A packaging film trimming device

Abstract

This application discloses a packaging film edge-cutting device, including a slider, a motor, a cutting blade, and other components, as well as a quick-release assembly. The slider has a mounting groove and a fixing plate. The mounting block is connected to the mounting groove through the quick-release assembly. The pressure plate is at the bottom of the mounting block and has a through hole adapted to the motor output shaft. The cutting blade is mounted on the motor shaft via a spline. The quick-release assembly includes multiple components such as a fixing shell. Its drive assembly has a handle rod that can control the insertion and locking. During installation, after the mounting block is placed in the mounting groove, the handle rod is rotated, and the insertion block is inserted into the insertion groove. The pusher makes the pressure block and the locking hook lock together to achieve a tight lock. During operation, the motor drives the cutting blade to cut the edge. During disassembly, the handle rod is rotated in the opposite direction to release the locking and insertion, and the mounting block can be removed. This facilitates the replacement or maintenance of the motor and the cutting blade, solving the problem of inconvenient replacement of cutting components.

Description

Technical Field

[0001] This invention relates to the field of packaging machinery technology, and in particular to a packaging film trimming device. Background Technology

[0002] In the production and processing of packaging films, it is often necessary to cut and trim the edges of the film to ensure the dimensional accuracy and quality of the film. Currently, in the devices used for cutting the edges of packaging films, the cutting blade is usually driven by a motor to rotate and achieve the cutting action. The installation structure of components such as the motor and the cutting blade is often relatively fixed.

[0003] For example, the patent publication number CN220922646U, "A Production and Processing Device for Packaging Films," describes a device where the cutting disc is installed in a groove of a cutting frame and driven to rotate by a drive motor. Although the device can sharpen the cutting disc with a whetstone to maintain its sharpness, in actual use, when the cutting disc is severely worn and needs replacement, or when the motor malfunctions and requires maintenance, the fixed mounting structure between the cutting disc and the motor necessitates the disassembly and installation of multiple connecting parts. This cumbersome operation often requires specialized tools and is time-consuming, severely impacting the efficiency of edge-cutting operations and failing to meet the needs for rapid replacement and maintenance. Therefore, improvements are necessary. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems existing in the prior art.

[0005] This application provides a packaging film cutting device, including a slider, a motor and a cutting blade, and also includes a fixed plate, a pressure plate, a mounting groove, a mounting block and a quick-release assembly. The slider has a mounting groove on one side and a fixed plate fixed at the bottom. The mounting block is detachably installed in the mounting groove through the quick-release assembly and a pressure plate is fixed at the bottom. The pressure plate has a through hole at the bottom that is adapted to the motor output shaft. The cutting blade is installed on the motor output shaft through a spline and a spline groove.

[0006] The quick-release assembly includes a fixed shell, a recess, a plug-in slot, a hook, a plug-in component, a snap-fit ​​component, and a drive component. The fixed shell is fixed to the bottom of the mounting slot, and the plug-in component, snap-fit ​​component, and drive component are installed inside it. The recess is set on the mounting block, the hook is fixed at the bottom of the recess, and the plug-in slot is set on the side wall. The drive component is used to control the plug-in component and the snap-fit ​​component to plug into the slot and snap into the hook, respectively.

[0007] The drive assembly includes a rotating block, a connecting groove, a transmission groove, a transmission block, and a lever. The connecting groove is located on the outer wall of the fixed plate and communicates with the inner cavity of the fixed shell. The rotating block is rotatably installed in the inner cavity of the fixed shell, with a transmission groove at its inner end, a lever fixed on its peripheral wall, and a handle rod fixedly connected to its outer end in the connecting groove. The transmission block is fixed on the plug-in assembly and engages with the transmission groove. The lever is used to move the locking assembly and the hook to engage or disengage.

[0008] The inner end of the fixed shell cavity is provided with a pair of arc strips concentric with the rotating block, and the inner end face of the rotating block is provided with an annular groove that slides with the arc strips.

[0009] The transmission groove includes an eccentric section and a concentric section that are connected to each other. Both the eccentric section and the concentric section are arc-shaped. The two ends of the eccentric section are at different distances from the axis of the rotating block. The end that is farther from the axis of the rotating block is connected to one end of the concentric section. The concentric section and the axis of the rotating block are at the same center.

