PLA biodegradable sheet extrusion production line

Abstract

The application relates to a PLA biodegradable sheet extrusion production line and relates to the technical field of biodegradable sheets; the production line comprises an extruder, a forming die, a three-roller calender, a cooling bracket and a winding machine which are sequentially arranged, the winding machine comprises a supporting frame, a supporting rod, a driving motor and a winding piece, the supporting rod is arranged on the supporting frame, the driving motor is arranged on the side wall of the supporting frame, the output end of the driving motor is connected to the supporting rod, the winding piece is arranged on the supporting rod, both ends of the supporting frame are provided with clamping rods, the side, where the two clamping rods are close to each other, of each clamping rod is provided with a positioning rod, a butt rod is arranged between the two clamping rods, both ends of the butt rod are provided with moving blocks, the side, where the two clamping rods are close to each other, of each clamping rod is provided with a moving groove for sliding of the corresponding moving block in the vertical direction, and one of the clamping rods is provided with a locking piece for fixing the butt rod; the application has the effect of reducing the sheet waste rate.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of biodegradable sheet materials, in particular to a PLA biodegradable sheet material extrusion production line. BACKGROUND

[0002] Biodegradable plastics refer to a kind of plastics that are degraded by microorganisms such as bacteria, molds (fungi) and algae existing in nature. An ideal biodegradable plastic is a kind of polymer material that has excellent use performance, can be completely decomposed by environmental microorganisms after being discarded, and is ultimately inorganic to become a part of the carbon cycle in nature.

[0003] In the production process of the sheet material, the plastic is melted by the extruder and then injected into the mold for forming, and then cooled. After cooling, the sheet material is wound up. When the winding roller on the winding machine reaches the maximum winding degree, the sheet material needs to be cut to replace the new winding roller. When the staff cuts the sheet material, the sheet material is in a suspended and loose state, and the cutting process is prone to cause uneven cutting, which increases the waste rate of the sheet material. Therefore, improvement is needed. SUMMARY

[0004] In order to reduce the waste rate of the sheet material, the application provides a PLA biodegradable sheet material extrusion production line.

[0005] The PLA biodegradable sheet material extrusion production line provided by the application adopts the following technical scheme:

[0006] The PLA biodegradable sheet material extrusion production line comprises an extruder, a forming mold, a three-roller calender, a cooling bracket and a winding machine arranged in sequence. The winding machine comprises a support frame, a support rod, a driving motor and a winding piece. The support rod is arranged on the support frame. The driving motor is arranged on the side wall of the support frame. The output end of the driving motor is connected to the support rod. The winding piece is arranged on the support rod. Both ends of the support frame are provided with clamping rods. The side of each clamping rod close to the other clamping rod is provided with a positioning rod. A butt rod is arranged between the two clamping rods. Both ends of the butt rod are provided with moving blocks. The side of each clamping rod close to the other clamping rod is provided with a moving groove for the corresponding moving block to slide in the vertical direction. One of the clamping rods is provided with a locking piece for fixing the butt rod.

[0007] By adopting the above technical scheme, when the winding piece winds the sheet material to the maximum degree, the butt rod is fixed by the locking piece. At this time, the sheet material is tensioned by the butt rod and the positioning rod. Therefore, when the staff cuts the sheet material, the sheet material is in a tensioned state, which improves the flatness of the cutting part of the sheet material and reduces the waste rate of the sheet material.

[0008] Preferably, the locking member comprises a screw rod, a rotating rod, a locking ring, and a locking rod, the screw rod is rotatably connected to the inner wall of the moving groove, the moving block is threadedly sleeved on the screw rod, the end of the rotating rod is connected to the screw rod through the side wall of the clamping rod, the locking ring is fixedly sleeved on the rotating rod, the side wall of the locking ring is provided with a locking hole through which the end of the locking rod passes, and the clamping rod is provided with a positioning groove in which the end of the locking rod is inserted.

