Fin cut-off machine with controllable cut-off position and positioning cut-off device of fin cut-off machine

Abstract

The utility model provides a fin cut-off machine with a controllable cut-off position and a positioning cut-off device of the fin cut-off machine, and the fin cut-off machine comprises a machine frame assembly, a fin pushing mechanism and a fin positioning cut-off device, the fin positioning and cutting device comprises a positioning knife, an upper cutting knife, a lower cutting knife, a positioning driving system and a cutting driving system, and the positioning knife and the upper cutting knife are adjacently mounted on the rack assembly and independently move up and down through the positioning driving system and the cutting driving system respectively; the lower cutting knife is installed on the machine frame assembly, located below the upper cutting knife, matched with the upper cutting knife and used for cutting off the fins at the preset position under the positioning effect of the positioning knife, so that the fins can reserve the preset edge reserving size, and more requirements are met.

Description

Technical Field

[0001] The utility model relates to fin cutting equipment, in particular to a fin cutting machine with controllable cutting position and a positioning cutting device thereof. Background Art

[0002] Aluminum fins are often used as heat sinks in various devices that require heat exchange or heat dissipation, such as automobile aluminum water tank radiators, parallel flow condensers, parallel flow evaporators, refrigerators or air conditioners, etc. Radiators, variable air volume air conditioning cabinets, fan coils and heat exchangers and other equipment components, and their main function is to perform heat exchange. The fins after industrial production are very long fin strips. In order to meet the needs of use, the fins need to be cut into the required length. In this industry, how to cut fins efficiently and accurately has become a difficult problem in this industry. The existing patents have gradually solved the problems of fin cutting efficiency and how to reduce scrap rates.

[0003] At present, although the problems faced by fin cutting are gradually being overcome, in the actual application of fins, the required margin size of the fin edge is different, and the fins cut by current equipment still cannot meet all requirements. This is because the cutting tool has a certain thickness, and different fins have different pitches. If the pitch is small, the cutting will be close to the edge of the fin body. If the pitch is large, the cutting position is more random, and the fin is soft and will shake during the cutting process. This results in the margin size of the cut fins being not fixed and cannot meet the actual application requirements.

[0004] Therefore, how to better control the margin size of the fins so that the cut fins have a margin size that can meet the requirements, and then the fins can be better used in the heat exchangers of various products, is a difficult problem that the industry urgently needs to solve. Utility Model Content

[0005] One advantage of the utility model is that it provides a fin cutting machine with controllable cutting position and a positioning cutting device thereof, which can not only cut the fins, but also accurately control the margin size of the fins, so that the cut fins can meet more usage requirements.

[0006] Another advantage of the utility model is that it provides a fin cutting machine with controllable cutting position and a positioning and cutting device thereof, which adopts different drive systems to control the positioning knife and the cutting knife to move up and down independently of each other, first positioning and then cutting, positioning according to needs, and then cutting out ideal fins.

[0007] Another advantage of the utility model is that it provides a fin cutting machine with controllable cutting position and a positioning cutting device thereof, and the margin sizes of different fins can be controlled by replacing positioning knives of different thicknesses, and the positioning knives are easy to replace.

[0008] Another advantage of the utility model is that it provides a fin cutting machine with controllable cutting position and a positioning cutting device thereof, which can accurately transmit the required fin pitch to the required cutting position by controlling the feeding process, and then cooperate with a positioning knife of predetermined thickness to accurately adjust the cutting position.

[0009] Another advantage of the utility model is that it provides a fin cutting machine with controllable cutting position and a positioning and cutting device thereof, which is simple to operate and easy to use, and can efficiently and accurately adjust the cutting position of the fin.

[0010] According to one aspect of the utility model, the utility model provides a fin cutting machine with controllable cutting position, comprising:

[0011] a rack assembly;

[0012] a fin advancing mechanism, the fin advancing mechanism being mounted on the frame assembly and being adapted to drive the fins to move and convey the fins to a cutting position; and

[0013] A fin positioning and cutting device, the fin positioning and cutting device comprises a positioning knife, an upper cutting knife, a lower cutting knife, a positioning drive system and a cutting drive system. The positioning knife is installed on the frame assembly adjacent to the upper cutting knife, and moves up and down independently through the positioning drive system and the cutting drive system respectively. The lower cutting knife is installed on the frame assembly and is located below the upper cutting knife. It cooperates with the upper cutting knife to cut the fin at a predetermined position when the positioning of the positioning knife and the pushing of the fin by the fin propulsion mechanism cooperate.

