A cutting assembly for profiled plastic sheet

Abstract

The utility model discloses a cutting assembly of special-shaped plastic sheet, including frame, be equipped with cutting platform, with the butt joint of cutting platform's conveyer belt and power assembly on the frame, still be equipped with the cutting assembly of being located cutting platform top on the frame, the cutting assembly of special-shaped plastic sheet of the utility model drives cutting roller rotation through power assembly, drives the cutting of cutter assembly of its outer wall to plastic sheet material on cutting platform, wherein cutter assembly is by the opposite lock -up fixed of upper tool rest and lower tool rest, and is equipped with respectively multiple groups of detachable upper blade piece and lower blade piece, and the alignment cooperation forms annular blade, adjusts the blade position through on different equidistance mounting position, can change cutting size flexibly to adapt to the different specification demand of paper box openwork window, solved the problem that traditional cutting device blade integral welding can not adjust, realized the convenient type adjustment of cutting width, improved the equipment application flexibility.

Description

Technical Field

[0001] This utility model relates to the field of paper box production technology, specifically to a cutting component for irregularly shaped plastic sheets. Background Technology

[0002] During the production of paper boxes, some paper box products have cut-out windows, and transparent plastic sheets are fitted onto these cut-out windows to form transparent cut-out gift boxes, thereby enhancing the aesthetics of the paper boxes.

[0003] Therefore, in the production process of paper boxes, in addition to cutting the cardboard to make it easy to fold into paper boxes, it is also necessary to cut the plastic sheet so that the shape of the plastic sheet fits the cut-out window on the paper box.

[0004] As described in the published patent CN218195611U, "A Cutting Device for Plastic Sheet Production," in the current plastic sheet production process, after extrusion, operators typically need to trim the rough edges on both sides of the extruded plastic sheet to shape it to the corresponding specifications. The remaining rough edges also need to be collected for recycling. Existing technology includes a plastic sheet cutting device, which can cut specific plastic sheets, but it cannot quickly adjust the width of the cut sheet, making it inflexible for various applications. To address the aforementioned issues, when the width of the plastic sheet needs adjustment, a cutting device for plastic sheet production is needed that can quickly and accurately adjust the set cutting width to improve the device's application flexibility.

[0005] In summary, the production process of paper boxes or gift boxes requires the cutting of transparent plastic sheets to fit the cutout windows on the paper boxes. Different sizes of paper boxes require different sizes of transparent plastic sheets. However, in some production technologies, the cutting blades of some cutting devices are welded as a single piece and cannot be replaced or adjusted, making it inconvenient to adapt to the cutting needs of different sizes of plastic sheets. Utility Model Content

[0006] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0007] To achieve the above objectives, this utility model provides the following technical solution: A cutting assembly for irregularly shaped plastic sheets includes a frame, on which a cutting platform, a conveyor belt connected to the cutting platform, and a power assembly are mounted. The frame is also equipped with a cutting assembly located above the cutting platform. The cutting assembly includes a cutting roller rotatably mounted on a frame, a drive wheel at the end of the cutting roller, and a cutting blade assembly mounted on the outer wall of the cutting roller; The transmission wheel is connected to the power assembly for transmission. The cutting blade assembly includes an upper blade holder and a lower blade holder mounted on the cutting roller, and the upper blade holder and the lower blade holder are locked and fixed relative to each other on the cutting roller; The upper blade holder is provided with multiple upper blade mounting positions at equal intervals, and upper blade components are detachably mounted on each of the multiple upper blade mounting positions; The lower blade holder is provided with a plurality of lower blade mounting positions that correspond one-to-one with the upper blade mounting positions. Each of the plurality of lower blade mounting positions is detachably mounted with a lower blade component. The upper and lower blade components, which are aligned and fitted together, lock together to form a ring-shaped blade.

[0008] As a further embodiment of this utility model: the upper blade holder includes a semi-circular upper frame body sleeved on the cutting roller, upper mounting plates are symmetrically fixedly installed on both sides of the semi-circular upper frame body, the upper blade mounting position includes an upper blade mounting groove opened on the end face of the upper mounting plate, and the bottom of the upper blade piece is formed with an upper blade mounting block that is inserted and matched with the upper blade mounting groove.

