A replaceable mold structure for filling powder into the inner tube of combined fireworks

Abstract

This utility model discloses a replaceable mold structure for filling powder into the inner tube of combined fireworks. It includes a shell with upper and lower openings. A mold base is detachably connected to the lower opening of the shell. The mold base has several discharge holes corresponding to multiple material cavities of the combined fireworks inner tube. A cover plate is rotatably installed in each discharge hole, creating a fixed temporary storage space within the discharge hole. The mold base is equipped with a driving component that can rotate the cover plate to open or close the discharge hole. Because the shell and mold base are detachably connected, only the mold base with different discharge holes or circular grooves of different depths needs to be replaced when changing specifications, eliminating the need to replace the shell, thus reducing mold component costs. Simultaneously, the mold base is quickly positioned via slots and supporting flanges, and secured with bag buckles, shortening mold change time compared to traditional molds and allowing for rapid response to different fireworks inner tube production needs.

Description

Technical Field

[0001] This utility model specifically relates to a replaceable mold structure for filling powder into the inner tube of combined fireworks. Background Technology

[0002] In the powder filling process of combined fireworks inner tubes, specialized molds are the core equipment. However, existing molds have multiple defects, severely restricting production flexibility, cost control, and filling quality. Specific problems are as follows: The shell and mold base of existing molds are mostly fixedly connected. If different specifications of fireworks (such as the number of inner tubes, hole diameter, and filling volume) need to be produced, the entire mold must be replaced. This not only leads to high procurement costs for mold parts but also requires frequent machine shutdowns for disassembly and reassembly, significantly reducing the continuous operation efficiency of the production line. Furthermore, existing feeding structures are mostly manual or simple mechanically controlled, making it impossible to simultaneously "open / close" multiple feeding holes, which easily leads to material leakage and uneven filling, affecting the fireworks display effect. Utility Model Content

[0003] The present invention aims to at least partially solve one of the problems existing in the existing related technologies. To this end, the present invention proposes a replaceable mold structure for filling powder into the inner tube of combined fireworks. A replaceable mold structure for filling powder into the inner tube of a combined firework includes a shell with upper and lower openings. A mold base is detachably connected to the lower opening of the shell. The mold base has several discharge holes that are opened through multiple material cavities corresponding to the inner tube of the combined firework. A cover plate is rotatably installed in each discharge hole. The cover plate is closed to form a certain amount of temporary storage space inside the discharge hole. The mold base is provided with a driving component that can drive the cover plate to flip so that the discharge hole is opened or closed.

[0004] In one embodiment, the housing has a slot communicating with its inner cavity on one side, and support flanges are respectively provided on the inner walls of the two sides of the housing in the slot. The mold base is inserted into the slot and presses against the support flanges. The mold base and the housing are connected by a bag buckle.

[0005] In one embodiment, the driving component includes a plurality of rotating shafts and transmission blocks respectively disposed at one end of the rotating shafts. The plurality of rotating shafts pass through a plurality of feeding holes located on a coaxial line, and the rotating shafts are rotatably disposed on the mold base by bearings. Cover plates located on the coaxial line are respectively fixedly connected to the rotating shafts. One side of the transmission block has a protrusion, and the center of the protrusion is eccentrically disposed relative to the center of the rotating shaft.

[0006] In one embodiment, the driving component further includes a first cylinder disposed on the housing, the driving shaft of the first cylinder being provided with a connecting seat, the connecting seat having a horizontally recessed driving groove on one side, and the protrusion being movably disposed within the driving groove.

[0007] In one embodiment, the protrusion is circular in shape and is rotatably connected to the transmission block.

[0008] In one embodiment, the upper side of the mold base has a circular groove, and the housing is provided with a guide cylinder that can cooperate with the circular groove. The guide cylinder has a material cavity with openings at the top and bottom, and several discharge holes are located within the area of ​​the material cavity.

[0009] In one embodiment, the guide cylinder is provided with a plurality of guide shafts at intervals, and the guide shafts are movably connected to the housing through bearings so that the guide cylinder can move up and down relative to the housing.

