Raw material blending device for manufacturing tensile multilayer composite film

Abstract

The invention belongs to the technical field of composite membrane manufacturing, and discloses a raw material blending device for manufacturing a tensile multilayer composite membrane, the raw material blending device comprises an outer box, the top of the outer box is fixedly connected with a motor, the inner part of the outer box is movably connected with a mixing assembly, and the inner part of the outer box is provided with a spraying assembly; through cooperation of a mixing assembly, a spraying assembly, a pressurizing assembly and other structures, a compatilizer and raw materials are mixed more uniformly, polymer resin is pulled through up-down reciprocating movement of a mixing rod, air in an extrusion cavity enters a liquid storage barrel through an air outlet, and meanwhile through design of the pressurizing assembly, the compatibility of the compatilizer and the raw materials is improved. According to the technical scheme, air in the liquid storage barrel is pressurized, then the compatilizer liquid in the liquid storage barrel can be sprayed into the pulled polymer resin through the spray head, and the operation is repeated, so that the compatilizer and the polymer resin are mixed more uniformly, and the mixing efficiency and effect of the blending device are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of composite film production, in particular to a raw material mixing device for producing a tensile multilayer composite film. Background Art

[0002] Tensile multilayer composite film is a film composed of multiple layers of materials, with high tensile strength and excellent mechanical properties. This film is usually used for packaging, protection and barrier applications, and is widely used in food, pharmaceutical, electronics and other industries.

[0003] In the process of producing tensile-resistant multi-layer composite films, a variety of different polymer resins are often used, and these resins may have compatibility problems during the stirring and mixing process. Therefore, most mixing devices generally pour a certain amount of compatibilizer from the top when in use, so as to promote the fusion of different polymer resins. However, since the polymer resin after hot melting will have a certain viscosity, when the existing mixing device pours the compatibilizer, the compatibilizer generally only adheres to the surface of the polymer resin and cannot penetrate deeply and evenly disperse inside the polymer resin, resulting in uneven mixing of the compatibilizer and the polymer resin, thereby affecting the raw material mixing effect and efficiency. Therefore, a raw material mixing device for producing tensile-resistant multi-layer composite films is proposed to solve the problems raised in the background technology. Summary of the invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a raw material mixing device for producing a tensile multilayer composite film, which has the advantages of making the compatibilizer and the polymer resin mix more evenly, thereby improving the mixing efficiency and effect of the mixing device.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: A raw material mixing device for producing a tensile multilayer composite film, comprising an outer box, a motor is fixedly connected to the top of the outer box, a mixing component is movably connected inside the outer box, a spraying component is arranged inside the outer box, a pressurizing component and a purification component are arranged inside the outer box, and a rotating component is movably connected inside the outer box;

[0006] The mixing assembly comprises a rotating drum, the inner wall of which is provided with a guide groove, and a mixing rod is movably connected inside the guide groove;

[0007] The spray assembly includes a liquid storage barrel and a cavity fixedly connected to the inner part of the outer box, a spray head is arranged on one side of the liquid storage barrel, an air outlet connected to the cavity is arranged on the top of the liquid storage barrel, a threaded rod is movably connected inside the cavity, and a piston plate is threadedly connected to the outer part of the threaded rod;

[0008] The rotating assembly comprises a wire drum, the inner wall of which is provided with two arc grooves in an annular shape, and a round rod is movably connected inside the arc groove;

[0009] The outside of the wire drum is wound with a rope, the end of the nozzle away from the liquid storage barrel is hinged with a cover plate, the middle of the mixing rod is fixedly connected to a second inclined block, one side of the second inclined block is fixedly connected to a toothed plate, and a discharge funnel is provided on one side of the outer box.

[0010] Preferably, the output shaft end of the motor is fixedly connected to the drum, and the guide groove is corrugated;

[0011] The outer wall of the top end of the mixing rod is provided with a connecting column movably clamped in the guide groove, and the bottom end of the mixing rod is in a scimitar shape.

[0012] Preferably, a limiting groove is provided on the inner wall of the mixing rod, and a square rod movable in the limiting groove is provided inside the top end of the outer box. When the guide groove rotates, the square rod limits the mixing rod circumferentially through the limiting groove.

