A BOPP film edge shaping device

Abstract

The invention discloses a BOPP film edge shaping device, which relates to the field of cutting technology; in order to solve the problem of smooth incision; specifically comprises a frame, the inner wall of the frame is respectively connected to an upper cutting roller through an upper cutting shaft, and is connected to a lower cutting roller matched with the upper cutting roller through a lower cutting shaft, a cutting knife is fixed to the outer wall of the end of the upper cutting roller, and a knife groove matched with the cutting knife is provided on the inner wall of the lower cutting roller; the inner side wall of the frame is connected to a winding roller 2 through a winding shaft 2. The invention provides a cutting knife and a heating coil, and on the basis of cutting with the cutting knife, the heating coil can heat the cutting knife by electromagnetic induction and Joule effect, so that the cutting knife is hot-cut, so that the film can be softened during hot cutting, and the cutting force required for cutting and separation can be reduced. At the same time, when the cutting force becomes smaller, the tensile stress on the film during separation can also be reduced, so as to ensure the flatness of the incision.

Description

Technical Field

[0001] The present invention relates to the field of cutting technology, in particular to a BOPP film edge shaping device. Background Art

[0002] BOPP film, or biaxially oriented polypropylene film, is a polymer film widely used in packaging, printing, labeling and other fields. BOPP film is made by co-extruding polypropylene particles into sheets and then stretching them in both the longitudinal and transverse directions.

[0003] After production is completed, due to stretching during production, the side lines on both sides may not be parallel, forming bends, which causes inconvenience in sales and storage, and thus requires cutting.

[0004] In order to solve the cutting problem, after searching, the Chinese patent publication number CN211388965U discloses a trimming device for BOPP film production, including a work table, one side of the work table is provided with a placing device fixedly connected to the ground, and the other side of the work table is provided with a winding device, the upper side of the work table is fixedly connected to a shaping device, one side of the work table is provided with a groove, the upper side of the groove is fixedly connected to a cutting device, and one side of the cutting device is provided with a rotating device fixedly connected to the work table.

[0005] The above patent has the following deficiencies: it utilizes a cutting knife to perform cold cutting using static pressure, but since BOPP film has good flexibility, on the one hand, a relatively large static pressure is required when using cold cutting, and on the other hand, cold cutting is purely achieved by utilizing shear stress, which causes the film cut to be subjected to a relatively large tensile stress during cutting, resulting in an uneven cut.

[0006] To this end, the present invention proposes a BOPP film edge shaping device. Summary of the Invention

[0007] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a BOPP film edge shaping device.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A BOPP film edge shaping device, comprising a frame,

[0010] The inner wall of the frame is respectively connected to an upper cutting roller through an upper cutting shaft and a lower cutting roller that cooperates with the upper cutting roller through a lower cutting shaft. A cutting knife is fixed to the outer wall of the end of the upper cutting roller, and a knife groove that cooperates with the cutting knife is opened on the inner wall of the lower cutting roller.

[0011] The inner side wall of the frame is rotatably connected to the winding roller 2 via the winding shaft 2, and the inner wall of the frame below the lower cutting roller is rotatably connected to two winding rollers 1 via the winding shaft 1, the upper cutting shaft and the lower cutting shaft are matched through a gear set, and the lower cutting shaft, the winding shaft 1 and the winding shaft 2 are matched through a synchronous belt drive;

[0012] A heating coil is provided on one side of the cutting knife, and the heating coil is fixed to the inner side wall of the frame through a fixing frame.

[0013] Preferably: a DC generator rotor is fixed to the outer wall of the upper cutting shaft, a DC generator stator is matched on the outer side of the DC generator rotor, the DC generator stator is fixed to the outer side wall of the frame, and the output terminal of the DC generator stator is electrically connected to the input terminal of the heating coil through a frequency conversion mechanism.

[0014] Furthermore, a motor is fixed to the side wall of the frame by bolts, and the output shaft of the motor is connected to the outer wall of the upper cutting shaft by a coupling.

