Continuous automatic injection device for fishery vaccines

Abstract

The invention relates to a continuous automatic injection device for fishery vaccines, wherein a conveyor belt of a conveying device is connected to the end of an arc-shaped slide groove; an arc-shaped arm of a rotary push device pushes young grass carp that quickly passes on the conveyor belt into a working position of the injection device through the action of a swing arm; an injection rotating bottom plate can be driven by a rotating bottom plate swing cylinder to swing left and right, and when the injection rotating bottom plate is closed, the fish body that slides in can be received, and when the injection rotating bottom plate is opened, the injected young grass carp falls from the opening of the rotating bottom plate to a collecting tank; multiple groups of injection devices are arranged along the length direction of the conveying device; a fish body shape scanning device is arranged at a fish entry position of the conveyor belt of the injection device, and the specification and shape data of the fish body are collected in real time, and the moving distance of the slide table is controlled by a decision system to drive the change of the position of the injection needle; a pressure plate swing cylinder is used to apply pressure to a thin pressure plate to adjust the pressure on the fish body.

Description

Technical Field

[0001] The invention relates to a continuous automatic injection device for fishery vaccines, belonging to the technical field of fishery vaccine injection. Background Art

[0002] Domestic fishery catch is restricted by the influence of marine ecological environment, and aquaculture output continues to grow. Gradually, with the vigorous development of cage, factory and pond aquaculture, concentrated high-density aquaculture will bring various diseases to fish, resulting in high mortality and low survival rate during the aquaculture process, affecting the number of adult fish on the market, causing adult fish price fluctuations, and affecting the interests of aquaculture companies. Grass carp vaccination can effectively prevent and control several common epidemics of grass carp viral hemorrhage, red skin, enteritis and gill rot. Vaccine injection can ensure that the survival rate of fish pond aquaculture is increased to more than 90%. However, most of the fish vaccine injections are currently artificially injected, which has a large amount of labor, high labor intensity, and requires high labor costs. In addition, artificial injections are mainly based on feelings to determine the depth and injection site, so the injection effect is not ideal.

[0003] A Chinese patent document with a publication date of January 10, 2020 and publication number CN110664505A discloses a "grass carp vaccine identification and continuous automatic injection method and device", which mainly involves design considerations on the automatic injection process of grass carp. However, the key to machine injection is to reduce damage to the fish body during the turnover, turning, smooth transportation, identification and pushing, positioning, fixation, and injection of fish after anesthesia, as well as to automatically adjust to the precise injection site according to the different specifications of the fish body, and realize continuous machine automatic injection to improve injection efficiency. None of these are involved in this comparative document, so there are still deficiencies in design considerations in the specific implementation. Summary of the invention

[0004] The purpose of the present invention is to provide a continuous automatic injection device for fishery vaccines, which can realize the processes of turnover, turning, smooth transportation, identification and pushing, positioning, fixing, injection, etc. of anesthetized fish, and minimize the damage to the fish body during the implementation process; it can automatically adjust to the precise injection site according to the different specifications of the fish body, and realize continuous machine automatic injection at the same time, thereby greatly improving the injection efficiency.

[0005] The present invention adopts the following technical solutions:

[0006] A device for continuous automatic injection of fishery vaccines, comprising: an arc chute 1, the arc chute 1 is used for turning the fish body; a conveying device 2, the conveying belt of the conveying device 2 is connected to the end of the arc chute 1; a rotary push device 4, the arc arm 4-1 of the rotary push device 4 pushes the young grass carp passing quickly on the conveyor belt into the working position of the injection device 3 through the swing arm action; the injection device 3, the injection device 3 comprises an injection rotating bottom plate 3-7, a thin pressing plate 3-2, a pressing plate swinging cylinder 3-1, a rotating bottom plate swinging cylinder, and a slide 3-10; the injection rotating bottom plate 3-7 can be rotated by the rotating bottom plate The swing cylinder drives the injection rotating bottom plate 3-7 to swing left and right. When the injection rotating bottom plate 3-7 is closed, the fish body can be received. When the injection rotating bottom plate 3-7 is opened, the injected young grass carp falls from the opening of the rotating bottom plate to the collection tank. The injection device 3 is arranged in multiple groups along the length direction of the conveying device 2. At the fish inlet position of the conveyor belt of the injection device, a fish body shape scanning device is provided to collect the fish body specification and shape data in real time, and the sliding distance of the slide is controlled by the decision-making system to drive the change of the injection needle position. The pressure plate swing cylinder 3-1 is used to apply pressure to the thin pressure plate 3-2 to adjust the pressure on the fish body.

