CN115923112B

CN115923112B - Stretching equipment for BOPP film

Info

Publication number: CN115923112B
Application number: CN202310218676.7A
Authority: CN
Inventors: 刘向; 周健; 韩立彦
Original assignee: Tianjin Huaheng Packaging Materials Co ltd
Current assignee: Tianjin Huaheng Packaging Materials Co ltd
Priority date: 2023-03-09
Filing date: 2023-03-09
Publication date: 2023-05-05
Anticipated expiration: 2043-03-09
Also published as: CN115923112A

Abstract

The invention relates to the technical field of BOPP film stretching, in particular to stretching equipment for BOPP films, which comprises a conveying unit, a stretching unit and a rolling unit, wherein the stretching unit is fixedly arranged on the conveying unit, and the rolling unit is fixedly arranged at the lower end of the stretching unit. According to the invention, the thick sheet processed by the casting machine is flattened and conveyed through the conveying unit, so that the thick sheet smoothly enters the stretching unit, synchronous biaxial stretching treatment is carried out on the thick sheet through the stretching unit, and before stretching, the stretching points of the thick sheet are increased through adding additional contact points, so that the deformation points of the edge of the stretched film are increased, the width of the edge deformation of the film is reduced, the width of the edge of the film to be cut off is reduced, the processing utilization rate of equipment is improved, the film is wound through the winding unit, the wound film can be rapidly separated from the equipment, the time for stopping the operation of the equipment is shortened, and the processing efficiency of the equipment is improved.

Description

Stretching equipment for BOPP film

Technical Field

The invention relates to the technical field of BOPP film stretching, in particular to stretching equipment for a BOPP film.

Background

The BOPP film is a good transparent flexible packaging material, and is manufactured by co-extrusion of polypropylene particles to form a sheet and stretching in longitudinal and transverse directions, and has the advantages of light weight, no toxicity, no odor, moisture resistance, wide application range, stable performance, high efficiency, energy saving and the like, the total thickness is reduced, the main processing mode of the BOPP film is a flat film method, the flat film method is divided into a synchronous biaxial stretching method and a gradual biaxial stretching method, and the BOPP film is processed mainly aiming at the synchronous biaxial stretching method.

The synchronous biaxial stretching method is to stretch the thick sheet processed by a casting machine into stretching equipment in the longitudinal and transverse directions, the edge of the stretched film is deformed and cannot be used, therefore, the stretched film is required to be cut before rolling, and biaxial stretching is required when the film is stretched by synchronous biaxial stretching, but the film edge deformation is large due to less stretching contact points of the film, so that the size of the follow-up cutting waste of the film is large, the waste rate and the production cost of the film are high, the film is required to be taken down after rolling, rolling parts are required to be sleeved again, the equipment is required to stop working for a period of time, and the processing efficiency of the equipment is reduced.

Disclosure of Invention

In order to solve the technical problems, the invention provides stretching equipment for BOPP films.

The stretching equipment for the BOPP film comprises a conveying unit, a stretching unit and a rolling unit, wherein the stretching unit is fixedly arranged on the conveying unit, and the rolling unit is fixedly arranged at the lower end of the stretching unit.

The stretching unit comprises a drying oven, the drying oven is fixedly arranged on the conveying unit, electric push rods are symmetrically and fixedly arranged in the drying oven, a left clamping frame is fixedly arranged at the tail end of each electric push rod, a right clamping frame is fixedly arranged at the right end of each left clamping frame, and a feeding frame is rotationally connected to the lower side of the drying oven.

The winding unit comprises a fixed vertical plate, the lower end of the baking oven is fixedly provided with the fixed vertical plate, the front end of the fixed vertical plate is rotationally connected with a winding roller, the rear end of the fixed vertical plate is fixedly provided with a motor I through a motor seat, an output shaft of the motor I is fixedly connected with the winding roller through a coupler, the front end of the fixed vertical plate is rotationally connected with a bidirectional threaded rod, the front side and the rear side of the bidirectional threaded rod are provided with thread grooves with opposite rotation directions, the front side and the rear side of the bidirectional threaded rod are symmetrically connected with a cutting knife in a threaded connection mode, and the front end of the fixed vertical plate is fixedly provided with a guide rod penetrating through the cutting knife.

