Small flower firework with multi-stage burst effect

Abstract

The utility model discloses a small gift firework with multistage effect of opening and exploding, including the multistage effect of opening and exploding cylinder of being arranged in the launching cylinder, the multistage effect of opening and exploding cylinder is combined by 3~5 cylinder bodies, the gravity center of the combination of two and two or more cylinder bodies all deviates the bottom end of the combination, the lower part of upper cylinder is nested and inserts the upper port of being glued in the lower cylinder, the effect medicine is filled in each cylinder, the bottom port of cylinder is closed and installs the burnt lead, the burnt lead of the lowermost cylinder is connected with the transmission of fire of launching charge in the launching cylinder, the burnt lead of the rest cylinder is connected with the transmission of fire of effect medicine in the lower cylinder. Effectively, the effect of setting off is enriched, and the secondary cylinder is pushed upward to avoid the danger of low explosion, the sleeve joint structure of multiple cylinder effectively avoids the phenomenon of the cylinder explosion caused by the string fire and the explosion, and the setting off safety is ensured, and meanwhile, the production of each cylinder is convenient.

Description

Technical Field

[0001] This utility model relates to a small firework display. Background Technology

[0002] Small fireworks refer to fireworks that launch one or more effect components from within a tube, producing various flower shapes and patterns in the air or over water. In existing technology, the effect tube (also called the inner tube or effect component) of small fireworks consists of only one tube filled with effect propellant. The tube is sealed at both ends, with a ignition fuse at the lower end. The effect tube is placed above the propellant in the launch tube. When the propellant ignites and explodes, it propels the effect tube into the air. The explosion ignites the ignition fuse, which has a delay function. After a set delay, the ignition fuse ignites the effect propellant in the rising effect tube, causing it to explode and display the corresponding pyrotechnic effects. Its drawback is that each launch of the effect tube can only produce one explosion and corresponding pyrotechnic effect, which is not conducive to a rich variety of effects.

[0003] In existing technology, there are other types of fireworks products that achieve two-stage explosions through a double-layered charge within a single cylinder. For example:

[0004] Double-bang firecrackers, named for their two-layered gunpowder filling that produces two explosions upon ignition, are colloquially known as "two-stage firecrackers." The double-layered gunpowder design within the tube achieves the double-bang effect. After being ignited on the ground, the first explosion (first stage) propels the firecracker high into the air, triggering the second explosion (second stage). However, if the first explosion is ignited after the firecracker has been launched into the air, the direction of the propulsion becomes uncontrollable, potentially causing the second explosion to low-pitched and resulting in a dangerous situation. Therefore, they are only suitable for ground-based use, and ignition must strictly adhere to national standards, requiring the firecracker to be ignited vertically on the ground. They are unsuitable for use in small decorative fireworks.

[0005] Another example is the "tube-launched rocket firework" disclosed in Chinese utility model patent document CN2341114Y, dated September 29, 1999. Its rocket body 11 has multiple layers of propellant inside its tube, including a first bright bead layer 8, a gunpowder layer 9, and a second bright bead layer 10. When the first bright bead layer 8 (first stage) explodes in the air, it detonates the gunpowder layer 9, which continues to propel the arrowhead (i.e., the sealing material 12) upwards and ignites the second bright bead layer 10 (second stage). With the help of the tail fin 7 and the arrowhead, the second stage can continue to rise upwards upon ignition, avoiding the risk of low-explosion. However, its rocket body 11 requires a tail fin and a conical arrowhead, resulting in a complex structure, difficult assembly, and inconsistent effects. It is only suitable for rocket fireworks and is similarly unsuitable for small firework effect tubes.

[0006] Moreover, existing technology can only achieve two-stage combustion and explosion through layered explosive charges, and crossfire between the two layers of explosives can easily occur, leading to quality problems such as the explosion of the tube. Utility Model Content

[0007] To address the aforementioned drawbacks, the technical problem this invention aims to solve is to provide a small firework display with a multi-stage explosion effect, capable of producing 3-5 explosions and corresponding pyrotechnic effects. The technical solution adopted by this invention is a small firework display with a multi-stage explosion effect, characterized by comprising a multi-stage explosion effect tube installed within a launch tube. This multi-stage explosion effect tube is composed of 3-5 tubes sequentially nested together. The radial dimensions and height of each tube decrease sequentially from bottom to top, and the center of gravity of the assembly formed by two or more tubes is biased towards the bottom end of the assembly. The lower part of the upper tube is nested and glued into the upper port of the lower tube. Each tube is filled with effect explosives, and the bottom port of the tube is sealed and fitted with a ignition fuse. The ignition fuse of the lowest tube is connected to the propellant in the launch tube for ignition transmission, while the ignition fuses of the remaining tubes are connected to the effect explosives in the lower tube for ignition transmission.