[0009] As a further embodiment of this utility model: the lower blade holder includes a semi-circular lower frame body sleeved on the cutting roller, the semi-circular lower frame body and the semi-circular upper frame body together form a cylindrical cavity adapted to the outer wall of the cutting roller, lower mounting plates are symmetrically fixedly installed on both sides of the semi-circular lower frame body, the lower blade mounting position includes a lower blade mounting groove opened on the end face of the lower mounting plate, and the bottom of the lower blade piece is formed with a lower blade mounting block that is inserted and matched with the lower blade mounting groove.

[0010] As a further embodiment of this utility model: the end faces of the upper blade and the lower blade are provided with arc-shaped mounting grooves that are adapted to the outer walls of the semi-circular upper frame and the semi-circular lower frame, respectively. The inner bottom surface of the arc-shaped mounting groove is provided with a blade force groove. The outer walls of the semi-circular upper frame and the semi-circular lower frame are respectively formed with auxiliary support strips, which are inserted and fitted in the blade force groove.

[0011] As a further embodiment of this utility model: the side of the upper mounting plate is provided with a plurality of upper blade slots that correspond one-to-one with the upper blade mounting slots; the side of the lower mounting plate is provided with a plurality of lower blade slots that correspond one-to-one with the lower blade mounting slots; the bottom of the upper blade is formed with an upper blade extension that is inserted into the upper blade slots; and the bottom of the lower blade is formed with a lower blade extension that is inserted into the lower blade slots.

[0012] As a further aspect of this utility model, the thickness of the upper and lower blades decreases uniformly from the center to the edge.

[0013] As a further embodiment of this utility model: the outer wall of the transmission wheel is equipped with a transmission gear component, and the power component meshes with the transmission gear component for transmission.

[0014] As a further embodiment of this utility model: limiting rings are fixedly installed at both ends of the cutting roller, and the limiting rings stop and limit the ends of the upper and lower blade holders.

