A continuous preparation device and process for nitroguanidine

Abstract

The application discloses a kind of nitro guanidine continuity preparation device and process, the bottom end inner wall of the pretreatment mechanism is connected with waste outlet, and first solenoid valve is arranged on waste outlet, and the bottom end of pretreatment mechanism is provided with mixing mechanism, and the bottom end outer wall of mixing mechanism is fixed with underframe;The mixing mechanism includes mixing bin, and the inner wall of one side of mixing bin is closely connected with second conveying pipe, and the top inner wall of second conveying pipe is connected with powder storage bin by first conveying pipe, and one end of second conveying pipe is closely connected with air blower, and the inner wall of mixing bin is provided with baffle above second conveying pipe, and frequency adjusting mechanism is simultaneously provided on second conveying pipe and first conveying pipe;The top inner wall center position of the mixing bin is provided with movable connecting piece, and the nitro guanidine continuity preparation device and process disclosed in the application can better realize the continuity preparation of nitro guanidine and effectively improve the preparation efficiency.

Description

Technical Field

[0001] This invention relates to the field of nitroguanidine preparation technology, and in particular to a continuous preparation apparatus and process for nitroguanidine. Background Technology

[0002] Nitroguanidine is an organic compound with the chemical formula CH4N4O2. It is a white crystalline powder that is soluble in hot water, insoluble in cold water, slightly soluble in ethanol, insoluble in ether, and readily soluble in alkaline solutions. It is commonly used as a raw material for explosives and organic synthesis.

[0003] The main raw materials for nitroguanidine include sodium nitrite, urea, benzaldehyde, sodium hydroxide, and nitric acid. Sodium nitrite and urea are the primary raw materials for nitroguanidine; benzaldehyde is the oxidant, sodium hydroxide is the neutralizing agent, and nitric acid is the catalyst. In the preparation process, sodium nitrite needs to be fully dissolved in water before being mixed with the other raw materials. Preparation is generally completed by sequential placement and multiple stirrings in the same container. Because powder may adhere to the container, it needs to be cleaned during the preparation process. This is not conducive to the continuous preparation of nitroguanidine and affects production efficiency. Summary of the Invention

[0004] This invention discloses a continuous preparation apparatus and process for nitroguanidine, aiming to solve the technical problem that hinders the continuous preparation of nitroguanidine and affects production efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A continuous preparation apparatus for nitroguanidine includes a pretreatment mechanism. A waste discharge port is connected to the inner wall of the bottom end of the pretreatment mechanism, and a first solenoid valve is installed on the waste discharge port. A mixing mechanism is located at the bottom end of the pretreatment mechanism, and a base frame is fixed to the outer wall of the bottom end of the mixing mechanism. The mixing mechanism includes a mixing chamber, and a second conveying pipe is tightly connected to one inner wall of the mixing chamber. A powder storage chamber is connected to the inner wall of the top end of the second conveying pipe via a first conveying pipe. A blower is tightly connected to one end of the second conveying pipe. A baffle is installed on the inner wall of the mixing chamber above the second conveying pipe. Frequency converters are simultaneously installed on both the second and first conveying pipes. Adjustment mechanism; a movable connector is provided at the center of the top inner wall of the mixing chamber, and the movable connector is connected to the pretreatment mechanism. A diversion pipe is tightly connected to the bottom inner wall of the movable connector, and a third driving mechanism is provided on the outer wall of the diversion pipe. The third driving mechanism is used to drive the diversion pipe to rotate. A second turntable is movably connected to the bottom inner wall of the mixing chamber, and multiple stirring rods are fixedly connected to the top of the second turntable. A second driving mechanism is provided at the bottom of the second turntable, and the second driving mechanism is used to drive the second turntable to rotate. A discharge port is fixedly connected at the center of the bottom of the second turntable, and a third solenoid valve is provided on the discharge port.

[0007] By incorporating a mixing mechanism, the mixed liquid in the pretreatment unit enters the mixing chamber through a diversion pipe, allowing the liquid to flow down the inner wall of the mixing chamber. Simultaneously, the mixed powder raw material in the powder storage chamber is sprayed into the mixing chamber by the force of a blower, ensuring thorough contact with the liquid flowing down the inner wall of the mixing chamber. Finally, the powder reaches the bottom of the mixing chamber, where it is thoroughly stirred by a rotating second disc and a stirring rod. This structure avoids the agglomeration caused by a large amount of powder directly contacting the liquid. Furthermore, the overall mixing efficiency of nitroguanidine is effectively improved through dispersion mixing. In addition, by switching the liquid's flow path through a first solenoid valve, the pretreatment unit can be cleaned and wastewater discharged during the stirring process of the second disc. Thus, continuous preparation of nitroguanidine can be achieved more effectively, and the preparation efficiency can be significantly improved.

