A fireworks

Abstract

The present invention provides a fireworks, belonging to the technical field of salute supplies. It solves the problem that the existing fireworks are prone to flashover. This fireworks includes a bottom plate and an outer cylinder having a plurality of launch chambers. One end of the launch chamber is open, and the other end has a bottom. Each bottom of the launch chamber is provided with an access hole and an outlet hole. The bottom of the outer cylinder is also provided with a wiring groove. Along the ignition direction, for every two adjacent launch chambers, the outlet hole of the previous launch chamber is communicated with the access hole of the next launch chamber through the wiring groove. A rib protruding from the bottom plate is provided and is matched with the wiring groove. The bottom plate is connected to the bottom of the outer cylinder and can cover the wiring groove. The rib is embedded in the wiring groove and the outer side wall of the rib is in close contact with the inner side wall of the wiring groove. The rib can press the lead wire against the bottom wall of the wiring groove. It is equivalent to cutting off the path of the high-pressure gunpowder gas generated after the gunpowder is ignited from flushing into the wiring groove and then flashing over to both sides, avoiding the phenomenon of flashover of the fireworks.

Description

Technical Field

[0001] The present invention belongs to the technical field of salute supplies and relates to a fireworks. Background Art

[0002] Fireworks, also known as "pyrotechnics", use gunpowder to produce effects such as sound, light, and color through combustion or explosion. Fireworks are entertainment products for viewing and are widely used in grand ceremonies, performances, or festival activities.

[0003] Currently, common fireworks on the market usually include an inner cylinder and an outer cylinder. Multiple launch chambers are provided on the outer cylinder. The depth of the launch chamber is greater than the height of the inner cylinder. An inner cylinder is respectively arranged in each launch chamber. A pressurized air chamber is formed between the bottom end of the inner cylinder and the bottom surface of the launch chamber. The pressurized air chamber is used to fill the gunpowder for launching the inner cylinder. A fuse for igniting the gunpowder in the pressurized air chamber is also provided on the outer cylinder. Effect gunpowder is arranged in the inner cylinder. Through the ignition of the fuse, the inner cylinders in each launch chamber are launched at intervals in sequence.

[0004] To facilitate the arrangement of the fuse, in the existing fireworks, a wiring groove for the fuse to be embedded is provided at the bottom of the outer cylinder. An access hole for the fuse to penetrate into and an exit hole for the fuse to penetrate out are respectively opened at the bottom of each launch chamber. Along the ignition direction, in every two adjacent launch chambers, the exit hole of the previous launch chamber is communicated with the access hole of the next launch chamber through the wiring groove, so that the wiring groove is roughly in a serpentine structure. Then, a layer of BOPP film is covered at the bottom of the outer cylinder. The wiring groove can be a continuous serpentine structure groove, such as an integral combined fireworks disclosed in a Chinese patent application (application number: 200910043964.3). The wiring groove can also be a discontinuous serpentine structure composed of multiple strip-shaped short grooves spliced together, such as a combined fireworks disclosed in a Chinese patent application (application number: 200910043962.4).

[0005] When the fireworks are used, after the fuse is ignited, the sparks burn in sequence along the serpentine direction, thereby sequentially igniting the gunpowder in the pressurized air chamber of the launch chamber, so that the inner cylinders in each launch chamber are launched at intervals in sequence and explode in the air, producing effects such as sound, light, and color. However, the fireworks have the following defects: after the gunpowder in the pressurized air chamber of the launch chamber is ignited, the burning high-pressure gunpowder gas will recoil into the wiring groove and diffuse to both sides along the gap between the wiring groove and the bottom film layer. Since the advancing speed of the burning high-pressure gunpowder gas along this gap is faster than the burning speed of the fuse, the burning high-pressure gunpowder gas will instantly rush into the access hole or exit hole of the adjacent launch chamber and ignite the gunpowder in the launch chamber, resulting in a fire-causing phenomenon, so that the gunpowder in each launch chamber is not ignited and launched in sequence according to the extension order of the fuse, and the situation that two or more launch chambers are launched almost simultaneously occurs, making the viewing effect of the fireworks display poor.

