A packaging film slitting structure

Abstract

The present application relates to the technical field of slitting equipment, in particular to a packaging film slitting structure, which comprises a bearing frame and three guide rollers rotatably arranged on the inner side of the lower end of the bearing frame from right to left, a plurality of connecting units are slidably arranged on the bearing frame along the front-rear direction, and a straight knife is arranged on the connecting unit, the present application adopts roller frames to drive the compression rollers to continuously extrude the upper side of the film material, the displacement generated by the compression rollers with the change of the film material thickness is used to detect the thickness fluctuation of the film material in real time, the displacement signal is amplified by the transmission assembly and transmitted to the straight knife, the straight knife adjusts the film cutting angle according to the film thickness, when the film material is thin, the straight knife blade gradually moves vertically to the film material moving direction, the straight knife blade gradually faces the film material positively to reduce the pushing effect on the film material and avoid edge tearing, when the film material is thick, the straight knife blade is deflected to be approximately parallel to the film material moving direction, the cutting impact force is significantly reduced, and the edge quality of the film material is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of slitting equipment, in particular to a packaging film slitting structure. BACKGROUND

[0002] The packaging film is usually formed by co-extrusion or adhesive compounding of multi-layer functional film materials to form a base material, and then a pattern or logo is printed on the surface through a printing process. In order to meet the needs of downstream applications, the wide film material after compounding needs to be longitudinally slitted according to specific width specifications to form multiple rolls of narrow finished products. This process relies on the guide roller group in the slitting equipment to guide the film material to run, and the straight knife to complete the cutting. The cutting accuracy directly affects the edge quality and winding neatness of the film roll.

[0003] During the compounding and extrusion molding stage, due to the differences in the flowability of raw materials, the concentricity deviation of equipment rollers, or the fluctuation of process parameters, local thickness mutation areas may easily occur in the finished film material. Such thickness unevenness is difficult to completely avoid in high-speed continuous production, so that when the film material passes through the slitting station, the thickness fluctuation will significantly affect the cutting stability.

[0004] When the straight knife cuts into the thin area of the film material, the tensile strength of the material suddenly decreases, and the film material is prone to deformation when encountering the straight knife, causing the straight knife to change from shearing to downward pushing and tearing of the film material, resulting in stretching and even breaking of the film material edge. When cutting in the thick area, the straight knife is subjected to instantaneous impact load, and is prone to burrs or notches due to the sudden increase in cutting resistance.

[0005] The above cutting defects further cause the film layer misalignment, edge wrinkling or uneven tightness in the winding link, ultimately causing the decrease of finished product qualification rate and the increase of material loss. The traditional slitting structure lacks real-time response mechanism to the dynamic changes of film thickness, and it is difficult to effectively solve this problem. SUMMARY

[0006] In order to solve the above technical problems, the technical scheme adopted by the present application is: a packaging film slitting structure, comprising a bearing frame and three guide rollers rotatably arranged on the inner side of the lower end thereof from right to left, a plurality of connecting units are slidably arranged on the bearing frame along the front-rear direction, and a straight knife is arranged on the connecting unit.

[0007] The connecting unit comprises a moving frame slidably arranged on the bearing frame, a No. 1 knife seat is arranged on the lower left side of the moving frame through a buffer assembly, the lower side of the No. 1 knife seat is connected with the straight knife in a detachable manner, the straight knife is located between the left two adjacent guide rollers, a roller frame is slidably arranged on the lower side of the moving frame, and a pressure roller is rotatably arranged on the lower side of the roller frame.

[0008] The roller frame is connected with the buffer assembly through the transmission assembly arranged on the moving frame. When cutting the film, the compression roller abuts against the upper side of the film material. The thickness change of the film material is amplified and transmitted through the transmission assembly, so that the buffer assembly is driven by the transmission assembly and the film cutting angle of the straight knife is adjusted in real time according to the thickness of the film material.

[0009] Preferably, the roller frame is slidably connected with the moving frame through the columnar structure on the upper side of the roller frame. The screw spring is arranged between the upper side of the roller frame and the moving frame outside the columnar structure of the roller frame. The compression roller is located directly above the rightmost guide roller.

[0010] Preferably, the buffer assembly comprises a U-shaped frame rotatably arranged on the moving frame. The lower side of the transverse section of the U-shaped frame is slidably connected with the first knife seat in the left-right direction. The buffer spring is arranged between the left side of the first knife seat and the left vertical section of the U-shaped frame.