[0007] Preferably, the injection rotating base plate 3-7 is mounted and fixed on the plane of the end of the swing column of the base plate swing cylinder. The upper edge of the bottom plate is close to the lower edge of the injection conveyor belt and has a 10-20 degree downward folding surface; a vertical baffle and an inclined baffle are set at the end of the injection rotating bottom plate 3-7, and the angle of the inclined baffle is set according to the angle between the inclined surface of the fish head and the plane of the fish abdomen, which serves as a positioning block for sliding the head of the young grass carp; the injection rotating bottom plate swing cylinder is installed on the upper horizontal plate of the frame; the slide assembly is fixed on the frame, the L-shaped bottom plane of the moving frame is connected to the slide 3-10 on the slide assembly, and the L-shaped moving frame 3-14 can translate with the movement of the slide; the moving range is automatically adjusted according to the specifications of the injected fish; the upper part of the L-shaped moving frame is folded into an L shape, the vertical surface of the L shape contacts the side of the injection rotating bottom plate, the ventral surface of the young grass carp lying flat on the rotating bottom plate is flush with the vertical surface of the L shape, the pressing plate swing cylinder 3-1 is installed on one side of the vertical surface of the L-shaped moving frame, and the thin pressing plate 3-2 is installed on the end face of the swing axis of the pressing plate swing cylinder 3-1.

[0008] Preferably, the contour line of the arc-shaped arm 4-1 is one of an arc shape and a parabola shape, which is mainly designed in combination with the shape of the fish back and the conveying speed.

[0009] Preferably, the bottom surface of the arc-shaped arm 4 - 1 is slightly higher than the conveyor belt by 1 mm to 2 mm, which is just enough to move the young grass carp without touching the conveyor belt.

[0010] Preferably, the swing angular velocity of the arc arm 4-1 is determined according to the friction coefficient between the fish body and the belt under water, so that the young grass carp is just pushed into the station of the injection device and is positioned by slightly contacting the vertical surfaces of the injection rotating bottom plate 3-7 and the L-shaped movable frame 3-14.

[0011] Preferably, the injection device 3 also includes a syringe 3-8, an injection needle 3-6, an injection piston assembly, and a needle insertion and extraction assembly; when the young grass carp enters the injection station, the pressure plate swing cylinder 3-1 uses the axis of the pressure plate swing cylinder 3-1 as a fulcrum, and the pressure plate swing cylinder 3-1 drives the thin pressure plate 3-2 to press the body of the young grass carp, so as to facilitate the injection of the vaccine; after the injection is completed, the pressure plate swing cylinder 3-1 drives the thin pressure plate 3-2 to flip up, so as to facilitate the subsequent young grass carp to enter the injection position; a counterweight hole is opened at the rear end of the thin pressure plate 3-2 for accurately adjusting the pressure of the thin pressure plate 3-2; a long waist hole is provided at the front of the thin pressure plate 3-2, so as to facilitate the injection needle to penetrate into the fish body through the long waist hole.

[0012] Furthermore, the injection device 3 is fixed on a movable bracket 3-11, and the movable bracket 3-11 can swing around the fulcrum on the plane of the L-shaped movable bracket 3-14. A cam groove 3-12 is provided at the rear, and a cam is provided in the cam groove 3-12. The support seat of the cam is fixed to the frame; the cam is driven by the driving device of the slide 3-10, driving the injection cylinder 3-4 to move in the X direction while also moving in the Y direction to adapt to the position of the fish body; the contour line of the cam groove 3-12 is set according to the horizontal and vertical distance coordinates of the injection points of different specifications of the fish body.

[0013] Preferably, the slide 3-10 is driven by a screw motor inside it, driving the movable bracket fixed on the slide to translate; the cylinder fixed on the upper inclined surface of the movable bracket 3-11 drives the syringe as a whole to make reciprocating linear motion at an angle of 45 degrees, and the movement distance is 10-30mm; the piston in the syringe presses the injection liquid into the fish body through the injection needle, and the movement of the piston in the syringe is driven by another cylinder. The piston push rod is provided with a spring to reset the piston after injection; the top of the piston push rod is provided with a thread connected to a nut, and the stroke of pushing the piston is adjusted by adjusting the height of the nut, thereby adjusting the amount of injection medicine.