[0006] In order to prevent the occurrence of flashover, the existing conventional method is as follows: by filling glue in the wiring groove, a closed ring is formed along the cross-section direction of the lead wire to wrap the lead wire, so that the high-temperature gunpowder gas cannot instantly ignite all the lead wires, avoiding the occurrence of flashover. However, it has relatively high requirements for the glue filling operation. If the filling is not in place, flashover may still occur, and there is also a tendency of glue leakage during the gluing process. The glue may block the access holes and outlet holes at the bottom of the firing chamber, resulting in non-ignition, and the glued structure cannot be reused. Summary of the Invention

[0007] The object of the present invention is to address the above problems existing in the prior art and propose a fireworks. The technical problem to be solved by the present invention is: how to solve the problem that the existing fireworks are prone to flashover.

[0008] The object of the present invention can be achieved by the following technical solutions: A fireworks, comprising an outer cylinder having a plurality of firing chambers. One end of each firing chamber is open, and the other end has a bottom. Each bottom of the firing chambers is provided with an access hole and an outlet hole respectively for the lead wire to access and exit. The bottom of the outer cylinder is also provided with a wiring groove for the lead wire to be embedded. Along the ignition direction, for every two adjacent firing chambers, the outlet hole of the previous firing chamber is communicated with the access hole of the next firing chamber through the above-mentioned wiring groove. It is characterized in that the fireworks further comprises a bottom plate, a convex strip matching the wiring groove is protrudingly provided on the bottom plate, the bottom plate is connected to the bottom of the outer cylinder and can cover the wiring groove, the convex strip is embedded in the wiring groove and the outer side wall of the convex strip abuts against the inner side wall of the wiring groove, and the convex strip can press the lead wire against the bottom wall of the wiring groove.

[0009] In the structure of this fireworks, a bottom plate is provided at the bottom of the fireworks to cover the bottom of the fireworks, and convex strips matching the wiring grooves are protruding on the bottom plate, that is, the shape of the convex strips is the same as that of the wiring grooves. After the bottom plate is connected to the bottom of the fireworks, the convex strips can be embedded into the wiring grooves and press the lead wires tightly against the bottom wall of the wiring grooves. The lead wires themselves are flexible and can deform to both sides and press against the inner walls on both sides of the wiring grooves after being pressed tightly. At the same time, the outer side walls of the convex strips are in close contact with the inner side walls of the wiring grooves, thus eliminating the gaps between the convex strips, the lead wires and the groove walls of the wiring grooves, which is equivalent to cutting off the path for the high-pressure gunpowder gas generated after the gunpowder is ignited to rush to both sides after entering the wiring grooves, so that the high-pressure gunpowder gas cannot ignite the gunpowder in the adjacent launch chambers prior to the lead wires, avoiding the phenomenon of the fireworks having a fire rush, enabling the gunpowder in each launch chamber to be ignited and launched in sequence according to the burning order of the lead wires, and preventing the situation of multiple simultaneous launches, ensuring a good fireworks display effect and viewing pleasure. In this fireworks, the wiring grooves can also be arranged in a continuous serpentine groove structure as in the existing ones or a discontinuous serpentine structure composed of multiple spliced strip-shaped short grooves.

[0010] Moreover, the outer cylinder and the bottom plate of this fireworks can be formed by molding, enabling recycling. Just disassemble the outer cylinder and the bottom plate, refill the launch gunpowder and the inner cylinder filled with effective medicine in the launch chamber of the outer cylinder, re-arrange the lead wires in the wiring grooves, and then press the bottom plate back tightly to press the lead wires.