[0015] As a further embodiment of this utility model: the upper mounting plate is provided with a through auxiliary positioning groove, and the lower mounting plate is fixed with an auxiliary positioning block that is inserted and cooperates with the auxiliary positioning groove.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model's cutting assembly for irregularly shaped plastic sheets uses a power component to drive the cutting roller to rotate, which in turn drives the cutting blade assembly on its outer wall to cut the plastic sheet on the cutting platform. The cutting blade assembly consists of an upper blade holder and a lower blade holder that are locked together and fixed in place. It is equipped with multiple sets of detachable upper and lower blade components, which are aligned and fitted together to form a ring blade. By adjusting the blade position at different equidistant installation positions, the cutting size can be flexibly changed to adapt to different specifications of cardboard box cutout windows. This invention solves the problem of traditional cutting devices where the blades are integrally welded and cannot be adjusted, and realizes convenient adjustment of the cutting width, improving the flexibility of equipment application. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural view of the present invention; Figure 2 yes Figure 1 A partial view at point A in the middle; Figure 3 This is another three-dimensional view of the structure of this utility model; Figure 4 yes Figure 3 A partial view at point B in the middle; Figure 5 This is a three-dimensional view of the cutting roller structure in this utility model; Figure 6 This is a three-dimensional structural view of the cutting blade assembly in this utility model; Figure 7 This is a three-dimensional view of the upper tool holder structure in this utility model; Figure 8 yes Figure 7 A partial view at point C; Figure 9 This is a three-dimensional structural view of the lower tool holder in this utility model; Figure 10This is a three-dimensional structural view of the upper blade component in this utility model; Figure 11 This is another three-dimensional view of the upper blade component in this utility model; The reference numerals and names in the figure are as follows: Frame-101, Cutting Platform-103, Conveyor Belt-104, Cutting Roller-106, Drive Wheel-107, Cutting Blade Assembly-108, Upper Blade Holder-110, Lower Blade Holder-111, Upper Blade Mounting Position-112, Upper Blade Unit-113, Lower Blade Mounting Position-114, Circular Blade-116, Semi-circular Upper Frame-117, Upper Mounting Plate-118, Upper Blade Mounting Slot-119, Upper Blade Mounting Block -120, Semi-circular lower frame -121, Cylindrical chamber -122, Lower mounting plate -123, Lower blade mounting groove -124, Arc-shaped mounting groove -126, Blade force groove -127, Auxiliary support bar -128, Upper blade slot -129, Upper blade extension -130, Lower blade slot -131, Transmission gear component -135, Limiting ring -136, Auxiliary positioning groove -137, Auxiliary positioning block -138. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-11 A cutting assembly for irregularly shaped plastic sheets includes a frame 101, on which a cutting platform 103, a conveyor belt 104 connected to the cutting platform 103, and a power assembly are mounted. The frame 101 is also equipped with a cutting assembly located above the cutting platform 103. The cutting assembly includes a cutting roller 106 rotatably mounted on a frame 101, a drive wheel 107 mounted at the end of the cutting roller, and a cutting blade assembly 108 mounted on the outer wall of the cutting roller. The transmission wheel 107 is connected to the power assembly for transmission. like Figure 1 and Figure 2As shown, the irregular plastic sheet cutting component of this utility model uses a modular blade design that is "detachable and repositionable". Multiple upper blade mounting positions 112 and lower blade mounting positions 114 are respectively set on the upper and lower blade holders 111. With the upper and lower blade components that can be installed and removed separately, the operator can easily adjust the effective cutting width of the ring blade 116 according to the target cutting requirements. Thus, the same machine can easily handle the plastic sheet size required for the cutout window of different specifications of cardboard boxes. This design fundamentally solves the problem that the traditional one-piece welded cutting blade cannot change the specifications. It enables enterprises to meet the diversified and small-batch customized production needs with a single machine, greatly expanding the order range. It does not require the purchase of special equipment for each new specification of product, avoiding waste of equipment investment and occupation of production space. Secondly, the entire cutting process integrates automated conveying and continuous cutting actions. The plastic sheet automatically enters the cutting platform 103 through the feeding component, and the cutting roller 106 driven by the power component performs continuous rotational cutting. The finished product after cutting is then automatically transported to the next station by the conveyor belt 104, which significantly reduces the labor intensity of the operators. The cutting blade assembly 108 includes an upper blade holder 110 and a lower blade holder 111 mounted on the cutting roller 106, and the upper blade holder 110 and the lower blade holder 111 are locked and fixed relative to each other on the cutting roller 106; The upper blade holder 110 is provided with a plurality of upper blade mounting positions 112 at equal intervals, and upper blade components 113 are detachably mounted on the plurality of upper blade mounting positions 112 respectively; The lower blade holder 111 is provided with a plurality of lower blade mounting positions 114 at equal intervals, which correspond one-to-one with the upper blade mounting positions 112. The plurality of lower blade mounting positions 114 are respectively detachably equipped with lower blade components. The upper and lower blade components 113 and 116 are aligned and locked together to form an annular blade 116. At the same time, such as Figure 6 As shown, the upper and lower blades are interlocked to form a complete shearing closed loop. This structure is essentially a continuous shearing process when cutting plastic sheets, ensuring that the cut edges are flat and smooth, effectively improving the yield of finished plastic sheets. The stable locking of the blades on the blade holder and the rigid transmission of the cutting roller 106 ensure the consistency of the cutting trajectory, thereby ensuring the stability of the dimensions of batch products. The modular blade design means that when a local blade wears or is damaged, there is no need to replace the entire expensive cutting assembly; only one or a few blades need to be replaced, reducing maintenance costs and downtime. The cutting assembly of this utility model for irregularly shaped plastic sheets drives the cutting roller 106 to rotate via a power assembly, which in turn drives the cutting blade assembly 108 on its outer wall to cut the plastic sheet on the cutting platform 103. The cutting blade assembly 108 is fixedly locked together by an upper blade holder 110 and a lower blade holder 111, and is provided with multiple sets of detachable upper blade parts 113 and lower blade parts, which are aligned to form a ring blade 116. By adjusting the blade position at different equidistant installation positions, the cutting size can be flexibly changed to adapt to different specifications of cardboard box cutout windows. This solves the problem that the blades of traditional cutting devices are integrally welded and cannot be adjusted, realizes convenient adjustment of cutting width, and improves the flexibility of equipment application. The plastic sheet is fed to the cutting platform 103 through the feeding component. The cutting component cuts the plastic sheet and the finished plastic sheet is sent to the next work station through the conveyor belt 104. In one embodiment, the front end of the cutting component is equipped with a feeding component, and the rear end of the conveyor belt 104 is equipped with a feeding component. The feeding component and the feeding component are publicly available technologies in the art and will not be described in detail here. In one embodiment, the frame 101 is further equipped with a waste recycling component for recycling the cut scraps. The waste recycling component is a publicly available technology in the art and will not be described in detail here. In one embodiment, the power component is a publicly available technology in the art, and will not be described in detail here.