[0011] Preferably, the lower side of the left end of the moving frame is fixedly installed with a track groove plate through a supporting wall. The vertical section of the left part of the U-shaped frame is slidably arranged with a T-shaped rod in the left-right direction along the upper side of the vertical section. The left side of the T-shaped rod is slidably connected inside the slot of the track groove plate.

[0012] Preferably, the slot on the track groove plate is composed of two parts, the upper part of the slot is in a vortex line structure gradually away from the rotation axis of the U-shaped frame from bottom to top, and the lower part of the slot is in an arc structure coaxial with the rotation axis of the U-shaped frame.

[0013] Preferably, the transmission assembly comprises a driven gear fixedly installed at the position of the rotation axis of the U-shaped frame, and a lever rotatably arranged at the lower right end of the moving frame. The left end of the lever is fixedly installed with a gear section engaged with the left side of the driven gear. The middle part of the lever is provided with a waist-shaped slot. The roller frame is connected with the waist-shaped slot through the linkage column fixedly installed thereon.

[0014] Preferably, the moving frame is slidably arranged with a second knife seat above and corresponding to the position of the middle guide roller. The lower side of the second knife seat is fixedly installed with a cutting knife. The upper side of the moving frame is fixedly installed with a gas cylinder fixedly connected with the second knife seat. The lower side of the moving frame is fixedly installed with a distance sensor.

[0015] Preferably, the moving frame is slidably arranged with a sliding frame in the vertical direction. The lower end of the sliding frame is rotatably arranged with two front and back symmetrical arranged extrusion wheels. The sliding frame and the moving frame are provided with a return spring. The extrusion wheels are gradually inclined away from the straight knife from right to left.

[0016] Preferably, the moving frame is hingedly connected with a connecting rod. The right end of the connecting rod is located at the upper part of the second knife seat. The left end of the connecting rod is located at the upper part of the sliding frame.

[0017] Preferably, the inside of the bearing frame is rotationally provided with a shaft, and a plurality of knife holders are detachably connected to the shaft, the knife holders correspond to the straight knives one by one, and a cutting slot is formed in the middle of the knife holder, and a ceramic scraper is fixedly installed on the straight knife.

[0018] The present application has the following advantages: 1. The present application uses a roller frame to drive a compression roller to continuously extrude the upper side of the film material, the displacement of the compression roller caused by the change in the thickness of the film material is used to detect the thickness fluctuation of the film material in real time, and the displacement signal is amplified by a transmission assembly and transmitted to the straight knife, so that the straight knife adjusts the film cutting angle according to the thickness of the film material, when cutting the thin area of the film material, the straight knife blade gradually moves vertically to the moving direction of the film material, and the straight knife blade gradually faces the film material positively to reduce the pushing effect on the film material and avoid edge tearing, when cutting the thick area of the film material, the straight knife blade is deflected to be approximately parallel to the moving direction of the film material, which significantly reduces the cutting impact force, thereby improving the edge quality of the film material.

[0019] 2. The present application uses a T-shaped rod to move synchronously with the change of the angle of the straight knife, so that the T-shaped rod slides along the slot trajectory of the trajectory slot plate, when cutting the thick area, the T-shaped rod is separated from the first knife seat to form a buffer gap, and the buffer spring is combined to absorb the instantaneous impact of the film material on the straight knife, when cutting the thin area, the T-shaped rod tightly abuts against the first knife seat to lock the position of the first knife seat to enhance the cutting stability, thereby realizing the impact resistance control of rigid and flexible switching.

[0020] 3. The present application uses the cutting knife to adjust the position up and down according to the change of the angle of the straight knife, when cutting the thick area, the second knife seat moves downward to drive the cutting knife to pre-mark the cutting line on the film material, which significantly reduces the cutting resistance of the straight knife, at the same time, the straight knife is deflected to drive the ceramic scraper to contact the film edge to remove the burrs generated by cutting the thick area in real time, thereby forming a double quality guarantee mechanism of pre-cutting and burr cleaning.

[0021] 4. The present application uses the second knife seat to be mechanically linked with the sliding frame through a connecting rod, when cutting the thin area, the second knife seat moves upward and presses the sliding frame downward through the connecting rod, to drive the extrusion wheels arranged on both sides of the straight knife to press the film material, thereby applying a small amount of bidirectional pulling force to the film material away from the straight knife, which effectively offsets the pushing effect of the straight knife on the film, and effectively prevents the film edge from tearing. BRIEF DESCRIPTION OF DRAWINGS

[0022] The present application will be further described below in conjunction with the drawings and examples.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0024] Figure 2 It is a schematic diagram of the structure of the bearing frame, guide roller, moving frame and shaft in the present application.

