Circular die cutting and nesting material saving device for U-shaped products

Abstract

The invention discloses a circular knife die-cutting and nesting material-saving device for U-shaped products. The device comprises a main circular knife machine, wherein the main circular knife of the main circular knife machine is a regular U-shaped wire knife with an opening facing upward in a circumferential array, and the inner straight upper ends of adjacent regular U-shaped wire knives are connected by arc lines to form an inverted U-shaped wire knife with an opening facing downward. The main film enters the main circular knife for processing into a first half film and a second half film, and the first half film is separated by a first steel roller and rotated to the lower end to move backward. A plurality of inverted U-shaped holes with openings facing downward are evenly distributed on the first half film, and an auxiliary film is attached to the lower surface of the first half film to become a first semi-finished product. The second half film moves forward, and a plurality of regular U-shaped holes with openings facing upward are evenly distributed on the second half film, and another auxiliary film is attached to the lower surface of the second half film to become a second semi-finished product. The invention has the effects of high utilization rate of the main film, cost saving, high yield rate, and high production speed.

Description

Technical Field

[0001] The invention relates to the field of circular knife processing, in particular to a circular knife die-cutting nesting and material-saving device for U-shaped products. Background Art

[0002] 3C products involve a large number of thin, small and special-shaped parts, such as a large number of U-shaped products. In order to improve the processing speed of parts, the whole laying process of rolling material collection and release and two or three die-cutting processing is often used. After processing, a large amount of continuous roll-shaped residual waste is generated. Especially for the main materials with higher value, there is currently a process of continuous hole punching. Its defects are: the remaining material is set in a roll, the flatness and straightness of the material are greatly reduced, and it is difficult to ensure the contour and position of the product during material processing, which is easy to cause the product to be short of material. Moreover, when it is compounded again, it is difficult to compound and position due to the deformation of the material, and the product yield rate is low. There is also the use of manual processing of residual materials, but the production efficiency is low and the product quality is difficult to control. At the same time, in order to improve the product yield rate and reduce the phenomenon of product short of material, the above two methods will leave more processing allowances, resulting in lower utilization of the main material, which greatly increases the product cost. Summary of the invention

[0003] In order to solve one or more of the above problems, the present invention provides a circular knife die-cutting nesting and material-saving device for U-shaped products.

[0004] According to one aspect of the present invention, the circular knife die cutting nesting and material saving device for U-shaped products comprises a frame, the upper end of the outer side surface of the frame is vertically installed with a first feeding assembly, a first receiving assembly and a second feeding assembly in sequence from the middle to the right, and the lower end of the outer side surface of the frame is vertically installed with a third feeding assembly and a second receiving assembly in sequence from the left to the middle.

[0005] The middle of the outer side of the frame is vertically connected to the base plate, and the upper surface of the base plate is installed with the laminating machine and the main circular knife machine from the left end to the right end.

[0006] The main circular knife machine includes a main knife roller, a first steel roller and a first base roller arranged in sequence from top to bottom. A main circular knife is provided in the middle of the main knife roller. The main circular knife is a circular array of positive U-shaped wire knives with an opening facing upward. The upper ends of the inner straight lines of adjacent positive U-shaped wire knives are connected by arc lines to form an inverted U-shaped wire knife with an opening facing downward.

[0007] The main film is rolled and placed on the first unwinding assembly. The main film enters the main circular knife and is processed into the first half film and the second half film. The first half film is separated by the first steel roller and rotates to the lower end and moves backward. A number of inverted U-shaped holes with openings facing downward are evenly distributed on the first half film. The second half film moves forward and turns to the second steel roller through the middle rubber roller of the laminating machine. A number of positive U-shaped holes with openings facing upward are evenly distributed on the second half film.

[0008] An auxiliary film is rolled and placed on the second unwinding assembly and enters the lower end of the first base roller. The first base roller rotates to make the auxiliary film adhere to the lower surface of the first half film to become a first semi-finished product. The first semi-finished product is rolled and collected by the first receiving assembly.

[0009] Another auxiliary film is rolled and placed on the third unwinding assembly, enters the second steel roller, and adheres to the lower surface of the second half film to become a second semi-finished product, which is collected in a roll by the second receiving assembly.

