Virtual cutting device of packaging machine

Abstract

The utility model provides a virtual cutting device of a packaging machine, which belongs to the technical field of film virtual cutting and comprises a fixing unit, a cutting unit, a film removing unit and a swinging unit, the fixing unit comprises a support and a connecting seat arranged on the support, and the support is used for being connected with a workbench; the cutting unit comprises a movable cutter rotationally connected to the support and a fixed cutter fixedly connected to the connecting base, the axis of the fixed cutter is parallel to the vertical direction, the axis of the movable cutter intersects with the axis of the fixed cutter, and a gap allowing a rolled film to pass through is formed between the movable cutter and the fixed cutter. The film retreating unit comprises a film retreating sheet arranged on the support in a sliding mode and a driving assembly connected to the film retreating sheet, the driving assembly is used for driving the film retreating sheet to move, and the film retreating sheet is used for separating the cut rolled film from the fixed cutter; the swing unit is connected to the movable cutter and used for driving the movable cutter to rotate around the axis of the movable cutter, so that the movable cutter has a cutting state in which the movable cutter is matched with the fixed cutter to extrude and cut the rolled film and a discharging state in which the movable cutter is separated from the fixed cutter. According to the utility model, the virtual cutting quality is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of film material slitting, specifically relating to a slitting device for a packaging machine. Background Technology

[0002] As a core component of horizontal packaging machines, the dot-cutting device functions to create uniform, discontinuous dot-line cuts on the roll film through the coordinated shearing action of the moving and fixed blades, thereby enabling the production of double-pack or multi-pack products.

[0003] However, during the actual cutting process, the teeth on the cutter can get into the roll of film, preventing the roll of film from detaching smoothly from the cutter. Currently, the mechanical pulling force of the subsequent film pulling action of the packaging machine is usually used to forcibly separate the film material, but this process is prone to causing local tearing of the roll of film or incomplete cuts, which reduces the quality of the cut. Utility Model Content

[0004] This utility model provides a dummy-cutting device for a packaging machine, which aims to solve the technical problem of low dummy-cutting quality caused by the film roll adhering to the blade when the moving blade retracts.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a cutting device for a packaging machine, comprising:

[0006] A fixing unit includes a support and a connecting seat disposed on the support, the support being used to connect to a workbench;

[0007] The cutting unit includes a movable blade rotatably connected to the support and a fixed blade fixed to the connecting seat. The axes of the fixed blades are parallel to the vertical direction, the axes of the movable blades intersect the axes of the fixed blades, and a gap is formed between the movable blades and the fixed blades for the film to pass through.

[0008] The film removal unit includes a film removal sheet disposed on the support and a driving assembly connected to the film removal sheet. The driving assembly is used to drive the film removal sheet to move, and the film removal sheet is used to separate the cut roll of film from the fixed blade.

[0009] A swing unit, connected to the moving blade, is used to drive the moving blade to rotate around its own axis, so that the moving blade has a cutting state in which it cooperates with the fixed blade to extrude and cut the roll film, and a material unloading state in which it separates from the fixed blade.

[0010] In one possible implementation, the moving blade includes a swing roller rotatably connected to the support and a cutting body connected to the swing roller. The swing roller rotates about its own central axis, and the swing unit is drivenly connected to the swing roller. The swing unit is used to drive the swing roller to rotate.

[0011] In one possible implementation, the fixing unit further includes a translation seat slidably connected to the support, the sliding direction of the translation seat being perpendicular to the rotation axis of the moving blade, and the diaphragm being fixedly connected to the translation seat;

[0012] The driving component includes:

[0013] The film-unwinding swing block is fixedly connected to the swing roller; and

[0014] The film removal lever has one end rotatably connected to the film removal swing block and the other end rotatably connected to the translation seat. The rotation axis of the film removal lever is parallel to the rotation axis of the moving knife.