[0025] Figure 3 It is a front view of the moving frame, straight knife, second knife seat and compression roller in the present application.

[0026] Figure 4 Figure 1 is a structural diagram of the knife holder roller, straight knife, driven gear and linkage column in the application.

[0027] Figure 5 Figure 2 is a structural diagram of the U-shaped frame, No. 1 knife seat, straight knife and T-shaped rod in the application.

[0028] Figure 6 Figure 3 is a structural diagram of the No. 2 knife seat, sliding frame, extrusion wheel and connecting rod in the application.

[0029] In the figure: 1, bearing frame; 2, guide roller; 3, connecting unit; 4, straight knife; 31, moving frame; 32, buffer assembly; 33, No. 1 knife seat; 34, roller frame; 35, compression roller; 36, transmission assembly; 37, No. 2 knife seat; 38, sliding frame; 39, shaft rod; 321, U-shaped frame; 322, track groove plate; 323, T-shaped rod; 361, driven gear; 362, lever; 363, gear segment; 364, linkage column; 371, cutting knife; 372, air cylinder; 373, distance sensor; 381, extrusion wheel; 382, connecting rod; 391, knife holder roller; 392, ceramic scraper. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below. The embodiments described below are exemplary only, and are intended to explain the present application, and are not to be understood as limiting the present application. If the specific technology or condition is not mentioned in the embodiments, the technology or condition described in the literature in the field or according to the product manual is used.

[0031] Referring to Figure 1 , Figure 2 and Figure 3 , a packaging film slitting structure includes a bearing frame 1, and three guide rollers 2 are rotatably arranged at the lower end of the inner side thereof from right to left, a plurality of connecting units 3 are slidably arranged on the bearing frame 1 in the front-rear direction, and a straight knife 4 is arranged on the connecting unit 3.

[0032] Referring to Figure 2 , Figure 3 and Figure 4 , a shaft rod 39 is rotatably arranged in the inner side of the bearing frame 1, and a plurality of knife holder rollers 391 are detachably connected to the shaft rod 39, the knife holder roller 391 corresponds to the straight knife 4 one by one, and a knife slot is formed in the middle of the knife holder roller 391.

[0033] It should be noted that, as Figure 1As shown, the carrier frame 1 is composed of two parts, the lower part is arranged in front and back two straight frame structure, the upper part is a longitudinal rod frame structure, and the longitudinal rod frame structure of the upper part is connected together up and down on the two straight frame structure of the lower part, the connecting unit 3 is slidably arranged on the longitudinal rod frame structure of the carrier frame 1, and the three guide rollers 2 and the shaft 39 are rotatably connected between the two straight frame structures.

[0034] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 5 , the connecting unit 3 includes a moving frame 31 slidably arranged on the carrier frame 1, the moving frame 31 is provided with a No. 1 tool holder 33 at the lower left side through a buffer assembly 32, the lower side of the No. 1 tool holder 33 is connected with a straight knife 4 in a detachable manner, the straight knife 4 is located between the left two adjacent guide rollers 2, the moving frame 31 is slidably arranged with a roller frame 34 at the lower side, the roller frame 34 is rotatably arranged with a pressure roller 35 at the lower side, and the roller frame 34 is connected with the buffer assembly 32 through a transmission assembly 36 arranged on the moving frame 31.

[0035] Referring to Figure 2 and Figure 3 , the roller frame 34 is slidably connected with the moving frame 31 through the columnar structure at the upper side, and the spiral spring is arranged between the moving frame 31 and the columnar structure outside the upper side of the roller frame 34, and the pressure roller 35 is located directly above the rightmost guide roller 2.

[0036] It should be noted that, in use, the two straight frame structures of the carrier frame 1 are fixedly installed on the existing slitting machine, and the straight frame structure and the longitudinal rod frame structure of the carrier frame 1 are connected through existing components capable of adjusting the position up and down, such as threaded rods or hydraulic cylinders, to realize the function of controlling the vertical distance between the moving frame 31 and the guide roller 2, and at this time the present application is located between the unwinding station and the winding station of the slitting machine.