[0014] The fin propulsion mechanism comprises a support plate, a roller gear assembly, a first motor mounting seat and a first servo motor system, wherein the support plate is connected to the frame assembly, the roller gear assembly is arranged above the frame assembly, and a moving space is formed between the roller gear assembly and the support plate for the fins to pass through, wherein the first motor mounting seat is fixed to the frame assembly, and the first servo motor system is installed on the first motor mounting seat to drive the fins to move; the frame assembly comprises a bracket, a mounting platform, a roller mounting frame and a feed roller, the bracket is arranged at the lower part of the mounting platform, the roller mounting frame is installed on the rear side of the bracket, and the feed roller is installed on the roller mounting frame.

[0015] The fin positioning and cutting device further includes an upper cutting knife installation assembly, which includes an upper knife support plate, two upper knife pull plates, an upper knife seat, two limit rods and two box-type linear bearings. The upper knife support plate and the limit rods are both arranged below the bracket, and the box-type linear bearings are fixed on the back side of the upper knife support plate. The box-type linear bearings can slide up and down and are sleeved on the limit rods to guide the upper knife support plate to move up and down. The two upper knife pull plates are installed on the upper knife support plate at intervals, and the upper knife seat is fixed on the upper knife pull plate, and the upper cutting knife is installed on the upper knife seat.

[0016] The cutting drive system includes a second motor mounting seat, a second servo motor, an eccentric shaft seat, an eccentric shaft, a rocker arm and a support seat. The second motor mounting seat is arranged on the lower end surface of the mounting platform. The second servo motor and the eccentric shaft seat are both installed on the second motor mounting seat. The rocker arm can be rotatably mounted on the eccentric shaft and is further connected to the support seat. The support seat is fixed to the upper knife support plate.

[0017] The positioning and cutting device further includes a positioning knife mounting assembly, which includes a positioning knife ear seat, a left limit plate, a right limit plate, a middle limit plate and a middle limit seat, wherein the left limit plate and the right limit plate are arranged at the left and right ends of the positioning knife to limit the left and right movement of the positioning knife, the middle limit seat is connected to the frame assembly, the middle limit plate is connected to the middle limit seat, the positioning knife ear seat is movably connected to the middle limit plate, and the positioning knife is detachably connected to the positioning knife ear seat.

[0018] The positioning drive system includes a cylinder seat, a cylinder and multiple connecting components. The cylinder seat is fixed to the frame component, the cylinder is installed on the cylinder seat through the connecting component, and the cylinder seat is connected to the positioning knife ear seat through another connecting component to drive the positioning knife to move up and down.

[0019] According to another aspect of the utility model, the utility model also provides a fin positioning and cutting device, including a positioning knife, an upper cutting knife, a lower cutting knife, a positioning drive system and a cutting drive system. The positioning knife is installed on the frame assembly adjacent to the upper cutting knife, and moves up and down independently through the positioning drive system and the cutting drive system respectively. The lower cutting knife is installed on a frame assembly and is located below the upper cutting knife. It cooperates with the upper cutting knife and cuts the fin at a predetermined position of a fin pitch under the positioning action of the positioning knife to form a preset margin size.

[0020] The positioning and cutting device further includes a positioning knife mounting assembly, which includes a positioning knife ear seat, a left limit plate, a right limit plate, a middle limit plate and a middle limit seat, wherein the left limit plate and the right limit plate are arranged at the left and right ends of the positioning knife to limit the left and right movement of the positioning knife, the middle limit seat is connected to the frame assembly, the middle limit plate is connected to the middle limit seat, the positioning knife ear seat is movably connected to the middle limit plate, and the positioning knife is detachably connected to the positioning knife ear seat.