[0013] Preferably, the cover plate seals one end of the nozzle in an initial state, and the bottom end of the rope is fixedly connected to the cover plate.

[0014] Preferably, the outer wall of the piston plate fits with the inner wall of the cavity, the threaded rod passes through the outer wall of the cavity and extends to the outside of the cavity, and one end of the threaded rod away from the air outlet is fixedly connected to a gear.

[0015] Preferably, the second inclined block moves upward to drive the tooth plate to engage with the gear, an air inlet connected to the purification component is provided on one side of the cavity, and one-way valves are provided inside the air outlet and the air inlet.

[0016] Preferably, a liquid replenishing port is provided on a side of the liquid storage barrel away from the nozzle, the liquid replenishing port is blocked by a soft plug in an initial state, and the liquid replenishing port penetrates the outer wall of the outer box and extends to the outside of the outer box.

[0017] Preferably, the booster assembly comprises a first inclined block movable in the cavity, and both ends of the bottom of the first inclined block are inclined;

[0018] A button located at the top of the first inclined block is arranged inside the outer box, and a compressor connected to the liquid storage barrel is fixedly connected to the outside of the outer box.

[0019] Preferably, the arc groove is 90 degrees, and one end of the round rod is provided with a protrusion that is movably engaged in the arc groove;

[0020] A limiting plate is arranged in the middle of the round rod, and spring pieces are fixedly connected to the upper and lower ends of the limiting plate, and the round rod is elastically connected to the outer box through the spring pieces.

[0021] Preferably, the inner wall of the outer box is provided with a sliding groove for horizontally limiting the upper limit plate of the round rod, the end of the round rod away from the arc groove is inclined, the top of the second inclined block is inclined, and the second inclined block abuts against the inclined surface of the round rod after moving up.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention achieves more uniform mixing of the compatibilizer and the polymer resin by coordinating structures such as a mixing component, a spray component and a booster component, thereby improving the mixing efficiency and effect of the dispensing device. The guide groove is corrugated, so that the mixing rod can be driven to move up and down reciprocatingly during the rotation of the guide groove, thereby causing the mixing rod to pull the polymer resin inside the outer box. When the mixing rod moves upward, the piston plate moves under the action of an external force, thereby squeezing the air inside the cavity into the liquid storage barrel through the air outlet. At the same time, through the design of the booster component, the air inside the liquid storage barrel is pressurized, so that the compatibilizer liquid inside the liquid storage barrel can be sprayed through the nozzle to the inside of the pulled polymer resin. This reciprocating operation makes the compatibilizer and the polymer resin mixed more uniformly, thereby improving the mixing efficiency and effect of the dispensing device.

[0024] The present invention facilitates shielding of the nozzle when not spraying through the cooperation between structures such as the rotating component, the rope, the cover plate and the second inclined block, thereby preventing the nozzle from being blocked by raw materials. After the second inclined block is driven downward by the mixing rod, the second inclined block releases the squeezing of the round rod, so that the round rod is reset under the action of the elastic force of the spring sheet, and then the round rod drives the wire drum to rotate in the opposite direction through the arc groove, and the rope is paid out. After the rope is paid out, the pull on the top of the cover plate is released, so that the cover plate is reset to seal the nozzle, and then the nozzle is protected when the spraying operation is not performed to prevent the polymer resin from clogging the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the front cross-section structure of the present invention;

[0027] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0029] Figure 5 A partial cross-sectional view of a mixing assembly of the present invention;

[0030] Figure 6It is a schematic diagram of the positional relationship among the spray assembly, the second inclined block and the tooth plate of the present invention;

[0031] Figure 7 It is a schematic diagram of the top cross-section structure of the spray assembly of the present invention;

[0032] Figure 8 It is a partial cross-sectional view of the rotating assembly of the present invention;

[0033] Fig. 9 It is a schematic diagram of the positional relationship among the spraying assembly, the rotating assembly, the rope and the cover plate of the present invention.