[0015] In one possible implementation, the translation seat is fixedly connected to a reciprocating shaft, the axis of which is perpendicular to the rotation axis of the moving blade, and the connecting seat has a reciprocating hole through which the reciprocating shaft passes.

[0016] In one possible implementation, a linear bearing is provided between the reciprocating shaft and the inner wall of the reciprocating hole, and an oil seal is provided between the linear bearing and the reciprocating shaft.

[0017] In one possible implementation, the swing unit includes:

[0018] The telescopic component extends in a direction perpendicular to the rotation axis of the swing roller, and the fixed end of the telescopic component is fixed to the support.

[0019] The drive block is fixedly connected to the swing roller; and

[0020] The rotating roller has its axis parallel to the rotation axis of the moving blade. The rotating roller is rotatably connected between the driving swing block and the telescopic end of the telescopic component. The rotating roller rotates around its own central axis.

[0021] In one possible implementation, the telescopic end of the telescopic member is fixedly connected to a spherical bearing, and the rotating roller is disposed within the spherical bearing.

[0022] In one possible implementation, the connecting seat has a receiving groove for accommodating the fixed blade, the fixed blade is disposed in the receiving groove and fixedly connected to the connecting seat.

[0023] In one possible implementation, the connecting seat is further provided with a guide groove for accommodating the diaphragm strip, the diaphragm strip being slidably disposed within the guide groove.

[0024] In one possible implementation, the fixed blade has multiple cutting teeth along its own axial direction.

[0025] Compared with the prior art, the slitting device of the packaging machine provided by this utility model, after the moving blade completes the cutting, the swing unit drives it to reset and triggers the film ejector to slide in the horizontal direction through mechanical linkage. The film ejector pushes the roll film away from the fixed blade at the moment the moving blade disengages from the fixed blade, directly applying a physical pushing force to break the bonding force of the teeth on the fixed blade into the roll material, avoiding the tearing of the film material or incomplete cut caused by the subsequent film pulling process, thereby improving the slitting quality. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the cutting device of the packaging machine according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the connecting seat and reciprocating shaft used in an embodiment of this utility model.

[0028] Explanation of reference numerals in the attached figures:

[0029] 10. Fixed unit; 101. Support; 102. Connecting seat; 1021. Reciprocating hole; 1022. Receiving groove; 1023. Guide groove; 103. Translation seat; 1031. Reciprocating shaft;

[0030] 20. Cutting unit; 201. Moving blade; 2011. Swinging roller; 2012. Cutting body; 202. Fixed blade;

[0031] 30. Film removal unit; 301. Film removal sheet; 302. Film removal swing block; 303. Film removal pull rod;

[0032] 40. Swing unit; 401. Telescopic component; 4011. Joint bearing; 402. Drive block; 403. Rotary roller. Detailed Implementation

[0033] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0034] Please refer to the following: Figures 1 to 2This invention describes the cutting device of a packaging machine. The cutting device of a packaging machine includes a fixing unit 10, a cutting unit 20, a film removal unit 30, and a swing unit 40. The fixing unit 10 includes a support 101 and a connecting seat 102 disposed on the support 101, the support 101 being used to connect to a worktable. The cutting unit 20 includes a movable blade 201 rotatably connected to the support 101 and a fixed blade 202 fixedly connected to the connecting seat 102. The axes of the fixed blades 202 are parallel to the vertical direction. The axes of the movable blades 201 and the fixed blades 202 intersect, and the movable blades 201 and 202... A gap is formed between 202 for the roll film to pass through; the film removal unit 30 includes a film removal sheet 301 disposed on the support 101 and a drive assembly connected to the film removal sheet 301. The drive assembly is used to drive the film removal sheet 301 to move, and the film removal sheet 301 is used to separate the cut roll film from the fixed blade 202; the swing unit 40 is connected to the moving blade 201 and is used to drive the moving blade 201 to rotate around its own axis, so that the moving blade 201 has a cutting state of cooperating with the fixed blade 202 to squeeze and cut the roll film, and a material unloading state of separating from the fixed blade 202.

