Batch weighing and preliminary mixing device for EVA (Ethylene Vinyl Acetate) adhesive film production

Abstract

The utility model relates to a batch weighing and preliminary mixing device for EVA (Ethylene Vinyl Acetate) adhesive film production. Comprising a support, a stirring barrel is fixedly connected to the support, and a stirring structure is arranged in the stirring barrel; a middle adapter barrel hinged to the stirring barrel is in butt joint with the stirring barrel, and a hopper mounting barrel hinged to the middle adapter barrel is in butt joint with the middle adapter barrel; a plurality of groups of storage hoppers are mounted in an inner cavity of the hopper mounting cylinder, an upper gate valve assembly is mounted on each storage hopper, and a metering hopper assembly with a weighing function is arranged below each storage hopper; a lower gate valve assembly is mounted at the discharge end of each metering hopper assembly; the hopper cleaning assembly is arranged in an inner cavity of the storage hopper and is in sliding contact with the inner wall of the storage hopper, and the lifting driving assembly is used for driving the hopper cleaning assembly to slide along the inner wall of the storage hopper. According to the utility model, various solid particle raw materials can be automatically weighed and mixed, and the hopper is automatically cleaned, so that the labor intensity of workers is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of EVA film production equipment, in particular to a batch weighing and preliminary mixing device for EVA film production. Background Art

[0002] EVA film is a high-viscosity thin film material sheet made of polymer resin (ethylene-vinyl acetate copolymer) as the main raw material, added with special additives, and processed by special equipment. It is also known as modified "EVA laminated glass film" in the industry. It has strong adhesion to inorganic glass and has the characteristics of toughness, transparency, heat resistance, cold resistance, high bonding strength, high elongation at break, and good moisture resistance. It is the most common packaging material in the manufacture of solar photovoltaic modules, and it is the ideal and economical adhesive material for manufacturing safety laminated glass in the world. It can partially replace PVB material for use in the automotive and construction industries. The safety laminated glass produced with it can achieve ideal effects such as safety, heat preservation, wind resistance, impact resistance, sound insulation, and UV protection.

[0003] The EVA film production process involves mixing EVA particles with various additives, then melt-extruding and casting them into a film. Finally, the film is cooled and shaped to obtain the desired EVA film. During the EVA film production process, plastic particles of different colors, shapes, and compositions must be mixed together. Existing mixing devices pre-weigh the plastic particles of different colors, shapes, and compositions as required. After weighing, the plastic particles of different colors, shapes, and compositions are then placed in the mixing device for mixing.

[0004] In the EVA film production process, the weighing operation before the raw materials are mixed is mostly done manually by staff. The operation process is cumbersome and labor-intensive, which reduces the production efficiency of the EVA film. Moreover, the manual operation process is prone to large errors, which in turn affects the production quality of the EVA film. In addition, the existing mixing device has the problem of being difficult to clean the hopper. In actual work, manual cleaning is mostly required, the operation is cumbersome, and the work efficiency is low. Therefore, it is urgent to design a batch weighing preliminary mixing device to solve the above problems. Utility Model Content

[0005] The utility model aims to solve the technical problems existing in the prior art and provides a batch weighing and preliminary mixing device for EVA film production with a reasonable structural design and high working efficiency. The utility model can automatically weigh and mix multiple solid particle raw materials and automatically clean the hopper, reducing the labor intensity of the staff.

[0006] The utility model adopts the technical solution adopted to solve the technical problems existing in the known technology as follows: a batch weighing preliminary mixing device for EVA film production includes a bracket, a stirring barrel with a mixing material discharge port at the bottom is fixedly connected to the bracket, and a stirring structure is arranged in the stirring barrel; an intermediate transfer barrel is connected to the stirring barrel through a hinge at the top open end, and a hopper installation barrel is connected to the intermediate transfer barrel through a hinge at the top open end; a plurality of storage hoppers are installed in the inner cavity of the hopper installation barrel, and a plurality of storage hoppers are installed in each storage hopper. An upper plug valve assembly is installed at the bottom discharge end of the hopper, and a metering hopper assembly with a weighing function is provided under each storage hopper. Each metering hopper assembly is installed in the intermediate adapter cylinder and is connected to the intermediate adapter cylinder through a metering hopper mounting seat installed in the intermediate adapter cylinder; a lower plug valve assembly is installed at the discharge end of each metering hopper assembly; it also includes a hopper cleaning assembly provided in the inner cavity of the storage hopper and in sliding contact with its inner wall, and also includes a lifting drive assembly for driving the hopper cleaning assembly to slide along the inner wall of the storage hopper.