[0008] In a preferred embodiment, the frequency adjustment mechanism includes a third connecting frame, with a blower fixed to the top of the third connecting frame. A second metal filter is fixedly connected to the inner wall of one end of the second conveying pipe, and a first sliding groove is fixedly connected to the middle section of the second conveying pipe. A first limiting groove is provided through the inner walls of the opposite sides of the first sliding groove. A first sliding plate is movably connected within the first sliding groove, and a first connecting frame is fixedly connected to both sides of the first sliding plate, with the first connecting frame passing through the first limiting groove. A second sliding groove is fixedly connected to the middle section of the first conveying pipe, and a second limiting groove is provided through both ends of the second sliding groove. A second sliding plate is movably connected within the second sliding groove, and a second connecting frame is fixedly connected to both sides of the second sliding plate, with the second connecting frame passing through the second limiting groove. A base plate is fixedly connected to the bottom ends of both the second and first connecting frames, and a nut slider is fixedly connected to the outer wall of the bottom end of the base plate. A reciprocating slide rail is movably connected within the nut slider, and the reciprocating slide rail is fixed to the third connecting frame.

[0009] With a frequency adjustment mechanism, the reciprocating motion of the nut slider on the reciprocating slide rail simultaneously drives the first and second slide plates to move within the first and second sliding grooves respectively, thereby regularly switching the closed mode of the first and second conveying pipes. Under this structure, the quantitative powder injection can further optimize the mixing effect between the powder and the mixed liquid. At the same time, under the action of the second metal filter, the powder can be cut during the injection process, further preventing clumping.

[0010] In a preferred embodiment, the pretreatment mechanism includes a pretreatment chamber, with a diversion port fixedly connected to the inner wall of the top of the pretreatment chamber. A buffer connecting frame is provided in the diversion port, and a central upright is fixedly connected to the outer wall of the bottom of the diversion port. A vibrator is provided inside the central upright. Multiple fan blades are fixedly connected to the outer wall of the central upright at equal density, and multiple impact blocks are fixedly connected to the outer wall of the multiple fan blades on the same side. Multiple first metal filters are fixedly connected to the outer walls of the multiple fan blades and the central upright, and the outer walls of the multiple first metal filters are attached to the inner wall of the pretreatment chamber. A first turntable is movably connected to the inner wall of the pretreatment chamber, and the first turntable is located below the first metal filters. Multiple stirring protrusions are fixedly connected to the outer wall of the top of the first turntable, and a liquid passage pipe is fixedly connected to the center of the first turntable. The bottom end of the liquid passage pipe is connected to a movable connecting piece, and a second solenoid valve is provided on the liquid passage pipe. A first driving mechanism is provided at the bottom of the first turntable, and the first driving mechanism is used to drive the first turntable to rotate.

[0011] A continuous preparation process for nitroguanidine includes the following specific steps:

[0012] S1: Sodium nitrite and water are added sequentially through the diversion port, and the two are mixed in the pretreatment chamber for later use;

[0013] S2: Mix the remaining powdered raw materials and place them in the powder storage silo for later use;

[0014] S3: The mixture of sodium nitrite and water is diverted through a diversion pipe so that it flows down the inner wall of the mixing chamber when it enters the mixing chamber;

[0015] S4: The powder in the powder storage bin is affected by the air force of the blower, and when it enters the mixing bin, it comes into full contact with the mixed liquid flowing on its inner wall. During the process, the frequency adjustment mechanism adjusts the blower frequency at the same time.

[0016] S5: The second turntable rotates, driving further mixing. At the same time, the second solenoid valve closes and the first solenoid valve opens to clean the pretreatment chamber.

[0017] S6: Discharge the mixture for dehydration, and then mix the raw materials again.