[0015] Based on the above scheme: the frequency conversion mechanism includes a resistor half ring 1A, a resistor half ring 1B, a resistor half ring 2A, a resistor half ring 2B and a rotating ring fixed to the outer wall of the frame in sequence, and the resistor half ring 1A, the resistor half ring 1B, the resistor half ring 2A and the resistor half ring 2B are insulated from each other.

[0016] Among the above schemes, a better scheme is: the outer wall of the rotating ring is fixed with an L-shaped electrode head 1 that contacts and electrically conducts with the resistance half ring 1A and the resistance half ring 1B, and the outer wall of the rotating ring is fixed with an L-shaped electrode head 2 that contacts and electrically conducts with the resistance half ring 2A and the resistance half ring 2A.

[0017] As a further solution of the present invention: one end of the resistor half ring 1 A, the resistor half ring 1 B, the resistor half ring 2 A and the resistor half ring 2 B is provided with a wiring terminal.

[0018] At the same time, the side walls of the frame are respectively fixed with a transition conductive ring 1 that contacts and electrically conducts with the L-shaped electrode head 1, and a transition conductive ring 2 that contacts and electrically conducts with the L-shaped electrode head 2. The transition conductive ring 1 and the transition conductive ring 2 are respectively connected to the two terminals of the heating coil, and the wiring terminals of the resistance half ring 1A and the resistance half ring 2A are electrically connected to the positive pole or negative pole of the DC generator rotor, and the wiring terminals of the resistance half ring 1B and the resistance half ring 2B are electrically connected to the negative pole or positive pole of the DC generator rotor.

[0019] As a preferred embodiment of the present invention: the rotating ring is coupled to the lower cutting shaft through a speed increasing assembly, the speed increasing assembly includes a ring gear and a plurality of planetary gears, the ring gear is fixed to the side wall of the fixed plate by bolts, the outer sides of the plurality of planetary gears are engaged with the inner wall of the ring gear, the inner sides of the plurality of planetary gears are engaged with the outer wall of the rotating ring, and the side walls of the plurality of planetary gears are rotatably connected to the same planetary carrier, which is fixed to the end of the lower cutting shaft.

[0020] At the same time, a guide mechanism is also provided on the inner side of the frame. The guide mechanism is composed of two guide rollers that cooperate with each other. The outer sides of the guide rollers are rotatably connected to the same slider through a guide shaft.

[0021] As a more optimal solution of the present invention: the slider is slidably connected to the inner wall of the frame, and the top of the slider is buckled with a pressure sensor, the other end of the pressure sensor is buckled with a spring, and the outer shell of the spring is fixed to the inner wall of the frame.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention provides a cutting knife and a heating coil. On the basis of cutting with the cutting knife, the heating coil can utilize electromagnetic induction and the Joule effect to heat the cutting knife, so that the cutting knife performs thermal cutting, thereby softening the film during thermal cutting and reducing the cutting force required for separation. At the same time, when the cutting force becomes smaller, the tensile stress on the film during separation will also be reduced, thereby ensuring the flatness of the incision.

[0024] 2. The present invention, through the provision of winding roller 1 and winding roller 2, can respectively wind up waste materials and finished products, thereby preventing the working environment pollution caused by waste materials. At the same time, the upper cutting roller, the lower cutting roller, the winding roller 1 and the winding roller 2 are linked with the synchronous belt through a gear set, which can reduce the power source layout on the one hand, and ensure the synchronization of the winding and conveying speeds of various components on the other hand, thereby ensuring reliability.

[0025] 3. The present invention, through the provision of components such as resistance half ring 1A, resistance half ring 1B, resistance half ring 2A, resistance half ring 2B, L-shaped electrode head 1, and L-shaped electrode head 2, can perform AC frequency conversion processing on the voltage output by the stator of the DC generator, and the rotating ring cooperates with the lower cutting shaft transmission, so that the faster the speed of the lower cutting shaft, the higher the frequency of the frequency conversion, and the higher the heating efficiency of the heating coil, and the entire process can achieve adaptive automatic adjustment.