[0010] The plug-in assembly includes a connecting shell, a plug block, and a connecting plate. The connecting shell is fixed on the outer peripheral wall of the fixed shell and its inner end is connected to the inner cavity of the fixed shell. Its outer end is open and aligned with the plug-in slot. The plug block is slidably inserted into the connecting shell. Its inner end is connected to the transmission block through the connecting plate, and its outer end is used to plug into the plug-in slot.

[0011] The snap-fit ​​assembly includes a through slot, a floating slot, a side slot, a pusher slot, a floating block, and a pressure block. The floating slot has a through-hole block at the front and back, and the floating block is floatingly installed therein. The through slot is opened on the connecting shell to allow the snap hook to be inserted into the floating slot. The side slot is located at the inner end of the through-hole block. The pressure block is located at the end of the floating block facing the through slot. The pusher slot is located at the other end of the floating block. A triangular block is fixed at the bottom of the pusher slot, and the inclined surface of the triangular block faces the pusher block.

[0012] The inner wall of the floating groove is symmetrically provided with retaining grooves, which are parallel to the axis of the rotating block. The floating block is provided with a retaining slider that slides in cooperation with the retaining groove.

[0013] The bottom of the handle has a notch, and a fixing block with a shape that matches the notch is fixed on the outer wall of the fixing plate. A sleeve is floatingly fitted on the outside of the handle, and the sleeve can be fitted over the fixing block when the fixing block and the notch are engaged.

[0014] A fixed protruding ring is fixed at the top of the handle, and a return spring is sleeved on the outside. A movable protruding ring is fixed on the peripheral wall of the sleeve. The upper and lower ends of the return spring abut against the opposing surfaces of the fixed and movable protruding rings, respectively.

[0015] Each plug slot, hook, plug assembly, and snap assembly is provided in pairs, and a pair of plug assemblies and snap assemblies share a single drive assembly.

[0016] The beneficial effects of this invention are as follows:

[0017] Quick assembly and disassembly of the cutting blade and motor: This invention achieves quick and detachable connection between the mounting block and the slider through a quick-release component. When it is necessary to replace the cutting blade or maintain the motor, it is not necessary to disassemble multiple fixed parts. The mounting block can be assembled and disassembled simply by operating the drive component, which greatly shortens the replacement and maintenance time and effectively solves the problem of inconvenient cutting blade replacement in the prior art.

[0018] Easy and effortless to operate: The drive component in the quick-release assembly can synchronously control the insertion and engagement of the plug-in component and the plug slot, as well as the engagement of the snap-fit ​​component and the snap-fit ​​hook. The locking or unlocking action can be completed by turning the handle rod without the need for special tools. Compared with the complicated operation of disassembling the cutting frame and related parts in the existing technology, it is more convenient and efficient.

[0019] The connection is firm and stable: the plug-in assembly and the plug slot are plugged in together, and the snap-fit ​​assembly and the snap-fit ​​hook are snap-fit ​​together to form a double fixation. At the same time, the handle rod is locked by the sleeve and the return spring, which can effectively prevent accidental loosening during operation and ensure the reliability of the device operation. Compared with the existing technology that simply relies on bolts and other fixing methods, the connection stability is better.

[0020] Easier to install and remove the cutting disc: The cutting disc is mounted on the motor output shaft via splines and spline slots, which further simplifies the process of replacing the cutting disc individually. The cutting disc can be quickly removed or installed without additional tools. In contrast, the connection method between the cutting disc and the output end of the drive motor in the existing technology does not reflect this quick-release design, resulting in lower replacement efficiency.

[0021] The structural design is more reasonable: a pair of plug-in components and snap-fit ​​components share a single drive component, which not only ensures that the force is evenly distributed on both sides of the mounting block, but also simplifies the overall structure and reduces manufacturing and maintenance costs. Compared with the dispersed fixed structure in the existing technology, it has a higher degree of integration and is more practical. Attached Figure Description

[0022] Figure 1 This is a perspective view of the packaging film cutting device in the embodiments of this application;

[0023] Figure 2 This is a perspective view (partially cut longitudinally) of the packaging film cutting device in an embodiment of this application.

[0024] Figure 3 This is a perspective view (horizontal section) of the packaging film cutting device in an embodiment of this application.

[0025] Figure 4 This is a perspective view of the fixed shell in an embodiment of this application (when it has an internal structure);

[0026] Figure 5 This is a perspective view of the fixed shell in an embodiment of this application (cut open to show the internal structure);

[0027] Figure 6 This is a perspective view of the plug-in component, snap-in component, and drive component in the embodiments of this application;

[0028] Figure 7 This is a perspective view of the plug-in component, snap-in component, and drive component in the embodiments of this application;

[0029] Figure 8This is a perspective view of the fixed shell in an embodiment of this application (without internal structure).