[0010] In summary, the advantages of this utility model over the prior art are: This utility model features a detachable connection between the housing and the mold base. When changing specifications, only the mold base with different feeding holes or circular grooves of different depths needs to be replaced, without replacing the housing, thus reducing the cost of mold components. At the same time, the mold base can be quickly positioned through slots and support flanges, and can be fixed with bag buckles, shortening the mold change time compared to traditional molds, and can quickly respond to different fireworks inner tube production needs. Furthermore, the driving component drives the connecting seat through the first cylinder, and in conjunction with the protrusion of the transmission block and the driving groove, it synchronously drives multiple rotating shafts to rotate, realizing the "synchronous opening / closing" of all feeding holes; and the cooperation between the guide cylinder and the groove can perform secondary positioning of the mold base, combined with the fixing effect of the bag buckle, to ensure the filling accuracy.

[0011] Furthermore, the depth of the circular groove can be preset or adjusted. By changing the groove depth, the capacity of each feeding hole and cover plate combination can be directly changed, thereby controlling the amount of material fed at one time. By changing the mold, the powder quantity requirements of different inner cylinders can be met. At the same time, the guide cylinder can move up and down and can adaptively adjust the descent stroke according to the groove depth to ensure a tight fit with the groove, which not only prevents the powder from scattering, but also achieves universal compatibility between the guide structure and multi-specification mold bases. Attached Figure Description

[0012] Figure 1 An exploded view of a replaceable mold structure for filling powder into the inner tube of a combined firework, according to one embodiment of the present invention. Figure 2 This is a perspective view of a replaceable mold structure for filling powder into the inner tube of a combined firework, according to one embodiment of the present invention. Figure 3 This is a cross-sectional view of a replaceable mold structure for filling powder into the inner tube of a combined firework in one embodiment of the present invention. Figure 4 This is a partial exploded view of a replaceable mold structure for filling powder into the inner tube of a combined firework, according to one embodiment of the present invention. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figures 1 to 4 The present invention preferably provides a replaceable mold structure for filling powder into the inner tube of a combined firework, including a shell 1 with upper and lower openings. A mold base 2 is detachably connected to the lower opening of the shell 1. The mold base 2 has several discharge holes 3 through which multiple material cavities of the inner tube of the combined firework are opened. A cover plate 4 is rotatably provided in each discharge hole 3. The cover plate 4 is closed to form a certain amount of temporary storage space in the discharge hole 3. The mold base 2 is provided with a driving member 5 that can drive the cover plate 4 to flip so that the discharge hole 3 is opened or closed.

[0014] Specifically, based on the number and aperture specifications of the material cavities in the inner tube of the combined fireworks to be filled, a matching mold base is selected (the number and position of the discharge holes on the mold base correspond one-to-one with the material cavities in the inner tube). The mold base is fixed to the lower opening of the shell through a detachable connection method (such as plug-in, snap-fit, etc.), ensuring that each discharge hole on the mold base is precisely aligned with the material cavity of the inner tube to be filled below, laying the foundation for the subsequent directional falling of powder. Before adding powder into the shell, the drive component first causes the cover plates in all discharge holes to simultaneously flip to the "closed state," that is, the cover plates are attached to the inner wall of the discharge hole, blocking the upper and lower channels of the discharge hole.

[0015] At this point, each feeding hole and its corresponding cover plate work together to form the capacity of a single material chamber in the inner tube of the firework. Powder is injected into the upper opening of the shell with upper and lower openings. The powder will be temporarily stored between several feeding holes and their corresponding cover plates to prevent premature leakage of the powder.

[0016] When the amount of powder temporarily stored in the shell meets the requirements for a single filling, the drive component is activated. Through mechanical transmission, the drive component drives the cover plate in each discharge hole to simultaneously rotate to the "open state," causing the cover plate to detach from the inner wall of the discharge hole and opening the powder falling channel. The temporarily stored powder will fall vertically along each discharge hole, precisely landing in the aligned inner cylinder cavity below, completing a single powder filling.

[0017] After the powder is filled, the drive component drives the cover plate to flip in the opposite direction again, returning it to the "closed state" to prevent the leakage of any remaining powder inside the shell. If it is necessary to switch to producing inner tubes of different specifications of combined fireworks, simply disconnect the detachable connection between the shell and the mold base, remove the current mold base, replace it with a mold base that matches the material cavity of the new specification inner tube, and repeat the above steps to achieve specification switching without replacing the entire shell.

[0018] Furthermore, the driving component 5 includes a plurality of rotating shafts 51 and transmission blocks 52 respectively disposed at one end of the rotating shafts 51. The plurality of rotating shafts 51 pass through a plurality of feeding holes 3 located on the same axis, and the rotating shafts 51 are rotatably disposed on the mold base 2 by bearings. The cover plates 4 located on the same axis are fixedly connected to the rotating shafts 51. One side of the transmission block 52 has a protrusion 53, and the center of the protrusion 53 is eccentrically disposed relative to the center of the rotating shaft 51.

