Preforming device for nitrocellulose spherical particles

Abstract

The utility model relates to the technical field of cellulose production, in particular to a nitrocellulose spherical particle preforming device, which comprises a shell, a feeding pipeline, an extrusion cylindrical forming pore plate and a cutting component, and the working flow of the preforming device is as follows: viscous nitrocellulose enters a feeding cavity through the feeding pipeline; the viscous nitrocellulose entering the feeding cavity is formed into cylindrical rod-shaped nitrocellulose through the forming structure, the cutting assembly works, the rotating shaft drives the cutting knife to rotate around the cutting assembly, the cylindrical rod-shaped nitrocellulose formed through the forming structure is cut into cylindrical nitrocellulose particles through the cutting knife, and then the cylindrical nitrocellulose particles are formed. Meanwhile, a diluting solvent enters the cylindrical particle forming cavity through a diluting solvent liquid inlet pipeline, the diluting solvent and the cylindrical nitrocellulose particles are mixed together to form a first mixed solution, and the first mixed solution is conveyed out through a cylindrical particle discharging pipeline; further, the nitrocellulose spherical particles which are convenient to transport, automatic in barrel dumping and good in dissolving property are prepared.

Description

Technical Field

[0001] The utility model relates to the technical field of cellulose production, in particular to a preforming device for spherical nitrocellulose particles. Background Art

[0002] Nitrocellulose, commonly known as nitrocellulose or nitrocellulose, is a cellulose nitrate ester obtained by the esterification reaction of nitric and sulfuric acid with cellulose. The nitrogen content of nitrocellulose directly determines its energy content, and it is primarily categorized as high-nitrogen energetic nitrocellulose and low-nitrogen industrial nitrocellulose. Energetic nitrocellulose is the primary building block for propellants and gun propellants. Initially a single-base propellant, it has evolved into double-base propellants, modified double-base propellants, and triple-base propellants. Industrial nitrocellulose is primarily used in coatings, paints, inks, and leather brighteners.

[0003] At present, nitrocellulose mainly comes in the form of flocculent nitrocellulose and compressed nitrocellulose. Flocculent nitrocellulose has a low bulk density of only 0.1-0.15g / mL and high transportation cost. Due to its long fibers, the materials are entangled with each other, making it difficult to achieve automatic barrel pouring and automated production. Bucket pouring refers to pouring the nitrocellulose out of the barrel; compressed nitrocellulose has a higher bulk density, which is convenient for transportation and automatic barrel pouring, but the solubility and plasticization properties of compressed nitrocellulose are reduced, affecting subsequent use. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a preforming device for nitrocellulose spherical particles, which can shape viscous nitrocellulose into nitrocellulose cylindrical particles, thereby preparing nitrocellulose spherical particles that are easy to transport and automatically pour into barrels and have good solubility.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a preforming device for nitrocellulose spherical particles, comprising a shell, a feed pipe, an extruded cylindrical forming orifice plate, and a cutting assembly, wherein at least one group of forming structures is provided on the extruded cylindrical forming orifice plate, the shell is vertically arranged, a working chamber is provided in the middle of the shell, the extruded cylindrical forming orifice plate is horizontally arranged in the middle of the working chamber, the working chamber below the extruded cylindrical forming orifice plate is a feed chamber, and the working chamber above the extruded cylindrical forming orifice plate is a cylindrical particle forming chamber, the feed pipe is connected to the bottom of the feed chamber, and the bottom of the feed pipe is a bottom feed port of the preforming device;

[0006] A dilution solvent inlet pipe and a cylindrical particle discharge pipe are provided on the side wall of the cylindrical particle forming cavity. The cutting assembly includes a rotating shaft and a cutting knife. The cutting knife is arranged on the circumference of the rotating shaft. The rotating shaft is arranged in the cylindrical particle forming cavity in a vertically rotating manner. The cutting knife is located in the cylindrical particle forming cavity and above the outlet of the forming structure.