The first preferred technical scheme is as follows: the conveying unit comprises a workbench, conveying rollers are symmetrically and rotationally connected to the left side and the right side of the front end of the workbench, gears I are fixedly installed at the rear end of the conveying rollers and meshed with each other, a motor II is fixedly installed at the rear end of the workbench through a motor base, an output shaft of the motor II is fixedly connected with gears I on the left side through a coupler, a threaded column is rotationally connected to the middle of the conveying rollers, a round platform block with a small-diameter end horizontally and backwards is connected to the threaded column in a threaded mode, sliding fit grooves are evenly formed in the outer ends of the conveying rollers, protruding columns are connected in the sliding fit grooves in a sliding fit mode, the protruding columns are connected with inclined faces of the round platform block in a sliding fit mode, positioning supports are fixedly installed at the tail ends of the protruding columns, and extrusion columns are rotationally connected to the positioning supports.

And the second preferred technical scheme is as follows: the oven includes the rectangular plate, rectangular through-hole has been seted up at the rectangular plate middle part, and left clamping frame upper end fixed mounting has the guide block, and rectangular plate inner wall fixed mounting has the net pipeline, and even fixed mounting has the toper gas outlet that runs through the rectangular plate on the net pipeline, and oven right-hand member fixed mounting has the air pump, and air pump right-hand member fixed mounting has the screw-thread intake pipe, and screw-thread intake pipe air inlet fixed mounting has the filter, screw-thread intake pipe outer end fixed mounting has the insulation cover, and fixed mounting has the heating wire in the insulation cover.

And the preferred technical scheme is as follows: the left clamping frame comprises a control plate, the control plate is fixedly installed at the tail end of the electric push rod, the left clamping columns are connected to opposite ends of the control plate in an up-down sliding fit mode, the left clamping column at the middle part is fixedly connected with the control plate, the middle parts of the left clamping columns adjacent to each other are hinged with V-shaped hinging rods, each V-shaped hinging rod consists of two rod bodies connected in a rotating mode through a coaxial center, the middle parts of the V-shaped hinging rods are connected with connecting rods in a rotating mode, the connecting rods are connected with rectangular connecting plates in a sliding fit mode, the electric telescopic rods are fixedly installed at the middle parts of the control plate, the tail ends of the electric telescopic rods are fixedly connected with the rectangular connecting plates, magnetic attraction blocks are fixedly installed at the right ends of the left clamping columns, telescopic support columns I are fixedly connected between the adjacent left clamping columns, and right ends of the telescopic support columns are aligned with the right ends of the magnetic attraction blocks.

The preferable technical scheme is as follows: the right clamping frame comprises a clamping cylinder, the right end of the control panel is fixedly provided with the clamping cylinder, the right end of the clamping cylinder is fixedly provided with an inverted Z-shaped plate, opposite ends of the inverted Z-shaped plate are connected with right clamping columns in a sliding fit mode, the right clamping columns are uniformly distributed, the right clamping columns in the middle are fixedly connected with the inverted Z-shaped plate, the left end of each right clamping column is fixedly provided with an electromagnetic plate, the outer ends of the electromagnetic plates and the magnetic attraction blocks are provided with round corners, and the right clamping columns are fixedly connected with a telescopic support column II in common, and the left ends of the telescopic support column II are aligned with the left ends of the electromagnetic plates.

The preferable technical scheme is as follows: the feeding frame comprises a feeding column I, the lower side in the oven is rotationally connected with a feeding column I, the right side in the oven is rotationally connected with a feeding column II, the rear ends of the feeding column I and the feeding column II are fixedly provided with a gear II, the gears are meshed with each other, the rear end of the gear II on the right side is fixedly provided with a sprocket I, the rear side of the winding roller is fixedly provided with a sprocket II, and the sprocket I is in transmission connection with the sprocket II through a toothed belt.

The preferable technical scheme is as follows: the winding roller is sleeved with an I-shaped cylinder, the surface of the I-shaped cylinder is stuck with a double-sided adhesive tape, the front side of the winding roller is connected with a screwing screw in a threaded connection mode, the screwing screw is positioned on the left side of the central axis of the winding roller, a tightening pressing plate is fixedly arranged at the front end of the screwing screw, and the length of the tightening pressing plate is smaller than the maximum distance between the central axis of the screwing screw and the outer edge of the winding roller.

The preferred technical scheme is as follows: the cutting knife comprises an L-shaped bent knife, the front and the back of the bidirectional threaded rod are symmetrically connected with the L-shaped bent knife in a threaded connection mode, and the upper end of the L-shaped bent knife is provided with a chamfer, a material guiding chamfer.

