Biaxial stretching equipment for polypropylene film processing
By setting up a rotating seat in the polypropylene film processing equipment to bending and lock the edge of the film, the problem of the film being prone to wrinkles or breaks during the bidirectional stretching process in the prior art, and a more stable and durable film stretching is achieved. Effect.
Patent Information
- Application Number
- CN202411674061.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-02-07
AI Technical Summary
In the prior art, when a bidirectional stretcher bidirectional stretching of a single piece of film that has been cut, the contact area between the fixture and the film is small, resulting in a large pressure and pulling force at the clamping position, which can easily cause the film to wrinkle. Or broken.
By setting up a rotating seat, the edge of the film is bent at 90 degrees, and locked by the rotating seat and the positioning seat, the pressure and pulling force applied to the clamped position of the film during the stretching process are reduced.
It effectively avoids damage to the membrane clamping position and improves the stability and durability of the membrane during stretching.
Smart Images
Figure CN119388738A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of polypropylene film processing, and more specifically to a biaxial stretching device for polypropylene film processing. Background Art
[0002] The biaxial stretching process of polypropylene film is an important plastic film processing technology. It involves processing the polypropylene raw material into a film with excellent performance through a series of steps. The biaxially oriented polypropylene film (BOPP) is made by co-extruding polypropylene particles into a sheet and then stretching it in the longitudinal and transverse directions. This process uses physical means to specially treat the polypropylene film, thereby giving it unique properties.
[0003] The purpose of biaxial stretching of polypropylene film is mainly to improve and optimize the physical and chemical properties of the film. After biaxial stretching, the polymer chains in the polypropylene film will be arranged and oriented along the direction of the force, which significantly increases the tensile strength and elastic modulus of the film, and significantly improves the mechanical strength, which helps the film to maintain better stability and durability when subjected to external forces. Biaxial stretching makes the molecular chains of the polypropylene film more tightly arranged, thereby improving its air tightness and moisture resistance, which is of great significance for application areas that need to prevent gas or moisture penetration (such as food packaging, pharmaceutical packaging, etc.).
[0004] In the prior art, when a biaxial stretching apparatus performs biaxial stretching on a single piece of cut film, a clamp is usually used to clamp one side of the film at multiple locations. However, since the contact area between the clamp and the film is small, the pressure and pulling force on the clamping position are relatively large, which can easily cause obvious wrinkles or even damage to the film. Summary of the invention
[0005] In view of the problems existing in the prior art, the object of the present invention is to provide a biaxial stretching device for polypropylene film processing.
[0006] To solve the above problems, the present invention adopts the following technical solution, which can achieve that the edge of the film is bent ninety degrees above the positioning seat, and locked by the rotating seat and the positioning seat, so that the pressure and pulling force on the clamping position of the film during the stretching process are reduced.
[0007] A biaxial stretching device for processing polypropylene film, comprising an operating box and a workbench slidably connected to the inside of the operating box, wherein a screw drive is arranged inside the workbench, and the screw drive consists of a double-axis motor, a screw, a screw nut and a guide rod, the double-axis motor is fixedly installed inside the workbench, the screw is installed at the output end of the double-axis motor, the screw nut is movably installed on the outside of the screw, and the guide rod is fixedly installed on both sides of the workbench, characterized in that: a locking component is arranged on the outside of the workbench;
[0008] The locking component includes two first connecting plates sleeved on the outside of the screw nut, the two first connecting plates are slidably connected to the outside of the two guide rods, the upper sides of the two first connecting plates are hinged with pre-laid brackets, the two pre-laid brackets are slidably connected to the upper side of the workbench, the front and rear ends of the two pre-laid brackets are fixedly connected with two racks, the opposite surfaces of the two first connecting plates are fixedly connected with push plates, the rear end of the upper push plate and the front end of the lower push plate are both provided with inclined surfaces, the push plate located above is in sliding contact with the push plate located below, and the inclined surfaces of the two push plates are in extrusion contact with trapezoidal plates.
[0009] Furthermore, a bidirectional stretching component is provided inside the workbench, and the bidirectional stretching component includes first movable grooves opened on the left and right sides of the workbench, and the number of the first movable grooves on one side is multiple, and a second movable groove is opened inside the workbench, and the number of the second movable grooves is two, and the two second movable grooves are staggered, and the first tension spring is fixedly connected to one side of the multiple first movable grooves away from the first connecting plate, and the pressure spring is fixedly connected to one side of the two second movable grooves away from each other, and the number of the pressure springs is multiple.
[0010] Furthermore, a second connecting plate is slidably connected inside each of the multiple first movable grooves and the two second movable grooves, a multiple second connecting plates located on the front and rear sides are respectively slidably connected in the two second movable grooves, a multiple second connecting plates located on the left and right sides are respectively slidably connected in the multiple first movable grooves, the other end of the first tension spring is fixedly connected to a side of the second connecting plate in the first movable groove close to the workbench, a support plate is slidably connected in each of the two second movable grooves, the other end of the multiple pressure springs is fixedly connected to a side of the support plate away from the trapezoidal plate, and the other side of the support plate is in sliding contact with a side of the trapezoidal plate close to the support plate.