[0007] The advantages and positive effects of the utility model are as follows: the utility model provides a batch weighing preliminary mixing device for EVA film production. By setting multiple groups of storage hoppers, multiple groups of granular raw materials can be packaged. By setting a metering hopper assembly and a lower plug-in valve assembly, the weight of the material put into it from the storage hopper can be detected in real time, and the weight of the material fed into the mixing barrel can be controlled by the difference in the detected values. Compared with the traditional manual direct weighing and feeding operation, the metering hopper assembly feeds accurately and saves time and labor, reduces manual labor intensity, and improves work efficiency; by setting a hopper cleaning assembly and a lifting drive assembly, the material adhered to the inner wall of the storage hopper can be automatically cleaned, avoiding manual cleaning, the operation process is simple, and the work efficiency is high; by setting a stirring structure, a variety of materials mixed in the mixing barrel can be stirred, and then a mixing operation can be performed.

[0008] Preferably: it also includes a first gas spring arranged between the mixing barrel and the intermediate transfer cylinder and movably connected to the two, and also includes a second gas spring arranged between the hopper mounting cylinder and the intermediate transfer cylinder and movably connected to the two; one hinged end of the intermediate transfer cylinder is located at the lower end of one side wall thereof, and the other hinged end is located at the upper end of the opposite side wall.

[0009] Preferably, a transition port connected to the hopper mounting cylinder is provided at the discharge end of each storage hopper, and each transition port extends into the top opening of its corresponding metering hopper assembly.

[0010] Preferably, the metering hopper assembly includes a metering hopper having a discharge inclined surface, a sensor mounting seat is mounted on the discharge inclined surface of the metering hopper, and a weighing sensor is mounted between the sensor mounting seat and the metering hopper mounting seat.

[0011] Preferably, the lower gate valve assembly includes two groups of gate guide groove members arranged opposite to each other, and oppositely arranged sliding grooves are provided on the opposite surfaces of the two groups of gate guide groove members; it also includes a gate valve arranged between the two groups of gate guide groove members, inserted in the sliding groove and in sliding contact with the sliding groove; it also includes a gate cylinder for driving the gate valve to slide along the extension direction of the sliding groove.

[0012] Preferably, the structure of the upper plug-in valve assembly is consistent with that of the lower plug-in valve assembly.

[0013] Preferably, the hopper cleaning assembly includes a lifting mounting frame connected to the lifting drive assembly, and four groups of scraping units corresponding to the four inner walls of the storage hopper are installed on the lifting mounting frame; two adjacent groups of scraping units are distributed up and down.

[0014] Preferably: the scraper unit includes a telescopic guide rod slidably connected to the lifting mounting frame through a linear bearing, a guide sleeve with a tapered opening on the outer side surface is fixedly connected to the outer end portion of the telescopic guide rod, two groups of scraper knives in sliding contact with the guide sleeve are passed through the inner cavity of the guide sleeve, a scraper spring is provided between the two groups of scraper knives and is in tight contact with the two groups of scraper knives, and each scraper knife is slidably connected to the inner wall of the storage hopper; it also includes a spring top plate mounted on the telescopic guide rod, and a tightening spring mounted on the telescopic guide rod is provided between the spring top plate and the lifting mounting frame.

[0015] Preferably: the lifting drive assembly includes two sets of oppositely arranged rack guide sleeves installed on the top of the hopper mounting cylinder, each rack guide sleeve is rotatably connected to a lifting gear, and a lifting shaft is provided between the two sets of lifting gears to connect the two together; each rack guide sleeve is penetrated by a cylindrical rack slidably connected to it and arranged longitudinally, and the cylindrical rack is engaged with the corresponding lifting gear; and also includes a lifting motor for driving the lifting shaft to rotate.