The eighth preferred technical scheme is as follows: the telescopic support column I comprises a square column I, the opposite ends of the adjacent left clamping columns are fixedly connected with a square column I, the outer end of the middle of the square column I is connected with a square frame plate I in a sliding fit mode, the middle of the square frame plate I is connected with a square moving block I in a sliding fit mode, a cylindrical spring is fixedly installed between the square moving blocks I and between the square moving block I and the square column I, the right end of the square frame plate I is fixedly provided with an extrusion hemisphere, and the right end of the extrusion hemisphere is flush with the right end of the magnetic attraction block.

The invention has the following beneficial effects: 1. according to the stretching equipment for the BOPP film, the thick sheet processed by the casting machine is flattened and conveyed through the conveying unit, so that the thick sheet smoothly enters the stretching unit, synchronous biaxial stretching treatment is carried out on the thick sheet through the stretching unit, before stretching, the stretching points of the thick sheet are increased through adding additional contact points, so that the deformation points of the edge of the stretched film are increased, the deformation width of the edge of the film is reduced, the width of the edge of the film to be cut off is reduced, the processing utilization rate of the equipment is improved, the film is rolled through the rolling unit, the rolled film can be rapidly separated from the equipment, the stop working time of the equipment is shortened, and the processing efficiency of the equipment is improved.

2. According to the conveying unit provided by the invention, the position of the round table block is changed by rotating the threaded column, so that the extension length of the extension column is changed, the extrusion column is clung to the thick sheet, the purposes of extruding and conveying the thick sheet are achieved, the thick sheet is ensured to be in a flat state when entering the stretching unit, and the difficulty of the stretching unit in stretching the thick sheet is reduced.

3. According to the stretching unit provided by the invention, the filter plate is used for preventing impurities contained in gas from polluting the surface of the film, the quality of the film is influenced, and the heat generated by the electric heating wire is prevented from contacting the outside through the heat preservation sleeve, so that the heat is dissipated, and the processing cost is increased.

4. According to the stretching unit, the thick plates between the pair of adjacent left clamping columns are subjected to point division positioning through the telescopic supporting columns, so that the number of points for clamping and positioning the thick plates is increased under the condition that the left clamping columns are not increased, the deformation amount between the deformed points of the stretched thick plates is reduced, the width of the thin film edge to be cut is reduced, the amount of waste materials generated in the thin film processing process is reduced, and the utilization rate of the thin film processing device is improved.

5. According to the winding unit, the tightening screw is rotated to control the tightening plate to realize the relative fixation between the I-shaped cylinder and the winding roller, so that the I-shaped cylinder is positioned or quickly disassembled, the thick plates are extruded and positioned through the extrusion hemisphere, the square frame plates are uniformly distributed among the left clamping columns through the cylindrical springs, and the thick plates among the left clamping columns are uniformly stressed.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic view of a front view plane structure of the present invention.

Fig. 3 is a cross-sectional view taken along the direction A-A of fig. 2 in accordance with the present invention.

Fig. 4 is a schematic view of a partially cut-away plan view structure of the present invention.

Fig. 5 is a sectional view taken along the direction B-B of fig. 4 in accordance with the present invention.

Fig. 6 is an enlarged view of a portion at N of fig. 4 in accordance with the present invention.

Fig. 7 is a partial enlarged view at M of fig. 5 according to the present invention.

Fig. 8 is a schematic rear plan view of the present invention.

Fig. 9 is a schematic perspective view of a left clamping frame and a right clamping frame according to the present invention.

Fig. 10 is an enlarged view of a portion of fig. 5 at E in accordance with the present invention.

Fig. 11 is a partial enlarged view at F of fig. 9 according to the present invention.

Fig. 12 is a partial enlarged view of G of fig. 4 according to the present invention.

Fig. 13 is a partial enlarged view of H of fig. 4 in accordance with the present invention.

FIG. 14 is a diagram showing the comparison of the film states of the first and second support columns before and after use.

