Firework inner tube charge production line

Abstract

The application discloses a firework inner tube charging production line, and belongs to the technical field of firework production equipment. First, firework inner tube cakes are conveyed to a first powder filling device, and a reducing agent required for forming a priming agent is filled into each inner tube of the firework inner tube cakes according to a preset amount. The firework inner tube cakes filled with the reducing agent are conveyed to a second powder filling device, an oxidizing agent required for forming the priming agent is filled into each inner tube of the firework inner tube cakes according to a preset amount, and the firework inner tube cakes filled with the oxidizing agent are conveyed to a first medicine mixing device. The reducing agent and the oxidizing agent in each inner tube of the firework inner tube cakes are uniformly mixed to form the priming agent. After the mixing is completed, the firework inner tube cakes are conveyed to a bright bead filling device, and bright beads required are filled into each inner tube of the firework inner tube cakes according to a preset amount. After the filling is completed, the firework inner tube cakes are conveyed to a second medicine mixing device, and the priming agent powder and the bright beads in each inner tube of the firework inner tube cakes are uniformly mixed.

Description

Technical Field

[0001] This invention belongs to the field of fireworks production equipment technology, specifically a fireworks inner tube filling production line. Background Technology

[0002] Fireworks are a comprehensive art product that uses gunpowder as its core raw material and produces visual and auditory effects such as sound, light, color, and shape through combustion or explosion.

[0003] The key to fireworks production is filling the pyrotechnic powder into the inner tubes of the fireworks' inner cylinder according to a preset ratio. Current production processes typically involve first mixing the reducing agent, oxidizing agent, and bright beads (which create various color effects) required for the opening of the fireworks' inner cylinders using a pyrotechnic powder mixing device. This mixture is then conveyed to a filling device and filled into the inner cylinders of the fireworks' inner cylinders according to a preset amount. A single batch of pyrotechnic powder can usually fill several inner cylinders, meaning a relatively large batch. Furthermore, the mixing of reducing and oxidizing agents creates the potential for an explosion. Therefore, large-scale mixing before filling poses a significant safety risk. Moreover, mixing before filling can lead to significant differences in the uniformity of the pyrotechnic powder in each inner cylinder, resulting in large ratio deviations and high uncontrollability of quality. Summary of the Invention

[0004] The purpose of this invention is to provide a fireworks inner tube filling production line to solve at least one of the problems mentioned in the background art.

[0005] This invention provides a fireworks inner tube filling production line, comprising: The first powder filling device 4 fills the reducing agent required to form the opening powder of the firework inner tube into each inner tube of the firework inner tube paper cake according to the preset amount; The second powder filling device 7 fills the oxidant required to form the opening charge of the firework inner tube into each inner tube of the firework inner tube paper cake according to the preset amount; The first mixing device 8 mixes the reducing agent and oxidizing agent in each inner tube of the firework inner tube paper cake evenly to form the opening agent; The bright bead filling device 10 fills each inner tube of the firework inner tube paper cake with the bright beads required to form the firework inner tube effect parts according to a preset amount. The second mixing device 11 mixes the opening powder and bright beads in each inner tube of the firework inner tube paper cake evenly; The conveying device transports the inner tube paper cake of the fireworks to or from the first powder filling device 4, the second powder filling device 7, the first mixing device 8, the bright bead filling device 10, and the second mixing device 11.

[0006] As a further embodiment of the present invention: the first powder filling device 4 includes a filling platform 41 and a rotary lifting device 42. The filling platform 41 includes a frame 4112, on which a second mounting plate 4113 is mounted. A through hole is provided in the center of the second mounting plate 4113, and the rotary lifting device 42 is provided below the through hole. A powder guide 4110 is provided on the second mounting plate 4113 at the position corresponding to the through hole. A fourth valve 4115 is provided on the powder guide 4110. A metering plate 4114 is mounted on the fourth valve 4115. A fifth support plate 417 is mounted on the metering plate 4114. The fifth support plate 417 has a central portion... The device has several powder passage holes 4171. The fifth support plate 417 is equipped with a movable powder box 413 and a spatula 414. The spatula 414 has four sides that cooperate to form a closed rectangle. The outlet of the powder box 413 is located inside the closed rectangle. The metering plate 4114 has several metering channels that correspond one-to-one with the powder passage holes 4171. The side of each metering channel near the fourth valve 4115 is connected to the valve core 41151 of the fourth valve 4115. The powder guide 4110 has several powder guiding channels 41102 that correspond one-to-one with the powder passage holes 4171. The other end of the valve core 41151 is connected to the corresponding powder guiding channel 41102.

[0007] As a further aspect of the present invention: a first powder mixing device 3 is provided above the first powder filling device 4. The first powder mixing device 3 includes a support 36, a second hopper 32 installed on the support 36, and a mixer 31 located directly below the second hopper 32. The mixer 31 is installed on the support 36 via a second rotary cylinder 35. The mixer 31 includes a mixing component 313, with a first transition hopper 312 and a second transition hopper 315 connected to its two ends respectively. The first transition hopper 312 is connected to a second valve 3. 11. The other end of the second valve 311 is directly opposite the outlet of the second hopper 32. The second transition hopper 315 is connected to the third valve 316. The other end of the third valve 316 is connected to the first powder filling device 4. The mixing component 313 has a mixing channel inside. The mixing channel is connected to the internal cavity of the first transition hopper 312 and the second transition hopper 315. The flow channel of the second valve 311 is connected to the internal cavity of the first transition hopper 312. The flow channel of the third valve 316 is connected to the internal cavity of the second transition hopper 315.

[0008] As a further aspect of the present invention: the mixing component 313 has an axially penetrating cavity inside, and a left-handed plate 3131 and a right-handed plate 3132 are sequentially connected along the axial direction inside the cavity, so that a mixing channel is formed inside the cavity.

[0009] As a further aspect of the present invention: a first powder screw conveyor 2 is provided next to the first powder filling device 4. The first powder screw conveyor 2 includes a third conveying device 22, a feeding device 21 provided at the feeding end of the third conveying device 22, and a metering device 23 provided at the discharging end of the third conveying device 22. The feeding device 21 includes a feeding bin 211. The bottom of the feeding bin 211 is provided with a first hopper 215 that connects the feeding bin 211 and the interior of the third conveying device 22. The bottom of the feeding bin 211 is a spherical cavity, and the upper part is a funnel-shaped cavity.

[0010] As a further embodiment of the present invention: the metering device 23 includes a second support plate 232, a third support plate 239, a connector 231, and a metering pipe 236. A leveling device is movably provided between the second support plate 232 and the third support plate 239. A first mounting hole is provided in the middle of the second support plate 232, and the connector 231, which communicates with the third conveying device 22, is installed in the first mounting hole. A second mounting hole is provided in the third support plate 239, and the top of the metering pipe 236 is fixedly installed in the second mounting hole. A first valve 237 is installed at the bottom of the 36, and the scraping device has a material passage hole with a connecting joint 231 and a metering pipe 236; the scraping device includes a box body 234, the top of the box body 234 is an open structure, the bottom is provided with a scraper 235, the scraper 235 has a material passage hole, the bottom of the joint 231 extends into the box body 234, and a first rodless cylinder 233 is provided on both sides of the box body 234. The first rodless cylinder 233 is supported on the third support plate 239, and the bottom of the first valve 237 is provided with a discharge pipe 238.

[0011] As a further aspect of the present invention: the first mixing device 8 includes a rotary device 83 and a mixing device frame 82 fixed to the drive end of the rotary device 83. A plurality of rotary swing cylinders 84 are evenly distributed around the outer periphery of the mixing device frame 82. A mixing box 81 is installed at the drive end of the rotary swing cylinders 84. The mixing box 81 includes a box body 811. A feed inlet is provided on the side of the box body 811 away from the mixing device frame 82. A cover plate 815 and a push plate 817 are movably installed inside the box body 811. The cover plate 815 is located above the push plate 817. A material support plate 818 is provided at the bottom inner side of the box body 811.

[0012] As a further aspect of the present invention: the conveying device includes a straight conveying device and a corner conveying device 1, the corner conveying device 1 comprising: The first conveying device 102 and the second conveying device 103 are arranged at an angle to each other; The indexing device 101 is arranged at the intersection of the extension lines of the first conveying device 102 and the second conveying device 103. The indexing device 101 includes a first push cylinder 1014 and a first rotary cylinder 1017. The output shaft of the first rotary cylinder 1017 is fixedly connected to an indexing plate 1016, and the telescopic rod of the first push cylinder 1014 is connected to a first push fork 1015. The indexing plate 1016 is used to receive the material conveyed by the second conveying device 103 and adjust the direction of the material; The first push fork 1015 is used to push the material on the indexing plate 1016 onto the first conveying device 102.

[0013] As a further aspect of the present invention: the second conveying device 103 is provided with a booster device at one end near the indexing device 101. The booster device includes a gantry frame 1031, a support base 1032 is provided on the top of the gantry frame 1031, and a first lifting cylinder 1033 is provided on the side of the support base 1032 facing the indexing device 101. The end of the telescopic cylinder of the first lifting cylinder 1033 is connected to a second pushing cylinder 1034, and the end of the telescopic cylinder of the second pushing cylinder 1034 is connected to a second push fork 1035.

[0014] As a further aspect of the present invention: the bright beads required to form the inner tube effect component of the fireworks are transported to the bright bead filling device 10 by a negative pressure elevator 9.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention first loads the reducing agent required to form the opening powder of the fireworks inner tube into each inner tube of the fireworks inner tube paper cake according to a preset amount. Then, the oxidizing agent required to form the opening powder is loaded into each inner tube of the fireworks inner tube paper cake according to a preset amount. The reducing agent and oxidizing agent in each inner tube of the fireworks inner tube paper cake are then mixed evenly to form the opening powder. Next, the bright beads required to form the effect parts of the fireworks inner tube are loaded into each inner tube of the fireworks inner tube paper cake according to a preset amount. The opening powder and bright beads in each inner tube of the fireworks inner tube paper cake are then mixed evenly. The mixing of the oxidizing and reducing agents takes place within the inner tube of the fireworks inner tube paper cake, mixing only the amount of one fireworks inner tube paper cake at a time, and dispersing the mixture in each inner tube, significantly improving the safety of fireworks production. Furthermore, loading before mixing helps control the accuracy of the proportions and ensures better uniformity of the pyrotechnics in each inner tube, improving product quality.

[0016] 2. The volume from the powder passage hole to the bottom of the powder guiding channel is the volume of powder required to fill each inner cylinder of the fireworks inner tube paper cake. The inner tube paper cake is aligned correctly with the powder guide device using a rotating lifting device. Before feeding the powder box, the fourth valve is closed. During the back-and-forth movement of the powder box and the spatula, the powder is smeared through the powder passage hole into the metering channel. Once the passage hole is full and leveled, the valve is opened, and the powder from the metering channel falls into the inner cylinder of the fireworks inner tube paper cake through the powder guiding channel, completing the filling of the reducing agent or oxidizing agent into the fireworks inner tube paper cake. The filling device has a simple structure and can fill one fireworks inner tube paper cake at a time, improving filling efficiency. Metering through the metering channel prevents overfilling or underfilling.