[0010] In some embodiments, a plurality of main circular knives are equidistantly distributed in the middle of the main knife roller along the axial direction, and a first straight line cutter is respectively provided on the center line of adjacent main circular knives.

[0011] In some embodiments, the opening lengths between the positive U-shaped wire cutter and the inverted U-shaped wire cutter are the same.

[0012] In some embodiments, a left circular knife machine is provided at the left end of the laminating machine, and a right circular knife machine is provided at the right end of the main circular knife machine.

[0013] The left circular knife machine includes a third retaining frame, an auxiliary knife roller is installed on the upper end of the third retaining frame and a third steel roller is installed on the lower end.

[0014] The right circular knife machine includes a fourth cage, an auxiliary knife roller is installed at the lower end of the fourth cage and a third steel roller is installed at the upper end.

[0015] The distance between the auxiliary knife roller and the third steel roller is the same as the thickness of the auxiliary film.

[0016] After an auxiliary film enters the third steel roller, it enters the upper end of the second steel roller. After an auxiliary film enters the auxiliary knife roller, it enters the lower end of the first base roller.

[0017] In some embodiments, the auxiliary film is composed of several layers of PET film.

[0018] A third material receiving assembly is provided between the first material receiving assembly and the second material discharging assembly. The third material receiving assembly rewinds the PET waste on the upper layer after the auxiliary film is processed by the right circular knife machine.

[0019] The right end of the second receiving assembly is also provided with a fourth receiving assembly, which rewinds the lower layer of PET waste after the auxiliary film is processed by the right circular knife machine.

[0020] A fifth material receiving assembly is also provided between the left end of the second material receiving assembly and the third material discharging assembly. The fifth material receiving assembly rewinds the PET waste of the lower layer after the auxiliary film is processed by the left circular knife machine.

[0021] A sixth material receiving assembly is also provided at the upper left end of the outer side surface of the frame, and the sixth material receiving assembly rewinds the upper layer of PET waste after the auxiliary film is processed by the left circular knife machine.

[0022] In some embodiments, the auxiliary knife roller has a plurality of elliptical forming knives in a circumferential array, and second linear cutters are arranged between adjacent elliptical forming knives, and the spacing between adjacent second linear cutters is the same as the spacing between adjacent first linear cutters;

[0023] The spacing between the elliptical forming knife and the regular U-shaped wire knife is the same, and the width of the elliptical forming knife is the same as the width of the regular U-shaped wire knife.

[0024] In some embodiments, first positioning pins are further provided at both ends of the auxiliary knife roller, and the first positioning pins are used to process first positioning holes at both ends of the auxiliary film.

[0025] There are also second positioning pins at both ends of the main knife roller, and the second positioning pins process the second positioning holes at both ends of the main film.

[0026] The first locating pins are distributed in the same manner as the second locating pins and have the same size.

[0027] In some embodiments, the main circular knife machine includes a first holder, the main knife roller is mounted on the upper end of the first holder, the first base roller is mounted on the lower end of the first holder, the first steel roller is located between the main knife roller and the first base roller, the spacing between the first steel roller and the main knife roller is the thickness of the main film, and the spacing between the first steel roller and the first base roller is the thickness of the first semi-finished product;

[0028] The laminating machine comprises a second holder, an upper rubber roller is installed on the upper end of the second holder, an intermediate rubber roller is installed in the middle and a second steel roller is installed on the lower end, the spacing between the upper rubber roller and the intermediate rubber roller is the thickness of the second half film and the process protective film, and the spacing between the intermediate rubber roller and the second steel roller is the thickness of the second semi-finished product;

[0029] In some embodiments, guide rollers are installed at the front and rear ends of the first retaining frame, the second retaining frame, the third retaining frame, and the fourth retaining frame.

[0030] In some embodiments, the main film is a protective film, a PI adhesive and a hot melt adhesive from top to bottom, and a guide roller is also provided on the left end of the main circular knife machine.