[0026] 4. The present invention, through the setting of the speed-increasing component, can proportionally amplify the rotation speed of the lower cutting shaft and apply it to the rotating ring on the basis of the transmission coordination between the lower cutting shaft and the rotating ring, thereby increasing the frequency conversion frequency of the entire frequency conversion mechanism and further improving the heating efficiency.

[0027] 5. The present invention provides a transition conductive ring 1 and a transition conductive ring 2, which act as a transition to electrically connect the L-shaped electrode head 1 and the L-shaped electrode head 2 to the two ends of the heating coil respectively, thereby preventing the risk of wire harness entanglement and breakage caused by high-speed rotation of the L-shaped electrode head 1 and the L-shaped electrode head 2 when connected by a wire harness, thereby increasing safety and reliability.

[0028] 6. The present invention, through the setting of the guide mechanism, can guide the film on the one hand, thereby increasing the reliability of subsequent cutting; on the other hand, it can also combine the setting of the spring and the upper computer to ensure that the cutting speed matches the discharge speed of the stretching device. At the same time, it can also provide a certain buffering function when the speeds do not match, ensuring that the film is tensioned while preventing the film from being stretched and deformed due to the fast cutting speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of a BOPP film edge shaping device proposed by the present invention;

[0030] Figure 2 This is a schematic diagram of the heating coil structure of a BOPP film edge shaping device proposed by the present invention;

[0031] Figure 3 This is a schematic diagram of the installation position structure of the DC generator rotor, DC generator stator, and frequency conversion mechanism of a BOPP film edge shaping device proposed by the present invention;

[0032] Figure 4 This is a schematic structural diagram of a frequency conversion mechanism of a BOPP film edge shaping device proposed by the present invention;

[0033] Figure 5 This is a schematic structural diagram of a BOPP film edge shaping device proposed by the present invention, comprising a resistor half ring 1A, a resistor half ring 1B, a resistor half ring 2A, a resistor half ring 2B, an L-shaped electrode head 1, and an L-shaped electrode head 2;

[0034] Figure 6 This is a schematic structural diagram of a speed-increasing component of a BOPP film edge shaping device proposed by the present invention;

[0035] Figure 7 This is a schematic structural diagram of a guide mechanism of a BOPP film edge shaping device proposed by the present invention;

[0036] Figure 8 A BOPP film edge shaping device proposed by the present invention Figure 7 A schematic diagram of the enlarged structure of part A;

[0037] Figure 9 This is a schematic diagram of the circuit structure of a BOPP film edge shaping device proposed in the present invention.

[0038] Figure: 1. Frame; 2. Blade slot; 3. Cutting knife; 4. Upper cutting roller; 5. Guide mechanism; 6. Upper cutting shaft; 7. Gear set; 8. Lower cutting shaft; 9. Winding shaft 1; 10. Winding shaft 2; 11. Winding roller 1; 12. Winding roller 2; 13. Lower cutting roller; 14. Heating coil; 15. Fixing frame; 16. Fixing plate; 17. DC generator rotor; 18. DC generator stator; 19. Frequency conversion mechanism; 20. Motor ; 21. Resistor half ring 1A; 22. Resistor half ring 1B; 23. Speed ​​increasing assembly; 24. Resistor half ring 2A; 25. Resistor half ring 2B; 26. L-shaped electrode head 1; 27. L-shaped electrode head 2; 28. Rotating ring; 29. ​​Transition conductive ring 1; 30. Transition conductive ring 2; 31. Gear ring; 32. Planet carrier; 33. Planet gear; 34. Guide roller; 35. Slider; 36. Guide shaft; 37. Spring; 38. Pressure sensor. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be further described in detail below in conjunction with specific implementation methods.

[0040] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention. Example

[0041] A BOPP film edge shaping device, such as Figures 1-9 As shown, it includes a frame 1, the inner wall of the frame 1 is rotatably connected to an upper cutting roller 4 through an upper cutting shaft 6, and is rotatably connected to a lower cutting roller 13 that cooperates with the upper cutting roller 4 through a lower cutting shaft 8. A cutting knife 3 is fixed to the outer wall of the end of the upper cutting roller 4, and a knife groove 2 that cooperates with the cutting knife 3 is opened on the inner wall of the lower cutting roller 13.