[0009] By adopting the above technical scheme, the rotating rod is rotated to drive the screw rod to rotate, the screw rod drives the sliding block connected thereto to move along the vertical direction of the inner wall of the sliding groove until the sheet is abutted between the clamping rod and the positioning rod, then the end of the locking rod is inserted into the inner wall of the positioning groove through the locking hole, and the screw rod is fixed by fixing the locking ring, thereby improving the stability of the sheet between the clamping rod and the positioning rod.

[0010] Preferably, the side wall of the locking rod is provided with a spiral rod, and the inner wall of the positioning groove is provided with a spiral groove in which the spiral rod is threadedly embedded.

[0011] By adopting the above technical scheme, after the spiral rod is threadedly embedded in the inner wall of the thread groove, the stability of the end of the locking rod inserted into the inner wall of the positioning groove is further improved, thereby further improving the stability of the sheet between the clamping rod and the positioning rod.

[0012] Preferably, the side of the abutting rod close to the positioning rod is provided with a flexible pad.

[0013] By adopting the above technical scheme, the flexible pad is provided to protect the sheet and reduce the pressure marks generated on the surface of the sheet when the abutting rod is abutted against the surface of the sheet.

[0014] Preferably, the upper surface of the abutting rod is slidably connected with a sliding frame, the inner wall of the sliding frame is provided with sliding blocks on both sides, the abutting rod is provided with sliding grooves on both sides for the sliding blocks to slide in the horizontal direction, the sliding frame is slidably connected with a scraping rod inside, the scraping rod comprises a mounting rod and a scraper provided at the end of the mounting rod, the side wall of the sliding frame is provided with an accommodating hole through which the scraping rod slides in the vertical direction, the side wall of the mounting rod is provided with a limiting ring, the accommodating hole is provided with a limiting groove inside for the limiting ring to slide in the vertical direction, and the peripheral wall of the limiting ring is uniformly provided with a plurality of limiting springs, and one end of each limiting spring away from the limiting ring is arranged in the inner wall of the limiting groove.

[0015] By adopting the above technical scheme, when the winding piece winds the sheet material to the maximum extent, the sheet material is compressed by the abutting rod and the positioning rod, then the mounting rod is pressed, so that the mounting rod slides along the vertical direction of the inner wall of the containing hole, at this time the limiting spring is compressed, and the limiting frame slides along the horizontal direction of the side wall of the abutting rod, so that the sheet material is cut by the scraper, and then the staff does not need to hold the blade to cut the sheet material, on the one hand, the possibility of being scratched by the staff is reduced, on the other hand, the possibility of losing the blade is reduced.

[0016] Preferably, the inner walls of the two sliding grooves are provided with magnetic members magnetically attracted to the corresponding sliding blocks.

[0017] By adopting the above technical scheme, when the sheet material does not need to be cut, the sliding frame is moved, so that the sliding blocks on the side wall of the sliding frame and the magnetic members are magnetically attracted, thereby improving the stability of the sliding frame on the abutting rod.

[0018] Preferably, the winding pieces are uniformly arranged on the peripheral wall of the supporting rod, each of the winding pieces comprises two mounting blocks, a winding motor, a butt joint rod, a winding rod, a connecting piece, and two fixing pieces, the two mounting blocks are symmetrically arranged on the supporting rod, the winding motor is arranged on the side wall of one of the mounting blocks, the output end of the winding motor is connected to the butt joint rod, the connecting piece is used for fixing the butt joint rod and the winding rod, the side of the two mounting blocks away from the supporting rod is provided with a placing groove for inserting the winding rod, and the two fixing pieces are respectively used for fixing the end of the winding rod to the inner wall of the corresponding placing groove.

[0019] By adopting the above technical scheme, the side wall of the supporting rod is provided with a plurality of winding pieces, when one of the winding pieces winds the sheet material to the maximum extent, the driving motor is started, the driving motor drives the supporting rod to rotate, so that the winding piece which does not wind the sheet material continues to wind the sheet material, so as to wind the sheet material while the winding piece which winds the sheet material is disassembled, thereby effectively improving the winding efficiency of the winding machine.

