Device for launching fireworks

A device for launching fireworks, the device includes: a plastic plug and a locking base. The plastic plug includes: a resistance heating wire, a slot for accommodating the resistance heating wire, two metal conductors, two plate-like electrodes, and an upper clamping structure. The locking base includes: a lower clamping structure, two spring electrodes, and a circuit connecting socket. The top of the plastic plug is provided with the slot for accommodating the resistance heating wire. The resistance heating wire is fixed in the slot for accommodating the resistance heating wire and two ends of the resistance heating wire are electronically connected with one ends of the two metal conductors. The other ends of the two metal conductors are respectively electronically connected with the two plate-like electrodes and fixed at a bottom of the plastic plug. The bottom of the plastic plug is provided with the upper clamping structure.

BACKGROUND OF THE INVENTION

Field of the Invention

The invention relates to a device for launching fireworks.

Description of the Related Art

A device for launching single shot fireworks typically adopts an electric igniter that ignites a lifting charge. However, firing holes of the single shot fireworks are either too large or too small, the launching force of the lifting charge does not fully act on the projection of the fireworks and parts of the energy produced when the lifting charge is ignited leaks from the firing holes, all which results in a variable, and often insufficient launch height and imprecise launch angle. Although additional lifting charges can be added to solve this problem, this makes the product more dangerous. In addition, the assembly of the electric igniter and the launching device is laborious, and the fixation mode of the fireworks is time-consuming.

SUMMARY OF THE INVENTION

In view of the above-described problems, it is one objective of the invention to provide a device for launching fireworks. The device ensures the full energy of the lifting charge act on the projection of the firework, possesses higher safety, reliable and stable performance, convenient use, and is adapted to save the amount of the lifting charges.

To achieve the above objective, in accordance with one embodiment of the invention, there is provided a device for launching fireworks. The device comprises: a plastic plug and a locking base. The plastic plug comprises: a resistance heating wire, a slot for accommodating the resistance heating wire, two metal conductors, two plate-like electrodes, and an upper clamping structure. The locking base comprises: a lower clamping structure, two spring electrodes, and a circuit connecting socket. A top of the plastic plug is provided with the slot for accommodating the resistance heating wire. The resistance heating wire is fixed in the slot for accommodating the resistance heating wire and two ends of the resistance heating wire are electronically connected with one ends of the two metal conductors. The other ends of the two metal conductors are respectively electronically connected with the two plate-like electrodes and fixed at a bottom of the plastic plug. The bottom of the plastic plug is provided with the upper clamping structure. The locking base is provided with the lower clamping structure. The upper clamping structure and the lower clamping structure are clamped together to lock the plastic plug to the locking base. A top of the locking base is provided with the two spring electrodes, and the two spring electrodes are respectively aligned with the two plate-like electrodes of the plastic plug to form an electric connection. The circuit connecting socket is fixed on the locking base and electrically connected to the spring electrodes.

In a class of this embodiment, the top of the plastic plug is a concave structure having a rim part higher than a middle part; and the slot for accommodating the resistance heating wire is positioned at a bottom of the concave structure of the plastic plug.

In a class of this embodiment, the resistance heating wire is coated with a metal layer adapted to be soldered.

In a class of this embodiment, the resistance heating wire is coated with an anti-oxidation protective mask operating to fix the resistance heating wire onto the circuit board.

In a class of this embodiment, the plastic plug is provided with a locking slot; the locking base is provided with a locking lever, and the locking lever is locked in the locking slot.

In a class of this embodiment, the locking base is at least one in number, and the locking bases are integrated to form a unit.

In a class of this embodiment, the locking base is provided with multiple lower clamping structures having different diameters and independent from one another.

In a class of this embodiment, the resistance heating wire is in a coiled configuration having excellent electro-thermal conversion capability.