[0030] Figure Labels

[0031] 1-Slider, 2-Motor, 3-Cut blade, 4-Fixing plate, 5-Pressure plate, 6-Mounting slot, 7-Mounting block, 8-Quick release assembly, 81-Fixing shell, 82-Groove, 83-Plug-in slot, 84-Hook, 9-Plug-in assembly, 91-Connecting shell, 92-Plug-in block, 93-Connecting plate, 10-Snap-in assembly, 101-Through slot, 102-Floating slot, 103-Side slot, 104-Pulling slot, 105-Floating block, 106-Pressure block, 107-Triangle 108-Retaining groove, 109-Retaining slider, 11-Drive assembly, 111-Rotating block, 112-Connecting groove, 113-Transmission groove, 1131-Eccentric section, 1132-Concentric section, 114-Transmission block, 115-Pulling block, 116-Handle lever, 117-Notch, 118-Fixing block, 119-Sleeve, 1110-Fixing convex ring, 1111-Reset spring, 1112-Moving convex ring, 12-Arc strip, 13-Ring groove. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0033] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0034] The packaging film trimming device provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0035] Example 1:

[0036] This application provides a packaging film cutting device, including a slider 1, a motor 2 and a cutting blade 3, as well as a fixing plate 4, a pressure plate 5, a mounting groove 6, a mounting block 7 and a quick-release assembly 8. The slider 1 has a mounting groove 6 on one side and a fixing plate 4 fixed at the bottom. The mounting block 7 is detachably installed in the mounting groove 6 through the quick-release assembly 8 and a pressure plate 5 fixed at the bottom. The pressure plate 5 has a through hole at the bottom that is adapted to the output shaft of the motor 2. The cutting blade 3 is installed on the output shaft of the motor 2 through a spline and a spline groove.

[0037] The quick-release assembly 8 includes a fixed housing 81, a recess 82, a plug-in slot 83, a hook 84, a plug-in assembly 9, a snap-in assembly 10, and a drive assembly 11. The fixed housing 81 is fixed to the bottom of the mounting slot 6, and the plug-in assembly 9, the snap-in assembly 10, and the drive assembly 11 are arranged inside it. The recess 82 is arranged on the mounting block 7, the hook 84 is fixed to the bottom of the slot, and the plug-in slot 83 is arranged on the side wall. The drive assembly 11 is used to control the plug-in assembly 9 and the snap-in assembly 10 to be plugged into the slot and snapped into the hook 84, respectively.

[0038] In this embodiment of the application, the drive assembly 11 includes a rotating block 111, a connecting groove 112, a transmission groove 113, a transmission block 114, and a lever 115. The connecting groove 112 is disposed on the outer side wall of the fixed plate 4 and communicates with the inner cavity of the fixed shell 81. The rotating block 111 is rotatably installed in the inner cavity of the fixed shell 81, with the transmission groove 113 opened at its inner end, the lever 115 fixed on its peripheral wall, and the outer end is rotatably installed in the connecting groove 112 and a handle rod 116 is fixedly connected to its end face. The transmission block 114 is fixed on the plug-in assembly 9 and is in transmission cooperation with the transmission groove 113. The lever 115 is used to move the locking assembly 10 and the hook 84 to engage or disengage.

[0039] like Figures 1 to 8 As shown, due to the above structure, when it is necessary to fix the cutting disc 3, the cutting disc 3 is installed on the output shaft of the motor 2 through the spline and spline groove. Then, the through hole at the bottom of the fixing plate 4 is fitted onto the outer end of the output shaft of the motor 2. The mounting block 7 on the top of the fixing plate 4 is aligned with the mounting groove 6 and inserted. The fixing shell 81 is inserted into the recess 82. The hook 84 is aligned with the snap-fit ​​assembly 10. The handle rod 116 is turned to drive the rotating block 111 to rotate. The rotating block 111 drives the insertion block 92 in the insertion assembly 9 to move outward through the transmission groove 113 and the transmission block 114, so that its outer end is inserted into the insertion groove 83 of the mounting block 7, realizing the initial insertion positioning. The rotating block 111 continues to rotate, and the push block 115 on it rotates with it. The insertion block 92 maintains the insertion engagement with the insertion groove 83. The push block 115 pushes the snap-fit ​​assembly 10 to move and snap with the hook 84, realizing further clamping and fixing, thereby firmly installing the mounting block 7 in the mounting groove 6.