[0020] Preferably, the connecting piece comprises a connecting rod, a connecting spring, and a stabilizing rod, the butt joint rod is provided with a butt joint groove for sliding of the connecting rod at the end away from the winding motor, the mounting block is internally provided with a giving slot for sliding of the connecting rod, one end of the connecting spring is arranged at the end of the connecting rod away from the winding rod, the other end of the connecting spring is arranged on the inner wall of the butt joint groove, the stabilizing rod is arranged on the side wall of the connecting rod, and the side wall of the mounting block is circumferentially provided with a stabilizing groove for rotation of the stabilizing rod.

[0021] By adopting the above technical scheme, when the winding rod is placed in the placement slot, the connecting rod slides along the horizontal direction of the inner wall of the butt joint slot and the accommodation slot under the action of the connecting spring until the end of the connecting rod is inserted into the inner wall of the insertion slot, so that the winding motor drives the winding rod to rotate through the butt joint rod to realize the winding of the sheet material.

[0022] As a preferred, the fixing piece comprises a shielding plate, a dovetail block, a fixing rod and a fixing spring, the shielding plate is arranged on the mounting block for shielding the inner wall of the insertion slot, the dovetail block is arranged on the side wall of the shielding plate, the side wall of the two mounting blocks is provided with a dovetail groove corresponding to the sliding of the dovetail block, the inside of the two mounting blocks is provided with a fixing groove for the sliding of the fixing rod, one end of the fixing spring is arranged on the side wall of the fixing rod, the other end of the fixing spring is arranged on the inner wall of the fixing groove, and the side wall of the dovetail block is provided with a clamping groove for the insertion of the end of the fixing rod.

[0023] By adopting the above technical scheme, when the end of the winding rod is placed in the inner wall of the corresponding placement slot, the dovetail block on one side of the shielding plate is slid along the horizontal direction of the inner wall of the dovetail groove until the shielding plate shields the inner wall of the placement slot, at this time, the end of the fixing rod slides along the inner wall of the fixing groove under the action of the elastic force of the fixing spring until the end of the fixing rod is inserted into the inner wall of the clamping groove, so as to fix the dovetail block in the dovetail groove, and then fix the winding rod in the inner wall of the placement slot.

[0024] As a preferred, the side wall of the stabilizing rod is provided with a stabilizing ring, the side wall of the shielding plate close to the stabilizing rod is provided with a communication rod, the peripheral wall of the stabilizing ring is provided with a ring groove along the circumferential direction for the insertion of the communication rod, and the side wall of the mounting block is provided with a communication groove for the sliding of the communication rod in the horizontal direction.

[0025] By adopting the above technical scheme, when the shielding plate slides along the mounting block, the shielding plate drives the stabilizing ring to slide in the horizontal direction through the communication rod, the stabilizing ring synchronously drives the connecting rod to slide in the horizontal direction through the stabilizing rod, so that the end of the connecting rod is separated from the inner wall of the insertion slot, and then the staff can quickly and conveniently disassemble the winding rod of the wound sheet material from the mounting block.

[0026] In summary, the present application has at least one of the following beneficial technical effects:

[0027] 1. When the winding piece winds the sheet material to the maximum extent, the abutting rod is fixed by the locking piece, at this time, the sheet material is tensioned through the abutting rod and the positioning rod, so that when the staff cuts the sheet material, the sheet material is in a tensioned state, which improves the flatness of the cutting part of the sheet material and reduces the scrap rate of the sheet material.

[0028] 2. The side wall of the supporting rod is provided with a plurality of winding members, when one of the winding members winds the sheet material to the maximum, the driving motor is started to drive the supporting rod to rotate, so that the winding member which does not wind the sheet material continues to wind the sheet material, so as to detach the winding rod which winds the sheet material while winding the sheet material, and the winding efficiency of the winding machine is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic diagram of the overall structure of a PLA biodegradable sheet extrusion production line in the embodiment of the present application.

[0030] Figure 2 is a schematic diagram of the overall structure of the winding machine in the embodiment of the present application.

[0031] Figure 3 is a sectional view of the winding member structure in the embodiment of the present application.

[0032] Figure 4 is a sectional view of the fixing member structure in the embodiment of the present application.

[0033] Figure 5 is a sectional view of the locking member structure in the embodiment of the present application.