[0017] 3. During the mixing process, both the third and second valves are closed. The mixer is driven to rotate 180° by the second rotary cylinder, pauses briefly, then rotates 180° again and pauses briefly, and so on. During the rotation of the mixer, the powder flows downward under its own gravity, passing through the mixing channel and forming a three-dimensional dispersion effect through layering, cutting, shearing, and deflection. This process is repeated several times to achieve good dispersion and thorough mixing of the powder. The mixing device is driven by pneumatic pressure, eliminating induced electromotive force and electrostatic voltage, thus improving safety.

[0018] 4. The bottom of the feed hopper is a spherical cavity with smooth inner walls and no dead corners, preventing material from accumulating on the walls. Material within the spherical cavity can diffuse outwards under its own gravity, concentrating at the bottom before entering the third conveying device. This results in a smoother flow path and stronger anti-clogging capabilities. The discharge port of the third conveying device is equipped with a metering device. A metering pipe with appropriate volume is selected. The first valve is closed for feeding and metering. Excess powder exceeding the metering pipe's capacity is scraped off by a scraper. The first valve is then opened to discharge the powder to the next process. At this point, the volume of the powder is equal to the volume of the metering pipe. Therefore, quantitative feeding can be achieved simply by selecting the appropriate metering pipe based on the powder addition amount.

[0019] 5. The indexing device receives the material conveyed by the second conveying device and adjusts the direction of the material. The first push fork pushes the material on the indexing plate onto the first conveying device, realizing the corner transportation of the material and offsetting the main shaft direction of the two adjacent process equipment, thereby reducing the harm of explosion accidents. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar or repeated elements are not repeatedly labeled. The elements or parts in the drawings are not necessarily drawn to scale.

[0021] Figure 1This is a schematic diagram of a preferred embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the corner conveying device in a preferred embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the transposition device in a preferred embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the structure of the first powder screw conveyor in a preferred embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the feeding device in a preferred embodiment of the present invention.

[0026] Figure 6 This is a schematic diagram of the metering device in a preferred embodiment of the present invention.

[0027] Figure 7 This is a schematic diagram of the structure of the first powder mixing device in a preferred embodiment of the present invention.

[0028] Figure 8 This is a schematic diagram of the mixer in a preferred embodiment of the present invention.

[0029] Figure 9 This is a schematic diagram of the internal structure of the hybrid component in a preferred embodiment of the present invention.

[0030] Figure 10 This is a schematic diagram of the structure of the first powder filling device in a preferred embodiment of the present invention.

[0031] Figure 11 This is a schematic diagram of the filling stage in a preferred embodiment of the present invention.

[0032] Figure 12 This is a schematic diagram of the filling stage from another perspective in a preferred embodiment of the present invention.

[0033] Figure 13 This is a schematic diagram of a portion of the structure of the filling platform in a preferred embodiment of the present invention.

[0034] Figure 14 This is a schematic diagram of the internal structure of the valve in a preferred embodiment of the present invention.

[0035] Figure 15 This is a schematic diagram of the powder guide in a preferred embodiment of the present invention.

[0036] Figure 16 This is a schematic diagram of the rotating lifting device in a preferred embodiment of the present invention.

[0037] Figure 17This is a schematic diagram of the structure of the first drug mixing device in a preferred embodiment of the present invention.

[0038] Figure 18 This is a schematic diagram of the mixing tank in a preferred embodiment of the present invention.

[0039] Figure 19 This is a schematic diagram of the structure of the mixing device frame in a preferred embodiment of the present invention.

[0040] In the diagram: 1. Corner conveyor; 101. Indexing device; 1011. Support leg; 1012. First support plate; 1013. Support frame; 1014. First pushing cylinder; 1015. First push fork; 1016. Indexing plate; 10161. Step; 1017. First rotary cylinder; 102. First conveying device; 103. Second conveying device; 1031. Gantry frame; 1032. Support base; 1033. First lifting cylinder; 1034. Second pushing cylinder; 1035. Second push fork; 2. First powder screw conveyor; 21. Feeding device; 211. Feed hopper; 212. Bearing seat; 213. Stirring shaft; 214. Arch breaking device; 215. First hopper; 216. First vibrating device; 22 221. Third conveying device; 222. Screw conveying pipe; 223. Conveying motor; 224. Discharge pipe; 235. Metering device; 236. Connector; 237. Second support plate; 238. First rodless cylinder; 239. Box body; 230. Scraper; 231. Metering pipe; 232. First valve; 233. Discharge pipe; 234. Third support plate; 25. Screw conveyor frame; 26. First powder mixing device; 31. Mixer; 311. Second valve; 312. First transition hopper; 313. Mixing component; 3131. Left-hand rotating plate; 3132. Right-hand rotating plate; 314. Connector; 315. Second transition hopper; 316. Third valve; 317. Second vibration device; 32. Second hopper; 33. Lifting frame; 34. Telescopic cylinder; 35. Second rotary cylinder; 36. Support; 4. First powder filling device; 41. Filling platform; 411. Third hopper; 412. Material box; 413. Powder box; 414. Spare shovel; 415. Pressing strip; 416. Fourth support plate; 417. Fifth support plate; 4171. Powder passage hole; 418. Second rodless cylinder; 419. First mounting plate; 4110. Powder guide; 41101. Connecting part; 41102. Powder guiding channel; 4111. Third vibration device; 4112. Stand; 4113. Second mounting plate; 4114. Metering plate; 4115. Fourth valve; 41151. Valve core; 41152. Press nozzle; 41153. Retaining ring; 42. Rotary lifting device; 421. Positioning rod; 422, Transition plate; 423, Sixth support plate; 4231, Positioning frame; 424, Third rotary cylinder; 425, Seventh support plate; 426, Lifting cylinder; 427, Eighth support plate; 431, Third mounting plate; 432, Third pushing cylinder; 433, Third push fork; 434, Height adjusting cylinder; 5, Second powder screw conveyor; 6, Second powder mixing device; 7, Second powder filling device; 8, First mixing device; 81, Mixing box; 811, Box body; 812, Support; 814, Second lifting cylinder; 815, Cover plate; 816, Third rodless cylinder; 817, Push plate; 818, Material support plate; 82, Mixing device frame; 821, Turntable; 822, Pad; 823, Support column;824. Connecting plate; 825. Support frame; 83. Rotary device; 84. Rotary swing cylinder; 9. Negative pressure elevator; 10. Bright bead filling device; 11. Second mixing device. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0043] The terms "first," "second," and similar words used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "above," "below," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, this relative positional relationship may also change accordingly.

[0044] In this disclosure, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0045] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0046] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0047] Please see Figure 1 As shown, this embodiment provides a fireworks inner tube filling production line, including: The first powder filling device 4 fills the reducing agent required to form the opening powder of the firework inner tube into each inner tube of the firework inner tube paper cake according to the preset amount; The second powder filling device 7 fills the oxidant required to form the opening charge of the firework inner tube into each inner tube of the firework inner tube paper cake according to the preset amount; The first mixing device 8 mixes the reducing agent and oxidizing agent in each inner tube of the firework inner tube paper cake evenly to form the opening agent; The bright bead filling device 10 fills each inner tube of the firework inner tube paper cake with the bright beads required to form the firework inner tube effect parts according to a preset amount. The second mixing device 11 mixes the opening powder and bright beads in each inner tube of the firework inner tube paper cake evenly; The conveying device transports the inner tube paper cake of the fireworks to or from the first powder filling device 4, the second powder filling device 7, the first mixing device 8, the bright bead filling device 10, and the second mixing device 11.

[0048] In this invention, the inner tube paper cake of the fireworks is first conveyed to the first powder filling device 4 via a conveying device. The first powder filling device 4 fills the reducing agent required to form the opening charge of the fireworks inner tube into each inner tube of the inner tube paper cake according to a preset amount. The inner tube paper cake filled with reducing agent is then conveyed to the second powder filling device 7 via a conveying device. The second powder filling device 7 fills the oxidizing agent required to form the opening charge of the fireworks inner tube into each inner tube of the inner tube paper cake according to a preset amount. The inner tube paper cake filled with oxidizing agent is then conveyed to the first mixing device 8 via a conveying device. The first mixing device 8 then mixes the reducing agent and oxidizing agent in each inner tube of the inner tube paper cake evenly to form the opening charge. After mixing, the firework inner tube paper cake is conveyed to the bright bead filling device 10 via a conveying device. The bright bead filling device 10 fills the inner tubes of the firework inner tube with the required bright beads to form the firework inner tube effect components according to a preset amount. After filling, the firework inner tube paper cake is conveyed to the second mixing device 11 via a conveying device. The second mixing device 11 mixes the opening powder and bright beads in each inner tube of the firework inner tube paper cake evenly. After mixing, subsequent processes such as filling with isolation material and sealing the bottom can be performed. These processes are existing technologies, and this invention does not improve the equipment used for filling with isolation material and sealing the bottom, so they will not be described in detail. The mixing of the oxidizer and reducing agent takes place within the inner tube of the firework inner tube paper cake, mixing only the amount of one firework inner tube paper cake at a time, and dispersing the mixture in each inner tube, significantly improving the safety of firework production. Furthermore, filling before mixing helps control the accuracy of the proportions and ensures better uniformity of the pyrotechnics in each inner tube, improving product quality.

[0049] In some embodiments, a first powder screw conveyor 2 is provided next to the first powder filling device 4. (See also...) Figures 4-6 As shown, the first powder screw conveyor 2 includes a third conveying device 22, a feeding device 21 disposed at the feeding end of the third conveying device 22, and a metering device 23 disposed at the discharging end of the third conveying device 22. The feeding device 21 includes a feeding bin 211. The bottom of the feeding bin 211 is provided with a first hopper 215 that connects the feeding bin 211 and the interior of the third conveying device 22. The bottom of the feeding bin 211 is a spherical cavity, and the upper part is a funnel-shaped cavity.