[0011] Furthermore, a plurality of the second connecting plates are hingedly connected to a hinge seat on one side away from the workbench, a plurality of the upper sides of the hinge seats are rotatably connected to a positioning seat, and a rotating seat is hingedly connected to the outer sides of the plurality of the positioning seats on one side, and a gear is fixedly connected to the front and rear sides of the two rotating seats on the left sides, and a first magnetic block is fixedly connected to the side away from the two rotating seats on the front and rear sides, and the positioning seat and the pre-laid bracket are both made of metal, and after the two front and rear rotating seats rotate, they are laid above the plurality of positioning seats on the same side and are magnetically adsorbed to the corresponding plurality of positioning seats through the first magnetic block, and the two pre-laid brackets are fixedly connected to the opposite surfaces of the two front and rear rotating seats with a second magnetic block, and the number of the second magnetic blocks arranged on one side of the opposite surfaces of the two front and rear rotating seats is two, and the opposite surfaces of the corresponding two second magnetic blocks are magnetically adsorbed, and after the two pre-laid brackets move to both sides, they respectively push the plurality of positioning seats and the rotating seats on the left and right sides, and the two racks are meshed with the gears after being moved by the pre-laid brackets, and the gears drive the rotating seat to rotate after meshing with the racks.
[0012] Furthermore, an adsorption assembly is provided on the upper side of the workbench, and the adsorption assembly includes a through hole starting from the upper side of the workbench. There are multiple through holes, and the multiple through holes are respectively connected to the two second movable grooves.
[0013] Furthermore, a flattening assembly is provided on the outer side of the first connecting plate, and the flattening assembly includes a second tension spring fixedly connected to the opposite surfaces of the two first connecting plates, and the number of the second tension springs is two, and the other ends of the two second tension springs are respectively fixedly connected to the lower sides of two pre-laid brackets, and the pre-laid brackets are in a "T" shape.
[0014] Furthermore, a preheating assembly is provided on the outer side of the two pre-laid brackets, a delivery pipe is fixedly installed on the upper side of the pre-laid bracket, the other end of the delivery pipe is connected to an external heating device, and an exhaust hole is opened on the lower side of the pre-laid bracket, and the number of the exhaust holes is multiple.
[0015] Furthermore, a material-removing component is provided on the outer side of the workbench, and the material-removing component includes an extension plate fixedly connected to a side away from two pre-laid brackets, and the number of the extension plates on a single side is two.
[0016] Furthermore, a plurality of the extension plates are fixedly connected to the lower sides with a magnetic strip, a lifting plate is clamped on the upper side of the workbench, and the number of the lifting plates is multiple, a plurality of the lifting plates are fixedly connected to the lower sides with a limiting rod, a limiting groove is provided on the upper side of the workbench, and the number of the limiting grooves is multiple, a plurality of the limiting rods are respectively slidably connected in the plurality of limiting grooves, and are arranged on the upper sides of the two lifting plates on the same side after the front and rear rotating seats are rotated, the lifting plate is made of metal, and the extension plate is located above the lifting plate, and the magnetic strip moves to the top of the lifting plate and adsorbs the lifting plate, and after the lifting plate and the magnetic strip are adsorbed, they move upward together with the limiting rod and push the rotating seat upward.
[0017] Furthermore, the inside and outside of the workbench are jointly provided with an air blowing assembly, and the air blowing assembly includes an air blowing pipe fixedly installed inside the workbench, and the number of the air blowing pipes is two, and a sealing plate is fixedly connected to one side of the jacking plate close to the first connecting plate, and one end of the air blowing pipe close to the workbench is in extrusion contact with the lower side of the sealing plate, and the other end of the air blowing pipe is connected to an external air supply device.
[0018] Compared with the prior art, the present invention has the following beneficial effects:
[0019] (1) The rotating seat provided in the present invention will cause a 90-degree bend at the edge of the film after rotation, and finally lock the film. Before the film is stretched, the rotating seat rotates so that the edge of the film is bent 90 degrees above the positioning seat, and is locked by the rotating seat and the positioning seat. Therefore, the pressure and pulling force on the clamping position of the film during the stretching process are reduced, thereby avoiding damage to the clamping position of the film.
[0020] (2) The support plate of the present invention will draw air from the outside through the through hole during the pushing process, and the film covers the through hole, and the generated suction force will adsorb the film. Since the support plate inside the second movable groove will draw air from the outside through the through hole during the pushing process, the film is adsorbed above the placement table. As the support plate is continuously pushed, the suction force generated inside the through hole will continue to act on the bottom of the film to prevent the film from being displaced from the upper side of the workbench and affecting the subsequent locking effect of the film.