[0035] Optionally, the film release sheet 301 is slidably or rotatably connected to the support 101 to separate the film roll from the fixed blade 202. For example, the driving component is a motor connected to the film release sheet 301 to realize the rotation of the release sheet; or the driving component is a telescopic component, and the film release sheet 301 is slidable by the telescopic extension of the driving component.

[0036] It should be noted that the surface of the film removal sheet 301 has an antistatic coating; during the pushing process of the film removal sheet 301, the antistatic coating can locally neutralize the charge and further weaken the adsorption force.

[0037] In the initial state of the packaging machine's virtual cutting device provided in this embodiment, the moving blade 201 is separated from the fixed blade 202, and the film ejector 301 is horizontally retracted to a position away from the rear end of the fixed blade 202. The film roll passes through the gap between the moving blade 201 and the fixed blade 202 at a uniform speed. When the virtual cutting action is started, the oscillating unit 40 drives the moving blade 201 to switch to the cutting state. The cutting edge of the moving blade 201 gradually engages with the virtual teeth of the fixed blade 202, cutting the passing film roll to form a uniform, discontinuous virtual line cut. At this time, the film ejector 301 remains retracted to avoid interfering with the cutting area. After the moving blade 201 completes the cutting, the oscillating unit 40 immediately drives the moving blade 201 to reset and switch to the unloading state. At the moment when the moving blade 201 completely disengages from the fixed blade 202, the front end of the film ejector 301 contacts the film material, thereby pushing the film material away from the fixed blade 202. This process is repeated to achieve continuous cutting.

[0038] Compared with the prior art, after the moving blade 201 completes the cutting, the swing unit 40 drives it to reset and triggers the film release sheet 301 to slide in the horizontal direction through mechanical linkage. The film release sheet 301 pushes the roll film away from the fixed blade 202 at the moment the moving blade 201 disengages from the fixed blade 202, directly applying a physical pushing force to break the bonding force of the teeth on the fixed blade 201 into the roll film, avoiding the tearing of the film material or incomplete cut caused by the subsequent film pulling process, thereby improving the quality of the false cut.

[0039] In some embodiments, see Figure 1 The moving blade 201 includes a swing roller 2011 rotatably connected to the support 101 and a cutting body 2012 connected to the swing roller 2011. The swing roller 2011 rotates around its own central axis, and the swing unit 40 is used to drive the swing roller 2011 to rotate.

[0040] It should be noted that a rotating bearing is installed between the swing roller 2011 and the support 101.

[0041] The oscillating unit 40 drives the oscillating roller 2011 to rotate, causing the moving blade 201 to oscillate synchronously. As the core of power transmission, the oscillating roller 2011 evenly transmits the rotational torque to the entire length of the moving blade 201, ensuring that the cutting edge of the moving blade 201 accurately cuts into the gap between the teeth of the fixed blade 202, thereby shearing the passing roll film and forming intermittent cuts with consistent spacing. The rigid support structure of the oscillating roller 2011 eliminates the eccentric torque that may be generated by the independent oscillation of the moving blade 201, and avoids the contact surface between the cutting edge and the fixed blade 202 from shifting due to vibration, ensuring a constant shearing gap.

[0042] In some embodiments, see Figure 1 The fixing unit 10 also includes a translation seat 103 slidably connected to the support 101. The sliding direction of the translation seat 103 is perpendicular to the rotation axis of the moving blade 201. The film removal sheet 301 is fixedly connected to the translation seat 103. The driving assembly includes a film removal swing block 302 and a film removal pull rod 303. The film removal swing block 302 is fixedly connected to the swing roller 2011. One end of the film removal pull rod 303 is rotatably connected to the film removal swing block 302, and the other end is rotatably connected to the translation seat 103. The rotation axis of the film removal pull rod 303 is parallel to the rotation axis of the moving blade 201.

