A method for continuously removing fish heads and viscera

Abstract

A method for continuously removing fish heads and internal organs is disclosed. A fish head and internal organs removal machine is used to remove fish heads and internal organs. The method comprises the following steps: placing a fish flat in a fish holding tank; a first cutter cuts the upper portion of the connection between the fish head and body; a second cutter cuts the lower portion of the connection between the fish head and body; a fish body conveyor belt conveys the fish body in the fish body tank backward; a fish head conveyor belt rotates the fish head tank around a first center; and a third cutter cuts the fish back at the connection between the fish head and body. The method uses the first and second cutters to cut open both sides of the connection between the fish head and body, and the third cutter to cut off the fish bones at the connection between the fish head and body at the fish back. This method can process fish of various types and sizes, and is highly versatile. The fish head conveyor belt and the fish body conveyor belt convey synchronously and then separately. During the separate conveyance, the fish head is twisted, pulling the internal organs out of the fish body. The entire process can be performed continuously as the fish head conveyor belt and the fish body conveyor belt operate.

Description

Technical Field

[0001] The invention relates to the field of aquatic product processing equipment, in particular to a method for continuously removing fish heads and internal organs. Background Art

[0002] my country's total aquatic product output is enormous, much of which needs to be processed into fish meat products. To obtain the meat, fish heads and internal organs must be removed. Traditionally, this method relies on manual processing, resulting in low yields and high labor intensity. Automatic fish-killing machines are now available on the market that can cut open and remove internal organs, but these can only handle larger fish. There are also devices available for processing smaller fish, some of which simply remove the fish's head with a slicing knife. These devices can only process small fish and are inefficient. Summary of the Invention

[0003] The object of the present invention is to overcome the above-mentioned shortcomings and provide a method for continuously removing fish heads and internal organs that can efficiently process small and medium-sized fish.

[0004] To achieve the above object, the technical solution of the present invention is: a method for continuously removing fish heads and internal organs, using a fish head and internal organs removal machine to remove the fish head and internal organs, comprising the following steps:

[0005] In the synchronous conveying section, the fish is placed flat into the fish fixing trough with the fish head facing the fish head trough, the fish body facing the fish body trough, and the fish back facing the side. The fish fixing trough consists of a fish head trough and a fish body trough. The fish body conveyor belt carries the fish body trough and the fish head conveyor belt carries the fish head trough to convey synchronously backwards.

[0006] The fish head pressing plate presses the fish head in the fish head slot, the fish body pressing plate presses the fish body in the fish body slot, the first cutter cuts the upper part of the connection between the fish head and the fish body, and the second cutter cuts the lower part of the connection between the fish head and the fish body.

[0007] The fish body conveyor belt carries the fish body in the fish body trough backward, and the fish head conveyor belt carries the fish head trough to rotate around the first center. The direction-changing pressure plate presses the fish head in the rotating fish head trough. The fish head rotates with the fish head trough, and the fish back position at the connection between the fish head and the fish body is turned to the third cutter. The third cutter cuts the fish back position at the connection between the fish head and the fish body. The fish head trough continues to rotate to break the connection between the fish head and the fish body, and the fish head and the internal organs are separated from the fish body.

[0008] The fish head trough continues to rotate and disengages from the changing pressure plate, and the fish heads in the fish head trough fall out of the trough. The fish head conveyor belt transports the discharged fish head trough to the synchronous conveying section;

[0009] The fish body trough rotates around the second center to pour out the fish body, and the fish body conveyor belt conveys the fish out of the fish body trough to the synchronous conveying section.

[0010] The present invention uses a first cutter and a second cutter to cut the upper and lower surfaces of the connection between the fish head and the fish body, and a third cutter to cut the bones at the fish back at the connection between the fish head and the fish body. Under the continuous conveyance of the fish head conveyor belt and the fish body conveyor belt, small and medium-sized fish can be continuously cut at the connection between the fish head and the fish body. During the cutting process of the connection between the fish head and the fish body, the fish head and the fish body are conveyed separately, and the fish viscera are pulled out of the fish body along with the fish head.