[0007] Furthermore, the feed cavity is in the shape of a cone with a larger top and a smaller bottom, and also includes a dispersion cone, which is an inverted cone. The dispersion cone is arranged at the lower part of the extruded cylindrical forming orifice plate, and the dispersion cone is located in the middle of the feed cavity.

[0008] Furthermore, the extruded cylindrical orifice plate comprises a circular main body portion and a connecting portion, wherein the connecting portion is arranged on the outside of the circular main body portion;

[0009] All the molding structures are evenly distributed on the circular main body. The molding structure is located outside the dispersion cone. The molding structure includes a plurality of cylindrical molding holes that pass through the circular main body. The cylindrical molding holes are arranged at intervals along the radial direction of the circular main body to the outside.

[0010] Furthermore, the shell includes a main shell portion and a cover portion, and the cover portion is detachably connected and arranged above the main shell portion.

[0011] Furthermore, the lower end of the rotating shaft is rotatably connected to the extruded cylindrical molded orifice plate, the rotating shaft is rotatably connected to the cover plate portion, and the cover plate portion through which the upper end of the rotating shaft passes is provided, and the upper end of the rotating shaft is the power connection end.

[0012] Furthermore, the dilution solvent inlet pipe and the cylindrical particle discharge pipe are respectively arranged on two opposite sides of the side wall of the cylindrical particle forming cavity.

[0013] Furthermore, the shape of the preforming device is an axisymmetric figure.

[0014] The beneficial effects of the present invention are as follows: the working process of the preforming device of the present invention is as follows: the viscous nitrocellulose enters the feed cavity through the feed pipe, the viscous nitrocellulose entering the feed cavity is then formed into cylindrical rod-shaped nitrocellulose by the forming structure, the cutting component works, the rotating shaft drives the cutting knife to rotate around it, and the cutting knife cuts the cylindrical rod-shaped nitrocellulose formed by the forming structure into nitrocellulose cylindrical particles, and at the same time the dilution solvent enters the cylindrical particle forming cavity through the dilution solvent liquid inlet pipe, in the cylindrical particle forming cavity, the dilution solvent and the nitrocellulose cylindrical particles are mixed together to form a first mixed liquid, and the first mixed liquid is transported out through the cylindrical particle discharge pipe; the first mixed liquid consisting of the obtained cylindrical nitrocellulose particles and the dilution solvent enters the delivery pipe In the forming pipeline, under the action of high temperature, the cylindrical nitrocellulose particles soften in the dilute solvent aqueous phase. Under the conditions of high temperature and high pressure (temperature exceeding the boiling point of the dilute solvent), the cylindrical nitrocellulose particles take on a soft colloid-like state. Under the action of surface tension and water flow, they are reshaped into nitrocellulose spherical particles. The particle size of the nitrocellulose spherical particles is 300μm-1000μm, which are micron-level particles. Through a large amount of practice and experiments, it is concluded that the true density of the nitrocellulose spherical particles is about 1.48g / mL, and the bulk density is 1.2-1.4g / mL, which is about 10 times higher than that of flocculent nitrocellulose. It has a good bulk density, is convenient for transportation and automatic barrel emptying, and its solubility and plasticization properties are significantly improved compared to compressed nitrocellulose cotton, which is conducive to large-scale use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a flow chart of the preparation system;

[0016] Figure 2 is a schematic diagram of a preforming device;

[0017] Figure 3 is a schematic cross-sectional view of a preforming device;

[0018] Figure 4 is a schematic diagram of the main shell and components connected to the main shell;

[0019] Figure 5 is a schematic diagram of an extruded orifice plate;

[0020] Figure 6 is a schematic diagram of a molding device;