[0014] Preferably, the injection stations and the rotary pushing device 4 are arranged alternately, and when the visual device detects the dorsal orientation of the fish, the rotary pushing device 4 and the injection station of the corresponding station are controlled to trigger the action to complete the injection.

[0015] Preferably, the rotary pushing device 4 rotates in one direction.

[0016] The beneficial effects of the present invention are:

[0017] 1) When adjusting the position of the entire syringe relative to the fish body, the X-axis linear power mechanism of the slide is used, and the design of the cam and the cam groove is utilized to simultaneously realize the Y-axis movement of the entire syringe according to the set amplitude (according to the design of the cam groove), thereby achieving a more accurate correspondence with the optimal injection position of the fish body.

[0018] 2) During injection, the anesthetized young fish is quickly positioned, the thin pressure plate 3-2 is pressed and fixed with a slight force, and the slide 3-10 is quickly moved to enable the injection needle to be quickly adjusted according to the size of the fish body. The injection site is always controlled at the base area of ​​the fish spine, and the injection depth and injection volume are adjustable to achieve the purpose of precise injection.

[0019] 3) The pushing device adopts an arc-shaped structure, which pushes the fish's back sideways by rotating and pushing it into the injection station. Compared with the reciprocating swing arm of the previous sorting machine, it causes less damage to the fish. In addition, it adopts a 360-degree rotating arm structure, which will not interfere with the subsequent transportation of fish like the reciprocating swing arm needs to be reset.

[0020] 4) Taking advantage of the physical factor that the fish head is heavy and the fish tail is light, combined with the speed and curvature of the conveyor belt in the fish turning area, the young fish with the tail ahead can be quickly turned around to make the fish head face forward. This facilitates the identification, positioning and injection of subsequent injections, and improves the efficiency of continuous operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an overall structural diagram of the continuous automatic injection device for fishery vaccines of the present invention.

[0022] Figure 2 It is a partial detail diagram of the continuous automatic injection device for fishery vaccines of the present invention.

[0023] Figure 3 It is a partial detail view of the continuous automatic injection device for fishery vaccines of the present invention from another viewing angle.

[0024] Figure 4 This is a diagram showing the relationship between the cam contour of the mobile rack and the specifications of the fish body. The perspective of this picture is a bird's-eye view.

[0025] In the figure, 1. arc-shaped slide (young fish turning device), 2. conveying device, 3. injection device, 3-1. pressure plate swing cylinder, 3-2. thin pressure plate, 3-3. syringe moving cylinder, 3-4. injection cylinder, 3-5. spring, 3-6, injection needle, 3-7. injection rotating bottom plate, 3-8. syringe, 3-9. anesthetized fish, 3-10. slide, 3-11. movable bracket, 3-12. cam groove, 3-13. rack, 3-14. L-shaped movable rack, 4. rotary pushing device, 4-1. arc-shaped arm, 4-2. driving device, 5. visual system, 6. water spraying device, 7. fish unloading trough. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] This embodiment is directed to a continuous automatic injection device for fishery vaccines. Figure 1 :

[0028] The anesthetized fry on the conveyor belt of the fry turning device 1 is sent to the right end. Under the synergistic effect of the curvature of the belt wrap angle and the moving speed, the fry with its head forward will fall into the arc chute 1 at the bottom after passing through the arc surface of the conveyor belt, and enter the conveyor belt of the injection device under the guidance of the arc chute 1 and the lubrication of water. If the tail of the fish is in front, the tail of the fry will be stuck to the conveyor belt surface after passing through the wrap angle of the conveyor belt, and the head of the fish will be reversed forward under the action of inertia. When it finally falls into the arc trough, the head of the fish is forward and the tail of the fish is behind, completing the turning process and entering the conveyor belt of the injection device.

[0029] At the fish entry part of the conveyor belt of the injection device, a fish shape scanning device is provided. The device can be a visual device such as a grating, color recognition or camera. This technology is a prior art. Please refer to the comparative documents cited in the background technology, which will not be described here. By collecting the fish body specification and shape data in real time, the sliding table movement distance is controlled by the decision system to drive the change of the injection needle position. Finally, the change of fish body specifications is achieved, and the injection site is always controlled within the base range of the fish body back spine. At the same time, according to the constant belt conveyor speed, the arc push rod action time and the slide of the corresponding injection station are determined to move and rotate according to the fish body specifications → the bottom plate is closed → the young fish enters the injection area of ​​the rotating bottom plate → the thin pressure plate gently presses the fish body → the injection needle pierces the fish body → the liquid medicine is injected → the rotating bottom plate is opened to put down the injected young fish → all actions are reset. Other injection stations can be copied here.