[0021] The positioning drive system includes a cylinder seat, a cylinder and multiple connecting components. The cylinder seat is fixed to the frame component, the cylinder is installed on the cylinder seat through the connecting component, and the cylinder seat is connected to the positioning knife ear seat through another connecting component to drive the positioning knife to move up and down.

[0022] The fin positioning and cutting device further includes an upper cutting knife mounting assembly, the upper cutting knife mounting assembly includes an upper knife support plate, two upper knife pull plates, an upper knife seat, two limit rods and two box-type linear bearings, the upper knife support plate and the limit rods are both arranged below the bracket, the box-type linear bearing is fixed on the back side of the upper knife support plate, the box-type linear bearing can be slid up and down and sleeved on the limit rod to guide the upper knife support plate to move up and down, the two upper knife pull plates are installed on the upper knife support plate at intervals, the upper knife seat is fixed on the upper knife pull plate, the upper cutting knife is installed on the upper knife seat, the cutting drive system is a servo drive system, after the positioning knife is positioned, the upper cutting knife moves downward and cooperates with the lower cutting knife to cut the fin to form the fin with a preset margin size, and the margin size is controlled by replacing the positioning knife and adjusting and controlling the process of the fin moving forward. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front view of a cutting machine with controllable cutting position according to a preferred embodiment of the utility model.

[0024] Figure 2 It is a side view of the cutting machine with controllable cutting position according to the above preferred embodiment of the utility model.

[0025] Figure 3 It is a top view of the cutting machine with controllable cutting position according to the above preferred embodiment of the utility model.

[0026] Figure 4 It is a partial cross-sectional view of the positioning and cutting device of the cutting machine with controllable cutting position according to the above preferred embodiment of the utility model.

[0027] Figure 5 It is an enlarged view of the positioning and cutting device of the cutting machine with controllable pressing and cutting position according to the above preferred embodiment of the utility model.

[0028] Figure 6 It is a process diagram of cutting fins by the cutting machine with controllable cutting position according to the above preferred embodiment of the utility model.

[0029] Figure 7 It is a schematic diagram of the trimming process of the fins by the cutting machine with controllable cutting position according to the above preferred embodiment of the utility model.

[0030] Figure 8 It is another schematic diagram of trimming fins by the cutting machine with controllable cutting position according to the above preferred embodiment of the utility model. DETAILED DESCRIPTION

[0031] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0032] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0033] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0034] Reference Figure 1 To Attachment Figure 6 As shown, a fin cutting machine with controllable cutting position and a positioning and cutting device thereof according to a preferred embodiment of the utility model are schematically illustrated.

[0035] In this embodiment, the fin cutting machine with controllable cutting position includes a frame assembly 10, a fin propulsion mechanism 20 and a fin positioning and cutting device 30, wherein the fin propulsion mechanism 20 and the fin positioning and cutting device 30 are both arranged on the frame part 10, and the fin 40 is fed according to a predetermined feeding process through the fin propulsion mechanism 20, and then is cut by the fin positioning and cutting device 30 at a preset cutting position, thereby retaining a predetermined margin size so that the fin can meet more usage requirements.

[0036] The frame assembly 10 includes a bracket 11, a mounting platform 12, a roller mounting frame 13, and a feed roller 14. The mounting platform 12 is arranged on the upper part of the bracket 11, the roller mounting frame 13 is installed on the rear side of the bracket 11, and the feed roller 14 is installed on the roller mounting frame 13 to support and transport the fin to the cutting position.

[0037] The fin propulsion mechanism 20 includes a support plate 21, a rolling gear assembly 22 and a moving space 23. The support plate 21 is mounted on the mounting platform 12. The rolling gear assembly 22 is disposed above the support plate 21. The moving space 23 is located between the support plate 21 and the rolling gear assembly 22 for the fin 40 to pass through. The rolling gear assembly can rotate around its own axis to facilitate pushing the fin 40. The external gear teeth of the rolling gear assembly 22 can mesh with the pitch portion 42 of the fin 40 located on the support plate 21. In this way, under the action of the driving mechanism, the rotation of the rolling gear assembly 22 can continuously pass over the fin body 41 of the fin 40, driving the fin 40 to move forward, and the rotation of the rolling gear assembly 22 can be changed according to the cutting position to accurately control the feeding process of the fin 40 and cut at the precise pitch portion 42.

