A packaging film cutting machine

Abstract

This invention relates to the field of packaging equipment technology and discloses a packaging film cutting machine, including a coarse adjustment component, a fine adjustment component, and a cutter. The coarse adjustment component includes a support plate, positioning rods, and a pitch-changing mechanism. The positioning rods are slidably connected to the surface of the support plate, and multiple positioning rods are spaced apart. The pitch-changing mechanism can synchronously adjust the distance between adjacent positioning rods. The fine adjustment component is located on the positioning rods and includes a housing and an adjustment mechanism. The adjustment mechanism includes a lead screw, a slider, and a guide rod. The guide rod is located on both sides of the lead screw, and the slider is threadedly connected to the lead screw and slidably connected to the guide rod. The cutter is disposed on the slider. Through the cooperation of the coarse and fine adjustment components, the coarse adjustment component is responsible for rapid and wide-range blade pitch changes, quickly approaching the target value first, and then the fine adjustment component performs fine correction, which can effectively improve the adjustment accuracy and efficiency.

Description

Technical Field

[0001] This invention belongs to the field of packaging equipment technology, and specifically relates to a packaging film cutting machine. Background Technology

[0002] Packaging film cutting machines are indispensable core equipment in flexible packaging production lines, used to longitudinally cut wide packaging materials into multiple narrow strips. Currently, there are three main cutting modes for packaging film cutting machines: upper and lower circular blade shearing, scraper-type slitting, and extrusion-type slitting. Among them, scraper-type slitting is the most widely used. Its working principle is as follows: the cutter is fixed on the blade holder, and the packaging film passes through the area below the cutter blade at high speed under the action of the traction mechanism. The cutter cuts the packaging film longitudinally, achieving the purpose of slitting.

[0003] To achieve various cutting sizes, the horizontal distance between adjacent cutting blades needs to be adjusted. Current technology typically employs a manually adjustable blade holder, where the cutter slides along a linear guide rail. The blade distance is adjusted by sliding the cutter along the rail and locking it in place. However, this method often suffers from the following technical problems: multiple cutters need to be adjusted individually, a cumbersome process lacking fine-tuning, resulting in low accuracy in blade distance adjustment. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a packaging film cutting machine to solve the technical problem that the existing technology requires individual adjustment of the cutting blades and lacks fine adjustment, resulting in low adjustment accuracy.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A packaging film cutting machine includes a coarse adjustment component, a fine adjustment component, and a cutter. The coarse adjustment component includes a support plate, positioning rods, and a pitch-changing mechanism. The positioning rods are slidably connected to the surface of the support plate, and multiple positioning rods are spaced apart. The pitch-changing mechanism can synchronously adjust the spacing between adjacent positioning rods. The fine adjustment component is located on the positioning rods and includes a housing and an adjustment mechanism. The adjustment mechanism includes a lead screw, a slider, and a guide rod. The extension direction of the lead screw is consistent with the sliding direction of the positioning rods. The lead screw is rotatably connected to the housing. The guide rods are located on both sides of the lead screw. The slider is threadedly connected to the lead screw and slidably connected to the guide rod. The cutter is disposed on the slider.

[0006] Furthermore, the pitch-changing mechanism includes a limiting protrusion, a sliding plate, and a cam groove. The sliding plate is located on the side of the positioning rod away from the support plate. The sliding plate is slidably connected to the support plate. The movement direction of the sliding plate is perpendicular to the movement direction of the positioning rod. The limiting groove is formed on the surface of the sliding plate. Multiple limiting grooves gradually slope from the middle to both sides and the angle with the horizontal plane gradually decreases. The limiting protrusion is set on one side of the positioning rod. The limiting protrusion corresponds to the limiting groove one by one, and the two are slidably connected.

[0007] Furthermore, the fine-tuning component also includes a power source and a transmission component. The power source is located on one side of the adjustment mechanism and includes a worm gear and a worm. The worm gear is rotatably connected to the housing via a rotating shaft. The rotating shaft extends in the same direction as the lead screw, and the worm extends to one side of the worm gear and meshes with the worm gear. The transmission component is located between the power source and the adjustment mechanism and includes a pulley and a transmission belt. The pulley corresponds to the worm gear and the lead screw and rotates synchronously. The transmission belt wraps around and is tensioned on the surface of the pulley.