[0020] In this embodiment of the present invention, the upper blade holder 110 includes a semi-circular upper frame 117 sleeved on the cutting roller 106, upper mounting plates 118 are symmetrically fixedly installed on both sides of the semi-circular upper frame 117, the upper blade mounting position 112 includes an upper blade mounting groove 119 opened on the end face of the upper mounting plate 118, and the bottom of the upper blade piece 113 is formed with an upper blade mounting block 120 that is inserted and matched with the upper blade mounting groove 119. like Figure 5 and 6 As shown, the semi-circular upper frame 117 is fitted onto the cutting roller 106, providing a stable installation base. The symmetrical upper mounting plates 118 on both sides and the upper blade mounting grooves 119 on their end faces form an interlocking fit with the upper blade mounting block 120 formed at the bottom of the upper blade 113, realizing the rapid positioning and mechanical locking of the upper blade 113. This design allows each upper blade 113 to be independently and stably installed in its predetermined position, forming a stable shearing combination with the lower blade. The plug-in structure ensures the ease of blade installation and positioning accuracy, while guaranteeing the precision of the cutting dimensions. At the same time, this design enables quick and individual blade replacement, reducing downtime for maintenance when blades wear out or when the cutting specifications need to be adjusted.

[0021] In this embodiment of the present invention, the lower blade holder 111 includes a semi-circular lower frame body 121 sleeved on the cutting roller 106. The semi-circular lower frame body 121 and the semi-circular upper frame body 117 enclose a cylindrical cavity 122 adapted to the outer wall of the cutting roller 106. Lower mounting plates 123 are symmetrically fixedly installed on both sides of the semi-circular lower frame body 121. The lower blade mounting position 114 includes a lower blade mounting groove 124 opened on the end face of the lower mounting plate 123. The bottom of the lower blade is formed with a lower blade mounting block that is inserted into and cooperates with the lower blade mounting groove 124. like Figure 9 As shown, the semi-circular lower frame 121 and the semi-circular upper frame 117 together form a cylindrical cavity 122 that is tightly fitted to the outer wall of the cutting roller 106, ensuring the overall structural stability. At the same time, the lower blade mounting groove 124 on the lower mounting plate 123 and the mounting block at the bottom of the lower blade form an interlocking fit, realizing the alignment and fixation of the lower blade and the upper blade 113. First, the stable cylindrical chamber 122 formed by the upper and lower frames ensures the rigidity and balance of the cutting assembly during operation, effectively reducing vibration and thus improving cutting stability. Second, the independent plug-in installation method of the lower blade complements the upper blade 113, enabling rapid positioning and replacement of the blade and improving the efficiency of adjusting cutting specifications and maintenance operations.

[0022] In this embodiment of the utility model, the end faces of the upper blade 113 and the lower blade are provided with arc-shaped mounting grooves 126 that are adapted to the outer walls of the semi-circular upper frame 117 and the semi-circular lower frame 121, respectively. The inner bottom surface of the arc-shaped mounting groove 126 is provided with a blade force groove 127. The outer walls of the semi-circular upper frame 117 and the semi-circular lower frame 121 are respectively formed with auxiliary support strips 128, and the auxiliary support strips 128 are inserted and fitted in the blade force groove 127. like Figure 6 and Figure 7 As shown, the upper blade 113 and the lower blade are tightly fitted to the outer wall of the semi-circular upper and lower frame through the arc-shaped mounting groove 126 on the end face, achieving initial positioning and load-bearing. At the same time, the auxiliary support bar 128 on the frame is inserted into the blade force groove 127 to form a plug-in fit. The auxiliary support bar 128 provides additional rigid support from the back of the blade, enhancing the blade's resistance to bending and deformation when subjected to cutting resistance, and effectively improving the stability of cutting. In addition, this structure evenly transmits the force generated by cutting to the sturdy frame through the support bar, avoiding stress concentration damage to the blade itself.