[0008] The beneficial effects of this utility model are that, by adopting the technical solution of this utility model, small fireworks can produce 3 to 5 explosions and corresponding pyrotechnic effects, effectively enriching the display effect; it can ensure that the secondary tube is pushed upward to avoid the danger of low-explosion, and the nested structure of multiple tubes effectively avoids the phenomenon of tube explosion caused by crossfire and sympathetic explosion, ensuring the safety of the display; at the same time, the production of each tube is compatible with existing production processes, making production convenient.

[0009] To ensure that low-temperature explosions do not occur, preferably, the delay time of the ignition fuse for each cylinder decreases sequentially from bottom to top. More specifically, the delay time of the ignition fuse for each cylinder decreases sequentially by 0.8 to 1.2 seconds, particularly by 0.9 to 1.1 seconds.

[0010] In one embodiment, the multi-stage detonation effect cylinder is composed of a first-stage cylinder, a second-stage cylinder, and a third-stage cylinder, which are nested together sequentially. The first-stage cylinder has an inner diameter of 40mm, an outer diameter of 45mm, and a height of 120mm, with a ignition fuse burning rate of 70-80 s / m. The second-stage cylinder has an inner diameter of 32mm, an outer diameter of 38mm, and a height of 50mm, with a ignition fuse burning rate of 40-50 s / m. The third-stage cylinder has an inner diameter of 25mm, an outer diameter of 30mm, and a height of 40mm, with a ignition fuse burning rate of 10-20 s / m. The ignition fuse length of each of the three cylinders is 3.5cm.

[0011] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time.

[0012] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0013] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0014] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0015] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0016] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0017] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation. Attached Figure Description

[0018] Figure 1 A schematic diagram of the external structure of the multi-stage explosion effect cylinder in the embodiment;

[0019] Figure 2 This is a schematic diagram of the internal structure of the multi-stage explosion effect cylinder in an embodiment.

[0020] Figure 3 This is a schematic diagram of the internal structure of a small firework as an example. Detailed Implementation

[0021] See appendix Figure 1-3 This describes a specific structure of the present invention. The small fireworks with multi-stage explosion effect includes a multi-stage explosion effect tube installed inside a launch tube 7. A propellant 8 is installed at the bottom of the inner cavity of the launch tube 7. A launch circular cardboard 10 with a central hole is installed above the propellant 8. The multi-stage explosion effect tube is placed above the launch circular cardboard 10. An ignition fuse 11 is connected to the propellant 8 for ignition transmission.

[0022] The multi-stage detonation effect cylinder is composed of three cylinders nested together, one above the other. The three cylinders are named from bottom to top as follows: Level 1 (bottom cylinder), Level 2 (top cylinder), and Level 3 (top cylinder). The assembly of these three cylinders is called the Level 1 assembly, and the assembly of Level 2 and Level 3 is called the Level 2 assembly.

[0023] The radial dimensions and height of the three cylinders decrease sequentially from bottom to top, causing the center of gravity of the assembly consisting of two or more cylinders to be biased towards the bottom of the assembly. In the example, the first-stage cylinder 1 has an inner diameter (diameter, the same below) of 40mm, an outer diameter of 45mm, and a height of 120mm, with a burning rate of 70-80 s / m for the first-stage ignition fuse 101; the second-stage cylinder 2 has an inner diameter of 32mm, an outer diameter of 38mm, and a height of 50mm, with a burning rate of 40-50 s / m for the second-stage ignition fuse 201; the third-stage cylinder 3 has an inner diameter of 25mm, an outer diameter of 30mm, and a height of 40mm, with a burning rate of 10-20 s / m for the third-stage ignition fuse 301; the length of the ignition fuses for all three cylinders is 3.5cm. The delay time of the ignition fuses for the three cylinders decreases by 1.05 seconds sequentially from bottom to top to ensure that low-explosion occurs.

[0024] Of the three cylinders, the lower part of the secondary cylinder 2 is nested, inserted, and glued into the upper port of the primary cylinder 1; the lower part of the tertiary cylinder 3 is nested, inserted, and glued into the upper port of the secondary cylinder 2.

[0025] All three cylinders are filled with effect drug 4. The bottom ports of the three cylinders are sealed by circular cardboard 5 with a central hole and are equipped with ignition leads. The root end of the ignition lead is buried in the effect drug 4, and the free end is led out through the central hole of the circular cardboard 5. The free end of the first-stage ignition lead 101 passes through the central hole of the launching circular cardboard 10 and is connected to the propellant 8 for ignition transmission. The free end of the second-stage ignition lead 201 is connected to the effect drug in the first-stage cylinder 1 for ignition transmission. The free end of the third-stage ignition lead 301 is connected to the effect drug in the second-stage cylinder 2 for ignition transmission.