[0018] With a pretreatment mechanism, sodium nitrite is first added through the diversion port. The powder is further crushed and layered by the impact block and the first metal filter. Then water is added, and the water washes off the adhering sodium nitrite by rinsing the fan blades and impact block. The vibration of the vibrator and the stirring protrusion on the rotating first disc drive the water flow to accelerate the mixing of the two. With this structure, only the powder and water need to be added in sequence to complete the rapid mixing, so that it can be used immediately. While avoiding powder adhesion and waste through in-situ rinsing, it also facilitates subsequent rinsing and cleaning.

[0019] As described above, a continuous nitroguanidine preparation apparatus includes a pretreatment mechanism. The bottom inner wall of the pretreatment mechanism is connected to a waste discharge port, and a first solenoid valve is installed on the waste discharge port. A mixing mechanism is installed at the bottom of the pretreatment mechanism, and a base frame is fixed to the bottom outer wall of the mixing mechanism. The mixing mechanism includes a mixing chamber, and a second conveying pipe is tightly connected to one side inner wall of the mixing chamber. The top inner wall of the second conveying pipe is connected to a powder storage chamber via a first conveying pipe, and a blower is tightly connected to one end of the second conveying pipe. A baffle is installed on the inner wall of the mixing chamber above the second conveying pipe, and both the second and first conveying pipes are equipped with... A frequency adjustment mechanism is included. A movable connector is located at the center of the inner top wall of the mixing chamber, and this connector is connected to the pretreatment mechanism. A diversion pipe is tightly connected to the inner bottom wall of the movable connector, and a third driving mechanism is located on the outer wall of the diversion pipe, which drives the diversion pipe to rotate. A second turntable is movably connected to the inner bottom wall of the mixing chamber, and multiple stirring rods are fixedly connected to the top of the second turntable. A second driving mechanism is located at the bottom of the second turntable, which drives the second turntable to rotate. A discharge port is fixedly connected to the center of the bottom of the second turntable, and a third solenoid valve is installed on the discharge port. The nitroguanidine continuous preparation apparatus and process provided by this invention have the technical effect of better realizing the continuous preparation of nitroguanidine and effectively improving the preparation efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a continuous nitroguanidine preparation device proposed in this invention.

[0021] Figure 2 This is a schematic diagram of the internal structure of a continuous nitroguanidine preparation device proposed in this invention.

[0022] Figure 3 This is a schematic diagram showing the disassembled structure of the pretreatment mechanism of a continuous nitroguanidine preparation apparatus proposed in this invention.

[0023] Figure 4 This is a schematic diagram showing the bottom connection structure of the pretreatment mechanism in a continuous nitroguanidine preparation apparatus proposed in this invention.

[0024] Figure 5 This is a schematic diagram showing the disassembled structure of the frequency adjustment mechanism of a continuous nitroguanidine preparation device proposed in this invention.

[0025] Figure 6 This is a detailed flow chart of a continuous preparation apparatus and process for nitroguanidine proposed in this invention.

[0026] In the diagram: 1. Pretreatment mechanism; 2. Waste discharge port; 3. Mixing mechanism; 4. Base frame; 5. Frequency adjustment mechanism; 6. First solenoid valve; 101. Diverter port; 102. Pretreatment chamber; 103. Buffer connecting frame; 104. Central upright; 105. Impact block; 106. Fan blade; 107. Vibrator; 108. First metal filter screen; 109. Stirring protrusion; 110. First turntable; 111. Second solenoid valve; 112. Liquid passage pipe; 113. First drive mechanism; 301. Mixing chamber; 302. Powder storage chamber; 303. First conveying pipe; 304. Blower; 305. Second conveying pipe; 306, second drive mechanism; 307, discharge port; 308, second turntable; 309, stirring rod; 310, baffle; 311, diverting pipe; 312, movable connecting piece; 313, third drive mechanism; 501, first sliding groove; 502, first limiting groove; 503, second sliding groove; 504, second limiting groove; 505, second metal filter; 506, second sliding plate; 507, second connecting frame; 508, base plate; 509, nut slider; 510, reciprocating slide rail; 511, third connecting frame; 512, first connecting frame; 513, first sliding plate. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0028] The nitroguanidine continuous preparation apparatus and process disclosed in this invention are mainly applied to the continuous preparation of nitroguanidine.