[0021] (3) The present invention uses a pre-laid support to press the film during film stretching so that the film is flattened. Since the pre-laid support moves with the first connecting plate and continuously presses the film, it can not only press the film above the workbench, but also pre-lay the film before stretching to ensure the flatness of the film and make it easier to deform during the stretching process. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a structural schematic diagram of the present invention;
[0023] Figure 2 It is a cross-sectional structural schematic diagram of the present invention;
[0024] Figure 3 It is a structural schematic diagram of the workbench of the present invention;
[0025] Figure 4 It is a schematic cross-sectional structural diagram of the workbench of the present invention;
[0026] Figure 5 is a schematic cross-sectional structural diagram of the first moving groove of the present invention;
[0027] Figure 6 It is a structural schematic diagram of the support plate of the present invention;
[0028] Figure 7 It is a structural schematic diagram of a trapezoidal plate of the present invention;
[0029] Figure 8 It is a schematic structural diagram of the rotating seat of the present invention;
[0030] Fig. 9 It is a schematic diagram of the structure of the pre-laid stent of the present invention;
[0031] Fig.10 It is a structural schematic diagram of the screw drive member of the present invention;
[0032] Fig.11 It is a schematic diagram of the cross-sectional structure of the second movable groove of the present invention.
[0033] Description of the numbers in the figure:
[0034] 1. Operation box; 2. Workbench; 3. Screw drive; 4. Locking component; 41. First connecting plate; 42. Pre-laid bracket; 43. Rack; 44. Push plate; 45. Trapezoidal plate; 46. Bidirectional stretching assembly; 461. First moving groove; 462. Second moving groove; 463. First tension spring; 464. Pressure spring; 465. Support plate; 466. Second connecting plate; 467. Hinge seat; 468. Positioning seat; 469. Rotation Seat; 4691, gear; 4692, first magnetic block; 4693, second magnetic block; 47, adsorption assembly; 471, through hole; 48, flattening assembly; 481, second tension spring; 49, preheating assembly; 491, conveying pipe; 492, exhaust hole; 5, material withdrawal component; 51, extension plate; 52, magnetic strip; 53, lifting plate; 54, limiting rod; 55, limiting groove; 56, blowing assembly; 561, blowing pipe; 562, blocking plate. DETAILED DESCRIPTION
[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.
[0036] See also Figures 1 to 11 A biaxial stretching device for processing polypropylene film, comprising an operating box 1 and a workbench 2 slidably connected to the inside of the operating box 1, a screw drive 3 is arranged inside the workbench 2, the screw drive 3 is composed of a double-axis motor, a screw, a screw nut and a guide rod, the double-axis motor is fixedly installed inside the workbench 2, the screw is installed at the output end of the double-axis motor, the screw nut is movably installed on the outside of the screw, and the guide rod is fixedly installed on both sides of the workbench 2, characterized in that: a locking component 4 is arranged on the outside of the workbench 2;
[0037] The locking component 4 includes two first connecting plates 41 sleeved on the outside of the screw nut, and the two first connecting plates 41 are respectively slidably connected to the outside of the two guide rods. The upper sides of the two first connecting plates 41 are hinged with pre-laid brackets 42, and the two pre-laid brackets 42 are slidably connected to the upper side of the workbench 2. Two racks 43 are fixedly connected to the front and rear ends of the side away from each other of the two pre-laid brackets 42. The opposite surfaces of the two first connecting plates 41 are fixedly connected with push plates 44. The rear end of the upper push plate 44 and the front end of the lower push plate 44 are both provided with inclined surfaces. The upper push plate 44 is in sliding contact with the lower push plate 44, and the inclined surfaces of the two push plates 44 are both squeezed and contacted with trapezoidal plates 45.
[0038] A bidirectional stretching component 46 is provided inside the workbench 2, and the bidirectional stretching component 46 includes a first movable groove 461 opened on the left and right sides of the workbench 2, and the number of the first movable grooves 461 on one side is multiple, and a second movable groove 462 is opened inside the workbench 2, and the number of the second movable grooves 462 is two, and the two second movable grooves 462 are staggered. The first tension spring 463 is fixedly connected to the side away from the first connecting plate 41 in the multiple first movable grooves 461, and the pressure spring 464 is fixedly connected to the side away from each other in the two second movable grooves 462, and the number of the pressure springs 464 is multiple.
[0039] The interiors of the multiple first movable grooves 461 and the two second movable grooves 462 are slidably connected with second connecting plates 466, the multiple second connecting plates 466 located on the front and rear sides are respectively slidably connected in the two second movable grooves 462, the multiple second connecting plates 466 located on the left and right sides are respectively slidably connected in the multiple first movable grooves 461, the other end of the first tension spring 463 is fixedly connected to the side of the second connecting plate 466 in the first movable groove 461 close to the workbench 2, the two second movable grooves 462 are both slidably connected with support plates 465, the other ends of the multiple pressure springs 464 are fixedly connected to the side of the support plate 465 away from the trapezoidal plate 45, and the other side of the support plate 465 is in sliding contact with the side of the trapezoidal plate 45 close to the support plate 465.