In the figure: 1. a conveying unit; 11. a work table; 12. a conveying roller; 13. a first gear; 14. a second motor; 15. a threaded column; 16. round table blocks; 17. a sliding fit groove; 18. extending the column; 19. a positioning bracket; 20. an extrusion column; 2. a stretching unit; 21. an oven; 211. a rectangular plate; 212. rectangular through holes; 213. a guide block; 214. grid pipes; 215. a conical air outlet; 216. an air pump; 217. a thread-shaped air inlet pipe; 218. a filter plate; 219. a thermal insulation sleeve; 220. heating wires; 22. an electric push rod; 23. a left clamping frame; 231. a control board; 232. a left clamping column; 233. a V-shaped hinge rod; 234. a connecting rod; 235. a rectangular connecting plate; 236. an electric telescopic rod; 237. a magnetic suction block; 238. a first telescopic support column; 2381. square column I; 2382. square frame plate I; 2383. square moving block I; 2384. a cylindrical spring; 2385. extruding the hemisphere; 24. a right clamping frame; 241. a clamping cylinder; 242. an inverted Z-shaped plate; 243. a right clamping column; 244. an electromagnetic plate; 245. a retractable support post II; 25. a feeding frame; 251. a first feeding column; 252. a second material feeding column; 253. a second gear; 254. a sprocket I; 255. a second chain wheel; 256. a toothed chain belt; 3. a winding unit; 31. fixing the vertical plate; 32. a wind-up roll; 321. an I-shaped barrel; 322. double-sided adhesive tape; 323. screwing the screw rod; 324. a pressing plate; 33. a first motor; 34. a two-way threaded rod; 35. a cutting knife; 351. an L-shaped curved knife; 352. guiding and chamfering; 36. a guide rod.

Description of the embodiments

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1, a stretching device for BOPP films comprises a conveying unit 1, a stretching unit 2 and a winding unit 3, wherein the stretching unit 2 is fixedly installed on the conveying unit 1, and the winding unit 3 is fixedly installed at the lower end of the stretching unit 2.

Referring to fig. 1 and 9, the stretching unit 2 includes an oven 21, the oven 21 is fixedly mounted on the conveying unit 1, electric push rods 22 are symmetrically and fixedly mounted inside the oven 21, the ends of the electric push rods 22 are fixedly mounted with left clamping frames 23, the right ends of the left clamping frames 23 are fixedly mounted with right clamping frames 24, and the lower side of the oven 21 is rotatably connected with a feeding frame 25; firstly, the thick sheet from the casting machine is conveyed into the oven 21 through the conveying unit 1, the thick sheet is heated by the oven 21 to reach the stretching temperature, at this time, the thick sheet is clamped by the left clamping frame 23 and the right clamping frame 24, the thick sheet is stretched transversely and longitudinally, and the stretched film is flattened and conveyed by the feeding frame 25.

With continued reference to fig. 1, fig. 4, fig. 5 and fig. 9, the winding unit 3 includes a fixed vertical plate 31, a fixed vertical plate 31 is fixedly mounted at the lower end of the oven 21, a winding roller 32 is rotatably connected at the front end of the fixed vertical plate 31, a motor 33 is fixedly mounted at the rear end of the fixed vertical plate 31 through a motor base, an output shaft of the motor 33 is fixedly connected with the winding roller 32 through a coupling, a bidirectional threaded rod 34 is rotatably connected at the front end of the fixed vertical plate 31, thread grooves with opposite rotation directions are formed in the front side and the rear side of the bidirectional threaded rod 34, cutting knives 35 are symmetrically connected in a threaded connection manner in front and rear directions of the bidirectional threaded rod 34, and a guide rod 36 penetrating through the cutting knives 35 is fixedly mounted at the front end of the fixed vertical plate 31; the flattened film is conveyed to the wind-up roll 32 and positioned, the distance between the cutting knives 35 is adjusted according to the final stretching positions of the left clamping frame 23 and the right clamping frame 24, so that the distance between the cutting knives 35 is the same as the distance between the left clamping frames 23 during final stretching, the distance between the right clamping frames 24 is always equal to the distance between the left clamping frames 23, the edge of the stretched film is cut through the cutting knives 35, the wind-up roll 32 is driven to rotate through the motor one 33, and the cut film is wound.

Referring to fig. 4, 5, 8 and 12, the conveying unit 1 includes a workbench 11, a conveying roller 12 is symmetrically and rotatably connected to the left and right sides of the front end of the workbench 11, a first gear 13 is fixedly mounted at the rear end of the conveying roller 12, the first gear 13 is meshed, a second motor 14 is fixedly mounted at the rear end of the workbench 11 through a motor base, an output shaft of the second motor 14 is fixedly connected with the first gear 13 at the left side through a coupling, a threaded column 15 is rotatably connected to the middle part of the conveying roller 12, a round table block 16 with a small diameter end horizontally rearward is connected to the threaded column 15 in a threaded manner, a sliding fit groove 17 is uniformly formed at the outer end of the conveying roller 12, an extending column 18 is connected to the inclined surface of the round table block 16 in a sliding fit manner, a positioning bracket 19 is fixedly mounted at the tail end of the extending column 18, and an extrusion column 20 is rotatably connected to the positioning bracket 19; the motor II 14 drives the left gear I13 to rotate, the conveying rollers 12 on the left side and the right side rotate in opposite directions under the cooperation of the right gear I13, the conveying speed of the thick sheet is controlled according to the rotating speed of the conveying rollers 12, the round table block 16 moves horizontally and backwards through the rotating threaded column 15, the extending column 18 moves towards the outside of the sliding fit groove 17 along the radial direction of the conveying rollers 12 under the action of the inclined surface of the round table block 16, the extending length of the extending column 18 is increased, and then the distance between the extruding column 20 and the axis of the conveying rollers 12 is increased, so that the extruding column 20 can adapt to the thickness change of the thick sheet and is tightly attached to the thick sheet.