[0019] Specifically, several rotating shafts correspond to several material feeding holes coaxially distributed on the mold base, and the rotating shafts are rotatably mounted on the mold base via bearings (to ensure smooth rotation and reduce friction); all cover plates on the same axis are fixedly connected to the same rotating shaft, meaning that one rotating shaft can simultaneously drive multiple cover plates on its axis to move. At the same time, a transmission block is fixed to one end of each rotating shaft, and a protrusion is provided on one side of the transmission block, which serves as a force receiving point to receive external driving force.

[0020] When an external driving force is applied to the protrusion of the transmission block, the transmission block will rotate around the axis of the shaft and synchronously drive the shaft to rotate within the bearing. Since the cover plate is fixedly connected to the shaft, the rotation of the shaft will directly drive the cover plate to flip synchronously. When the cover plate flips away from the inner wall of the discharge hole, the discharge hole opens, allowing the powder to pass through. When the cover plate flips and fits close to the inner wall of the discharge hole, the discharge hole closes, blocking the powder from falling.

[0021] Because the feed holes on the coaxial axis share a single rotating shaft, the eccentrically positioned protrusion can more efficiently convert external driving force into rotational torque, ensuring a more sensitive and stable response of the rotating shaft and cover plates. The movement of a single transmission block can synchronously drive all cover plates on the same axis to rotate, ensuring that the "open / close" actions of the feed holes in the same group are completely consistent, avoiding uneven powder filling caused by the delay in the movement of a single cover plate, and improving the stability and accuracy of feed control.

[0022] Furthermore, the driving component 5 also includes a first cylinder 54 disposed on the housing 1. The driving shaft of the first cylinder 54 is provided with a connecting seat 55. A horizontal driving groove 56 is recessed on one side of the connecting seat 55, and the protrusion 53 is movably disposed in the driving groove 56.

[0023] Specifically, a first cylinder (fixed to the housing) is added to the drive component, and its drive shaft is connected to the connecting seat. One side of the connecting seat is recessed to form a drive groove. The protrusion of the transmission block is movably embedded in the drive groove, forming a complete power chain of "cylinder outputs power → connecting seat transmits power → drive groove drives the protrusion → transmission block rotates → rotating shaft and cover plate move".

[0024] When the discharge hole needs to be opened, the drive shaft of the first cylinder extends, pushing the connecting seat to move in a straight line; the drive groove of the connecting seat moves synchronously, and generates a thrust on the protrusion embedded therein through the groove wall. Since the protrusion is fixedly or rotatably connected to the transmission block, this thrust drives the transmission block to rotate around the axis of rotation, thereby driving the rotation shaft and the cover plate to rotate synchronously, so that the discharge hole is opened.

[0025] When it is necessary to close the discharge hole, the drive shaft of the first cylinder retracts, pulling the connecting seat to move in the opposite direction in a straight line. The drive groove generates a pulling force on the protrusion through the groove wall, driving the transmission block and the rotating shaft to rotate in the opposite direction. The cover plate then resets and closes the discharge hole.

[0026] Since the protrusions of all transmission blocks are movably set in the drive groove of the same connecting seat, the single action of the first cylinder can drive all protrusions and transmission blocks to move synchronously through the connecting seat, ensuring that the flipping action of all rotating shafts and cover plates is completely synchronized, avoiding inconsistent opening and closing of the discharge hole due to power delay of a single component, and further improving the uniformity and accuracy of powder filling.

[0027] The first cylinder, as the power source, can achieve automated and precise speed control of its movements through pneumatic control (such as controlling the speed and stroke of the drive shaft's extension / retraction), thereby adjusting the flipping angle and opening / closing time of the cover plate to meet the needs of different powder filling amounts, reduce manual operation, and improve production efficiency.

[0028] Furthermore, the protrusion 53 is circular in shape and is rotatably connected to the transmission block 52.