[0026] The top port of the first-stage cylinder 1 is closed by the second-stage cylinder 2, the top port of the second-stage cylinder 2 is closed by the third-stage cylinder 3, and the top port of the third-stage cylinder 3 is provided with a sealing layer 302.

[0027] The aforementioned interlocking structure of multiple cylinders effectively prevents cylinder explosions caused by crossfire and ensures safe ignition.

[0028] In the example, to ensure that each ignition fuse is ignited by the propellant 8 or the effect drug 4, an ignition powder 9 is provided on the bottom surface of each cylinder (below the round cardboard 5).

[0029] The structure of each cylinder that makes up the multi-stage explosion effect cylinder is the same as that of the existing inner cylinder. There is no need to set other auxiliary structures (such as tail fins and conical arrows). It can be batch processed and assembled into multi-stage explosion effect cylinders according to the existing production method of the inner cylinder. It is compatible with the existing production process and is easy to produce.

[0030] During production, the primary assembly is loaded into launch tube 7. During ignition, the propellant 8 is ignited by the ignition fuse 11. The propellant 8 burns and generates gas, which propels the primary assembly into the air through the launch disc 10. The ignition fuse 101 of the primary tube 1 is ignited by the propellant 8 and enters the delay phase. Since the center of gravity of the primary assembly is biased towards the bottom of the assembly, the primary assembly forms a bottom-down posture under the action of air resistance during flight. The ignition fuse 101, which completes the delay, ignites the effect drug of the primary tube 1. When the effect drug explodes, it pushes the secondary assembly upward and ignites the ignition fuse 201 of the secondary tube 2.

[0031] Similarly, when the secondary assembly is flying in the air, it also forms a bottom-down posture due to air resistance; when the secondary cylinder 2 explodes, it pushes the tertiary cylinder 3 upward and ignites the fuse 301 of the tertiary cylinder 3. The tertiary cylinder 3 then explodes.

[0032] As can be seen from the above, the above technical solution can produce three explosions and corresponding fireworks effects, effectively enriching the display effect; it can ensure that the secondary assembly and the tertiary cylinder 3 are pushed upward to avoid the danger of low-explosion.

[0033] In other embodiments, combinations of four or five cylinders are also possible, and will not be described in detail here.

[0034] In this invention, the adhesive, effect drug 4, propellant 8, and ignition drug 9 between each stage of the cylinder can be formulated using known formulations as needed. As an example, the adhesive and drug formulations used in the embodiments are described below:

[0035] In the example, the adhesive used for bonding consists of the following components in the indicated weight ratios: 50% vinyl acetate; 20% phenolic resin; 10% talc; 10% sodium hydroxide; and 10% hydrochloric acid.

[0036] The method for preparing the adhesive includes the following steps:

[0037] S1 raw material pretreatment: Talc powder is passed through a 200-mesh sieve to ensure uniform particle size; phenolic resin is preheated to 40-50℃ to reduce viscosity; sodium hydroxide is prepared into a 10% aqueous solution.

[0038] S2 mixing: Add vinyl acetate to a stirred reactor, slowly add phenolic resin, maintain the temperature at 60-70℃, and add sodium hydroxide solution;

[0039] S3 reaction control: Heat to 80-85℃, react for 1-2 hours, and stir continuously at a speed of 300-400 rpm; monitor pH changes and control pH within the range of 8-9;

[0040] Adding S4 filler: After cooling to 60℃, add talc powder and disperse at high speed of 1000-1200 rpm for 30 minutes to ensure uniform dispersion of the filler;

[0041] S5 Neutralization and Adjustment: Slowly add a 10% hydrochloric acid solution to adjust the pH to 6-7, controlling the acid addition rate to prevent local overheating.

[0042] S6 post-processing: filtration to remove undispersed particles, vacuum degassing (pressure ~0.08MPa, 30 minutes), viscosity test before filling (Brookfield viscometer, 25°C).

[0043] The adhesive formulation provides good adhesion under static load, ensuring the overall flight of the assembly; upon the combustion and detonation of the effect drug, it makes the detonating cylinder relatively easy to detach from the other inner cylinders. This is likely because the impact load allowed by the adhesive surface is compatible with the impact force of the effect drug combustion and detonation within the inner cylinder.

[0044] Propellant: 30% pine charcoal, 40% potassium nitrate, 30% sulfur.

[0045] Ignition compound: 60% military powder, 20% potassium perchlorate, 10% alloy powder, and 10% phenolic resin.

