Firework and cracker agent porous array type pressing mold

Abstract

The utility model belongs to the fireworks and crackers production technical field especially, a kind of fireworks and crackers reagent porous array type pressing mould, to the friction spark and electrostatic of easy generation of existing mould when pressing, the density of propellant grain is not one caused by the uneven pressure of each die cavity, and the problem that the powder overflowed is easy to accumulate and cause safety hazard, present and propose the following scheme, including base, lower mould fixed on it and upper mould located upper, lower mould is equipped with pressure-equalizing floating female die mechanism, lower mould is also equipped with overflow powder trapping device, upper and lower mould is equipped with the anti-static guiding system including graphite copper sleeve and grounding component. In the utility model, the pressure of each die cavity is automatically balanced by the independent floating of female die unit, the density of propellant grain is ensured uniform;Powder overflow is sucked away in time by annular adsorption groove and negative pressure system, to avoid accumulation;Spark and electrostatic are eliminated by anti-static guiding system, so that the safety, consistency and cleanliness of batch pressing are improved in structure.

Description

Technical Field

[0001] This utility model relates to the field of fireworks and firecrackers production technology, and in particular to a multi-hole array pressing mold for fireworks and firecrackers agents. Background Technology

[0002] Fireworks and firecrackers are items that use pyrotechnic agents as their main energy source and produce visual effects such as light, color, sound, and fog through combustion or explosion. One of the key processes in their production is to compress the mixed loose pyrotechnic agents into powder columns or granules with a certain density, shape, and strength. Traditional production methods generally use single-hole molds. During operation, the agents are manually filled into the mold cavity, and then a punch is used to apply pressure in one or two directions. After one pressing is completed, the individual powder column is demolded and removed, and this process is repeated.

[0003] However, during the compression molding process of fireworks and firecrackers, high-speed friction between metal parts can easily generate tiny sparks. Simultaneously, the powdered powder is prone to generating and accumulating static electricity during compression, posing a significant safety hazard of ignition and explosion. Regarding compression stress, the unavoidable slight differences in the amount of powder filling each mold cavity cannot be compensated for by traditional rigid mold structures. This results in some powder columns becoming excessively dense due to over-compaction, while others become loose due to insufficient compaction, severely affecting product performance uniformity and process safety. Furthermore, at the moment the punch presses into the mold cavity, trace amounts of ultrafine powder can escape from the gaps and accumulate in the moving parts of the mold, potentially leading to accidents due to subsequent frictional heating. Therefore, we propose a multi-porous array compression mold for fireworks and firecrackers to solve these problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies, such as uneven powder density in each mold cavity during the traditional fireworks and firecrackers powder compression molding process, which affects performance, and the potential for accidents caused by the accumulation of spilled powder due to frictional heating. Therefore, this invention proposes a multi-porous array compression mold for fireworks and firecrackers powder.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A multi-hole array pressing mold for fireworks and firecrackers includes a base, a lower mold, and an upper mold. The lower mold and the upper mold are both located above the base, and the lower mold is fixedly installed on the top of the base. The upper mold is located above the lower mold and can perform vertical mold closing and opening movements relative to the lower mold.

[0007] The lower mold is provided with a pressure equalization floating die mechanism. The pressure equalization floating die mechanism includes multiple mounting through holes arrayed on the lower mold and penetrating its upper and lower end faces. Each of the multiple mounting through holes has a die unit slidably disposed in it, and each die unit is provided with a limit component. Each of the multiple die units has a forming die hole, and each of the multiple mounting through holes is provided with a disc spring.

[0008] When the lower mold is installed on the base, the top of the base blocks the lower ports of multiple mounting through holes, and the bottom and top ends of multiple disc springs abut against the top of the base and the bottom of the corresponding concave mold unit, respectively.

[0009] The lower mold is provided with a powder overflow collection device, which includes an annular adsorption groove opened at the top of each of the concave mold units and surrounding the entrance of its forming mold hole, and a negative pressure supply system for providing negative pressure to all of the annular adsorption grooves.

[0010] The bottom of the upper mold can be detachably equipped with a stamping module;

[0011] An anti-static guiding system is provided between the lower mold and the upper mold.