[0021] Marked as: dissolution tank 1, dilution solvent tank 2, preforming device 3, shell 31, main shell part 311, cover part 312, feed pipe 32, extrusion molding orifice plate 33, circular main body part 331, connecting part 332, molding structure 333, cylindrical molding hole 334, cutting assembly 34, rotating shaft 341, cutting knife 342, feed cavity 351, cylindrical particle molding cavity 352, dilution solvent inlet pipe 36, cylindrical particle discharge pipe 37, dispersion cone 38, molding device 4, conveying molding pipe 41, heating coil 42, thermometer 43, pressure gauge 44, insulation pipe 45, trumpet-shaped nozzle 46, desolventizing tank 5, first power pump 61, second power pump 62, third power pump 63, spherical particle hardening device 7, screening device 8. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] like Figures 1 to 6 As shown, the preparation system of nitrocellulose spherical particles includes a dissolving tank 1, a diluting solvent tank 2, a preforming device 3, a forming device 4 and a desolventizing tank 5. The discharge port of the dissolving tank 1 is connected to the bottom feed port of the preforming device 3 through a first conveying pipe, the discharge port of the diluting solvent tank 2 is connected to the diluting solvent inlet pipe 36 on the side of the preforming device 3 through a second conveying pipe, the cylindrical particle discharge pipe 37 on the side of the preforming device 3 is connected to the feed port of the forming device 4 through a third conveying pipe, and the discharge port of the forming device 4 is connected to the feed port of the desolventizing tank 5.

[0024] In order to facilitate the transportation of materials in the entire preparation system, Figure 1 As shown, a first power pump 61 is provided on the first conveying pipeline, a second power pump 62 is provided on the second conveying pipeline, and a third power pump 63 is provided on the third conveying pipeline. The first power pump 61, the second power pump 62, and the third power pump 63 are automatically controlled by a controller. The function of the first power pump 61 is to convey the material in the dissolving tank 1 to the preforming device 3, the function of the second power pump 62 is to convey the material in the dilution solvent tank 2 to the preforming device 3, and the function of the third power pump 63 is to convey the material in the preforming device 3 to the forming device 4, and to enable the material to have its forming speed in the forming device 4.

[0025] Dissolving tank 1 dissolves nitrocellulose into a viscous nitrocellulose solution using ethyl acetate or acetone as the dissolving solvent. The viscous nitrocellulose solution has a solids content of 20-35% by mass and a drop viscosity of 4-15 seconds, indicating that a 0.8 cm diameter, 60 g stainless steel rod requires 4-15 seconds to drop 6.0 cm.

[0026] The dilution solvent tank 2 stores and provides a dilution solvent, which is a solution with a solubility of less than 0.5-1.5%. The dilution solvent in the dilution solvent tank 2 is delivered to the preforming device 3 via a second power pump 62 to dilute the cylindrical nitrocellulose particles formed in the preforming device 3. The dilution solvent serves as a carrier for the cylindrical nitrocellulose particles and also for the nitrocellulose spherical particles in subsequent steps.