[0031] The left end of the first unloading assembly is also provided with a fourth unloading assembly and a seventh collecting assembly. The process protective film is output in rolls through the fourth unloading assembly, the process protective film is attached to the second half film, and the waste of the process protective film is collected in rolls through the seventh collecting assembly.

[0032] The device realizes the centralized processing of U-shaped products and processes all pre-processed products on the main film at the same time. Moreover, the U-shaped products in the positive position and the U-shaped products in the reverse position appear alternately on the material strip, and the processing allowance is only the width of the blade, which greatly improves the utilization rate of the main film and reduces the generation of waste. Its beneficial effects are: first, the main materials of the products are highly utilized, which reduces the production cost. At the same time, the products are processed in a centralized manner, which reduces secondary processing, greatly improves the production efficiency and reduces the labor cost; second, the main materials of the products are processed once, and the materials have high flatness and straightness, which can effectively ensure the contour and position of the products and greatly improve the yield rate; third, compared with manual processing, it is faster and of higher quality; fourth, the processing allowance is only the width of the blade, which greatly improves the utilization rate of the main materials; fifth, the product is processed once and the auxiliary film of the product is fitted at the same time, which simplifies the process and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of a circular knife die-cutting nesting and material-saving device for U-shaped products according to one embodiment of the present invention;

[0034] Figure 2 for Figure 1 The enlarged schematic diagram of the left circular knife machine is shown;

[0035] Figure 3 for Figure 1 An enlarged schematic diagram of the laminating machine shown;

[0036] Figure 4 for Figure 1 An enlarged schematic diagram of the main circular knife machine is shown;

[0037] Figure 5 for Figure 1 An enlarged schematic diagram of the right circular knife machine is shown;

[0038] Figure 6 for Figure 4 A schematic front view of the main knife roller shown;

[0039] Figure 7 for Figure 6 The schematic diagram of the circumferential expansion of the main knife roller is shown;

[0040] Figure 8 for Figure 5 A schematic front view of the auxiliary knife roller shown;

[0041] Fig. 9 for Figure 8 A schematic diagram of the circumferential expansion of the auxiliary knife roller shown;

[0042] Fig.10 for Figure 1 The schematic diagram of the main film after being processed by the main knife roller is shown;

[0043] Fig.11 for Figure 1 The schematic diagram of the auxiliary film after being processed by the auxiliary knife roller;

[0044] Fig.12 for Figure 1 A schematic diagram of the first semi-finished product shown;

[0045] Fig.13 for Figure 1 A schematic diagram of the second semi-finished product shown;

[0046] Frame 1, base plate 2, left circular knife machine 3, auxiliary knife roller 30, elliptical forming knife 301, first positioning pin 302, second straight line cutter 303, third retaining frame 31, third steel roller 32, laminating machine 4, second retaining frame 40, second steel roller 41, middle rubber roller 42, upper rubber roller 43, main circular knife machine 5, main circular knife 50, positive U-shaped line knife 501, arc line 502, inverted U-shaped line knife 503, first straight line cutter 504, main knife roller 51, second positioning pin 511, first steel roller 52, first base roller 53, first retaining frame 54, right circular knife machine 6, fourth retaining frame 60, guide roller 7,

[0047] The first unloading assembly 11, the second unloading assembly 12, the third unloading assembly 13, the fourth unloading assembly 14, the first collecting assembly 21, the second collecting assembly 22, the third collecting assembly 23, the fourth collecting assembly 24, the fifth collecting assembly 25, the sixth collecting assembly 26, the seventh collecting assembly 27,

[0048] Main film 01 , first half film 011 , second half film 012 , auxiliary film 02 , first semi-finished product 03 , second semi-finished product 04 , PET waste 05 , process protection film 06 , process protection film waste 07 . DETAILED DESCRIPTION

[0049] The present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0050] Figures 1 to 13 A circular die cutting and nesting material saving device for U-shaped products according to an embodiment of the present invention is schematically shown. As shown in the figure, the device comprises a frame 1, a first material discharging assembly 11, a first material receiving assembly 21 and a second material discharging assembly 12 are vertically installed in sequence from the middle to the right at the upper end of the outer side surface of the frame 1, and a third material discharging assembly 13 and a second material receiving assembly 22 are vertically installed in sequence from the left to the middle at the lower end of the outer side surface of the frame 1.

