A cast film slitting apparatus

Abstract

The utility model discloses a kind of cast film slitting device, belong to cast film production technical field.It includes fixed frame and slitting mechanism, slitting mechanism slidingly connects and is installed on fixed frame, and it is equipped with the reciprocating mechanism of driving slitting mechanism reciprocating motion and rewinding mechanism of collecting cast film after slitting on fixed frame.This device is controlled cutting knife to be in cutting position and non-cutting position by double-headed electromagnet, realize the combination of several commonly used cast film slitting specification width, avoid adjusting the distance between tool, improve production efficiency, guarantee the consistency of tool spacing, reciprocating mechanism drives slitting mechanism reciprocating motion simultaneously, change the tension of cast film, make cast film do microscopic cutting motion on tool, improve the quality of cast film cutting of tool, tool movement makes debris fall off, prevent the retention of cutting chip on tool, can adapt faster cutting speed, improve slitting efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of cast film production technology, specifically a cast film slitting device. Background Technology

[0002] Cast film, a type of plastic film prepared through a casting process, is mainly made by heating and melting plastic raw materials in an extruder, then extruding them through a T-die. The melt is then uniformly cast onto a cooling roller under the action of gravity and airflow, and after cooling and shaping, it forms a film. Due to its excellent transparency, flatness, and uniformity, it is widely used in many fields such as packaging, electronics, medical, and hygiene products.

[0003] Existing cast film slitting equipment cuts the produced cast film or the cast film printed by printing equipment into widths according to the specifications required by the market. Different widths of cast film are cut by adjusting the distance between the blades.

[0004] Typically, cast films that need to be slit are mainly of two or three specifications. When slit cast films of different widths, it is necessary to adjust the distance between the slitting blades. Adjusting the blade distance is time-consuming and laborious. Each adjustment of the blade spacing will have a large error, affecting the accuracy of the required product width. In addition, due to the insufficient surface tension of the cast film when the blade is cutting, the cross-section of the cast film is not smooth. Utility Model Content

[0005] To address the problems of time-consuming and labor-intensive blade distance adjustment, frequent adjustments affecting slitting accuracy, and uneven cut surfaces in existing cast film slitting devices, this invention provides a cast film slitting device.

[0006] This utility model is achieved through the following technical solution:

[0007] A cast film slitting device includes a fixed frame and a slitting mechanism. The slitting mechanism is slidably connected to the fixed frame. The fixed frame is provided with a reciprocating mechanism for driving the slitting mechanism to reciprocate and a rewinding mechanism for collecting the slitted cast film.

[0008] The slitting mechanism includes a guide rail connected to and mounted on the side wall of the fixed frame, a bracket slidably mounted on the guide rail, a movable roller rotatably mounted on the bracket, and a first slide rod and a second slide rod fixedly mounted thereon. Several cutters are rotatably mounted on the second slide rod, and a double-headed electromagnet for driving the cutters to swing is connected and mounted on the first slide rod.

[0009] A further improvement of this utility model is that the reciprocating mechanism includes a guide frame fixed to the inner wall of the fixed frame, a guide rod slidably connected to the guide frame, a connecting frame connected to one end of the guide rod, connecting rods rotatably connected to both sides of the connecting frame, a sliding sleeve rotatably connected to the other end of the two connecting rods, an eccentric wheel rotatably connected to the sliding sleeve, a rotating shaft connected to the eccentric wheel, the rotating shaft rotatably connected to the side wall of the fixed frame, a motor connected to the bottom of the side wall of the fixed frame, and the output end of the motor connected to the rotating shaft via a belt drive.

[0010] A further improvement of this utility model is that the rewinding mechanism includes two support rods and a pneumatic telescopic rod rotatably connected to the side wall of the fixed frame. The output end of the pneumatic telescopic rod is rotatably connected to the support rods. A servo motor is connected and installed on the side wall of the fixed frame. A first gear is connected and installed on the output end of the servo motor. A second gear that meshes with the first gear is connected and installed on the side wall of the fixed frame. A collecting roller is rotatably connected and installed on the upper side of the support rods. A third gear that meshes with the second gear is provided on one side of the collecting roller.

[0011] A further improvement of this utility model is that a synchronizing rod is installed between the two support rods.

[0012] A further improvement of this utility model is that two guide rollers are rotatably connected and installed on the fixed frame on the side away from the rewinding mechanism.

[0013] A further improvement of this invention is that the two guide rollers are connected by a servo motor.

