Raw material melting device for preparing a biodegradable heat-shrinkable film

Abstract

The application belongs to the technical field of biodegradable heat-shrinkable film preparation, and particularly relates to a raw material melting device for biodegradable heat-shrinkable film preparation. The device comprises a heating tank, a melting tank and an extruder. The melting tank is arranged in the heating tank. A plurality of heating elements are arranged between the heating tank and the melting tank. A shaft roller one is rotatably arranged at the top of the melting tank. An outer wall of the shaft roller one is connected with a stirring element one. A shaft roller two with the same shaft as the shaft roller one is rotatably arranged at the bottom of the melting tank. An outer wall of the shaft roller two is connected with a stirring element two. The shaft roller two and the shaft roller one rotate in opposite directions. The shaft roller one and the shaft roller two rotate in opposite directions, so that the materials at the top and the bottom of the melting tank are continuously staggered, the uniformity of the dispersion of the materials in the horizontal and vertical directions is improved, and the uniformity of the heat-shrinkable film product quality after extrusion is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of biodegradable heat shrinkable film preparation technology, in particular to a raw material melting device for biodegradable heat shrinkable film preparation. BACKGROUND

[0002] Heat shrinkable film is used for the sale and transportation of various products, and its main function is to stabilize, cover and protect the products. Biodegradable heat shrinkable film is mainly made by selecting degradable materials in the raw materials and then melting and extruding to form a biodegradable film product.

[0003] The prior art usually puts multiple raw materials into a heating tank for melting during the preparation process, and disperses the mixed raw materials through a rotating stirring assembly. However, the stirring assembly is usually connected to a driving mechanism and rotates uniformly in a single direction for dispersion work. The materials in a molten state move in a lump, which can easily cause uneven dispersion of the degradable materials, thereby affecting the quality of the film product prepared by extrusion molding. SUMMARY

[0004] Based on the technical problems in the background, the present application provides a raw material melting device for biodegradable heat shrinkable film preparation.

[0005] The raw material melting device for biodegradable heat shrinkable film preparation provided by the present application comprises a heating tank, a melting tank and an extruder. The melting tank is arranged in the heating tank. A feeding channel is fixed to one side of the top of the heating tank and communicates with the top of the melting tank. A discharging channel is fixed to the bottom of the heating tank and communicates with the bottom of the melting tank. The bottom end of the discharging channel communicates with the extruder. A plurality of heating elements are arranged between the heating tank and the melting tank. A shaft roller one is rotatably arranged at the top position in the melting tank. A stirring element one is connected to the outer wall of the shaft roller one. A shaft roller two with the same shaft as the shaft roller one is rotatably arranged at the bottom position in the melting tank. A stirring element two is connected to the outer wall of the shaft roller two. The shaft roller two and the shaft roller one rotate in opposite directions.

[0006] Preferably, a bottom plate in sliding contact with the bottom of the melting tank is fixed to the top of the outer wall of the discharging channel. A top cover in contact with the top end of the melting tank is fixed to the top inner wall of the heating tank. A connecting cylinder extending upward is arranged at the middle position of the top cover. A fixed hole one rotatably connected to the outer wall of the shaft roller one is formed at the middle position of the top of the heating tank. A driving motor is fixed to one side of the top of the heating tank. A gear one is fixed to the output shaft of the driving motor. A gear two meshing with the gear one is fixed to the top of the outer wall of the shaft roller one.

[0007] Preferably, one side of the top of the top cover is provided with a fixing hole two, the inner wall of the fixing hole two is rotatably connected with the vertical downward extending shaft roller three through the bearing, the outer wall of the shaft roller three is fixed with the gear three at the corresponding position of the shaft roller one, the outer wall of the shaft roller one is fixed with the gear five engaged with the gear three at the bottom, and the outer wall of the shaft roller three is fixed with the gear four at the corresponding position of the shaft roller two.