[0051] The middle of the outer side of the frame 1 is vertically connected to the base plate 2, and the upper surface of the base plate 2 is sequentially installed with a laminating machine 4 and a main circular knife machine 5 from the left end to the right end.

[0052] The main circular knife machine 5 comprises a main knife roller 51, a first steel roller 52 and a first base roller 53 which are arranged in sequence from top to bottom. A main circular knife 50 is provided in the middle of the main knife roller 51. The main circular knife 50 is a circular array of regular U-shaped wire knives 501 with openings facing upwards. The upper ends of the inner straight lines of adjacent regular U-shaped wire knives 501 are connected by arc lines 502 to form inverted U-shaped wire knives 503 with openings facing downwards.

[0053] The main film 01 is rolled and placed on the first unwinding assembly 11. The main film 01 enters the main circular knife 50 and is processed into a first half film 011 and a second half film 012. The first half film 011 is separated by the first steel roller 52 and rotates to the lower end and moves backward. A number of inverted U-shaped holes with openings facing downward are evenly distributed on the first half film 011. The second half film 012 moves forward and turns to enter the second steel roller 41 through the middle rubber roller 42. A number of regular U-shaped holes with openings facing upward are evenly distributed on the second half film 012.

[0054] An auxiliary film 02 is placed on the second unwinding assembly 12 in a roll and enters the lower end of the first base roller 53. The first base roller 53 rotates to make the auxiliary film 02 adhere to the lower surface of the first half film 011 to become a first semi-finished product 03. The first semi-finished product 03 is collected in a roll by the first receiving assembly 21.

[0055] Another auxiliary film 02 is placed in a roll on the third unwinding component 13, enters the second steel roller 41 of the laminating machine 4, and is laminated on the lower surface of the second half film 012 to become a second semi-finished product 04. The second semi-finished product 04 is collected in a roll by the second receiving component 22.

[0056] The device realizes the centralized processing of U-shaped products and processes all pre-processed products on the main film at the same time. Moreover, the U-shaped products in the positive position and the U-shaped products in the reverse position appear alternately on the material strip, and the processing allowance is only the width of the blade, which greatly improves the utilization rate of the main film and reduces the generation of waste. Its beneficial effects are: first, the main materials of the products are highly utilized, which reduces the production cost. At the same time, the products are processed in a centralized manner, which reduces secondary processing, greatly improves the production efficiency and reduces the labor cost; second, the main materials of the products are processed once, and the materials have high flatness and straightness, which can effectively ensure the contour and position of the products and greatly improve the yield rate; third, compared with manual processing, it is faster and of higher quality; fourth, the processing allowance is only the width of the blade, which greatly improves the utilization rate of the main materials; fifth, the product's auxiliary film 02 is bonded in one processing, which simplifies the process and improves production efficiency.

[0057] Preferably, a plurality of main circular knives 50 are equidistantly distributed in the middle of the main knife roller 51 along the axial direction, and a first linear cutter 504 is respectively provided on the center line of adjacent main circular knives 50. The beneficial effect is that the arrangement realizes processing of multiple U-shaped products and inverted U-shaped product strips on the main film 01 at one time, and at the same time, the first linear cutter 504 realizes the slitting of each strip, so that each strip is collected in a roll.

[0058] Preferably, the opening lengths between the positive U-shaped wire cutter 501 and the inverted U-shaped wire cutter 503 are the same. The beneficial effect is that the specifications of all products are guaranteed to be the same.

[0059] Preferably, a left circular knife machine 3 is provided at the left end of the laminating machine 4, and a right circular knife machine 6 is provided at the right end of the main circular knife machine 5.

[0060] The left circular knife machine 3 includes a third retaining frame 31, an auxiliary knife roller 30 is installed at the upper end of the third retaining frame 31, and a third steel roller 32 is installed at the lower end.

[0061] The right circular knife machine 6 comprises a fourth retaining frame 60, the lower end of which is mounted an auxiliary knife roller 30 and the upper end of which is mounted a third steel roller 32.