[0029] Reference Figures 1-4A continuous preparation apparatus for nitroguanidine includes a pretreatment mechanism 1. A waste outlet 2 is connected to the inner wall of the bottom end of the pretreatment mechanism 1, and a first solenoid valve 6 is installed on the waste outlet 2. A mixing mechanism 3 is installed at the bottom end of the pretreatment mechanism 1, and a base frame 4 is fixed to the outer wall of the bottom end of the mixing mechanism 3. The mixing mechanism 3 includes a mixing chamber 301, and a second conveying pipe 305 is tightly connected to one inner wall of the mixing chamber 301. A powder storage chamber 302 is connected to the inner wall of the top end of the second conveying pipe 305 via a first conveying pipe 303. A blower 304 is tightly connected to one end of the second conveying pipe 305. A baffle 310 is installed on the inner wall of the mixing chamber 301 above the second conveying pipe 305. Frequency adjustment mechanisms 5 are simultaneously provided on pipes 305 and 303; a movable connector 312 is provided at the center of the inner top wall of mixing chamber 301, and the movable connector 312 is connected to the pretreatment mechanism 1. A diversion pipe 311 is tightly connected to the inner bottom wall of the movable connector 312, and a third drive mechanism 313 is provided on the outer wall of the diversion pipe 311. The third drive mechanism 313 is used to drive the diversion pipe 311 to rotate; a second turntable 308 is movably connected to the inner bottom wall of mixing chamber 301, and multiple stirring rods 309 are fixedly connected to the top of the second turntable 308. A second drive mechanism 306 is provided at the bottom of the second turntable 308, and the second drive mechanism 306 is used to drive... The second turntable 308 rotates, and a discharge port 307 is fixedly connected to the center of its bottom end. A third solenoid valve is installed on the discharge port 307. The pretreatment mechanism 1 is used to mix sodium nitrite and water, and the mixing mechanism 3 is used to mix the mixture in the pretreatment mechanism 1 as well as powdered raw materials such as urea, benzaldehyde, sodium hydroxide, and nitric acid. The mixed liquid in the pretreatment mechanism 1 enters the mixing chamber 301 through the diversion pipe 311, and under the action of the third drive mechanism 313, the diversion pipe 311 is driven to rotate, causing the liquid to rotate and spray onto the inner wall of the mixing chamber 301. At the same time, the mixed powdered raw materials in the powder storage chamber 302 enter the second conveying pipe 305, and are blown by the blower 304. The force drives the powder in the second conveying pipe 305 to be sprayed into the mixing chamber 301, where it comes into full contact with the liquid flowing down the inner wall of the mixing chamber 301. Finally, the powder reaches the bottom of the mixing chamber 301 and is thoroughly stirred by the rotating second turntable 308 and stirring rod 309. This structure can avoid the agglomeration caused by a large amount of powder directly contacting the liquid. At the same time, the overall mixing efficiency of nitroguanidine can be effectively improved by dispersing and mixing. Meanwhile, the first solenoid valve 6 switches the flow path of the liquid, and the pretreatment mechanism 1 can be cleaned and wastewater discharged during the stirring process of the second turntable 308. Thus, the continuous preparation of nitroguanidine can be better realized and the preparation efficiency can be effectively improved.

[0030] Reference Figure 5In a preferred embodiment, the frequency adjustment mechanism 5 includes a third connecting frame 511, and the blower 304 is fixed to the top of the third connecting frame 511. A second metal filter 505 is fixedly connected to the inner wall of one end of the second conveying pipe 305, and a first sliding groove 501 is fixedly connected to the middle section of the second conveying pipe 305. A first limiting groove 502 is provided through the inner walls of the opposite sides of the first sliding groove 501.

[0031] Reference Figure 5 In a preferred embodiment, a first sliding plate 513 is movably connected within the first sliding groove 501, and a first connecting frame 512 is fixedly connected to both sides of the first sliding plate 513, the first connecting frame 512 passing through the first limiting groove 502; a second sliding groove 503 is fixedly connected to the middle section of the first conveying pipe 303, and a second limiting groove 504 is provided through both ends of the second sliding groove 503; a second sliding plate 506 is movably connected within the second sliding groove 503, and a second connecting frame 507 is fixedly connected to both sides of the second sliding plate 506, the second connecting frame 507 passing through the second limiting groove 504.