[0014] As can be seen from the above technical solutions, the beneficial effects of this utility model are:

[0015] In use, adjust the distance between the cutters on the second slide bar to accommodate various combinations of commonly used cast film cutting widths. Adjust the position of the double-headed electromagnet so that it corresponds to the adsorption position of the cutter. The controller outputs current to different positions of the double-headed electromagnet, causing the cutter corresponding to the required specification to rotate to the cutting position and maintain the adsorption state. The produced cast film or the cast film after printing is laid on the movable roller and cut by the cutter before being wound onto the rewinding mechanism. As the rewinding mechanism rotates, the cutter continuously cuts the cast film. At the same time, the reciprocating mechanism drives the slitting mechanism to swing back and forth in the horizontal direction, causing the tension of the cast film at the slitting mechanism to change periodically. This causes the cast film to swing up and down slightly on the cutter, allowing the cutter to cut the cast film more effectively. This device uses a dual-headed electromagnet to control the cutter to be in the cutting and non-cutting positions, enabling combinations of several commonly used cast film slitting widths. This avoids adjusting the distance between the cutters, improves production efficiency, and ensures the consistency of the cutter spacing. At the same time, the reciprocating mechanism drives the slitting mechanism to reciprocate, changing the tension of the cast film and causing it to undergo micro-cutting motion on the cutter. This improves the quality of the cutter's cutting of the cast film. The cutter movement causes debris to fall off, preventing chip residue on the cutter. It can adapt to faster cutting speeds and improve slitting efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 for Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0019] Figure 3 for Figure 1 A magnified schematic diagram of the structure at point B in the middle.

[0020] Figure 4 This is a cross-sectional structural diagram of the present invention.

[0021] Figure 5 for Figure 4 A magnified schematic diagram of the structure at point C.

[0022] In the attached diagram: 1. Fixed frame; 2. Guide roller; 3. Slitting mechanism; 4. Reciprocating mechanism; 5. Rewinding mechanism; 30. Guide rail; 31. Support; 32. Movable roller; 33. First slide rod; 34. Second slide rod; 35. Cutter; 36. Double-headed electromagnet; 41. Guide frame; 42. Guide rod; 43. Connecting frame; 44. Connecting rod; 45. Sliding sleeve; 46. Eccentric wheel; 47. Rotating shaft; 48. Motor; 49. Belt; 51. Support rod; 52. Pneumatic telescopic rod; 53. Servo motor; 54. First gear; 55. Second gear; 56. Collecting roller; 57. Third gear; 511. Synchronizing rod. Detailed Implementation

[0023] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0024] like Figure 1-5 As shown, a cast film slitting device includes a fixed frame 1 and a slitting mechanism 3. The slitting mechanism 3 is slidably mounted on the fixed frame 1 via a guide rail 30 on the fixed frame 1. The fixed frame 1 is provided with a reciprocating mechanism 4 for driving the slitting mechanism 3 to reciprocate and a rewinding mechanism 5 for collecting the slitting cast film (with the direction of movement of the cast film as the front-back direction).

[0025] The slitting mechanism 3 includes two upper and lower guide rails 30 respectively connected and installed on the two inner side walls of the fixed frame 1. A bracket 31 is slidably fitted between the two guide rails 30. Two movable rollers 32 are rotatably connected to the bracket 31, and a first slide rod 33 and a second slide rod 34 are fixedly installed on it. The two movable rollers 32 are located on both sides of the first slide rod 33 and the second slide rod 34. A plurality of cutters 35 are rotatably connected to the second slide rod 34. The cutters 35 are provided with positioning bolts, which can fix the cutters 35 at corresponding positions in the axial direction of the second slide rod 34. It can still rotate around the second slide bar 34. A double-headed electromagnet 36 that drives the cutter 35 to swing is connected and installed on the first slide bar 33. The first slide bar 33 can be set as a rectangular bar, which can constrain the circumferential rotation of the double-headed electromagnet 36. At the same time, the double-headed electromagnet 36 is also provided with positioning bolts, which can constrain the double-headed electromagnet 36 to the position of the corresponding cutter 35, attract the cutter 35, and make it rotate a certain angle so that the cutter 35 is in or away from the cutting position. The attraction force of the double-headed electromagnet is greater than 30N, which is sufficient to attract the cutter 35 for stable cutting.