[0042] The inner side wall of the frame 1 is rotatably connected to the winding roller 2 12 through the winding shaft 2 10, and the inner wall of the frame 1 located below the lower cutting roller 13 is rotatably connected to the two winding rollers 11 through the winding shaft 1 9. The upper cutting shaft 6 and the lower cutting shaft 8 are driven by the gear set 7, and the lower cutting shaft 8, the winding shaft 1 9 and the winding shaft 2 10 are driven by a synchronous belt.

[0043] A heating coil 14 is provided on one side of the cutting blade 3 , and the heating coil 14 is fixed to the inner wall of the frame 1 through a fixing frame 15 .

[0044] When the device is in use, the film is placed between the upper cutting roller 4 and the lower cutting roller 13 for extrusion and transportation, and then a variable frequency current is passed into the heating coil 14. As a result, due to the electromagnetic induction phenomenon, eddy currents are generated in the cutting blade 3, and the Joule effect is used to heat the cutting blade 3. At the same time, as the upper cutting roller 4 and the lower cutting roller 13 rotate, the cutting blade 3 cooperates with the knife groove 2 to cut and shape the edge of the film. The waste material after cutting is wound around the outer wall of the winding roller 11, and the winding roller 11 winds up the waste material. The finished product after cutting is wound around the outer wall of the winding roller 2 12, and the winding roller 2 12 winds up the finished product.

[0045] This device is provided with a cutting knife 3 and a heating coil 14. On the basis of cutting with the cutting knife 3, the heating coil 14 can utilize electromagnetic induction and Joule effect to heat the cutting knife 3, so that the cutting knife 3 is thermally cut, thereby softening the film during thermal cutting and reducing the cutting force required for cutting and separating. At the same time, when the cutting force becomes smaller, the tensile stress on the film during separation will also be reduced, thereby ensuring the flatness of the incision.

[0046] In addition, the device is provided with a winding roller 11 and a winding roller 2 12, which can respectively wind up the waste and the finished product, thereby preventing the working environment pollution caused by the waste. At the same time, the upper cutting roller 4, the lower cutting roller 13, the winding roller 11 and the winding roller 2 12 are linked with the synchronous belt through the gear set 7. On the one hand, it can reduce the power source layout, and on the other hand, it can ensure the synchronization of the winding and conveying speed of each component to ensure reliability.

[0047] In order to solve the problem of adaptive control of thermal power; Figure 3 As shown, a DC generator rotor 17 is fixed to the outer wall of the upper cutting shaft 6, and a DC generator stator 18 is matched with the outer side of the DC generator rotor 17. The DC generator stator 18 is fixed to the outer wall of the frame 1, and the output terminal of the DC generator stator 18 is electrically connected to the input terminal of the heating coil 14 through the frequency conversion mechanism 19.

[0048] The side wall of the frame 1 is fixed with a motor 20 by bolts, and the output shaft of the motor 20 is connected to the outer wall of the upper cutting shaft 6 through a coupling; when the motor 20 is started, it can drive the upper cutting shaft 6 to rotate.

[0049] When the upper cutting shaft 6 rotates, it can drive the DC generator rotor 17 to rotate, thereby using electromagnetic induction to generate induced DC power in the DC generator stator 18, which is then converted by the frequency conversion mechanism 19 and applied to the heating coil 14.

[0050] As the conveying and cutting speed is faster, the contact time between the cutting blade 3 and the film is shorter. At this time, if the temperature of the cutting blade 3 remains unchanged, the film will be heated for a short time and the softening effect will not be achieved. When the contact time between the cutting blade 3 and the film is long, the film will be heated for a long time and there will be a risk of overheating and melting. Based on this, the device is provided with a DC generator rotor 17, a DC generator stator 18 and a frequency conversion mechanism 19, and uses the DC generator stator 18 to power the heating coil 14. Therefore, when the cutting speed is faster and the rotation speed of the upper cutting shaft 6 is faster, the voltage in the DC generator stator 18 is higher, thereby increasing the power of the heating coil 14 and the temperature of the cutting blade 3 is higher, and vice versa, it is lower, thereby achieving the function of adaptive automatic control of the temperature of the cutting blade 3 and the conveying speed.