[0062] The distance between the auxiliary knife roller 30 and the third steel roller 32 is the same as the thickness of the auxiliary film 02.

[0063] After an auxiliary film 02 enters the third steel roller 32 , it enters the upper end of the second steel roller 41 . After an auxiliary film 02 enters the auxiliary knife roller 30 , it enters the lower end of the first base roller 53 .

[0064] Preferably, the auxiliary film 02 is composed of several layers of PET film.

[0065] A third material receiving assembly 23 is provided between the first material receiving assembly 21 and the second material discharging assembly 12. The third material receiving assembly 23 rewinds the upper layer of PET waste 05 after the auxiliary film 02 is processed by the right circular knife machine 6.

[0066] The right end of the second receiving assembly 22 is further provided with a fourth receiving assembly 24, which rewinds the lower layer of PET waste 05 after the auxiliary film 02 is processed by the right circular knife machine 6.

[0067] A fifth material receiving assembly 25 is also provided between the left end of the second material receiving assembly 22 and the third material discharging assembly 13. The fifth material receiving assembly 25 rewinds the lower layer of PET waste 05 after the auxiliary film 02 is processed by the left circular knife machine 3.

[0068] A sixth material receiving assembly 26 is also provided at the upper left end of the outer side surface of the frame 1 , and the sixth material receiving assembly 26 rewinds the upper layer of PET waste 05 after the auxiliary film 02 is processed by the left circular knife machine 3 .

[0069] Preferably, the auxiliary knife roller 30 has a plurality of elliptical forming knives 301 arranged in a circumferential array, and second linear cutters 303 are arranged between adjacent elliptical forming knives 301, and the spacing between adjacent second linear cutters 303 is the same as the spacing between adjacent first linear cutters 504;

[0070] The distance between the elliptical shaping knife 301 and the regular U-shaped line knife 501 is the same, and the width of the elliptical shaping knife 301 is the same as the width of the regular U-shaped line knife 501. The beneficial effect is that the auxiliary film 02 of this arrangement can effectively fit the product.

[0071] Preferably, first positioning pins 302 are further provided at both ends of the auxiliary knife roller 30, and the first positioning pins 302 process the first positioning holes at both ends of the auxiliary film 02.

[0072] Second positioning pins 511 are also provided at both ends of the main knife roller 51, and the second positioning pins 511 process the second positioning holes at both ends of the main film 01.

[0073] The first positioning pins 302 are distributed in the same manner and have the same size as the second positioning pins 511. The beneficial effect is that the positioning pin arrangement effectively achieves high-precision positioning and lamination of the product.

[0074] Preferably, the main circular knife machine 5 includes a first retaining frame 54, the main knife roller 51 is installed at the upper end of the first retaining frame 54, the first base roller 53 is installed at the lower end of the first retaining frame 54, the first steel roller 52 is located between the main knife roller 51 and the first base roller 53, the spacing between the first steel roller 52 and the main knife roller 51 is the thickness of the main film 01, and the spacing between the first steel roller 52 and the first base roller 53 is the thickness of the first semi-finished product 03;

[0075] The laminating machine 4 comprises a second holder 40, wherein an upper glue roller 43 is mounted on the upper end of the second holder 40, an intermediate glue roller 42 is mounted in the middle, and a second steel roller 41 is mounted on the lower end. The distance between the upper glue roller 43 and the intermediate glue roller 42 is the thickness of the second half film 012 and the process protective film 06, and the distance between the intermediate glue roller 42 and the second steel roller 41 is the thickness of the second semi-finished product 04.

[0076] Preferably, the first retaining frame 54, the second retaining frame 40, the third retaining frame 31 and the fourth retaining frame 60 are all equipped with guide rollers 7 at both ends. The beneficial effect is that the guide rollers 7 can ensure the smooth conveying of the material belt and the stress-free lamination.

[0077] Preferably, the main film 01 is composed of a protective film, a PI adhesive and a hot melt adhesive from top to bottom, and a guide roller 7 is further provided on the left end of the main circular knife machine 5.