[0026] In use, adjust the distance between the cutters 35 on the second slide bar 34 to accommodate various combinations of commonly used cast film cutting widths. Adjust the position of the double-headed electromagnet 36 so that it corresponds to the adsorption position of the cutter 35. The controller outputs control current to different positions of the double-headed electromagnet 36, making one side of the double-headed electromagnet 36 magnetic, adsorbing the cutter 35. Rotate the cutter 35 corresponding to the required width specification to the cutting position and maintain the adsorption state. Lay the produced cast film or the cast film after printing on the movable roller 32. The movable roller 32 provides guidance and positioning support for the cast film. After being cut by the cutter 35, it is wound onto the rewinding mechanism 5. As the rewinding mechanism 5 rotates, the cutter 35 continuously cuts the cast film. At the same time, the reciprocating mechanism 4 drives the slitting mechanism 3 to swing back and forth in the horizontal direction, causing the tension of the cast film at the slitting mechanism 3 to change periodically. This causes the cast film to swing up and down slightly on the cutter, allowing the cutter 35 to cut the cast film more neatly. This device uses a dual-headed electromagnet to control the cutter 35 to be in the cutting or non-cutting position, enabling combinations of widths for several commonly used cast film slitting specifications. This avoids the need to adjust the distance between the cutters when slitting cast films of different specifications, improving production efficiency and ensuring the consistency of the spacing between the cutters 35. At the same time, the reciprocating mechanism 4 drives the slitting mechanism 3 to reciprocate, changing the tension of the cast film and causing the cast film to undergo micro-cutting motion on the cutter. This improves the quality of the cutter's cutting of the cast film. The cutter's movement can cause the debris adhering to the cutter 35 to fall off, preventing chip residue on the cutter. It can adapt to faster cutting speeds and improve slitting efficiency.

[0027] The reciprocating mechanism 4 includes two guide frames 41 fixed on the inner walls of both sides of the fixed frame 1. The axial direction of the guide frame 41 is parallel to the sliding direction of the cutting mechanism 3 on the fixed frame 1. A guide rod 42 is slidably connected and installed in the opening of the guide frame 41. The cross section of the guide rod 42 can be rectangular or circular. A connecting frame 43 is connected and installed at one end of the guide rod 42. Connecting rods 44 are rotatably connected and installed on both sides of the connecting frame 43. A sliding sleeve 45 is rotatably connected and installed at the other end of the two connecting rods 44. An eccentric wheel 46 is rotatably connected and installed in the sliding sleeve 45 through a cylindrical roller bearing. A rotating shaft 47 is connected and installed at the eccentric position on the eccentric wheel 46. The rotating shaft 47 connects the eccentric wheels 46 on both sides and passes through the waist hole on the side wall of the connecting frame 43. The rotating shaft 47 passes through the side wall of the fixed frame 1 and is rotatably connected to it. A motor 48 is connected and installed at the bottom of the inner side wall of the fixed frame 1. The output end of the motor 48 passes through the side wall of the fixed frame 1 and is connected to the rotating shaft 47 through a pulley and a belt 49. This eccentric wheel structure, while enabling reciprocating motion, reduces radial wear on the guide rod 42, improves the load-bearing capacity of the reciprocating mechanism 4, and extends the service life of the reciprocating mechanism 4.

[0028] The reciprocating mechanism 4 can also be a crank-slider mechanism, where the crank is driven to rotate by a motor, and the slider is driven to reciprocate along the guide rail via a connecting rod, thus causing the cutting mechanism 3 to reciprocate. Alternatively, a gear and rack mechanism can be used, where the forward and reverse rotation of the gears drives the rack to move linearly, or a hydraulic or starting drive mechanism can be used, where the reciprocating motion is directly generated by the fluid pressure of a cylinder or oil cylinder. These mechanisms are simple in structure and powerful.

[0029] It should be noted that parts that experience relative sliding require regular inspection, cleaning, and lubrication to reduce wear and extend service life.

[0030] The rewinding mechanism 5 includes two support rods 51 and a pneumatic telescopic rod 52 that are rotatably connected to the bottom of one end of the side wall of the fixed frame 1. The output end of the pneumatic telescopic rod 52 is rotatably connected to the support rods 51. A servo motor 53 is connected and installed on the side wall of the fixed frame 1. A first gear 54 is connected and installed on the output end of the servo motor 53. A second gear 55 that meshes with the first gear 54 is connected and installed on the side wall of the fixed frame 1. A semi-open positioning groove is provided on the support rods 51. A collecting roller 56 is rotatably connected and installed on the upper side of the support rods 51. The rotating bearing on the collecting roller 56 is engaged in the positioning groove for positioning. A third gear 57 that meshes with the second gear 55 is provided on one side of the collecting roller 56. In use, the collecting roller 56 is placed on the support rod 51, and the pneumatic telescopic rod 52 is controlled to retract, raising the collecting roller 56 so that the third gear 57 meshes with the second gear 55. The servo motor 53 is started to rotate, driving the collecting roller 56 to rotate and collect the cut cast film. The collecting roller 56 adopts an air-expansion fixing device, which can fix the roll in a certain position on the collecting roller 56. The automatic raising and lowering of the collecting roller 56 is realized by the extension and retraction of the pneumatic telescopic rod 52, saving manual handling and improving production efficiency.