[0011] In the above-mentioned fireworks, the pressing surface where the convex strips are embedded into the wiring grooves to press the lead wires tightly is a plane. The flat pressing surface presses against the lead wires, causing the lead wires to deform and squeeze to both sides, pressing tightly against the inner walls on both sides of the wiring grooves, thus eliminating the gaps between the convex strips, the lead wires and the groove walls of the wiring grooves, which is equivalent to cutting off the path for the high-pressure gunpowder gas generated after the gunpowder is ignited to rush to both sides after entering the wiring grooves, so that the high-pressure gunpowder gas cannot ignite the gunpowder in the adjacent launch chambers prior to the lead wires, avoiding the phenomenon of the fireworks having a fire rush, enabling the gunpowder in each launch chamber to be ignited and launched in sequence according to the burning order of the lead wires, and preventing the situation of multiple simultaneous launches, ensuring a good fireworks display effect and viewing pleasure.

[0012] As an alternative solution, in the above-mentioned fireworks, the pressing surface where the convex strip is embedded in the wiring groove to press the lead wire is an arc surface. The pressing surface of the convex strip is an arc surface, and the shape of the pressing surface is adapted to the lead wire so as to be able to wrap the lead wire. At the same time, the outer side wall of the convex strip is in close contact with the inner side wall of the wiring groove, so that the gaps between the convex strip, the lead wire and the groove wall of the wiring groove can be better eliminated. It is equivalent to cutting off the path of the high-pressure gunpowder gas generated after the gunpowder is ignited from flushing back to the wiring groove and then spreading fire to both sides. As a result, the high-pressure gunpowder gas cannot ignite the gunpowder in the adjacent launch chambers before the lead wire, avoiding the phenomenon of fire spreading in the fireworks. The gunpowder in each launch chamber is ignited and launched in sequence according to the burning order of the lead wire, and there will be no situation of multiple simultaneous launches, ensuring a better firing effect and ornamental value.

[0013] In the above-mentioned fireworks, the bottom wall of the wiring groove is an arc surface. The shape of the bottom wall of the wiring groove is adapted to the lead wire, so that after the lead wire is pressed on the bottom wall, it can better maintain close contact with the bottom wall, and better eliminate the gaps between the convex strip, the lead wire and the groove wall of the wiring groove. It is equivalent to cutting off the path of the high-pressure gunpowder gas generated after the gunpowder is ignited from flushing back to the wiring groove and then spreading fire to both sides. As a result, the high-pressure gunpowder gas cannot ignite the gunpowder in the adjacent launch chambers before the lead wire, avoiding the phenomenon of fire spreading in the fireworks. The gunpowder in each launch chamber is ignited and launched in sequence according to the burning order of the lead wire, and there will be no situation of multiple simultaneous launches, ensuring a better firing effect and ornamental value.

[0014] In the above-mentioned fireworks, the inner side wall of the wiring groove has a convex portion protruding inward. Along the fire-leading direction, in each adjacent pair of launch chambers, the inner side wall of the wiring groove between the outgoing hole of the previous launch chamber and the incoming hole of the next launch chamber has the above-mentioned convex portion. The outer side wall of the convex strip has a recessed portion formed by inward depression, and the recessed portions correspond to the convex portions one by one, and the convex portions can be embedded in the corresponding recessed portions. The setting of the convex portions enables the lead wire to be clamped along the width direction of the wiring groove after being installed in the wiring groove. Coupled with the pressing action of the convex strip, the gaps between the convex strip, the lead wire and the groove wall of the wiring groove can be better eliminated. It is equivalent to cutting off the path of the high-pressure gunpowder gas generated after the gunpowder is ignited from flushing back to the wiring groove and then spreading fire to both sides. As a result, the high-pressure gunpowder gas cannot ignite the gunpowder in the adjacent launch chambers before the lead wire, avoiding the phenomenon of fire spreading in the fireworks.

