COMPRESSION MOLDED COMBINED FIREWORK

Field of the Invention

The disclosure relates to an entertainment fireworks product, and more particularly to a kind of combination fireworks.

Background of the invention

According to the definitions of normative documents including national standards GB10631-2004 Fireworks and Firecracker Safety and Quality and GB19593-2004 Fireworks and Firecracker Combination Fireworks of the People's Republic of China, combination fireworks are fireworks products combined by multiple single tubes. A single tube is called a shot. Traditional combination fireworks are assembled by multiple paper tubes with various processes, low production efficiency, and low product standards etc.

In recent years, our company has developed a kind of one-step integrally-formed combination fireworks molded by paste. A finished fireworks body has a similar shape and structure with traditional combination fireworks. Generally, the overall appearance of the main body of the finished fireworks body is shaped as a rounded-corner prism or a cylinder etc. Several parallel tubular cavities are uniformly distributed on the main body. The structures and functions of the tubular cavities are similar to those of the single tubes of traditional fireworks. The upper ports of the tubular cavities are open and the lower ports of the tubular cavities are sealed. Drugs for launching fireworks and effect members are accommodated in the tubular cavities. The igniting mode, which applies a bottom fuse igniting structure, is different from the lateral fuse igniting structure of traditional combination fireworks. The sealed ends of the tubular cavities are provided with igniting holes penetrating the bottom of the main body and the bottom is provided with a fuse groove that connects the bottom openings of the igniting holes to protect and locate a fuse. The fuse is embedded in the fuse groove and connected to each igniting hole to ignite the drugs for launching fireworks through the igniting holes. For the manufacture technique, please refer to Chinese patent whose authorized publication number is CN 101377395B, entitled Compression-molded Fireworks External Tube, Display Shell Spherical Casing and Manufacture Thereof published on April 11 th, 2012.

However, it's found in practice that this kind of one-step integrally-formed combination fireworks still has some disadvantages, especially flame propagation which is caused easily, i.e. the gunpowder and effect member in each tubular cavity are not ignited and launched in turn by the fuse according to the blast-off procedure. Instead, two or more tubular cavities are launched almost at the same time, which completely damages the blast-off effect.

Summary of the invention

To solve the disadvantages above, the technical problem to be solved by the disclosure is to provide a compression-molded combination fireworks to effectively prevent flame propagation and ensure successful implementation of the designed blast-off effect. To solve the technical problem above, the disclosure applies the following technical solution: a compression-molded combination fireworks, including a number of parallel tubular cavities uniformly disposed in a main body. The upper ports of the tubular cavities are open and the lower ports of the tubular cavities are sealed. Drugs for launching fireworks and effect members are accommodated in the tubular cavities. The sealed ends of the tubular cavities are provided with igniting holes penetrating the bottom of the main body, and the bottom openings of the igniting holes are located in a fuse groove. A cut-off groove is set between the bottom openings of the igniting holes in the fuse groove and the fuse groove is sealed by glue.

It is found in our studies that flame propagation is caused by the following reasons: after the fuse is embedded into the fuse groove, there are gaps between the side walls and the bottoms of the fuse and the fuse groove. The continuous gaps within a section of the fuse groove may cause flame propagation between the igniting holes in the gaps. Since the advancing speed of burning high-pressure gunpowder gases along the fuse groove is higher than the burning speed of the fuse, the gunpowder gases enter the igniting holes through the gaps to ignite the launching gunpowder and the effect members in the tubular cavities disorderly.

The fuse groove is sealed by the glue to reduce flame propagation. The glue may apply commercial products from various markets of fireworks materials, e.g. moisture barrier etc. In order to improve the flame blocking performance and provide better flow distribution and adhesion performance, the components of the glue preferably include: based on parts by weight, 1 to 2 parts of moisture barrier and 2 to 4 parts of calcium-magnesium powder mixed uniformly according to a conventional method.

However, since the glue distribution can be hardly matched with the gaps completely, and there may still be gaps, especially those between the fuse and the bottom of the fuse groove. Therefore, a cut-off groove deeper than the fuse groove is further set in the fuse groove and is set between the bottom openings of the igniting holes, so that the glue is enabled to form a closed ring easily along the direction of the cross section of the fuse in the fuse groove to cut off the passages through which gunpowder gases advance along the gaps to eliminate flame propagation. At the same time, all paths that allow the high-pressure burning gunpowder gases to burst out of the igniting holes to cause accidents are blocked, and the gunpowder gases in all tubular cavities are restrained and can only burst out from the openings of the upper ends of the tubular cavities, thus effectively avoiding loss of launching energy, ensuring the safety of the product, normalizing the use amount of the gunpowder and improving the blast-off quality.

It can be learned from the analysis above that the cut-off groove may be set integrally (for example, set in a U shape along the cross section of the inner cavity wall of the fuse groove) or partially (for example, set along a certain part of the cross section of the inner cavity wall of the fuse groove). The length, width and depth of the cut-off groove may be adjusted according to actual conditions. However, combining the cut-off performance and the requirements of the manufacture techniques, the cut-off groove is preferably set at the bottoms of the inner cavities of the fuse groove. Preferably, the width of the cut-off groove is greater than the width of the fuse groove. Preferably, the cut-off groove is rectangular blind hole.