[0008] Preferably, the inner wall of the melting tank is fixed with two limit strips of annular structure at the corresponding position of the stirring piece two, the stirring piece two is provided with a connecting ring plate, the top and bottom of the connecting ring plate are respectively in sliding contact with the two limit strips, the inner wall of the connecting ring plate is fixed with a ring-shaped array of tooth blocks at the top, the tooth blocks are engaged with the gear four, and the bottom of the inner wall of the connecting ring plate is fixed with a plurality of stirring bars two between the shaft roller two, the outer wall of the stirring bar two is fixed with two reverse inclined stirring blades.

[0009] Preferably, the stirring piece one is provided with a plurality of stirring bars one fixed with the outer wall of the shaft roller one, the length of the stirring bar one is less than the distance between the shaft roller three and the shaft roller one, the top of the stirring bar one is provided with a vertical hole away from the end of the shaft roller one, and the inner wall of the vertical hole is rotatably provided with a connecting ring through a torsional spring.

[0010] Preferably, the outer wall of the connecting ring is in contact with the outer wall of the shaft roller three, the inner wall of the connecting ring is fixed with a plurality of leaf plates, and a plurality of mesh holes are formed in the side wall of the leaf plate.

[0011] Preferably, the shaft center positions of the shaft roller one and the shaft roller two are provided with vertical through holes, the cross section of the through hole is a quadrilateral structure, a vertical extending shaft rod is placed at the shaft center position of the through hole, the outer wall of the shaft rod is fixed with a connecting piece at the position between the shaft roller one and the shaft roller two, the outer wall of the connecting piece is in sliding contact with the inner wall of the through hole, the length of the connecting piece is less than the distance between the shaft roller one and the shaft roller two, a plurality of stirring bars three are fixed on the outer wall of the connecting piece, and helical blades are fixed on the outer wall of the shaft rod at the corresponding position of the discharging channel.

[0012] Preferably, the top end of the outer wall of the shaft rod is rotatably connected with a lifting plate through a bearing, and the bottom of the lifting plate is fixedly connected with an electric push rod between the top of the heating tank; the top end and the bottom end of the connecting piece are both provided with a sliding part, the width of the sliding part is less than the width of the connecting piece, the outer wall of the sliding part is slidably connected with a movable piece, a through hole slidably connected with the shaft rod is formed in the middle position of the movable piece, a spring is connected between the end of the movable piece and the sliding part, and the outer wall of the movable piece is in sliding contact with the inner wall of the through hole.

[0013] Preferably, the lengths of the stirring bar one, the stirring bar three and the stirring bar two are sequentially increased.

[0014] Preferably, a plurality of fixing holes three are arranged on the inner wall of the melting tank corresponding to the position of the stirring bar three, the inner wall of the fixing hole three is fixed with a horizontally placed vent pipe, the vent pipe is in communication with the heating cavity, the outer wall of the vent pipe is rotatably connected with a sealingly arranged heat exchange shell in the melting tank, the end of the vent pipe away from the heating cavity is in communication with the heat exchange shell, and the stirring bar three is in contact with the outer wall of the heat exchange shell.

[0015] The beneficial effects in the application are:

[0016] In the embodiment of the application, the shaft roller two and the shaft roller one are reversely rotated, so that the stirring part one and the stirring part two are reversely rotated to improve the uniformity of the dispersion of the raw materials. While realizing the reverse rotation of the shaft roller one and the shaft roller two, the gear four at the static position and the rotating connecting ring plate are used to make the raw materials at the corresponding bottom position collide and disperse in the process of circumferential rotation. The gear three and the gear five at the top position are relatively rotated with the stirring part one to improve the dispersion effect of the raw materials at the top position. Therefore, the dispersion effect of the raw materials is further improved through the relative movement of each part, and the raw materials in the molten state are prevented from being bonded and moved in a pile.

[0017] In the embodiment of the application, the connecting ring is reciprocatingly deflected while rotating with the shaft roller one to improve the dispersion effect of the raw materials. While rotating and dispersing, the connecting ring is spaced from the shaft roller three to collide, so that the gear connecting position and the contact position of the stirring part produce mechanical vibration, thereby further improving the fineness of the dispersion of the raw materials, effectively dispersing the raw materials bonded in a pile, and ensuring the uniformity of the melting and extrusion.