[0034] Figure 6 is Figure 5 is a local enlarged view of structure A in FIG. 6.

[0035] Figure 7 is a sectional view of the scraping rod structure in the embodiment of the present application.

[0036] BRIEF DESCRIPTION OF DRAWINGS

[0037] 1, extruder; 11, forming die; 12, three-roller calender; 13, cooling bracket; 2, winding machine; 21, support frame; 22, support rod; 23, driving motor; 24, winding piece; 241, mounting block; 2411, placing groove; 2412, let-out groove; 2413, stabilizing groove; 2414, dovetail groove; 2415, fixing groove; 242, winding motor; 243, butt joint rod; 2431, butt joint groove; 244, winding rod; 2441, insertion groove; 3, clamping rod; 31, positioning rod; 32, abutting rod; 321, moving block; 322, flexible pad; 323, sliding groove; 33, moving groove; 34, positioning groove; 341, helical groove; 4, locking piece; 41, screw rod; 42, rotating rod; 43, locking ring; 431, locking hole; 44, locking rod; 441, helical rod; 5, sliding frame; 51, sliding block; 511, magnetic piece; 52, containing hole; 521, limiting groove; 6, scraping rod; 61, mounting rod; 611, limiting ring; 6111, limiting spring; 62, scraper; 7, connecting piece; 71, connecting rod; 72, connecting spring; 73, stabilizing rod; 8, fixing piece; 81, shielding plate; 82, dovetail block; 821, clamping groove; 83, fixing rod; 84, fixing spring; 9, stabilizing ring; 91, communicating rod; 92, ring groove; 93, connecting groove. DETAILED DESCRIPTION

[0038] The following will be described in detail with reference to the accompanying drawings. Figures 1-7 The application is further described in detail.

[0039] The embodiment of the application discloses a PLA biodegradable sheet extrusion production line. Figure 1 The sheet extrusion production line comprises, in sequence along a horizontal direction, an extruder 1, a forming die 11, a three-roller calender 12, a cooling bracket 13 and a winding machine 2.

[0040] The following will be described in detail with reference to the accompanying drawings. Figure 2The winding machine 2 comprises a support frame 21, a support rod 22, a driving motor 23 and a plurality of winding members 24. The support rod 22 is rotationally connected to the support frame 21. The driving motor 23 is boltedly connected to a side wall of the support frame 21. An output end of the driving motor 23 is connected to the support rod 22. The plurality of winding members 24 are arranged on the support rod 22. In the embodiment, the support rod 22 is square in cross section. The plurality of winding members 24 are four in number. The four winding members 24 are evenly arranged on the side wall of the support rod 22. When one of the winding members 24 reaches the maximum winding capacity, the driving motor 23 is started to drive the support rod 22 to rotate, so that another winding member 24 without winding the sheet is rotated to the winding position, thereby winding the sheet. While the winding member 24 without winding the sheet on the winding machine 2 is winding, the winding member 24 with winding the sheet can be disassembled, thereby effectively improving the working efficiency of the winding machine 2.

[0041] With reference to Figure 3 Each winding member 24 comprises two mounting blocks 241, a winding motor 242, a butt joint rod 243, a winding rod 244, a connecting member 7 and two fixing members 8. The two mounting blocks 241 are symmetrically arranged on the side wall of the support rod 22. The winding motor 242 is boltedly connected to the side wall of one of the mounting blocks 241. An output end of the winding motor 242 is connected to the butt joint rod 243. The butt joint rod 243 is rotationally connected to the inside of the mounting block 241 on which the winding motor 242 is arranged. The connecting member 7 is used to connect the butt joint rod 243 and the winding rod 244. The two mounting blocks 241 away from the support rod 22 are provided with placing grooves 2411 in the vertical direction for placing the end portions of the corresponding winding rods 244. The two fixing members 8 are arranged on the two mounting blocks 241, respectively, so as to fix the end portions of the winding rods 244 to the inner walls of the placing grooves 2411.