[0040] A plurality of second connecting plates 466 are hingedly connected to a hinge seat 467 on one side away from the workbench 2, and a plurality of hinge seats 467 are rotatably connected to a positioning seat 468 on the upper side, and a rotating seat 469 is hingedly connected to the outer side of the plurality of positioning seats 468 on one side, and the front and rear sides of the two rotating seats 469 on the left sides are fixedly connected to gears 4691, and the sides of the two rotating seats 469 on the front and rear sides away from each other are fixedly connected to a first magnetic block 4692, and the positioning seat 468 and the pre-laid bracket 42 are both made of metal, and the two rotating seats 469 on the front and rear sides are rotated to be set above the plurality of positioning seats 468 on the same side and connected to the opposite side through the first magnetic block 4692. The corresponding multiple positioning seats 468 are magnetically adsorbed, the two pre-laid brackets 42 and the opposite surfaces of the two front and rear rotating seats 469 are fixedly connected with second magnetic blocks 4693, the number of second magnetic blocks 4693 arranged on one side of the opposite surfaces of the two front and rear rotating seats 469 is two, and the corresponding opposite surfaces of the two second magnetic blocks 4693 are magnetically adsorbed, and the two pre-laid brackets 42 move to both sides and push the multiple positioning seats 468 and the rotating seat 469 on the left and right sides respectively, and the two racks 43 are moved by the pre-laid brackets 42 and meshed with the gear 4691, and the gear 4691 drives the rotating seat 469 to rotate after meshing with the rack 43.
[0041] By adopting the above technical solution, first push aside the pre-laid bracket 42, and place the film on the workbench 2 inside the operating box 1, then place the edge of the film on top of multiple positioning seats 468, and then start the double-axis motor of the screw drive 3 to slowly drive the two screws to rotate, and the two screw threads on the outside of the two screws will drive the first connecting plate 41 sleeved on the outside of the screw nut to move with the first connecting plate 41. During the movement, the first connecting plate 41 will be guided by the guide rods on both sides of the workbench 2. As the first connecting plate 41 starts to move, the pre-laid bracket 42 hinged to the first connecting plate 41 starts to move toward the positioning seats 468 and the rotating seats 469 on the left and right sides. In this process, the two first connecting plates 41 drives the two pushing plates 44 to move inside the workbench 2 respectively and contact with the corresponding trapezoidal plates 45. After the inclined surfaces of the two contact, the trapezoidal plates 45 will be pushed into the second moving grooves 462, so that the trapezoidal plates 45 push the corresponding multiple second connecting plates 466 through the supporting plates 465. At this time, the second connecting plates 466 push the positioning seats 468 to the opposite direction of the trapezoidal plates 45 through the hinge seats 467. At the same time, the pre-laid bracket 42 is pulled by the first connecting plate 41 to start moving, and the second magnetic blocks 4693 on both sides thereof will move away from the second magnetic blocks 4693 on the surfaces of the two rotating seats 469 on the front and rear sides, and the first magnetic block 4692 on the other side of the rotating seat 469 will turn the rotating seat 469 to the other side by its own weight. Finally, the first The magnetic block 4692 is adsorbed with multiple positioning seats 468. As the rotating seat 469 rotates, the film will be clamped between the rotating seat 469 and the positioning seat 468, and the film will be bent ninety degrees. Before the pre-laid bracket 42 contacts the rotating seats 469 and the positioning seats 468 on the left and right sides, the rack 43 on the side of the pre-laid bracket 42 will mesh with the two gears 4691 on the front and rear sides of the rotating seats 469 on the left and right sides. As the pre-laid bracket 42 continues to move, the rotating seat 469 starts to rotate, and the film will be clamped between the rotating seat 469 and the positioning seat 468 again, and the film will be bent ninety degrees. Subsequently, the positioning seat 468 and the rotating seat 469 are pulled, and the film is biaxially stretched at the same time. After the stretching is completed, the biaxial electric The machine will rotate in the opposite direction to bring the two first connecting plates 41 closer together. In the process of the pre-laid bracket 42 driving the rack 43 to leave the gear 4691, the gear 4691 will rotate in the opposite direction to release the lock between the rotating seat 469 and the film. At the same time, the first tension spring 463 inside the first movable groove 461 and the pressure spring 464 inside the second movable groove 462 will quickly pull the second connecting plate 466 and gradually reset it. Before the film is stretched, the rotating seat 469 rotates, so that the edge of the film is bent ninety degrees above the positioning seat 468, and is locked by the rotating seat 469 and the positioning seat 468, so that the pressure and pulling force on the clamping position of the film are reduced during the stretching process to avoid damage to the clamping position of the film.