[0018] In the embodiment of the application, the shaft rod is vertically reciprocatingly moved by the electric push rod, so that the shaft rod and the stirring bar three are reciprocatingly and reversely rotated, and the stirring bar one and the stirring bar two are reversely rotated to further improve the dispersion effect of the raw materials, thereby improving the uniformity of the melting and dispersion.

[0019] In the embodiment of the application, the hot gas in the heating cavity is introduced into the melting tank through the vent pipe and the heat exchange shell to improve the heat exchange efficiency. During the reciprocating and reverse rotation of the stirring bar three, the stirring bar three collides with the top and bottom positions of the heat exchange shell respectively, so that the heat exchange shell always rotates in one direction along the vent pipe to relatively move with the reverse rotating stirring bar three, thereby further improving the dispersion and interaction effect of the raw materials around the melting tank, and enhancing the uniformity of the melting and dispersion of the raw materials. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The application provides a raw material melting device for preparing a biodegradable heat-shrinkable film.

[0021] Figure 2A raw material melting device for preparing a biodegradable heat-shrinkable film is provided.

[0022] Figure 3 A raw material melting device for preparing a biodegradable heat-shrinkable film is provided.

[0023] Figure 4 A raw material melting device for preparing a biodegradable heat-shrinkable film is provided.

[0024] Figure 5 A raw material melting device for preparing a biodegradable heat-shrinkable film is provided.

[0025] Figure 6 A raw material melting device for preparing a biodegradable heat-shrinkable film is provided.

[0026] Figure 7 A raw material melting device for preparing a biodegradable heat-shrinkable film is provided.

[0027] Figure 8 A raw material melting device for preparing a biodegradable heat-shrinkable film is provided.

[0028] Figure 9 A raw material melting device for preparing a biodegradable heat-shrinkable film is provided.

[0029] Figure 10 A raw material melting device for preparing a biodegradable heat-shrinkable film is provided.

[0030] The figure: 1 heating tank, 101 cover plate, 2 feeding channel, 3 discharging channel, 4 extruder, 5 melting tank, 501 limiting strip, 6 bottom plate, 7 top cover, 8 heating cavity, 9 heating piece, 10 shaft roller one, 11 stirring piece one, 12 shaft roller two, 13 stirring piece two, 14 driving motor, 15 gear one, 16 gear two, 17 shaft roller three, 171 gear three, 172 gear four, 18 gear five, 19 connecting ring plate, 191 tooth block, 20 stirring strip two, 21 stirring blade, 22 stirring strip one, 23 connecting ring, 24 leaf plate, 25 perforation, 26 shaft rod, 27 helical blade, 28 lifting plate, 29 electric push rod, 30 connecting piece, 31 sliding part, 32 movable piece, 33 spring, 34 stirring strip three, 35 air pipe, 36 heat exchange shell. DETAILED DESCRIPTION

[0031] Example 1, refer toFigures 1-5 The application discloses a raw material melting device for preparing a biodegradable heat-shrinkable film, which comprises a heating tank 1, a melting tank 5 and an extruder 4, the melting tank 5 is arranged in the heating tank 1, one side of the top of the heating tank 1 is fixed with a feeding channel 2 in communication with the top of the melting tank 5, the bottom of the heating tank 1 is fixed with a discharging channel 3 in communication with the bottom of the melting tank 5, the bottom end of the discharging channel 3 is in communication with the extruder 4, a heating cavity 8 is formed between the heating tank 1 and the melting tank 5, a plurality of heating pieces 9 are arranged in the heating cavity 8, a shaft roller one 10 is rotatably arranged at the top position in the melting tank 5, an outer wall of the shaft roller one 10 is connected with a stirring piece one 11, a shaft roller two 12 with the same shaft as the shaft roller one 10 is rotatably arranged at the bottom position in the melting tank 5, an outer wall of the shaft roller two 12 is connected with a stirring piece two 13, the shaft roller two 12 and the shaft roller one 10 rotate in opposite directions, so that each raw material for preparing the biodegradable heat-shrinkable film is put into the melting tank 5 from the feeding channel 2, the top end of the feeding channel 2 is blocked, then the raw materials are melted by the cooperation of the heating pieces 9 between the heating tank 1 and the melting tank 5 and the rotating stirring piece one 11 and the stirring piece two 13, and the materials at the top and the bottom in the melting tank 5 are continuously staggered by the opposite rotating shaft roller one 10 and the shaft roller two 12, so that the uniformity of the materials in the horizontal and vertical directions is improved, and the uniformity of the heat-shrinkable film product quality after extrusion molding is improved.