[0023] In this embodiment of the present invention, the side of the upper mounting plate 118 is provided with a plurality of upper blade slots 129 that correspond one-to-one with the upper blade mounting slots 119, and the side of the lower mounting plate 123 is provided with a plurality of lower blade slots 131 that correspond one-to-one with the lower blade mounting slots 124. The bottom of the upper blade 113 is formed with an upper blade extension 130 that is inserted into the upper blade slots 129, and the bottom of the lower blade is formed with a lower blade extension that is inserted into the lower blade slots 131. like Figure 7 , Figure 8 and Figure 10 As shown, by opening upper blade slots 129 and lower blade slots 131 on the sides of the upper and lower mounting plates 123, which correspond one-to-one with the upper blade mounting slots 119 and lower blade mounting slots 124, and inserting the upper blade extensions 130 and lower blade extensions at the bottom of the upper and lower blades into them, additional positioning and clamping points are provided for each blade in the lateral direction, so that the blade mounting slots and blade slots together form a multi-dimensional stable constraint. Meanwhile, the upper blade extension 130 and the lower blade extension are connected to each other, so that the edges of the upper blade 113 and the lower blade form a continuous cutting edge, reducing defects in the plastic sheet cutting process. In actual operation, the edges of the upper blade extension 130 and the lower blade extension extend out of the upper mounting plate 118 and the lower mounting plate 123 respectively to ensure the cutting effect of the plastic sheet.

[0024] In this embodiment of the present invention, the thickness of the upper blade 113 and the lower blade decreases uniformly from the center to the edge. like Figure 11 As shown, by designing the thickness of the upper blade 113 and the lower blade as a wedge-shaped structure that decreases uniformly from the center to the edge, the cutting edge of the blade is made the thinnest and sharpest. During the cutting process, the gradually thinning cutting edge can cut into the plastic sheet more smoothly and with less effort, effectively reducing material deformation or burrs. In addition, the thicker part in the center provides a supporting base for the blade, ensuring the overall structural strength and deformation resistance of the blade.

[0025] In this embodiment of the utility model, the outer wall of the transmission wheel 107 is equipped with a transmission gear component 135, and the power component meshes with the transmission gear component 135 for transmission. like Figure 3 and 4 As shown, by installing a transmission gear 135 on the outer wall of the transmission wheel 107, the transmission gear 135 and the power component form a stable gear meshing transmission, realizing the reliable transmission of power from the power component to the cutting roller 106, ensuring the synchronization between the cutting action and the material feed, and improving the accuracy of the cutting size; at the same time, the gear transmission structure has a strong load-bearing capacity and runs smoothly.

[0026] In this embodiment of the present invention, limiting rings 136 are fixedly installed at both ends of the cutting roller 106, and the limiting rings 136 stop and limit the ends of the upper blade holder 110 and the lower blade holder 111. like Figure 5 and 6 As shown, by fixing the limiting rings 136 at both ends of the cutting roller 106, rigid stops are formed on both end faces of the upper blade holder 110 and the lower blade holder 111 assembled on the cutting roller 106. First, it effectively limits the axial displacement or movement that may occur when the blade holder assembly rotates the cutting roller 106, ensuring that the position of the blade remains unchanged during the cutting process and guaranteeing the long-term stability of the cutting dimensions. Second, this strong axial constraint avoids abnormal wear, vibration or noise caused by minor movement of components. like Figure 6 As shown, in one embodiment, a locking bolt is installed on the limiting ring 136, and the locking bolt passes through the limiting ring 136 to lock and fix the upper mounting plate 118 and the lower mounting plate 123.

[0027] In this embodiment of the utility model, the upper mounting plate 118 is provided with a through auxiliary positioning groove 137, and the lower mounting plate 123 is fixed with an auxiliary positioning block 138 that is inserted and cooperates with the auxiliary positioning groove 137. like Figure 7 and 9 As shown, the auxiliary positioning block 138 set on the lower mounting plate 123 is inserted and engaged with the auxiliary positioning groove 137 that passes through the upper mounting plate 118, so that the upper and lower tool holders 111 are automatically aligned before being locked and fixed, which improves the accuracy of the installation of the upper and lower blades. The guiding effect of the auxiliary positioning block 138 and the groove effectively eliminates the circumferential or lateral misalignment that may occur during the installation process.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A cutting assembly for profiled plastic sheeting, characterized in that it comprises: Includes a frame (101), on which a cutting platform (103), a conveyor belt (104) connected to the cutting platform (103), and a power assembly are mounted; the frame (101) is also equipped with a cutting assembly located above the cutting platform (103); The cutting assembly includes a cutting roller (106) rotatably mounted on a frame (101), a drive wheel (107) is mounted at the end of the cutting roller, and a cutting blade assembly (108) is mounted on the outer wall of the cutting roller. The transmission wheel (107) is connected to the power assembly for transmission; The cutting blade assembly (108) includes an upper blade holder (110) and a lower blade holder (111) mounted on the cutting roller (106), and the upper blade holder (110) and the lower blade holder (111) are locked and fixed relative to each other on the cutting roller (106); The upper blade holder (110) is provided with multiple upper blade mounting positions (112) at equal intervals, and upper blade components (113) are detachably mounted on the multiple upper blade mounting positions (112). The lower blade holder (111) is provided with a plurality of lower blade mounting positions (114) that correspond one-to-one with the upper blade mounting positions (112), and the plurality of lower blade mounting positions (114) are respectively detachably mounted with lower blade components; The upper blade (113) and lower blade are aligned and locked together to form an annular blade (116).