[0030] Before the anesthetized young fish enters the set injection station, the arc-shaped arm 4-1 of the rotary push device 4 pushes the young grass carp passing quickly on the conveyor belt into the station of the injection device 3 through the action of the swing arm. The contour of the arc-shaped arm 4-1 can be arc-shaped, parabolic, or even straight, mainly designed in combination with the shape of the fish back and the conveying speed. The bottom surface of the arc-shaped swing arm is slightly higher than the conveyor belt by 1mm-2mm, which can just move the young grass carp without touching the belt. According to the friction coefficient between the fish body and the belt under water, the swing angular velocity of the arc-shaped swing arm is determined, so that the young grass carp is just pushed into the station of the injection device, and the rotating bottom plate and the L-shaped vertical surface of the upper part of the movable frame are slightly contacted and positioned.

[0031] The injection device 3 structurally includes: an injection rotating base plate 3-7, a thin pressure plate 3-2 and a pressure plate swing cylinder 3-1, a slide 3-10, a specification adjustment mechanism, a slide bracket, a syringe 3-8, an injection needle 3-6, an injection piston assembly, and a needle insertion and extraction assembly. The injection rotating base plate 3-7 is installed and fixed on the plane of the swing column end of the swing cylinder. The upper edge of the base plate is close to the lower edge of the injection conveyor belt and has a 10-20 degree downward folding surface. When the rotating base plate 3-7 is closed, it is convenient for the young grass carp to slide from the conveyor belt into the rotating base plate. When the rotating base plate is opened, the injected young grass carp falls from the opening of the rotating base plate to the collection tank. Vertical and inclined baffles are provided at the end of the rotating base plate, such as Figure 2 As shown, the angle of the inclined baffle is set according to the angle between the inclined surface of the fish head and the plane of the fish abdomen, which serves as a positioning block for sliding into the head of the young grass carp. The swing cylinder 3-1 of the rotating bottom plate is installed on the upper horizontal plate of the frame. The slide assembly is fixed on the frame, and the L-shaped bottom plane of the mobile frame is connected to the slide on the assembly, and the L-shaped mobile frame 3-14 can translate with the movement of the slide. The moving range is automatically adjusted according to the specifications of the injected fish. The upper part of the L-shaped mobile frame is folded into an L shape, and the vertical surface of the L-shaped mobile frame contacts the side of the injection rotating bottom plate (the rotating bottom plate and the L-shaped side are closed), and the ventral surface of the young grass carp lying on the rotating bottom plate is flush with the vertical surface of the L shape. The pressure plate swing cylinder 3-1 is installed on one side of the L-shaped vertical surface, and the thin pressure plate 3-2 is installed on the end face of the cylinder swing shaft. When the young grass carp enters the injection station, the pressure plate swing cylinder 3-1 is used as a fulcrum, and the pressure plate swing cylinder 3-1 drives the thin pressure plate to press the young grass carp body, which is convenient for injecting vaccines. After the injection is completed, the plate swing cylinder 3-1 drives the thin plate to flip up, so that the subsequent young grass carp can enter the injection position. A counterweight hole is opened at the rear end of the thin plate 3-2 to further adjust the pressure of the thin plate 3-2. A long waist hole is provided at the front of the thin plate 3-2, such as Figure 2 As shown, it is convenient for the injection needle to penetrate into the fish body through the long waist hole.

[0032] See also Figure 3 The movable bracket 3-11 can swing around the fulcrum of the L-shaped plane, and a cam groove 3-12 is arranged at the rear, a cam is arranged in the groove, and the support seat of the cam is fixed to the frame. The contour line of the cam groove 3-12 is based on the change track of the horizontal and vertical distance coordinates of the injection points of different specifications of young grass carp. The upper inclined surface of the movable bracket is fixed to the refraction component so that the injection needle is at an angle of 30-45 degrees to the horizontal plane. The acupuncture depth is 2-3mm.

[0033] The cylinder fixed on the upper inclined surface of the movable bracket drives the syringe to make a reciprocating linear motion at a 45-degree angle, with a moving distance of 10-30mm, depending on the thickness of the fish body. The needle can be inserted into and pulled out of the fish body.