[0016] Preferably: the stirring structure includes a horizontally arranged stirring shaft connected for rotation in the stirring barrel, and a plurality of groups of long stirring blades and a plurality of groups of short stirring blades are fixedly connected to the outer peripheral wall of the stirring shaft and staggered along its axial direction at different angles; it also includes fixed stirring blades fixed to the inner wall of the stirring barrel; and it also includes a drive motor for driving the stirring shaft to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0018] Figure 2 yes Figure 1 An enlarged schematic diagram of the hopper cleaning assembly in FIG.

[0019] Figure 3 It is a three-dimensional structural diagram of the lower plug-in valve assembly and the metering bucket assembly in the utility model;

[0020] Figure 4 This is a schematic diagram of the three-dimensional structure of the lifting drive assembly in the utility model;

[0021] Figure 5 It is a schematic diagram of the main structure of the stirring structure in the present invention.

[0022] Figure: 1. Bracket; 2. Mixing outlet; 3. Stirring structure; 3-1. Stirring shaft; 3-2. Long stirring blade; 3-3. Fixed stirring blade; 3-4. Short stirring blade; 4. Stirring barrel; 5. First gas spring; 6. Lower gate valve assembly; 6-1. Gate cylinder; 6-2. Gate guide; 6-3. Gate valve; 7. Metering hopper mounting base; 8. Second gas spring; 9. Metering hopper assembly; 9-1. Metering hopper; 9-2. Discharging slope; 9-3. Weighing sensor; 9-4. Sensor mounting base; 10. Transition port; 11. Upper plug-in valve assembly; 12. Hopper cleaning assembly; 12-1. Guide sleeve; 12-2. Scraper knife; 12-3. Scraper spring; 12-4. Telescopic guide rod; 12-5. Spring top plate; 12-6. Tightening spring; 12-7. Lifting mounting frame; 13. Storage hopper; 14. Feed inlet; 15. Lifting drive assembly; 15-1. Lifting shaft; 15-2. Lifting gear; 15-3. Rack guide sleeve; 15-4. Lifting motor; 15-5. Cylindrical rack; 16. Hopper mounting cylinder; 17. Intermediate adapter cylinder. DETAILED DESCRIPTION

[0023] In order to further understand the content, features and effects of the present invention, the following embodiments are given to explain in detail:

[0024] See Figure 1 The batch weighing and preliminary mixing device for EVA film production of the present invention comprises a support 1, to which is fixedly mounted a mixing barrel 4 having a mixing outlet 2 at the bottom. A discharge valve (not shown) is mounted on the mixing outlet 2. The discharge valve may be a planetary discharge valve. In this embodiment, the bottom surface of the mixing barrel 4 is curved, and a stirring structure 3 is disposed within the mixing barrel 4. For further information, see Figure 5, wherein the stirring structure 3 includes a horizontally arranged stirring shaft 3-1 that is rotatably connected within the stirring barrel 4, and a plurality of groups of long stirring blades 3-2 and a plurality of groups of short stirring blades 3-4 are fixedly connected to the outer peripheral wall of the stirring shaft 3-1 and staggered along its axial direction at different angles. The stirring blades installed on the stirring shaft 3-1 are staggered along the axial direction at different angles so that the stress borne by the stirring shaft 3-1 during stirring is uniform and the maximum torsional stress of the stirring shaft 3-1 is reduced. In addition, the stirring structure 3 also includes a fixed stirring blade 3-3 fixedly connected to the inner wall of the stirring barrel 4, and a driving motor for driving the stirring shaft 3-1 to rotate is also provided outside the stirring barrel 4. By providing the stirring structure 3, the stirring barrel 4 can be driven to stir the mixed material therein. In addition, in order to facilitate the injection of liquid additives into the inner cavity of the stirring barrel 4, a liquid pipe section connected to its inner cavity is connected to the outer peripheral wall of the stirring barrel 4.