[0032] Reference Figure 5 In a preferred embodiment, the bottom ends of the second connecting frame 507 and the first connecting frame 512 are simultaneously fixedly connected to a base plate 508, and a nut slider 509 is fixedly connected to the outer wall of the bottom end of the base plate 508. A reciprocating slide rail 510 is movably connected inside the nut slider 509, and the reciprocating slide rail 510 is fixed on the third connecting frame 511. As the nut slider 509 reciprocates on the reciprocating slide rail 510, it can simultaneously drive the first slide plate 513 and the second slide plate 506 to move in the first sliding groove 501 and the second sliding groove 503 respectively, thereby regularly switching the closed mode of the first conveying pipe 303 and the second conveying pipe 305. Thus, it is possible to realize two states: batch spraying of powder raw materials and the blower 304 being in a closed state during the falling of raw materials, allowing the raw materials to fall fully. Under this structure, the quantitative powder spraying can further optimize the mixing effect between powder and mixed liquid. At the same time, under the action of the second metal filter 505, the powder can be cut during the spraying process, further avoiding the occurrence of clumping.

[0033] Reference Figure 3 and Figure 4 In a preferred embodiment, the pretreatment mechanism 1 includes a pretreatment chamber 102, and a diversion port 101 is fixedly connected to the inner wall of the top of the pretreatment chamber 102. A buffer connecting frame 103 is provided in the diversion port 101, and a central upright 104 is fixedly connected to the outer wall of the bottom of the diversion port 101. A vibrator 107 is provided inside the central upright 104.

[0034] Reference Figure 3 and Figure 4In a preferred embodiment, a plurality of fan blades 106 are fixedly connected to the outer wall of the central upright 104 at equal density, and a plurality of impact blocks 105 are fixedly connected to the outer wall of the plurality of fan blades 106 on the same side. A plurality of first metal filters 108 are fixedly connected to the outer wall of the plurality of fan blades 106 and the central upright 104, and the outer wall of the plurality of first metal filters 108 is attached to the inner wall of the pretreatment chamber 102.

[0035] Reference Figure 3 and Figure 4 In a preferred embodiment, the inner wall of the pretreatment chamber 102 is movably connected to a first turntable 110, and the first turntable 110 is located below the first metal filter screen 108. A plurality of stirring protrusions 109 are fixedly connected to the top outer wall of the first turntable 110, and a liquid passage pipe 112 is fixedly connected to the center of the first turntable 110.

[0036] Reference Figure 3 and Figure 4 In a preferred embodiment, the bottom end of the liquid-passing pipe 112 is connected to the movable connector 312, and a second solenoid valve 111 is provided on the liquid-passing pipe 112. A first drive mechanism 113 is provided at the bottom end of the first turntable 110, and the first drive mechanism 113 is used to drive the first turntable 110 to rotate. The pretreatment mechanism 1 is used to mix sodium nitrite and water. Since sodium nitrite is easily soluble in water, the two can be fully dissolved by vibration stirring. Sodium nitrite is first added through the diversion port 101. The powder can be further crushed by the impact block 105. When it falls onto the multiple first metal filter screens 108, the first metal filter screens 108... The wider diameter of the holes in part 8 allows for the layering of large amounts of sodium nitrite powder, preventing it from accumulating at the bottom of the pretreatment chamber 102. Water is then added, and the water washes off the adhering sodium nitrite by rinsing the fan blades 106 and the impact block 105. The vibration of the vibrator 107 and the stirring protrusions 109 on the rotating first turntable 110 accelerate the mixing of the two by driving the water flow. The multiple fan blades 106 increase the vibration transmission area. With this structure, powder and water can be added sequentially to achieve rapid mixing, making it ready to use immediately. In-situ rinsing avoids powder adhesion and waste, and also facilitates subsequent rinsing and cleaning.

[0037] Reference Figure 6 A continuous preparation process for nitroguanidine should include the following specific steps:

[0038] S1: Sodium nitrite and water are added sequentially through the diversion port 101, and the two are mixed in the pretreatment chamber 102 for later use.

[0039] S2: Mix the remaining powdered raw materials and place them in the powder storage silo 302 for later use;

[0040] S3: The mixture of sodium nitrite and water is diverted through the diversion pipe 311 so that it flows down the inner wall of the mixing chamber 301 when it enters the mixing chamber 301;

[0041] S4: The powder in the powder storage bin 302 is affected by the wind force of the blower 304. When it enters the mixing bin 301, it comes into full contact with the mixed liquid flowing on its inner wall. During the process, the frequency adjustment mechanism 5 adjusts the blower frequency at the same time.

[0042] S5: The second turntable 308 rotates, driving further mixing. At the same time, the second solenoid valve 111 closes and the first solenoid valve 6 opens to clean the pretreatment chamber 102.