[0040] When it is necessary to remove the mounting block 7, rotate the handle rod 116 in the opposite direction. The lever 115 disengages from the locking assembly 10, the locking assembly 10 resets, and the locking with the hook 84 is released. Then, the transmission groove 113 drives the insert block 92 to move inward through the transmission block 114, so that it exits from the insertion groove 83, releasing the insertion engagement. The mounting block 7 can then be removed from the mounting groove 6.

[0041] The entire disassembly and assembly process is simple to operate and does not require additional tools, enabling quick disassembly and assembly of the mounting block 7, which in turn facilitates the replacement and maintenance of the motor 2 and the cutting disc 3.

[0042] Example 2:

[0043] The difference from Embodiment 1 is that, in this embodiment, in addition to including the structural features of the aforementioned embodiment, the inner end of the fixed shell 81 is provided with a pair of arc strips 12 concentric with the rotating block 111, and the inner end face of the rotating block 111 is provided with an annular groove 13 that slides with the arc strips 12.

[0044] In this embodiment of the application, the transmission groove 113 includes an eccentric section 1131 and a concentric section 1132 connected to each other. Both the eccentric section 1131 and the concentric section 1132 are arc-shaped. The two ends of the eccentric section 1131 are at different distances from the axis of the rotating block 111. The end farther from the axis of the rotating block 111 is connected to one end of the concentric section 1132. The concentric section 1132 is concentric with the axis of the rotating block 111.

[0045] like Figures 7 to 8 As shown, due to the above structure, the arc strip 12 at the inner end of the inner cavity of the fixed shell 81 slides with the annular groove 13 on the inner end face of the rotating block 111, which guides and limits the rotation of the rotating block 111, ensuring the concentricity and stability of the rotating block 111 during rotation, and preventing it from deviating or shaking during rotation.

[0046] The design of the eccentric section 1131 and concentric section 1132 of the transmission groove 113 allows the transmission block 114 to extend and retract under the action of the eccentric section 1131 during the rotation of the rotating block 111, thus enabling insertion or disengagement. When the transmission block 114 moves to the concentric section 1132, since the concentric section 1132 is concentric with the axis of the rotating block 111, the transmission block 114 will no longer drive the insertion block 92 to move as the rotating block 111 continues to rotate, thereby keeping the insertion block 92 in its current insertion or disengagement state. This facilitates the locking assembly 10 in locking or disengaging operations, making the entire operation process more orderly and reliable.

[0047] Example 3:

[0048] The difference from Embodiment 2 is that, in this embodiment, in addition to the structural features of the aforementioned embodiments, the plug-in assembly 9 includes a connecting shell 91, a plug block 92, and a connecting plate 93. The connecting shell 91 is fixed on the outer peripheral wall of the fixed shell 81 and its inner end communicates with the inner cavity of the fixed shell 81, while its outer end is open and aligned with the plug-in groove 83. The plug block 92 is slidably inserted into the connecting shell 91, with its inner end connected to the transmission block 114 through the connecting plate 93, and its outer end used for plugging into the plug-in groove 83.

[0049] In this embodiment of the application, the snap-fit ​​assembly 10 includes a through groove 101, a floating groove 102, a side groove 103, a push groove 104, a floating block 105, and a pressing block 106. The floating groove 102 passes through the insert block 92 from front to back, and the floating block 105 is floatingly installed therein. The through groove 101 is formed on the connecting shell 91 for inserting the snap hook 84 into the floating groove 102. The side groove 103 is located at the inner end of the insert block 92. The pressing block 106 is located at one end of the floating block 105 facing the through groove 101. The push groove 104 is located at the other end of the floating block 105. A triangular block 107 is fixed at the bottom of the push groove 104, and the inclined surface of the triangular block 107 faces the push block 115.

[0050] In the embodiments of this application, a pre-tensioning spring is provided between the side of the floating block 105 away from the through groove 101 and the bottom of the floating groove 102.

[0051] In this embodiment of the application, a retaining groove 108 is symmetrically provided on the inner sidewall of the floating groove 102. The retaining groove 108 is parallel to the axis of the rotating block 111. The floating block 105 is provided with a retaining groove 1091 that slides with the retaining groove 108.