[0015] Preferably, in the above-mentioned fireworks, along the ignition direction, in every two adjacent launch chambers, on the inner sidewalls of the wiring groove between the outlet hole of the previous launch chamber and the inlet hole of the subsequent launch chamber, there are the above-mentioned convex portions, and the convex portions on both sides are symmetrically arranged. Through the above arrangement, the lead wire has a tendency to be squeezed towards the middle at the two convex portions. Coupled with the pressing effect of the rib, the gaps between the rib, the lead wire and the groove wall of the wiring groove are better eliminated, which is equivalent to cutting off the path of the high-pressure gunpowder gas generated after the gunpowder is ignited from flushing back to the wiring groove and then spreading fire to both sides. Thus, the high-pressure gunpowder gas cannot ignite the gunpowder in the adjacent launch chamber prior to the lead wire, avoiding the phenomenon of fire spreading in the fireworks.

[0016] As a further preference, in the above-mentioned fireworks, along the ignition direction, the convex portion is arc-shaped, and the concave portion is arc-shaped. Through the above arrangement, the lead wire has a tendency to be squeezed towards the middle at the two convex portions, better eliminating the gaps between the rib, the lead wire and the groove wall of the wiring groove. At the same time, the contact sealing surface between the lead wire and the convex portion at this position is an arc surface, changing the sealing path, and better achieving the truncation of the path of the high-pressure gunpowder gas generated after the gunpowder is ignited from flushing back to the wiring groove and then spreading fire to both sides. Thus, the high-pressure gunpowder gas cannot ignite the gunpowder in the adjacent launch chamber prior to the lead wire, avoiding the phenomenon of fire spreading in the fireworks.

[0017] As another alternative, in the above-mentioned fireworks, several pressing grooves are further opened on the bottom wall of the wiring groove. Each inlet hole and each outlet hole respectively correspond to a pressing groove, and both the inlet hole and the outlet hole communicate with the bottom of the corresponding pressing groove. The rib has several pressing portions corresponding to the pressing grooves one by one, and the shape of the pressing portion is adapted to the pressing groove and is embedded in the pressing groove. Through the mutual cooperation of the pressing portion and the pressing groove, it can further prevent the high-pressure gunpowder gas generated after the gunpowder is ignited from flushing back to the inlet hole and the outlet hole of the adjacent launch chamber. Thus, the high-pressure gunpowder gas cannot ignite the gunpowder in the adjacent launch chamber prior to the lead wire, avoiding the phenomenon of fire spreading in the fireworks.

[0018] Preferably, in the above-mentioned fireworks, the cross-section of the pressing groove along the ignition direction is triangular or trapezoidal, and the cross-section of the pressing portion along the ignition direction is triangular or trapezoidal. Through the above arrangement, better pressing can be ensured.

[0019] Preferably, in the above-mentioned fireworks, the bottom plate is also provided with an embedding groove, the shape of which is consistent with the shape of the convex strip, and the embedding groove and the convex strip are respectively located on the two side surfaces of the bottom plate, and the fireworks also include a cover plate, the cover plate is provided with a convex rib matched with the embedding groove, the cover plate is abutted against the bottom plate and the convex rib extends into the embedding groove, and the bottom plate and the cover plate are fixed to the bottom of the outer tube by fasteners. A cover plate is provided on the bottom plate to ensure better strength and withstand greater recoil force. At the same time, the shape of the cover plate is consistent with that of the bottom plate, and after being damaged, the cover plate can also be used as the bottom plate for compression, which is low in cost.

[0020] Compared with the prior art, this firecracker has the following advantages:

[0021] 1. The bottom plate and the convex strips on the bottom plate are arranged so that the convex strips can press the lead wires against the bottom wall of the wiring groove, thereby eliminating the gaps between the convex strips, the lead wires and the groove wall of the wiring groove, which is equivalent to cutting off the path of the high-pressure gas of gunpowder generated after the gunpowder is ignited and then rushing back to the wiring groove and then igniting to both sides, so that the high-pressure gas of gunpowder cannot ignite the gunpowder in the adjacent firing chamber before the lead wire, avoiding the phenomenon of firework ignition, so that the gunpowder in each firing chamber is ignited and fired in sequence according to the burning order of the lead wire, and there will be no situation of multiple simultaneous firings, thereby ensuring a better firing effect and viewing experience.