[0046] The primary tube-shaped effect drug uses the Jin Guan green flash effect:

[0047] Jin Guan: 50% military powder, 30% pine charcoal, 5% strong adhesive powder, 15% potassium perchlorate.

[0048] Green flash: Potassium perchlorate 5%, barium nitrate 60%, premium alloy 25%, nano ethylene 10%, sulfur 5%.

[0049] Secondary cylindrical effect drugs use the Gold Crown effect:

[0050] Golden Crown: 30% pine charcoal, 5% potassium perchlorate, 40% military powder, 5% sulfur, 20% yellow titanium 140-180 mesh.

[0051] The third-level cylindrical effect drug uses the effect of red coconut:

[0052] Red Coconut: Potassium perchlorate 40%, alloy powder 20%, strontium carbonate 20%, resin 6%, enamel 4%, polyvinyl chloride 10%.

[0053] The combination of high and low delay effects creates a better viewing experience for the fireworks display.

[0054] Appendix: Setting the length of the burn-through lead in the prior art.

[0055] Initial velocity determines the ceiling: The effect tube gains an initial velocity (v0) through the explosion of the propellant, and undergoes uniformly decelerated motion under the influence of gravity (g) and air resistance (F = 0.25mg). The maximum height h satisfies:

[0056] For example, the theoretical ceiling of an effect tube with an initial velocity of 35 m / s is approximately 49 m.

[0057] Burning speed control of delayed lead: The delayed lead burns at a constant speed (e.g., 2cm / s, 50s / m), and its length (l) is related to the delay (t) as follows: l = v × t.

[0058] To ensure the combustion time t matches the time it takes for the effect tube to reach the target height, the height-delay correspondence is as follows: For example, if the theoretical liftoff is 49m, and the explosion is required to occur at 96% altitude (47.04m), the remaining velocity at this point is calculated to be v = 7m / s, corresponding to a flight time difference Δt = 2.8s. Therefore, at least 5.6cm of fuse wire (2cm / s × 2.8s) is required. Based on the error compensation mechanism, a 20% margin is reserved in the actual design; therefore, the fuse wire is set to 7cm.

[0059] The embodiments of the present invention disclosed above are merely illustrative of the present invention. The embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific implementations described. Obviously, many modifications and variations can be made based on the content of this specification. This specification selects and describes these embodiments in detail with reference to the accompanying drawings to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present invention. Therefore, the present invention is limited only to the claims and their full scope and equivalents, and not to the specific embodiments disclosed.

Claims

1. A small garden firework having a multi-stage burst effect, characterised in that, The device includes a multi-stage detonation effect tube installed inside a launch tube. The multi-stage detonation effect tube is composed of 3 to 5 tubes that are nested together in sequence. The radial dimensions and height of each tube decrease sequentially from bottom to top, and the center of gravity of the assembly consisting of two or more tubes is biased towards the bottom of the assembly. The lower part of the upper tube is nested and glued into the upper port of the lower tube. Each tube is filled with effect explosives, and the bottom port of the tube is sealed and fitted with a ignition fuse. The ignition fuse of the lowest tube is connected to the propellant in the launch tube for ignition transmission, and the ignition fuses of the other tubes are connected to the effect explosives in the lower tube for ignition transmission.

2. A small garden firework having a multi-stage burst effect as claimed in claim 1, characterised in that, The delay time of the fire-fighting fuses in each cylinder decreases sequentially from bottom to top.

3. A small garden firework having a multi-stage burst effect as claimed in claim 1, characterized in that, The delay time of the fire-fighting fuses in each cylinder decreases by 0.8 to 1.2 seconds from bottom to top.

4. A small firework with a multi-stage explosion effect as described in claim 1, characterized in that, The delay time of the fire-fighting fuses in each cylinder decreases by 0.9 to 1.1 seconds from bottom to top.

5. A small firework with a multi-stage explosion effect as described in claim 1, characterized in that, The multi-stage detonation effect cylinder is composed of a first-stage cylinder, a second-stage cylinder, and a third-stage cylinder, which are nested together sequentially. The first-stage cylinder has an inner diameter of 40mm, an outer diameter of 45mm, and a height of 120mm, with a ignition fuse burning rate of 70-80 s / m. The second-stage cylinder has an inner diameter of 32mm, an outer diameter of 38mm, and a height of 50mm, with a ignition fuse burning rate of 40-50 s / m. The third-stage cylinder has an inner diameter of 25mm, an outer diameter of 30mm, and a height of 40mm, with a ignition fuse burning rate of 10-20 s / m. The ignition fuse length of each of the three cylinders is 3.5cm.

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