[0042] like Figure 2 and Figure 5 As shown, an adsorption assembly 47 is provided on the upper side of the workbench 2 , and the adsorption assembly 47 includes a through hole 471 starting from the upper side of the workbench 2 . There are multiple through holes 471 , and the multiple through holes 471 are respectively connected to the two second movable grooves 462 .
[0043] By adopting the above technical solution, first, in the process of the trapezoidal block pushing the support plate 465, the support plate 465 will move inside the second movable groove 462, and the support plate 465 in the direction toward the pushing plate 44 has only the through hole 471 as a vent. After the support plate 465 moves, the external air pressure is greater than the air pressure in the part of the support plate 465 in the second movable groove 462 in the direction toward the pushing plate 44, so that the second movable groove 462 draws gas to the outside through the through hole 471, and at this time the film covers the top of the workbench 2 and blocks the through hole 471, so that the film is adsorbed above the workbench 2, because the support plate 465 inside the second movable groove 462 will draw air from the outside through the through hole 471 during the pushing process, so that the film is adsorbed above the placement table, as the support plate 465 is continuously pushed, the suction force generated inside the through hole 471 will also continue to act on the bottom of the film to prevent the film from being dislocated from the upper side of the workbench 2 and affecting the subsequent locking effect of the film.
[0044] like Figures 3 to 5 and Fig. 9 As shown, a flattening assembly 48 is provided on the outer side of the first connecting plate 41, and the flattening assembly 48 includes a second tension spring 481 fixedly connected to the opposite surfaces of the two first connecting plates 41, and the number of the second tension springs 481 is two, and the other ends of the two second tension springs 481 are respectively fixedly connected to the lower sides of the two pre-laid brackets 42, and the pre-laid brackets 42 are in a "T" shape.
[0045] By adopting the above technical solution, first, during the process of the first connecting plate 41 pulling the pre-laid bracket 42, the pre-laid bracket 42 continues to move following the first connecting plate 41, and at the same time, the second tension spring 481 fixed to the first connecting plate 41 will continue to pull the pre-laid bracket 42, so that the pre-laid support is always guaranteed to be tightly fitted on the top of the film, and the pre-laid support itself has a certain weight, so that the pre-laid bracket 42 always presses the film during the movement, and the pre-laid bracket 42 can be pushed upward. Since the pre-laid support moves with the first connecting plate 41 and continuously presses the film, it can not only press the film above the workbench 2, but also allow the film to be pre-laid before stretching to ensure the flatness of the film and make it easier to deform during the stretching process.
[0046] like Figure 5 and Fig. 9As shown, a preheating assembly 49 is provided on the outer side of the two pre-laid brackets 42, a delivery pipe 391 is fixedly installed on the upper side of the pre-laid bracket 42, and the other end of the delivery pipe 391 is connected to an external heating device. An exhaust hole 392 is opened on the lower side of the pre-laid bracket 42, and the number of the exhaust holes 392 is multiple.
[0047] By adopting the above technical solution, first, before the first connecting plate 41 pulls the pre-laid bracket 42, the conveying pipe 391 above the pre-laid bracket 42 is connected to the external heating equipment, so that the hot air provided by the external heating equipment is blown toward the film through the exhaust hole 392. As the pre-laid bracket 42 moves slowly, the hot air will also be blown slowly toward the film. During the process of flattening the film by the pre-laid bracket 42, the hot air generated through the exhaust hole 392 will also be blown toward the film, so that the film gradually softens after being heated, so as to ensure the stretching efficiency of the film by the workbench 2 and the structure above it.
[0048] like Figure 6 As shown, a material stripping component 5 is provided on the outer side of the workbench 2. The material stripping component 5 includes an extension plate 51 fixedly connected to the side away from the two pre-laid brackets 42. The number of the single-side extension plates 51 is two.
[0049] The lower sides of multiple extension plates 51 are fixedly connected with magnetic strips 52, and the upper side of the workbench 2 is clamped with a lifting plate 53, and the number of the lifting plates 53 is multiple. The lower sides of the multiple lifting plates 53 are fixedly connected with limiting rods 54, and the upper side of the workbench 2 is provided with limiting grooves 55, and the number of the limiting grooves 55 is multiple. The multiple limiting rods 54 are respectively slidably connected in the multiple limiting grooves 55, and are located on the upper sides of the two lifting plates 53 on the same side after the front and rear rotating seats 469 rotate. The lifting plates 53 are made of metal, and the extension plates 51 are above the lifting plates 53. After the magnetic strip 52 moves to the top of the lifting plate 53, it adsorbs the lifting plate 53. After the lifting plate 53 and the magnetic strip 52 are adsorbed, they move upward together with the limiting rods 54 and push the rotating seat 469 upward.