[0029] Specifically, the drive component has an annular protrusion on one side of the transmission block. This protrusion is not fixed to the transmission block, but is rotatably connected to the transmission block (that is, it can rotate relative to the transmission block around its own axis). When the first cylinder drives the connecting seat to move linearly, the drive groove of the connecting seat generates a pushing or pulling force on the annular protrusion. Because the protrusion is annular and can rotate relative to the transmission block, during the force application process, the protrusion rotates synchronously around its own axis as the drive groove moves, converting the linear motion of the connecting seat into a rotational driving force on the transmission block. At this point, the friction between the protrusion and the drive groove changes from sliding friction to rolling friction, reducing resistance in power transmission. The rotating connection design of the annular protrusion reduces jamming and wear during transmission, ensuring smoother and more stable rotation of the transmission block and shaft, ultimately resulting in more precise flipping angles of the cover plate and more synchronized opening and closing of the feed holes in the same group.

[0030] Furthermore, one side of the housing 1 has a slot 11 that communicates with its inner cavity. The slot 11 has supporting flanges 12 on both sides of the inner wall of the housing 1. The mold base 2 is inserted into the slot 11 and presses against the supporting flanges 12. The mold base 2 and the housing 1 are connected by a bag buckle 13.

[0031] Specifically, one side of the housing has a slot communicating with the inner cavity, and the supporting flanges on both sides of the slot's inner wall form a horizontal supporting surface; the shape of the mold base is adapted to the slot, allowing it to be inserted into the housing along the slot, and the lower surface of the mold base can fit against the supporting flanges; the mold base and the housing are further secured by a bag hook and loop fastener. Bag hook and loop fasteners are a relatively mature existing technology, and their structural principles will not be described in detail here.

[0032] When installing the mold base, push the mold base horizontally into the slot of the housing until it is fully inserted into the slot. At this time, the lower surface of the mold base will naturally press against the support flanges on both sides of the slot. The support flanges provide vertical support for the mold base, ensuring that the height position of the mold base on the housing is accurately fixed, while limiting the vertical sway of the mold base, so that the material discharge hole on the mold base is accurately aligned with the housing and the material cavity of the inner cylinder below.

[0033] After positioning is complete, fasten the latch between the mold base and the housing. The locking structure of the latch generates a clamping force along the slot direction, firmly fixing the mold base in the slot and preventing horizontal displacement of the mold base due to vibration or powder impact during powder filling, thus ensuring the relative position stability of the mold base and the housing.

[0034] When it is necessary to change to a different size mold base, simply unfasten the bag's buckle, pull out the old mold base along the slot in the opposite direction, and then push the new mold base into the slot and fasten the buckle. The entire process does not require disassembling bolts or other complex parts. Relying on the guiding role of the slot and the positioning role of the supporting flange, the new mold base can be quickly and accurately installed, greatly improving the efficiency of mold changing.

[0035] Furthermore, the upper side of the mold base 2 has a circular groove 21 recessed therein, and the housing 1 is provided with a guide cylinder 22 that can cooperate with the circular groove 21. The guide cylinder 22 has a material cavity with openings at the top and bottom, and a number of discharge holes 3 are located within the area of ​​the material cavity.

[0036] Specifically, a circular groove is formed by the inward indentation on the upper side of the mold base, and the guide cylinder inside the shell is adapted to the shape of the circular groove. The guide cylinder is a hollow structure with openings at the top and bottom, and its coverage area can completely include all the discharge holes on the mold base, forming a powder channel of "guide cylinder enclosed area → circular groove → discharge hole".

[0037] Furthermore, the depth of the circular groove can be preset or adjusted. By changing the groove depth, the capacity of each feeding hole combined with the cover plate can be directly changed, thereby controlling the amount of material fed at one time. By changing the mold, the powder quantity requirements of different inner cylinders can be met. When powder is injected into the housing, the guide cylinder forms a circumferential obstruction, confining the powder within a circular area inside the guide cylinder and preventing it from scattering outside the circular groove on the mold base. Simultaneously, the inner wall of the guide cylinder guides the powder to flow naturally downwards, causing it to concentrate and fall into the circular groove of the mold base. This ensures that the powder accurately covers the upper ends of all discharge holes, laying the foundation for subsequent uniform material feeding.

[0038] The circular groove works in conjunction with the guide cylinder to form a relatively enclosed temporary storage space for the powder. The guide cylinder surrounds the powder from above, while the circular groove supports it from below, together confining the powder within a specific area. This design effectively prevents the powder from scattering due to shell movement or airflow before filling, reducing material waste and preventing scattered powder from contaminating the equipment or affecting the normal operation of other components.