[0050] In this embodiment, three sets of first powder screw conveyors 2 are provided to convey three different reducing agent powders respectively. A third conveying device 22 is fixed to the ground via a screw conveyor frame 24. The third conveying device 22 is installed at a preset angle and fixed to the screw conveyor frame 24 by pipe clamps. The lower end of the screw conveyor frame 24 is the feed end, and a feed hopper 211 is fixedly installed on the screw conveyor frame 24. The feed hopper 211 includes a funnel-shaped cavity at the top, a straight tube cavity in the middle, and a spherical cavity at the bottom. The feed hopper 211 is made of stainless steel or galvanized steel, and the inner wall surface is machined to a mirror finish to avoid the accumulation of static electricity from friction. The reducing agent powder is poured into the feed hopper 211, and then enters the feed inlet of the third conveying device 22 through the first hopper 215, and is conveyed upwards by the third conveying device 22. The bottom of the feeding hopper 211 is a spherical cavity with smooth inner walls and no dead corners, so materials are not easy to accumulate on the wall surface. The materials in the spherical cavity can diffuse to the surroundings by their own gravity and concentrate at the bottom to enter the third conveying device 22, making the flow path smoother and the anti-blocking ability strong.

[0051] Preferably, a bearing seat 212 is fixed to the outer wall of the feed hopper 211. A through-hole is provided in the wall of the feed hopper 211 corresponding to the central hole of the bearing seat 212. A stirring shaft 213 passing through the through-hole is fitted into the central hole of the bearing seat 212. An arch-breaking device 214 is installed at one end of the stirring shaft 213, and the other end is connected to a stirring drive device (not shown in the figure). Sealing gaskets are fitted on both sides of the through-hole of the stirring shaft 213. The sealing gaskets are preferably made of chemically resistant materials such as nitrile rubber or fluororubber. The stirring shaft 213 and the arch-breaking device 214 are made of stainless steel or galvanized steel with a smooth surface finish. The stirring drive device is preferably a rotary cylinder, but a geared motor can also be used. The motor must be an explosion-proof motor of ExdIIBT1 level or higher. The anti-bridging device 214 prevents the powder on the surface of the first hopper 215 from agglomerating due to prolonged contact with air. The anti-bridging device 214 rotates at 29-40 rpm, avoiding both excessively low speeds that could affect material feeding and excessively high speeds that could "throw up" the powdered reducing agent, forming high-concentration dust. It also prevents static electricity buildup caused by friction between powder particles. A first vibration device 216 is also installed on the outer wall of the first hopper 215 to further prevent material bridging and optimize material distribution. The first vibration device 216 is preferably an air hammer. Preferably, the third conveying device 22 includes a spiral conveying pipe 221, within which a spiral conveying shaft is installed. One end of the spiral conveying shaft is connected to a conveying motor 222. The spiral conveying pipe 221 has a feed inlet at its inlet end and a discharge outlet at its outlet end. The interior of the first hopper 215 is connected to the interior of the spiral conveying pipe 221 through the feed inlet. The spiral conveying pipe 221 and the spiral conveying shaft are made of 304 stainless steel or galvanized steel. The inner wall of the spiral conveying pipe 221 and the edge of the spiral conveying shaft must be polished smooth. The spiral conveying pipe 221 must be properly sealed to prevent powder leakage. The conveying motor 222 must be an explosion-proof motor of ExdIIBT1 level or above. The spiral rotation speed must be controlled at 8-15 r / min to avoid intense friction and heat generation between the reducing agent powder and the spiral conveying pipe 221 and the spiral conveying shaft.

[0052] Furthermore, the outlet of the spiral conveying pipe 221 is connected to a discharge pipe 223, and the other end of the discharge pipe 223 is connected to a metering device 23. The discharge pipe 223 is made of 304 stainless steel or galvanized steel, and its inner wall is polished.

[0053] Preferably, the metering device 23 includes a second support plate 232, a third support plate 239, a connector 231, and a metering pipe 236. A scraping device is movably provided between the second support plate 232 and the third support plate 239. The second support plate 232 has a first mounting hole in its middle, and the connector 231, which communicates with the discharge pipe 223, is installed in the first mounting hole. The third support plate 239 has a second mounting hole, and the top of the metering pipe 236 is fixedly installed in the second mounting hole. A first valve 237 is installed at the bottom of the metering pipe 236. The leveling device has a material passage hole for connecting the connector 231 and the metering pipe 236; the leveling device includes a box body 234, the top of the box body 234 is an open structure, the bottom is provided with a scraper 235, the scraper 235 has a material passage hole, the bottom of the connector 231 extends into the box body 234, and a first rodless cylinder 233 is provided on both sides of the box body 234. The first rodless cylinder 233 is supported on a third support plate 239, the bottom surface of the scraper 235 is in contact with the third support plate 239, and the top surface of the scraper 235 is in contact with the bottom of the connector 231. The two sides of the box body 234 are connected to the movable ends of the first rodless cylinder 233. The scraper 235 is located between the bottom of the connector 231 and the third support plate 239. The top dimension of the box body 234 is larger than the outer diameter of the connector 231. The connector 231 is fixed to the bottom of the feed pipe 223. The first rodless cylinder 233 can drive the box body 234 to move horizontally. When the outlet of the connector 231 corresponds to the material passage hole of the scraper 235 and the inlet of the metering pipe 236, the powder can be transported into the metering pipe 236 through the third conveying device 22. When the scraper 235 moves between the connector 231 and the metering pipe 236, it isolates the outlet of the connector 231 from the inlet of the metering pipe 236. The scraper 235 can also scrape the powder at the inlet of the metering pipe 236 to ensure that the powder in the metering pipe 236 does not exceed its volume, thereby improving the accuracy of metering. The first valve 237 has a discharge pipe 238 at its bottom, through which powder is introduced into the first powder mixing device 3. The box body 234 and the discharge pipe 238 are made of 304 stainless steel or galvanized steel and are polished.

[0054] The third support plate 239 is mounted on the ground via a base frame (not shown). The base frame is existing technology and is used to fix and support the third support plate 239. The connector 231, metering pipe 236, and third support plate 239 are made of 304 stainless steel or galvanized steel and are polished. The metering pipe 236, the third support plate 239, and the first valve 237 are detachably installed for easy replacement of the metering pipe 236. The first valve 237 is a pneumatic clamp valve. A metering device 23 is installed at the outlet of the third conveying device 22. A metering pipe 236 with a suitable volume is selected. The first valve 237 is closed for feeding and metering. The scraping device scrapes off the excess powder exceeding the volume of the metering pipe 236. Then, the first valve 237 is opened to discharge the powder into the first powder mixing device 3. At this time, the volume of the powder is equal to the volume of the metering pipe 236. Therefore, quantitative feeding can be achieved by selecting the appropriate metering pipe 236 according to the amount of powder added.

[0055] Furthermore, the side wall of the connector 231 is provided with a tuning fork switch, the fork of the tuning fork switch extends into the connector 231, and the side wall of the connector 231 where the tuning fork switch is installed is sealed. The tuning fork switch is existing technology, and its structure and working principle will not be described in detail.

[0056] The pneumatic devices described in this application, such as the first vibration device 216, the stirring drive device, the first rodless cylinder 233, and the first valve 237, are all connected to an air source via air ducts. Each air duct is equipped with a solenoid valve between itself and the air source. Each solenoid valve, tuning fork switch, and conveyor motor 222 is connected to a control system and controlled by the control system. The control system and its control principle are existing technologies and will not be described in detail here. To avoid safety hazards caused by the solenoid valves and control system, the control system, air source, and solenoid valves can be installed outside the safety door of the production workshop.

[0057] When the fork of the tuning fork switch comes into contact with the powder, the changes in vibration frequency and amplitude are converted into a switching signal by the intelligent circuit and sent to the control system. The control system then controls the conveyor motor 222 to shut down, preventing the continuous feeding of powder to the connector 231 when the first valve 237 is closed.

[0058] To reduce safety risks, the first powder screw conveyor 2 is equipped with an anti-static grounding device with a grounding resistance of ≤10Ω. The effectiveness of the grounding is tested regularly to prevent static electricity buildup caused by friction between the material and the conveying device, which could lead to sparks.

[0059] In this embodiment, the oxidant comprises two different powders, therefore, the second powder screw conveyor 5 is provided in two sets. The structure of the second powder screw conveyor 5 is similar to that of the first powder screw conveyor 2, except that the second powder screw conveyor 5, which conveys the oxidant, does not have an arch-breaking device 214 and a first vibration device 216. This is because the oxidant, unlike sulfur in the reducing agent, does not have strong hygroscopicity and is less prone to agglomeration. Therefore, the arch-breaking device 214 and the first vibration device 216 are not necessary in the second powder screw conveyor 5, but they can be provided if necessary.

[0060] Work process reference: First, install a metering pipe 236 with a volume equal to the preset powder quantity. Close the first valve 237 and align the outlet of the connector 231 with the material passage hole of the scraper 235 and the inlet of the metering pipe 236. Open the three types of packaged powder and add them to the three feed hoppers 211 respectively. Start the stirring drive device, the conveying motor 222 and the first vibration device 216 to drive the arch-breaking device 214 to stir the powder. The powder enters the spiral conveying pipe 221 through the first hopper 215 and is conveyed to the outlet. After discharge, Pipe 223 enters connector 231, and then enters metering pipe 236. When the control system receives a signal from the tuning fork switch, it shuts off the conveying motor 222 and starts the first rodless cylinder 233, causing the scraper 235 to move between connector 231 and metering pipe 236, isolating the outlet of connector 231 from the inlet of metering pipe 236. The scraper 235 can also level the powder at the inlet of metering pipe 236. Then, the first valve 237 is opened, and a preset amount of powder enters the first powder mixing device 3. After the powder is discharged from metering pipe 236, the first valve 237 is closed again, the first rodless cylinder 233 is started, causing the scraper 235 to move out of the inlet of metering pipe 236, and the conveying motor 222 is started to start the next round of powder conveying and metering.

[0061] In some embodiments, please refer to Figures 7-9As shown, the first powder mixing device 3 includes a support 36, a second hopper 32 mounted on the support 36, and a mixer 31 located directly below the second hopper 32. The end of the discharge pipe 238 extends into the second hopper 32. The mixer 31 is mounted on the support 36 via a second rotary cylinder 35. The mixer 31 includes a mixing component 313, with a first transition hopper 312 and a second transition hopper 315 connected to its two ends respectively. The first transition hopper 312 is connected to a second valve 311. The other end of the door 311 is directly opposite the outlet of the second hopper 32. The second transition hopper 315 is connected to the third valve 316. The other end of the third valve 316 is connected to the powder box 413. The mixing component 313 has a mixing channel inside. The mixing channel is connected to the internal cavity of the first transition hopper 312 and the second transition hopper 315. The flow channel of the second valve 311 is connected to the internal cavity of the first transition hopper 312. The flow channel of the third valve 316 is connected to the internal cavity of the second transition hopper 315.