[0051] In order to solve the frequency conversion problem; Figure 4 As shown, the frequency conversion mechanism 19 includes a resistor half ring A21, a resistor half ring B22, a resistor half ring A24, a resistor half ring B25 and a rotating ring 28 fixed to the outer wall of the frame 1 in sequence. The resistor half ring A21, the resistor half ring B22, the resistor half ring A24 and the resistor half ring B25 are insulated from each other. The outer wall of the rotating ring 28 is fixed with an L-shaped electrode head 26 that contacts and electrically conducts with the resistor half ring A21 and the resistor half ring B22. The outer wall of the rotating ring 28 is fixed with an L-shaped electrode head 27 that contacts and electrically conducts with the resistor half ring A24 and the resistor half ring A24. One end of the resistor half ring A21, the resistor half ring B22, the resistor half ring A24 and the resistor half ring B25 is provided with a terminal.

[0052] The side walls of the frame 1 are respectively fixed with a transition conductive ring 1 29 that contacts and electrically conducts with the L-shaped electrode head 1 26, and a transition conductive ring 2 30 that contacts and electrically conducts with the L-shaped electrode head 2 27. The transition conductive ring 1 29 and the transition conductive ring 2 30 are respectively connected to the two terminals of the heating coil 14, the wiring terminals of the resistance half ring 1 A21 and the resistance half ring 2 A24 are electrically connected to the positive or negative pole of the DC generator rotor 17, and the wiring terminals of the resistance half ring 1 B22 and the resistance half ring 2 B25 are electrically connected to the negative or positive pole of the DC generator rotor 17.

[0053] The rotating ring 28 is coupled to the lower cutting shaft 8 through the speed increasing assembly 23. The speed increasing assembly 23 includes a ring gear 31 and a plurality of planetary gears 33. The ring gear 31 is fixed to the side wall of the fixed plate 16 by bolts. The outer sides of the plurality of planetary gears 33 are engaged with the inner wall of the ring gear 31. The inner sides of the plurality of planetary gears 33 are engaged with the outer wall of the rotating ring 28. The side walls of the plurality of planetary gears 33 are rotatably connected to the same planetary carrier 32. The planetary carrier 32 is fixed to the end of the lower cutting shaft 8.

[0054] When the lower cutting shaft 8 rotates, it can drive the planetary gear 33 to rotate, thereby driving the rotating ring 28 to rotate. When the rotating ring 28 rotates, it can drive the L-shaped electrode head 1 26 and the L-shaped electrode head 2 27 to rotate. When the L-shaped electrode head 1 26 and the L-shaped electrode head 2 27 are located at the top, the resistor half ring 1 A21 and the resistor half ring 2 B25 are connected to the circuit of the heating coil 14. When the L-shaped electrode head 1 26 and the L-shaped electrode head 2 27 are located at the bottom, the resistor half ring 1 B22 and the resistor half ring 2 A24 are connected to the circuit of the heating coil 14. In the two states, the connection mode of the positive and negative poles of the heating coil 14 and the positive and negative poles of the DC generator rotor 17 is switched. The specific process is as follows:

[0055] ①: When the L-shaped electrode head 1 26 and the L-shaped electrode head 2 27 are located at the top, the L-shaped electrode head 1 26 contacts the resistor half ring 1 A21, and the L-shaped electrode head 2 27 contacts the resistor half ring 2 B25. The resistor half ring 1 A21 is connected to the positive or negative pole of the DC generator rotor 17, and the resistor half ring 2 B25 is connected to the negative or positive pole of the DC generator rotor 17. At this time, the direction of the current received by the heating coil 14 is determined to be positive. In this process, since the ends of the resistor half ring 1 A21 and the resistor half ring 2 B25 are connected to the DC generator rotor 17, as the L-shaped electrode head 1 26 and the L-shaped electrode head 2 27 rotate, the resistance value of the contact circuit between the resistor half ring 1 A21 and the resistor half ring 2 B25 will change, thereby causing the voltage of the heating coil 14 to change.