[0011] Preferably, the fish head and viscera removal machine comprises a fish body conveyor belt, a fish head conveyor belt, a first cutter, a second cutter, a third cutter, and a direction-changing pressure plate;

[0012] The fish body conveyor belt is provided with a fish body trough, and the fish head conveyor belt is provided with a fish head trough; the fish body conveyor belt includes a first conveying section, and the fish head conveyor belt includes a second conveying section and a direction-changing conveying section. Both the first conveying section and the second conveying section convey horizontally backward, and the direction-changing conveying section is provided at the rear end of the second conveying section. The conveying direction of the direction-changing conveying section is different from that of the first conveying section. The fish head trough conveys from one end of the direction-changing conveying section to the other end and can turn as the conveying direction of the direction-changing conveying section changes;

[0013] The front portion of the first conveying section and the second conveying section are arranged side by side to form a synchronous conveying section. The fish body slots and the fish head slots of the synchronous conveying section correspond to each other one by one. One fish body slot and one fish head slot form a fish fixing slot in the synchronous conveying section. The gap between the fish body slot and the fish head slot constitutes a cutting slot. The first cutting knife is arranged on the upper side of the synchronous conveying section, and the lower part of the first cutting knife extends into the upper part of the cutting slot. The second cutting knife is arranged on the lower side of the synchronous conveying section, and the upper part of the second cutting knife extends into the lower part of the cutting slot.

[0014] The changing pressure plate is arranged on the outside of the changing conveying section, used to cover the notch of the fish head slot on the changing conveying section; the third cutter is arranged between the changing conveying section and the first conveying section, and the lower end of the third cutter can extend into the gap between the fish head slot and the fish body slot.

[0015] Preferably, the method further includes the following steps: after the fish is placed in the fish holding tank and before the fish enters the fish head pressing plate and the fish body pressing plate, a dragging brush roller rotating above the fish holding tank drives the fish to move toward the fish head tank, which is a trapezoidal tank that gradually contracts outward. Since the length and width of fish often vary, the dragging brush roller can drag the fish placed in the fish holding tank toward the fish head tank, so that the fish head can be stuck in the fish head tank, thereby preventing the fish head from falling out of the fish head tank as the fish head tank rotates.

[0016] Preferably, the method further includes the following steps: after the fish head trough is separated from the deflection pressure plate, the ejecting teeth of the ejecting wheel extend into the fish head trough, the ejecting wheel is rotatably arranged on the side of the fish head conveyor belt, and a circle of ejecting teeth is arranged on the outer circumference of the ejecting wheel. When the ejecting wheel is rotated, the ejecting teeth can extend into the fish head trough. After the fish head is stuck in the trapezoidal fish head trough, although it is not easy to loosen when the third cutter cuts the rotating fish head, after the fish head is separated from the fish body, the fish head may be stuck in the fish head trough and cannot fall off under the action of gravity. The ejecting wheel can extend the ejecting teeth into the fish head trough to push the fish head out of the fish head trough.

[0017] Preferably, the fish body conveyor belt includes a first chain, a first sprocket, a second sprocket, and a first chain plate, the second sprocket is arranged behind the first sprocket, the first chain is annular and is wound around the first sprocket and the second sprocket, and the upper part of the first chain between the first sprocket and the second sprocket constitutes a first conveying section; the first chain is filled with first chain plates along the length direction, and each first chain plate is provided with a fish body groove; the second center is the rotation center of the second sprocket;

[0018] The fish head conveyor belt includes a second chain, a third sprocket, a fourth sprocket, a fifth sprocket, and a second chain plate; the fourth sprocket is located behind the third sprocket, and the fifth sprocket is located below and in front of the fourth sprocket. The second chain is annular and is simultaneously wound around the third sprocket, the fourth sprocket, and the fifth sprocket. The part of the second chain between the third sprocket and the fourth sprocket constitutes a second conveying section, and the part of the second chain wound around the fourth sprocket constitutes a changing conveying section. The second chain is filled with second chain plates along the length direction; each second chain plate is provided with a fish head groove; the first center is the rotation center of the fourth sprocket.

[0019] Preferably, the method further comprises the following steps:

[0020] The controller controls the servo motor to drive the knife holder to rotate forward, so that the third cutter on the knife holder moves toward the fish and cuts the fish back at the junction of the fish head and the fish body. When the controller determines that the torque value of the torque sensor on the servo motor has exceeded the torque threshold within the time T, the controller controls the servo motor to stop driving the knife holder to rotate forward.