[0050] By adopting the above technical solution, first, when the two pre-laid brackets 42 are completely close to each other, the magnetic strip 52 under the extension plate 51 will reach above the lifting plate 53. Since the lifting plate 53 is made of metal, the magnetic strip 52 will adsorb the lifting plate 53 and cause the lifting plate 53 and the bottom thereof to move upward, and the limit rod 54 slides in the limit groove 55 and limits the rising height of the limit rod 54, so that the limit rod 54 cannot completely leave the workbench 2. During the upward lifting of the lifting plate 53, the two lifting plates 53 on the same side will push the bottom of the same rotating seat 469 to make it start to rotate, and the rotating seat 469 After rotation, the pre-laid bracket 42 and the second magnetic block 4693 on the outside of the rotating seat 469 will produce an adsorption effect, and at the same time, multiple lifting plates 53 can lift up the edge of the film. At this time, the stretched film can be taken out from above the workbench 2. Since the two pre-laid brackets 42 can absorb multiple lifting plates 53 during the process of stretching and merging the film, the lifting plates 53 can lift the edge of the film to prevent the film that is in contact with the workbench 2 from being difficult to pick up after being stretched. At the same time, during the rising process of the lifting plates 53, the rotating seat 469 can release the lock on the film, thereby saving the stretching time of subsequent batches of films.
[0051] like Figure 5 and Figure 7 As shown, a blowing assembly 56 is provided inside and outside the workbench 2. The blowing assembly 56 includes a blowing pipe 561 fixedly installed inside the workbench 2, and the number of the blowing pipes 561 is two. A sealing plate 562 is fixedly connected to one side of the lifting plate 53 close to the first connecting plate 41. One end of the blowing pipe 561 close to the workbench 2 is in extrusion contact with the lower side of the sealing plate 562, and the other end of the blowing pipe 561 is connected to an external air supply device.
[0052] By adopting the above technical solution, first, during the lifting process of the lifting plate 53, the sealing plate 562 fixed to the lifting plate 53 will also be lifted together. At this time, the output end of the blowing pipe 561 is exposed under the film, and the other end of the blowing pipe 561 is connected to an external air supply device, and the gas generated by it will be blown to the bottom of the film at this time, so that the air flow gradually blows to the center under the film, and finally the film is lifted. Since the sealing plate 562 is lifted together during the rising process of the lifting plate 53, the blowing pipe 561 will blow the gas to the bottom of the film after losing the sealing of the sealing plate 562, so that the film gradually bulges, and it is more convenient to take the film out from above the workbench 2.
[0053] Working principle: first, push aside the pre-laid bracket 42, and place the film on the workbench 2 inside the operating box 1, then place the edge of the film on top of multiple positioning seats 468, and then start the screw drive 3 to drive the first connecting plate 41 and the pre-laid bracket 42 hinged thereto to start moving toward the positioning seats 468 and the rotating seats 469 on the left and right sides. During this process, the two first connecting plates 41 respectively drive the two push plates 44 to move inside the workbench 2 and contact with the corresponding trapezoidal plates 45. The support plate 465 will move inside the second moving groove 462. The support plate 465 has only the through hole 471 as a vent in the direction of the push plate 44. After the support plate 465 moves, the external air pressure is greater than the air pressure of the part of the support plate 465 in the direction of the push plate 44 in the second moving groove 462, so that the second moving groove 462 passes through the through hole 471 extracts gas outward, and at this time the film covers the top of the workbench 2 and blocks the through hole 471, so that the film is adsorbed on the top of the workbench 2. In the process of the first connecting plate 41 pulling the pre-laid bracket 42, the pre-laid bracket 42 continues to move following the first connecting plate 41. At the same time, the second tension spring 481 fixed to the first connecting plate 41 will continue to pull the pre-laid bracket 42, so that the pre-laid support is always guaranteed to be tightly fitted with the top of the film, and the pre-laid support itself has a certain weight, so that the pre-laid bracket 42 always presses the film during the movement, and the pre-laid bracket 42 can be pushed upward. At the same time, the conveying pipe 391 above the pre-laid bracket 42 is connected to the external heating equipment, and blows the hot air to the film through the exhaust hole 392. As the pre-laid bracket 42 moves slowly, the hot air will also slowly blow to the film;
[0054] After the pre-laying bracket 42 moves, the second magnetic blocks 4693 on both sides thereof will move away from the second magnetic blocks 4693 on the surfaces of the two rotating seats 469 on the front and rear sides, and the first magnetic block 4692 on the other side of the rotating seat 469 will turn the rotating seat 469 to the other side by its own weight, and finally the first magnetic block 4692 will be adsorbed by the plurality of positioning seats 468, and the film will also be clamped between the rotating seat 469 and the positioning seat 468, and the film will be bent by ninety degrees. Before the pre-laying bracket 42 contacts the rotating seats 469 and the positioning seats 468 on the left and right sides, the racks 43 on the side of the pre-laying bracket 42 will be in contact with the front and rear of the rotating seats 469 on the left and right sides. The two gears 4691 on both sides are meshed, so that the rotating seat 469 starts to rotate, so that the film will be clamped between the rotating seat 469 and the positioning seat 468 again, and the film will be bent ninety degrees, and then the positioning seat 468 and the rotating seat 469 will be pulled, and the film will be bidirectionally stretched at the same time. After the two first connecting plates 41 start to get close, the gear 4691 will rotate in the opposite direction, so that the lock between the rotating seat 469 and the film is released. At the same time, the first tension spring 463 in the first moving groove 461 and the pressure spring 464 in the second moving groove 462 will quickly pull the second connecting plate 466 and gradually reset;
