two pectoral fins of the spotted catfish 6.

[0069] As one of the preferred solutions, such as Figure 2 As shown, tail limiting baffles 102 are fixed on both the left and right sides of the tail of the fish body support plate 101. When positioning the fish body, the tail of the spotted catfish 6 is between the two tail limiting baffles 102. Two sliders 105 are fixed at the bottom of the fish body support plate 101. A guide rail 106 is fixed on the support frame 107. The sliders 105 and the guide rail 106 slide back and forth to guide the fish body support plate 101 and the spotted catfish 6 to move forward to the cutting position.

[0070] The relevant parameter settings for the device are as follows:

[0071] like Figure 2 As shown, the gap between the tongue-shaped cantilever 103 and the fish body support plate 101 is 12mm, and the gap between the two tail limiting baffles 102 is 30mm.

[0072] The compressible stroke of the nitrogen spring 108 is greater than 100 mm. The initial force of the nitrogen spring 108 sensed by the pressure sensor 109 is defined as F1, and the final force is defined as F2, where F2≈1.5F1.

[0073] like Figure 3As shown, the distance W between the two brush rollers 208 is controlled by the synchronous belt drive mechanism according to the current output value F of the pressure sensor 109, and satisfies W=21.5*F / F1+12.5mm.

[0074] The rotational speed N of the brush roller 208 is determined by the current output value F of the pressure sensor 109 and controlled by the frequency converter of the brush roller motor 209, satisfying N = 205 - 39F / F1 revolutions per minute. Figure 5 As shown, the brush roller 208 is made of PA610 high-resilience nylon substrate with a 35% silicon carbide coating on the surface, a bristle diameter of 0.4mm, and a bristle extension length of 25mm.

[0075] like Figure 4 As shown, the rotary cutter 304 is a three-blade blade. When the rotary cutter 304 rotates, the rotation speed is greater than 2000 rpm, the maximum outer diameter is greater than 350 mm, the rotary cutter 304 rotates in multiples of 120°, and the highest point of the rotary cutter 304 when it stops is lower than the bottom surface of the fish support plate 101.

[0076] Based on the aforementioned device for locating and removing the pectoral fins of the spotted catfish, a method for locating and removing the pectoral fins of the spotted catfish is proposed, combined with... Figure 1-6 As shown, the method includes the following steps:

[0077] S1. Place the spotted catfish 6 on the fish body tray 101, align the tongue-shaped cantilever 103 with the fish mouth and insert it into the fish mouth to fix the position of the spotted catfish 6.

[0078] S2. The device is started. The electric cylinder 201 drives the brush roller 208 to move from the tail side of the fish towards the pectoral fin. During this process, the brush roller 208 positions the pectoral fin of the spotted catfish 6 and pushes the spotted catfish 6 towards the head.

[0079] S3. As the fish body support plate 101 moves forward, the nitrogen spring 108 is compressed. The PLC control system 5 controls the synchronous belt servo driver 203 and the brush roller motor 209 according to the real-time output value of the pressure sensor 109, and dynamically adjusts the spacing and speed of the brush roller 208.

[0080] S4. When the fish moves to the designated position and both pectoral fins are directly above the rotary cutter 304, the reduction motor 301 starts the two rotary cutters 304 to cut off the left and right fins, so that the fin positioning component 2 is separated from the spotted catfish 6, the fish body support plate 101 is relieved of force, and then driven by the elastic restoring force of the nitrogen spring 108, the fish body support plate 101 moves backward with the spotted catfish 6. Under the control of the PLC electronic control system 5, the electric cylinder 201 drives the brush roller 208 to move backward.

[0081] Based on the above description of the apparatus and method, the key technical points and supplementary explanations are as follows:

[0082] 1. The positioning of the fish body during the pectoral fin trimming and cutting process is achieved by the positioning of the fish mouth, the nitrogen spring 108 in the direction of the head, and the thrust of the brush roller 208 acting on the pectoral fin. After the fin is cut, the thrust of the brush roller 208 on the fish is lost, and the fish carrying component 1 is reset.