[0038] The fin propulsion mechanism 20 further includes a first motor mounting seat 24 and a first servo motor system 25. The first motor mounting seat 24 is mounted on the lower part of the mounting platform 12, and the first servo motor system 25 is mounted on the first motor mounting seat 24. The first servo motor system 25 includes a first servo motor 251, a driving pulley 252, and a conveyor belt 253. The first servo motor 251 is connected to the driving pulley 252 through a reducer, and the reducer is used to reduce the rotation of the servo motor and increase the torque. The driving pulley 252 is connected to the roller gear assembly 22 through the conveyor belt 253.

[0039] The two ends of the rotating shaft of the rolling gear assembly 22 are mounted on rotating plates located on the left and right sides above the mounting platform 12 through bearings, and the rotating plates are suitable for being fixed on the mounting platform 12 through bolts.

[0040] The fin positioning and cutting device 30 includes a positioning knife 31, an upper cutting knife 32, a positioning drive system 33 and a cutting drive system 34, wherein the positioning drive system 33 is used to drive the positioning knife 31, and the cutting drive system 34 is used to drive the cutting knife 32, so that the positioning knife 31 and the upper cutting knife 32 move independently of each other.

[0041] The fin positioning and cutting device 30 also includes a positioning knife mounting assembly 35 and an upper cutting knife mounting assembly 36, wherein the positioning knife 31 is detachably mounted on the frame assembly 10 through the positioning knife mounting assembly 35, and the upper cutting knife 32 is detachably mounted on the frame assembly 10 through the upper cutting knife mounting assembly 36, wherein the positioning knife 31 and the upper cutting knife 32 are installed adjacent to each other, and the positioning knife 31 and the upper cutting knife 32 move independently of each other, that is, the positioning knife 31 and the upper cutting knife 32 can move simultaneously or successively, so that the user can make adjustments according to actual needs.

[0042] The fin positioning and cutting device 30 further includes a lower cutting knife 37 and a lower cutting knife mounting assembly 38, and the lower cutting knife 37 is mounted on the frame assembly 10 through the lower cutting knife mounting assembly 38. Under the positioning action of the positioning knife 31, the lower cutting knife 37 cooperates with the upper cutting knife 32 to cut the fin 40 at the position where the positioning knife 31 is positioned, so as to control the predetermined margin size.

[0043] The positioning drive system 33 includes a cylinder seat 331, a cylinder 332, and multiple connecting components 333. The connecting components can be implemented as round nuts, connecting screws and washers, etc., wherein the cylinder seat 331 is fixed to the bracket 11, and the cylinder 332 is installed on the cylinder seat 331 through the connecting component 333. The cylinder 332 is used to drive the positioning knife 31 to move up and down.

[0044] That is to say, in this embodiment, the positioning knife 31 is driven by a cylinder drive system, and the upper cutting knife 32 is moved by a servo drive system. Those skilled in the art can understand that, under the conception of the present application, the positioning knife 31 can also adopt a servo drive system, and the positioning knife 31 can also be positioned and cut in a manner of linkage with the upper cutting knife 32.

[0045] The positioning knife installation assembly 35 includes a positioning knife ear seat 351, a left limit plate 352, a right limit plate 353, a middle limit plate 354, a middle limit seat 355, a plurality of mounting screws 356 and a plurality of washers 357. The positioning knife 31 is detachably mounted on the positioning knife ear seat 351. The left limit plate 352 and the right limit plate 353 are respectively arranged at the left and right ends of the positioning knife 31 to restrict the left and right movement of the positioning knife 31. The right limit plate 353 is further connected to the bracket 11, the middle limit seat 355 is connected to the bracket 11 and the middle limit plate 354, the middle limit plate 354 is further connected to the positioning knife ear seat 351, and the cylinder 332 is connected to the positioning knife ear seat 351, and then the positioning knife ear seat 351 is driven up and down by starting the cylinder 332 to drive the positioning knife 31 to move down for positioning, and further move up after cutting to transport the fin 40 for the next positioning and cutting.