[0062] During feeding and discharging, the mixer 31 is placed vertically, with one port of the second valve 311 or the third valve 316 facing the outlet of the second hopper 32. At this time, the port of the second valve 311 or the third valve 316 facing the outlet of the second hopper 32 is connected to the outside, serving as the inlet and outlet for the powder entering and exiting the mixer 31. For example, the powder is first fed through the second valve 311 to the second hopper 32. Then, the third valve 316 is closed, the second valve 311 is opened, and the three sets of first valves 237 are opened. The three sets of three reducing agent powder raw materials in a preset ratio are conveyed into the second hopper 32 through the three sets of discharge pipes 238. The powder in the second hopper 32 enters the second transition hopper 315 through the second valve 311, the first transition hopper 312, and the mixer 313. It should be noted that the total volume of all powder raw materials does not exceed two-thirds of the volume of the mixing component 313, and is less than the volume of the first transition hopper 312 and the second transition hopper 315. Preferably, the volume of the first transition hopper 312 and the second transition hopper 315 is less than two-thirds of the volume of the mixing component 313. Close the second valve 311, start the second rotary cylinder 35, and drive the mixer 31 to rotate 180°. Pause briefly, and wait for the powder to fall from the second transition hopper 315 into the first transition hopper 312 through the mixing component 313 under the action of gravity. The powder will be mixed during the falling process, thereby creating a good radial mixing effect. Repeating the mixing several times will improve the effect. For example, it can be repeated 2-4 times or 6-8 times. After thorough mixing, the powder is discharged into the first powder filling device 4 through the lower valve. After the discharge is completed, the lower valve is closed, while the upper valve remains open. The telescopic rod of the telescopic cylinder 34 is retracted, causing the lifting frame 33 to descend and connect with the upper valve for refeeding.

[0063] Furthermore, before opening the lower valve to discharge material, the upper valve can be opened first to vent air, so as to avoid the air pressure inside the mixer 31 being lower than the external air pressure, which would cause poor material discharge.

[0064] The mixer 31 and the second hopper 32 are made of stainless steel, galvanized steel, antistatic plastic, or antistatic rubber, and are properly grounded. The inner walls of the first transition hopper 312, the mixer 313, and the second transition hopper 315 are smooth to reduce friction. The first powder mixing device 3 is pneumatically driven, eliminating induced electromotive force and electrostatic voltage, thus improving safety. Furthermore, the small mixing volume at a time helps prevent major safety accidents.

[0065] Furthermore, the second valve 311 and the third valve 316 are pneumatic pinch valves, which are valves powered by compressed air and achieve fluid flow control by squeezing or releasing an elastic valve sleeve. They feature full-bore operation, no dead zone, and anti-clogging characteristics. An elastic sealing ring is provided on the bottom outer wall of the second hopper 32. The elastic sealing ring is an inverted frustum-shaped cone with a lower outer diameter smaller than its upper outer diameter. The bottom outer diameter of the elastic sealing ring is smaller than the inner diameter of the external connection port of the second valve 311 and the third valve 316, while the top outer diameter is larger than the inner diameter of the external connection port of the second valve 311 and the third valve 316. When the second hopper 32 descends to connect with the second valve 311 and the third valve 316 for feeding, the bottom of the second hopper 32 extends into the elastic valve sleeve of the second valve 311 and the third valve 316. At this time, the elastic sealing ring is located between the outer wall of the second hopper 32 and the elastic valve sleeve, forming a seal to prevent dust from being emitted. Both the elastic valve sleeve and the elastic sealing ring are made of anti-static material.

[0066] Furthermore, the mixing component 313 has an axially penetrating cavity inside, and a left-handed plate 3131 and a right-handed plate 3132 are arranged sequentially along the axial direction inside the cavity. The sides connecting the left-handed plate 3131 and the right-handed plate 3132 are arranged at an angle, so that a mixing channel is formed inside the cavity.

[0067] Please see Figure 9As shown, the mixing component 313 contains two left-handed rotating plates 3131 and one right-handed rotating plate 3132. The powder flows through the mixing channel, sometimes rotating left and sometimes right, constantly changing its flow direction. This not only pushes the central powder towards the periphery but also pushes the peripheral powder towards the center, creating a three-dimensional dispersion effect through layering, shearing, and deflection. The number of left-handed and right-handed rotating plates 3131 and 3132 can be adjusted according to actual needs, with at least one left-handed plate 3131 and one right-handed plate 3132. Properly configuring the length and inner diameter of the mixing component 313, as well as the shape of the left-handed and right-handed rotating plates 3131 and 3132, can keep the powder flow velocity within the mixing component 313 below 3 m / s, avoiding static electricity accumulation. The left-handed and right-handed rotating plates 3131 and 3132 are made of stainless steel or galvanized steel, with a smooth, burr-free surface finish.

[0068] Preferably, the left-hand rotating plate 3131 and the right-hand rotating plate 3132 have equal torsional angles, which can effectively ensure the powder cutting effect of the left-hand rotating plate 3131 and the right-hand rotating plate 3132, guide the powder, and improve the powder mixing effect by alternating the left-hand rotating plate 3131 and the right-hand rotating plate 3132.

[0069] Furthermore, the torsion angles of the left-hand rotating plate 3131 and the right-hand rotating plate 3132 are 90° to 180°, which improves the cutting effect on the powder.

[0070] Furthermore, the first transition hopper 312 and / or the second transition hopper 315 includes an expanding section, a straight section, and a contracting section, with the two ends of the straight section connected to the large opening end of the expanding section and the large opening end of the contracting section, respectively. Powder enters the first transition hopper 312 and / or the second transition hopper 315 from the small opening end of the expanding section or the contracting section, where it accumulates and slides. When the mixer 31 rotates, the powder can be tilted and mixed in the first transition hopper 312 and / or the second transition hopper 315, and then enters the mixing element 313 through the small opening end of the expanding section or the contracting section for further mixing. This changes the flow sequence of the powder, improves mixing efficiency, ensures smooth flow of powder from the first transition hopper 312 and / or the second transition hopper 315 to the mixing element 313, and improves mixing uniformity. The small opening end of the expanding section is provided with a first flange, and the small opening end of the contracting section is provided with a second flange.

[0071] Furthermore, the second hopper 32 is mounted on the bracket 36 via a lifting device, which includes a lifting frame 33 and a telescopic cylinder 34. The cylinder body of the telescopic cylinder 34 is mounted on the bracket 36, and the telescopic rod of the telescopic cylinder 34 is connected to the lifting frame 33. The lifting frame 33 also has an assembly hole for mounting the second hopper 32. The telescopic cylinder 34 can drive the lifting frame 33 to move up and down, thereby driving the second hopper 32 to move up and down. The second hopper 32 descends to connect with the second valve 311 or the third valve 316 to discharge powder, preventing powder overflow. The second hopper 32 rises to avoid affecting the rotation of the mixer 31, and at the same time, the second hopper 32 rises to approach the discharge pipe 238 to receive powder.

[0072] Furthermore, the bottom of the lifting frame 33 is provided with an ear plate, and a baffle is provided on the side of the ear plate away from the lifting frame 33. The telescopic rod of the telescopic cylinder 34 passes through the baffle and is connected to the ear plate. The cylinder body of the telescopic cylinder 34 has a guide channel parallel to the telescopic rod of the telescopic cylinder 34, and a guide rod is provided on the baffle and installed in the guide channel. The telescopic cylinder 34 drives the lifting frame 33 to move up and down, and is guided by the guide rod to prevent the telescopic rod of the telescopic cylinder 34 from wobbling when it extends, which would cause the second hopper 32 to shift laterally and prevent the second hopper 32 from failing to accurately connect with the second valve 311.

[0073] Furthermore, the outer wall of the mixing component 313 is provided with a second vibration device 317, which is preferably an air hammer. The air hammer generates an impact force by periodically releasing compressed air, which acts on the outer wall of the mixing component 313 to shake off the residual material attached to the wall surface, preventing the material from caking and blocking the mixing channel. At the same time, it can "loosen" some of the material, helping it to flow more smoothly in the mixing channel, and indirectly improving the mixing uniformity.

[0074] Furthermore, the cylinder body of the second rotary cylinder 35 is fixedly installed on the bracket 36, and the output shaft end of the second rotary cylinder 35 is connected to a connecting frame. The outer wall of the mixer 31 is provided with a connecting member 314. Specifically, the connecting member 314 is provided on the outer wall of the mixer 313. The connecting member 314 is detachably connected to the connecting frame. For example, the detachable connection can be a bolt connection, a snap-fit ​​connection, or a flange connection. When the connecting member 314 is connected to the connecting frame, the connecting member 314 and the connecting frame are relatively fixedly connected.

[0075] Flanges can be installed at both ends of the second valve 311, the first transition hopper 312, the mixing component 313, the second transition hopper 315, and the third valve 316 for connection.

[0076] The second valve 311, the third valve 316, the telescopic cylinder 34, the second rotary cylinder 35, and the air hammer are all connected to an air source via air ducts. Each air duct is connected to the air source via a solenoid valve, and each solenoid valve is connected to a control system for control. The control system and its operating principle are existing technology and will not be elaborated upon here. To avoid safety hazards posed by the solenoid valves and control system, the control system, air source, and solenoid valves can be installed outside the safety door of the production workshop.

[0077] Working process: Taking the second valve 311 as the first feeder, the telescopic cylinder 34 is controlled to retract, causing the lifting frame 33 to descend. At this time, the second hopper 32 connects to the external port of the second valve 311, opening the second valve 311 and closing the third valve 316. Pre-proportioned amounts of powdered raw materials are then fed into the second hopper 32 through three sets of discharge pipes 238. The reducing agent powder in the second hopper 32 passes through the second valve 311, the first transition hopper 312, and the mixing component 313 into the second transition hopper 315. After feeding is complete, the second valve 311 is closed, and the telescopic cylinder 34 is activated to extend the telescopic rod, causing the lifting frame 33 to rise. At this point, there is a distance between the second hopper 32 and the second valve 311. The second rotary cylinder 35 is activated, causing the mixer 31 to rotate 180°. After a brief pause, the powder is allowed to fall from the second transition hopper 315 through the mixing component 313 into the first transition hopper 312 under gravity. The powder mixes as it falls; repeating this process several times improves the mixing effect. Once the powder is fully mixed, the second valve 311 is turned downwards as the discharge port. The third valve 316 is opened to vent air; it does not need to be fully opened, just slightly open to allow venting. After venting, it is closed again. Then, the second valve 311 is opened again to discharge the reducing agent powder into the first powder loading device 4. After this discharge, the second rotary cylinder 35 is activated, rotating the mixer 31 180° so that the port of the second valve 311 connecting to the outside is directly below the outlet of the second hopper 32, allowing for re-feeding. The first powder mixing device 3 mixes only the amount of reducing agent for one firework inner tube at a time, which is safer than mixing large quantities of pyrotechnic powder at once.

[0078] The first powder mixing device 3 can be used not only for mixing reducing agents in pyrotechnics, but also for mixing various other powder materials such as oxidizers. Therefore, the second powder mixing device 6 has the same structure as the first powder mixing device 3.