[0043] S6: Discharge the mixture for dehydration, and then mix the raw materials again.

[0044] Working principle: The pretreatment unit 1 is used to mix sodium nitrite and water. Since sodium nitrite is easily soluble in water, the two can be fully dissolved by vibration and stirring. First, sodium nitrite is added through the diversion port 101. The powder can be further broken down by the impact block 105. When it falls onto the multiple first metal filter screens 108, the large diameter of the holes in the first metal filter screens 108 can separate a large amount of sodium nitrite powder into layers, preventing the sodium nitrite from accumulating at the bottom of the pretreatment chamber 102. Then, water is added. The water washes off the adhering sodium nitrite by rinsing the fan blades 106 and the impact block 105. The vibration of the vibrator 107 and the stirring protrusions 1 on the rotating first turntable 110 further contribute to the process. 09 drives the water flow to accelerate the mixing of the two, with multiple fan blades 106 increasing the vibration transmission area. With this structure, only sequential addition of powder and water is needed to complete rapid mixing, achieving immediate use. In-situ rinsing avoids powder adhesion and waste, while also facilitating subsequent rinsing and cleaning. As the mixed liquid in the pretreatment mechanism 1 enters the mixing chamber 301 through the diversion pipe 311, the diversion pipe 311 rotates under the action of the third drive mechanism 313, causing the liquid to rotate and spray onto the inner wall of the mixing chamber 301. Simultaneously, the mixed powdered raw material in the powder storage chamber 302 enters the second conveying pipe 305, which is driven by the air force of the blower 304. The powder is sprayed into the mixing chamber 301 and comes into full contact with the liquid flowing down the inner wall of the mixing chamber 301. Finally, it reaches the bottom of the mixing chamber 301 and is thoroughly stirred by the rotating second disc 308 and stirring rod 309. This structure avoids the agglomeration caused by a large amount of powder directly contacting the liquid. Simultaneously, the overall mixing efficiency of nitroguanidine is effectively improved through dispersion mixing. Furthermore, the first solenoid valve 6 switches the liquid's flow path, and during the stirring process of the second disc 308, the pretreatment mechanism 1 can be cleaned and wastewater discharged. Therefore, continuous preparation of nitroguanidine can be better achieved and the preparation efficiency can be effectively improved. During the powder spraying process, as... The reciprocating motion of the nut slider 509 on the reciprocating slide rail 510 can simultaneously drive the first slide plate 513 and the second slide plate 506 to move in the first sliding groove 501 and the second sliding groove 503 respectively, thereby regularly switching the closed mode of the first conveying pipe 303 and the second conveying pipe 305. Thus, it is possible to realize two modes: batch spraying of powder raw materials and the blower 304 being in a closed state during the material falling process, allowing the material to fall fully. Under this structure, the quantitative powder spraying can further optimize the mixing effect between powder and mixed liquid. At the same time, under the action of the second metal filter 505, the powder can be cut during the spraying process, further preventing the occurrence of agglomeration.