[0012] In one possible design, the limiting component includes two limiting sliders, which are symmetrically fixed on the outer wall of the die unit. The inner wall of the mounting through hole has two limiting grooves that match the limiting sliders, and both limiting grooves penetrate the bottom of the lower die. The two limiting sliders extend into the corresponding limiting grooves and are slidably connected to the limiting grooves.

[0013] In one possible design, the stamping die includes a mounting plate that is detachably and fixedly disposed at the bottom of the upper die, and a plurality of punches that match the die unit are fixedly disposed at the bottom of the mounting plate.

[0014] In one possible design, the antistatic guiding system includes four guide rods fixedly mounted at the bottom of the upper mold, and the top of the lower mold has guide holes that match the four guide rods. Each of the four guide holes is fitted with a graphite copper sleeve, and the guide rods slide in conjunction with the graphite copper sleeves.

[0015] In one possible design, four conductive blocks for conducting static electricity to the ground are fixedly embedded in the bottom of the lower mold, and the four conductive blocks are respectively connected to the corresponding graphite copper sleeves.

[0016] In one possible design, the negative pressure supply system includes an annular negative pressure cover fixedly sleeved on the outer wall of the lower mold, and a plurality of annular adsorption grooves are connected to the interior of the annular negative pressure cover through air guide holes. The annular negative pressure cover is connected to an external negative pressure generating device.

[0017] In one possible design, an ejection mechanism is also included to drive the demolded precipitate. The ejection mechanism includes ejector rods that are slidably disposed on the base and match multiple mounting holes. The top ends of the multiple ejector rods are slidably extended into the corresponding die unit and are fixedly provided with ejector heads. The bottom ends of the multiple ejector rods are fixedly provided with the same connecting plate.

[0018] In this application, firstly, during installation, the lower mold is fixed to the top of the base with bolts. At this time, the base seals the lower ports of all mounting through holes, so that the disc springs placed in the holes can obtain bottom support and lift the upper die unit to a uniform height to lay the foundation for uniform filling. The limiting slider on the outer wall of the die unit is inserted into the limiting groove of the mounting through hole to prevent it from rotating or falling out, but allows it to slide vertically along the groove. The bottom of the upper mold is fitted with a punch mounting plate of a specific specification with bolts, so that the array position of the punch is precisely aligned with the die unit of the lower mold. The guide rod of the upper mold is inserted into the graphite copper sleeve of the lower mold to form a guide pair and form a complete electrostatic discharge path through the grounding component of the conductive block. The annular negative pressure cover is fitted and fixed on the outside of the lower mold and is connected to the annular adsorption groove at the top of each die unit through the internal flow channel, and then connected to the external vacuum device.

[0019] During the production process, loose pyrotechnic agents are first evenly distributed on the surface of the lower mold and smoothed out, ensuring that the forming die holes of each die unit are filled with the agents. Then, the upper mold begins to descend under external force, and the guide rod slides smoothly along the graphite copper sleeve. This process is spark-free due to friction, and the generated static electricity is continuously conducted away. When the punch contacts the agents and begins to apply pressure, the overflowing trace amounts of ultrafine powder are immediately captured and sucked away by the negative pressure airflow generated by the annular adsorption tank, preventing dust accumulation. As the pressure increases, each die unit independently compresses the disc spring below based on the reaction force of the agents in its cavity, and generates a slight sinking to automatically compensate for the filling differences and balance the pressure of each hole until the punch reaches the predetermined stroke. All the pyrotechnic columns are pressed and formed synchronously. After pressing, the upper mold drives the punch to retract. Finally, the ejection mechanism is activated, and the connecting plate pushes all the ejector rods to rise synchronously. The ejector head smoothly lifts the formed pyrotechnic column from the die, completing one work cycle. The entire process achieves a continuous operation from safe pressing to clean demolding. Beneficial effects: In this utility model, the multi-hole array pressing mold for fireworks and firecrackers constitutes an adaptive pressure equalization mechanism by independently floating each concave mold unit on a disc spring. During pressing, each concave mold unit can generate a small adaptive displacement according to the actual force in the cavity, thereby automatically balancing the pressure unevenness caused by the slight difference in the amount of filling, so that the pressure borne by the agent in all mold cavities is basically the same, ensuring that the batch-pressed explosive columns have a high degree of uniformity in density and compactness.