[0022] 2. The outer tube and the bottom plate of the firecracker can be molded and can be recycled. It only needs to disassemble the outer tube and the bottom plate, refill the firing chamber of the outer tube with firing gunpowder and the inner tube with effect medicine, rearrange the fuse in the wiring groove, and then press the bottom plate back to tighten the fuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view of this firecracker.

[0024] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0025] Figure 3 It is a structural diagram of a firework in which the lead groove in the first embodiment is a continuous groove.

[0026] Figure 4 It is a structural diagram of a firework with a discontinuous groove as the lead groove in the first embodiment.

[0027] Figure 5 It is a structural diagram of a firework in which the lead groove in the second embodiment is a continuous groove.

[0028] Figure 6 It is a structural diagram of a firework with a discontinuous groove as the lead groove in the second embodiment.

[0029] Figure 7It is a partial sectional view of the present fireworks in the second embodiment.

[0030] Figure 8 It is a structural diagram of a fireworks with a continuous groove for the fuse groove in the third embodiment.

[0031] Figure 9 It is a structural diagram of a fireworks with an intermittent groove for the fuse groove in the third embodiment.

[0032] Figure 10 It is a structural diagram of a fireworks with a continuous groove for the fuse groove in the fourth embodiment.

[0033] Figure 11 It is an explosion diagram of the bottom plate and the pressing plate in the fifth embodiment.

[0034] In the figure, 1. outer cylinder; 1a. launching cavity; 1a1. access hole; 1a2. outlet hole; 1b. wiring groove; 1b1. protrusion; 1b2. pressing groove; 2. fuse; 3. bottom plate; 3a. rib; 3a1. recess; 3a2. pressing part; 4. cover plate; 4a. rib. Detailed implementation manners

[0035] The following are specific embodiments of the present invention and in combination with the attached drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0036] Embodiment 1

[0037] As Figure 1 and 2 shown, the present fireworks includes an inner cylinder, an outer cylinder 1 and a bottom plate 3. The outer cylinder 1 and the bottom plate 3 are formed by molding and can be recycled and reused. The outer cylinder 1 has a plurality of launching cavities 1a. One end of the launching cavity 1a is open and the other end has a bottom. The depth of the launching cavity 1a is greater than the height of the inner cylinder. An inner cylinder is respectively arranged in each launching cavity 1a. One end of the inner cylinder is open and the other end has a bottom. The inner cylinder is filled with effect gunpowder. The outer wall of the inner cylinder is clamped and positioned with the inner wall of the launching cavity 1a. A pressurizing air chamber is formed between the bottom of the inner cylinder and the bottom surface of the launching cavity 1a. A fire guiding hole is opened at the bottom of the inner cylinder, and a fuse wire is penetrated or fuse gunpowder is filled in the fire guiding hole. The pressurizing air chamber is used to fill the gunpowder for launching the inner cylinder.

[0038] The bottom of the outer cylinder 1 is also provided with a wiring groove 1b for the fuse 2 to be embedded, and an ignition groove for the fuse 2 to be embedded is also provided on the side wall of the outer cylinder 1. The ignition groove is communicated with the wiring groove 1b. An access hole 1a1 and an outlet hole 1a2 for the fuse 2 to be respectively accessed and led out are opened at the bottom of each launching cavity 1a. Along the fire guiding direction, in every two adjacent launching cavities 1a, the outlet hole 1a2 of the previous launching cavity 1a is communicated with the access hole 1a1 of the next launching cavity 1a through the wiring groove 1b. The wiring groove 1b can be arranged in a snake-shaped continuous groove structure as existing, such as Figure 3As shown, a serpentine discontinuous slot structure can also be formed by splicing multiple strip short slots, such as Figure 4 As shown. In this embodiment, the lead wire 2 is a long lead wire 2, one end of the lead wire 2 is embedded in the ignition groove and this end is the ignition end, and the ignition end of the lead wire 2 extends out of the ignition groove for ignition. The other end of the lead wire 2 is located in the wiring groove 1b, and the lead wire 2 sequentially passes through the access hole 1a1 of the launch cavity 1a and passes through the outlet hole 1a2 of the launch cavity 1a, and then passes through the access hole 1a1 of the next launch cavity 1a and passes through the outlet hole 1a2 of the launch cavity 1a, extending in sequence. As an alternative, there can also be multiple fuse wires, one end of each fuse wire passes through the outlet hole 1a2 of the previous launch cavity 1a, and the other end passes through the access hole 1a1 of the next launch cavity 1a.