[0056] ②: When the L-shaped electrode head 1 26 and the L-shaped electrode head 2 27 are located at the bottom, the L-shaped electrode head 1 26 contacts the resistor half ring 1 B22, and the L-shaped electrode head 2 27 contacts the resistor half ring 2 A24. The resistor half ring 1 B22 is connected to the negative pole or the positive pole of the DC generator rotor 17, and the resistor half ring 2 A24 is connected to the positive pole or the negative pole of the DC generator rotor 17. At this time, the direction of the current received by the heating coil 14 is reversed; and in this process, since the ends of the resistor half ring 1 B22 and the resistor half ring 2 A24 are connected to the DC generator rotor 17, as the L-shaped electrode head 1 26 and the L-shaped electrode head 2 27 rotate, the resistance value of the contact circuit between the resistor half ring 1 B22 and the resistor half ring 2 A24 will change, thereby causing the voltage of the heating coil 14 to change;

[0057] Thus, the AC frequency conversion effect of changing the positive and negative voltage and the magnitude of the voltage applied to the heating coil 14 is achieved; and when the heating efficiency of the heating coil 14 is proportional to the frequency, the greater the frequency, the higher the heating efficiency.

[0058] This device, by setting components such as resistance half ring A21, resistance half ring B22, resistance half ring A24, resistance half ring B25, L-shaped electrode head 26, and L-shaped electrode head 27, can perform AC frequency conversion processing on the voltage output by the DC generator stator 18, and the rotating ring 28 cooperates with the lower cutting shaft 8 in transmission, so that the faster the speed of the lower cutting shaft 8, the higher the frequency of the frequency conversion, and the higher the heating efficiency of the heating coil 14, and the entire process can achieve adaptive automatic adjustment.

[0059] In addition, the device is provided with a speed increasing component 23, which proportionally amplifies the rotation speed of the lower cutting shaft 8 and applies it to the rotating ring 28 on the basis of transmission coordination between the lower cutting shaft 8 and the rotating ring 28, thereby increasing the frequency conversion frequency of the entire frequency conversion mechanism 19 and further improving the heating efficiency.

[0060] At the same time, the device sets a transition conductive ring 29 and a transition conductive ring 30, which act as a transition to electrically connect the L-shaped electrode head 26 and the L-shaped electrode head 27 to the two ends of the heating coil 14 respectively, thereby preventing the risk of wire harness entanglement and breakage caused by high-speed rotation of the L-shaped electrode head 26 and the L-shaped electrode head 27 when using a wire harness connection, thereby increasing safety and reliability.