[0043] When the swing roller 2011 is driven to rotate by the swing unit 40, the film removal swing block 302 rotates synchronously around the same axis. The rotational motion of the film removal swing block 302 is converted into the linear sliding of the translation seat 103 through the film removal pull rod 303. As the swing roller 2011 drives the film removal swing block 302 to rotate clockwise or counterclockwise, the film removal pull rod 303 generates a projection change in the length direction based on geometric constraints, forcing the translation seat 103 to slide linearly back and forth in the horizontal direction perpendicular to the axis of the swing roller 2011, realizing the mechanical linkage between the advance and retreat of the film removal sheet 301 and the swing of the moving knife 201, without the need for an additional driving source.

[0044] Another variation of the drive assembly is that the drive assembly is a telescopic device. Specifically, the telescopic device can be a telescopic hydraulic cylinder, an electric cylinder, or a telescopic oil cylinder. The telescopic direction of the telescopic device is perpendicular to the rotation axis of the moving blade 201. The fixed end of the telescopic device is fixedly connected to the support 101, and the movable end of the telescopic device is fixedly connected to the film-unwinding sheet 301. The horizontal sliding of the film-unwinding sheet 301 is achieved by the telescopic movement of the telescopic device. However, using an additional power source, it is impossible to guarantee that the film-unwinding sequence is strictly synchronized with the movement of the moving blade 201.

[0045] In some embodiments, see Figure 2 The translation seat 103 is fixedly connected to a reciprocating shaft 1031, the axis of the reciprocating shaft 1031 is perpendicular to the rotation axis of the moving knife 201, and the connecting seat 102 has a reciprocating hole 1021 for the reciprocating shaft 1031 to pass through.

[0046] By rigidly connecting the translation seat 103 and the reciprocating shaft 1031 and guiding the reciprocating hole 1021 of the connecting seat 102, the horizontal sliding trajectory of the diaphragm 301 is forcibly limited to a single degree of freedom linear motion, eliminating the risk of offset or swaying caused by lateral force or inertia during the reciprocating motion of the translation seat 103. The design of the axis of the reciprocating shaft 1031 being perpendicular to the rotation axis of the moving blade 201 makes the forward and backward direction of the diaphragm 301 spatially orthogonal to the swing plane of the moving blade 201. The two movements do not interfere with each other and the mechanical transmission paths are independent, avoiding the attenuation of positioning accuracy caused by the coupling vibration of the mechanism.

[0047] In some embodiments, see Figure 2 A linear bearing is provided between the reciprocating shaft 1031 and the inner wall of the reciprocating hole 1021, and an oil seal is provided between the linear bearing and the reciprocating shaft 1031.

[0048] Linear bearings convert sliding friction into rolling friction, reducing driving resistance and wear. Meanwhile, the oil seal structure forms a dynamic seal at the root of the reciprocating shaft 1031, preventing linear bearing grease from leaking to the outside of the connecting seat 102, avoiding grease contamination of the film surface or the shearing area of ​​the fixed blade 202, and preventing external dust from entering the sliding pair and causing jamming.

[0049] In some embodiments, see Figure 1 The swing unit 40 includes a telescopic member 401, a driving swing block 402, and a rotating roller 403. The telescopic member 401 is perpendicular to the rotation axis of the swing roller 2011, and the fixed end of the telescopic member 401 is fixed to the support 101. The driving swing block 402 is fixed to the swing roller 2011. The axis of the rotating roller 403 is parallel to the rotation axis of the moving blade 201. The rotating roller 403 is rotatably connected between the driving swing block 402 and the telescopic end of the telescopic member 401, and the rotating roller 403 rotates around its own central axis.

[0050] Specifically, the telescopic end of the telescopic member 401 is fixedly connected to a spherical bearing 4011, and the rotating roller 403 is disposed inside the spherical bearing 4011.