[0039] Specifically, the bottom plate 3 is provided with a convex strip 3a that matches the wiring groove 1b, that is, the shape of the convex strip 3a is consistent with the shape of the wiring groove 1b. The bottom plate 3 is detachably connected to the bottom of the outer tube 1 and can cover the wiring groove 1b. The convex strip 3a is embedded in the wiring groove 1b and the outer side wall of the convex strip 3a is in contact with the inner side wall of the wiring groove 1b. The convex strip 3a can press the lead wire 2 against the bottom wall of the wiring groove 1b. The pressing surface of the convex strip 3a that is embedded in the wiring groove 1b to press the lead wire 2 is a plane, and the bottom wall of the wiring groove 1b is a plane. Figure 3 and 4 As shown. The pressing surface is pressed against the lead 2, causing the lead 2 to deform and squeeze to both sides, pressing against the two inner side walls of the wiring groove 1b. At the same time, the outer side wall of the convex strip 3a and the inner side wall of the wiring groove 1b are pressed against each other, thereby eliminating the gap between the convex strip 3a, the lead 2 and the groove wall of the wiring groove 1b, which is equivalent to cutting off the path of the gunpowder high-pressure gas generated after the gunpowder is ignited and then rushing back to the wiring groove 1b and then igniting to both sides, so that the gunpowder high-pressure gas cannot ignite the gunpowder in the adjacent firing chamber 1a before the lead 2, avoiding the phenomenon of firework ignition, so that the gunpowder in each firing chamber 1a is ignited and fired in sequence according to the burning order of the lead 2, and there will be no situation of multiple simultaneous firings, ensuring a better firing effect and viewing experience.

[0040] Embodiment 2

[0041] The structure and features of this embodiment are basically the same as those of the first embodiment, except that: Figures 5 - 7As shown, the pressing surface where the rib 3a is embedded in the wiring groove 1b to press the lead 2 is an arc surface, and the bottom wall of the wiring groove 1b is an arc surface. The shape of the bottom wall of the wiring groove 1b is adapted to the lead 2, so that after the lead 2 is pressed on the bottom wall, it can better maintain contact with the bottom wall. The shape of the pressing surface is adapted to the lead 2 to wrap the lead 2. At the same time, the outer side wall of the rib 3a is in close contact with the inner side wall of the wiring groove 1b, which can better eliminate the gaps between the rib 3a, the lead 2 and the groove wall of the wiring groove 1b. It is equivalent to cutting off the path of the high-pressure gunpowder gas generated after the gunpowder is ignited from flushing into the wiring groove 1b and then spreading fire to both sides. Thus, the high-pressure gunpowder gas cannot ignite the gunpowder in the adjacent firing chamber 1a before the lead 2, avoiding the phenomenon of fire spreading in the fireworks, enabling the gunpowder in each firing chamber 1a to be ignited and launched in sequence according to the burning order of the lead 2, and preventing the situation of multiple simultaneous launches, ensuring a good firing effect and ornamental value.