[0021] The third cutter is rotatably arranged on the knife holder, and the knife holder is rotatably arranged on the machine frame. A servo motor for driving the knife holder to rotate is arranged on the machine frame, and a torque sensor is arranged on the rotating shaft of the servo motor.

[0022] Fish of different sizes and types often have bones in different locations at the junction of the head and body. If the third cutter is fixed in one position, it can easily leave the bones uncut or sever the connection between the head and internal organs. The controller uses the torque sensor to determine whether the third cutter has cut the fish bones, thereby controlling the third cutter's stroke. Time T is the average time over which the servo motor's torque changes significantly when the third cutter cuts the bones at the junction of the head and body, as measured by multiple tests. The torque threshold is the average value of the servo motor's torque changes during time T, when the third cutter cuts fish bones multiple times.

[0023] By adopting the above-mentioned technical solution, the beneficial effects of the present invention are as follows: the present invention uses a first cutter and a second cutter to cut the two sides of the connection between the fish head and the fish body, and uses a third cutter to cut the fish bones on the back of the fish at the connection between the fish head and the fish body. This allows the processing of fish of various types and sizes, and is highly versatile. The first cutter, the second cutter, and the third cutter can effectively cut the connection between the fish head and the fish body while preserving the connection between the internal organs and the fish head. The fish head conveyor belt and the fish body conveyor belt are first conveyed synchronously and then conveyed separately. During the separate conveyance, the fish head is twisted, and the internal organs are dragged out of the fish body. The entire process can be carried out continuously as the fish head conveyor belt and the fish body conveyor belt operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a schematic diagram of the local structure of the present invention;

[0026] Figure 3 It is a structural schematic diagram of a part of the present invention from another angle;

[0027] Figure 4 It is a structural schematic diagram of the position of the direction-changing conveying section of the present invention.

[0028] Figure 5 This is a positional relationship diagram of the top material wheel and the fish head conveyor belt of the present invention;

[0029] Figure 6 It is a structural schematic diagram of the third cutter position of the present invention.

[0030] Description of main reference numerals:

[0031] Fish body conveyor belt 1; first sprocket 11; second sprocket 12; first chain 13; first chain plate 14; fish body groove 141; baffle 141; fish head conveyor belt 2; second chain plate 21; fish head groove 211; second chain 22; third sprocket 23; fourth sprocket 24; fifth sprocket 25; first cutter 31; second cutter 32; third cutter 33; tool holder 4; drag brush roller 5; fish body pressure plate 61; fish head pressure plate 62; change direction pressure plate 63; servo motor 7; first conveying section 81; second conveying section 82; change direction conveying section 83; ejector wheel 9; ejector teeth 71. DETAILED DESCRIPTION

[0032] The present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1-6 As shown, the present invention provides a method for continuously removing fish heads and internal organs, using a fish head and internal organs removing machine to remove the fish head and internal organs.

[0034] The fish head and viscera removal machine includes a fish body conveyor belt 1, a fish head conveyor belt 2, a first cutter 31, a second cutter 32, a third cutter 33, a fish tail cutter, a fish body pressure plate 61, a fish head pressure plate 62, a changing pressure plate 63, a knife holder 4, a dragging brush roller 5, a servo motor 7; and a top material wheel 9.

[0035] like Figure 2 As shown, the fish body conveyor belt 1 includes a first sprocket 11, a second sprocket 12, a first chain 13, and a first chain plate 14. The second sprocket 12 is located behind the first sprocket 11. The first chain 13 is annularly wound around the first and second sprockets 11 and 12. The first chain 13 is filled with first chain plates 14. Each first chain plate 14 is provided with a fish body groove 141 and a baffle 142, which is located on the side away from the fish head groove. The upper portion of the first chain 13 between the first sprocket 11 and the second sprocket 12 constitutes the first conveying section.

[0036] like Figure 2 and Figure 3 As shown, the fish head conveyor belt 2 includes a second chain plate 21, a second chain 22, a third sprocket 23, a fourth sprocket 24, and a fifth sprocket 25. The fourth sprocket 24 is located behind the third sprocket 23, and the fifth sprocket 25 is located below and in front of the fourth sprocket 24. The second chain 22 is annular and is wound around the third sprocket 23, the fourth sprocket 24, and the fifth sprocket 25. The second chain 22 is fully lined with the second chain plates 21. Each second chain plate 21 is provided with a fish head slot 211. The fish head slot 211 is a trapezoidal groove that gradually tapers toward the positioning plate. The portion of the second chain 22 between the third sprocket 23 and the fourth sprocket 24 constitutes the second conveying section 82, and the portion of the second chain wound around the fourth sprocket constitutes the redirecting conveying section.