[0052] like Figures 2 to 7 As shown, due to the above structure, during installation, the hook 84 extends from the through slot 101 into the floating slot 102. When the insert block 92 moves towards the insertion slot 83, the floating block 105 moves towards the hook 84. When the insert block 92 is inserted into the insertion slot 83, the transmission block 114 enters the concentric section 1132. The pressure block 106 moves to the top of the bent part at the bottom of the hook 84. When the push block 115 rotates with the rotating block 111 and contacts the inclined surface of the triangular block 107 in the push slot 104 on the floating block 105, it will push the floating block 105 to move in the floating slot 102 of the insert block 92, causing the pressure block 106 on the floating block 105 to descend and engage with the hook 84, thereby achieving the clamping and fixing of the mounting block 7.

[0053] During disassembly, the push block 115 rotates in the opposite direction along with the rotating block 111 to disengage from the triangular block 107. The floating block 105 resets under the action of the pre-tightening spring, causing the pressure block 106 to disengage from the hook 84. Then the insert block 92 retracts and disengages from the locking groove. Correspondingly, the pressure plate 5 also moves away from the hook 84, and the hook 84 can then disengage from the floating groove 102.

[0054] The retaining groove 108 on the inner wall of the floating groove 102 slides in conjunction with the retaining groove 1091 on the floating block 105, which guides and limits the movement of the floating block 105, ensuring the smoothness and accuracy of the movement of the floating block 105, preventing it from tilting or falling off during the movement, and ensuring the reliability of the snap-fit ​​assembly 10.

[0055] In the plug-in assembly 9, the connecting shell 91 provides a stable sliding guide for the plug 92. The plug 92 is connected to the transmission block 114 through the connecting plate 93, which ensures that the transmission block 114 can stably drive the plug 92 to slide within the connecting shell 91, so that the plug 92 can be accurately plugged into or separated from the plug-in slot 83.

[0056] Example 4:

[0057] The difference from Embodiment 3 is that, in this embodiment, in addition to including the structural features of the aforementioned embodiments, the bottom of the handle 116 is provided with a notch 117, a fixing block 118 with a shape adapted to the notch 117 is fixed on the outer wall of the fixing plate 4, and a sleeve 119 is floatingly sleeved on the outside of the handle 116. When the fixing block 118 and the notch 117 are engaged, the sleeve 119 can be sleeved on the outside of the fixing block 118.

[0058] In this embodiment of the application, a fixed protruding ring 1110 is fixedly provided on the top of the handle and a return spring 1111 is sleeved on the outside. A movable protruding ring 1112 is fixedly provided on the peripheral wall of the sleeve 119. The upper end and the lower end of the return spring 1111 abut against the opposing surfaces of the fixed protruding ring 1110 and the movable protruding ring 1112, respectively.

[0059] like Figures 1 to 5 As shown, due to the above structure, when the handle rod 116 is rotated to fix the mounting block 7 with the plug-in component 9 and the snap-fit ​​component 10, the notch 117 at the bottom of the handle rod 116 will engage with the fixing block 118 on the outer wall of the fixing plate 4. At this time, under the elastic force of the return spring 1111, the sleeve 119 will move downward and fit over the fixing block 118, firmly connecting the handle rod 116 and the fixing block 118 together, thereby locking the position of the handle rod 116 and preventing it from rotating accidentally due to vibration or other reasons during the operation of the device. This avoids the situation where the mounting block 7 becomes loose due to the accidental disengagement of the plug-in component 9 and the snap-fit ​​component 10, ensuring the stability and safety of the device operation.

[0060] When it is necessary to rotate the handle 116, pull the sleeve 119 upward to compress the return spring 1111, so that the sleeve 119 is disengaged from the fixing block 118, thereby releasing the lock on the handle 116 and facilitating rotation.

[0061] Example 5:

[0062] The difference from Embodiment 1 is that, in this embodiment, in addition to the structural features of the aforementioned embodiments, each of the plug slot 83, hook 84, plug component 9 and snap component 10 is provided in a pair, and the pair of plug components 9 and snap components 10 share a driving component 11.

[0063] like Figures 3 to 8 As shown, due to the above structure, a pair of insertion slots 83, hooks 84, insertion components 9 and snap-fit ​​components 10 are provided, and they share a single drive component 11. This allows for simultaneous insertion, positioning and snap-fit ​​fixing of the mounting block 7 from both sides, resulting in more uniform force distribution on the mounting block 7 and a more stable and reliable connection. This effectively prevents the mounting block 7 from shaking or shifting during operation.

[0064] Meanwhile, a pair of plug-in components 9 and snap-in components 10 share a single drive component 11, which simplifies the overall structure, reduces manufacturing difficulty, and ensures that the plug-in and snap-in actions on both sides can be performed synchronously, further improving the convenience and reliability of operation.