[0042] Embodiment III

[0043] The structure and features of this embodiment are basically the same as those of Embodiment I, and the differences are as follows: As Figure 8 and 9 shown, there are convex portions 1b1 protruding inward on the inner side wall of the wiring groove 1b. Along the fire-leading direction, in every two adjacent firing chambers 1a, there are such convex portions 1b1 on both inner side walls of the wiring groove 1b between the outgoing hole 1a2 of the previous firing chamber 1a and the incoming hole 1a1 of the next firing chamber 1a, and the convex portions 1b1 on both sides are symmetrically arranged. Along the fire-leading direction, the convex portion 1b1 is arc-shaped. There are recessed portions 3a1 formed by inward depression on both outer side walls of the rib 3a. The recessed portions 3a1 are arc-shaped and correspond to the convex portions 1b1 one by one, and the convex portion 1b1 can be embedded into the corresponding recessed portion 3a1. After the lead 2 is installed in the wiring groove 1b, it can be clamped along the width direction of the wiring groove 1b, so that the lead 2 has a tendency to be squeezed towards the middle at the two convex portions 1b1. Coupled with the pressing action of the rib 3a, it can better eliminate the gaps between the rib 3a, the lead 2 and the groove wall of the wiring groove 1b. At the same time, the contact sealing surface between the lead 2 and the convex portion 1b1 at this position is an arc surface, changing the sealing path, and better realizing the truncation of the path of the high-pressure gunpowder gas generated after the gunpowder is ignited from flushing into the wiring groove 1b and then spreading fire to both sides. Thus, the high-pressure gunpowder gas cannot ignite the gunpowder in the adjacent firing chamber 1a before the lead 2, avoiding the phenomenon of fire spreading in the fireworks.

[0044] Embodiment IV

[0045] The structure and features of this embodiment are basically the same as those of Embodiment I, and the differences are as follows: As Figure 10As shown in the figure, a plurality of pressing grooves 1b2 are further formed on the bottom wall of the wiring groove 1b. Each access hole 1a1 and each outlet hole 1a2 respectively correspond to a pressing groove 1b2, and the access hole 1a1 and the outlet hole 1a2 are both communicated to the bottom of the corresponding pressing groove 1b2. A plurality of pressing portions 3a2 corresponding to the pressing grooves 1b2 one by one are provided on the convex strip 3a. The shape of the pressing portion 3a2 is adapted to the pressing groove 1b2 and is embedded in the pressing groove 1b2. The cross-section of the pressing groove 1b2 along the fire-leading direction is triangular or trapezoidal. Through the mutual cooperation of the pressing portion 3a2 and the pressing groove 1b2, it can further prevent the high-pressure gunpowder gas generated after the gunpowder is ignited from flushing back to the access hole 1a1 and the outlet hole 1a2 of the adjacent launch chamber 1a, so that the high-pressure gunpowder gas cannot ignite the gunpowder in the adjacent launch chamber 1a prior to the fuse 2, avoiding the phenomenon of fireworks misfiring.

[0046] Embodiment Five

[0047] The structure and features of this embodiment are basically the same as those of Embodiment One, and the differences are as follows: As Figure 11 shown, an embedding groove is further formed on the bottom plate 3. The shape of the embedding groove is the same as that of the convex strip 3a. The embedding groove and the convex strip 3a are respectively located on the two side surfaces of the bottom plate 3. This firework further includes a cover plate 4. A convex rib 4a adapted to the embedding groove is protrudingly provided on the cover plate 4. The cover plate 4 abuts against the bottom plate 3 and the convex rib 4a extends into the embedding groove. The bottom plate 3 and the cover plate 4 are fixed to the bottom of the outer cylinder 1 through fasteners. Setting another cover plate 4 on the bottom plate 3 can ensure better strength and can withstand greater recoil force. At the same time, the convex rib 4a on the cover plate 4 has the same shape as the convex strip 3a on the bottom plate 3. After being damaged, the cover plate 4 can also be used as the bottom plate 3 for pressing, with low cost.