[0037] like Figure 2and Figure 3 As shown, the first conveying section 81 and the second conveying section 82 both convey fish horizontally in a rearward direction, with the diverting conveying section 83 located at the rear end of the second conveying section 82. The conveying direction of the diverting conveying section 83 differs from that of the first conveying section 81. The diverting conveying section 83 is curved and can be switched from horizontally conveying fish backward to conveying fish downward. The fish head trough 211 on the fish head conveyor belt 2 conveys fish from one end of the diverting conveying section 83 to the other, and can be diverted as the conveying direction of the diverting conveying section changes.

[0038] like Figure 2 As shown, the front portion of the first conveying section 81 and the second conveying section 82 are arranged side by side to form a synchronous conveying section. The fish body slot 141 and the fish head slot 211 of the synchronous conveying section correspond one-to-one. Each fish body slot 141 and each fish head slot 211 form a fish holding slot in the synchronous conveying section. The gap between the fish body slot 141 and the fish head slot 211 of the synchronous conveying section constitutes a cutting slot. The first cutter 31 is located on the upper side of the synchronous conveying section, with the lower portion of the first cutter 31 extending into the upper portion of the cutting slot. The second cutter 32 is located on the lower side of the synchronous conveying section, with the upper portion of the second cutter 32 extending into the lower portion of the cutting slot. A fish can be placed in the fish holding slot with the fish head positioned in the fish head slot and the fish body positioned in the fish body slot. When the synchronous conveying section passes by the first cutter 31, the first cutter 32 can cut the upper portion of the connection between the fish head and the fish body. When the synchronous conveying section passes by the second cutter 32, the second cutter 32 can cut the lower portion of the connection between the fish head and the fish body.

[0039] The reversing pressure plate 63 is located outside the reversing conveying section 83, covering the notch of the fish head slot 211 on the reversing conveying section 83. The reversing pressure plate 63 is also located to the side of the third cutter 33. The third cutter 33 is located between the reversing conveying section 83 and the first conveying section 81. The lower end of the third cutter 33 can extend into the gap between the fish head slot on the third conveying section and the fish body slot on the first conveying section to cut off the back of the fish where the head and body meet. The fish head slot is transported from one end of the reversing conveying section 83 to the other end, and its slot gradually rotates from upward to backward. The curved reversing pressure plate 63 can press the fish head slot, whose slot is constantly changing, to prevent the fish head from falling out of the slot.

[0040] like Figure 2 As shown, the fish body pressing plate 61 is used to press the fish body in the fish body trough. The fish body pressing plate 61 is located above the fish body trough 141 of the first conveying section 81. The front end of the fish body pressing plate 61 extends to the other side of the first cutter 31, and the rear end extends to the other side of the third cutter 33. The fish head pressing plate 62 is used to press the fish head in the fish head trough. The fish head pressing plate 62 is located above the fish head trough 211 of the second conveying section 82. The front end of the fish head pressing plate 62 extends to the side of the first cutter 31, and the rear end extends to the direction-changing pressing plate 63.

[0041] The dragging brush roller 5 is arranged in front of the first cutter 31, and the dragging brush roller 5 is rotatably arranged above the fish fixing groove of the synchronous conveying section, and is used for dragging the fish in the fish fixing groove to the fish head groove.

[0042] like Figure 6 As shown, the third cutter 33 is rotatably mounted on a cutter holder 4, which is rotatably mounted on a frame. The frame is provided with a servo motor 7 for driving the cutter holder. A torque sensor is mounted on the shaft of the servo motor 7. A PLC controller is connected to the servo motor and the torque sensor.

[0043] The method for continuously removing fish heads and internal organs comprises the following steps:

[0044] S1. In the synchronous conveying section, with the fish head facing the fish head slot 211, the fish body facing the fish body slot 141, and the fish back facing the side, the fish is placed flat in the fish fixing slot. The fish fixing slot consists of a fish head slot and a fish body slot. The fish body conveyor belt brings the fish body slot and the fish head conveyor belt brings the fish head slot to be transported backward synchronously.