[0037] It should be noted that, in the initial state, the roller frame 34 is fixedly connected with the moving frame 31 by means of a latch, which is not shown in the figure, so that at this time the blade of the straight knife 4 driven by the transmission assembly 36 and the buffer assembly 32 assumes a posture gradually inclined by 45 degrees to the right from bottom to top, and at this time the spiral spring is in a pre-compressed state.

[0038] It should be noted that the moving frame 31 can be fixedly connected with the carrier frame 1 by means of screw post abutting or clamping plate clamping, and in addition, the knife holder roller 391 is fixedly connected with the shaft 39 in the same way, so that after the operator manually adjusts the positions of the moving frame 31 and the knife holder roller 391, the moving frame 31 and the carrier frame 1 are fixed together, and the knife holder roller 391 and the shaft 39 are fixed together, which is a common technical means used by technicians in the field, and will not be described here.

[0039] When the film needs to be slitting, the operator manually moves the corresponding number of moving frames 31 and knife frame rollers 391 to the specified position according to the slitting position and quantity, and at the same time, the moving frame 31 always corresponds to the position of the straight knife 4 and the knife frame roller 391.

[0040] Then, the longitudinal rod frame structure of the carrying frame 1 is moved downward, so that the moving frame 31 drives the roller frame 34 to move downward, so that the roller frame 34 drives the compression roller 35 to move downward synchronously, until the minimum distance between the cylindrical surface of the compression roller 35 and the cylindrical surface of the corresponding guide roller 2 below it is equal to the reference thickness of the film, so that the thickness change of the film is detected by the up and down movement of the compression roller 35, and at this time, the cutting edge of the straight knife 4 extends into the inside of the knife slot corresponding to the knife frame roller 391, and the middle part of the cutting edge of the straight knife 4 horizontally corresponds to the middle position between the compression roller 35 and the guide roller 2, so that the cutting edge of the straight knife 4 contacts the film.

[0041] When the up and down position of the moving frame 31 is adjusted, the operator manually removes the pin between the roller frame 34 and the moving frame 31, so that the spiral spring pushes the roller frame 34 downward by the elastic force of its own pre-compression, so that the roller frame 34 drives the compression roller 35 to tightly contact the film, and the upper and lower sides of the film are clamped by the compression roller 35 and the rightmost guide roller 2, so that when the film moves, the thick area of the film pushes the compression roller 35 up, and the elastic force of the spiral spring pushes the compression roller 35 down in the thin area of the film.

[0042] Then manually pull the film out of the unwinding station, and around the upper parts of the three guide rollers 2, then connect the film to the winding station, at this time, the three guide rollers 2 push the film upward, realizing the effect that the lower side of the film is tightly attached to the cylindrical surface of the three guide rollers 2, and the lower side of the film is tightly attached to the cylindrical surface of the knife frame roller 391, so that the straight knife 4 is inserted and penetrates the film, so as to slit the film.

[0043] It should be noted that the three guide rollers 2 and the shaft 39 are connected with the existing slitting machine drive unit through the belt, so that the three guide rollers 2 and the shaft 39 rotate synchronously counterclockwise with the movement of the film.

[0044] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 5 , the buffer assembly 32 includes a U-shaped frame 321 rotatably arranged on the moving frame 31, and the lower side of the horizontal section of the U-shaped frame 321 is slidably connected with the first knife seat 33 in the left-right direction, and the left side of the first knife seat 33 and the left vertical section of the U-shaped frame 321 are provided with a buffer spring.

[0045] Referring to Figure 1 ,Figure 3 and Figure 4 The transmission assembly 36 includes a driven gear 361 fixedly installed at the rotating axis position of the U-shaped frame 321, and a lever 362 rotatably arranged at the lower right end of the moving frame 31, the left end of the lever 362 is fixedly installed with a gear segment 363 engaged with the left side of the driven gear 361, the middle part of the lever 362 is provided with a waist-shaped slot, and the roller frame 34 is matched with the waist-shaped slot through the linkage column 364 fixedly installed thereon.

[0046] In the initial state, the roller frame 34 pushes the lever 362 to a horizontal posture through the linkage column 364, when the film material passes through the three guide rollers 2 to the winding station, the slitting machine is started to move the film material, and the three guide rollers 2 are synchronously counterclockwise rotated with the shaft rod 39, the shaft rod 39 drives the cutter holder roller 391 on it to rotate synchronously, the cutter holder roller 391 supports the lower side of the film material in the area of the straight knife 4, preventing the unstable phenomenon that the film material moves up and down under the pushing of the straight knife 4, the film material quickly moves to the left at the position of the three guide rollers 2, and at the same time, the straight knife 4 cuts the film material through the continuous contact of the blade thereon with the film material.