[0051] It should be noted that the telescopic component 401 can be a telescopic oil cylinder, a hydraulic cylinder, or an electric cylinder.

[0052] In the initial state, the telescopic component 401 is in the retracted position, the driving swing block 402 and the swing roller 2011 are stationary, and the moving blade 201 is away from the fixed blade 202 and in standby mode. When the virtual cutting action begins, the telescopic component 401 extends in a direction perpendicular to the axis of the swing roller 2011. The telescopic end of the telescopic component 401 pushes the rotating roller 403 towards the driving swing block 402 through the spherical bearing 4011. During the compression process, the rotating roller 403 rotates freely around its own axis, converting the linear thrust into the torque that drives the swing block 402 to rotate around the axis of the swing roller 2011, forcing the swing roller 2011 to drive the moving blade 201 to swing towards the fixed blade 202 to perform shearing. After the moving blade 201 completes the shearing, the telescopic component 401 immediately retracts in the opposite direction, pulling the rotating roller 403 back away from the driving swing block 402. The rotating roller 403 rotates in the opposite direction and pulls the driving swing block 402 to rotate back, driving the swing roller 2011 and the moving blade 201 to quickly reset and disengage from the fixed blade 202.

[0053] The rotation of the roller 403 cancels the lateral component of the thrust of the telescopic component 401, while the spherical structure of the spherical bearing 4011 adaptively compensates for the small angular deviation between the drive swing block 402 and the telescopic end, ensuring that the power transmission is smooth.

[0054] Another variation of the oscillating unit 40 is that the oscillating unit 40 is a rotating component, specifically a rotary motor. The rotation direction of the oscillating roller 2011 is changed by changing the direction of rotation of the output shaft of the rotating component, thereby achieving reciprocating oscillation. However, the rotary motor relies on a precision reducer or gear set to transmit torque. The gear meshing backlash will accumulate into angular deviation during reciprocating oscillation, causing the reset position of the moving blade 201 to gradually drift, eventually leading to uneven cutting depth or misalignment of the teeth.

[0055] In some embodiments, see Figure 2 The connecting seat 102 has a receiving groove 1022 for accommodating the fixed blade 202. The fixed blade 202 is disposed in the receiving groove 1022 and is fixedly connected to the connecting seat 102.

[0056] A fastening plate is added to the side of the fixed blade 202 away from the connecting seat 102, and together with the connecting seat 102, they form a two-way rigid clamping structure for the fixed blade 202, completely eliminating the micro-displacement or warping deformation problem caused by alternating shear force in high-speed shearing when the fixed blade 202 is fixed on one side in the traditional single-sided fixing. The fastening plate and the connecting seat 102 are locked on both sides by a high-strength bolt group, so that the clamping force in the cutting edge area of ​​the fixed blade 202 is evenly distributed. Especially for the stress concentration area at the root of the virtual tooth of the moving blade 201, the double support structure transforms the cantilever beam force mode of the single-sided fixing into the simply supported beam mode, which greatly reduces the deflection deformation of the working section of the fixed blade 202 and avoids uneven cutting depth or virtual tooth breakage caused by local deformation of the fixed blade 202.

[0057] In some embodiments, see Figure 2 The connecting seat 102 is also provided with a guide groove 1023 for accommodating the diaphragm 301, and the diaphragm 301 is slidably disposed in the guide groove 1023.

[0058] When the translation seat 103 slides horizontally, the film release sheet 301 simultaneously passes through the clearance groove and pushes the film roll away from the fixed knife 202 from both sides of the fixed knife 202. The symmetrically distributed push applies a balanced peeling force, so that the film roll is released evenly, eliminating the film material twisting or stress concentration caused by torque imbalance during unilateral film release.

[0059] In some embodiments, the fixed blade 202 has a plurality of cutting teeth along its own axial direction.