[0078] The left end of the first unloading assembly 11 is also provided with a fourth unloading assembly 14 and a seventh collecting assembly 27. The process protection film 06 is rolled out by the fourth unloading assembly 14, and the process protection film 06 is attached to the second half film 012. The process protection film waste 07 is collected in a roll by the seventh collecting assembly 27. The beneficial effect is that the process protection film 06 can effectively protect multiple products from being attached at the same time, and prevent the multiple products from swinging up and down, being irregular, and being difficult to position during movement.

[0079] Preferably, the first unloading assembly 11, the second unloading assembly 12, the third unloading assembly 13, the fourth unloading assembly 14, the first collecting assembly 21, the second collecting assembly 22, the third collecting assembly 23, the fourth collecting assembly 24, the fifth collecting assembly 25, the sixth collecting assembly 26 and the seventh collecting assembly 27 are all pneumatic shafts driven by servo electrical appliances.

[0080] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. The circular die cutting and nesting material saving device for U-shaped products is characterized by: The machine comprises a frame (1), wherein a first material discharging assembly (11), a first material receiving assembly (21) and a second material discharging assembly (12) are vertically mounted in sequence from the middle to the right on the upper end of the outer side surface of the frame (1), and a third material discharging assembly (13) and a second material receiving assembly (22) are vertically mounted in sequence from the left to the middle on the lower end of the outer side surface of the frame (1). The middle of the outer side surface of the frame (1) is vertically connected to the base plate (2), and the upper surface of the base plate (2) is provided with a laminating machine (4) and a main circular knife machine (5) in sequence from the left end to the right end. The main circular knife machine (5) comprises a main knife roller (51), a first steel roller (52) and a first base roller (53) which are arranged in sequence from top to bottom. A main circular knife (50) is provided in the middle of the main knife roller (51). The main circular knife (50) is a circular array of positive U-shaped wire knives (501) with an opening facing upward. The upper ends of the inner straight lines of adjacent positive U-shaped wire knives (501) are connected by arc lines (502) to form inverted U-shaped wire knives (503) with an opening facing downward. The main film (01) is rolled and placed on the first unwinding component (11). The main film (01) enters the main circular knife (50) and is processed into a first half film (011) and a second half film (012). The first half film (011) is separated by the first steel roller (52) and rotates to the lower end and moves backward. A plurality of inverted U-shaped holes with openings facing downward are evenly distributed on the first half film (011). The second half film (012) moves forward and turns to enter the second steel roller (41) through the middle rubber roller (42) of the laminating machine (4). A plurality of regular U-shaped holes with openings facing upward are evenly distributed on the second half film (012). An auxiliary film (02) is placed in a roll on the second unwinding component (12) and enters the lower end of the first base roller (53). The first base roller (53) rotates to make the auxiliary film (02) adhere to the lower surface of the first half film (011) to become a first semi-finished product (03). The first semi-finished product (03) is collected in a roll by the first receiving component (21). Another auxiliary film (02) is placed in a roll on the third unwinding component (13), enters the second steel roller (41), and adheres to the lower surface of the second half film (012) to become a second semi-finished product (04). The second semi-finished product (04) is collected in a roll by the second receiving component (22); A plurality of main circular knives (50) are equidistantly distributed in the middle of the main knife roller (51) along the axial direction, and a first straight line cutter (504) is respectively provided on the center line of adjacent main circular knives (50); The opening lengths between the positive U-shaped wire cutter (501) and the inverted U-shaped wire cutter (503) are the same; The left end of the laminating machine (4) is provided with a left circular knife machine (3), and the right end of the main circular knife machine (5) is provided with a right circular knife machine (6). The left circular knife machine (3) comprises a third retaining frame (31), an auxiliary knife roller (30) being mounted on the upper end of the third retaining frame (31) and a third steel roller (32) being mounted on the lower end. The right circular knife machine (6) comprises a fourth retaining frame (60), the auxiliary knife roller (30) being mounted on the lower end of the fourth retaining frame (60) and the third steel roller (32) being mounted on the upper end thereof. The distance between the auxiliary knife roller (30) and the third steel roller (32) is the same as the thickness of the auxiliary film (02). After one of the auxiliary films (02) enters the third steel roller (32), it enters the upper end of the second steel roller (41); after one of the auxiliary films (02) enters the auxiliary knife roller (30), it enters the lower end of the first base roller (53); The auxiliary film (02) is composed of several layers of PET film. A third material receiving assembly (23) is further provided between the first material receiving assembly (21) and the second material discharging assembly (12), and the third material receiving assembly (23) is used to reel in the upper layer of PET waste (05) of the auxiliary film (02) after being processed by the right circular knife machine (6). A fourth material receiving assembly (24) is also provided at the right end of the second material receiving assembly (22), and the fourth material receiving assembly (24) is used to reel in the lower layer of PET waste (05) of the auxiliary film (02) after being processed by the right circular knife machine (6). A fifth material receiving assembly (25) is further provided between the left end of the second material receiving assembly (22) and the third material discharging assembly (13), and the fifth material receiving assembly (25) is used to reel in the lower layer of PET waste (05) of the auxiliary film (02) after being processed by the left circular knife machine (3). A sixth material receiving assembly (26) is also provided at the upper left end of the outer side surface of the frame (1), and the sixth material receiving assembly (26) is used to reel in the upper layer of PET waste (05) of the auxiliary film (02) after being processed by the left circular knife machine (3); The main circular knife machine (5) comprises a first retaining frame (54), the main knife roller (51) is mounted on the upper end of the first retaining frame (54), the first base roller (53) is mounted on the lower end of the first retaining frame (54), the first steel roller (52) is located between the main knife roller (51) and the first base roller (53), the spacing between the first steel roller (52) and the main knife roller (51) is the thickness of the main film (01), and the spacing between the first steel roller (52) and the first base roller (53) is the thickness of the first semi-finished product (03); The laminating machine (4) comprises a second retaining frame (40), wherein an upper glue roller (43) is installed at the upper end of the second retaining frame (40), an intermediate glue roller (42) is installed in the middle, and the second steel roller (41) is installed at the lower end, the distance between the upper glue roller (43) and the intermediate glue roller (42) is the thickness of the second half film (012) and the process protective film (06), and the distance between the intermediate glue roller (42) and the second steel roller (41) is the thickness of the second semi-finished product (04).