[0065] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0066] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A packaging film edge-cutting device, comprising a slider, a motor, and a cutting blade, characterized in that, It also includes a fixed plate, a pressure plate, a mounting groove, a mounting block, and a quick-release assembly. The slider has a mounting groove on one side and a fixed plate fixed at the bottom. The mounting block is detachably mounted in the mounting groove via the quick-release assembly and has a pressure plate fixed at the bottom. The pressure plate has a through hole at the bottom that is compatible with the motor output shaft. The cutting blade is mounted on the motor output shaft via a spline and a spline groove. The quick-release assembly includes a fixed shell, a recess, a plug-in slot, a hook, a plug-in assembly, a snap-in assembly, and a drive assembly. The fixed shell is fixed to the bottom of the mounting slot, and the plug-in assembly, snap-in assembly, and drive assembly are arranged inside it. The recess is arranged on the mounting block, the bottom of the recess is fixed with a hook, and the side wall is provided with a plug-in slot. The drive assembly is used to control the plug-in assembly and the snap-in assembly to plug into the slot and snap into the hook, respectively. The drive assembly includes a rotating block, a connecting groove, a transmission groove, a transmission block, and a lever. The connecting groove is located on the outer side wall of the fixed plate and communicates with the inner cavity of the fixed shell. The rotating block is rotatably installed in the inner cavity of the fixed shell, with a transmission groove at its inner end, a lever fixed on its peripheral wall, and a handle rod fixedly connected to its outer end in the connecting groove. The transmission block is fixed on the plug-in assembly and engages with the transmission groove. The lever is used to move the locking assembly and the hook to engage or disengage. The transmission groove includes an eccentric section and a concentric section connected to each other. Both the eccentric section and the concentric section are arc-shaped. The two ends of the eccentric section are at different distances from the axis of the rotating block. The end farther from the axis of the rotating block is connected to one end of the concentric section. The concentric section and the axis of the rotating block are concentric.

2. The packaging film edge-cutting device according to claim 1, characterized in that, The inner end of the fixed shell cavity is provided with a pair of arc strips concentric with the rotating block, and the inner end face of the rotating block is provided with an annular groove that slides with the arc strips.

3. The packaging film edge-cutting device according to claim 1, characterized in that, The plug-in assembly includes a connecting shell, a plug block, and a connecting plate. The connecting shell is fixed on the outer peripheral wall of the fixed shell and its inner end communicates with the inner cavity of the fixed shell, while its outer end is open and aligned with the plug-in slot. The plug block is slidably inserted into the connecting shell, with its inner end connected to the transmission block through the connecting plate and its outer end used for plugging into the plug-in slot.

4. The packaging film edge-cutting device according to claim 3, characterized in that, The snap-fit ​​assembly includes a through slot, a floating slot, a side slot, a pusher slot, a floating block, and a pressure block. The floating slot passes through the insert block from the front and back, and the floating block is floatingly installed therein. The through slot is opened on the connecting shell to allow the snap hook to be inserted into the floating slot. The side slot is located at the inner end of the insert block. The pressure block is located at the end of the floating block facing the through slot. The pusher slot is located at the other end of the floating block. A triangular block is fixed at the bottom of the pusher slot, and the inclined surface of the triangular block faces the pusher block.

5. A packaging film edge-cutting device according to claim 4, characterized in that, The inner wall of the floating groove is symmetrically provided with retaining grooves, which are parallel to the axis of the rotating block. The floating block is provided with a retaining slider that slides in cooperation with the retaining groove.

6. The packaging film edge-cutting device according to claim 1, characterized in that, The bottom of the handle rod has a notch, and a fixing block with a shape adapted to the notch is fixed on the outer wall of the fixing plate. A sleeve is floatingly sleeved on the outside of the handle rod, and the sleeve can be sleeved outside the fixing block when the fixing block is engaged with the notch.

7. A packaging film edge-cutting device according to claim 6, characterized in that, The top of the handle is fixed with a fixed protruding ring and the outside is sleeved with a return spring. The peripheral wall of the sleeve is fixed with a movable protruding ring. The upper and lower ends of the return spring abut against the opposing surfaces of the fixed protruding ring and the movable protruding ring, respectively.

8. A packaging film edge-cutting device according to any one of claims 1-3, characterized in that, Each of the plug slots, hooks, plug components, and snap-fit ​​components is provided in pairs, and each pair of plug components and snap-fit ​​components shares a single drive component.

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