[0025] like Figure 1 As shown, an intermediate transfer tube 17 is connected to the top open end of the mixing barrel 4. The intermediate transfer tube 17 and the mixing barrel 4 are hingedly connected. The hopper mounting tube 16 is connected to the top open end of the intermediate transfer tube 17 by a hinge. To facilitate disassembly and routine maintenance, this embodiment also includes a first gas spring 5 movably connected to the mixing barrel 4 and the intermediate transfer tube 17, and a second gas spring 8 movably connected to the hopper mounting tube 16 and the intermediate transfer tube 17. One hinged end of the intermediate transfer tube 17 is located at the lower end of one side wall, and the other hinged end is located at the upper end of the opposite side wall. Through the above arrangement, the entire barrel of the mixing device is divided into three parts, and the three parts are movably connected to each other, making it convenient for operators to open the various parts of the barrel according to maintenance needs.

[0026] like Figure 1 As shown, multiple groups of storage hoppers 13 are installed in the inner cavity of the hopper mounting barrel 16. The storage hoppers 13 are inverted square hoppers in the shape of a quadrangular pyramid. To facilitate disassembly and assembly, daily maintenance, and to fully utilize the space, the multiple groups of storage hoppers 13 are arranged in rows, and two rows are provided. In addition, a mounting plate with multiple groups of discharge ports is installed at the lower end of the hopper mounting barrel 16. The lower end of each storage hopper 13 is respectively connected to the corresponding discharge port on the mounting plate. An upper plug-in valve assembly 11 is installed at each discharge port of the mounting plate. By setting the upper plug-in valve assembly 11, the discharge of each storage hopper 13 can be automatically controlled. Each upper plug-in valve assembly 11 is connected to the hopper mounting barrel 16 through a profile. A weighing hopper assembly 9 with a weighing function is located below each storage hopper 13. A transition port 10 connected to a hopper mounting cylinder 16 is located at the discharge end of each storage hopper 13. Each transition port 10 extends into the top opening of its corresponding weighing hopper assembly 9. Furthermore, a lower gate valve assembly 6 is installed at the discharge end of each weighing hopper assembly 9.

[0027] like Figure 1 As shown, each metering bucket assembly 9 is installed in the intermediate adapter tube 17 and connected to the intermediate adapter tube 17 through the metering bucket mounting seat 7 installed in the intermediate adapter tube 17; see further Figure 3 The metering hopper assembly 9 includes a metering hopper 9-1 having a discharge slope 9-2, a sensor mounting seat 9-4 is installed on the discharge slope 9-2 of the metering hopper 9-1, and also includes a weighing sensor 9-3 installed between the sensor mounting seat 9-4 and the metering hopper mounting seat 7.

[0028] Compared to the conventional technique of frequently opening the upper plug valve assembly 11 for repeated unloading operations, this embodiment, by providing a metering hopper assembly 9, allows the raw materials in the storage hopper 13 to be injected into the metering hopper assembly 9 in batches, and then a quantitative discharge operation is performed. This configuration prevents a large amount of air from entering the storage hopper 13 after frequent opening of the upper plug valve assembly 11, thereby preventing the raw materials in the storage hopper 13 from being contaminated. The weight of the raw materials in the metering hopper assembly 9 can be detected in real time by providing a weighing sensor 9-3. During actual operation, the change in the value detected by the weighing sensor 9-3 between the two times is the change in the weight of the raw materials in the metering hopper assembly 9, that is, the weight of the material released into the mixing barrel 4 in a single time.

[0029] like Figure 3 As shown, in this embodiment, the lower plug-in plate valve assembly 6 includes two groups of plug-in plate guide groove members 6-2 arranged oppositely, and oppositely arranged slide grooves are provided on the opposite surfaces of the two groups of plug-in plate guide groove members 6-2. It also includes a plug-in plate valve 6-3 arranged between the two groups of plug-in plate guide groove members 6-2, and the plug-in plate valve 6-3 is inserted in the slide grooves of the two groups of plug-in plate guide groove members 6-2 and is in sliding contact with them. The laterally moving plug-in plate valve 6-3 can open / close the discharge port of the metering hopper 9-1; the lower plug-in plate valve assembly 6 also includes a plug-in plate cylinder 6-1 for driving the plug-in plate valve 6-3 to slide along the extension direction of the slide groove. In order to install the plug-in plate cylinder 6-1, a cylinder seat is installed on the sensor mounting seat 9-4, and the cylinder barrel of the plug-in plate cylinder 6-1 is connected to the sensor mounting seat 9-4 by bolts.