[0045] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A continuous preparation apparatus for nitroguanidine, comprising a pretreatment unit (1), characterized in that, The bottom inner wall of the pretreatment mechanism (1) is connected to a waste discharge port (2), and a first solenoid valve (6) is provided on the waste discharge port (2). The bottom end of the pretreatment mechanism (1) is provided with a mixing mechanism (3), and a base frame (4) is fixed on the bottom outer wall of the mixing mechanism (3). The mixing mechanism (3) includes a mixing chamber (301), and a second conveying pipe (305) is tightly connected to one side of the inner wall of the mixing chamber (301). The top inner wall of the second conveying pipe (305) is connected to a powder storage chamber (302) through a first conveying pipe (303). A blower (304) is tightly connected to one end of the second conveying pipe (305). A baffle (310) is provided on the inner wall of the mixing chamber (301) above the second conveying pipe (305). A frequency adjustment mechanism (5) is provided on both the second conveying pipe (305) and the first conveying pipe (303). A movable connector (312) is provided at the center of the inner wall of the top of the mixing chamber (301), and the movable connector (312) is connected to the pretreatment mechanism (1). A diversion pipe (311) is tightly connected to the inner wall of the bottom end of the movable connector (312), and a third driving mechanism (313) is provided on the outer wall of the diversion pipe (311). The third driving mechanism (313) is used to drive the diversion pipe (311) to rotate. The mixing chamber (301) is movably connected to the inner wall of the bottom end of a second turntable (308), and a plurality of stirring rods (309) are fixedly connected to the top end of the second turntable (308). A second driving mechanism (306) is provided at the bottom end of the second turntable (308), and the second driving mechanism (306) is used to drive the second turntable (308) to rotate. A discharge port (307) is fixedly connected to the center position of the bottom end of the second turntable (308), and a third solenoid valve is provided on the discharge port (307). The pretreatment mechanism (1) includes a pretreatment chamber (102), and a diversion port (101) is fixedly connected to the inner wall of the top of the pretreatment chamber (102). A buffer connecting frame (103) is provided in the diversion port (101), and a central upright (104) is fixedly connected to the outer wall of the bottom of the diversion port (101). A vibrator (107) is provided in the central upright (104). Multiple fan blades (106) are fixedly connected to the outer wall of the central upright (104) at equal density, and multiple impact blocks (105) are fixedly connected to the outer wall of the multiple fan blades (106) on the same side. Multiple first metal filters (108) are fixedly connected to the outer walls of the multiple fan blades (106) and the central upright (104), and the outer walls of the multiple first metal filters (108) are attached to the inner wall of the pretreatment chamber (102). The inner wall of the pretreatment chamber (102) is movably connected to a first turntable (110), and the first turntable (110) is located below the first metal filter (108). Multiple stirring protrusions (109) are fixedly connected to the top outer wall of the first turntable (110), and a liquid passage pipe (112) is fixedly connected to the center of the first turntable (110). The bottom end of the liquid passage pipe (112) is connected to the movable connector (312), and a second solenoid valve (111) is provided on the liquid passage pipe (112). A first drive mechanism (113) is provided at the bottom end of the first turntable (110), and the first drive mechanism (113) is used to drive the first turntable (110) to rotate.

2. The continuous preparation apparatus for nitroguanidine according to claim 1, characterized in that, The frequency adjustment mechanism (5) includes a third connecting frame (511), and a blower (304) is fixed to the top of the third connecting frame (511). A second metal filter (505) is fixedly connected to the inner wall of one end of the second conveying pipe (305), and a first sliding groove (501) is fixedly connected to the middle section of the second conveying pipe (305). A first limiting groove (502) is provided through the inner walls of the opposite sides of the first sliding groove (501).

3. The continuous preparation apparatus for nitroguanidine according to claim 2, characterized in that, The first sliding groove (501) is movably connected to the first sliding plate (513), and the first connecting frame (512) is fixedly connected to both sides of the first sliding plate (513). The first connecting frame (512) passes through the first limiting groove (502). The middle section of the first conveying pipe (303) is fixedly connected to a second sliding groove (503), and the two ends of the second sliding groove (503) are provided with second limiting grooves (504). The second sliding groove (503) is movably connected to a second sliding plate (506), and the two sides of the second sliding plate (506) are fixedly connected to a second connecting frame (507). The second connecting frame (507) passes through the second limiting groove (504).

4. The continuous preparation apparatus for nitroguanidine according to claim 3, characterized in that, The bottom ends of the second connecting frame (507) and the first connecting frame (512) are simultaneously fixedly connected to a base plate (508), and a nut slider (509) is fixedly connected to the outer wall of the bottom end of the base plate (508). A reciprocating slide rail (510) is movably connected inside the nut slider (509), and the reciprocating slide rail (510) is fixed on the third connecting frame (511).

5. A continuous preparation process for nitroguanidine, applied to the continuous preparation apparatus for nitroguanidine as described in claim 4, characterized in that, The specific steps include the following: S1: Sodium nitrite and water are added sequentially through the diversion port (101), and the two are mixed in the pretreatment chamber (102) for later use; S2: Mix the remaining powdered raw materials and place them in the powder storage silo (302) for later use; S3: The mixture of sodium nitrite and water is diverted through the diversion pipe (311) so that it flows down the inner wall of the mixing chamber (301) when it enters the mixing chamber (301); S4: The powder in the powder storage bin (302) is affected by the wind force of the blower (304) and makes full contact with the mixed liquid flowing on its inner wall when it enters the mixing bin (301). During the process, the frequency adjustment mechanism (5) adjusts the blower frequency at the same time. S5: The second turntable (308) rotates, driving further mixing, while the second solenoid valve (111) closes and the first solenoid valve (6) opens to clean the pretreatment chamber (102); S6: Discharge the mixture for dehydration, and then mix the raw materials again.

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