[0055] When the two pre-laid brackets 42 are completely close, the magnetic strip 52 under the extension plate 51 will reach the top of the lifting plate 53. Since the lifting plate 53 is made of metal, the magnetic strip 52 will adsorb the lifting plate 53 and cause the lifting plate 53 and the bottom thereof to move upward, and the limit rod 54 slides in the limit groove 55 and limits the rising height of the limit rod 54. At the same time, the two lifting plates 53 will push the bottom of the same rotating seat 469 to make it start to rotate. After the rotating seat 469 rotates, the pre-laid bracket 42 and the rotating seat 469 are rotated. The second magnetic block 4693 on the outside of the seat 469 will produce an adsorption effect, and at the same time, multiple lifting plates 53 can lift up the edge of the film. At this time, the stretched film can be taken out from above the workbench 2, because the sealing plate 562 fixed to the lifting plate 53 will also be lifted up together. At this time, the output end of the blowing pipe 561 is exposed under the film, and the other end of the blowing pipe 561 is connected to an external air supply device, and the gas generated by it will be blown to the bottom of the film at this time, so that the airflow gradually blows to the center under the film, and finally the film is lifted.
[0056] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A biaxial stretching device for processing polypropylene film, comprising an operating box (1) and a workbench (2) slidably connected to the operating box (1), wherein a screw drive (3) is arranged inside the workbench (2), and the screw drive (3) is composed of a double-axis motor, a screw, a screw nut and a guide rod, wherein the double-axis motor is fixedly installed inside the workbench (2), the screw is installed at the output end of the double-axis motor, the screw nut is movably installed on the outside of the screw, and the guide rod is fixedly installed on both sides of the workbench (2), characterized in that: A locking component (4) is provided on the outer side of the workbench (2); The locking component (4) comprises two first connecting plates (41) sleeved on the outer side of the screw nut, the two first connecting plates (41) are respectively slidably connected to the outer sides of the two guide rods, the upper sides of the two first connecting plates (41) are hinged with pre-laid brackets (42), the two pre-laid brackets (42) are slidably connected to the upper side of the workbench (2), the front and rear ends of the two pre-laid brackets (42) away from each other are fixedly connected with two racks (43), the opposite surfaces of the two first connecting plates (41) are fixedly connected with a push plate (44), the rear end of the upper push plate (44) and the front end of the lower push plate (44) are both provided with inclined surfaces, the upper push plate (44) is in sliding contact with the lower push plate (44), and the inclined surfaces of the two push plates (44) are both pressed and contacted with a trapezoidal plate (45).
2. The biaxial stretching device for polypropylene film processing according to claim 1, characterized in that: A bidirectional stretching component (46) is provided inside the workbench (2), and the bidirectional stretching component (46) includes first movable grooves (461) opened on the left and right sides of the workbench (2), and the number of the first movable grooves (461) on one side is multiple. A second movable groove (462) is opened inside the workbench (2), and the number of the second movable grooves (462) is two, and the two second movable grooves (462) are staggered. The first tension spring (463) is fixedly connected to the side of the multiple first movable grooves (461) away from the first connecting plate (41), and the pressure spring (464) is fixedly connected to the side of the two second movable grooves (462) away from each other, and the number of the pressure springs (464) is multiple.
3. The biaxial stretching device for polypropylene film processing according to claim 2, characterized in that: The insides of the plurality of first movable grooves (461) and the two second movable grooves (462) are slidably connected with second connecting plates (466); the plurality of second connecting plates (466) located on the front and rear sides are respectively slidably connected in the two second movable grooves (462); the plurality of second connecting plates (466) located on the left and right sides are respectively slidably connected in the plurality of first movable grooves (461); the other end of the first tension spring (463) is fixedly connected to a side of the second connecting plate (466) in the first movable groove (461) close to the workbench (2); the two second movable grooves (462) are slidably connected with a supporting plate (465); the other ends of the plurality of pressure springs (464) are fixedly connected to a side of the supporting plate (465) away from the trapezoidal plate (45); and the other side of the supporting plate (465) is in sliding contact with a side of the trapezoidal plate (45) close to the supporting plate (465).