[0020] In this utility model, a multi-hole array pressing mold for fireworks and firecrackers is constructed by setting an annular adsorption groove on the inlet end face of each concave mold unit and connecting it to a negative pressure system, thus forming a source collection device. At the moment when the punch presses the powder downwards, the ultrafine powder overflowing from the gap is immediately sucked away by the directional airflow generated by the annular groove, which effectively prevents the diffusion and accumulation of dangerous powder on the working surface and moving parts of the mold, eliminates the risk of frictional heating and pollution caused by it, and maintains a clean working environment.

[0021] In this utility model, the multi-hole array pressing mold for fireworks and firecrackers uses a graphite copper sleeve in the guide part and sets up an overall grounding circuit, which constitutes a dual protection of no sparks and static discharge. This structure avoids the generation of sparks by metal friction and continuously conducts the static electricity generated during the pressing process to the ground, eliminating the main risk of combustion and explosion caused by sparks and static discharge from the root, and significantly improving the inherent safety level of operation.

[0022] In this invention, the independent floating and adaptive fine-tuning of each die unit achieves the effect of balancing the die cavity pressure and ensuring uniform drug density; the annular negative pressure adsorption groove set at the die inlet achieves the effect of instantly removing overflow powder and avoiding dust accumulation and friction risks; and the use of spark-proof guide components and an overall grounding circuit achieves the effect of eliminating friction sparks and static electricity accumulation and improving intrinsic safety level. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural schematic diagram of a porous array-type pressing mold for fireworks and firecracker agents proposed in this utility model;

[0024] Figure 2 This is a partial cross-sectional three-dimensional structural schematic diagram of the lower mold of a multi-porous array pressing mold for fireworks and firecracker agents proposed in this utility model.

[0025] Figure 3 This is a bottom-view three-dimensional structural diagram of the mounting plate of a multi-hole array pressing mold for fireworks and firecracker agents proposed in this utility model.

[0026] Figure 4 This is a bottom-view three-dimensional structural diagram of the lower mold of a multi-porous array pressing mold for fireworks and firecracker agents proposed in this utility model.

[0027] Figure 5 This is a partial cross-sectional three-dimensional structural diagram of the concave mold unit of a multi-hole array pressing mold for fireworks and firecracker agents proposed in this utility model.

[0028] In the diagram: 1. Base; 2. Lower mold; 3. Upper mold; 4. Die unit; 401. Limiting slider; 5. Disc spring; 6. Mounting plate; 7. Punch; 8. Guide rod; 9. Graphite copper sleeve; 10. Conductive block; 11. Annular adsorption groove; 12. Annular negative pressure cover; 13. Ejector rod; 14. Ejector head; 15. Connecting plate. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] In one embodiment: Refer to Figure 1-5 A pressing mold includes a base 1, a lower mold 2 and an upper mold 3. The lower mold 2 and the upper mold 3 are both located above the base 1. The lower mold 2 is fixedly set on the top of the base 1, and the upper mold 3 is located above the lower mold 2 and can perform vertical mold closing and opening movements relative to the lower mold 2. This layout realizes the basic assembly of the mold and provides structural support for subsequent pressing operations.

[0031] Specifically, the lower mold 2 is fixed to the top of the base 1 with bolts. This fixing method ensures the stability of the lower mold 2 during operation and avoids displacement due to force, which could affect the pressing accuracy. The lower mold 2 is equipped with a pressure-equalizing floating die mechanism. This mechanism includes multiple mounting through holes arrayed on the lower mold 2, penetrating its upper and lower end faces. Die units 4 are slidably disposed within each of the mounting through holes. Each die unit 4 is equipped with a limit component and a forming die hole. Disc springs 5 ​​are installed within each of the mounting through holes. When the lower mold 2 is installed on the base 1, the top of the base 1 blocks the lower ports of the multiple mounting through holes. The bottom and top ends of the multiple disc springs 5 ​​abut against the top of the base 1 and the bottom of the corresponding die unit 4, respectively. After installation, the disc springs 5 ​​are in a pre-compressed state, which can lift the upper die units 4 to a uniform height, laying the foundation for subsequent uniform filling.