[0032] In the application, with reference to Figures 1-5 A bottom plate 6 is fixed to the top of the outer wall of the discharging channel 3 and is in sliding contact with the bottom of the melting tank 5, and a discharging opening is formed in the bottom end of the melting tank 5 and is in communication with the discharging channel 3; a top cover 7 is fixed to the top inner wall of the heating tank 1 and is in contact with the top end of the melting tank 5, the heating pieces 9 are fixed to the top cover 7, a cover plate 101 is detachably connected to the position of the outer wall of the heating tank 1 corresponding to the heating pieces 9, the bottom end of the feeding channel 2 penetrates through the top cover 7, a connecting cylinder extending upward is arranged at the middle position of the top cover 7, the shaft roller one 10 is coaxially arranged with the connecting cylinder, a fixed hole one is formed in the top middle position of the heating tank 1 and is in rotating connection with the outer wall of the shaft roller one 10; a driving motor 14 is fixed to one side of the top of the heating tank 1, the output shaft of the driving motor 14 extends to one side position in the connecting cylinder, the output shaft of the driving motor 14 is fixed with a gear one 15, and the top of the outer wall of the shaft roller one 10 is fixed with a gear two 16 meshing with the gear one 15; the feeding channel 2 arranged at one side of the top of the heating tank 1 is used to put the raw materials, and the driving motor 14 with the output shaft extending is used to drive the shaft roller one 10 and the stirring piece one 11 to rotate.

[0033] In the application, with reference to Figures 1-5The top of the top cover 7 is provided with a fixing hole two, the inner wall of the fixing hole two is rotatably connected with a vertical downward extending shaft roller three 17 through a bearing, the outer wall of the shaft roller three 17 is fixed with a gear three 171 at a position corresponding to the shaft roller one 10, the bottom of the outer wall of the shaft roller one 10 is fixed with a gear five 18 engaged with the gear three 171, the outer wall of the shaft roller three 17 is fixed with a gear four 172 at a position corresponding to the shaft roller two 12, the inner wall of the melting tank 5 is fixed with two limit strips 501 of annular structure at a position corresponding to the stirring part two 13, the stirring part two 13 is provided with a connecting ring plate 19 in sliding contact with the inner wall of the melting tank 5, the top and bottom end of the connecting ring plate 19 are in sliding contact with the two limit strips 501 respectively; the inner wall of the connecting ring plate 19 is fixed with a ring-shaped array distributed gear block 191 at the top end, the gear block 191 is engaged with the gear four 172; a plurality of stirring strips two 20 are fixed between the inner wall of the connecting ring plate 19 and the shaft roller two 12, the outer wall of the stirring strip two 20 is fixed with two oppositely inclined stirring blades 21; in use, the driving motor 14 rotates with the shaft roller one 10, the shaft roller three 17 rotates reversely with the shaft roller one 10 through the engagement between the outer sides of the gear three 171 and the gear five 18; the connecting ring plate 19 rotates in the same direction with the shaft roller three 17 through the engagement between the gear four 172 and the gear block 191 on the inner side of the connecting ring plate 19, so that the shaft roller two 12 rotates reversely with the shaft roller one 10, so that the stirring part one 11 and the stirring part two 13 rotate reversely to improve the uniformity of the dispersion of the raw materials;

[0034] At the same time of realizing the reverse rotation of the shaft roller one 10 and the shaft roller two 12, the raw materials at the corresponding bottom position are collided and dispersed in the process of circumferential rotation through the stationary gear four 172 and the rotating connecting ring plate 19, and the bottom raw materials are moved upward and collided with the dispersed raw materials through the oppositely inclined stirring blades 21 below; the dispersion effect of the raw materials at the top position is improved through the relative rotation of the gear three 171 and the gear five 18 and the rotating stirring part one 11; so as to further improve the chopping and dispersion effect of the raw materials through the relative movement of each part, and avoid the raw materials from being bonded into a pile in the molten state.