[0047] When the thicker area of the film material moves to the position of the rightmost guide roller 2, the height position of the guide roller 2 cannot be changed because the guide roller 2 is connected with the rack of the slitting machine through the straight plate frame structure of the bearing frame 1, so that the thicker film material pushes up the compression roller 35, the compression roller 35 drives the roller frame 34 to move upward relative to the moving frame 31, and the roller frame 34 pushes the left end of the lever 362 to deflect upward through the linkage column 364.

[0048] Because the rotating axis of the lever 362 is located at the right part of the roller frame 34, the up-down movement amount of the left end of the lever 362 is greater than that of the lever 362 located at the waist-shaped slot position, so as to realize the amplification of the upward movement amount of the compression roller 35, and then the lever 362 drives the gear segment 363 to deflect synchronously, so that the gear segment 363 drives the driven gear 361 to rotate clockwise, and because the pitch circle diameter of the gear segment 363 is greater than that of the driven gear 361, the rotating angle of the gear segment 363 is smaller than that of the driven gear 361, so the driven gear 361 amplifies the upward movement amount of the compression roller 35 twice, and thus can accurately monitor the slight thickness change of the film material.

[0049] The clockwise rotating driven gear 361 drives the straight knife 4 to deflect to the left upper part through the U-shaped frame 321 and the No. 1 knife seat 33, so that the blade of the straight knife 4 gradually deflects to approach parallel to the direction of the film material movement, thereby significantly reducing the impact force of the straight knife 4 cutting into the film material, thereby improving the edge quality of the film material, and vice versa, when the thinner area of the film material moves to the position of the rightmost guide roller 2, the blade of the straight knife 4 gradually deflects to be perpendicular to the direction of the film material movement, so that the blade of the straight knife 4 gradually faces the film material positively to reduce the pushing effect of the straight knife 4 on the film material, and avoid edge tearing.

[0050] Referring to Figure 3 , Figure 4 and Figure 5 , the trajectory groove plate 322 is fixedly installed on the lower side of the left end of the mobile frame 31 through a supporting wall, and the vertical segment of the left part of the U-shaped frame 321 is slidably provided with a T-shaped rod 323 in the left-right direction, and the left side of the T-shaped rod 323 is slidably connected inside the slot of the trajectory groove plate 322.

[0051] Referring to Figure 3 and Figure 5 , the slot on the trajectory groove plate 322 is composed of two parts, the upper part of the slot is in a vortex line structure gradually away from the rotation axis of the U-shaped frame 321 from bottom to top, and the lower part of the slot is in an arc structure coaxial with the rotation axis of the U-shaped frame 321.

[0052] In the initial state, the left part of the T-shaped rod 323 is located at the position where the upper and lower parts of the slot of the trajectory groove plate 322 are connected, and the buffer spring pushes the first tool holder 33 to the right by its own elastic force, so that the first tool holder 33 abuts against the vertical segment of the right part of the U-shaped frame 321, and the right end of the T-shaped rod 323 abuts against the first tool holder 33.

[0053] When the straight knife 4 is deflected clockwise, the first tool holder 33 drives the T-shaped rod 323 to move upward along the vortex line structure of the slot of the trajectory groove plate 322, so that the T-shaped rod 323 gradually moves away from the first tool holder 33, thereby forming a buffer gap between the T-shaped rod 323 and the first tool holder 33. The instantaneous impact of the film material moving to the left on the straight knife 4 can push the straight knife 4 and the first tool holder 33 to compress the buffer spring, so that the buffer spring absorbs the instantaneous impact of the film material on the straight knife 4, reduces the impact force, and effectively avoids burrs on the film edge.

[0054] It should be noted that the gap between the T-shaped rod 323 and the first tool holder 33 changes with the deflection angle of the straight knife 4, that is, the thicker the film material contacted by the straight knife 4, the larger the gap between the T-shaped rod 323 and the first tool holder 33, and the longer the buffer distance of the straight knife 4, so that the film material in the thick area can always push the straight knife 4 to drive the first tool holder 33 to abut against the T-shaped rod 323, and the buffer spring is only used to absorb the instantaneous impact of the film material on the straight knife 4, thereby ensuring the stability of the straight knife 4 when cutting the film material in the thick area.