[0030] In addition, in this embodiment, the structure of the upper flapper valve assembly 11 is consistent with that of the lower flapper valve assembly 6. The cylinder barrel of the flapper cylinder in the upper flapper valve assembly 11 is connected to the hopper mounting barrel 16 through a profile.

[0031] like Figure 1 As shown, in order to automatically clean the inner wall of the storage hopper 13, this embodiment also includes a hopper cleaning assembly 12 arranged in the inner cavity of the storage hopper 13 and in sliding contact with its inner wall, and also includes a lifting drive assembly 15 for driving the hopper cleaning assembly 12 to slide along the inner wall of the storage hopper 13.

[0032] See further Figure 2 The hopper cleaning assembly 12 includes a lifting mounting frame 12-7 connected to the lifting drive assembly 15, and four groups of scraper units corresponding to the four inner walls of the storage hopper 13 are installed on the lifting mounting frame 12-7; wherein the scraper unit includes a telescopic guide rod 12-4 slidingly connected to the lifting mounting frame 12-7 through a linear bearing, and a guide sleeve 12-1 with a narrowed opening at the outer side surface is fixed to the outer end of the telescopic guide rod 12-4, and two groups of scraper knives 12-2 in sliding contact with the guide sleeve 12-1 are provided in the inner cavity of the guide sleeve 12-1, and a scraper spring 12-3 is provided between the two groups of scraper knives 12-2 and in tight contact with the two groups of scraper knives, and each scraper knife 12-2 is slidably connected to the inner wall of the storage hopper 13. The scraper unit also includes a spring top plate 12-5 sleeved on the telescopic guide rod 12-4, and a tensioning spring 12-6 sleeved on the telescopic guide rod 12-4 is provided between the spring top plate 12-5 and the lifting mounting frame 12-7.

[0033] See further Figure 2 The two adjacent groups of scraper units are distributed up and down, and the two opposite groups of scraper units are at the same height. There are two groups of telescopic guide rods 12-4 in each scraper unit. The telescopic guide rods 12-4 in the two opposite groups of scraper units are staggered to avoid mutual interference between the multiple telescopic guide rods 12-4 during the telescopic process. A through hole is provided on each side wall of the lifting mounting frame 12-7 for the opposite telescopic guide rods 12-4 to pass through.

[0034] See further Figure 4 The lifting drive assembly 15 includes two sets of oppositely arranged rack guide sleeves 15-3 installed on the top of the hopper mounting tube 16, and a lifting gear 15-2 is rotatably connected in each rack guide sleeve 15-3. A lifting shaft 15-1 is provided between the two sets of lifting gears 15-2 to connect the two sets of lifting gears 15-2 as a whole; a cylindrical rack 15-5 is slidably connected to each rack guide sleeve 15-3 and arranged longitudinally, and the cylindrical rack 15-5 is engaged with the corresponding lifting gear 15-2; and it also includes a lifting motor 15-4 for driving the lifting shaft 15-1 to rotate, and the lifting motor 15-4 is connected to the cover plate that is buckled at the top open part of the hopper mounting tube 16, and a plurality of feed ports 14 corresponding to each storage hopper 13 are provided on the above-mentioned cover plate.

[0035] The cleaning principle of the storage hopper 13: When there is material stuck on the inner wall of the storage hopper 13, the lifting motor 15-4 is started, and the lifting motor 15-4 drives the lifting shaft 15-1 to rotate. When the lifting shaft 15-1 rotates, it drives the lifting gear 15-2 to rotate. When the lifting gear 15-2 rotates, it drives the cylindrical rack 15-5 engaged with it to move longitudinally downward, thereby driving the scraper 12-2 to move downward. At the same time, under the elastic force of the tightening spring 12-6, the scraper 12-2 can move downward while sliding in contact with the inner wall of the storage hopper 13. When the scraper 12-2 slides, it can clean the material stuck on the inner wall of the storage hopper 13. After the cleaning is completed, the lifting motor 15-4 is started, and the lifting motor 15-4 drives the lifting shaft 15-1 to rotate in the opposite direction. When the lifting shaft 15-1 rotates, it drives the lifting gear 15-2 to rotate, and then drives the cylindrical rack 15-5 engaged with it to move longitudinally upward until the scraper 12-2 is lifted to the top of the storage hopper 13 to avoid affecting the normal operation of the storage hopper 13.

