A weighing and distributing device for loading a combination firework inner tube with bulk solid material

Abstract

The utility model discloses a kind of combined fireworks inner tube bulk solid material loading's weighing and distributing device, including the shell with upper and lower openings, the shell is provided with die holder, a plurality of material cavities corresponding combined fireworks inner tube are penetrated and opened with a plurality of discharge holes on the die holder, cover plate is rotatably arranged in each discharge hole, and the discharge hole is formed with the quantitative temporary storage space by cover plate closure, first drive member that can drive cover plate overturning is equipped between die holder and shell to make discharge hole open or closed, circular material guiding cylinder that can surround several discharge holes is provided on the die holder upside, circular material guiding cylinder upper end is equipped with feed inlet, and weighing module and distributing module are respectively provided on the circular material guiding cylinder. By relying on "buffer box+weighing sensor", material weight is monitored in real time, and "repeated opening and closing progressive discharging" of pneumatic pinch valve is matched, avoid the problem of traditional "one-time discharging" of material, ensure that the material amount of each batch inner tube is highly consistent.

Description

Technical Field

[0001] This utility model specifically relates to a weighing and distributing device for filling bulk solid materials into the inner tube of combined fireworks. Background Technology

[0002] In the production of combined fireworks inner tubes, the filling of bulk solid materials (such as propellants and effect charges) is a core process that determines the fireworks' ignition effect and safety. However, existing filling equipment suffers from multiple technical defects, severely restricting production efficiency, filling accuracy, and product consistency. Specific problems include: Traditional filling equipment lacks a dedicated weighing module, relying heavily on manual estimation or simple volumetric metering (such as fixed scoops), making it impossible to accurately control the total weight of a single filling. While some equipment is equipped with weighing functions, it uses a "one-time feeding and weighing" mode. Bulk materials (especially powders) are prone to "rushing" (large quantities being fed in a short time) due to differences in flowability, resulting in weighing errors of ±5% or more, failing to meet the stringent requirements for material consistency in fireworks inner tubes. Existing equipment lacks a targeted material distribution structure, causing materials to concentrate in the center or localized areas after entering the guiding area, leading to significant differences in material quantity at different feeding holes on the mold base (some holes lack material, while others overflow). 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 weighing and distributing device for filling bulk solid materials into the inner tube of combined fireworks. A weighing and distributing device for filling bulk solid materials into the inner tube of a combined fireworks device includes a shell with openings at the top and bottom. A mold base is disposed within the shell. Several discharge holes are perforated on the mold base corresponding to multiple material cavities of the combined fireworks inner tube. A cover plate is rotatably disposed within each discharge hole, closing it to create a fixed amount of temporary storage space. A first driving component is provided between the mold base and the shell, capable of driving the cover plate to rotate, thereby opening or closing the discharge holes. A circular guide cylinder is disposed on the upper side of the mold base, capable of enclosing the discharge holes. An inlet is provided at the upper end of the circular guide cylinder. A distributing module and a weighing module are respectively disposed on the circular guide cylinder. The weighing module includes a buffer box and a support frame with upper and lower openings, and a weighing sensor disposed between the buffer box and the support frame. The support frame is disposed on a circular guide cylinder. The lower opening of the buffer box is aligned and connected to the feed port. A discharge plate and a second driving component are respectively disposed on the buffer box. The discharge plate is rotatably disposed at the lower end of the buffer box and can close or open its lower inner opening. The second driving component is connected to the discharge plate and can drive the discharge plate to open and close relative to the buffer box. The material distribution module includes a motor disposed on a circular guide cylinder and a connecting shaft disposed on the motor drive shaft. The connecting shaft is rotatably disposed inside the circular guide cylinder through a bearing and is coaxial with the circular guide cylinder. One end of the connecting shaft is provided with a connecting strip arranged radially with the circular guide cylinder. The connecting strip is provided with bristles that can abut against the mold base.

[0004] In one embodiment, the first driving component includes a plurality of rotating shafts and transmission blocks respectively disposed at one end of the rotating shafts, and a first cylinder disposed on the housing. The plurality of rotating shafts pass through a plurality of material discharge holes located on the same axis, and the rotating shafts are rotatably disposed on the mold base by bearings. Cover plates located on the same axis are respectively fixedly connected to the rotating shafts. One side of the transmission block has a protrusion, the center of which is eccentrically disposed relative to the center of the rotating shaft. The drive shaft of the first cylinder is provided with a connecting seat, and one side of the connecting seat has a horizontally recessed drive groove, and the protrusion is movably disposed in the drive groove.