[0046] The cutting drive system 34 includes a second motor mounting seat 341, a second servo motor 342, an eccentric shaft seat 343, an eccentric shaft 344, a rocker arm 345, a swivel pin 346 and a support 347. The motor mounting seat 341 is mounted on the lower end surface of the mounting platform 12. The second servo motor 342 and the eccentric shaft seat 343 are both mounted on the motor mounting seat 341. The lower end of the rocker arm 345 is rotatably mounted on the eccentric shaft 344 through a bearing, and the upper end of the rocker arm 345 is rotatably connected to the support 347 through the swivel pin 346.

[0047] The upper cutting knife installation assembly 36 includes an upper knife support plate 361, two upper knife pull plates 362, an upper knife seat 363, two limit rods 364 and two box-type linear bearings 365, wherein the upper knife support plate 361 is located below the bracket 11, the support 347 is fixed to the upper knife support plate 361, the two limit rods 364 are parallel and spaced apart and vertically arranged below the frame 11, and the back side of the upper knife support plate 361 is fixed with the box-type linear bearings 365 at intervals. The box-type linear bearings 365 are mounted on the limit rods 364 and can slide up and down to provide a guiding effect on the movement of the upper knife support plate 361, so as to constrain the upper knife support plate 361 to move only up and down.

[0048] The two upper knife pull plates 362 are fixed at intervals on both sides of the upper knife support plate 361 , the upper knife seat 363 is fixed to the two upper knife pull plates 362 , and the upper cutting knife 32 is installed on the upper knife seat 363 .

[0049] The lower cutting knife mounting assembly 38 is fixed to the mounting platform 12, the lower cutting knife 37 is mounted on the lower cutting knife mounting assembly 38, and the lower cutting knife 37 is suitable for being adjusted to be located directly below the upper cutting knife 32. The upper cutting knife 32 moves up and down under the drive of the cutting drive system 34 to cooperate with the lower cutting knife 37 to cut off the fins.

[0050] The lower cutting blade installation assembly 38 includes a positioning screw 381, two adjustment seats 382 and two adjustment screws 383, wherein the positioning screw 381 matches a mounting hole of the lower cutting blade 37, and the positioning screw 381 passes through the mounting hole and is threadedly connected to the mounting platform 12, and the size of the positioning screw 381 is smaller than the aperture of the mounting hole, so the positioning screw 381 can slide forward and backward. The adjustment seat 382 is fixed to the mounting platform 12, and the adjustment seat 382 is located on the left and right sides behind the lower cutting blade 37, and is threadedly connected to the adjustment screw 383, that is, the screw of the adjustment screw 37 passes through the adjustment seat 382 and abuts against the rear end surface of the lower cutting blade 37.

[0051] It is worth mentioning that the positioning knife 31 is detachably connected to the positioning knife ear seat 351, so that the positioning knife 31 can be replaced. In actual application, due to different application environments, different margin sizes are required, and the positioning knife 31 and the upper cutting knife 32 both have a certain thickness. In the process of cutting the fins at the corresponding pitch, the positioning knife 31 can be used for positioning first, and then the upper cutting knife 32 moves downward along the edge of the positioning knife 31 to cooperate with the lower cutting knife 37 to cut the fin 40. Under the action of the positioning knife 31, the predetermined margin size can be retained. However, due to different fin application products, the requirements for the margin size are also different. At this time, it is necessary to replace the positioning knife 31 of different thicknesses. According to the requirements of the margin size, it is replaced with a positioning knife with a larger thickness or a positioning knife with a smaller thickness. The positioning knives of different thicknesses can change the positioning position, thereby adjusting and controlling the margin size.

[0052] In addition, since the pitches of different fins are different, the positioning position is controlled by controlling the feeding process of the fin propulsion mechanism 20 and using the positioning knives 31 of different thicknesses, and the upper cutting knife 32 is cut in accordance with the positioning position of the positioning knife 31. Therefore, the margin size of any fin of any pitch can be controlled, so that the fins can meet more requirements.