[0061] When this embodiment is in use, the film is placed between the upper cutting roller 4 and the lower cutting roller 13 for extrusion and transportation, and then a variable frequency current is passed through the heating coil 14, so that due to the electromagnetic induction phenomenon, eddy currents are generated in the cutting blade 3, and then the Joule effect is used to achieve heating of the cutting blade 3. At the same time, when the motor 20 is started, it can drive the upper cutting shaft 6 to rotate, thereby driving the lower cutting shaft 8, winding shaft 1 9, and winding shaft 2 10 to rotate through the gear set 7 and the synchronous belt, so that the lower cutting roller 13, winding roller 1 11 and winding roller 2 12 rotate synchronously. As the upper cutting roller 4 and the lower cutting roller 13 rotate, the cutting blade 3 cooperates with the knife groove 2 to cut and shape the edge of the film, and the cut waste is wound around the winding roller. The outer wall of the winding roller 11, the winding roller 11 winds up the waste material, and the cut finished product is wound on the outer wall of the winding roller 2 12, and the winding roller 2 12 winds up the finished product, and when the upper cutting shaft 6 rotates, it can drive the DC generator rotor 17 to rotate, thereby using electromagnetic induction to generate induced DC power in the DC generator stator 18, which is then applied to the heating coil 14 after frequency conversion by the frequency conversion mechanism 19, and when the L-shaped electrode head 1 26 and the L-shaped electrode head 2 27 are located above, the L-shaped electrode head 1 26 contacts the resistor half ring 1 A21, and the L-shaped electrode head 2 27 contacts the resistor half ring 2 B25, and the resistor half ring 1 A21 is connected to the positive or negative pole of the DC generator rotor 17, and the resistor half ring 2 B2 5 is connected to the negative or positive pole of the DC generator rotor 17. At this time, the direction of the current received by the heating coil 14 is determined to be positive. In this process, since the ends of the resistor half ring A21 and the resistor half ring B25 are connected to the DC generator rotor 17, as the L-shaped electrode head 1 26 and the L-shaped electrode head 2 27 rotate, the resistance value of the contact circuit between the resistor half ring A21 and the resistor half ring B25 will change, thereby changing the voltage of the heating coil 14. When the L-shaped electrode head 1 26 and the L-shaped electrode head 2 27 are located at the bottom, the L-shaped electrode head 1 26 contacts the resistor half ring 1 B22, the L-shaped electrode head 2 27 contacts the resistor half ring 2 A24, and the resistor half ring 1 B22 is connected to the DC generator. The negative pole or positive pole of the rotor 17, the resistor half ring two A24 is connected to the positive pole or negative pole of the DC generator rotor 17, and the direction of the current received by the heating coil 14 is reversed; and in this process, since the ends of the resistor half ring one B22 and the resistor half ring two A24 are connected to the DC generator rotor 17, as the L-shaped electrode head one 26 and the L-shaped electrode head two 27 rotate, the resistance value of the contact circuit between the resistor half ring one B22 and the resistor half ring two A24 will change, thereby changing the voltage of the heating coil 14; thereby achieving the AC frequency conversion effect of the positive and negative changes and the changes in the size of the voltage received by the heating coil 14; and when the heating efficiency of the heating coil 14 is proportional to the frequency, the higher the frequency, the higher the heating efficiency. Example

[0062] A BOPP film edge shaping device, such as Figure 1 、 7 8, in order to solve the guiding problem; this embodiment makes the following improvements on the basis of embodiment 1: a guide mechanism 5 is also provided on the inner side of the frame 1, and the guide mechanism 5 is composed of two guide rollers 34 that cooperate with each other, and the outer side of the guide roller 34 is rotatably connected to the same slider 35 through a guide shaft 36.

[0063] The slider 35 is slidably connected to the inner wall of the frame 1 , and a pressure sensor 38 is buckled on the top of the slider 35 , and a spring 37 is buckled on the other end of the pressure sensor 38 , and the outer shell of the spring 37 is fixed to the inner wall of the frame 1 .

[0064] In this embodiment, this device can be arranged synchronously with the stretching device to form an assembly line structure, and the film stretched by the stretching device is directly guided into this device. In the process of synchronous cooperation, the film passes between the two guide rollers 34. When the cutting speed is greater than the discharge speed of the stretching device, the guide roller 34 will move upward under the influence of the tension of the film, thereby causing the slider 35 to move upward, causing the pressure sensor 38 to be compressed and the pressure reading of the spring 37 to increase. At this time, the speed of the motor 20 can be reduced by cooperating with the upper computer, otherwise it will increase.

[0065] This device, by setting up a guide mechanism 5, can guide the film on the one hand, thereby increasing the reliability of subsequent cutting; on the other hand, it can also combine with the spring 37 and the host computer setting to ensure that the cutting speed matches the discharge speed of the stretching device. At the same time, it can also provide a certain buffering function when the speeds do not match, ensuring that the film is tensioned while preventing the film from being stretched and deformed due to the fast cutting speed.