4. The biaxial stretching device for polypropylene film processing according to claim 3, characterized in that: The second connecting plates (466) are hingedly connected to a hinge seat (467) on one side away from the workbench (2); the upper sides of the hinge seats (467) are rotatably connected to a positioning seat (468); the outer sides of the positioning seats (468) on one side are hingedly connected to a rotating seat (469); the front and rear sides of the two rotating seats (469) on the left sides are fixedly connected to gears (4691); the sides of the two rotating seats (469) on the front and rear sides are fixedly connected to a first magnetic block (4692); the positioning seat (468) and the pre-laid bracket (42) are both made of metal; after the two rotating seats (469) on the front and rear sides are rotated, they are erected above the multiple positioning seats (468) on the same side and connected to the first magnetic block (4692) through the first magnetic block (4692). The corresponding multiple positioning seats (468) are magnetically adsorbed, and the two pre-laid brackets (42) and the opposite surfaces of the two rotating seats (469) located at the front and rear are fixedly connected with second magnetic blocks (4693). The number of second magnetic blocks (4693) arranged on one side of the opposite surfaces of the two rotating seats (469) at the front and rear is two, and the opposite surfaces of the corresponding two second magnetic blocks (4693) are magnetically adsorbed. After the two pre-laid brackets (42) move to both sides, they push the multiple positioning seats (468) and the rotating seat (469) located on the left and right sides respectively. After the two racks (43) move through the pre-laid brackets (42), they are meshed with the gear (4691). After the gear (4691) is meshed with the rack (43), it drives the rotating seat (469) to rotate.
5. The biaxial stretching device for polypropylene film processing according to claim 3, characterized in that: An adsorption assembly (47) is provided on the upper side of the workbench (2), and the adsorption assembly (47) includes a through hole (471) starting from the upper side of the workbench (2). There are multiple through holes (471), and the multiple through holes (471) are respectively connected to the two second movable grooves (462).
6. The biaxial stretching device for polypropylene film processing according to claim 1, characterized in that: A flattening assembly (48) is provided on the outer side of the first connecting plate (41), and the flattening assembly (48) comprises a second tension spring (481) fixedly connected to the opposite surfaces of the two first connecting plates (41), and the number of the second tension springs (481) is two, and the other ends of the two second tension springs (481) are respectively fixedly connected to the lower sides of the two pre-laid brackets (42), and the pre-laid brackets (42) are in a "T" shape.
7. The biaxial stretching device for polypropylene film processing according to claim 1, characterized in that: A preheating assembly (49) is provided on the outer side of each of the two pre-laid brackets (42); a delivery pipe (491) is fixedly installed on the upper side of the pre-laid bracket (42); the other end of the delivery pipe (491) is connected to an external heating device; an exhaust hole (492) is provided on the lower side of the pre-laid bracket (42), and the number of the exhaust holes (492) is multiple.
8. The biaxial stretching device for polypropylene film processing according to claim 4, characterized in that: A material-removing component (5) is provided on the outer side of the workbench (2), and the material-removing component (5) comprises an extension plate (51) fixedly connected to a side away from two pre-laid brackets (42), and the number of the extension plates (51) on a single side is two.
9. The biaxial stretching device for polypropylene film processing according to claim 8, characterized in that: The lower sides of the plurality of extension plates (51) are all fixedly connected with magnetic strips (52); the upper side of the workbench (2) is clamped with a lifting plate (53), and the number of the lifting plates (53) is multiple; the lower sides of the plurality of lifting plates (53) are all fixedly connected with limiting rods (54); the upper side of the workbench (2) is provided with limiting grooves (55), and the number of the limiting grooves (55) is multiple; the plurality of limiting rods (54) are respectively slidably connected to the plurality of limiting grooves (55). The two rotating seats (469) located at the front and rear are mounted on the upper side of the two lifting plates (53) on the same side after they rotate, the lifting plates (53) are made of metal, the extension plate (51) is located above the lifting plates (53), the magnetic strip (52) moves to the top of the lifting plates (53) and absorbs the lifting plates (53), and the lifting plates (53) and the magnetic strip (52) are absorbed and move upward together with the limit rod (54) and push the rotating seat (469) upward.
10. The biaxial stretching device for polypropylene film processing according to claim 9, characterized in that: The inside and outside of the workbench (2) are provided with a blowing assembly (56), the blowing assembly (56) comprising a blowing pipe (561) fixedly installed inside the workbench (2), and the number of the blowing pipes (561) is two, a sealing plate (562) is fixedly connected to one side of the lifting plate (53) close to the first connecting plate (41), one end of the blowing pipe (561) close to the workbench (2) is in extrusion contact with the lower side of the sealing plate (562), and the other end of the blowing pipe (561) is connected to an external air supply device.