[0027] The function of the preforming device 3 is to shape the viscous nitrocellulose into cylindrical nitrocellulose particles and mix the cylindrical nitrocellulose particles with the diluent. A preferred structure of the preforming device 3 of the present invention is: Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the preforming device 3 includes a shell 31, a feed pipe 32, an extrusion forming orifice plate 33 and a cutting assembly 34. At least one group of forming structures 333 is provided on the extrusion forming orifice plate 33. The shell 31 is vertically arranged, and a working chamber is provided in the middle of the shell 31. The extrusion forming orifice plate 33 is horizontally arranged in the middle of the working chamber. The working chamber below the extrusion forming orifice plate 33 is a feed chamber 351, and the working chamber above the extrusion forming orifice plate 33 is a cylindrical particle forming chamber 352. The feed pipe 32 and the bottom of the feed chamber 351 are connected. The two parts are interconnected, and the bottom of the feed pipe 32 is the bottom feed port of the preforming device; the dilution solvent inlet pipe 36 and the cylindrical particle discharge pipe 37 are arranged on the side wall of the cylindrical particle forming cavity 352, and the cutting assembly 34 includes a rotating shaft 341 and a cutting knife 342, and the cutting knife 342 is arranged on the circumference of the rotating shaft 341, and the rotating shaft 341 is arranged in the cylindrical particle forming cavity 352 in a vertically rotating manner, and the cutting knife 342 is located in the cylindrical particle forming cavity 352 and above the outlet of the forming structure 333. The working process of the preforming device 3 is as follows: the discharge port of the first conveying pipe is connected to the feed pipe 32, and the viscous nitrocellulose enters the feed cavity 351 through the first conveying pipe and the feed pipe 32 in sequence. The viscous nitrocellulose entering the feed cavity 351 is then formed into cylindrical rod-shaped nitrocellulose by the molding structure 333. The cutting component 34 works, and the rotating shaft 341 drives the cutting knife 342 to rotate around it. The cutting knife 342 cuts the cylindrical rod-shaped nitrocellulose formed by the molding structure 333 into nitrocellulose cylindrical particles. The height-to-diameter ratio of the nitrocellulose cylindrical particles is 0.5-2. At the same time, the dilution solvent in the dilution solvent tank 2 enters the cylindrical particle molding cavity 352 through the second conveying pipe and the dilution solvent liquid inlet pipe 36. In the cylindrical particle molding cavity 352, the dilution solvent and the cylindrical nitrocellulose particles are mixed together to form a first mixed liquid, and the first mixed liquid is transported out through the cylindrical particle discharge pipe 37.

[0028] In order to facilitate the transportation and shaping of the viscous nitrocellulose into cylindrical nitrocellulose particles, the temperature of the viscous nitrocellulose can be heated to 80° C. for transportation and shaping.

[0029] In order to improve the forming effect of nitrocellulose cylindrical particles, the viscous nitrocellulose feed end needs to ensure its uniformity. Figure 3 As shown, the feed chamber 351 is shaped like a frustum, larger at the top and smaller at the bottom. It also includes a dispersion cone 38, which is an inverted cone. Dispersion cone 38 is positioned below the extrusion orifice plate 33 and directly in the center of the feed chamber 351. The frustum-shaped sidewalls of the feed chamber 351 and the dispersion cone 38 interact to evenly transport the viscous nitrocellulose entering the feed chamber 351 to the inlet of the extrusion orifice plate 33, improving the uniformity and quality of the cylindrical rod-shaped nitrocellulose. A more preferred arrangement for the dispersion cone 38 is one in which its bottom coincides with the centerline of the discharge port of the feed pipe 32.

[0030] In order to facilitate the installation and use of the extruded orifice plate 33, Figure 4 、 Figure 5 As shown, the extruded orifice plate 33 includes a circular main body portion 331 and a connecting portion 332. The connecting portion 332 is arranged on the outside of the circular main body portion 331. A connecting threaded hole is provided on the connecting portion 332. The extruded orifice plate 33 is detachably arranged in the working cavity of the shell 31 through a connecting bolt. This arrangement also allows the extruded orifice plate 33 to be replaced.

[0031] The molding structure 333 is a nitrocellulose that is formed into a cylindrical rod shape. In order to ensure its use effect, a preferred structure of the molding structure 333 of the utility model is: Figure 5 As shown, all the molding structures 333 are evenly distributed on the circular main body 331, and the molding structure 333 is located on the outside of the dispersion cone 38. The molding structure 333 includes a plurality of cylindrical molding holes 334 that pass through the upper and lower parts. The cylindrical molding holes 334 are vertically arranged, and the cylindrical molding holes 334 are arranged at intervals along the radial direction of the circular main body 331 to the outside.