[0035] In the application, refer to Figures 1-7The stirring piece 11 is provided with a plurality of stirring bars 22 fixed to the outer wall of the shaft roller 10. The length of the stirring bar 22 is less than the distance between the shaft roller 17 and the shaft roller 10. A vertical hole is formed at the end of the stirring bar 22 away from the shaft roller 10. A connecting ring 23 is rotatably arranged on the inner wall of the vertical hole by a torsion spring. The outer wall of the connecting ring 23 is in contact with the outer wall of the shaft roller 17. A plurality of leaf plates 24 are fixed to the inner wall of the connecting ring 23. A plurality of mesh holes are formed on the side wall of the leaf plate 24. In use, the stirring bar 22 rotates with the shaft roller 10 to perform dispersion work. The connecting rings 23 at the ends of the plurality of stirring bars 22 are spaced apart and impact on the outer wall of the shaft roller 17. The connecting ring 23 is deflected relative to the axis of the vertical hole until it is reset away from the shaft roller 17 under the action of the torsion spring. Thus, the connecting ring 23 rotates with the shaft roller 10 while reciprocating and deflecting to improve the dispersion effect of the raw materials. While rotating and dispersing, the connecting ring 23 is spaced apart and collides with the shaft roller 17, causing mechanical vibration at the gear connection position and the contact position of the stirring piece, thereby further improving the dispersion of the raw materials. The raw materials adhering together are effectively dispersed to ensure the uniformity of the melting and extrusion.

[0036] Example 2 includes all the structures and methods of Example 1, and refers to Figures 1-9The utility model provides a raw material melting device for biodegradable heat shrinkable film preparation, still includes, the shaft roller one 10 and the shaft roller two 12's axle position all are equipped with the vertical through hole 25 of perforating, the cross section of through hole 25 is quadrilateral structure, the axle position of through hole 25 is placed with the vertical extension axle rod 26, the outer wall of axle rod 26 is fixed with connecting piece 30 between the position of shaft roller one 10 and the shaft roller two 12, the outer wall of connecting piece 30 and the inner wall of through hole 25 sliding contact, the length of connecting piece 30 is less than the distance between shaft roller one 10 and the shaft roller two 12, the outer wall of connecting piece 30 is fixed with multiple stirring strip three 34, the outer wall of axle rod 26 is fixed with helical blade 27 in the position corresponding with discharge channel 3, the top of axle rod 26 outer wall is rotatably connected with lifting plate 28 through bearing, lifting plate 28 is located in the upper position of heating tank 1, and the bottom of lifting plate 28 is fixedly connected with electric push rod 29 between the top of heating tank 1, the top and bottom of connecting piece 30 are all set up sliding part 31, the width of sliding part 31 is less than the width of connecting piece 30, the outer wall of sliding part 31 is slidingly connected with movable element 32, the middle position of movable element 32 is equipped with the through hole of sliding connection with axle rod 26, and the spring 33 is connected between movable element 32 and the end of sliding part 31, and the outer wall of movable element 32 and the inner wall of through hole 25 sliding contact, when connecting piece 30 is between shaft roller one 10 and the shaft roller two 12, only when stirring strip three 34 and the raw material of rotation collide, axle rod 26 and connecting piece 30 deflect, when connecting piece 30 goes up along with axle rod 26, connecting piece 30 and the through hole 25 in shaft roller one 10 limit sliding, so that axle rod 26 rotates along with shaft roller one 10, when connecting piece 30 goes down along with axle rod 26 and limit sliding with shaft roller two 12, axle rod 26 rotates along with shaft roller two 12,

[0037] So in the melting process, the vertical reciprocating motion of axle rod 26 is realized by electric push rod 29, so that the reciprocating direction-changing rotation of axle rod 26 and stirring strip three 34 is realized, and the direction-changing dispersion effect of the raw material is further improved by cooperating with the reverse rotation of stirring strip one 22 and stirring strip two 20, so that the uniformity of melting and dispersion is improved.