The resistance wire is fixed in place by coating an anti-oxidation protective mask, which can effectively avoid direct contact between the resistance wire and the lifting charge. The mask is very thin and easy to burn, bringing no influence to the ignition performance of the resistance wire. The anti-oxidation protective mask glues and fixes the resistance wire to the circuit board. The mask possesses structural property to withstand any abrasive contact from the lifting charge. The top of the plastic plug is in the concave structure having the rim higher than the middle part and the slot for accommodating the resistance heating wire is positioned at the bottom of the concave structure. Lifting charge filled into the bottom plug accumulates at the bottom of the concave structure to ensure a good contact with the resistance wire located in the center of the bottom of the concave structure. Meanwhile, the concave structure facilitates the bursting energy of the lifting charge to be concentrated and focused towards the middle thereby achieving greater height projection. The slot for accommodating the resistance heating wire of the plastic plug has a through slot leading to the bottom. The circuit board with the resistance heating wire and the metal conductors soldered thereon is placed into the slot for accommodating the resistance heating wire, where the resistance heating wire is positioned upwards and the two metal conductors are positioned downwards fixed into the through slot. The circuit board is fixed and the through slot is sealed by adhesive. The bottom of the metal conductors is soldered to the two plate-like electrodes, these electrodes face downwards. The bottom of the concave structure of the plastic plug is provided with structural ribs; these ribs improve the structural performance of the plastic plug together with the wall of the through slot. The upper clamping structure on the plastic plug corresponds to the lower clamping structure of the locking base. When loading, the plastic plug is clamped onto the locking base, the two spring electrodes on the locking base are pressed down to make reliable contact with the two plate-like electrodes of the plastic plug. At the same time, the spring locking lever on the locking base is sited in the locking slot of the plastic plug, thus preventing the plastic plug from being disengaged from the locking base by vibrations caused by launching other fireworks.

During the assembly, the plastic plug pre-installed with the resistance heating wire is inserted into a firework tube and is fixed by means of glue, adhesives, staples or nails. Then lifting charge, paper disk with holes, firework effect components are filled in and a paper disk is used to seal.

In use, the locking base equipped with the spring electrodes and the circuit connecting socket is positioned onto a board at a variety of different angles. The spring electrodes on the locking base are connected to a firing system via a cable with corresponding plugs. The single-shot firework equipped with the plastic plug is clamped and fixed to the lower clamping structure of the locking base along the upper clamping structure. The spring electrodes on the locking base are compressed to make reliable contact with the plate-like electrodes on the plastic plug. The resistance heating wire is connected to the firing system along the metal electrodes, the plate-like electrodes, the spring electrodes, the circuit connecting socket and the cable. During launching of the single shot firework, the firing system conducts current to the resistance heating wire which instantly heat up to ignite the lifting charge by direct contact, thereby launching the single shot firework.

Advantages of the device for launching fireworks according to embodiments of the invention are summarized as follows:

Compared with conventional single shot fireworks, the cavity for the lifting charge is completely sealed, and the concave structure of the plastic bottom plug creates maximum energy from the lifting charge to project the firework effects. Thus, the same projecting height can be achieved by using half of the lifting charge, which reduces the product weight, reduces smoke, reduces the shooting noise, increases safety, and has stable and reliable performance. The pre-installed resistance heating wire has no dangerous components which can misfire by friction or impact, so that safety is ensured in production, storage, transportation, and use. The locking base can be used repeatedly, thus increasing the utilization of resources and reducing the usage cost. The device of the invention is simple and fast to assemble and operate. Precise-angle assembly of multiple single-shot fireworks can be achieved simply by adjusting the angle of the flat board where the locking base is fixed. Reliable electrical connection can be achieved by clamping and fixing the single shot fireworks on the locking base which significantly saves labor.

DETAILED DESCRIPTION OF THE EMBODIMENTS

For further illustrating the invention, experiments detailing a device for launching fireworks are described below. It should be noted that the following examples are intended to describe and not to limit the invention.