[0008] Furthermore, it also includes a blade changing assembly, which is located in the mounting space at the bottom of the slider. The blade changing assembly includes a blade set and a switching mechanism. The blade set includes two cutters located in the same vertical plane and rotating coaxially. Each cutter is elastically constrained in the direction of rotation by a torsion spring. The two cutters are symmetrically distributed and their blades face each other. The switching mechanism is located above the blade set and connected to the blade set, and is used to move the cutters closer to or away from the packaging film.

[0009] Furthermore, a connecting shaft is provided within the installation space, and a connecting ring is fixedly connected to the cutter handle. The connecting ring is rotatably sleeved around the connecting shaft. A torsion spring is provided between the connecting ring and the side wall of the installation space. The torsion spring is sleeved around the connecting shaft, and the rotation of the cutter is elastically constrained by the torsion spring.

[0010] Furthermore, the switching mechanism includes a support component and a reversing component. The support component corresponds one-to-one with the cutter. The support component includes a limiting block, a support plate, a base, a spring, and a movable rod. The limiting block is located on one side of the cutter blade, the support plate is located on one side of the cutter back, the movable rod passes through the surface of the support plate, the base is located at the end of the movable rod near the cutter, the spring is located between the support plate and the base and is sleeved around the movable rod. The spring is always in a compressed state, and the end of the movable rod away from the base has an end head. The side of the end head facing the slider has a contact protrusion.

[0011] Furthermore, the side of the base facing the cutter is curved and forms a line contact with the back of the cutter.

[0012] Furthermore, the reversing component is located above the supporting component. The reversing component includes a reversing cylinder, a reversing block, a rotating shaft, and a reversing connecting rod. A trigger body is slidably connected inside the reversing cylinder. The reversing block corresponds one-to-one with the supporting component. The reversing block and the reversing cylinder are vertically slidably connected. The length of the trigger body is less than the distance between the two reversing blocks. The rotating shaft is located between the reversing block and the contact protrusion. The reversing connecting rod is rotatably connected to the rotating shaft. One end of the reversing connecting rod is hinged to the reversing block, and the other end of the reversing connecting rod acts at the angle between the contact protrusion and the end and abuts against the contact protrusion.

[0013] Furthermore, the power mechanism is located above the switching mechanism. The power mechanism includes a cylindrical cam, a sliding column, and a motor. A cam groove is provided on the outer circumferential surface of the cylindrical cam. The sliding column is fixedly connected to the trigger body. The sliding column passes through the reversing cylinder in the vertical direction and is slidably connected to the cam groove. The output shaft of the motor is coaxially fixedly connected to the cylindrical cam.

[0014] The beneficial effects of this invention are as follows: Compared with existing technologies, by using coarse adjustment components and fine adjustment components in conjunction, the coarse adjustment component is responsible for rapid and wide-range tool distance changes, quickly approaching the target value first, and then the fine adjustment component makes fine corrections, which can effectively improve adjustment accuracy and efficiency. In addition, it is simple to operate and can effectively reduce the labor intensity of workers. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 This is an overall schematic diagram of the packaging film cutting machine in Embodiment 1 of the present invention; Figure 2 for Figure 1 Enlarged view at point A1; Figure 3 This is a cross-sectional view of the packaging film cutting machine in Embodiment 1 of the present invention; Figure 4 for Figure 3 Enlarged view at point A2; Figure 5 for Figure 3 Enlarged view at point A3; Figure 6 This is a schematic diagram of the fine-tuning component in Embodiment 1 of the present invention; Figure 7 for Figure 5 Enlarged view at A4 in the middle; Figure 8 for Figure 7 Enlarged view at point A5 in the middle.

[0017] Figure label: Frame 1, Side plate 101, Coarse adjustment assembly 2, Bearing plate 201, Guide rail 202, Guide block 203, Positioning rod 204, Limiting protrusion 205, Slide plate 206, Limiting groove 207, Fixing plate 208, Cylinder 209 Fine-tuning component 3, housing 301, worm gear 302, worm 303, rotating shaft 304, lead screw 305, slider 306, pulley 307, transmission belt 308, guide rod 310, cutter 4, connecting shaft 401, connecting ring 402, traction component 5, drive roller 501, cutter groove roller 502, cutter changing component 6, limit block 601, support plate 602, base 603, spring 604, movable rod 605, end 606, contact protrusion 6061, reversing cylinder 607, reversing block 608, rotating shaft 609, reversing connecting rod 610, trigger body 611, cylindrical cam 612, sliding column 613, fixed rod 614, motor 615. Detailed Implementation

[0018] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0019] Example 1, specifically as follows Figures 1-8 As shown.