[0034] In the figure: 1. outer box; 2. motor; 3. mixing assembly; 31. rotating drum; 32. guide groove; 33. mixing rod; 34. limiting groove; 4. spray assembly; 41. liquid storage barrel; 42. nozzle; 43. air outlet; 44. cavity; 45. threaded rod; 46. piston plate; 47. gear; 48. one-way valve; 49. air inlet; 410. liquid filling port; 5. booster assembly; 51. first inclined block; 52. button; 53. compressor; 6. purification assembly; 7. rotating assembly; 71. bobbin; 72. arc groove; 73. round rod; 74. shrapnel; 8. rope; 9. cover plate; 10. second inclined block; 11. tooth plate; 12. discharge funnel. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] like Figures 1 to 9 As shown, the present invention provides a raw material mixing device for producing a tensile multilayer composite film, comprising an outer box 1, a motor 2 is fixedly connected to the top of the outer box 1, a mixing component 3 is movably connected inside the outer box 1, a spraying component 4 is arranged inside the outer box 1, a pressurizing component 5 and a purification component 6 are arranged inside the outer box 1, and a rotating component 7 is movably connected inside the outer box 1;

[0037] The mixing assembly 3 includes a rotating drum 31, the inner wall of the rotating drum 31 is provided with a guide groove 32, and a mixing rod 33 is movably connected inside the guide groove 32;

[0038] The spray assembly 4 includes a liquid storage barrel 41 and a cavity 44 fixedly connected to the inner part of the outer box 1, a nozzle 42 is arranged on one side of the liquid storage barrel 41, an air outlet 43 connected to the cavity 44 is arranged on the top of the liquid storage barrel 41, a threaded rod 45 is movably connected inside the cavity 44, and a piston plate 46 is threadedly connected to the outer part of the threaded rod 45;

[0039] The rotating assembly 7 includes a wire drum 71, the inner wall of which is provided with two arc grooves 72 in an annular manner, and a round rod 73 is movably connected inside the arc groove 72;

[0040] The outside of the bobbin 71 is wound with a rope 8, the end of the nozzle 42 away from the liquid storage barrel 41 is hinged with a cover plate 9, the middle of the mixing rod 33 is fixedly connected to a second inclined block 10, one side of the second inclined block 10 is fixedly connected to a tooth plate 11, and a discharge funnel 12 is provided on one side of the outer box 1.

[0041] The above scheme is adopted: the mixing rod 33 can be driven to move up and down reciprocatingly during the rotation of the guide groove 32, so that the mixing rod 33 pulls the polymer resin inside the outer box 1, and when the mixing rod 33 moves upward, the piston plate 46 moves under the action of external force, thereby squeezing the air inside the cavity 44 into the liquid storage barrel 41 through the air outlet 43. At the same time, through the design of the booster component 5, the air inside the liquid storage barrel 41 is pressurized, so that the compatibilizer liquid inside the liquid storage barrel 41 can be sprayed into the interior of the pulled polymer resin through the nozzle 42, and this operation is repeated, so that the compatibilizer and the polymer resin are mixed more evenly, thereby improving the mixing efficiency and effect of the deployment device.

[0042] like Figure 2 and Figure 5 As shown, the output shaft end of the motor 2 is fixedly connected to the rotating drum 31, the guide groove 32 is corrugated, the outer wall of the top end of the mixing rod 33 is provided with a connecting column that is movably engaged with the inside of the guide groove 32, the bottom end of the mixing rod 33 is scimitar-shaped, and the inner wall of the mixing rod 33 is provided with a limiting groove 34. A square rod that is movable in the limiting groove 34 is provided inside the top end of the outer box 1. When the guide groove 32 rotates, the square rod limits the mixing rod 33 circumferentially through the limiting groove 34.

[0043] The above scheme is adopted: the bottom end of the mixing rod 33 is scimitar-shaped, and its function is that due to the unique curved shape of the scimitar, the curved part at the bottom of the mixing rod 33 is like a hook. When the mixing rod 33 moves upward, the curved "hook" will be inserted into the polymer resin. Unlike a straight rod, the scimitar-shaped structure enables it to better grasp and stretch viscous materials, just like it is easier to scoop up liquids or solids with a curved spoon. During the upward movement of the scimitar-shaped mixing rod 33, the interaction between its curved part and the material is used to more effectively pull the polymer resin upward, so that the compatibilizer can be sprayed into the polymer resin.