[0032] Furthermore, the limiting component includes two limiting sliders 401, which are symmetrically fixed on the outer wall of the die unit 4. Two limiting grooves matching the limiting sliders 401 are formed on the inner wall of the mounting through hole, and both limiting grooves penetrate the bottom of the lower mold 2. The two limiting sliders 401 extend into their respective limiting grooves and slide in connection with them. The cooperation between the limiting sliders 401 and the limiting grooves prevents the die unit 4 from rotating or dislodging during sliding, while maintaining its vertical sliding along the groove direction, ensuring the stable operation of the pressure-equalizing floating die mechanism. During the pressing process, each die unit 4 can independently compress the disc spring 5 below and generate a slight sinking based on the reaction force of the agent within its cavity, automatically compensating for differences in filling material and balancing the pressure in each cavity. This ensures that the agent in all cavities ultimately bears essentially the same pressure, guaranteeing a high degree of uniformity in density and compactness of the batch-pressed drug columns.

[0033] The lower mold 2 is equipped with a powder overflow collection device, which includes an annular adsorption groove 11 formed at the top of each die unit 4 and surrounding the entrance of its forming die hole, and a negative pressure supply system for providing negative pressure to all annular adsorption grooves 11. Specifically, the negative pressure supply system includes an annular negative pressure cover 12 fixedly sleeved on the outer wall of the lower mold 2. Multiple annular adsorption grooves 11 are connected to the interior of the annular negative pressure cover 12 through air guide holes. The annular negative pressure cover 12 is connected to an external negative pressure generating device. When the punch 7 contacts the agent and begins to apply pressure, the overflowing trace amounts of ultrafine powder are immediately captured and sucked away by the negative pressure airflow generated by the annular adsorption grooves 11, avoiding the diffusion and accumulation of dust on the working surface of the mold and moving parts, eliminating the risk of frictional heating and contamination, and maintaining a clean working environment.

[0034] The bottom of the upper mold 3 is detachably equipped with a stamping die assembly. Further, the stamping die assembly includes a mounting plate 6, which is detachably and fixedly mounted on the bottom of the upper mold 3. Specifically, the mounting plate 6 is fixed to the upper mold 3 by bolts. This detachable structure facilitates the replacement of mounting plates 6 with different punches 7 according to different molding requirements. Multiple punches 7 matching the die cavity 4 are fixedly mounted on the bottom of the mounting plate 6. After the mounting plate 6 is installed, the array position of the punches 7 can be precisely aligned with the die cavity 4 of the lower mold 2, ensuring that the punches 7 can accurately enter the forming die hole to press the agent during the pressing process.

[0035] An anti-static guiding system is installed between the lower mold 2 and the upper mold 3. This system includes four guide rods 8 fixedly installed at the bottom of the upper mold 3. The top of the lower mold 2 has guide holes that match the four guide rods 8, and each of the four guide holes is fitted with a graphite copper sleeve 9 with an interference fit. The guide rods 8 and the graphite copper sleeves 9 are in sliding fit. The graphite copper sleeves 9 have good self-lubricating properties, enabling the guide rods 8 to slide smoothly along the graphite copper sleeves 9 without generating sparks during the process. Furthermore, four conductive blocks 10 are fixedly embedded at the bottom of the lower mold 2 to conduct static electricity to the ground. The four conductive blocks 10 are respectively connected to the corresponding graphite copper sleeves 9, forming a complete static electricity discharge path through the conductive blocks 10. This continuously conducts away the static electricity generated during the pressing process, eliminating the main risk of combustion and explosion caused by sparks and electrostatic discharge at the source, and significantly improving the intrinsic safety level of the operation.

[0036] This application can be used in the field of fireworks and firecrackers production technology, or in other fields applicable to this application.

[0037] In another embodiment: Reference Figure 2-5 Based on Embodiment 1, an improvement is made to a multi-hole array pressing mold for fireworks and firecracker agents, which is applied in the field of fireworks and firecracker production technology. The structure of this embodiment is basically the same as the aforementioned embodiment, except that: further, the mold also includes an ejection mechanism for driving the molded explosive column to demold. The ejection mechanism includes ejector rods 13 that are slidably disposed on the base 1 and match multiple mounting holes. The top ends of the multiple ejector rods 13 respectively slide into the corresponding cavity mold unit 4 and are fixedly provided with a top head 14. The bottom ends of the multiple ejector rods 13 are fixedly provided with the same connecting plate 15. After pressing is completed, the upper mold 3 drives the punch 7 to retract, and then the ejection mechanism operates. The connecting plate 15 pushes all the ejector rods 13 to rise synchronously, and the top head 14 smoothly lifts the molded explosive column from the cavity mold, completing one work cycle.