[0034] It should be noted here that when the position of the injector as a whole is adjusted relative to the fish body, the X-direction (along the conveyor belt direction) linear power mechanism of the slide is adopted, and the design of the cam and the cam groove is utilized to simultaneously realize the Y-direction (perpendicular to the conveyor belt direction in the horizontal plane) movement of the injector as a whole according to the set amplitude (according to the design of the cam groove), thereby achieving a more accurate correspondence with the optimal injection position of the fish body.

[0035] The piston in the syringe pushes the injection liquid into the body through the injection needle. The movement of the piston in the syringe is driven by another cylinder. The piston push rod is equipped with a spring to reset the piston after injection. The top of the piston push rod is equipped with a thread connected to a nut. By adjusting the height of the nut, the stroke of the piston is adjusted, and then the amount of injection is adjusted.

[0036] After the injection, the young fish fall into the fish unloading trough below due to the swinging bottom plate, and are washed to the fish farming pool outside the trough by the water flow.

[0037] It should be noted that during injection, the belly of the fish is required to be close to the L-shaped vertical surface of the upper part of the mobile frame in the injection station. However, the direction of the fish's back and belly entering the conveyor belt is uncertain, and a more complex turning mechanism is usually used, and the success rate is low. In order to reduce the adjustment of the position of the fish's back and belly, the injection station and the arc swing device can be placed alternately. When the visual device measures the direction of the fish's back and belly, the control triggers the corresponding station push rod and the injection station action to complete the injection, effectively solving the problem of fish turning over.

[0038] The present invention realizes the mechanical automation of the whole injection process, including anesthetizing the young fish → turning → conveying → vision → decision-making → closing the bottom plate → the young fish entering the injection area of ​​the rotating bottom plate → the thin pressure plate gently presses the fish body → the injection needle pierces the fish body → injects the liquid medicine → the rotating bottom plate opens to put down the injected young fish → all actions are reset. The grading, fish suction and other equipment in the supporting industry can completely replace manual fishing, screening and injection operations. The machine injection has high precision, the injection site is accurate, and the injection efficiency is greatly improved compared with manual injection.

[0039] The above are preferred embodiments of the present invention. A person skilled in the art may make various changes or improvements on this basis. Without departing from the general concept of the present invention, these changes or improvements should fall within the scope of protection claimed by the present invention.

Claims

1. A continuous automatic injection device for fishery vaccines, characterized in that: include: An arc-shaped slide groove (1); the arc-shaped slide groove (1) is used for turning the fish body; A conveying device (2); the conveying belt of the conveying device (2) is connected to the end of the arc-shaped chute (1); A rotary pushing device (4); the arc-shaped arm (4-1) of the rotary pushing device (4) pushes the young grass carp passing quickly on the conveyor belt into the working station of the injection device (3) through the swinging action of the arm; An injection device (3); the injection device (3) comprises an injection rotating bottom plate (3-7), a thin pressing plate (3-2), a pressing plate swinging cylinder (3-1), a rotating bottom plate swinging cylinder, and a slide (3-10); the injection rotating bottom plate (3-7) can be driven by the rotating bottom plate swinging cylinder to swing left and right, and when the injection rotating bottom plate (3-7) is closed, it can receive the fish body that slides in, and when the injection rotating bottom plate (3-7) is opened, the injected young grass carp falls from the opening of the rotating bottom plate to the collection tank; the injection device (3) is arranged in multiple groups along the length direction of the conveying device (2); a fish body shape scanning device is arranged at the fish feeding part of the conveying belt of the injection device, which collects the specification and shape data of the fish body in real time, and controls the moving distance of the slide through the decision system to drive the change of the injection needle position; the pressing plate swinging cylinder (3-1) is used to apply pressure to the thin pressing plate (3-2) to adjust the pressure on the fish body; The injection rotating bottom plate (3-7) is installed and fixed on the plane of the end of the swing column of the bottom plate swing cylinder, the upper edge of the bottom plate is close to the lower edge of the injection conveyor belt, and has a 10-20 degree inclined downward folding surface; a vertical baffle and an inclined baffle are arranged at the end of the injection rotating bottom plate (3-7), and the angle of the inclined baffle is set according to the angle between the inclined surface of the fish head and the plane of the fish abdomen, which serves as a positioning block for the head of the young grass carp to slide in; the injection rotating bottom plate swing cylinder is installed on the upper horizontal plate of the frame; the slide assembly is fixed on the frame, and the L-shaped bottom plane of the moving frame is aligned with the slide The L-shaped movable frame 3-14 can be moved horizontally with the movement of the sliding frame; the moving range is automatically adjusted according to the specifications of the injected fish; the upper part of the L-shaped movable frame is folded into an L shape, the vertical surface of the L shape contacts the side of the injection rotating bottom plate, the ventral surface of the young grass carp lying flat on the rotating bottom plate is flush with the vertical surface of the L shape, the pressing plate swing cylinder (3-1) is installed on one side of the vertical surface of the L-shaped movable frame, and the thin pressing plate (3-2) is installed on the end surface of the swing axis of the pressing plate swing cylinder (3-1); The contour line of the arc-shaped arm (4-1) is one of an arc shape and a parabola shape, and is mainly designed in combination with the shape of the fish back and the conveying speed.