[0060] The combination structure of a fixed cutter 202 with cutting teeth and a toothless moving cutter 201 overturns the traditional design pattern that the toothed cutter must be a moving part in the virtual cutting device. By fixing the cutter with virtual teeth as a fixed cutter 202, the thickness of the virtual tooth cutter body is increased. The characteristics of static installation of the fixed cutter 202 are used to strengthen the tooth root structure, improve the tool life, and save production costs.

[0061] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cutting device for a packaging machine, characterized in that, include: A fixing unit includes a support and a connecting seat disposed on the support, the support being used to connect to a workbench; The cutting unit includes a movable blade rotatably connected to the support and a fixed blade fixed to the connecting seat. The axis of the fixed blade is parallel to the vertical direction, the axis of the movable blade intersects the axis of the fixed blade, and a gap is formed between the movable blade and the fixed blade for the film to pass through. The film removal unit includes a film removal sheet disposed on the support and a driving assembly connected to the film removal sheet. The driving assembly is used to drive the film removal sheet to move, and the film removal sheet is used to separate the cut roll film from the fixed blade. as well as A swing unit, connected to the moving blade, is used to drive the moving blade to rotate around its own axis, so that the moving blade has a cutting state in which it cooperates with the fixed blade to extrude and cut the roll film, and a material unloading state in which it separates from the fixed blade.

2. The cutting device of the packaging machine as described in claim 1, characterized in that, The moving blade includes a swing roller rotatably connected to the support and a cutting body connected to the swing roller. The swing roller rotates around its own central axis. The swing unit is drivenly connected to the swing roller and is used to drive the swing roller to rotate.

3. The cutting device of the packaging machine as described in claim 2, characterized in that, The fixing unit further includes a translation seat slidably connected to the support, the sliding direction of the translation seat being perpendicular to the rotation axis of the moving blade, and the diaphragm being fixedly connected to the translation seat; The driving component includes: The film-unwinding swing block is fixedly connected to the swing roller; and The film removal lever has one end rotatably connected to the film removal swing block and the other end rotatably connected to the translation seat. The rotation axis of the film removal lever is parallel to the rotation axis of the moving knife.

4. The cutting device of the packaging machine as described in claim 3, characterized in that, The translation seat is fixedly connected to a reciprocating shaft, the axis of which is perpendicular to the rotation axis of the moving blade, and the connecting seat has a reciprocating hole through which the reciprocating shaft passes.

5. The cutting device of the packaging machine as described in claim 4, characterized in that, A linear bearing is provided between the reciprocating shaft and the inner wall of the reciprocating hole, and an oil seal is provided between the linear bearing and the reciprocating shaft.

6. The cutting device of the packaging machine as described in claim 2, characterized in that, The swing unit includes: The telescopic component extends in a direction perpendicular to the rotation axis of the swing roller, and the fixed end of the telescopic component is fixed to the support. The drive block is fixedly connected to the swing roller; and The rotating roller has its axis parallel to the rotation axis of the moving blade. The rotating roller is rotatably connected between the driving swing block and the telescopic end of the telescopic member. The rotating roller rotates around its own central axis.

7. The cutting device of the packaging machine as described in claim 6, characterized in that, The telescopic end of the telescopic component is fixedly connected to a spherical bearing, and the rotating roller is disposed within the spherical bearing.

8. The cutting device of the packaging machine as described in claim 1, characterized in that, The connecting seat has a receiving groove for accommodating the fixed blade, which is disposed in the receiving groove and fixedly connected to the connecting seat.

9. The cutting device of the packaging machine as described in claim 8, characterized in that, The connecting seat is also provided with a guide groove for accommodating the film removal sheet, and the film removal sheet is slidably disposed in the guide groove.

10. The cutting device of the packaging machine as described in claim 1, characterized in that, The fixed blade has multiple cutting teeth along its own axial direction.

Images