[0032] In order to facilitate the processing of the shell 31 and the use of the shell 31, other components are arranged on the shell 31. Figure 3 As shown, the housing 31 includes a main housing portion 311 and a cover portion 312 . The cover portion 312 is detachably connected and arranged above the main housing portion 31 , and the detachable connection method is bolts.

[0033] The function of the cutting assembly 34 is to cut the cylindrical rod-shaped nitrocellulose formed by the forming structure 333 into cylindrical nitrocellulose particles. A preferred structure of the cutting assembly 34 of the present invention is: Figure 3 As shown, the lower end of the rotating shaft 341 is rotatably connected to the extruded orifice plate 33, and the rotating shaft 341 is rotatably connected to the cover portion 312. The upper end of the rotating shaft 341 passes through the cover portion 312. The upper end of the rotating shaft 341 is a power connection end, which is connected to the output shaft of the motor. More preferably, the lower end of the rotating shaft 341 is rotatably connected to the center of the extruded orifice plate 33, which effectively improves the performance of the cutting assembly 34.

[0034] In order to facilitate the entry of the dilution solvent and the delivery of the first mixed liquid of the dilution solvent and the nitrocellulose cylindrical particles, the dilution solvent inlet pipe 36 and the cylindrical particle discharge pipe 37 are respectively arranged on two opposite sides of the side wall of the cylindrical particle forming cavity 352.

[0035] In order to further improve the forming effect of the nitrocellulose cylindrical particles, the shape of the preforming device is an axisymmetric figure.

[0036] The function of the forming device 4 is to form the cylindrical nitrocellulose particles into spherical nitrocellulose particles. In order to ensure the use effect of the forming device 4, a preferred structure of the forming device 4 of the utility model is: Figure 6 As shown, the forming device 4 includes a conveying and forming pipe 41 having a circular cross-section. One end of the conveying and forming pipe 41 serves as a feed port for the forming pipe, and the other end serves as a discharge port for the forming pipe. A heating coil 42 is provided on the outer surface of the conveying and forming pipe 41, and at least one set of a thermometer 43 and a pressure gauge 44 is provided on the conveying and forming pipe 41. The heating coil 42 heats the conveying and forming pipe 41, which also increases the pressure in the conveying and forming pipe 41, causing the material in the conveying and forming pipe 41 to be exposed to high temperature and high pressure. The thermometer 43 and the pressure gauge 44 detect the temperature and pressure of each section of the conveying and forming pipe 41 to monitor whether the temperature and pressure in the conveying and forming pipe 41 meet the requirements. The working process of the molding device is as follows: a first mixed liquid consisting of cylindrical nitrocellulose particles and a diluent solvent enters the conveying and molding pipe 41 through the third conveying pipe and the molding pipe feed port. Under the action of high temperature, the cylindrical nitrocellulose particles soften in the aqueous phase of the diluent solvent. Under high temperature and high pressure (temperature exceeding the boiling point of the diluent solvent), the cylindrical nitrocellulose particles take on a soft colloid state and are reshaped into spherical nitrocellulose particles under the action of surface tension and water flow.

[0037] To ensure the effectiveness of the molding device, the molding temperature in the molding device is controlled at 50-95° C., and preferably in sections. To improve the heating effect of the heating coil 42 , the heating coil 42 is spirally wound around the outer surface of the conveying molding pipe 41 .

[0038] In order to reduce heat loss, Figure 6 As shown, the present invention is further provided with a heat preservation pipe 45 , and the conveying forming pipe 41 and the heating coil 42 are arranged inside the heat preservation pipe 45 .

[0039] In order to reduce the area occupied by the molding device and improve the molding effect of the nitrocellulose spherical particles, the conveying molding pipe 41 is arranged in a spiral from bottom to top, and the molding pipe feed port is set below the molding pipe discharge port.