[0044] like Figure 2 , Figure 4 , Figure 6 , Figure 7 and Fig. 9As shown, in the initial state, the cover plate 9 seals one end of the nozzle 42, the bottom end of the rope 8 is fixedly connected to the cover plate 9, the outer wall of the piston plate 46 fits with the inner wall of the cavity 44, the threaded rod 45 passes through the outer wall of the cavity 44 and extends to the outside of the cavity 44, and the end of the threaded rod 45 away from the air outlet 43 is fixedly connected with a gear 47, and the second inclined block 10 moves up and drives the tooth plate 11 to engage with the gear 47, and one side of the cavity 44 is provided with an air inlet 49 connected to the purification component 6, and the inside of the air outlet 43 and the air inlet 49 are both provided with a one-way valve 48, and the side of the liquid storage barrel 41 away from the nozzle 42 is provided with a liquid replenishing port 410, which is blocked by a soft plug in the initial state, and the liquid replenishing port 410 passes through the outer wall of the outer box 1 and extends to the outside of the outer box 1.

[0045] The above scheme is adopted: through the design of the purification component 6, its function is that when the piston plate 46 is reset, due to the design of the one-way valve in the air outlet 43, the piston plate 46 can only inhale air through the air inlet 49 to fill the inside of the cavity 44. Since the external air contains more impurities and dust, at this time, through the design of the purification component 6, the air entering the air inlet 49 is filtered, thereby preventing the compatibilizer from being contaminated;

[0046] Through the design of two one-way valves 48, their function is that the one-way valve 48 arranged inside the air outlet 43 is used to squeeze the air inside the cavity 44 into the interior of the liquid storage barrel 41 in one direction through the one-way valve 48, and the one-way valve 48 designed inside the air inlet 49 is used to suck the external air into the interior of the cavity 44 in one direction through the one-way valve 48 when the piston plate 46 moves, thereby ensuring the normal operation of the device.

[0047] like Figures 2 to 4 , Figure 8 As shown, the booster assembly 5 includes a first inclined block 51 movable inside the cavity 44, both ends of the bottom of the first inclined block 51 are inclined, a button 52 located at the top of the first inclined block 51 is arranged inside the outer box 1, and a compressor 53 connected to the liquid storage barrel 41 is fixedly connected to the outside of the outer box 1, the arc groove 72 is ninety degrees, and one end of the round rod 73 is provided with a protrusion that is movable and snap-connected inside the arc groove 72, and a limiting plate is arranged in the middle of the round rod 73, and the upper and lower ends of the limiting plate are fixedly connected with spring pieces 74, and the round rod 73 is elastically connected to the outer box 1 through the spring pieces 74, and the inner wall of the outer box 1 is provided with a sliding groove for horizontally limiting the upper limit plate of the round rod 73, and the end of the round rod 73 away from the arc groove 72 is inclined, and the top of the second inclined block 10 is inclined, and the second inclined block 10 abuts against the inclined surface of the round rod 73 after moving up.

[0048] The above scheme is adopted: both ends of the first inclined block 51 are inclined, and its function is that when the piston plate 46 abuts against the inclined surface of one end of the first inclined block 51 for the first time, it will squeeze the first inclined block 51 upward, and when the piston plate 46 moves and releases the abutment with the first inclined block 51, the first inclined block 51 will move downward due to its own gravity, and because both ends are inclined, the piston plate 46 can abut against the inclined surface of the other end of the first inclined block 51 when it is reset, thereby squeezing the first inclined block 51 upward again, thereby ensuring the normal operation of the device.

[0049] The working principle and use process of the present invention are as follows: the operator injects different polymer resins into the interior of the outer box 1 through the discharge funnel 12, and injects a certain amount of compatibilizer liquid into the interior of the liquid storage barrel 41 through the liquid replenishing port 410. Subsequently, the motor 2 is started to drive the rotating drum 31 to rotate, thereby causing the connecting column on the mixing rod 33 to slide along the track of the guide groove 32. Since the square rod 33 is circumferentially limited by the limiting groove 34, the connecting column can only drive the mixing rod 33 to reciprocate up and down along the track of the guide groove 32. When the mixing rod 33 moves upward, it also drives the second inclined block 10 and the tooth plate 11 outside it to move upward. At the same time, the curved knife at the bottom of the mixing rod 33 pulls the polymer resin inside the outer box 1 upward.