[0042] With reference to Figure 3The connecting piece 7 comprises a connecting rod 71, a connecting spring 72 and a stabilizing rod 73. The end of the docking rod 243 away from the winding motor 242 is provided with a docking groove 2431 in which the connecting rod 71 can slide in a horizontal direction. The inner portion of the mounting block 241 is provided with a clearance groove 2412 in which the connecting rod 71 can slide. The cross section of the connecting rod 71 is square, and the cross section of the docking groove 2431 is a square groove. The end of the winding rod 244 is provided with a plug groove 2441 in which the end of the connecting rod 71 can be inserted. The cross section of the plug groove 244 is a square groove. One end of the connecting spring 72 is welded to the end of the connecting rod 71 away from the winding rod 244, and the other end of the connecting spring 72 is welded to the inner wall of the docking groove 2431. The stabilizing rod 73 is welded to the side wall of the connecting rod 71. The side wall of the mounting block 241 is provided with a stabilizing groove 2413 in which the stabilizing rod 73 can rotate in a circumferential direction. The stabilizing groove 2413 is in communication with the docking groove 2431. When the winding rod 244 is placed on the inner wall of the clearance groove 2411, the end of the connecting rod 71 is inserted into the inner wall of the plug groove 2441 under the elastic force of the connecting spring 72, so that the winding motor 242 drives the winding rod 244 to rotate through the docking rod 243 and the connecting rod 71, thereby winding the sheet material.

[0043] With reference to Figure 4 The fixing piece 8 comprises a shielding plate 81, a dovetail block 82, a fixing rod 83 and a fixing spring 84. The shielding plate 81 is slidingly connected to the side of the mounting block 241 away from the supporting rod 22. The dovetail block 82 is welded to the side wall of the shielding plate 81. The side wall of the mounting block 241 is provided with a dovetail groove 2414 in which the dovetail block 82 can slide in a horizontal direction. The side wall of the mounting block 241 is provided with a fixing groove 2415 in which the fixing rod 83 can slide in a horizontal direction. The fixing rod 83 can be a C-shaped rod, and the fixing groove 2415 can be a C-shaped groove. One end of the fixing spring 84 is welded to the side wall of the fixing rod 83, and the other end of the fixing spring 84 is welded to the bottom wall of the fixing groove 2415. The side of the dovetail block 82 away from the shielding plate 81 is provided with a clamping groove 821 in which the end of the fixing rod 83 can be inserted.

[0044] With reference to Figure 3 and Figure 4 The side wall of the stabilizing rod 73 is welded with a stabilizing ring 9 which is embedded in the inner wall of the stabilizing groove 2413. The side wall of the shielding plate 81 close to the stabilizing rod 73 is welded with a communication rod 91 which can be an L-shaped rod. The side wall of the mounting block 241 is provided with a communication groove 93 in which the communication rod 91 can slide in a horizontal direction. The circumferential wall of the stabilizing ring 9 is provided with a ring groove 92 in which the end of the communication rod 91 can be inserted.

[0045] With reference to Figure 1When the winding rod 244 winds the sheet to the maximum extent; the staff presses the fixing rod 83, the fixing rod 83 slides along the inner wall of the fixing groove 2415, at this time the fixing spring 84 is compressed, so that the end of the fixing rod 83 is separated from the inner wall of the clamping groove 821; then slide the shielding plate 81 along the surface of the mounting block 241, the dovetail block 82 on one side of the shielding plate 81 slides along the inner wall of the dovetail groove 2414 in the horizontal direction, until the shielding plate 81 is separated from the shielding of the inner wall of the placing groove 2411; and the communication rod 91 connected with one of the shielding plates 81 drives the stabilizing rod 73 to slide along the inner wall of the stabilizing groove 2413 synchronously through the stabilizing ring 9, the stabilizing rod 73 drives the connecting rod 71 to slide along the inner wall of the butt joint groove 2431 and the inner wall of the let go groove 2412 synchronously, until the end of the connecting rod 71 is separated from the inner wall of the insertion groove 2441, at this time the connecting spring 72 is in a compressed state, so that the staff can quickly and conveniently separate the winding rod 244 from the inner wall of the placing groove 2411.