[0079] In some embodiments, please refer to Figures 10-16As shown, the first powder filling device 4 includes a filling platform 41 and a rotary lifting device 42. The filling platform 41 includes a frame 4112, on which a second mounting plate 4113 is mounted. A through hole is opened in the center of the second mounting plate 4113, and the rotary lifting device 42 is located below the through hole. A powder guide 4110 is located on the second mounting plate 4113 at the position corresponding to the through hole. A fourth valve 4115 is provided on the powder guide 4110. A metering plate 4114 is mounted on the fourth valve 4115. A fifth support plate 417 is mounted on the metering plate 4114. Several [unclear text - possibly related to a fifth support plate 417] are provided in the middle of the fifth support plate 417. The powder passage hole 4171 is provided with a movable powder box 413 and a spatula 414 on the fifth support plate 417. The spatula 414 has four sides that cooperate to form a closed rectangle. The outlet of the powder box 413 is located inside the closed rectangle. The metering plate 4114 has several metering channels that correspond one-to-one with the powder passage hole 4171. The side of each metering channel near the fourth valve 4115 is connected to the valve core 41151 of the fourth valve 4115. The powder guide 4110 has several powder guiding channels 41102 that correspond one-to-one with the powder passage hole 4171. The other end of the valve core 41151 is connected to the corresponding powder guiding channel 41102.

[0080] This device is used to fill the reducing agent into a single firework inner tube paper cake in one operation. The firework inner tube paper cake consists of multiple inner tubes, forming an assembly of multiple paper tubes. Each inner tube is for one shot. The paper tubes are multi-layer composite paper tubes as used in existing technologies. They are non-conductive (to avoid static electricity igniting the pyrotechnics), have stable materials (they will not chemically react with the pyrotechnics), and are lightweight and low-cost, making them suitable for large-scale production and transportation. They comply with the national safety standard for fireworks and firecrackers, GB 10631 "Safety and Quality of Fireworks and Firecrackers". The embodiment of this application uses a 100-shot firework inner tube paper cake as an example. The firework inner tube paper cake is a regular hexagon. The arrangement of the powder passage hole 4171, metering channel, valve core 41151, and powder guiding channel 41102 is consistent with the arrangement of the inner tubes in the firework inner tube paper cake; that is, one inner tube corresponds to one powder passage hole 4171, metering channel, valve core 41151, and powder guiding channel 41102.

[0081] In the design, the volume from the powder passage 4171 to the bottom of the powder guiding channel 41102 is the volume of powder that needs to be filled into each inner tube of the firework inner tube paper cake. The firework inner tube paper cake is aligned correctly with the powder guide 4110 using a rotating lifting device 42. Before feeding the powder box 413, the fourth valve 4115 is closed. During the back-and-forth movement of the powder box 413 and the spatula 414, the powder is smeared into the metering channel through the powder passage 4171. Once the powder passage 4171 is filled with powder and leveled, the amount of powder filled in each powder passage 4171 and the corresponding metering channel is the amount of reducing agent powder that needs to be filled into each paper tube. This achieves the metering of the powder amount in a single paper tube without the need for electronic metering instruments, ensuring safety and reliability. Afterwards, the fourth valve 4115 is opened, and the powder from the metering channel falls into the inner tube of the firework inner tube paper cake through the powder guiding channel 41102, completing the filling of the reducing agent into the firework inner tube paper cake. The diameter of the powder guiding channel 41102 gradually tapers from top to bottom to reduce the falling speed of the powder, keeping it below 3 m / s to avoid the danger caused by static electricity accumulation due to excessive powder flow. The first powder filling device 4 has a simple structure and can fill one firework inner tube paper cake at a time, improving filling efficiency. It uses a metering channel for metering filling to avoid overfilling or underfilling.

[0082] Preferably, the fifth support plate 417 is provided with two second rodless cylinders 418 on both sides, and the fourth support plate 416 is mounted on the two second rodless cylinders 418. A through hole is opened in the center of the fourth support plate 416, and a spatula 414 is provided below the fourth support plate 416. The bottom of the spatula 414 contacts the fifth support plate 417. A powder box 413 communicating with the through hole is provided above the fourth support plate 416. The second rodless cylinders 418 can drive the fourth support plate 416 to move back and forth, driving the spatula 414 to smear the powder falling on the fifth support plate 417 into the powder passage hole 4171, and scrape the powder accumulated above the powder passage hole 4171 to avoid overfilling or underfilling. The powder box 413 moves with the fourth support plate 416 to facilitate the powder accumulated in the powder box 413 to fall down. The second rodless cylinders 418 are selected from the prior art, and their structure and working principle will not be described in detail. The distance between the two spatulas 414, which are parallel to the second rodless cylinder 418, is equal to the diameter of the circumcircle of the hexagonal powder passage holes 4171, preventing the powder from straying too far from the area of ​​the powder passage holes 4171. Furthermore, the powder box 413 is installed through a through hole, and the spatulas 414, made of anti-static rubber, are fixed to the outer walls of the powder box 413. This ensures that before the powder falls into the powder passage holes 4171, it remains within a closed rectangle formed by the four spatulas 414, allowing it to be moved by the spatulas 414.

[0083] Furthermore, a pressure strip 415 is provided on the side of the spatula 414 away from the powder box 413. The pressure strip 415 is located above the spatula 414 and is fixed to the powder box 413 together with the spatula 414. Since the spatula 414 is made of anti-static rubber, the pressure strip 415 can disperse the stress at the connection between the spatula 414 and the powder box 413, thereby improving the service life of the spatula 414. The spatula 414 is distributed on four sides, which makes it easy to replace it individually according to different wear conditions.

[0084] Furthermore, the fourth valve 4115 is hollow inside, and several small holes corresponding to the powder passage holes 4171 are opened on the two opposite walls of the fourth valve 4115. A valve core 41151 is installed between each pair of corresponding small holes on the two walls. One end of the valve core 41151 is provided with a nozzle 41152 extending into the metering channel, and the other end is provided with a nozzle 41152 extending into the powder guiding channel 41102. The valve core 41151 is an elastic tubular component, and a retaining ring 41153 is provided on the outer sleeve of the nozzle 41152. The shell of the fourth valve 4115 is connected to an air source through an air pipe. The air pipe connects to the inside of the shell, allowing air to enter the shell. This compresses the valve core 41151 to close the valve. After the air inside the shell is discharged, the valve core 41151 is released, opening the valve. At this time, the powder can enter the powder guiding channel 41102 through the inside of the valve core 41151.

[0085] Furthermore, the rotary lifting device 42 includes an eighth support plate 427 and a transition plate 422. The eighth support plate 427 is fixed below the second mounting plate 4113 by a plurality of positioning rods 421 located on the outer periphery of the through hole. The transition plate 422 is fixed between the second mounting plate 4113 and the eighth support plate 427 by a plurality of positioning rods 421. A through hole is provided in the middle of the transition plate 422. A lifting cylinder 426 is provided on the eighth support plate 427. The end of the telescopic rod of the lifting cylinder 426 is connected to a seventh support plate 425. A third rotary cylinder 424 is installed on the seventh support plate 425. The end of the output shaft of the third rotary cylinder 424 is connected to a sixth support plate 423 that can pass through the through hole. The lifting cylinder 426 and the third rotary cylinder 424 are based on existing technology, and their structure and working principle will not be described in detail. The lifting cylinder 426 can drive the seventh support plate 425 and the structure located on the seventh support plate 425 to lift and lower. The third rotary cylinder 424 can drive the sixth support plate 423 to rotate. When the powder is being filled, the inner tube paper cake of the fireworks is located on the sixth support plate 423. The lifting cylinder 426 can drive the sixth support plate 423 to approach the powder guide 4110, so that the inner tube is connected to the powder guide channel 41102.

[0086] Preferably, the sixth support plate 423 is provided with a positioning frame 4231 at the top. The shape of the positioning frame 4231 is adapted to the shape of the inner tube paper cake of the fireworks. One side is open, corresponding to the two sides adjacent to the inner tube paper cake of the fireworks, so as to facilitate the inner tube paper cake of the fireworks to enter and exit the positioning frame 4231. When the inner tube paper cake of the fireworks is located in the positioning frame 4231, the lifting cylinder 426 drives the sixth support plate 423 to rise, and each inner tube in the inner tube paper cake of the fireworks is connected to each powder guiding channel 41102.

[0087] Furthermore, the frame strips on both sides of the opening of the positioning frame 4231 can be designed to be flared outwards near the opening, so that the inner tube paper cake of the fireworks can easily enter the positioning frame 4231.

[0088] Furthermore, the powder guide 4110 is provided with a connecting part 41101 on the side away from the fourth valve 4115. The connecting part 41101 is located below the second mounting plate 4113. The shape of the connecting part 41101 is adapted to the shape of the inner tube paper cake of the firework, and accommodates the side of the inner tube paper cake of the firework that is close to the powder guide 4110. The outlet of the powder guiding channel 41102 is located in the connecting part 41101. The connecting part 41101 can better guide the inner tube paper cake of the firework to dock with the powder guide 4110.

[0089] Furthermore, the second mounting plate 4113 is also equipped with a height adjustment cylinder 434. The telescopic rod of the height adjustment cylinder 434 passes through the second mounting plate 4113 and connects to the third mounting plate 431 located below the second mounting plate 4113. A third push cylinder 432 is installed at the bottom of the third mounting plate 431, and a third push fork 433 is connected to the end of the output shaft of the third push cylinder 432. Both ends of the transition plate 422 are equipped with conveying devices. The conveying devices are selected from existing technologies, and their structure and working principle will not be described in detail. The conveyor belt is used to transport the inner tube paper cake of the fireworks to the transition plate 422 and to send the inner tube paper cake of the fireworks away from the filling platform 41. The third push fork 433 is located above the conveyor belt on the side that transports the inner tube paper cake of the fireworks to the transition plate 422. The opening shape of the third push fork 433 is the same as that of the positioning frame 4231, and the opening end faces the transition plate 422. During the process of the firework inner tube paper cake being conveyed from the conveyor belt to the transition plate 422, the telescopic rod of the height adjusting cylinder 434 retracts, causing the third mounting plate 431 and the components located on the third mounting plate 431 to rise, thus avoiding obstruction of the firework inner tube paper cake's transport. After the firework inner tube paper cake reaches the transition plate 422, the telescopic rod of the height adjusting cylinder 434 extends, allowing the third push fork 433 to push the firework inner tube paper cake into the positioning frame 4231 under the action of the third push cylinder 432. Then, the telescopic cylinder of the lifting cylinder 426 extends, pushing the firework inner tube paper cake into the connecting part 41101, allowing the firework inner tube paper cake to... Each paper tube in the cake is connected to each powder guiding channel 41102 for powder filling. After filling, the telescopic cylinder of the lifting cylinder 426 retracts, and the third rotary cylinder 424 is activated to rotate the sixth support plate 423 180° so that the opening of the positioning frame 4231 faces the conveyor belt that sends the inner paper tube cake of the firework away from the filling table 41. The third pushing cylinder 432 is activated to push the inner paper tube cake of the firework onto the conveyor belt and send it away from the filling table 41. This realizes the mechanical conveying of the inner paper tube cake of the firework, further improving production efficiency, reducing labor intensity, and allowing workers to stay away from the filling table 41, thus improving safety.