Preferably, the sealed end of each of the tubular cavities is provided with an igniting hole penetrating the bottom of the main body. The fuse groove is a continuous integral groove and the bottom opening of each igniting hole is located in the integral groove. The cut-off groove is located between the bottom openings. In use, it only needs to embed a complete fuse in the fuse groove to satisfy the igniting requirements. It is unnecessary to insert a fuse in each igniting hole separately. The burning gas spark generated by the combustion of the fuse in the fuse groove enters the tubular cavities via the igniting holes to ignite the launching gunpowder and the effect members.

Since the bottom of the main body of some products is relatively thick, the igniting holes are relatively long in the axial direction, after the fuse is ignited, the fuse spark is not high enough to reach the launching gunpowder through the igniting holes, and the launching gunpowder in the tubular cavities cannot be ignited to severely influence the blast-off effect. In order to avoid the situation above, the igniting hole is preferably taper hole with a cone node in the bottom direction of the main bodyand with a cone bottom in the bottom direction of the tubular cavity, so that the launching gunpowder can fall along the funnel-shaped taper hole to be closer to the fuse to enable the spark of the ignited fuse to completely contact the launching gunpowder and ensure that there will be no ignition failure.

Preferably, the corners of the continuous integral groove are set as circular arc corners, thus reducing the folding of the fuse at the corners, preventing abrasion or rupture of the fuse during folding and avoiding quality problem of the product caused by fuse rupture.

Preferably, the sealed end of each of the tubular cavities is provided two igniting holes penetrating the bottom of the main body, one of which is a fuse inlet hole and the other one is a fuse outlet hole. The fuse groove includes multiple distributed grooves set at intervals. In all the igniting holes, excepting the fuse inlet hole connected to an igniting fuse and the fuse outlet hole connected to a backup igniting fuse, the bottom openings of a fuse inlet hole of a tubular cavity and the fuse outlet hole of another neighboring tubular cavity are located in a same distributed groove. The cut-off groove is located between the two bottom openings. In use, multiple fuses are prepared according to the number of the distributed grooves and it only needs to insert the two ends of each fuse into the fuse inlet and the fuse outlet in the groove.

Preferably, the periphery of the bottom of the main body is provided with a frame formed by lug bosses. A plurality of slots for ventilation and pressure relief set on the frame. The frame formed by the lug bosses lifts the bottom of the main body of the combination fireworks off the ground to prevent moisture and damage. At the same time, the slot for ventilation and pressure relief ventilates the bottom to speed up the drying process of the product on one hand. On the other hand, the gas pressure can be released timely in the case that the gunpowder gases leak from the bottom of the fireworks, avoiding toppling of the combination fireworks to prevent more serious accidents.

The disclosure will be further described below in combination with the accompanying drawings and embodiments.

Brief description of the drawings

• Fig. 1 is a schematic diagram illustrating an external integral view of the first embodiment;
• Fig. 2 is a structural diagram illustrating the bottom of a main body of the first embodiment;
• Fig. 3 is a schematic diagram illustrating a sectional structure of the first embodiment;
• Fig. 4 is a structural diagram illustrating the bottom of a main body of the second embodiment;
• Fig. 5 is a schematic diagram illustrating a sectional structure of the second embodiment (without fuse and glue);
• Fig. 6 is a schematic diagram illustrating a sectional structure of the second embodiment (with fuse and glue);
• Fig. 7 is a schematic diagram illustrating an external integral view of the third embodiment;
• Fig. 8 is a structural diagram illustrating the bottom of a main body of the third embodiment; and
• Fig. 9 is a schematic diagram illustrating the bottom of a main body of the fourth embodiment.

Detailed description of the embodiments

Embodiment 1: Fig. 1 to Fig. 3 show a specific structure of the disclosure, which is a kind of 88-shot combination fireworks integrally molded through compression in one step. The compression-molded combination fireworks include: 88 parallel tubular cavities 2 uniformly distributed on a main body 1. The upper ports 3 of the tubular cavities 2 are open and the lower ports 4 of the tubular cavities are sealed. Drugs for launching fireworks and effect members are accommodated in the tubular cavities 2. The sealed ends of the tubular cavities 2 are provided with igniting holes 5 penetrating the bottom of the main body 1 and the bottom openings 6 of the igniting holes 5 are located in a fuse groove 7. A cut-off groove 8 is set between the bottom openings 6 of the igniting holes 5 in the fuse groove 7 and the fuse groove 7 is installed with a fuse 10 and sealed by glue 9. The components of the glue are: based on parts by weight, 1.2 parts of moisture barrier and 3 parts of calcium-magnesium powder mixed uniformly according to a conventional method. The cut-off groove 8 is set at the bottom of the inner cavity of the fuse groove 7. The cut-off groove 8 is rectangular blind hole whose width is larger than the width of the fuse groove 7. The periphery of the bottom of the main body 1 is provided with a frame 12 formed by lug bosses and six slots for ventilation and pressure relief13 are set on the frame 12.