As shown inFIGS. 1-3, a top of a plastic plug1is a concave structure having a rim higher than a middle part thereof, and a bottom of the concave structure is provided with a slot4for accommodating a resistance heating wire3. A bottom part of the plastic plug1is provided with a through slot16passing through the slot4for accommodating the resistance heating wire and a bottom of the plastic plug1. In this embodiment, a circuit board is used as a circuit board15, two pins are used as metal conductors12, and a circuit board provided with two separate large-area bonding pads is used as plate-like electrodes13. Two ends of the resistance heating wire3are respectively electrically connected to the two pins12and fixed onto the circuit board15. The resistance heating wire3is in a coiled configuration having excellent electro-thermal conversion capability. The resistance heating wire3is coated with a metal layer adapted to be soldered, and is also coated with an anti-oxidation protective mask operating to fix the resistance heating wire3onto the circuit board15. The circuit board15is fixed in the slot4for accommodating the resistance heating wire by an adhesive and the resistance heating wire3faces upwards. The two pins12faces downwards and are positioned in the through slot16. In a lower portion of the through slot16, the two plate-like electrodes13are respectively electrically connected to the two pins12. An edge at the bottom of the plastic plug1is provided with an upper clamping structure17. The bottom of the plastic plug1is provided with a locking slot11, and the bottom of the plastic plug1is provided with a structural rib14.

As shown inFIG. 2-3, the resistance heating wire3serves as the ignition method, two ends of the resistance heating wire3and the two pins12are electronically connected respectively and are soldered onto the circuit board15. The resistance heating wire3is in a coiled configuration having excellent electro-thermal conversion capability. For the resistance heating wire3having poor soldering performance, reliability is improved by electroplating a coating of metal adapted to be soldered, and the circuit board15where the resistance heating wire3is soldered is further coated with a nitrocellulose varnish to protect the resistance heating wire3. The top of the plastic plug1is the concave structure having the rim higher than middle part, and the slot4for accommodating the resistance heating wire is located at a lowest part in the middle of the concave structure. Walls of the through slot16together with the structural rib14are used to improve the structural performance of the plastic plug1.

The circuit board15where the resistance heating wire3and the pins12are soldered is placed into the slot4for accommodating resistance heating wire of the plastic plug1to allow both the resistance heating wire3and the two pins12to be fixed in the through slot6with the resistance heating wire3facing upwards and the two pins12facing downwards. The circuit board15is fixed in the slot for accommodating the resistance heating wire4via glue.

In the bottom of the through slot16, a circuit board provided with two plate-like electrodes13is soldered to the other ends of the two pins12, and the plate-like electrodes13faces downwards.

As shown inFIG. 4, an upper portion of the locking base2is provided with multiple lower clamping structures8having different diameters and independent from one another. The lower clamping structures8are correspondingly connected to the upper clamping structure7of the plastic plug1. The locking base2is provided with two spring electrodes5. In this embodiment, the spring electrodes5are formed by soldering a copper column on a spring, a part of the copper column in contact with the plate-like electrodes13of the plastic plug1is optionally gold-plated or provided with a stainless steel cap to prevent oxidization. The spring is soldered onto a circuit board. In this embodiment, four locking bases4are joined up in a line to form a whole. Two sides of each locking base4are provided with screw fixing holes9. In this embodiment, two RJ45 network sockets serving as circuit connecting socket10are soldered onto the circuit board, which are respectively located on sides of two ends of the locking base2, and the locking base2is provided with a spring locking lever7.

As shown inFIG. 5, when a single-shot firework is assembled, the plastic plug1is inserted into a tube19of the single-shot firework, the tube19is fixed with the plastic plug1by adhesives or nails. A lifting charge21is filled in from the other end of the tube19and falls into the concave structure in the top of the plastic plug1, so that the lifting charge is in good contact with the resistance heating wire3. Then a paper disk20with holes, effect components18, and sealed paper disk are sequentially filled in.

In use, the locking base2is first fixed on a board at different angles along the screw fixing holes9, which is inserted into the RJ45 socket10through a CATS cable. The spring electrodes5on the locking base is led out and connected to any firing system. The single-shot firework equipped with the plastic plug1is clamped and fixed to the lower clamping structure18of the locking base2along the upper clamping structure17of the plastic bottom plug1. The locking lever7on the locking base2is secured within the locking slot11of the plastic plug1. The spring electrodes5on the locking base2are pressed to make reliable contact with the plate-like electrodes13on the plastic plug1. The circuit of the resistance heating wire3is connected to the firing system along the metal conductors12, the plate-like electrodes13, the spring electrodes5, the circuit connecting socket20and the cable. During ignition of the firework, the firing system conducts current into the resistance heating wire3and instantly heats up to ignite by direct contact with the lifting charge21, thereby launching the single-shot firework.