[0038] Through the movable element 32 connected to the top and bottom of connecting piece 30 by spring 33, when connecting piece 30 moves upward or downward, movable element 32 first contacts the rotating shaft roller one 10 or shaft roller two 12, when the through hole 25 does not rotate to match the movable element 32, movable element 32 first squeezes spring 33 until the through hole 25 aligns with the movable element 32, so that the movable element 32 and the connecting piece 30 can continue to rise, to ensure the effectiveness of the connection and the effectiveness of the reciprocating direction-changing rotation of the connecting piece 30.

[0039] In the utility model, refer to Figures 1-9, the length of the stirring strip one 22, the stirring strip three 34 and the stirring strip two 20 is increased in turn, so that the raw materials driven by the stirring are dispersed in the centrifugal direction in a gradient, and the dispersion effect of the raw materials in the circumferential rotation process in the melting state in the vertical direction is further improved.

[0040] In the present application, with reference to Figures 1-10 , a plurality of fixing holes three are arranged on the inner wall of the melting tank 5 corresponding to the stirring strip three 34, the inner wall of the fixing hole three is fixed with a horizontally placed air pipe 35, the air pipe 35 is in communication with the heating cavity 8, the outer wall of the air pipe 35 is rotationally connected with a sealingly arranged heat exchange shell 36 in the melting tank 5, the end of the air pipe 35 away from the heating cavity 8 is in communication with the heat exchange shell 36, the stirring strip three 34 is in contact with the outer wall of the heat exchange shell 36, so that the hot gas in the heating cavity 8 is introduced into the melting tank 5 through the air pipe 35 and the heat exchange shell 36, so as to improve the heat exchange efficiency; and during the reciprocating and reversing rotation of the stirring strip three 34, the top and bottom positions of the heat exchange shell 36 are collided respectively, so that the heat exchange shell 36 always rotates along the air pipe 35 in one direction, so as to move relative to the stirring strip three 34 rotating in the reverse direction, so as to further improve the dispersion and interaction effect of the raw materials around the melting tank, so as to enhance the uniformity of the melting and dispersion of the raw materials.

[0041] The above is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A raw material melting device for preparing biodegradable heat shrink film, comprising a heating tank (1), a melting tank (5), and an extruder (4), wherein the melting tank (5) is disposed inside the heating tank (1), a feed channel (2) communicating with the top of the melting tank (5) is fixed on one side of the top of the heating tank (1), and a discharge channel (3) communicating with the bottom of the melting tank (5) is fixed at the bottom of the heating tank (1), the bottom end of the discharge channel (3) communicating with the extruder (4), and a plurality of heating elements (9) are configured between the heating tank (1) and the melting tank (5), characterized in that, A roller 1 (10) is rotatably mounted at the top of the melting tank (5), and a stirring element 1 (11) is connected to the outer wall of the roller 1 (10). A roller 2 (12) with the same axis as the roller 1 (10) is rotatably mounted at the bottom of the melting tank (5), and a stirring element 2 (13) is connected to the outer wall of the roller 2 (12). The roller 2 (12) rotates in the opposite direction to the roller 1 (10). A top cover (7) is fixed to the top of the inner wall of the heating tank (1) and contacts the top of the melting tank (5). A drive motor (14) is fixed to one side of the top of the heating tank (1). A gear 1 (15) is fixed to the output shaft of the drive motor (14). A gear 1 (15) is fixed to the top of the outer wall of the roller 1 (10) and meshes with the gear 1 (15). The gear 2 (16) is connected, and a fixing hole 2 is provided on one side of the top of the top cover (7). The inner wall of the fixing hole 2 is rotatably connected to a vertically downward extending shaft roller 3 (17) through a bearing. Gear 3 (171) is fixed at the position corresponding to shaft roller 1 (10) on the outer wall of shaft roller 3 (17). Gear 5 (18) meshing with gear 3 (171) is fixed at the bottom of the outer wall of shaft roller 1 (10). Gear 4 (172) is fixed at the position corresponding to shaft roller 2 (12) on the outer wall of shaft roller 3 (17). The stirring component 2 (13) is provided with a connecting ring plate (19). A ring array of tooth blocks (191) is fixed at the top of the inner wall of the connecting ring plate (19). The tooth blocks (191) mesh with gear 4 (172). Multiple stirring strips (20) are fixed between the bottom of the inner wall of the connecting ring plate (19) and the shaft roller (12). Two opposing inclined stirring blades (21) are fixed to the outer wall of the stirring strips (20). Multiple stirring strips (22) are fixed to the outer wall of the stirring component (11). A vertical hole is opened at the top of the stirring strip (22) away from the shaft roller (10). A connecting ring (23) is rotatably arranged on the inner wall of the vertical hole by a torsion spring. The outer wall of the connecting ring (23) is in contact with the outer wall of the shaft roller (17). Multiple blades (24) are fixed to the inner wall of the connecting ring (23). Multiple mesh holes are opened on the side wall of the blades (24). The shaft roller (10) and shaft roller (12) are fixed to the inner wall of the connecting ring (19). A vertical through hole (25) is provided at the axial position of each of the 12). A vertically extending shaft (26) is placed at the axial position of the through hole (25). A connector (30) is fixed on the outer wall of the shaft (26) between the first shaft roller (10) and the second shaft roller (12). The outer wall of the connector (30) slides in contact with the inner wall of the through hole (25). The length of the connector (30) is less than the distance between the first shaft roller (10) and the second shaft roller (12). Multiple stirring strips (34) are fixed on the outer wall of the connector (30). A lifting plate (28) is rotatably connected to the top of the outer wall of the shaft (26) through a bearing. An electric push rod (29) is fixedly connected between the bottom of the lifting plate (28) and the top of the heating tank (1).The connector (30) has sliding parts (31) at both its top and bottom ends. The width of the sliding parts (31) is smaller than the width of the connector (30). A movable part (32) is slidably connected to the outer wall of the sliding part (31). A through hole is provided in the middle of the movable part (32) for sliding connection with the shaft (26). A spring (33) is connected between the movable part (32) and the end of the sliding part (31). The outer wall of the movable part (32) is in sliding contact with the inner wall of the through hole (25).