Referring to fig. 4 and 13, the oven 21 includes a rectangular plate 211, a rectangular through hole 212 is formed in the middle of the rectangular plate 211, a guide block 213 is fixedly mounted at the upper end of the left clamping frame 23, a grid pipeline 214 is fixedly mounted on the inner wall of the rectangular plate 211, a conical air outlet 215 penetrating through the rectangular plate 211 is uniformly and fixedly mounted on the grid pipeline 214, an air pump 216 is fixedly mounted at the right end of the oven 21, a threaded air inlet pipe 217 is fixedly mounted at the right end of the air pump 216, a filter plate 218 is fixedly mounted at the air inlet of the threaded air inlet pipe 217, a heat insulation sleeve 219 is fixedly mounted at the outer end of the threaded air inlet pipe 217, and an electric heating wire 220 is fixedly mounted in the heat insulation sleeve 219; the air heated by the electric heating wire 220 is led into the grid pipeline 214 through the air pump 216, finally discharged through the conical air outlet 215, the air heating path is increased through the threaded air inlet pipe 217, impurities contained in the air are prevented from polluting the surface of the film through the filter plate 218, the heat generated by the electric heating wire 220 is prevented from contacting with the outside through the heat preservation sleeve 219, so that heat is dissipated, and thick plates smoothly enter between the left clamping frame 23 and the right clamping frame 24 through the guide block 213.

Referring to fig. 4, fig. 5, fig. 9, fig. 10 and fig. 11, the left clamping frame 23 includes a control board 231, the end of the electric push rod 22 is fixedly provided with the control board 231, opposite ends of the control board 231 are connected with left clamping columns 232 in a manner of sliding up and down, the left clamping column 232 at the most middle is fixedly connected with the control board 231, the middle parts of adjacent left clamping columns 232 are hinged with V-shaped hinging rods 233 together, each V-shaped hinging rod 233 consists of two rods connected in a coaxial rotation manner, one end of each V-shaped hinging rod 233, which is close to one end of the control board 231, is connected with a connecting rod 234 in a manner of sliding fit together, the middle part of the control board 231 is fixedly provided with an electric telescopic rod 236, the end of the electric telescopic rod 236 is fixedly connected with the rectangular connecting plate 235, the right end of each left clamping column 232 is fixedly provided with a magnetic block 237, the right ends of the adjacent left clamping columns 232 are fixedly connected with a telescopic supporting column 238 together, and the right ends of the telescopic supporting columns 238 are aligned with the right ends of the magnetic blocks 237; after the left clamping frame 23 and the right clamping frame 24 clamp the thick sheet, the electric push rod 22 drives the control panel 231 to move back to back, the thick sheet is transversely stretched, and meanwhile, the electric telescopic rod 236 drives the rectangular connecting plate 235 and the connecting rod 234 to move back to back, so that the opening angle of the V-shaped hinging rod 233 is increased, the distance between the left clamping columns 232 is increased, the thick sheet is longitudinally stretched, the aim of transversely and longitudinally synchronously stretching the thick sheet is finally achieved, when the distance between the left clamping columns 232 is increased, the extension length of the first telescopic support column 238 is simultaneously increased, the first telescopic support column 238 is synchronously contacted with the thick sheet with the left clamping columns 232, the thick sheet between the adjacent left clamping columns 232 is subjected to point division positioning through the first telescopic support column 238, the number of positioning points is further increased on the number of the positioning points formed by the original left clamping columns 232, the surface of the thick sheet is uniformly distributed with stretching points, the thick sheet is further subjected to the effect of uniform stretching force, the deformation between the deformation points after the thick sheet is ensured, the thin sheet is reduced, the width of the thin film edge to be cut is reduced, the waste is reduced, and the processing rate of the thin film is improved.