[0055] When the straight knife 4 is deflected counterclockwise, the first tool holder 33 drives the T-shaped rod 323 to move downward along the arc structure of the slot of the trajectory groove plate 322, so that the position of the T-shaped rod 323 relative to the first tool holder 33 remains unchanged, thereby locking the position of the first tool holder 33 by abutting the T-shaped rod 323 to enhance the stability when cutting the film material in the thin area.

[0056] Referring to Figure 4 and Figure 5The ceramic scraping plate 392 is fixedly installed on the straight knife 4, and the front and rear sides of the ceramic scraping plate 392 are slightly protruded from the straight knife 4. The front and rear sides of the ceramic scraping plate 392 are relatively rough.

[0057] When the straight knife 4 is counterclockwise deflected or the straight knife 4 is not deflected, the ceramic scraping plate 392 on the straight knife 4 is located at the lower part of the film material, so as to prevent the ceramic scraping plate 392 from contacting the film edge. When the straight knife 4 is clockwise deflected, the ceramic scraping plate 392 is moved to the position of the film edge, so that the film edge of the moving film material rubs against the front and rear sides of the ceramic scraping plate 392, thereby removing burrs generated when the straight knife 4 cuts the thick area of the film material.

[0058] Referring to Figure 3 and Figure 6 The second knife seat 37 is slidably arranged on the moving frame 31 and corresponds to the position of the guide roller 2 at the middle part. The second knife seat 37 is fixedly installed with a cutting knife 371 at the lower side. The moving frame 31 is fixedly installed with a gas cylinder 372 at the upper side, and the gas cylinder 372 is fixedly connected with the second knife seat 37. The moving frame 31 is fixedly installed with a distance sensor 373 at the lower side, and the distance sensor 373 corresponds to the left end of the lever 362.

[0059] When the left end of the lever 362 moves upward, the distance sensor 373 detects that the lever 362 gradually approaches the moving frame 31, and then the telescopic section of the gas cylinder 372 is extended, so that the gas cylinder 372 pushes the second knife seat 37 downward, and the second knife seat 37 drives the cutting edge of the cutting knife 371 to contact the film material, but the cutting knife 371 does not penetrate the film material, so that the cutting knife 371 pre-draws a separation line on the film material, thereby significantly reducing the resistance when the straight knife 4 cuts into the film material, and further reducing the phenomenon that burrs are generated on the edge of the film material due to impact.

[0060] It should be noted that, compared with the driving mode of the hydraulic cylinder or the electric cylinder, the driving mode of the gas cylinder 372 can more quickly move the up-down position of the cutting knife 371, so as to quickly respond to the thickness change of the film material.

[0061] It should be further noted that the distance sensor 373 transmits the signal of the detected position of the lever 362 to the existing controller, such as a single-chip microcomputer or a PLC, and then the controller sends an instruction to the air pump, so as to control the telescopic section of the gas cylinder 372. Such electrical connection and control method is a common technical means for those skilled in the art, and will not be described herein.

[0062] Referring to Figure 2 , Figure 3 and Figure 6The moving frame 31 is vertically slidably provided with a sliding frame 38, and the lower end of the sliding frame 38 is rotatably provided with two front and back symmetrical extrusion wheels 381. A return spring is arranged between the sliding frame 38 and the moving frame 31, and the extrusion wheels 381 gradually incline away from the straight knife 4 from right to left.

[0063] Referring to Figure 3 and Figure 6 The moving frame 31 is vertically slidably provided with a sliding frame 38, and the lower end of the sliding frame 38 is rotatably provided with two front and back symmetrical extrusion wheels 381. A return spring is arranged between the sliding frame 38 and the moving frame 31, and the extrusion wheels 381 gradually incline away from the straight knife 4 from right to left.

[0064] In the initial state, the return spring overcomes the gravity of the sliding frame 38 and the extrusion wheels 381 by its own elastic force, so that the extrusion wheels 381 do not contact the film material in the initial state. When the left end of the lever 362 moves upward, the second knife holder 37 moves downward, so that the extrusion wheels 381 maintain the state of not contacting the film material at this time.