[0020] A packaging film cutting machine includes a frame 1, a coarse adjustment component 2, a fine adjustment component 3, and cutters 4. The coarse adjustment component 2 and the fine adjustment component 3 are both located inside the frame 1. The distance between adjacent cutters 4 is gradually adjusted by the coarse adjustment component 2 and the fine adjustment component 3.

[0021] like Figure 1 As shown, the frame 1 includes side plates 101, which are arranged vertically and at intervals facing each other, and the two side plates 101 are connected by connecting rods.

[0022] Coarse adjustment assembly 2 includes a support plate 201, a positioning rod 204, and a pitch-changing mechanism, such as... Figures 2-4 As shown, the support plate 201 is located between the two side plates 101. The support plate 201 is vertical, and its two ends in the length direction extend toward the plate surface of the two side plates 101 and are fixedly connected to the side plates 101.

[0023] The positioning rod 204 is located on one side of the bearing plate 201 and is slidably connected to the surface of the bearing plate 201 along the length direction of the bearing plate 201. Multiple positioning rods 204 are distributed at intervals along the length direction of the bearing plate 201. The positioning rod 204 extends along the width direction of the bearing plate 201 and has a square cross section. The cutter 4 is located at the bottom end of the positioning rod 204.

[0024] Specifically, a guide rail 202 is fixedly connected to the surface of the support plate 201. The guide rail 202 extends along the length of the support plate 201, and multiple guide rails 202 are distributed at intervals along the width of the support plate 201. A guide block 203 is fixedly connected to the upper middle part of the positioning rod 204 facing one side of the support plate 201. The guide block 203 is adapted to the guide rail 202, and the two are slidably connected.

[0025] The pitch-changing mechanism includes a limiting protrusion 205, a sliding plate 206, and a cam groove 207. The limiting protrusion 205 is located at the middle position of the side of the positioning rod 204 away from the bearing plate 201 in the width direction. The limiting protrusion 205 is located in the upper middle part of the positioning rod 204 and is cylindrical.

[0026] The slide plate 206 is located on the side of the positioning rod 204 away from the support plate 201, and the slide plate 206 is slidably connected to the support plate 201 along the width direction of the support plate 201. The sliding connection between the support plate 201 and the slide plate 206 is the same as the sliding connection between the positioning rod 204 and the support plate 201, which is achieved through the cooperation of the guide rail and the guide block, and will not be described in detail here.

[0027] A limiting groove 207 is formed on the surface of the slide plate 206 and extends through the slide plate 206 along its thickness direction. Multiple limiting grooves 207 are formed at intervals along the length direction of the support plate 201. The multiple limiting grooves 207 gradually slope from the middle to both sides, and the angle with the horizontal plane gradually decreases. The number of limiting grooves 207 is odd. The limiting groove 207 located in the middle position extends in the same direction as the width direction of the support plate 201, that is, the angle with the horizontal plane is 90°.

[0028] The limiting protrusion 205 is located within the limiting groove 207 and corresponds one-to-one with the limiting groove 207. The limiting protrusion 205 and the limiting groove 207 are slidably connected. By moving the slide plate 206 vertically, the limiting groove 207 abuts against the limiting protrusion 205 and pushes the limiting protrusion 205 and the positioning rod 204 to move horizontally, thereby changing the distance between adjacent positioning rods 204 and achieving coarse adjustment.

[0029] The fine-tuning component 3 is located at the bottom end of the positioning rod 204. The fine-tuning component 3 includes a housing 301, an adjustment mechanism, a power source, and transmission components. For example... Figure 5 As shown, the housing 301 is fixedly connected to the side of the positioning rod 204 away from the bearing plate 201, and the adjustment mechanism, power source and transmission components are all located in the cavity of the housing 301.