[0045] S2. Before the fish enters the fish head pressure plate and the fish body pressure plate, the fish fixed tank rotates above the drag brush roller 5 to drive the fish in the fish fixed tank to move toward the fish head tank 211, and the fish head tank 211 is a trapezoidal groove that gradually shrinks outward.

[0046] S3. The fish head pressing plate 62 presses the fish head in the fish head groove 211, the fish body pressing plate 61 presses the fish body in the fish body groove 141, the first cutter 31 cuts the upper part of the connection between the fish head and the fish body, and the second cutter 32 cuts the lower part of the connection between the fish head and the fish body.

[0047] S4. The fish body conveyor belt 1 and the fish head conveyor belt 2 continue to transport the fish cut on both sides synchronously backward;

[0048] S5. The fish body conveyor belt 1 carries the fish body in the fish body groove 131 backward, and the fish head conveyor belt 2 carries the fish head groove 211 to rotate around the first center, the first center is the axis of the fourth sprocket 24, and the change-direction pressure plate 63 presses the fish head in the rotating fish head groove 211. The fish head rotates with the fish head groove 211, and the fish back position at the connection between the fish head and the fish body is turned to the third cutter 33. The third cutter 33 cuts the fish back position at the connection between the fish head and the fish body.

[0049] The controller controls the servo motor 7 to drive the blade holder 4 in forward rotation, causing the third cutter 33 on the blade holder 4 to move toward the fish and cut the fish's back at the junction of the head and body. When the controller determines that the torque value of the torque sensor on the servo motor has varied within a time period T exceeding a torque threshold, the controller controls the servo motor to stop driving the blade holder in forward rotation. Time T is the average time over which the servo motor's torque changes significantly when the third cutter cuts fish bones at the junction of the head and body, as measured multiple times. The torque threshold is the average value of the servo motor's torque changes within time period T when the third cutter cuts fish bones multiple times.

[0050] S6. After the fish bone at the connection between the fish head and the fish body is cut off, the fish head slot continues to rotate around the first center to twist the connection between the fish head and the fish body, and the fish head and the internal organs are separated from the fish body. The fish head slot continues to rotate and disengages from the deflection pressure plate, and the fish head in the fish head slot is removed from the fish head slot. Figure 5 As shown, after the fish head trough is separated from the changing pressure plate, the ejecting teeth 91 of the ejecting wheel 9 extend into the fish head trough 211. The ejecting wheel can be rotatably arranged on the side of the fish head conveyor belt. A circle of ejecting teeth is provided on the outer periphery of the ejecting wheel. When the ejecting wheel is rotated, the ejecting teeth 91 can extend into the fish head trough.

[0051] S7. The fish head conveyor belt transports the fish head trough for discharging the fish heads to the synchronous conveying section; the fish body trough rotates around the second center to pour out the fish body, and the second center is the rotation center of the second sprocket; the fish body conveyor belt transports the fish body trough for discharging the fish bodies to the synchronous conveying section and enters the next cycle.

[0052] The above description is only a preferred embodiment of the present invention and does not limit the scope of implementation of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should still fall within the scope of the present invention.