Referring to fig. 4, fig. 5, fig. 6, fig. 9 and fig. 11, the right clamping frame 24 includes a clamping cylinder 241, a clamping cylinder 241 is fixedly mounted at the right end of the control board 231, an inverted Z-shaped plate 242 is fixedly mounted at the right end of the clamping cylinder 241, right clamping columns 243 are connected to opposite ends of the inverted Z-shaped plate 242 in a sliding fit manner, the right clamping columns 243 are uniformly arranged, the right clamping columns 243 in the middle are fixedly connected with the inverted Z-shaped plate 242, an electromagnetic plate 244 is fixedly mounted at the left end of the right clamping columns 243, round corners are formed at the outer ends of the electromagnetic plate 244 and the magnetic attraction block 237, a second telescopic support column 245 is fixedly connected between the right clamping columns 243, and the left end of the second telescopic support column 245 is aligned with the left end of the electromagnetic plate 244; the inverted Z-shaped plate 242 is driven to move towards the control plate 231 by the clamping cylinder 241, so that the electromagnetic plate 244 on the right clamping column 243 is tightly attached to the thick plate, the electromagnetic plate 244 is electrified at the moment, the magnetic attraction block 237 and the electromagnetic plate 244 are attracted by the thick plate, when the distance between the left clamping column 232 is increased, the left clamping column 232 can drive the right clamping column 243 to synchronously move under the condition that the magnetic attraction block 237 and the electromagnetic plate 244 are attracted, the second telescopic support column 245 and the first telescopic support column 238 are matched to clamp the thick plate synchronously, and the thick plate is clamped and positioned at multiple points by the operation.

Referring to fig. 2, 3 and 8, the feeding frame 25 includes a first feeding column 251, a first feeding column 251 is rotatably connected to the lower side of the inner portion of the oven 21, a second feeding column 252 is rotatably connected to the right side of the first feeding column 251 in the oven 21, a second gear 253 is fixedly mounted at the rear ends of the first feeding column 251 and the second feeding column 252, the second gear 253 is meshed, a first sprocket 254 is fixedly mounted at the rear end of the second gear 253 on the right side, a second sprocket 255 is fixedly mounted at the rear side of the wind-up roll 32, and the first sprocket 254 is in transmission connection with the second sprocket 255 through a toothed chain 256; the first sprocket 254, the second sprocket 255 and the toothed belt 256 are matched to achieve the purpose of driving the second gear 253 to rotate through the first motor 33, so that the first feeding column 251 and the second feeding column 252 are driven to rotate in opposite directions, the film is flattened and conveyed, and the conveying speed is controlled.

Referring to fig. 3-5 and fig. 9, the winding roller 32 is sleeved with an i-shaped cylinder 321, a double-sided adhesive tape 322 is attached to the surface of the i-shaped cylinder 321, a screwing screw 323 is connected to the front side of the winding roller 32 in a threaded connection manner, the screwing screw 323 is positioned on the left side of the central axis of the winding roller 32, a tightening pressure plate 324 is fixedly arranged at the front end of the screwing screw 323, and the length of the tightening pressure plate 324 is smaller than the maximum distance between the central axis of the screwing screw 323 and the outer edge of the winding roller 32; the film is rolled up through the I-shaped barrel 321, the film is positioned through the double-sided adhesive tape 322, the pressing plate 324 in an initial state is kept horizontal and integrally located on the left side of the central axis of the winding roller 32, the pressing plate 324 stops the I-shaped barrel 321, the I-shaped barrel 321 cannot be taken down from the winding roller 32, after the film is rolled up by the I-shaped barrel 321, the pressing plate 324 is integrally located in the range of the lateral end face of the winding roller 32 through clockwise rotation of the screwing screw 323, the pressing plate 324 does not stop the I-shaped barrel 321 any more, and the I-shaped barrel 321 can be taken down smoothly.

Referring to fig. 4, the cutting blade 35 includes an L-shaped bending blade 351, the bidirectional threaded rod 34 is connected with the L-shaped bending blade 351 in a threaded connection manner, and a material guiding chamfer 352 is provided at the upper end of the L-shaped bending blade 351; the edge of the film is cut by the L-shaped curved knife 351, and the cut edge of the film is smoothly dropped by the guide chamfer 352, so that waste is prevented from accumulating on the L-shaped curved knife 351, and the cutting of the L-shaped curved knife 351 is affected.