[0030] like Figure 5 , Figure 6As shown, the adjusting mechanism includes a lead screw 305, a slider 306, and a guide rod 310. The extension direction of the lead screw 305 is consistent with the sliding direction of the positioning rod 204, and both ends of the lead screw 305 are rotatably connected to the housing 301. The guide rod 310 is located on both sides of the lead screw 305 and extends in the same direction as the lead screw 305. The guide rod 310 is fixedly connected to the housing 301. The slider 306 is sleeved around the lead screw 305 and the guide rod 310. The slider 306 is threaded to the lead screw 305 and slidably connected to the guide rod 310. The slider 306 moves axially along the lead screw 305 by rotating the lead screw 305. A cutter 4 is located at the bottom of the slider 306, and the blade of the cutter 4 is in contact with the packaging film.

[0031] The power source is located on the side of the adjusting mechanism facing the positioning rod 204. The power source includes a worm gear 302 and a worm 303. The worm gear 302 is rotatably connected to the housing 301 via a rotating shaft 304. Specifically, the rotating shaft 304 extends in the same direction as the lead screw 305, and both ends of the rotating shaft 304 are rotatably connected to the housing 301. The worm gear 302 is sleeved around the rotating shaft 304 and fixed by a key connection. The worm 303 is located on the side of the worm gear 302 away from the adjusting mechanism. The worm 303 extends vertically and meshes with the worm gear 302. The top end of the worm 303 passes through the top of the housing 301 and protrudes. A screwdriver head is formed at the top end of the worm 303. The screwdriver head abuts against the housing 301 and provides vertical limitation for the worm 303.

[0032] The transmission component is located between the power source and the adjustment mechanism, transmitting the power generated by the power source to the adjustment mechanism. For example... Figure 6 As shown, the transmission component includes pulleys 307 and a transmission belt 308. There are two pulleys 307, which correspond to the worm gear 302 and the lead screw 305 respectively. The pulley 307 corresponding to the worm gear 302 is fixedly sleeved on the outer periphery of the rotating shaft 304, and the pulley 307 corresponding to the lead screw 305 is fixedly sleeved on the outer periphery of the lead screw 305. The transmission belt 308 is wrapped around and tensioned on the wheel surfaces of the two pulleys 307.

[0033] In use, rotating the screwdriver head causes the worm gear 303 to drive the worm wheel 302 to rotate, transmitting power to the lead screw 305 via the pulley 307 and transmission belt 308. The lead screw 305 then drives the slider 306 and the cutter 4 to move along the axial direction of the lead screw 305. Its precise lead allows for accurate adjustment of the tool pitch. Furthermore, due to the self-locking property of the worm gear 303 and worm wheel 302, the adjusted tool pitch can be stably maintained.

[0034] By coarse adjustment component 2 and fine adjustment component 3 working together, on the one hand, coarse adjustment component 2 is responsible for rapid and wide-range tool distance changes, quickly approaching the target value, and then fine adjustment component 3 makes fine corrections, so that the adjustment accuracy and adjustment efficiency can be greatly improved; on the other hand, the operation is simple and can effectively reduce the labor intensity of the staff.

[0035] like Figure 1 As shown, the traction assembly 5 includes a drive roller 501 and a grooved roller 502. The grooved roller 502 is located below the cutter. Multiple drive rollers 501 are distributed within the frame 1. The packaging film is wound around the roller surfaces of the drive rollers 501 and the grooved roller 502, and the drive rollers 501 provide traction for the packaging film. Grooves are distributed axially on the roller surface of the grooved roller 502, and the cutting edge can enter the grooves to cut the packaging film.

[0036] When the cutter is in continuous contact with the packaging film for an extended period, the blade becomes dull. The packaging film, especially composite films containing rigid fillers, has an abrasive microstructure. Long-term friction causes the blade to wear down, forming tiny bumps or notches, resulting in fraying and rough edges on the cut surface, affecting the subsequent use of the packaging film. On the other hand, the cutter heats up significantly, causing secondary tempering and reducing its hardness. This makes it unable to cut the packaging film thoroughly and effectively, resulting in rough cuts. Furthermore, the increased blade temperature causes the packaging film, which has a lower melting point, to melt and adhere to the cutter blade, severely impacting subsequent cutting accuracy and efficiency.

[0037] Based on this, a tool changing assembly 6 is also provided on the slider 306, which includes a tool set, a switching mechanism and a power mechanism.