[0046] With reference to Figure 5 Both ends of the supporting rod 22 are welded with clamping rods 3, one side of the two clamping rods 3 close to each other is welded with a positioning rod 31, and an abutting rod 32 is arranged between the two clamping rods 3. The side of the abutting rod 32 close to the positioning rod 31 is glued with a flexible pad 322, and the flexible pad 322 can be made of rubber. Both ends of the abutting rod 32 are welded with moving blocks 321, and one side of the two clamping rods 3 close to each other is provided with a moving groove 33 for the corresponding moving block 321 to slide in the vertical direction. One of the clamping rods 3 is provided with a locking piece 4 for fixing the abutting rod 32.

[0047] With reference to Figure 5 And Figure 6 The locking piece 4 comprises a lead screw 41, a rotating rod 42, a locking ring 43 and a locking rod 44. The lead screw 41 is rotationally connected to the inner wall of the moving groove 33, and the moving block 321 is threadedly sleeved on the lead screw 41. The end of the rotating rod 42 penetrates through the side wall of the clamping rod 3 and is integrally formed with the lead screw 41. The locking ring 43 is welded and sleeved on the rotating rod 42, and the side wall of the locking ring 43 is penetrated to form a locking hole 431 for the end of the locking rod 44 to penetrate through. The clamping rod 3 is provided with a positioning groove 34 for the end of the locking rod 44 to be inserted. The side wall of the locking rod 44 is integrally formed with a spiral rod 441, and the inner wall of the positioning groove 34 is provided with a spiral groove 341 for the spiral rod 441 to be threadedly embedded.

[0048] With reference to Figure 5 And Figure 6When one of the winding members 24 winds the roll material to the maximum, the rotating rod 42 is rotated, the rotating rod 42 drives the screw rod 41 to rotate, the screw rod 41 drives the moving block 321 connected thereto to slide along the vertical direction of the inner wall of the moving groove 33, the moving block 321 drives the abutting rod 32 to slide synchronously, so that the flexible pad 322 on the abutting rod 32 abuts against one side of the sheet material close to each other. At this time, the sheet material is abutted by the abutting rod 32 and the positioning rod 31, so that when the sheet material is cut, the sheet material is in a tension state, the flatness of the cutting part of the sheet material is improved, and the waste rate of the sheet material is reduced.

[0049] With reference to Figure 7 The two sides of the abutting rod 32 are provided with sliding grooves 323 in the horizontal direction, the inner walls of the sliding grooves 323 are slidably connected with sliding blocks 51, the two sliding blocks 51 are integrally connected with a sliding frame 5, and the sliding frame 5 is slidably connected to the side wall of the abutting rod 32. The side wall of the sliding frame 5 is provided with a containing hole 52 in the vertical direction, the inner wall of the containing hole 52 is slidably connected with a scraping rod 6, the scraping rod 6 comprises a mounting rod 61 and a scraper 62, the scraper 62 is fixed to the end of the mounting rod 61 by glue, the side wall of the mounting rod 61 is welded with a limiting ring 611, the inner wall of the containing hole 52 is provided with a limiting groove 521 in the height direction for the limiting ring 611 to slide in the vertical direction, and the side of the limiting ring 611 close to the scraper 62 is uniformly welded with a plurality of limiting springs 6111. In the embodiment of the application, there are four limiting springs 6111, and one end of each limiting spring 6111 away from the limiting ring 611 is welded to the inner wall of the limiting groove 521.

[0050] With reference to Figure 7 When the sheet material is abutted by the abutting rod 32 and the positioning rod 31, the mounting rod 61 is pressed, the mounting rod 61 slides in the vertical direction on the inner wall of the containing hole 52, so that the scraper 62 is separated from the inner wall of the containing hole 52, at this time, the mounting rod 61 drives the limiting ring 611 to slide in the vertical direction along the inner wall of the limiting groove 521, and at this time, the limiting springs 6111 are compressed. Then the sliding frame 5 slides along the horizontal direction of the side wall of the abutting rod 32, at this time, the sliding blocks 51 slide along the inner wall of the sliding grooves 323 synchronously, when the sliding frame 5 slides in the horizontal direction, the scraper 62 cuts the sheet material, so that the staff does not need to hold the blade to cut the sheet material; the possibility of being scratched by the blade is reduced.