[0065] When the left end of the lever 362 moves downward, the air cylinder 372 drives the second knife holder 37 to move upward, so that the second knife holder 37 drives the cutting knife 371 to move upward to no longer contact the film material. When the pressure roller 35 encounters a relatively thin area of the film material, the left end of the lever 362 continues to move downward, and the air cylinder 372 drives the second knife holder 37 to move upward to the upper part of the initial position of the second knife holder 37.

[0066] This makes the second knife holder 37 push the right end of the connecting rod 382 upward, so that the left end of the connecting rod 382 presses the sliding frame 38 downward, and the sliding frame 38 drives the extrusion wheels 381 to extrude on the upper side of the film material. At the same time, the extrusion wheels 381 cooperate with the knife holder rollers 391 corresponding to the lower part of the extrusion wheels 381 to clamp the film material, which makes the film material rotate by the friction force of the extrusion wheels 381. The inclined arrangement of the extrusion wheels 381 can guide the film material to a certain extent when rotating, so that the extrusion wheels 381 arranged on both sides of the straight knife 4 exert a small amount of bidirectional pulling force on the film material away from the straight knife 4, effectively offsetting the pushing effect of the straight knife 4 on the film, and effectively preventing the film edge from tearing.

[0067] It should be noted that the small amount of bidirectional pulling force exerted by the extrusion wheels 381 on the film material is intended to make the film material have a tendency to move away from the straight knife 4, preventing the straight knife 4 from pushing the film material to produce downward extrusion bending. Since the film material in the embodiment is a packaging film composed of multiple materials, it has strong tensile resistance, which is sufficient to prevent the extrusion wheels 381 from stretching the film material, thereby effectively preventing the problem of wrinkles.

[0068] It should be noted that the distance between the pressure roller 35 and the straight knife 4 is close, and the moving speed of the film material on the slitting machine is fast, combined with the meshing gap between the driven gear 361 and the gear segment 363, after the adjustment of the person skilled in the art, when the pressure roller 35 detects the thickness of the film material and feeds back to the straight knife 4, the film material originally located at the position of the pressure roller 35 has moved to the position of the straight knife 4, so as to achieve the function of dynamically adjusting the angle of the straight knife 4 when cutting the film material according to the thickness of the film material.

[0069] Referring to Figures 1 to 6 , the present application also includes the following steps when slitting the film material: first, the operator moves a corresponding number of moving frames 31 and knife frame rollers 391 to the designated position, then the operator lowers the pressure roller 35, so that the minimum distance between the pressure roller 35 and the corresponding guide roller 2 is equal to the reference thickness of the film material.

[0070] Second, the operator manually removes the pin between the roller frame 34 and the moving frame 31, so that the spiral spring drives the pressure roller 35 to abut against the film material, then manually pulls the film material out of the unwinding station, and then winds around the upper part of the three guide rollers 2, then connects the film material to the winding station.

[0071] Third, start the slitting machine to move the film material, and the straight knife 4 cuts the film material, when the pressure roller 35 encounters the thick area of the film material, the left end of the lever 362 is upwardly deflected, so that the air cylinder 372 pushes the cutter 371 downward to pre-mark the cutting line on the film material, which significantly reduces the resistance when the straight knife 4 cuts into the film material.

[0072] Fourth, the lever 362 drives the straight knife 4 blade to gradually deflect to approach parallel to the direction of movement of the film material through the No. 1 knife seat 33, which significantly reduces the impact force of the straight knife 4 cutting into the film material.

[0073] Fifth, the straight knife 4 drives the ceramic scraper 392 to move to the position of the film edge, so that the moving film material drives its film edge to rub against the front and back sides of the ceramic scraper 392, thereby removing the burrs generated when the straight knife 4 cuts the thick area of the film material.

[0074] Sixth, the U-shaped frame 321 drives the T-shaped rod 323 to move upward along the spiral line structure of the slot of the track slot plate 322, so that the T-shaped rod 323 is separated from the No. 1 knife seat 33 to form a buffer gap, so that the buffer spring absorbs the instantaneous impact of the film material on the straight knife 4, effectively avoiding burrs on the film edge.

[0075] Seventh, when the pressure roller 35 encounters the thin area of the film material, the left end of the lever 362 is downwardly deflected, and the straight knife 4 blade is gradually deflected to be perpendicular to the direction of movement of the film material, so that the straight knife 4 blade gradually faces the film material in a positive direction, to reduce the pushing action of the straight knife 4 on the film material and avoid edge tearing.