2. The cutting assembly of claim 1, wherein the cutting assembly further comprises a cutting device configured to cut the profiled plastic sheet into a plurality of profiled plastic pieces. The upper blade holder (110) includes a semi-circular upper frame body (117) sleeved on the cutting roller (106). Upper mounting plates (118) are symmetrically fixed on both sides of the semi-circular upper frame body (117). The upper blade mounting position (112) includes an upper blade mounting groove (119) opened on the end face of the upper mounting plate (118). The bottom of the upper blade piece (113) is formed with an upper blade mounting block (120) that is inserted and matched with the upper blade mounting groove (119).

3. The cutting assembly for irregularly shaped plastic sheets according to claim 2, characterized in that, The lower blade holder (111) includes a semi-circular lower frame body (121) sleeved on the cutting roller (106). The semi-circular lower frame body (121) and the semi-circular upper frame body (117) enclose a cylindrical cavity (122) adapted to the outer wall of the cutting roller (106). Lower mounting plates (123) are symmetrically fixed on both sides of the semi-circular lower frame body (121). The lower blade mounting position (114) includes a lower blade mounting groove (124) opened on the end face of the lower mounting plate (123). The bottom of the lower blade piece is formed with a lower blade mounting block that is inserted and matched with the lower blade mounting groove (124).

4. A cutting assembly for irregularly shaped plastic sheets according to any one of claims 1-3, characterized in that, The upper blade (113) and the lower blade are provided with arc-shaped mounting grooves (126) that are adapted to the outer walls of the semi-circular upper frame (117) and the semi-circular lower frame (121), respectively. The inner bottom surface of the arc-shaped mounting groove (126) is provided with a blade force groove (127). The outer walls of the semi-circular upper frame (117) and the semi-circular lower frame (121) are respectively formed with auxiliary support strips (128). The auxiliary support strips (128) are inserted into the blade force groove (127).

5. The cutting assembly for irregularly shaped plastic sheets according to claim 3, characterized in that, The upper mounting plate (118) has a plurality of upper blade slots (129) on its side, which correspond one-to-one with the upper blade mounting slots (119). The lower mounting plate (123) has a plurality of lower blade slots (131) on its side, which correspond one-to-one with the lower blade mounting slots (124). The bottom of the upper blade component (113) is formed with an upper blade extension (130) that is inserted into the upper blade slots (129). The bottom of the lower blade component is formed with a lower blade extension that is inserted into the lower blade slots (131).

6. The cutting assembly for irregularly shaped plastic sheets according to claim 4, characterized in that, The thickness of the upper blade (113) and the lower blade decreases uniformly from the center to the edge.

7. The cutting assembly for irregularly shaped plastic sheets according to claim 6, characterized in that, The outer wall of the transmission wheel (107) is equipped with a transmission gear (135), and the power assembly meshes with the transmission gear (135) for transmission.

8. The cutting assembly for irregularly shaped plastic sheets according to claim 7, characterized in that, The cutting roller (106) is fixedly equipped with limiting rings (136) at both ends, and the limiting rings (136) stop and limit the ends of the upper knife holder (110) and the lower knife holder (111).

9. The cutting assembly for irregularly shaped plastic sheets according to claim 5, characterized in that, The upper mounting plate (118) has a through auxiliary positioning groove (137), and the lower mounting plate (123) has an auxiliary positioning block (138) that is inserted into and cooperates with the auxiliary positioning groove (137).

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