[0051] With reference to Figure 7 When the sheet material is cut, the mounting rod 61 is loosened, at this time, the limiting springs 6111 rebound, so that the scraper 62 is embedded in the inner wall of the containing hole 52, and the possibility of scratching the sheet material by the scraper 62 when the next winding member 24 winds the roll material is reduced.

[0052] With reference to Figure 7The inner wall of the two sliding grooves 323 is adhered with a magnetic piece 511 by glue, the magnetic piece 511 can be a magnet, the magnetic piece 511 and the sliding block 51 are magnetically attracted, and the sliding block 51 can be an iron product; after the sheet cutting is completed, the sliding frame 5 is moved, so that the sliding block 51 and the magnetic piece 511 are magnetically attracted, thereby fixing the sliding frame 5, and the possibility that the sliding frame 5 affects the winding of the sheet is reduced.

[0053] The implementation principle of the PLA biodegradable sheet extrusion production line in the embodiment of the application is as follows: when the winding of the winding piece 24 on the winding material reaches the maximum degree, the rotating rod 42 is rotated, the rotating rod 42 drives the screw rod 41 to rotate, the screw rod 41 drives the sliding block 51 connected thereto to move along the vertical direction inside the sliding groove 323, until the sheet abuts against the clamping rod 3 and the positioning rod 31; then the end of the locking rod 44 is inserted into the positioning groove 34 through the locking hole 431, thereby fixing the abutting rod 32; when the sheet is cut, the sheet that is not wound is fixed by the clamping rod 3 and the positioning rod 31, so that the sheet is in a tension state when the sheet is cut, the flatness of the cutting part of the sheet is effectively improved, and the waste rate of the sheet is reduced.

[0054] The above are preferred embodiments of the application, and do not limit the protection scope of the application, so: equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A PLA biodegradable sheet extrusion production line comprising an extruder (1), a forming die (11), a three-roller calender (12), a cooling bracket (13) and a winding machine (2) arranged in sequence, characterized in that: The winding machine (2) comprises a support frame (21), a support rod (22), a driving motor (23) and a winding piece (24), the support rod (22) is arranged on the support frame (21), the driving motor (23) is arranged on the side wall of the support frame (21), the output end of the driving motor (23) is connected to the support rod (22), and the winding piece (24) is arranged on the support rod (22); both ends of the support frame (21) are provided with clamping rods (3), the side of the two clamping rods (3) close to each other is provided with a positioning rod (31), and the abutting rod (32) is arranged between the two clamping rods (3); the two ends of the abutting rod (32) are provided with a moving block (321), the side of the two clamping rods (3) close to each other is provided with a moving slot (33) for the corresponding moving block (321) to slide in the vertical direction, and the clamping rod (3) is provided with a locking piece (4) for fixing the abutting rod (32); The locking piece (4) comprises a screw rod (41), a rotating rod (42), a locking ring (43) and a locking rod (44), the screw rod (41) is rotatably connected to the inner wall of the moving slot (33), the moving block (321) is threadedly sleeved on the screw rod (41), the end of the rotating rod (42) penetrates through the side wall of the clamping rod (3) and is connected with the screw rod (41), the locking ring (43) is fixedly sleeved on the rotating rod (42), the side wall of the locking ring (43) is provided with a locking hole (431) for the end of the locking rod (44) to penetrate through, and the clamping rod (3) is provided with a positioning slot (34) for the end of the locking rod (44) to be inserted; The side wall of the locking rod (44) is provided with a spiral rod (441), and the inner wall of the positioning slot (34) is provided with a spiral groove (341) for the spiral rod (441) to be threadedly embedded; The upper surface of the abutting rod (32) is slidably connected with a sliding frame (5), the two sides of the inner wall of the sliding frame (5) are provided with sliding blocks (51), the two sides of the abutting rod (32) are provided with sliding grooves (323) for the corresponding sliding blocks (51) to slide in the horizontal direction, the sliding frame (5) is slidably connected with a scraping rod (6), the scraping rod (6) comprises an installation rod (61) and a scraper (62) arranged at the end of the installation rod (61), the side wall of the sliding frame (5) is provided with an accommodating hole (52) for the scraping rod (6) to slide in the vertical direction, the side wall of the installation rod (61) is provided with a limiting ring (611), the inner part of the accommodating hole (52) is provided with a limiting groove (521) for the limiting ring (611) to slide in the vertical direction, and the peripheral wall of the limiting ring (611) is uniformly provided with a plurality of limiting springs (6111), and the end of each limiting spring (6111) away from the limiting ring (611) is arranged on the inner wall of the limiting groove (521). The winding piece (24) is uniformly arranged along the peripheral wall of the supporting rod (22), each of the winding piece (24) comprises two mounting blocks (241), a winding motor (242), a butt joint rod (243), a winding rod (244), a connecting piece (7), two fixing pieces (8), the two mounting blocks (241) are symmetrically arranged on the supporting rod (22), the winding motor (242) is arranged on the side wall of one of the mounting blocks (241), the output end of the winding motor (242) is connected to the butt joint rod (243), the connecting piece (7) is used for fixing the butt joint rod (243) and the winding rod (244), the side, away from the supporting rod (22), of the two mounting blocks (241) is provided with a placing groove (2411) for inserting the winding rod (244), and the two fixing pieces (8) are respectively used for fixing the end of the winding rod (244) to the inner wall of the corresponding placing groove (2411). The fixing piece (8) comprises a shielding plate (81), a dovetail block (82), a fixing rod (83) and a fixing spring (84), the shielding plate (81) is arranged on the mounting block (241) and used for shielding the inner wall of the placing groove (2411), the dovetail block (82) is arranged on the side wall of the shielding plate (81), the side wall of the two mounting blocks (241) is provided with a dovetail groove (2414) corresponding to the sliding of the dovetail block (82), the inside of the two mounting blocks (241) is provided with a fixing groove (2415) for the sliding of the fixing rod (83), one end of the fixing spring (84) is arranged on the side wall of the fixing rod (83), the other end of the fixing spring (84) is arranged on the inner wall of the fixing groove (2415), and the side wall of the dovetail block (82) is provided with a clamping groove (821) for inserting the end of the fixing rod (83).