2. The continuous automatic injection device for fishery vaccines according to claim 1, characterized in that: The bottom surface of the arc-shaped arm (4-1) is slightly higher than the conveyor belt by 1mm-2mm, which can just move the young grass carp without touching the conveyor belt.

3. The continuous automatic injection device for fishery vaccines according to claim 1, characterized in that: The swing angular velocity of the arc-shaped arm (4-1) is determined according to the friction coefficient between the fish body and the belt under water, so that the young grass carp is just pushed into the working station of the injection device and slightly contacts the vertical surfaces of the injection rotating bottom plate (3-7) and the L-shaped moving frame (3-14) to be positioned.

4. The continuous automatic injection device for fishery vaccines according to claim 1, characterized in that: The injection device (3) also includes a syringe (3-8), an injection needle (3-6), an injection piston assembly, and a needle insertion and extraction assembly. When the young grass carp enters the injection station, the pressure plate swing cylinder (3-1) uses the axis of the pressure plate swing cylinder (3-1) as a fulcrum to drive the thin pressure plate (3-2) to press the young grass carp body, thereby facilitating the injection of the vaccine. After the injection is completed, the pressure plate swing cylinder (3-1) drives the thin pressure plate (3-2) to flip up, thereby facilitating the subsequent young grass carp to enter the injection position. A counterweight hole is provided at the rear end of the thin pressure plate (3-2) for accurately adjusting the pressure of the thin pressure plate (3-2). A long waist hole is provided at the front of the thin pressure plate (3-2), thereby facilitating the injection needle to penetrate into the fish body through the long waist hole.

5. The continuous automatic injection device for fishery vaccines according to claim 4, characterized in that: The injection device (3) is fixed on a movable bracket (3-11), and the movable bracket (3-11) can swing around a fulcrum on the plane of an L-shaped movable bracket (3-14). A cam groove (3-12) is arranged at the rear, and a cam is arranged in the cam groove (3-12). The support seat of the cam is fixed to the frame; the cam is driven by a driving device of a slide table (3-10), and drives the injection cylinder (3-4) to move in the X direction and also in the Y direction to adapt to the position of the fish body; the contour line of the cam groove (3-12) is set according to the horizontal and vertical distance coordinates of injection points of different specifications of the fish body.

6. The continuous automatic injection device for fishery vaccines as claimed in claim 5, characterized in that: The slide table (3-10) is driven by a screw motor inside the slide table, driving the movable bracket fixed on the slide table to move horizontally; the cylinder fixed on the upper inclined surface of the movable bracket (3-11) drives the syringe as a whole to perform reciprocating linear motion at an angle of 45 degrees, and the moving distance is 10-30mm; the piston in the syringe presses the injection liquid into the fish body through the injection needle, and the movement of the piston in the syringe is driven by another cylinder. The piston push rod is provided with a spring to reset the piston after injection; the top of the piston push rod is provided with a thread connected to a nut, and the stroke of pushing the piston is adjusted by adjusting the height of the nut, thereby adjusting the injection amount.

7. The continuous automatic injection device for fishery vaccines according to claim 1, characterized in that: The injection stations and the rotary pushing device (4) are arranged alternately with each other. When the visual device detects the belly and back direction of the fish, the rotary pushing device (4) and the injection station at the corresponding station are controlled to trigger the action to complete the injection.

8. The continuous automatic injection device for fishery vaccines as claimed in claim 1, characterized in that: The rotary pushing device (4) is unidirectionally rotating.

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