[0048] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0049] Although terms such as outer cylinder 1, launch chamber 1a, access hole 1a1, outlet hole 1a2, wiring groove 1b, protrusion 1b1, pressing groove 1b2, fuse 2, bottom plate 3, convex strip 3a, recessed portion 3a1, pressing portion 3a2, cover plate 4, convex rib 4a, etc. are used more frequently herein, the possibility of using other terms is not excluded. The use of these terms is only for more conveniently describing and explaining the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A fireworks, comprising an outer cylinder (1) having a plurality of launch chambers (1a), one end of the launch chamber (1a) is open, and the other end has a bottom. An access hole (1a1) and an outlet hole (1a2) through which a fuse (2) can be respectively inserted and led out are provided at the bottom of each launch chamber (1a). A wiring groove (1b) for embedding the fuse (2) is further provided at the bottom of the outer cylinder (1). Along the ignition direction, for every two adjacent launch chambers (1a), the outlet hole (1a2) of the previous launch chamber (1a) is communicated with the access hole (1a1) of the next launch chamber (1a) through the above-mentioned wiring groove (1b), characterized in that, The fireworks also include a bottom plate (3). A rib (3a) that matches the wiring groove (1b) is protrudingly provided on the bottom plate (3). The bottom plate (3) is connected to the bottom of the outer cylinder (1) and can cover the wiring groove (1b). The rib (3a) is embedded in the wiring groove (1b), and the outer side wall of the rib (3a) is in abutment with the inner side wall of the wiring groove (1b). The rib (3a) can press the lead wire (2) against the bottom wall of the wiring groove (1b). An inwardly protruding raised portion (1b1) is provided on the inner side wall of the wiring groove (1b). A recessed portion (3a1) formed by inward depression is provided on the outer side wall of the rib (3a). The recessed portions (3a1) correspond to the raised portions (1b1) one by one, and the raised portion (1b1) can be embedded in the corresponding recessed portion (3a1).

2. The fireworks according to claim 1, characterized in that, The pressing surface where the rib (3a) is embedded in the wiring groove (1b) to press the lead wire (2) is a flat surface.

3. The fireworks according to claim 1, characterized in that, The pressing surface where the rib (3a) is embedded in the wiring groove (1b) to press the lead wire (2) is an arc surface.

4. The fireworks according to claim 1 or 2 or 3, characterized in that, The bottom wall of the wiring groove (1b) is an arc surface.

5. The fireworks according to claim 1 or 2 or 3, characterized in that, Along the ignition direction, in each adjacent pair of launch chambers (1a), the inner side wall of the wiring groove (1b) between the lead-out hole (1a2) of the previous launch chamber (1a) and the lead-in hole (1a1) of the next launch chamber (1a) has the above-mentioned raised portion (1b1).

6. The fireworks according to claim 5, characterized in that, Along the ignition direction, in each adjacent pair of launch chambers (1a), the inner side walls of the wiring groove (1b) between the lead-out hole (1a2) of the previous launch chamber (1a) and the lead-in hole (1a1) of the next launch chamber (1a) have the above-mentioned raised portions (1b1), and the raised portions (1b1) on both sides are symmetrically arranged.

7. The fireworks according to claim 6, characterized in that, Along the ignition direction, the raised portion (1b1) is arc-shaped, and the recessed portion (3a1) is arc-shaped.

8. The fireworks according to claim 1 or 2 or 3, characterized in that, An embedding groove is further provided on the bottom plate (3). The shape of the embedding groove is the same as that of the rib (3a). The embedding groove and the rib (3a) are respectively located on the two side surfaces of the bottom plate (3). The fireworks also include a cover plate (4). A rib (4a) that is adapted to the embedding groove is protrudingly provided on the cover plate (4). The cover plate (4) is abutted against the bottom plate (3), and the rib (4a) extends into the embedding groove. The bottom plate (3) and the cover plate (4) are fixed to the bottom of the outer cylinder (1) by fasteners.

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