[0090] Furthermore, the powder guide 4110 is equipped with a first mounting plate 419 with a central connection hole, and a fourth valve 4115 corresponding to the position of the connection hole is installed on the first mounting plate 419. The bottom of the first mounting plate 419 is also equipped with a third vibration device 4111, which can compact the filling powder. The vibration device is preferably a pneumatic vibrator or a pneumatic impact hammer.

[0091] Furthermore, it also includes a material bin 412, the bottom of which extends into the powder box 413. A third hopper 411 is also provided on the material bin 412, located at the top center of the material bin 412. The third hopper 411 is directly below the mixer 31 and close to the mixer 31. The reducing agent mixed by the first powder mixing device 3 can fall into the third hopper 411. The outlet at the bottom of the material bin 412 is a long strip-shaped outlet, guiding the powder above the centerline of the powder box 413 along its length. The length of the long strip-shaped outlet is greater than the side length of the regular hexagon formed by the powder passage 4171, but less than the circumscribed circle diameter of the regular hexagon formed by the powder passage 4171, preventing the powder from falling too dispersed and concentrated on the fifth support plate 417. To prevent some powder from not being able to be spread into the powder passage holes 4171 in the fifth support plate 417, excess powder can be added into the third hopper 411 so that each powder passage hole 4171 can be filled.

[0092] It should be noted that during feeding, the opening of the positioning frame 4231 faces the direction of the inner tube paper cake of the fireworks. The inner tube paper cake of the fireworks needs to be placed on the conveyor belt at the correct angle. Guide rods can be set on both sides of the conveyor belt. The distance between the two guide rods is slightly greater than the short diagonal of the inner tube paper cake of the fireworks, so as to facilitate the correct placement of the inner tube paper cake of the fireworks.

[0093] Unless otherwise specified, the components through which the powder flows shall be made of copper or antistatic plastic to enhance safety.

[0094] All pneumatic devices, such as the fourth valve 4115, height adjustment cylinder 434, third push cylinder 432, lifting cylinder 426, second rodless cylinder 418, third rotary cylinder 424, and the power cylinder of the conveying device, are connected to an air source via air ducts. Each air duct is equipped with a solenoid valve between itself and the air source. Each solenoid valve is connected to a control system and controlled by the control system. The control system and its control principle are existing technology and will not be described in detail here. To avoid safety hazards caused by the solenoid valves and control system, the control system, air source, and solenoid valves can be installed outside the safety door of the production workshop.

[0095] Work process: When the fourth valve 4115 is closed, the telescopic rod of the height adjusting cylinder 434 retracts, and the inner tube paper cake of the firework is conveyed to the transition plate 422 by the conveyor belt. The telescopic rod of the height adjusting cylinder 434 extends, so that the third push fork 433 can push the inner tube paper cake of the firework into the positioning frame 4231 under the action of the third push cylinder 432. Then, the telescopic cylinder of the lifting cylinder 426 extends, pushing the inner tube paper cake of the firework into the connecting part 41101, so that each inner tube in the inner tube paper cake is connected to each powder guiding channel 41102. The mixed reducing agent powder is introduced into the third hopper 411. The powder is guided into the powder box 413 through the material box 412 and falls onto the fifth support plate 417. The second rodless cylinder 418 is started, and the powder box 413 and the trowel 414 move back and forth on the fifth support plate 417. The trowel 414 spreads the powder into the powder passage hole 4171. When each powder passage hole 4171 is filled with powder and leveled by the trowel 414, the second rodless cylinder 418 is turned off and the fourth valve 4115 is opened. The powder falls into the inner cylinder through the valve core 41151 and the powder guiding channel 41102, completing the filling of the reducing agent in the inner cylinder paper cake of the fireworks. Next, the fourth valve 4115 is closed, the telescopic cylinder of the lifting cylinder 426 is retracted, the third rotating cylinder 424 is started to rotate the sixth support plate 423 180°, so that the opening of the positioning frame 4231 faces the conveyor belt that sends the inner tube paper cake away from the filling table 41. The third pushing cylinder 432 is started to push the inner tube paper cake onto the conveyor belt and send it away from the filling table 41. The telescopic rod of the height adjusting cylinder 434 is retracted, and the next inner tube paper cake is transported to the transition plate 422.

[0096] The structure of the second powder filling device 7 is similar to that of the first powder filling device 4. Since the inner cylinder of the firework inner tube cake is already filled with reducing agent when filling the oxidant, the second powder filling device 7 needs to be isolated from the second powder mixing device 6 through a safety explosion-proof wall to meet the needs of safe production. Therefore, the oxidant mixed by the second powder mixing device 6 needs to be transported to the second powder filling device 7 through a conveying device. To facilitate the feeding of the second powder filling device 7, the second powder filling device 7 uses a discharge chute in the prior art instead of the third hopper 411 in the first powder filling device 4. One end of the discharge chute is at a higher horizontal position, which can receive the oxidant powder falling from the end of the conveying device. The other end of the discharge chute is at a lower horizontal position and extends into the material box of the second powder filling device 7.

[0097] In some embodiments, the conveying device includes a linear conveyor and a corner conveyor 1. The linear conveyor is a conveyor belt conveyor as in the prior art, and the conveyor belt conveyor is driven by a rotary cylinder, selected from the prior art. Specific structure and working principle are not described in detail. Please refer to [link to relevant documentation]. Figure 2 , Figure 3 As shown, the corner conveyor 1 includes: The first conveying device 102 and the second conveying device 103 are arranged at an angle to each other; The indexing device 101 is arranged at the intersection of the extension lines of the first conveying device 102 and the second conveying device 103. The indexing device 101 includes a first push cylinder 1014 and a first rotary cylinder 1017. The output shaft of the first rotary cylinder 1017 is fixedly connected to an indexing plate 1016, and the telescopic rod of the first push cylinder 1014 is connected to a first push fork 1015. The indexing plate 1016 is used to receive the material conveyed by the second conveying device 103 and adjust the direction of the material; The first push fork 1015 is used to push the material on the indexing plate 1016 onto the first conveying device 102.

[0098] Furthermore, the second conveying device 103 is provided with a booster device at one end near the indexing device 101. The booster device includes a gantry frame 1031, a support base 1032 is provided on the top of the gantry frame 1031, and a first lifting cylinder 1033 is provided on the side of the support base 1032 facing the indexing device 101. The end of the telescopic cylinder of the first lifting cylinder 1033 is connected to a second pushing cylinder 1034, and the end of the telescopic cylinder of the second pushing cylinder 1034 is connected to a second push fork 1035.

[0099] The first conveying device 102 and the second conveying device 103 are belt conveyors driven by rotary cylinders, selected from existing technology. Their specific structure and working principle are not detailed here. The conveyed material is a firework inner tube paper cake. The firework inner tube paper cake is placed at the correct angle on the belt of the second conveying device 103. At the end of the second conveying device 103, the firework inner tube paper cake falls onto the rotating plate 1016 due to inertia. The first rotary cylinder 1017 drives the rotating plate 1016 to rotate, adjusting the direction of the firework inner tube paper cake and aligning it with the belt of the first conveying device 102. The first pushing cylinder 1014 is then activated to push the firework inner tube paper cake onto the belt of the first conveying device 102, completing the corner transport of the firework inner tube paper cake. This offsets the main shaft direction of adjacent process equipment, thereby reducing the risk of an explosion. It should be noted that the first pushing cylinder 1014 is a horizontal pushing cylinder, and the pushing direction of the first pushing cylinder 1014 is the conveying direction of the first conveying device 102, so that after the rotating plate 1016 adjusts the angle of the inner tube paper cake of the fireworks, the angle of the inner tube paper cake pushed onto the first conveying device 102 does not change. In order for the first pushing cylinder 1014 to smoothly push the inner tube paper cake of the fireworks with the burning paper onto the first conveying device 102, the upper surfaces of the first conveying device 102 and the rotating plate 1016 are at the same height.

[0100] Furthermore, the rotation device 101 also includes a support leg 1011, on which a first support plate 1012 is provided. One end of the first support plate 1012 is provided with a support frame 1013, and the other end is provided with a first rotary cylinder 1017. A first push cylinder 1014 is provided on the top of the support frame 1013, so that the horizontal position of the bottom of the first push fork 1015 is higher than the horizontal position of the top of the rotation plate 1016, thereby preventing the rotation plate 1016 from interfering with the first push fork 1015 pushing the inner tube paper cake of the fireworks.

[0101] Furthermore, the booster device includes a gantry frame 1031, a support base 1032, a first lifting cylinder 1033, a second pushing cylinder 1034, and a second push fork 1035. The gantry frame 1031 is located at one end of the second conveying device 103 near the indexing device 101. The top of the gantry frame 1031 is provided with the support base 1032. The side of the support base 1032 facing the indexing device 101 is provided with the first lifting cylinder 1033. The end of the telescopic cylinder of the first lifting cylinder 1033 is connected to the second pushing cylinder 1034, and the end of the telescopic cylinder of the second pushing cylinder 1034 is connected to the second push fork 1035. The second push fork 1035 pushes the firework inner tube paper cake conveyed to the indexing plate 1016 into position, preventing the firework inner tube paper cake from being thrown out when the indexing plate 1016 rotates. The second push fork 1035 can be raised and lowered under the action of the first lifting cylinder 1033, avoiding affecting the transportation of the firework inner tube paper cake on the second conveying device 103.

[0102] Furthermore, the outer periphery of the upper surface of the rotating plate 1016 is provided with a step 10161, and the step 10161 has an inlet / outlet channel. The two side walls of the inlet / outlet channel are arc-shaped, so that the width of the inlet / outlet channel on the side near the edge of the rotating plate 1016 is greater than the width on the side near the center of the rotating plate 1016. The horizontal position of the bottom of the first push fork 1015 is higher than the horizontal position of the top of the step 10161. The included angle between the first conveying device 102 and the second conveying device 103 is 90°, that is, the inner tube paper cake of the fireworks is rotated 90° for conveying. The corner transport is conducive to making full use of the workshop space and offsetting the main axis direction of any two adjacent process equipment, thereby reducing the harm of explosion accidents. The step 10161 specifically includes two first steps arranged at a 120° included angle. The other end of each of the two first steps is connected to a second step. The two second steps are symmetrically arranged with respect to the angle bisector of the two first steps. The included angle between the connected first steps and the second steps is 120°. The inlet / outlet channel is located on the side opposite to the two first steps. Step 10161 can position the inner tube paper cake of the fireworks to prevent it from falling off the rotating plate 1016. The shape formed by step 10161 on the side of the center of rotating plate 1016 is adapted to the shape of the regular hexagonal inner tube paper cake of the fireworks, guiding the inner tube paper cake of the fireworks to fall into rotating plate 1016 at a preset angle. When the second push fork 1035 pushes the inner tube paper cake of the fireworks to the outer wall and contacts step 10161, it means that it has been pushed into place. The second push fork 1035 can be retracted. After rotating plate 1016 rotates, the inlet and outlet channel is directly opposite the first conveying device 102 and remains centered.