[0038] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A porous array-type pressing mold for fireworks and firecracker agents, comprising a base (1), a lower mold (2), and an upper mold (3), characterized in that, The lower mold (2) and the upper mold (3) are both located above the base (1), and the lower mold (2) is fixedly set on the top of the base (1). The upper mold (3) is located above the lower mold (2) and can perform vertical mold closing and opening movements relative to the lower mold (2). The lower mold (2) is provided with a pressure equalization floating die mechanism. The pressure equalization floating die mechanism includes multiple mounting through holes arrayed on the lower mold (2) that penetrate its upper and lower end faces. Each of the multiple mounting through holes is slidably provided with a die unit (4), and each die unit (4) is provided with a limit component. Each of the multiple die units (4) is provided with a forming die hole, and each of the multiple mounting through holes is provided with a disc spring (5). When the lower mold (2) is installed on the base (1), the top of the base (1) blocks the lower ports of multiple mounting through holes, and the bottom and top of multiple disc springs (5) respectively abut against the top of the base (1) and the bottom of the corresponding concave mold unit (4); The lower mold (2) is provided with a powder collection device, which includes an annular adsorption groove (11) opened at the top of each of the concave mold units (4) and surrounding the entrance of its forming mold hole, and a negative pressure supply system for providing negative pressure to all the annular adsorption grooves (11). The bottom of the upper mold (3) can be detachably equipped with a stamping module; An anti-static guiding system is provided between the lower mold (2) and the upper mold (3).

2. The porous array pressing mold for fireworks and firecracker agents according to claim 1, characterized in that, The limiting component includes two limiting sliders (401). The two limiting sliders (401) are symmetrically fixed on the outer wall of the die unit (4). The inner wall of the mounting through hole has two limiting grooves that match the limiting sliders (401). Both limiting grooves penetrate the bottom of the lower mold (2). The two limiting sliders (401) extend into the corresponding limiting grooves and slide in connection with the limiting grooves.

3. The porous array pressing mold for fireworks and firecracker agents according to claim 1, characterized in that, The stamping die includes a mounting plate (6), which is detachably and fixedly disposed at the bottom of the upper die (3). A plurality of punches (7) matching the die unit (4) are fixedly disposed at the bottom of the mounting plate (6).

4. The porous array pressing mold for fireworks and firecracker agents according to claim 1, characterized in that, The antistatic guiding system includes four guide rods (8) fixedly installed at the bottom of the upper mold (3). The top of the lower mold (2) is provided with guide holes that match the four guide rods (8), and each of the four guide holes is fitted with a graphite copper sleeve (9). The guide rods (8) and the graphite copper sleeves (9) are slidably fitted together.

5. The porous array pressing mold for fireworks and firecracker agents according to claim 4, characterized in that, The bottom of the lower mold (2) is fixedly embedded with four conductive blocks (10) that conduct static electricity to the ground, and the four conductive blocks (10) are respectively connected to the corresponding graphite copper sleeves (9).

6. The porous array pressing mold for fireworks and firecracker agents according to claim 1, characterized in that, The negative pressure supply system includes an annular negative pressure cover (12) fixedly sleeved on the outer wall of the lower mold (2). Multiple annular adsorption grooves (11) are connected to the interior of the annular negative pressure cover (12) through air guide holes. The annular negative pressure cover (12) is connected to an external negative pressure generating device.

7. The porous array pressing mold for fireworks and firecracker agents according to claim 1, characterized in that, It also includes an ejection mechanism for driving the demolded molten drug column. The ejection mechanism includes ejector rods (13) that are slidably disposed on the base (1) and matched with multiple mounting holes. The top ends of the multiple ejector rods (13) are respectively slidably extended into the corresponding die unit (4) and are fixedly provided with a top head (14). The bottom ends of the multiple ejector rods (13) are fixedly provided with the same connecting plate (15).

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