Referring to fig. 6 and 7, the first telescopic support column 238 includes a first square column 2381, opposite ends of adjacent left clamping columns 232 are fixedly connected with a first square column 2381, an outer end of a middle portion of the first square column 2381 is connected with a first square frame plate 2382 in a sliding fit manner, a middle portion of the first square frame plate 2382 is connected with a first square moving block 2383 in a sliding fit manner, cylindrical springs 2384 are fixedly installed between the first square moving blocks 2383 and between the first square moving block 2383 and the first square column 2381, an extrusion hemisphere 2385 is fixedly installed at a right end of the first square frame plate 2382, and a right end of the extrusion hemisphere 2385 is flush with a right end of the magnetic attraction block 237; the thick plates are extruded and positioned through the extrusion hemispheres 2385, and the first square frame plates 2382 are uniformly distributed among the left clamping columns 232 through the cylindrical springs 2384, so that the thick plates among the left clamping columns 232 are uniformly stressed.

During specific work, firstly, a thick sheet from a casting machine is conveyed into an oven 21 through a conveying unit 1, the thick sheet is heated through the oven 21 to reach stretching temperature, at the moment, the thick sheet is clamped through a left clamping frame 23 and a right clamping frame 24, the thick sheet is transversely and longitudinally stretched, a stretched film is flattened and conveyed through a feeding frame 25, the flattened film is conveyed to a winding roller 32 and positioned, the distance between cutting knives 35 is adjusted according to the final stretching positions of the left clamping frame 23 and the right clamping frame 24, the distance between the cutting knives 35 is the same as the final stretching distance between the left clamping frame 23 and the right clamping frame 24, edges of the stretched and deformed film are cut through the cutting knives 35, the winding roller 32 is driven to rotate through a motor 33, and the cut film is wound.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. Stretching equipment for BOPP film, including conveying unit (1), stretching unit (2) and rolling unit (3), its characterized in that: a stretching unit (2) is fixedly arranged on the conveying unit (1), and a winding unit (3) is fixedly arranged at the lower end of the stretching unit (2); wherein:

the stretching unit (2) comprises an oven (21), the oven (21) is fixedly arranged on the conveying unit (1), electric push rods (22) are symmetrically and fixedly arranged in the oven (21) in front and back, left clamping frames (23) are fixedly arranged at the tail ends of the electric push rods (22), right clamping frames (24) are fixedly arranged at the right ends of the left clamping frames (23), and a feeding frame (25) is rotatably connected to the lower side of the oven (21);

the winding unit (3) comprises a fixed vertical plate (31), the lower end of the oven (21) is fixedly provided with the fixed vertical plate (31), the front end of the fixed vertical plate (31) is rotationally connected with a winding roller (32), the rear end of the fixed vertical plate (31) is fixedly provided with a motor I (33) through a motor base, an output shaft of the motor I (33) is fixedly connected with the winding roller (32) through a coupler, the front end of the fixed vertical plate (31) is rotationally connected with a bidirectional threaded rod (34), the front side and the rear side of the bidirectional threaded rod (34) are provided with thread grooves with opposite rotation directions, the front side and the rear side of the bidirectional threaded rod (34) are symmetrically connected with cutting knives (35) in a threaded connection mode, and the front end of the fixed vertical plate (31) is fixedly provided with guide rods (36) penetrating the cutting knives (35);

the drying oven (21) comprises a rectangular plate (211), a rectangular through hole (212) is formed in the middle of the rectangular plate (211), a guide block (213) is fixedly arranged at the upper end of the left clamping frame (23), a grid pipeline (214) is fixedly arranged on the inner wall of the rectangular plate (211), a conical air outlet (215) penetrating through the rectangular plate (211) is uniformly and fixedly arranged on the grid pipeline (214), an air pump (216) is fixedly arranged at the right end of the drying oven (21), a threaded air inlet pipe (217) is fixedly arranged at the right end of the air pump (216), a filter plate (218) is fixedly arranged at the air inlet of the threaded air inlet pipe (217), a heat preservation sleeve (219) is fixedly arranged at the outer end of the threaded air inlet pipe (217), and an electric heating wire (220) is fixedly arranged in the heat preservation sleeve (219);

the left clamping frame (23) comprises a control plate (231), the tail end of the electric push rod (22) is fixedly provided with the control plate (231), the opposite ends of the control plate (231) are respectively connected with a left clamping column (232) in an up-down sliding fit mode, the left clamping column (232) at the most middle part is fixedly connected with the control plate (231), the middle parts of the adjacent left clamping columns (232) are jointly hinged with V-shaped hinging rods (233), each V-shaped hinging rod (233) consists of two rods which are coaxially and rotatably connected, one end, close to the control plate (231), of the middle part of each V-shaped hinging rod (233) is rotatably connected with a connecting rod (234), the connecting rods (234) are jointly connected with a rectangular connecting plate (235) in a sliding fit mode, the middle part of the control plate (231) is fixedly provided with an electric telescopic rod (236), the right ends of the electric telescopic rods (236) are fixedly connected with the rectangular connecting plates (235), the right ends of the telescopic supporting columns (238) are jointly fixedly connected with magnetic blocks (237), and the right ends of the telescopic supporting columns (238) are aligned with the right ends of the magnetic blocks (237);