[0038] like Figure 6 As shown, the bottom of the slider 306 has an installation space, and the installation space has openings on the bottom surface of the slider 306 and on both sides of the slider 306 in the width direction.

[0039] The cutter assembly is located within the installation space and includes two cutters 4 located in the same vertical plane and rotating coaxially. The two cutters 4 are symmetrically distributed with their cutting edges facing each other. The two cutters 4 can act on both sides of the cutter groove roller 502. Specifically, as shown... Figure 7 As shown, a connecting shaft 401 is provided at the bottom of the installation space along the thickness direction. Both ends of the connecting shaft 401 are fixedly connected to the side wall of the installation space. A connecting ring 402 is fixedly connected to the handle of the cutter 4. The connecting ring 402 is rotatably sleeved around the connecting shaft 401. A torsion spring is provided between the connecting ring 402 and the side wall of the installation space. The torsion spring is sleeved around the connecting shaft 401, and the rotation of the cutter 4 is elastically constrained by the torsion spring.

[0040] The switching mechanism is located above and connected to the blade assembly, and is used to move the two side cutters 4 closer to or away from the blade groove. The switching mechanism includes a support component and a reversing component, with the support component corresponding one-to-one with the two side cutters 4. Figure 8As shown, the support components include a limiting block 601, a support plate 602, a base 603, a spring 604, and a movable rod 605. The limiting block 601 is located on the side of the cutter 4 facing the blade of the groove roller 502 and is inclined. The two ends of the limiting block 601 are fixedly connected to the housing 301.

[0041] The support plate 602 is located on the back side of the cutter 4 away from the groove roller 502. Both ends of the support plate 602 are fixedly connected to the housing 301. In this embodiment, the tilt angle of the support plate 602 is consistent with the tilt degree of the limiting block 601. An elastic support is provided between the support plate 602 and the cutter 4 to elastically constrain the rotation of the cutter 4.

[0042] Specifically, the movable rod 605 passes through the surface of the support plate 602, and the two are slidably connected. The axis of the movable rod 605 is perpendicular to the surface of the support plate 602. The base 603 is fixedly connected to the end of the movable rod 605 near the cutter 4. The side of the base 603 facing the cutter 4 is curved and forms line contact with the back of the cutter 4. The spring 604 is located between the support plate 602 and the base 603 and is sleeved around the movable rod 605. The two ends of the spring 604 are welded and fixed to the support plate 602 and the base 603, respectively. It is worth emphasizing that the spring 604 is always in a compressed state.

[0043] The end of the movable rod 605 away from the base 603 is formed with an end head 606. A contact protrusion 6061 is formed on the side of the end head 606 facing the slider 306. The included angle between the contact protrusion 6061 and the movable rod 605 is less than 90°. The contact protrusion 6061 and the end head 606 are integrally formed.

[0044] The reversing component is located above the supporting component. Acting on the contact protrusion 6061, the reversing component can lift the movable rod 605 and the base 603, thereby releasing the elastic constraint on the cutter 4. Figure 7 As shown, the reversing component includes a reversing cylinder 607, a reversing block 608, a rotating shaft 609, and a reversing connecting rod 610. The reversing cylinder 607 is horizontal, and the axis of the reversing cylinder 607 is perpendicular to the axis of the lead screw 305.

[0045] A trigger body 611 is slidably connected to the internal space of the reversing cylinder 607. The trigger body 611 is cylindrical, and its diameter is the same as the inner diameter of the reversing cylinder 607. A sliding hole is provided at the bottom of the reversing cylinder 607. The reversing block 608 is vertical, and its extension direction is perpendicular to the axis of the reversing cylinder 607. The reversing block 608 passes through the sliding hole and forms a vertical sliding connection with the reversing cylinder 607. The reversing block 608 corresponds one-to-one with the support component. Limiting grooves (not shown in the figure) are also provided on both sides of the reversing block 608 in the width direction. The limiting grooves are fixedly connected to the reversing cylinder 607, and the vertical movement of the reversing block 608 is ensured by the limiting grooves. It is worth emphasizing that the length of the trigger body 611 is less than the distance between the two reversing blocks 608.