[0050] Subsequently, the inclined surface of the top of the second inclined block 10 abuts against the inclined surface of the round rod 73, and squeezes the round rod 73 to move toward the inside of the wire drum 71, so that the protrusion on the round rod 73 slides along the trajectory of the arc groove 72, thereby driving the wire drum 71 to rotate. While the wire drum 71 rotates, it drives the rope 8 to reel in, so that the rope 8 pulls the cover plate 9 to flip up, so that the cover plate 9 releases the seal on the nozzle 42. Subsequently, the mixing rod 33 drives the second inclined block 10 to continue to move upward until the second inclined block 10 drives the tooth plate 11 to mesh with the gear 47, and the upward movement of the tooth plate 11 drives the gear 47 and the threaded rod 45 at one end thereof to rotate, so that the piston plate 46 threadedly connected to the outside of the threaded rod 45 moves toward the direction of the air outlet 43;

[0051] When the piston plate 46 moves, it abuts against the inclined surface at the bottom end of the first inclined block 51 and squeezes the first inclined block 51 upward, so that the first inclined block 51 presses the button 52 for the first time, and then the current inside the outer box 1 flows into the coil of the relay through the button 52, so that the relay is energized. At this time, the normally open contact of the relay is closed, thereby forming a self-locking circuit, and then the current is transmitted to the compressor 53, so that the compressor 53 operates. When the piston plate 46 moves, it also squeezes the air inside the cavity 44 into the inside of the liquid storage barrel 41 through the air outlet 43. Then, the compressor 53 pressurizes the air, and then the compatibilizer liquid inside the liquid storage barrel 41 is squeezed out through the nozzle 42 by the air, and then the compatibilizer is sprayed to the inside of the elongated polymer resin;

[0052] When the connecting column on the mixing rod 33 moves downward along the trajectory of the guide groove 32, the second inclined block 10 releases the contact with the round rod 73, so that the round rod 73 is reset under the action of the elastic force of the spring piece 74, and drives the wire drum 71 to rotate in the opposite direction to release the rope 8. After the rope 8 is released, the cover plate 9 is closed. At the same time, when the second inclined block 10 drives the tooth plate 11 to move downward, the gear 47 drives the threaded rod 45 to reverse, thereby causing the piston plate 46 to move in the opposite direction and abut against the inclined surface at the other end of the first inclined block 51, thereby squeezing the first inclined block 51 upward, pressing the button 52 for the second time, thereby disconnecting the normally open contact of the relay, and stopping the compressor 53. While the mixing rod 33 moves downward, the compatibilizer and the polymer resin are mixed. This operation is repeated, so that the mixing rod 33 moves up and down multiple times, thereby driving the compatibilizer to be sprayed multiple times inside different polymer resins, thereby improving the mixing efficiency and uniformity of the compatibilizer and the polymer resin.

[0053] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A raw material mixing device for producing a tensile multilayer composite film, comprising an outer box (1), characterized in that: The top of the outer box (1) is fixedly connected to a motor (2), the interior of the outer box (1) is movably connected to a mixing assembly (3), the interior of the outer box (1) is provided with a spraying assembly (4), the interior of the outer box (1) is provided with a boosting assembly (5) and a purification assembly (6), and the interior of the outer box (1) is movably connected to a rotating assembly (7); The mixing assembly (3) comprises a rotating drum (31), the inner wall of the rotating drum (31) is provided with a guide groove (32), and a mixing rod (33) is movably connected inside the guide groove (32); The spray assembly (4) comprises a liquid storage barrel (41) and a cavity (44) fixedly connected to the interior of the outer box (1); a spray head (42) is arranged on one side of the liquid storage barrel (41); an air outlet (43) communicating with the cavity (44) is arranged on the top of the liquid storage barrel (41); a threaded rod (45) is movably connected inside the cavity (44); and a piston plate (46) is threadedly connected to the outside of the threaded rod (45); The rotating assembly (7) comprises a wire drum (71), the inner wall of the wire drum (71) is provided with two arc grooves (72) in an annular shape, and a round rod (73) is movably connected inside the arc groove (72); The outside of the wire drum (71) is wound with a rope (8), one end of the nozzle (42) away from the liquid storage barrel (41) is hinged with a cover plate (9), the middle of the mixing rod (33) is fixedly connected to a second inclined block (10), one side of the second inclined block (10) is fixedly connected to a tooth plate (11), and one side of the outer box (1) is provided with a discharge funnel (12).