Claims

1. A method for continuously removing fish head viscera, characterized in that: Removing the head and viscera of a fish using a fish head and viscera remover involves the following steps: In the synchronous conveying section, the fish is placed flat into the fish fixing trough with the fish head facing the fish head trough, the fish body facing the fish body trough, and the fish back facing the side. The fish fixing trough consists of a fish head trough and a fish body trough. The fish body conveyor belt carries the fish body trough and the fish head conveyor belt carries the fish head trough to convey synchronously backwards. The drag brush roller rotating above the fish fixing tank drives the fish to move towards the fish head tank, which is a trapezoidal tank that gradually shrinks outwards. The fish head pressing plate presses the fish head in the fish head slot, the fish body pressing plate presses the fish body in the fish body slot, the first cutter cuts the upper part of the connection between the fish head and the fish body, and the second cutter cuts the lower part of the connection between the fish head and the fish body. The fish body conveyor belt carries the fish body in the fish body trough backward, and the fish head conveyor belt rotates the fish head trough around the first center. The direction-changing pressure plate presses the fish head in the rotating fish head trough, and the fish head rotates with the fish head trough, and the fish back position at the connection between the fish head and the fish body is turned to the third cutter. The controller controls the servo motor to drive the knife holder to rotate forward, so that the third cutter on the knife holder moves toward the fish and cuts the fish back position at the connection between the fish head and the fish body; when the controller determines that the torque value of the torque sensor on the servo motor exceeds the torque threshold within the T time, the controller controls the servo motor to stop driving the knife holder to rotate forward; the third cutter is rotatably set on the knife holder, and the knife holder is rotatably set on the frame. The frame is provided with a servo motor for driving the knife holder to rotate, and the rotating shaft of the servo motor is provided with a torque sensor; The fish head slot continues to rotate to break the connection between the fish head and the fish body, and the fish head and internal organs are separated from the fish body. The fish head trough continues to rotate and disengages from the reversing pressure plate, and the ejecting teeth of the ejecting wheel extend into the fish head trough, and the fish heads in the fish head trough escape from the trough. The fish head conveyor belt transports the discharged fish head trough to the synchronous conveying section; the ejecting wheel is rotatably arranged on the side of the fish head conveyor belt, and a circle of ejecting teeth is provided on the outer circumference of the ejecting wheel. When the ejecting wheel is rotated, the ejecting teeth can extend into the fish head trough; The fish body trough rotates around the second center to pour out the fish body, and the fish body conveyor belt conveys the fish out of the fish body trough to the synchronous conveying section.

2. A method for continuously removing fish head viscera according to claim 1, characterized in that: The fish head and viscera removal machine comprises a fish body conveyor belt, a fish head conveyor belt, a first cutter, a second cutter, a third cutter, and a direction-changing pressure plate; The fish body conveyor belt is provided with a fish body trough, and the fish head conveyor belt is provided with a fish head trough; the fish body conveyor belt includes a first conveying section, and the fish head conveyor belt includes a second conveying section and a direction-changing conveying section. Both the first conveying section and the second conveying section convey horizontally backward, and the direction-changing conveying section is provided at the rear end of the second conveying section. The conveying direction of the direction-changing conveying section is different from that of the first conveying section. The fish head trough conveys from one end of the direction-changing conveying section to the other end and can turn as the conveying direction of the direction-changing conveying section changes; The front portion of the first conveying section and the second conveying section are arranged side by side to form a synchronous conveying section. The fish body slots and the fish head slots of the synchronous conveying section correspond to each other one by one. One fish body slot and one fish head slot form a fish fixing slot in the synchronous conveying section. The gap between the fish body slot and the fish head slot constitutes a cutting slot. The first cutting knife is arranged on the upper side of the synchronous conveying section, and the lower part of the first cutting knife extends into the upper part of the cutting slot. The second cutting knife is arranged on the lower side of the synchronous conveying section, and the upper part of the second cutting knife extends into the lower part of the cutting slot. The direction-changing pressure plate is arranged on the outside of the direction-changing conveying section and is used to cover the notch of the fish head slot on the direction-changing conveying section; The third cutter is arranged between the direction-changing conveying section and the first conveying section, and the lower end of the third cutter can extend into the gap between the fish head groove and the fish body groove.

3. The method for continuously removing fish heads and internal organs according to claim 2, characterized in that: The fish body conveyor belt includes a first chain, a first sprocket, a second sprocket, and a first chain plate. The second sprocket is arranged behind the first sprocket. The first chain is annular and is wound around the first and second sprockets. The upper portion of the first chain between the first and second sprockets constitutes a first conveying section. The first chain is filled with first chain plates along the length direction, and each first chain plate is provided with a fish body groove. The second center is the rotation center of the second sprocket. The fish head conveyor belt includes a second chain, a third sprocket, a fourth sprocket, a fifth sprocket, and a second chain plate; the fourth sprocket is located behind the third sprocket, and the fifth sprocket is located below and in front of the fourth sprocket. The second chain is annular and is simultaneously wound around the third sprocket, the fourth sprocket, and the fifth sprocket. The part of the second chain between the third sprocket and the fourth sprocket constitutes a second conveying section, and the part of the second chain wound around the fourth sprocket constitutes a changing conveying section. The second chain is filled with second chain plates along the length direction; each second chain plate is provided with a fish head groove; the first center is the rotation center of the fourth sprocket.

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