2. The raw material melting device for preparing a biodegradable heat-shrinkable film according to claim 1, characterized in that, The top of the outer wall of the discharge channel (3) is fixed with a bottom plate (6) that slides in contact with the bottom of the melting tank (5); The top cover (7) is provided with an upwardly extending connecting cylinder in the middle position, and the heating tank (1) is provided with a fixing hole in the middle position of the top, which is rotatably connected to the outer wall of the roller (10).

3. The raw material melting device for preparing a biodegradable heat-shrinkable film according to claim 2, characterized in that, Two ring-shaped limiting strips (501) are fixed at the positions corresponding to the stirring component 2 (13) on the inner wall of the melting tank (5). The top and bottom ends of the connecting ring plate (19) slide in contact with the two limiting strips (501) respectively.

4. The raw material melting device for preparing a biodegradable heat-shrinkable film according to claim 3, characterized in that, The length of the stirring bar 1 (22) is less than the distance between the shaft roller 3 (17) and the shaft roller 1 (10).

5. The raw material melting device for preparing a biodegradable heat-shrinkable film according to claim 4, characterized in that, The cross-section of the perforation (25) is quadrilateral; the outer wall of the shaft (26) is fixed with a spiral blade (27) at the position corresponding to the discharge channel (3).

6. The raw material melting device for preparing a biodegradable heat-shrinkable film according to claim 5, characterized in that, The lengths of the first stirring bar (22), the third stirring bar (34), and the second stirring bar (20) increase sequentially.

7. The raw material melting device for preparing a biodegradable heat-shrinkable film according to claim 5, characterized in that, Multiple fixing holes are provided on the inner wall of the melting tank (5) at positions corresponding to the stirring bar (34). A horizontally placed vent pipe (35) is fixed on the inner wall of the fixing hole (3). The vent pipe (35) is connected to the heating chamber (8). The outer wall of the vent pipe (35) is rotatably connected to a sealed heat exchange shell (36) inside the melting tank (5). The end of the vent pipe (35) away from the heating chamber (8) is connected to the heat exchange shell (36). The stirring bar (34) is in contact with the outer wall of the heat exchange shell (36).

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