[0046] The rotating shaft 609 is located between the reversing block 608 and the contact protrusion 6061. The extension direction of the rotating shaft 609 is consistent with the extension direction of the lead screw 305, and both ends of the rotating shaft 609 are fixedly connected to the housing 301. The reversing connecting rod 610 is bent, and the rotating shaft 609 passes through the bend of the reversing connecting rod 610 and forms a rotatable connection with the reversing connecting rod 610. One end of the reversing connecting rod 610 is hinged to the bottom of the reversing block 608, and the other end of the reversing connecting rod 610 acts at the angle between the contact protrusion 6061 and the end 606 and abuts against the contact protrusion 6061. The reversing connecting rod 610 can provide support for the reversing block 608.

[0047] In the initial state, due to the elastic constraint of the torsion spring, there is a gap between the cutter 4 and the limiting block 601. The spring 604 pushes the cutter 4 to abut against the limiting block 601, and the two form a surface contact. At this time, the cutter 4 is in the working state, that is, the cutter 4 enters the blade groove and can cut the packaging film.

[0048] The trigger body 611 slides back and forth within the reversing cylinder 607. When the trigger body 611 contacts the reversing block 608 on one side, the reversing block 608 moves downward, causing the reversing linkage 610 to rotate. The rotation of the reversing linkage 610 will lift the contact protrusion 6061, the movable rod 605, and the base 603, causing the spring 604 to be further compressed. The base 603 has no interaction force with the cutter 4. The cutter 4 returns to its original position under the action of the torsion spring, that is, the cutter 4 moves away from the packaging film.

[0049] When the trigger 611 acts on one side of the reversing block 608, the corresponding cutter 4 is in a non-working state, while the other cutter 4 is in a working state. The trigger 611 alternately contacts the two reversing blocks 608, thereby realizing the alternating operation of the two cutters 4 and avoiding continuous contact between the cutter 4 and the packaging film. On the one hand, this can prevent the cutter blade from becoming dull, resulting in fraying or rough edges on the cut of the packaging film, which would affect the subsequent use of the packaging film; on the other hand, it can prevent the cutter from overheating, causing secondary tempering of the cutter, which would reduce the hardness of the cutter, making it impossible to cut the packaging film thoroughly and effectively, and preventing the packaging film from melting and adhering to the cutter blade, affecting the subsequent cutting accuracy and efficiency.

[0050] It is worth emphasizing that, considering that the packaging film moves from one side cutter 4 to the other side cutter 4, when the trigger body 611 is located between the two reversing blocks 608, both cutters 4 are in working condition, which can effectively avoid gaps during the switching process.

[0051] The power mechanism is located above the switching mechanism and is used to drive the trigger body 611 to reciprocate along the reversing cylinder 607. The power mechanism includes a cylindrical cam 612, a sliding column 613, a fixed rod 614, and a motor 615. The cylindrical cam 612 extends in the same direction as the reversing cylinder 607 and is located directly above the reversing cylinder 607. One end of the U-shaped fixed rod 614 is fixedly connected to the slider 306, and the other end of the fixed rod 614 is rotatably connected to the cylindrical cam 612, thereby providing support for the cylindrical cam 612. A cam groove is formed on the outer circumferential surface of the cylindrical cam 612. The sliding column 613 is fixedly connected to the top of the trigger body 611 and is adapted to the cam groove. The sliding column 613 passes vertically through the reversing cylinder 607 and is slidably connected to the cam groove. A limit opening is formed at the top of the reversing cylinder 607, and the sliding column 613 is slidably connected to the limit opening. The motor 615 is fixedly connected to the free end of the housing 301. The output shaft of the motor 615 passes through the housing 301 and is fixedly connected to the cylindrical cam 612 coaxially. The motor 615 drives the cylindrical cam 612 to rotate.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A packaging film cutting machine, characterized in that, Includes coarse adjustment components, fine adjustment components, and a cutter; The coarse adjustment component includes a support plate, positioning rods, and a pitch-changing mechanism. The positioning rods are slidably connected to the surface of the support plate, and multiple positioning rods are distributed at intervals. The pitch-changing mechanism can synchronously adjust the spacing between adjacent positioning rods. The fine-tuning component is located on the positioning rod. The fine-tuning component includes a housing and an adjustment mechanism. The adjustment mechanism includes a lead screw, a slider, and a guide rod. The extension direction of the lead screw is consistent with the sliding direction of the positioning rod. The lead screw is rotatably connected to the housing. The guide rod is located on both sides of the lead screw. The slider is threadedly connected to the lead screw and slidably connected to the guide rod. The cutter is mounted on the slider.