2. The PLA biodegradable sheet extrusion production line according to claim 1, characterized in that: The abutting rod (32) is provided with a flexible pad (322) on the side close to the positioning rod (31).

3. The PLA biodegradable sheet extrusion production line according to claim 1, characterized in that: The inner wall of the two sliding grooves (323) is provided with a magnetic piece (511) magnetically attracted to the corresponding sliding block (51).

4. The PLA biodegradable sheet extrusion production line according to claim 1, characterized in that: The connecting piece (7) comprises a connecting rod (71), a connecting spring (72) and a stabilizing rod (73), the end, away from the winding motor (242), of the butt joint rod (243) is provided with a butt joint groove (2431) for the sliding of the connecting rod (71) in the horizontal direction, the inside of the mounting block (241) is provided with a giving-way groove (2412) for the sliding of the connecting rod (71) in the horizontal direction, one end of the connecting spring (72) is arranged on the end, away from the winding rod (244), of the connecting rod (71), the other end of the connecting spring (72) is arranged on the inner wall of the butt joint groove (2431), and the stabilizing rod (73) is arranged on the side wall of the connecting rod (71). The side wall of the mounting block (241) is provided with a stabilizing groove (2413) for the rotation of the stabilizing rod (73) in the circumferential direction.

5. The PLA biodegradable sheet extrusion production line according to claim 4, characterized in that: The side wall of the stabilizing rod (73) is provided with a stabilizing ring (9) embedded in the inner wall of a stabilizing groove (2413), and the side wall of the shielding plate (81) close to the stabilizing rod (73) is provided with a communication rod (91), the peripheral wall of the stabilizing ring (9) is provided with a ring groove (92) for inserting the communication rod (91) in the circumferential direction, and the side wall of the mounting block (241) is provided with a connecting groove (93) for sliding the communication rod (91) in the horizontal direction.

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