the right clamping frame (24) comprises a clamping cylinder (241), the right end of the control board (231) is fixedly provided with the clamping cylinder (241), the right end of the clamping cylinder (241) is fixedly provided with an inverted Z-shaped plate (242), the opposite ends of the inverted Z-shaped plate (242) are respectively connected with a right clamping column (243) in a sliding fit mode, the right clamping columns (243) are uniformly distributed, the right clamping columns (243) in the middle are fixedly connected with the inverted Z-shaped plate (242), the left end of the right clamping columns (243) is fixedly provided with an electromagnetic plate (244), the outer ends of the electromagnetic plate (244) and the magnetic attraction block (237) are respectively provided with a round angle, the right clamping columns (243) are fixedly connected with a telescopic support column II (245) together, and the left ends of the telescopic support column II (245) are aligned with the left ends of the electromagnetic plate (244);

the telescopic support column I (238) comprises a square column I (2381), the opposite ends of the adjacent left clamping columns (232) are fixedly connected with a square column I (2381), the outer end of the middle of the square column I (2381) is connected with a square frame plate I (2382) in a sliding fit mode, the middle of the square frame plate I (2382) is connected with a square moving block I (2383) in a sliding fit mode, cylindrical springs (2384) are fixedly installed between the square moving block I (2383) and the square column I (2381), the right end of the square frame plate I (2382) is fixedly provided with an extrusion hemisphere (2385), and the right end of the extrusion hemisphere (2385) is flush with the right end of the magnetic attraction block (237).

2. The stretching apparatus for BOPP films according to claim 1, wherein: the conveying unit (1) comprises a workbench (11), a conveying roller (12) is symmetrically and rotationally connected to the left side and the right side of the front end of the workbench (11), a first gear (13) is fixedly installed at the rear end of the conveying roller (12), the first gear (13) is meshed, a second motor (14) is fixedly installed at the rear end of the workbench (11) through a motor base, an output shaft of the second motor (14) is fixedly connected with the first gear (13) on the left side through a coupler, a threaded column (15) is rotationally connected to the middle of the conveying roller (12), a round platform block (16) with a small-diameter end horizontally and backwards is connected to the threaded column (15) in a threaded mode, a sliding fit groove (17) is uniformly formed in the outer end of the conveying roller (12), an extending column (18) is connected in a sliding fit mode in the sliding fit groove (17), a positioning support (19) is fixedly installed at the tail end of the extending column (18), and an extrusion column (20) is rotationally connected to the positioning support (19).

3. The stretching apparatus for BOPP films according to claim 1, wherein: the feeding frame (25) comprises a feeding column I (251), the feeding column I (251) is rotationally connected to the lower side inside the drying oven (21), a feeding column II (252) is rotationally connected to the right side inside the drying oven (21) and located on the feeding column I (251), a gear II (253) is fixedly installed at the rear end of the feeding column I (251) and the rear end of the feeding column II (252), the gear II (253) is meshed, a sprocket I (254) is fixedly installed at the rear end of the gear II (253) on the right side, a sprocket II (255) is fixedly installed at the rear side of the winding roller (32), and the sprocket I (254) is in transmission connection with the sprocket II (255) through a toothed chain belt (256).

4. The stretching apparatus for BOPP films according to claim 1, wherein: the winding roller (32) is sleeved with an I-shaped cylinder (321), a double-sided adhesive tape (322) is adhered to the surface of the I-shaped cylinder (321), a screwing screw (323) is connected to the front side of the winding roller (32) in a threaded connection mode, the screwing screw (323) is located on the left side of the central axis of the winding roller (32), a tightening pressure plate (324) is fixedly arranged at the front end of the screwing screw (323), and the length of the tightening pressure plate (324) is smaller than the maximum distance between the central axis of the screwing screw (323) and the outer edge of the winding roller (32).

5. The stretching apparatus for BOPP films according to claim 1, wherein: the cutting knife (35) comprises an L-shaped bent knife (351), the two-way threaded rod (34) is connected with the L-shaped bent knife (351) in a front-back symmetrical threaded connection mode, and a chamfer material guiding chamfer (352) is formed at the upper end of the L-shaped bent knife (351).