[0066] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A BOPP film edge shaping device, comprising a frame (1), It is characterized in that The inner wall of the frame (1) is rotatably connected to an upper cutting roller (4) via an upper cutting shaft (6), and is rotatably connected to a lower cutting roller (13) that cooperates with the upper cutting roller (4) via a lower cutting shaft (8); a cutting knife (3) is fixed to the outer wall of the end of the upper cutting roller (4), and a knife groove (2) that cooperates with the cutting knife (3) is formed on the inner wall of the lower cutting roller (13); The inner side wall of the frame (1) is rotatably connected to the second winding roller (12) via the second winding shaft (10), and the inner wall of the frame (1) located below the lower cutting roller (13) is rotatably connected to two first winding rollers (11) via the first winding shaft (9), the upper cutting shaft (6) and the lower cutting shaft (8) are driven by a gear set (7), and the lower cutting shaft (8), the first winding shaft (9) and the second winding shaft (10) are driven by a synchronous belt; A heating coil (14) is provided on one side of the cutting knife (3), and the heating coil (14) is fixed to the inner wall of the frame (1) via a fixing frame (15); A DC generator rotor (17) is fixed to the outer wall of the upper cutting shaft (6); a DC generator stator (18) is matched to the outer side of the DC generator rotor (17); the DC generator stator (18) is fixed to the outer side wall of the frame (1), and the output terminal of the DC generator stator (18) is electrically connected to the input terminal of the heating coil (14) through a frequency conversion mechanism (19); The frequency conversion mechanism (19) comprises a resistor half ring 1A (21), a resistor half ring 1B (22), a resistor half ring 2A (24), a resistor half ring 2B (25) and a rotating ring (28) which are fixed to the outer wall of the frame (1) in sequence, and the resistor half ring 1A (21), the resistor half ring 1B (22), the resistor half ring 2A (24) and the resistor half ring 2B (25) are insulated from each other; The outer wall of the rotating ring (28) is fixed with an L-shaped electrode head 1 (26) which contacts and electrically conducts with the resistor half ring 1 A (21) and the resistor half ring 1 B (22); the outer wall of the rotating ring (28) is fixed with an L-shaped electrode head 2 (27) which contacts and electrically conducts with the resistor half ring 2 A (24) and the resistor half ring 2 A (24); One end of each of the resistor half ring 1A (21), the resistor half ring 1B (22), the resistor half ring 2A (24) and the resistor half ring 2B (25) is provided with a wiring terminal; A transition conductive ring 1 (29) and a transition conductive ring 2 (30) are fixed to the side walls of the frame (1), respectively. The transition conductive ring 1 (29) and the transition conductive ring 2 (30) are in contact with the L-shaped electrode head 1 (26) and are in electrical conduction with each other. The transition conductive ring 1 (29) and the transition conductive ring 2 (30) are respectively connected to two terminals of the heating coil (14). The connection terminals of the resistance half ring 1 A (21) and the resistance half ring 2 A (24) are electrically connected to the positive or negative pole of the DC generator rotor (17). The connection terminals of the resistance half ring 1 B (22) and the resistance half ring 2 B (25) are electrically connected to the negative or positive pole of the DC generator rotor (17). The rotating ring (28) is coupled to the lower cutting shaft (8) through a speed increasing assembly (23). The speed increasing assembly (23) comprises a gear ring (31) and a plurality of planetary gears (33). The gear ring (31) is fixed to the side wall of the fixing plate (16) by bolts. The outer sides of the plurality of planetary gears (33) are meshed with the inner wall of the gear ring (31). The inner sides of the plurality of planetary gears (33) are meshed with the outer wall of the rotating ring (28). The side walls of the plurality of planetary gears (33) are rotatably connected to the same planetary carrier (32). The planetary carrier (32) is fixed to the end of the lower cutting shaft (8).

2. A BOPP film edge shaping device according to claim 1, It is characterized in that The side wall of the frame (1) is fixed with a motor (20) by means of bolts, and the output shaft of the motor (20) is connected to the outer wall of the upper cutting shaft (6) by means of a coupling.

3. A BOPP film edge shaping device according to claim 1, It is characterized in that A guide mechanism (5) is also provided on the inner side of the frame (1), and the guide mechanism (5) is composed of two guide rollers (34) that cooperate with each other. The outer side of the guide roller (34) is rotatably connected to a same slider (35) via a guide shaft (36).

4. A BOPP film edge shaping device according to claim 3, It is characterized in that The slider (35) is slidably connected to the inner wall of the frame (1), and a pressure sensor (38) is buckled on the top of the slider (35), and a spring (37) is buckled on the other end of the pressure sensor (38), and the outer shell of the spring (37) is fixed to the inner wall of the frame (1).

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