[0031] A synchronizing rod 511 is installed between the two support rods 51. This enables the support rods 51 to rotate synchronously, reducing the torsional torque on the collecting roller 56 caused by inconsistent output force of the pneumatic telescopic rod 52, which would affect the uniformity of the cast film collected by the collecting roller 56.

[0032] Two guide rollers 2 are rotatably mounted on the fixed frame 1 on the side away from the rewinding mechanism 5. These rollers can correct the position of the cast film, making the forward direction of the cast film inclined with the blade of the cutter 35, which helps to reduce cutting resistance and make the cut smoother.

[0033] The two guide rollers 2 are connected by a servo motor, and a tension detection device (not shown in the attached diagram) is also installed between the guide rollers 2. The surface of the guide rollers 2 has a certain friction. When insufficient or excessive tension is detected, the controller will control the speed of the servo motor to control the tension of the cast film, so that the cast film is within a suitable tension range, which is beneficial for cutting and winding.

[0034] The controller can be a common PLC controller, such as Schneider Electric M258. By setting the program, the cutter 35 corresponding to the selected width can be selected and placed at the cutting position to cut the cast film. As the cast film wound on the collecting roller 56 becomes thicker, the tension of the cast film needs to be continuously detected and the rotation speed of the servo motor controlled to prevent the tension of the cast film from being too high or too low, which would affect the cutting and winding quality of the cast film.

[0035] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cast film slitting device, comprising a fixing frame (1) and a slitting mechanism (3), characterized in that, The sliding mechanism (3) is slidably connected and installed on the fixed frame (1). The fixed frame (1) is provided with a reciprocating mechanism (4) that drives the sliding mechanism (3) to reciprocate and a rewinding mechanism (5) that collects the slid cast film. The slitting mechanism (3) includes a guide rail (30) connected to and installed on the side wall of the fixed frame (1). A bracket (31) is slidably connected to the guide rail (30). A movable roller (32) is rotatably connected to the bracket (31) and a first slide rod (33) and a second slide rod (34) are fixedly installed. Several cutters (35) are rotatably connected to the second slide rod (34). A double-headed electromagnet (36) that drives the cutters (35) to swing is connected to the first slide rod (33).

2. The casting film slitting device according to claim 1, characterized in that, The reciprocating mechanism (4) includes a guide frame (41) fixed on the inner wall of the fixed frame (1). A guide rod (42) is slidably connected to the guide frame (41). A connecting frame (43) is connected to one end of the guide rod (42). A connecting rod (44) is rotatably connected to both sides of the connecting frame (43). A sliding sleeve (45) is rotatably connected to the other end of the two connecting rods (44). An eccentric wheel (46) is rotatably connected inside the sliding sleeve (45). A rotating shaft (47) is connected to the eccentric wheel (46). The rotating shaft (47) is rotatably connected to the side wall of the fixed frame (1). A motor (48) is connected to the bottom of the side wall of the fixed frame (1). The output end of the motor (48) is connected to the rotating shaft (47) via a belt (49).

3. The casting film slitting device according to claim 2, characterized in that, The rewinding mechanism (5) includes two support rods (51) and a pneumatic telescopic rod (52) rotatably connected to the side wall of the fixed frame (1). The output end of the pneumatic telescopic rod (52) is rotatably connected to the support rods (51). A servo motor (53) is connected and installed on the side wall of the fixed frame (1). A first gear (54) is connected and installed on the output end of the servo motor (53). A second gear (55) meshing with the first gear (54) is connected and installed on the side wall of the fixed frame (1). A collecting roller (56) is rotatably connected and installed on the upper side of the support rod (51). A third gear (57) meshing with the second gear (55) is provided on one side of the collecting roller (56).

4. The casting film slitting apparatus according to claim 3, characterized in that, A synchronizing rod (511) is installed between the two support rods (51).

5. The cast film slitting apparatus according to claim 3 or 4, characterized in that, Two guide rollers (2) are rotatably connected to the fixed frame (1) on the side away from the rewinding mechanism (5).

6. The cast film slitting apparatus according to claim 5, characterized in that, The two guide rollers (2) are connected by a servo motor.

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