[0076] In the eighth step, the second knife holder 37 is driven upward by the cylinder 372, so that the second knife holder 37 drives the extruding wheel 381 to abut against the film material and guide the film material to a certain extent through the connecting rod 382, thereby exerting a small amount of bidirectional pulling force on the film material away from the straight knife 4, effectively offsetting the pushing effect of the straight knife 4 on the film, and effectively preventing the film edge from being torn.

[0077] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0078] In addition, the terms "first", "second", "one", "two" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second", "one", "two" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0079] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0080] The embodiments of the specific implementation are the preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore; any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A packaging film slitting structure comprising a support frame, and three guide rollers disposed at the lower end of the inner side thereof in a right-to-left rotation, characterized in that, A plurality of connection units are arranged on the bearing frame and slide in the front-rear direction, and a straight knife is arranged on the connection unit; The connection unit comprises a moving frame arranged on the bearing frame and sliding in the front-rear direction, a No. 1 knife seat is arranged on the lower left side of the moving frame through a buffer assembly, the lower side of the No. 1 knife seat is connected with the straight knife in a detachable manner, the straight knife is located between the two adjacent guide rollers on the left side, a roller frame is arranged on the lower side of the moving frame and slides up and down, and a pressure roller is rotatably arranged on the lower side of the roller frame; The roller frame is connected with the buffer assembly through a transmission assembly arranged on the moving frame, when the film is cut, the pressure roller abuts against the upper side of the film material, the thickness change of the film material is amplified and transmitted through the transmission assembly, the buffer assembly is driven by the transmission assembly, and the film cutting angle of the straight knife is adjusted in real time according to the thickness of the film material; The buffer assembly comprises a U-shaped frame rotatably arranged on the moving frame, the lower side of the transverse section of the U-shaped frame is connected with the No. 1 knife seat and slides in the left-right direction, and a buffer spring is arranged between the left side of the No. 1 knife seat and the left vertical section of the U-shaped frame; The transmission assembly comprises a driven gear fixedly installed at the position of the rotation axis of the U-shaped frame, and a lever rotatably arranged at the right end of the lower side of the moving frame, a gear section meshing with the left side of the driven gear is fixedly installed at the left end of the lever, a waist-shaped groove is formed in the middle part of the lever, and the roller frame is matched with the waist-shaped groove through a linkage column fixedly installed thereon; The lower side of the left end of the moving frame is fixedly installed with a track groove plate through a supporting wall, a T-shaped rod is arranged on the vertical section of the left part of the U-shaped frame and slides in the left-right direction, and the left side of the T-shaped rod is connected in the slot of the track groove plate; The slot on the track groove plate is composed of two parts, the upper part of the slot is in a vortex line structure gradually away from the rotation axis of the U-shaped frame from bottom to top, and the lower part of the slot is in an arc structure coaxial with the rotation axis of the U-shaped frame; A No. 2 knife seat is arranged on the moving frame and slides up and down at a position corresponding to the middle part of the guide roller, a cutting knife is fixedly installed on the lower side of the No. 2 knife seat, a cylinder fixedly connected with the No. 2 knife seat is fixedly installed on the upper side of the moving frame, and a distance sensor is fixedly installed on the lower side of the moving frame.

2. The packaging film slitting structure according to claim 1, wherein The roller frame is connected with the moving frame through the columnar structure on the upper side of the roller frame, a spiral spring is arranged between the upper side of the roller frame and the moving frame and located outside the columnar structure of the roller frame, and the pressure roller is located directly above the rightmost guide roller.

3. The packaging film slitting structure according to claim 1, wherein A sliding frame is arranged on the moving frame and slides in the vertical direction, two front-rear symmetrical arranged extrusion wheels are rotatably arranged on the lower end of the sliding frame, a return spring is arranged between the sliding frame and the moving frame, and the extrusion wheels gradually tilt away from the straight knife from right to left.

4. The packaging film slitting structure according to claim 3, wherein A connecting rod is hingedly connected to the upper side of the moving frame, the right end of the connecting rod is located on the upper part of the No. 2 knife seat, and the left end of the connecting rod is located on the upper part of the sliding frame.

5. The packaging film slitting structure according to claim 3, wherein An axle is rotatably arranged on the inner side of the bearing frame, a plurality of knife holder rollers are connected with the axle in a detachable manner, the knife holder rollers correspond to the straight knives one by one, a knife slot is formed in the middle part of the knife holder roller, and a ceramic scraper is fixedly installed on the straight knife.

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