[0036] Working process:

[0037] (1) Multiple groups of materials to be mixed are injected into each storage hopper 13 by a feeding device or manual operation. When mixing is required, each upper plug valve assembly 11 is activated respectively, and then the corresponding storage hopper 13 is opened until part of the material in each storage hopper 13 falls into the corresponding metering hopper 9-1. During the completion of the above operation, each lower plug valve assembly 6 is always in a closed state;

[0038] (2) When the lower plug-in valve assembly 6 is in a closed state, the value detected by the weighing sensor 9-3 that does not change in real time is marked as the initial value, and then the lower plug-in valve assembly 6 is started, and then the discharge port of the metering hopper 9-1 is opened. At this time, the material in the metering hopper 9-1 will fall into the mixing barrel 4 under the action of gravity. During this process, the value detected by the weighing sensor 9-3 gradually decreases. The difference between the value detected in real time by the weighing sensor 9-3 and the initial value is marked as a, and a is the weight of the material dropped into the mixing barrel 4. In the actual control process, the size of the opening of the lower plug valve assembly 6 can be controlled according to the difference between a and the preset weight of the required material, thereby controlling the weight of the material falling per unit time. Specifically, the smaller the difference between a and the preset weight of the required material, the smaller the opening of the lower plug valve assembly 6, thereby improving the accuracy of material packaging; when a is equal to the preset weight of the required material, the lower plug valve assembly 6 completely closes the discharge port of the metering hopper 9-1, thereby realizing automatic weighing and feeding of the material;

[0039] (3) After each storage hopper 13 has completed the automatic weighing and feeding operation, the stirring structure 3 is started to stir the various materials in the stirring barrel 4. At the same time, additives can be injected into the inner cavity of the stirring barrel 4 through the liquid pipe section installed on the stirring barrel 4.

[0040] (4) After the material in the storage hopper 13 is completely put into the mixing barrel 4, the lifting drive assembly 15 is started to drive the hopper cleaning assembly 12 to clean the inner wall of the storage hopper 13. The specific cleaning principle is as described above and will not be repeated here.

Claims

1. A batch weighing and preliminary mixing device for EVA film production, characterized by: The invention comprises a bracket (1), a mixing barrel (4) having a mixing material discharge port (2) at the bottom thereof fixedly connected to the bracket (1), and a mixing structure (3) arranged in the mixing barrel (4); an intermediate transfer barrel (17) hingedly connected to the mixing barrel (4) through a hinge is butted against the top open end of the mixing barrel (4), and a hopper mounting barrel (16) hingedly connected to the mixing barrel (17) through a hinge is butted against the top open end of the intermediate transfer barrel (17); A plurality of storage hoppers (13) are installed in the inner cavity of the hopper mounting cylinder (16), an upper plug valve assembly (11) is installed at the bottom discharge end of each storage hopper (13), a metering hopper assembly (9) with a weighing function is provided below each storage hopper (13), each metering hopper assembly (9) is installed in the intermediate transfer cylinder (17) and connected to the intermediate transfer cylinder (17) via a metering hopper mounting seat (7) installed in the intermediate transfer cylinder (17); a lower plug valve assembly (6) is installed at the discharge end of each metering hopper assembly (9); a hopper cleaning assembly (12) is provided in the inner cavity of the storage hopper (13) and in sliding contact with the inner wall thereof, and a lifting drive assembly (15) is provided for driving the hopper cleaning assembly (12) to slide along the inner wall of the storage hopper (13).

2. The batch weighing preliminary mixing device for EVA film production according to claim 1, characterized in that: The invention also includes a first gas spring (5) provided between the mixing barrel (4) and the intermediate transfer barrel (17) and movably connected to the two, and a second gas spring (8) provided between the hopper mounting barrel (16) and the intermediate transfer barrel (17) and movably connected to the two; one hinged end of the intermediate transfer barrel (17) is located at the lower end of one side wall thereof, and the other hinged end is located at the upper end of the opposite side wall.