In the present embodiment, each tubular cavity 2 is provided with an igniting hole 5, as shown in Fig. 2. The fuse groove 7 is a continuous integral groove and the corners 11 thereof are set as circular arc corners. The bottom openings 6 of the 88 igniting holes 5 are located in the fuse groove 7. The cut-off groove 8 is located between the bottom openings 6. In use, it only needs to embed a complete fuse 10 in the fuse groove 7. The two ends of the fuse 10 are guided out to the top surface of the main body 1 through the lateral fuse grooves 14 of the main body 1 to function as an igniting fuse and a backup igniting fuse respectively. The igniting hole 5 is a taper hole with a conic node in the bottom direction of the main body 1 and with a cone bottom in the internal bottom direction of the tubular cavity 2.

It can be seen that the cut-off groove 8 is set between the bottom openings 6 of two igniting holes 5 to enable the glue 9 to form a closed ring easily along the direction of the cross section of the fuse 10 in the fuse groove 7 to cut off the passages through which gunpowder gases advance along the gaps.

Embodiment 2: Fig. 4 to Fig. 6 show another specific structure of the disclosure, which is a kind of 25-shot combination fireworks integrally molded through compression in one step. Similarly, the compression-molded combination fireworks include: 25 parallel tubular cavities 102 uniformly distributed on a main body 101. The upper ports of the tubular cavities 102 are open and the lower ports of the tubular cavities are sealed. Drugs for launching fireworks and effect members are accommodated in the tubular cavities 102. The sealed ends of the tubular cavities 102 are provided with igniting holes 105 penetrating the bottom of the main body 101 and the bottom openings of the igniting holes 105 are located in a fuse groove 103. A cut-off groove 104 is set between the bottom openings of the igniting holes 105 in the fuse groove 103 and the fuse groove 104 is installed with a fuse 106 and sealed by glue. The cut-off groove 104 is set at the bottom of the inner cavity of the fuse groove 103. The cut-off groove 104 is rectangular blind hole. The periphery of the bottom of the main body 101 are set with a frame 107 formed by lug bosses and four slots for ventilation and pressure relief 108 are set on the frame 107.

The difference is that, in the present embodiment, each tubular cavity 102 is provided with two igniting holes 105, one of which is a fuse inlet hole and the other one is a fuse outlet hole. The fuse groove 104 comprises 24 distributed grooves set at intervals. It can be seen from Fig. 4 that there are 50 igniting holes 105 in total. Excepting the fuse inlet hole 109 connected with an igniting fuse and the fuse outlet hole 110 connected with a backup igniting fuse, the other 48 igniting holes are paired into 24 groups, with a fuse inlet hole and a fuse outlet hole in each group, i.e. a fuse inlet hole of a tubular cavity 102 and a fuse outlet hole of another neighboring tubular cavity 102 are paired. Two bottom openings of the igniting holes 105 in each group are located in a same fuse groove 103. The cut-off groove 104 is set between the two bottom openings. In use, multiple fuse 106 are prepared according to the number of the distributed grooves. The two ends of each fuse 106 are inserted into the fuse inlet hole and the fuse outlet hole in the groove, respectively. The ignition sequence after ignition is the igniting fuse, the fuse inlet hole 109, the launching gunpowder in the tubular cavity in which the fuse inlet hole 109 locates, the fuse outlet hole of the tubular cavity in which the fuse inlet hole 109 locates, the fuse inlet hole of the neighboring tubular cavity in turn, and the ignition is performed in such an order until the fuse outlet hole 110 and the backup igniting fuse are ignited. A reverse order is applied when the backup fuse is ignited.

It can be seen that the cut-off groove 104 is set between the bottom openings of two igniting holes 105 to enable the glue to form a closed ring easily along the direction of the cross section of the fuse 106 in the fuse groove 103 to cut off the passages through which gunpowder gases advance along the gaps.

Embodiment 3: as shown in Fig. 7 and Fig. 8, what's different from the second embodiment is that the present embodiment is a kind of 19-shot combination fireworks integrally molded through compression in one step. The main body 201 is shaped as a regular hexagon. The cut-off groove 202 is set in a similar manner to enable the glue to form a closed ring easily along the direction of the cross section of the fuse in the fuse groove 203 to cut off the passages through which gunpowder gases advance along the gaps.

Embodiment 4: similarly, Fig. 9 shows a 25-shot combination fireworks integrally molded through compression in one step. What's different from the second embodiment is that one of the tubular cavities provided with 3 igniting holes and the other one of the tubular cavities is provided with only 1 igniting hole to form different ignition sequences to satisfy the requirements of the design of the blast-off process to realize a special "volley" effect. However, cut-off groove is set in the fuse groove similarly to enable the glue to form a closed ring easily along the direction of the cross section of the fuse in the fuse groove to cut off the passages through which gunpowder gases advance along the gaps.

The above embodiments described in the disclosure are only used for illustrating the technical solution of the disclosure clearly and should be understood as any limitations to the disclosure. The disclosure has various known replacements and transformations, such as main body shapes, settings of ignition or distribution of fuse grooves etc. and they shall fall into the protection scope of the disclosure without departing from the substantial meaning of the disclosure.