[0053] The working process of the cutting machine with controllable cutting position is as follows:

[0054] The fin propulsion mechanism 20 is used to feed the material, and a servo drive system is used to accurately control the feeding process. When the fin 40 is fed to a predetermined position, the positioning drive system 33 is started and controlled to drive the positioning knife 31 of a predetermined thickness to move downward to the pitch 42 of the fin 40, and then the cutting drive system 34 is started and controlled to drive the upper cutting knife 32 to move downward along the positioning knife 31 to the pitch 42, and cooperate with the lower cutting knife 37 to cut the fin at the positioning knife 31.

[0055] In this embodiment, when the fins are cut by the cutting machine of the utility model, the fins need to be trimmed after cutting. That is to say, in order to ensure that the margin size at both ends of the fins meets the requirements, trimming needs to be performed after each fin is cut. Figure 7 and attached Figure 8 shown.

[0056] In the attached Figure 7 In the process, a normal cutting position 45 is determined with reference to the above method for normal cutting. Under the drive of the positioning drive system 33, the positioning knife 31 is positioned. Under the drive of the cutting drive system 34, the upper cutting knife 32 moves downward and cooperates with the lower cutting knife 37 to cut the fin. However, since the fin is relatively long, in order to make the fins cut subsequently meet the margin requirement, a trimming position 46 is selected at the same pitch 42 for trimming according to the requirement, that is, by controlling the feeding process of the fin propulsion mechanism 20, the fin is positioned and cut twice, and the fins between the two cutting positions are used as fin waste 44, thereby obtaining the margin size 43 with a predetermined size on both sides.

[0057] Reference Figure 8 As shown, after normal cutting, in order to obtain fins that meet the requirements, trimming is required. Trimming can be performed at other pitches 42 according to actual needs. The fins between normal cutting and trimming are used as fin waste 44. Fins with predetermined margin sizes 43 at both ends can also be obtained.

[0058] Therefore, this embodiment performs positioning and cutting through the independent movements of the positioning knife 31 and the upper cutting knife 32, and can accurately control the feeding process by replacing positioning knives of different thicknesses and through the fin propulsion mechanism 20, so that the size of the margin size 43 can be accurately controlled to meet the actual application requirements, and the same or different margin sizes can be cut on both sides of a fin product.

[0059] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A fin cutting machine, characterized in that: include: a rack assembly; a fin propulsion mechanism, the fin propulsion mechanism being mounted on the frame assembly and being adapted to drive the fins to move and transport the fins to a cutting position; and A fin positioning and cutting device, the fin positioning and cutting device comprises a positioning knife, an upper cutting knife, a lower cutting knife, a positioning drive system and a cutting drive system, the positioning knife is installed on the frame assembly adjacent to the upper cutting knife, and moves up and down independently through the positioning drive system and the cutting drive system respectively, the lower cutting knife is installed on the frame assembly and is located below the upper cutting knife, cooperates with the upper cutting knife, and cuts the fin at a predetermined position under the positioning of the positioning knife and the pushing of the fin by the fin propulsion mechanism.

2. The fin cutting machine according to claim 1, wherein the fin propulsion mechanism comprises a support plate, a rolling gear assembly, a first motor mounting seat and a first servo motor system, wherein the support plate is connected to the frame assembly, the rolling gear assembly is arranged above the frame assembly, and a moving space is formed between the support plate for the fin to pass through, wherein the first motor mounting seat is fixed to the frame assembly, and the first servo motor system is installed on the first motor mounting seat to drive the fin to move; the frame assembly comprises a bracket, a mounting platform, a roller mounting frame and a feeding roller, the bracket is arranged at the lower part of the mounting platform, the roller mounting frame is installed on the rear side of the bracket, and the feeding roller is installed on the roller mounting frame.

3. The fin cutting machine according to claim 2, wherein the fin positioning and cutting device further includes an upper cutting knife mounting assembly, the upper cutting knife mounting assembly includes an upper cutting knife support plate, two upper cutting knife pull plates, an upper cutting knife seat, two limiting rods and two box-type linear bearings, the upper cutting knife support plate and the limiting rods are both arranged under the bracket, the box-type linear bearing is fixed on the back side of the upper cutting knife support plate, the box-type linear bearing can slide up and down and is sleeved on the limiting rod to guide the upper cutting knife support plate to move up and down, the two upper cutting knife pull plates are installed on the upper cutting knife support plate at intervals, the upper cutting knife seat is fixed on the upper cutting knife pull plate, and the upper cutting knife is installed on the upper cutting knife seat.