2. The packaging film cutting machine according to claim 1, characterized in that, The pitch-changing mechanism includes a limiting protrusion, a sliding plate, and a cam groove. The sliding plate is located on the side of the positioning rod away from the support plate. The sliding plate is slidably connected to the support plate. The movement direction of the sliding plate is perpendicular to the movement direction of the positioning rod. The limiting groove is formed on the surface of the sliding plate. Multiple limiting grooves gradually slope from the middle to both sides and the angle with the horizontal plane gradually decreases. The limiting protrusion is set on one side of the positioning rod. The limiting protrusion corresponds to the limiting groove one by one, and the two are slidably connected.

3. The packaging film cutting machine according to claim 2, characterized in that, The fine-tuning assembly also includes a power source and a transmission component. The power source is located on one side of the adjustment mechanism and includes a worm gear and a worm. The worm gear is rotatably connected to the housing via a rotating shaft. The rotating shaft extends in the same direction as the lead screw, and the worm extends to one side of the worm gear and meshes with the worm gear. The transmission component is located between the power source and the adjustment mechanism and includes a pulley and a transmission belt. The pulley corresponds to the worm gear and the lead screw and rotates synchronously. The transmission belt wraps around and is tensioned on the surface of the pulley.

4. The packaging film cutting machine according to claim 1, characterized in that, It also includes a tool changing assembly, which is located in the mounting space at the bottom of the slider, and the tool changing assembly includes a tool set and a switching mechanism; The blade assembly includes two cutting blades located in the same vertical plane and rotating coaxially. Each cutting blade is elastically constrained in the direction of rotation by a torsion spring. The two cutting blades are symmetrically distributed and their blades face each other. The switching mechanism is located above and connected to the blade assembly, and is used to move the cutter closer to or away from the packaging film.

5. The packaging film cutting machine according to claim 4, characterized in that, The installation space is equipped with a connecting shaft, and a connecting ring is fixedly connected to the cutter handle. The connecting ring is rotatably sleeved on the outside of the connecting shaft. A torsion spring is provided between the connecting ring and the side wall of the installation space. The torsion spring is sleeved on the outside of the connecting shaft, and the rotation of the cutter is elastically constrained by the torsion spring.

6. The packaging film cutting machine according to claim 4, characterized in that, The switching mechanism includes a support component and a reversing component. Each support component corresponds to a cutter. The support component includes a limiting block, a support plate, a base, a spring, and a movable rod. The limiting block is located on one side of the cutter's blade, the support plate is located on one side of the cutter's back, the movable rod passes through the surface of the support plate, the base is located at the end of the movable rod near the cutter, the spring is located between the support plate and the base and is sleeved around the movable rod, and the spring is always in a compressed state. The end of the movable rod away from the base has an end head, and the side of the end head facing the slider has a contact protrusion.

7. The packaging film cutting machine according to claim 6, characterized in that, The base has an arc surface on the side facing the cutter and forms a line contact with the back of the cutter.

8. The packaging film cutting machine according to claim 6, characterized in that, The reversing component is located above the supporting component. The reversing component includes a reversing cylinder, a reversing block, a rotating shaft, and a reversing connecting rod. A trigger body is slidably connected inside the reversing cylinder. The reversing block corresponds one-to-one with the supporting component. The reversing block and the reversing cylinder are vertically slidably connected. The length of the trigger body is less than the distance between the two reversing blocks. The rotating shaft is located between the reversing block and the contact protrusion. The reversing connecting rod is rotatably connected to the rotating shaft. One end of the reversing connecting rod is hinged to the reversing block, and the other end of the reversing connecting rod acts at the angle between the contact protrusion and the end and abuts against the contact protrusion.

9. The packaging film cutting machine according to claim 8, characterized in that, The power mechanism is located above the switching mechanism. The power mechanism includes a cylindrical cam, a sliding column, and a motor. A cam groove is provided on the outer circumferential surface of the cylindrical cam. The sliding column is fixedly connected to the trigger body. The sliding column passes through the reversing cylinder in the vertical direction and is slidably connected to the cam groove. The output shaft of the motor is coaxially fixedly connected to the cylindrical cam.

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