[0083] 2. During the linear motion of the electric cylinder 201, the processing status is determined based on the data changes of the pressure sensor 109. The distance and speed of the brush rollers 208 on both sides are adjusted in real time through the PLC electronic control system 5 to realize the motion control of the brush rollers 208.

[0084] 3. In terms of fish positioning and motion control, the pectoral fin preparation, fish feeding, and fin cutting of objects of different sizes can be achieved solely through the cooperation of the electric cylinder 201 and the synchronous belt drive mechanism. During the pectoral fin preparation stage, the distance between the two brush rollers 208 is minimized to facilitate fin separation; during the fin cutting stage, the distance between the two brush rollers 208 is maximized, ensuring that the positions of the two brush rollers 208 and the rotary cutter 304 are staggered, preventing the rotary cutter 304 from interfering with the brush rollers 208.

[0085] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and 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. Therefore, they should not be construed as limitations on this invention. In this invention, it should also be noted that the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integrally formed connection, a mechanical connection, or an indirect connection through intermediate connecting parts. The specific meaning of the terms in this utility model can be understood according to the specific circumstances.

[0086] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0087] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A device for locating and removing the pectoral fin of the spotted catfish, characterized in that, It includes a fish-carrying assembly (1), a fin positioning assembly (2), a cutting assembly (3), and a PLC electronic control system (5). The fish-carrying assembly (1) includes: a fixed support frame (107), with a front limiting plate (110) fixed at the front end of the support frame (107); a fish body positioning frame for supporting and positioning the spotted catfish (6), the fish body positioning frame being movably connected to the support frame (107) in the front and back; and a spring assembly, the front end of the fish body positioning frame being connected to the front limiting plate (110) through the spring assembly. The fin positioning assembly (2) includes: an electric cylinder (201); an electric cylinder connecting seat (202) fixedly connected to the telescopic rod of the electric cylinder (201); and a pectoral fin positioning component installed on the electric cylinder connecting seat (202). During operation, the pectoral fin positioning component positions the pectoral fin of the spotted catfish (6) and pushes the pectoral fin of the spotted catfish (6) to the position of the cutting assembly (3) to perform the operation of cutting the pectoral fin. After the pectoral fin is cut off, the fish body positioning frame is driven by the spring assembly to reset backward. The fish positioning frame includes: a fish body support plate (101) that extends front and rear as a strip-shaped flat plate for supporting a spotted catfish (6); a front convex plate (104) that protrudes upward from the front end of the fish body support plate (101) to define the position of the fish head, and the spring assembly is connected to the front convex plate (104); and a tongue-shaped cantilever (103) that is fixedly connected to the side of the front convex plate (104) facing the fish body and extends horizontally backward for inserting into the fish mouth to position the fish body. The spring assembly includes a nitrogen spring (108) and a pressure sensor (109). One end of the nitrogen spring (108) is connected to the front protrusion plate (104), and the other end of the nitrogen spring (108) is connected to the front limit plate (110) through the pressure sensor (109). The pectoral fin positioning component includes: The synchronous belt drive mechanism includes a main body, a synchronous belt servo driver (203), a synchronous belt, a drive wheel, and a driven wheel. The main body is fixedly connected to an electric cylinder connecting seat (202). The drive wheel and the driven wheel of the synchronous belt drive mechanism are rotatably connected to the main body. The output end of the synchronous belt servo driver (203) is connected to the drive wheel to drive the drive wheel, the driven wheel, and the synchronous belt to move. The first positioning unit and the second positioning unit are relatively movable. The first positioning unit and the second positioning unit are respectively provided with a first synchronous belt slider (204) and a second synchronous belt slider (206). The first synchronous belt slider (204) and the second synchronous belt slider (206) are respectively connected to the two opposite sides of the synchronous belt. The first synchronous belt slider (204) and the second synchronous belt slider (206) are relatively slidingly engaged with the main body. The first synchronous belt slider (204) and the second synchronous belt slider (206) are respectively fixedly installed with a first synchronous belt connecting plate (205) and a second synchronous belt connecting plate (207). Among them, the first synchronous belt connecting plate (205) and the second synchronous belt connecting plate (207) are both equipped with brush roller motors (209). Each brush roller motor (209) has a brush roller (208) that is in flexible contact with the fish body installed at its output end. The two brush rollers (208) are arranged at the same height. Under the drive of the synchronous belt drive mechanism, the distance between the two brush rollers (208) can be adjusted. When working, the two brush rollers (208) respectively move forward against the two pectoral fins of the spotted catfish (6). The compressible stroke of the nitrogen spring (108) is greater than 100 mm. The initial force of the nitrogen spring (108) sensed by the pressure sensor (109) is defined as F1, and the final force is defined as F2, where F2≈1.5F1. The distance W between the two brush rollers (208) is controlled by the synchronous belt drive mechanism according to the current output value F of the pressure sensor (109) to satisfy W = (21.5*F / F1+12.5) mm; The rotational speed N of the brush roller (208) is controlled by the frequency converter of the brush roller motor (209) according to the current output value F of the pressure sensor (109) and satisfies N=(205-39F / F1) revolutions / minute.