2. The circular knife die cutting and nesting material saving device for U-shaped products according to claim 1 is characterized in that: The auxiliary knife roller (30) is provided with a plurality of elliptical forming knives (301) in a circular array, and second linear cutting knives (303) are arranged between adjacent elliptical forming knives (301), and the spacing between adjacent second linear cutting knives (303) is the same as the spacing between adjacent first linear cutting knives (504); The distance between the elliptical forming knife (301) and the regular U-shaped wire knife (501) is the same, and the width of the elliptical forming knife (301) is the same as the width of the regular U-shaped wire knife (501).

3. The circular knife die cutting and nesting material saving device for U-shaped products according to claim 2 is characterized in that: The auxiliary knife roller (30) is also provided with first positioning pins (302) at both ends, and the first positioning pins (302) are used to process first positioning holes at both ends of the auxiliary film (02). Second positioning pins (511) are also provided at both ends of the main knife roller (51), and the second positioning pins (511) are used to process second positioning holes at both ends of the main film (01). The distribution of the first positioning pins (302) and the distribution of the second positioning pins (511) are the same and the sizes are the same.

4. The circular knife die cutting and nesting material saving device for U-shaped products according to claim 1 is characterized in that: Guide rollers (7) are installed at the front and rear ends of the first retaining frame (54), the second retaining frame (40), the third retaining frame (31) and the fourth retaining frame (60).

5. The circular knife die cutting and nesting material saving device for U-shaped products according to claim 1 is characterized in that: The main film (01) is composed of a protective film, a PI adhesive and a hot melt adhesive from top to bottom. A guide roller (7) is also provided on the left end of the main circular knife machine (5). A fourth unloading component (14) and a seventh collecting component (27) are also provided at the left end of the first unloading component (11); the process protective film (06) is output in a roll through the fourth unloading component (14); the process protective film (06) is attached to the second half film (012); and the process protective film waste (07) is collected in a roll through the seventh collecting component (27).

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