[0103] The first push fork 1015 has a "<"-shaped notch at the end away from the first push cylinder 1014. Specifically, the first push fork 1015 includes a connecting plate fixedly connected to the end of the telescopic rod of the first push cylinder 1014. The bottom of the connecting plate has a base plate arranged perpendicular to the connecting plate. The end of the base plate away from the connecting plate has a "<"-shaped notch. The "<"-shaped notch is an isosceles triangle notch with a apex angle of 120°. The "<"-shaped notch on the first push fork 1015 is suitable for the angle shape of the inner tube paper cake of the fireworks. When pushing the inner tube paper cake, the angle of the inner tube paper cake of the fireworks will not change, which is conducive to achieving centering and conveying. The second push fork 1035 adopts the same structure as the first push fork 1015.

[0104] Furthermore, the base plate is provided with side plates on both sides, which are arranged perpendicularly to both the connecting plate and the base plate. The end of the side plate away from the connecting plate is rounded to avoid damaging the inner tube paper cake of the firework containing the medicated paper.

[0105] It should be noted that the inner tube paper cake of the fireworks needs to be placed on the conveyor belt of the second conveyor device 103 at the correct angle. Guide rods can be set on both sides of the conveyor belts of the first conveyor device 102 and the second conveyor device 103. The distance between the two guide rods is slightly greater than the short diagonal of the inner tube paper cake of the fireworks, so as to facilitate the correct placement of the inner tube paper cake of the fireworks.

[0106] The pneumatic devices described in this application, such as the first push cylinder 1014, the first rotary cylinder 1017, the first conveying device 102, the second conveying device 103, the first lifting cylinder 1033, and the power cylinder of the second push cylinder 1034, are all connected to an air source through air ducts. Each air duct is equipped with a solenoid valve between itself and the air source. Each solenoid valve is connected to a control system and controlled by the control system. The control system and its control principle are existing technologies and will not be described in detail here. To avoid safety hazards caused by the solenoid valves and control system, the control system, air source, and solenoid valves can be installed outside the safety door of the production workshop.

[0107] Working principle: The telescopic cylinder of the first lifting cylinder 1033 retracts, causing the second pushing cylinder 1034 and the second pushing fork 1035 to rise, facilitating the passage of the fireworks paper and inner tube paper cake under the gantry frame 1031. The inlet and outlet passage of the rotating plate 1016 faces the second conveying device 103. At this time, the angle bisectors of the two first steps and the center line of the conveyor belt of the second conveying device 103 are located in the same vertical plane and are parallel or collinear. The fireworks inner tube paper cake is placed on the conveyor belt of the second conveying device 103 at the correct angle. Under the inertia of the second conveying device 103, the fireworks inner tube paper cake falls onto the rotating plate 1016. At this time, the fireworks inner tube paper cake has not yet fully reached the bottom of the conveyor belt. In this position, the first lifting cylinder 1033 can be activated to lower the second push fork 1035 to a position where it can push the inner tube paper cake of the firework. The second pushing cylinder 1034 is then activated to push the inner tube paper cake to the outer wall, where it contacts the step 10161. The second push fork 1035 is then retracted and raised. The first rotating cylinder 1017 is then activated to rotate the plate 1016 90°, so that the inlet / outlet channel of the rotating plate 1016 faces the first conveyor device 102. At this point, the angle bisectors of the two first steps and the center line of the conveyor belt of the first conveyor device 102 are located in the same vertical plane and are parallel or collinear. The angle bisector of the apex of the notch is also located in the same vertical plane and is parallel to the angle bisectors of the two first steps. The first pushing cylinder 1014 is activated to drive the first push fork 1015 to push the inner tube paper cake of the firework onto the conveyor belt of the first conveyor device 102, completing the corner conveying of the inner tube paper cake and maintaining its centering.

[0108] In some embodiments, please refer to Figures 17-19As shown, the first mixing device 8 includes a rotary device 83 and a mixing device frame 82 fixed to the drive end of the rotary device 83. Several rotary swing cylinders 84 are evenly distributed around the outer periphery of the mixing device frame 82. A mixing box 81 is installed at the drive end of the rotary swing cylinders 84. The mixing box 81 includes a box body 811. A feed inlet is provided on the side of the box body 811 away from the mixing device frame 82. A cover plate 815 and a push plate 817 are movably installed inside the box body 811. The cover plate 815 is located above the push plate 817. A material support plate 818 is provided at the bottom inner side of the box body 811.

[0109] The rotary device 83 preferably uses a cam divider from the prior art to accurately convert continuous rotary motion into intermittent indexing motion. Its structure and working principle will not be described in detail. Its driving method can be electric or pneumatic, with pneumatic driving being preferred. The first mixing device 8 can be provided with several mixing boxes 81. In the preferred embodiment of this application, four mixing boxes 81 are provided, and the included angle between each mixing box 81 is 90°. Firework inner tube paper cakes filled with reducing agent and oxidizing agent are fed into box 811 through the feed port. Cover plate 815 moves onto the fireworks inner tube paper cake, covering the filling ports of all paper tubes of the fireworks inner tube paper cake. Rotary swing cylinder 84 is activated to drive box 811 to rotate. Firework inner tube paper cakes are flipped with box 811. Since the fireworks inner tube paper cakes have been filled with a preset ratio of reducing agent and oxidizing agent in the previous process before entering box 811, the volume of the opening charge composed of oxidizing agent and reducing agent is about 70% of the paper tube volume, and the total weight of the opening charge is about 3g-4g. During the flipping process, the stratification is broken, and the oxidizing agent and reducing agent are mixed in the paper tube. At the same time, the fireworks inner tube paper cakes are flipped multiple times to compact the powdered raw materials in the paper tube, so that the powder mixing and compaction are carried out simultaneously. While the mixing chamber 811 is flipped and mixed, the rotary device 83 drives the mixing device frame 82 to rotate, moving the next chamber 811 to the feeding station. Simultaneously, the mixed firework inner tube paper cake is sent to the discharge station via the rotary device 83, and the pusher plate 817 pushes the firework inner tube paper cake out of the chamber 811. Compared to the existing technology where the oxidant and reductant are first mixed in a low-speed ball mill or electrostatic mixer and then temporarily stored in an explosion-proof container before being filled into the firework inner tube paper cake by a filling device, the first mixing device 8 works on firework inner tube paper cakes that have already been filled with oxidant and reductant separately. It can simultaneously mix the powder from multiple firework inner tube paper cakes, mixing the oxidant and reductant in each paper tube separately, achieving small-volume, isolated mixing, improving mixing uniformity, reducing safety risks, and simultaneously compacting the powder in each paper tube, thus improving production quality.

[0110] Furthermore, a third rodless cylinder 816 is fixedly installed on the outer wall of the housing 811 on both sides of the feed inlet. A sliding groove is provided on the side wall where the third rodless cylinder 816 is installed. The push plate 817 extends from both sides of the sliding groove and is fixed to the drive ends of the two third rodless cylinders 816. When the housing 811 is empty, the push plate 817 is located at the end furthest from the feed inlet, i.e., the initial position, to avoid obstructing the entry of the firework inner tube paper cake into the housing 811. After the firework inner tube paper cake in the housing 811 has been mixed, the third rodless cylinder 816 is activated to drive the push plate 817 to push it towards the feed inlet, thereby pushing the firework inner tube paper cake out of the housing 811 and onto the conveying device. After pushing, the push plate 817 returns to its initial position.

[0111] Furthermore, a support 812 is provided on the outer side of the top wall of the box 811, and a second lifting cylinder 814 is installed on the support 812. The telescopic rod of the second lifting cylinder 814 passes through the top wall of the box 811 and connects to the cover plate 815. One end of the paper tube of the firework inner tube is sealed with sealing material, and the other end is open as a filling port. The oxidant and reducing agent are filled into the paper tube through the filling port. When the firework inner tube paper tube enters the box 811 and flips, the second lifting cylinder 814 is activated to drive the cover plate 815 down to close the filling port and prevent the powder from spilling out. The cover plate 815 is made of anti-static plastic material and has a smooth surface to reduce friction.

[0112] Furthermore, the bottom inner side of the box 811 is provided with a material support plate 818, the shape of which is adapted to the shape of the inner tube paper cake of the fireworks, which helps to prevent the inner tube paper cake of the fireworks from deviating in position.

[0113] Furthermore, the mixing device frame 82 includes a connecting plate 824 and a turntable 821 fixedly connected to the drive end of the rotary device 83. Several pads 822 are evenly distributed on the turntable 821, and each pad 822 is equipped with a support column 823. The connecting plate 824 is supported by all the support columns 823 and arranged parallel above the turntable 821. A rotary swing cylinder 84 is installed on the side of each support column 823 away from the center line of the turntable 821. The rotary device 83 drives the turntable 821 to rotate. Each 90° rotation pauses the feeding of the inner tube paper cake into the box 811 at the feeding station, while simultaneously feeding the inner tube paper cake out of the box 811 at the discharging station. Each inner tube paper cake rotates 270° under the action of the rotary device 83 and leaves the box 811. During the movement from the feeding station to the discharging station, the rotary swing cylinder 84 drives the box 811 to rotate 360°, completing the mixing and compaction of the oxidant and reducing agent. The plane of rotation of turntable 821 driven by rotary device 83 is perpendicular to the plane of rotation of housing 811 driven by rotary swing cylinder 84. A base is provided under rotary device 83 to support rotary device 83, but the base is not shown in the figure.

[0114] Furthermore, a support frame 825 is fixed between the pad block 822 and the support column 823 to enhance the structural performance.