2. The device according to claim 1, wherein, The cutting blade assembly (3) includes: Fixed cutter support (306); A geared motor (301) is fixedly connected to a cutter support (306) and equipped with a cutter spindle (303). The output end of the geared motor (301) is coaxially fixed to the cutter spindle (303) through a coupling (302). A pair of spaced-apart bearing seats (305) are mounted on the cutter support (306), and the cutter spindle (303) of the geared motor (301) passes through the bearing seats (305) and is rotated with the bearing seats (305); Two rotary cutters (304) for removing the pectoral fins of the spotted catfish, the rotary cutters (304) being fixedly mounted on the cutter spindle (303) of the geared motor (301), the two rotary cutters (304) being directly opposite the two pectoral fins of the spotted catfish (6).

3. The device according to claim 1, wherein the device is a device for positioning and cutting the pectoral fin of Ictalurus punctatus. The fish body support plate (101) has tail limiting baffles (102) fixed on both the left and right sides of the tail. When positioning the fish body, the tail of the spotted catfish (6) is between the two tail limiting baffles (102). At least two sliders (105) are fixed at the bottom of the fish body support plate (101). A guide rail (106) is fixed on the support frame (107). The sliders (105) and the guide rail (106) slide back and forth.

4. The device according to claim 2, wherein, The rotary cutter (304) is a three-blade blade. When the rotary cutter (304) rotates, the rotation speed is greater than 2000 rpm and the maximum outer diameter is greater than 350 mm. The rotary cutter (304) rotates in multiples of 120°. When the rotary cutter (304) stops, the highest point is lower than the bottom surface of the fish support plate (101).

5. A method for positioning and cutting the pectoral fin of channel catfish based on the device of claim 2, characterized in that, Includes the following steps: S1. Place the spotted catfish (6) on the fish body tray (101), align the tongue-shaped cantilever (103) with the fish mouth and insert it into the fish mouth to fix the position of the spotted catfish (6); S2. The device is started. The electric cylinder (201) drives the brush roller (208) to move from the tail side of the fish towards the pectoral fin. During this process, the distance between the two brush rollers (208) is the smallest. The brush roller (208) positions the pectoral fin of the spotted catfish (6) and pushes the spotted catfish (6) towards the head. S3. As the fish body support plate (101) moves forward, the nitrogen spring (108) is compressed. The PLC control system (5) controls the synchronous belt servo driver (203) and the brush roller motor (209) according to the real-time output value of the pressure sensor (109), and dynamically adjusts the spacing and speed of the brush roller (208). S4. When the fish moves to the designated position and both pectoral fins are directly above the rotary cutter (304), the distance between the two brush rollers (208) is at its maximum, so that the positions of the two brush rollers (208) and the rotary cutter (304) are staggered. The deceleration motor (301) starts the two rotary cutters (304) to cut off the left and right fins, so that the fin positioning component (2) is separated from the spotted catfish (6). The fish body support plate (101) is unloaded. Then, driven by the elastic restoring force of the nitrogen spring (108), the fish body support plate (101) moves backward with the spotted catfish (6). Under the control of the PLC electronic control system (5), the electric cylinder (201) drives the brush rollers (208) to move backward.

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