2. The raw material mixing device for producing a tensile multilayer composite film according to claim 1, characterized in that: The output shaft end of the motor (2) is fixedly connected to the rotating drum (31), and the guide groove (32) is corrugated; The outer wall of the top end of the mixing rod (33) is provided with a connecting column movably engaged in the guide groove (32), and the bottom end of the mixing rod (33) is in a scimitar shape.

3. The raw material mixing device for producing a tensile multilayer composite film according to claim 1, characterized in that: The inner wall of the mixing rod (33) is provided with a limiting groove (34), and the top end of the outer box (1) is provided with a square rod movable in the limiting groove (34). When the guide groove (32) rotates, the square rod limits the mixing rod (33) in a circumferential direction through the limiting groove (34).

4. The raw material mixing device for producing a tensile multilayer composite film according to claim 1, characterized in that: The cover plate (9) seals one end of the nozzle (42) in an initial state, and the bottom end of the rope (8) is fixedly connected to the cover plate (9).

5. The raw material mixing device for producing a tensile multilayer composite film according to claim 1, characterized in that: The outer wall of the piston plate (46) fits with the inner wall of the cavity (44), the threaded rod (45) penetrates the outer wall of the cavity (44) and extends to the outside of the cavity (44), and one end of the threaded rod (45) away from the air outlet (43) is fixedly connected to a gear (47).

6. The raw material mixing device for producing a tensile multilayer composite film according to claim 1, characterized in that: After the second inclined block (10) moves upward, it drives the tooth plate (11) to mesh with the gear (47); one side of the cavity (44) is provided with an air inlet (49) connected to the purification component (6); and one-way valves (48) are provided inside the air outlet (43) and the air inlet (49).

7. The raw material mixing device for producing a tensile multilayer composite film according to claim 1, characterized in that: A liquid replenishing port (410) is provided on a side of the liquid storage barrel (41) away from the nozzle (42); the liquid replenishing port (410) is blocked by a soft plug in an initial state; the liquid replenishing port (410) penetrates the outer wall of the outer box (1) and extends to the outside of the outer box (1).

8. The raw material mixing device for producing a tensile multilayer composite film according to claim 1, characterized in that: The booster assembly (5) comprises a first inclined block (51) movable inside the cavity (44), and both ends of the bottom of the first inclined block (51) are inclined. A button (52) located at the top of the first inclined block (51) is arranged inside the outer box (1), and a compressor (53) connected to the liquid storage barrel (41) is fixedly connected to the outside of the outer box (1).

9. The raw material mixing device for producing a tensile multilayer composite film according to claim 1, characterized in that: The arc groove (72) is 90 degrees, and one end of the round rod (73) is provided with a protrusion that is movably engaged with the inside of the arc groove (72); A limiting plate is arranged in the middle of the round rod (73), and spring plates (74) are fixedly connected to the upper and lower ends of the limiting plate. The round rod (73) is elastically connected to the outer box (1) via the spring plates (74).

10. The raw material mixing device for producing a tensile multilayer composite film according to claim 1, characterized in that: The inner wall of the outer box (1) is provided with a sliding groove for horizontally limiting the upper limit plate of the round rod (73); the end of the round rod (73) away from the arc groove (72) is in the shape of an inclined surface; the top end of the second inclined block (10) is in the shape of an inclined surface; and the second inclined block (10) abuts against the inclined surface of the round rod (73) after moving upward.

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