[0115] Furthermore, both the feeding and discharging stations of the first mixing device 8 are equipped with conveying devices for conveying the inner tube paper cakes of fireworks into or out of the first mixing device 8. The conveying devices of the two stations are arranged at an angle, and the angle between the conveying devices of the two stations is the same as the angle between two adjacent mixing boxes 81. The conveying devices of the two stations are at the same height as the receiving plate 818 inside the box 811, which facilitates the smooth flow of the inner tube paper cakes of fireworks. Four mixing boxes 81 are provided, and the angle between each mixing box 81 is 90°. The angle between the conveying devices of two stations is also 90°. During the process of moving from the feeding station to the discharging station, each inner tube paper cake of fireworks is rotated 270° by the turntable 821. If there are six mixing boxes 81, with an included angle of 60° between each mixing box 81, then the included angle between the conveying devices of the two stations is also 60°. During the process of moving from the feeding station to the discharging station, each firework inner tube paper cake is rotated 300° by a turntable 821. The conveying devices of the two stations are selected as conveyor belt conveyors, and the conveyor belts are made of anti-static plastic material. The power of the conveying device is a rotary cylinder. The conveying device is selected from existing technology, and its structure and working principle will not be described in detail.

[0116] Furthermore, a booster device is provided at the end of the conveying device located near the mixing box 81 at the feeding station. The booster device has the same structure as the booster device in the corner conveying device 1. The inner tube paper cake of the fireworks is sent into the box 811 by the conveying inertia of the feeding side conveying device. Usually, due to insufficient inertial force, the inner tube paper cake of the fireworks does not completely enter the box 811. At this time, the booster device is activated to push the inner tube paper cake of the fireworks to the preset position. After pushing, the booster device returns to the initial state.

[0117] To reduce safety risks, the housing 811 and the mixing device frame 82 in this application are made of stainless steel, copper, or anti-static plastic. All pneumatic devices described in this application, such as the second lifting cylinder 814, the third rodless cylinder 816, the power cylinder of the rotary device 83, and the power cylinder of the rotary swing cylinder 84, are connected to an air source via air ducts. Each air duct is equipped with a solenoid valve between itself and the air source. Each solenoid valve is connected to a control system and controlled by the control system. The control system and its control principle are existing technology and will not be described in detail here. To avoid safety hazards caused by the solenoid valves and control system, the control system, air source, and solenoid valves can be installed outside the safety door of the production workshop.

[0118] Work process reference: The inner tube paper cake of the fireworks is conveyed into the box 811 at the correct angle via the conveyor belt, and the booster device is activated to push the inner tube paper cake of the fireworks to the preset position. The second lifting cylinder 814 is activated, driving the cover plate 815 downward to close the filling port, fixing the firework inner tube paper cake. The rotary device 83 is then activated to drive the turntable 821 to rotate. Then, the rotary swing cylinder 84 is activated to drive the box 811 to rotate, mixing the powder. Every 90° rotation of the turntable 821 driven by the rotary device 83, the firework inner tube paper cake is placed in the box 811 at the feeding station. This continues until the turntable 821 rotates 270° under the drive of the rotary device 83, reaching the discharge station. The rotary swing cylinder 84 is then turned off. At this time, the paper tube filling port is kept facing upward. The second lifting cylinder 814 moves upward with the cover plate 815. The third rodless cylinder 816 is activated, causing the push plate 817 to push out towards the feeding port, thus pushing the firework inner tube paper cake onto the conveyor belt of the conveyor device on the discharge side, and transporting it to the next station via the conveyor device.

[0119] The bright beads required to form the inner tube effect components of the fireworks are transported to the bright bead filling device 10 via a negative pressure elevator 9. The negative pressure elevator 9 and the bright bead filling device 10 are existing technologies, and this application does not improve their structures. Therefore, the specific structures and working principles of the negative pressure elevator 9 and the bright bead filling device 10 will not be described in detail. The structure of the second mixing device 11 is the same as that of the first mixing device 8.

[0120] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A fireworks inner tube loading production line, characterized in that, include: The first powder filling device (4) fills the reducing agent required to form the opening powder of the firework inner tube into each inner tube of the firework inner tube paper cake according to the preset amount; The second powder filling device (7) fills the oxidant required to form the opening powder of the firework inner tube into each inner tube of the firework inner tube paper cake according to the preset amount; The first mixing device (8) mixes the reducing agent and oxidizing agent in each inner tube of the firework inner tube paper cake evenly to form the opening agent; The bright bead filling device (10) fills the bright beads required to form the firework inner tube effect parts into each inner tube of the firework inner tube paper cake according to a preset amount; The second mixing device (11) mixes the opening powder and bright beads in each inner tube of the firework inner tube paper cake evenly; The conveying device transports the inner tube paper cake of the fireworks to or from the first powder filling device (4), the second powder filling device (7), the first mixing device (8), the bright bead filling device (10), and the second mixing device (11).

2. The fireworks inner tube loading production line according to claim 1, characterized in that, The first powder filling device (4) includes a filling platform (41) and a rotary lifting device (42). The filling platform (41) includes a frame (4112). A second mounting plate (4113) is installed on the frame (4112). A through hole is opened in the center of the second mounting plate (4113). A rotary lifting device (42) is provided below the through hole. A powder guide (4110) is provided on the second mounting plate (4113) at the position corresponding to the through hole. A fourth valve (4115) is provided on the powder guide (4110). A metering plate (4114) is installed on the fourth valve (4115). A fifth support plate (417) is installed on the metering plate (4114). A plurality of [missing information] are provided in the middle of the fifth support plate (417). The powder passage hole (4171) is provided with a movable powder box (413) and a spatula (414) on the fifth support plate (417). The spatula (414) has four sides that cooperate to form a closed rectangle. The outlet of the powder box (413) is located inside the closed rectangle. The metering plate (4114) has several metering channels that correspond one-to-one with the powder passage hole (4171). The side of each metering channel closest to the fourth valve (4115) is connected to the valve core (41151) of the fourth valve (4115). The powder guide (4110) has several powder guiding channels (41102) that correspond one-to-one with the powder passage hole (4171). The other end of the valve core (41151) is connected to the corresponding powder guiding channel (41102).

3. The fireworks inner tube loading production line according to claim 1, characterized in that, A first powder mixing device (3) is provided above the first powder filling device (4). The first powder mixing device (3) includes a support (36), a second hopper (32) installed on the support (36), and a mixer (31) located directly below the second hopper (32). The mixer (31) is installed on the support (36) through a second rotary cylinder (35). The mixer (31) includes a mixing component (313). The two ends of the mixing component (313) are respectively connected to a first transition hopper (312) and a second transition hopper (315). The first transition hopper (312) is connected to a second valve (311). The other end of the second valve (311) is directly opposite the outlet of the second hopper (32). The second transition hopper (315) is connected to the third valve (316). The other end of the third valve (316) is connected to the first powder filling device (4). The mixing component (313) has a mixing channel inside. The mixing channel is connected to the internal cavity of the first transition hopper (312) and the second transition hopper (315). The flow channel of the second valve (311) is connected to the internal cavity of the first transition hopper (312). The flow channel of the third valve (316) is connected to the internal cavity of the second transition hopper (315).

4. The fireworks inner tube loading production line according to claim 3, characterized in that, The mixing component (313) has an axially penetrating cavity inside, and a left-hand rotating plate (3131) and a right-hand rotating plate (3132) are arranged sequentially along the axial direction inside the cavity, so that a mixing channel is formed inside the cavity.

5. The fireworks inner tube loading production line according to claim 1, characterized in that, A first powder screw conveyor (2) is provided next to the first powder filling device (4). The first powder screw conveyor (2) includes a third conveying device (22), a feeding device (21) provided at the feeding end of the third conveying device (22), and a metering device (23) provided at the discharge end of the third conveying device (22). The feeding device (21) includes a feeding bin (211). The bottom of the feeding bin (211) is provided with a first hopper (215) that connects the feeding bin (211) and the interior of the third conveying device (22). The bottom of the feeding bin (211) is a spherical cavity, and the upper part is a funnel-shaped cavity.

6. The fireworks inner tube loading production line according to claim 5, characterized in that, The metering device (23) includes a second support plate (232), a third support plate (239), a connector (231), and a metering pipe (236). A leveling device is movably provided between the second support plate (232) and the third support plate (239). A first mounting hole is provided in the middle of the second support plate (232), and the connector (231) communicating with the third conveying device (22) is installed in the first mounting hole. A second mounting hole is provided in the third support plate (239), and the top of the metering pipe (236) is fixedly installed in the second mounting hole. A second mounting device is installed at the bottom of the metering pipe (236). A valve (237) and a scraping device are provided with a connecting joint (231) and a metering pipe (236) through hole; the scraping device includes a box body (234), the top of the box body (234) is an open structure, the bottom is provided with a scraper (235), the scraper (235) is provided with a through hole, the bottom of the joint (231) extends into the box body (234), the box body (234) is provided with a first rodless cylinder (233) on both sides, the first rodless cylinder (233) is supported on a third support plate (239), and the bottom of the first valve (237) is provided with a discharge pipe (238).

7. The fireworks inner tube loading production line according to claim 1, characterized in that, The first mixing device (8) includes a rotary device (83) and a mixing device frame (82) fixed to the drive end of the rotary device (83). Several rotary swing cylinders (84) are evenly distributed around the outer periphery of the mixing device frame (82). A mixing box (81) is installed at the drive end of the rotary swing cylinder (84). The mixing box (81) includes a box body (811). A feed inlet is provided on the side of the box body (811) away from the mixing device frame (82). A cover plate (815) and a push plate (817) are movably installed inside the box body (811). The cover plate (815) is located above the push plate (817). A material support plate (818) is provided at the bottom of the inner side of the box body (811).

8. The fireworks inner tube loading production line according to claim 1, characterized in that, The conveying device includes a straight conveying device and a corner conveying device (1), the corner conveying device (1) including: A first conveying device (102) and a second conveying device (103) are arranged at an angle. The indexing device (101) is arranged at the intersection of the extension lines of the first conveying device (102) and the second conveying device (103); The indexing device (101) includes a first push cylinder (1014) and a first rotary cylinder (1017). The output shaft of the first rotary cylinder (1017) is fixedly connected to an indexing plate (1016), and the telescopic rod of the first push cylinder (1014) is connected to a first push fork (1015). The indexing plate (1016) is used to receive the material conveyed by the second conveying device (103) and adjust the direction of the material; The first push fork (1015) is used to push the material on the indexing plate (1016) onto the first conveying device (102).

9. The fireworks inner tube loading production line according to claim 8, characterized in that, The second conveying device (103) is provided with a booster device at one end near the indexing device (101). The booster device includes a gantry frame (1031). A support seat (1032) is provided on the top of the gantry frame (1031). A first lifting cylinder (1033) is provided on the side of the support seat (1032) facing the indexing device (101). A second pushing cylinder (1034) is connected to the end of the telescopic cylinder of the first lifting cylinder (1033). A second push fork (1035) is connected to the end of the telescopic cylinder of the second pushing cylinder (1034).

10. The fireworks inner tube loading production line according to claim 1, characterized in that, The bright beads required to form the inner tube effect parts of the fireworks are transported to the bright bead filling device (10) by a negative pressure elevator (9).

Images