[0040] To achieve segmented temperature control of the conveying and forming pipe 41 and further improve the forming effect of the forming device, three sets of thermometers 43 and pressure gauges 44 are installed on the conveying and forming pipe 41. The three sets of thermometers 43 and pressure gauges 44 are sequentially spaced along the conveying direction of the conveying and forming pipe 41. The segmented temperature control of the conveying and forming pipe 41 is: 50-60°C, 60-70°C, and 70-80°C.

[0041] In order to facilitate the transportation of the formed nitrocellulose spherical particles into the desolventizing tank 5 , the forming pipe outlet is located inside the desolventizing tank 5 , and a trumpet-shaped nozzle 46 is provided at the forming pipe outlet.

[0042] The function of the desolventizing tank 5 is to remove the desolvent. In order to ensure its use effect, the desolventizing tank 5 is preferably a flash tank. The top of the desolventizing tank 5 is provided with a gas phase discharge port, and the bottom of the desolventizing tank 5 is provided with a liquid phase discharge port.

[0043] After the flash tank treatment, the surface of the nitrocellulose spherical particles may contain a small amount of desolventizing solution. In order to further remove the desolventizing solution on the surface of the nitrocellulose spherical particles and harden the nitrocellulose spherical particles, Figure 1 As shown, the present invention is further provided with a spherical particle hardening device 7. The liquid phase discharge port of the desolventizing tank 5 is connected to the feed port of the spherical particle hardening device 7 via a fourth delivery pipe. The fourth delivery pipe is provided with a fourth power pump 64. The spherical particle hardening device 7 operates by evaporating the liquid phase with high-temperature steam. The device comprises a vertical hardening shell. High-temperature steam is added to the vertical hardening shell in sections from bottom to top, causing the temperature in the vertical hardening shell to increase from bottom to top. Under the power of the fourth power pump 64, nitrocellulose spherical particles enter the vertical hardening shell from the bottom through the fourth delivery pipe, gradually removing the desolventizing solution from the surface of the nitrocellulose spherical particles.

[0044] In order to screen out qualified nitrocellulose spherical particles, Figure 1 As shown, the present invention is further provided with a screening device 8, and the discharge port of the spherical particle hardening device 7 is connected to the feed port of the screening device 8 through a fifth conveying pipe.

[0045] A method for preparing spherical nitrocellulose particles, wherein the method adopts the above-mentioned preparation system, the particle size of the spherical nitrocellulose particles is 300 μm-1000 μm, and the method comprises the following steps:

[0046] a. After adding the dissolving solvent into the dissolving tank 1, nitrocellulose is added into the dissolving tank 1 to obtain viscous nitrocellulose;

[0047] b. Adding a dilution solvent into the dilution solvent tank 2 and conveying the dilution solvent to the preforming device 3. While the dilution solvent is being conveyed to the preforming device 3, the viscous nitrocellulose is conveyed to the preforming device 3 for preforming, thereby obtaining a first mixed solution of nitrocellulose cylindrical particles and the dilution solvent;

[0048] c. transporting the first mixed solution obtained in step b to a molding device 4 for molding to obtain a second mixed solution of nitrocellulose spherical particles and a dilution solvent;

[0049] d. The second mixed solution in step c is transported to the desolventizing tank 5 for desolventizing to obtain nitrocellulose spherical particles.

[0050] In order to improve the preparation effect of nitrocellulose spherical particles, in step a, the dissolving solvent is ethyl acetate or acetone, the solid content of the viscous nitrocellulose is 20-35% by mass percentage, and the stick drop viscosity is 4-15s;

[0051] In step b, the cross-sectional diameter of the cylindrical forming hole 334 in the preforming device 3 is 500-1500 μm, and the height-to-diameter ratio of the obtained nitrocellulose cylindrical particles is 0.5-2;

[0052] In step c, the molding temperature in the molding device 4 is controlled at 50-95°C;

[0053] The method further includes step e, wherein the nitrocellulose spherical particles obtained in step d are transported to the spherical particle hardening device 7 for further desolventizing treatment.