3. The EVA film production batch weighing preliminary mixing device as claimed in claim 1, characterized in that: The discharge end of each storage hopper (13) is provided with a transition material port (10) connected to the hopper mounting cylinder (16), and each transition material port (10) extends into the top opening of its corresponding metering hopper assembly (9).

4. The batch weighing preliminary mixing device for EVA film production according to claim 1, characterized in that: The metering hopper assembly (9) comprises a metering hopper (9-1) having a discharge inclined surface (9-2), a sensor mounting seat (9-4) mounted on the discharge inclined surface (9-2) of the metering hopper (9-1), and a weighing sensor (9-3) mounted between the sensor mounting seat (9-4) and the metering hopper mounting seat (7).

5. The batch weighing preliminary mixing device for EVA film production according to claim 1, characterized in that: The lower gate valve assembly (6) comprises two groups of gate guide groove members (6-2) arranged opposite to each other, and the two groups of gate guide groove members (6-2) are provided with oppositely arranged sliding grooves on their opposite surfaces; the lower gate valve (6-3) is arranged between the two groups of gate guide groove members (6-2), inserted in the sliding grooves and in sliding contact with the sliding grooves; and the lower gate valve assembly (6) comprises a gate cylinder (6-1) for driving the gate valve (6-3) to slide along the extending direction of the sliding grooves.

6. The batch weighing preliminary mixing device for EVA film production according to claim 5, characterized in that: The structure of the upper plug-in plate valve assembly (11) is consistent with the structure of the lower plug-in plate valve assembly (6).

7. The batch weighing preliminary mixing device for EVA film production according to claim 1, characterized in that: The hopper cleaning assembly (12) includes a lifting mounting frame (12-7) connected to the lifting drive assembly (15), and four groups of scraping units corresponding to the four inner walls of the storage hopper (13) are installed on the lifting mounting frame (12-7); two adjacent groups of scraping units are distributed in an upper and lower manner.

8. The batch weighing preliminary mixing device for EVA film production according to claim 7, characterized in that: The scraper unit comprises a telescopic guide rod (12-4) slidably connected to a lifting mounting frame (12-7) via a linear bearing; a guide sleeve (12-1) having a constricted opening at an outer side surface is fixedly connected to the outer end of the telescopic guide rod (12-4); two groups of scraper knives (12-2) in sliding contact with the guide sleeve (12-1) are provided in the inner cavity of the guide sleeve (12-1); a scraper spring (12-3) in tight contact with the two groups of scraper knives (12-2) is provided between the two groups of scraper knives (12-2); and each scraper knives (12-2) is slidably connected to the inner wall of the storage hopper (13); and further comprises a spring top plate (12-5) sleeved on the telescopic guide rod (12-4); and a tightening spring (12-6) sleeved on the telescopic guide rod (12-4) is provided between the spring top plate (12-5) and the lifting mounting frame (12-7).

9. The batch weighing preliminary mixing device for EVA film production according to claim 1, characterized in that: The lifting drive assembly (15) comprises two sets of rack guide sleeves (15-3) installed on the top of the hopper installation cylinder (16), each of which is rotatably connected to a lifting gear (15-2), and a lifting shaft (15-1) is provided between the two sets of lifting gears (15-2) to connect the two sets of lifting gears (15-2) as a whole; each rack guide sleeve (15-3) is penetrated by a cylindrical rack (15-5) slidably connected thereto and longitudinally arranged, and the cylindrical rack (15-5) is meshed with the corresponding lifting gear (15-2); and the lifting drive assembly (15) also comprises a lifting motor (15-4) for driving the lifting shaft (15-1) to rotate.

10. The batch weighing preliminary mixing device for EVA film production according to claim 1, characterized in that: The stirring structure (3) includes a stirring shaft (3-1) arranged transversely and rotatably connected in a stirring barrel (4); a plurality of groups of long stirring blades (3-2) and a plurality of groups of short stirring blades (3-4) are fixedly connected to the outer peripheral wall of the stirring shaft (3-1) and are staggered and distributed along the axis at different angles; a fixed stirring blade (3-3) is fixedly connected to the inner wall of the stirring barrel (4); and a driving motor is further provided for driving the stirring shaft (3-1) to rotate.

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