[0039] Since all the discharge holes are located within the material cavity of the guide cylinder, the powder concentrated in the circular grooves can cover the temporary storage cavity formed by each discharge hole and its corresponding cover plate. When the discharge hole is opened, the powder can fall directly from the temporary storage space into the discharge hole without the need for additional powder position adjustment, ensuring sufficient and uniform powder supply to each discharge hole and further improving the consistency of powder filling in the inner cylinder.

[0040] Furthermore, the guide cylinder 22 is provided with a plurality of guide shafts 98 at intervals, and the guide shafts 98 are movably connected to the housing 1 through bearings so that the guide cylinder 22 can move up and down relative to the housing 1.

[0041] Specifically, when it is necessary to fill powder, the guide cylinder can move downwards until its lower edge is embedded in the circular groove of the mold base, forming a closed guiding and temporary storage space with the groove, ensuring that the powder is concentrated and does not scatter; When filling is complete or the mold base needs to be replaced, the guide cylinder can move upward, detach from the circular groove, and be raised to a certain height to avoid interference with the mold base. This facilitates the pulling and replacement of the mold base and reduces the adhesion of powder between the inner wall of the guide cylinder and the edge of the groove (because detachment reduces residue).

[0042] Since different sizes of mold bases may have different thicknesses (or different depths of circular grooves), the up-and-down movement of the guide cylinder can flexibly adjust the distance between its lower edge and the upper surface of the mold base. This ensures that after any size mold base is installed, the guide cylinder can accurately embed itself into the groove by moving downwards, forming an effective seal and avoiding the guide gap problem caused by the thickness difference of the mold base.

[0043] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A replaceable mold structure for filling powder into the inner tube of combined fireworks, comprising a shell (1) with upper and lower openings, characterized in that: The lower opening of the shell (1) is detachably connected to a mold base (2). The mold base (2) has several material holes (3) that are opened through the multiple material cavities of the combined fireworks inner tube. A cover plate (4) is rotatably installed in each material hole (3). The cover plate (4) is closed to form a certain amount of temporary storage space in the material hole (3). The mold base (2) is provided with a driving component (5) that can drive the cover plate (4) to flip so that the material hole (3) is opened or closed.

2. The replaceable mold structure for filling powder into the inner tube of a combined firework as described in claim 1, characterized in that: The housing (1) has a slot (11) on one side that communicates with its inner cavity. The slot (11) has support flanges (12) on both sides of the inner wall of the housing (1). The mold base (2) is inserted into the slot (11) and presses against the support flanges (12). The mold base (2) and the housing (1) are connected by a bag buckle (13).

3. The replaceable mold structure for filling powder into the inner tube of combined fireworks according to claim 1, characterized in that: The driving component (5) includes several rotating shafts (51) and transmission blocks (52) respectively disposed at one end of the rotating shafts (51). The several rotating shafts (51) pass through several feeding holes (3) located on the same axis, and the rotating shafts (51) are rotatably disposed on the mold base (2) by bearings. The cover plates (4) located on the same axis are fixedly connected to the rotating shafts (51). The transmission block (52) has a protrusion (53) on one side, and the center of the protrusion (53) is eccentrically disposed relative to the center of the rotating shaft (51).

4. A replaceable mould structure for filling of powder in a combination firework inner tube according to claim 3, characterized in that: The drive component (5) further includes a first cylinder (54) disposed on the housing (1). The drive shaft of the first cylinder (54) is provided with a connecting seat (55). A horizontal drive groove (56) is recessed on one side of the connecting seat (55). The protrusion (53) is movably disposed in the drive groove (56).

5. A replaceable mould structure for filling of powder in a combination firework inner tube according to claim 3, characterized in that: The protrusion (53) is round in shape and is rotatably connected to the transmission block (52).

6. A replaceable mould structure for filling of powder in a combination firework inner tube according to claim 1, characterized in that: The mold base (2) has a circular groove (21) recessed on the upper side. The housing (1) is provided with a guide cylinder (22) that can cooperate with the circular groove (21). The guide cylinder (22) has a material cavity with openings at the top and bottom, and several discharge holes (3) are located within the area of ​​the material cavity.

7. A replaceable mould structure for filling of powder in a combination fireworks inner tube according to claim 6, characterized in that: The guide cylinder (22) is provided with several guide shafts (98) spaced apart. The guide shafts (98) are movably connected to the housing (1) through bearings so that the guide cylinder (22) can move up and down relative to the housing (1).

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