[0054] In summary, the preparation system and preparation method of nitrocellulose spherical particles can prepare nitrocellulose spherical particles. The particle size of the nitrocellulose spherical particles is 300μm-1000μm, which are micron-level particles. Through a large amount of practice and experiments, it is concluded that the true density of the nitrocellulose spherical particles is about 1.48g / mL, and the bulk density is 1.2-1.4g / mL, which is about 10 times higher than that of flocculent nitrocellulose. It has good bulk density, is convenient for transportation and automatic barrel emptying, and its solubility and plasticization performance is significantly improved compared with compressed nitrocellulose cotton, which is conducive to large-scale use.

Claims

1. A preforming device for spherical nitrocellulose particles, characterized by: The device comprises a shell (31), a feed pipe (32), an extrusion forming orifice plate (33) and a cutting assembly (34); at least one group of forming structures (333) is provided on the extrusion forming orifice plate (33); the shell (31) is vertically arranged; a working chamber is provided in the middle of the shell (31); the extrusion forming orifice plate (33) is horizontally arranged in the middle of the working chamber; the working chamber below the extrusion forming orifice plate (33) is a feed chamber (351); the working chamber above the extrusion forming orifice plate (33) is a cylindrical particle forming chamber (352); the feed pipe (32) is connected to the bottom of the feed chamber (351); and the bottom of the feed pipe (32) is a bottom feed port of the preforming device; A dilution solvent inlet pipe (36) and a cylindrical particle discharge pipe (37) are provided on the side wall of the cylindrical particle forming cavity (352); the cutting assembly (34) includes a rotating shaft (341) and a cutting knife (342); the cutting knife (342) is arranged on the circumference of the rotating shaft (341); the rotating shaft (341) is arranged in the cylindrical particle forming cavity (352) in a vertically rotating manner; the cutting knife (342) is located in the cylindrical particle forming cavity (352) and above the outlet of the forming structure (333).

2. The preforming device for nitrocellulose spherical particles according to claim 1, characterized in that: The feed cavity (351) is in the shape of a cone with a larger top and a smaller bottom, and further includes a dispersion cone (38). The dispersion cone (38) is in the shape of an inverted cone. The dispersion cone (38) is arranged at the lower part of the extrusion-molded orifice plate (33), and the dispersion cone (38) is located in the middle of the feed cavity (351).

3. The preforming device for spherical nitrocellulose particles according to claim 2, characterized in that: The extruded orifice plate (33) comprises a circular main body (331) and a connecting portion (332), wherein the connecting portion (332) is arranged outside the circular main body (331); All the molding structures (333) are evenly distributed on the circular main body (331). The molding structure (333) is located outside the dispersion cone (38). The molding structure (333) includes a plurality of cylindrical molding holes (334) that pass through the circular main body (331). The cylindrical molding holes (334) are arranged at intervals along the radial direction of the circular main body (331) to the outside.

4. The preforming device for nitrocellulose spherical particles according to claim 1, characterized in that: The housing (31) comprises a main housing portion (311) and a cover portion (312), wherein the cover portion (312) is detachably connected and arranged above the main housing portion (311).

5. The preforming device for nitrocellulose spherical particles according to claim 4, characterized in that: The lower end of the rotating shaft (341) is rotatably connected to the extruded orifice plate (33), the rotating shaft (341) is rotatably connected to the cover plate portion (312), and the upper end of the rotating shaft (341) passes through the cover plate portion (312), and the upper end of the rotating shaft (341) is a power connection end.

6. The preforming device for nitrocellulose spherical particles according to claim 1, characterized in that: The dilution solvent inlet pipe (36) and the cylindrical particle discharge pipe (37) are respectively arranged on two opposite sides of the side wall of the cylindrical particle forming cavity (352).

7. The preforming device for nitrocellulose spherical particles according to any one of claims 1 to 6, characterized in that: The shape of the preforming device is an axisymmetric figure.

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