4. The fin cutting machine according to claim 3, wherein the cutting drive system comprises a second motor mounting seat, a second servo motor, an eccentric shaft seat, an eccentric shaft, a rocker arm and a support seat, the second motor mounting seat is arranged on the lower end surface of the mounting platform, the second servo motor and the eccentric shaft seat are both installed on the second motor mounting seat, the rocker arm is rotatably mounted on the eccentric shaft and is further connected to the support seat, and the support seat is fixed to the upper knife support plate.

5. The fin cutting machine according to any one of claims 1 to 4, wherein the positioning and cutting device further comprises a positioning knife mounting assembly, the positioning knife mounting assembly comprises a positioning knife ear seat, a left limit plate, a right limit plate, a middle limit plate and a middle limit seat, the left limit plate and the right limit plate are arranged at the left and right ends of the positioning knife to limit the left and right movement of the positioning knife, the middle limit seat is connected to the frame assembly, the middle limit plate is connected to the middle limit seat, the positioning knife ear seat is movably connected to the middle limit plate, and the positioning knife is detachably connected to the positioning knife ear seat.

6. The fin cutting machine according to claim 5, wherein the positioning drive system comprises a cylinder seat, a cylinder and a plurality of connecting components, the cylinder seat is fixed to the frame component, the cylinder is installed on the cylinder seat through the connecting component, and the cylinder seat is connected to the positioning knife ear seat through another connecting component to drive the positioning knife to move up and down.

7. A fin positioning and cutting device, characterized in that: The fin positioning and cutting device includes a positioning knife, an upper cutting knife, a lower cutting knife, a positioning drive system and a cutting drive system. The positioning knife is installed on a frame assembly adjacent to the upper cutting knife, and moves up and down independently through the positioning drive system and the cutting drive system respectively. The lower cutting knife is installed on a frame assembly and is located below the upper cutting knife. It cooperates with the upper cutting knife and cuts the fin at a predetermined position of a fin pitch under the positioning action of the positioning knife to form a preset margin size.

8. The fin positioning and cutting device according to claim 7, wherein the positioning and cutting device further comprises a positioning knife mounting assembly, the positioning knife mounting assembly comprises a positioning knife ear seat, a left limit plate, a right limit plate, a middle limit plate and a middle limit seat, the left limit plate and the right limit plate are arranged at the left and right ends of the positioning knife to limit the left and right movement of the positioning knife, the middle limit seat is connected to the frame assembly, the middle limit plate is connected to the middle limit seat, the positioning knife ear seat is movably connected to the middle limit plate, and the positioning knife is detachably connected to the positioning knife ear seat.

9. The fin positioning and cutting device according to claim 8, wherein the positioning drive system comprises a cylinder seat, a cylinder and a plurality of connecting components, the cylinder seat is fixed to the frame component, the cylinder is installed on the cylinder seat through the connecting component, and the cylinder seat is connected to the positioning knife ear seat through another connecting component to drive the positioning knife to move up and down.

10. The fin positioning and cutting device according to any one of claims 7 to 9, wherein the fin positioning and cutting device further comprises an upper cutting knife mounting assembly, the upper cutting knife mounting assembly comprises an upper cutting knife support plate, two upper cutting knife pull plates, an upper cutting knife seat, two limiting rods and two box-type linear bearings, the upper cutting knife support plate and the limiting rods are both arranged under a bracket included in the frame assembly, the box-type linear bearing is fixed on the back side of the upper cutting knife support plate, the box-type linear bearing can be slidably sleeved on the limiting rod to guide the upper cutting knife support plate to move up and down, the two upper cutting knife pull plates are installed on the upper cutting knife support plate at intervals, the upper cutting knife seat is fixed on the upper cutting knife pull plate, the upper cutting knife is installed on the upper cutting knife seat, the cutting drive system is a servo drive system, after the positioning knife is positioned, the upper cutting knife moves downward and cooperates with the lower cutting knife to cut the fin to form the fin with a preset margin size, and the margin size is controlled by replacing the positioning knife and adjusting and controlling the process of the fin moving forward.

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