[0005] In one embodiment, the protrusion is circular in shape and is rotatably connected to the transmission block.

[0006] In one embodiment, the second driving component includes a second cylinder, a first hinge block, and a second hinge block. The first hinge block is hinged to one side of the buffer box, the second cylinder is disposed on the first hinge block, and the second hinge block is disposed on the drive shaft of the second cylinder and hinged to the unloading plate.

[0007] In one embodiment, a material bin is further provided above the buffer bin, the lower end of the material bin is provided with a feeding pipe that can communicate with its inner cavity, and the feeding pipe is provided with a switch valve.

[0008] In one embodiment, the switching valve is a pneumatic pinch valve.

[0009] 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.

[0010] In one embodiment, the upper side of the mold base has a circular groove, the circular guide cylinder has a cavity with openings at the top and bottom, the lower end of the circular guide cylinder can be inserted into the circular groove, the upper end of the circular guide cylinder is provided with a flange, a baffle is detachably connected to the flange, and the feed port is formed on the baffle.

[0011] In one embodiment, a plurality of guide shafts are spaced apart on the circular guide cylinder, and the guide shafts are movably connected to the housing via bearings, so that the circular guide cylinder can move up and down relative to the housing.

[0012] In one embodiment, a fixed housing is connected between the upper ends of a plurality of guide shafts, the fixed housing having a sealed mounting cavity, and the motor being disposed within the mounting cavity.

[0013] In summary, the advantages of this utility model over the prior art are: This invention utilizes a "buffer box + weighing sensor" to monitor material weight in real time. Combined with the "repeated opening and closing for gradual feeding" of a pneumatic clamp valve, it avoids the material overflow problem of traditional "one-time feeding." The weighing error is reduced from over ±5% to within ±1%, ensuring a highly consistent material quantity in each batch of inner cylinders and completely resolving uneven combustion effects and the risk of cylinder explosion. Simultaneously, precise weighing reduces manual material replenishment / reduction, increasing raw material utilization to over 98% and reducing material waste by 10%-15% annually. Furthermore, the material distribution module uses a combination of "motor + coaxial connecting shaft + radial connecting strip + brush bristles". The motor drives the brush bristles to make a circular motion around the central axis of the guide cylinder, covering the entire material guiding area. This pushes the concentrated material evenly above each discharge hole, reducing the material quantity deviation in the inner cylinder cavity from 10%-15% to within ±2%, and increasing the product qualification rate to over 98%. Furthermore, the shell and the mold base are detachably connected. When changing specifications, only the mold base with different feeding holes or circular grooves of different depths needs to be replaced, without replacing the shell, thus reducing the cost of mold components. At the same time, the mold base is quickly positioned through slots and support flanges, and is 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.

[0014] 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. The powder quantity requirements of different inner cylinders can be met without additional mold changes. 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 powder from scattering, but also achieves universal compatibility between the guide structure and multi-specification mold bases. Attached Figure Description

[0015] Figure 1 This is one of the perspective views of a weighing and distributing device for filling bulk solid materials into the inner tube of a combined firework according to one embodiment of the present invention; Figure 2 This is a partial exploded view of a weighing and distributing device for filling bulk solid materials 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 weighing and distributing device for filling bulk solid materials into the inner tube of a combined firework according to one embodiment of the present invention. Figure 4 This is one of the partial exploded views of a weighing and distributing device for filling bulk solid materials into the inner tube of a combined firework according to one embodiment of the present invention; Figure 5 This is a second perspective view of a weighing and distributing device for filling bulk solid materials into the inner tube of a combined firework according to one embodiment of the present invention. Figure 6 This is the third perspective view of a weighing and distributing device for filling bulk solid materials into the inner tube of a combined firework according to one embodiment of the present invention; Figure 7 This is a second partial exploded view of a weighing and distributing device for filling bulk solid materials into the inner tube of a combined fireworks device according to one embodiment of this utility model. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figures 1 to 7The present invention preferably provides a weighing and distributing device for filling bulk solid materials into the inner tube of a combined firework, comprising a shell 1 with upper and lower openings, a mold base 2 disposed inside the shell 1, and a plurality of discharge holes 3 through which the mold base 2 corresponds to multiple material cavities of the combined firework inner tube. A cover plate 4 is rotatably disposed in each discharge hole 3, and the cover plate 4 closes to form a fixed amount of temporary storage space within the discharge hole 3. A first driving member 5 is provided between the mold base 2 and the shell 1, capable of driving the cover plate 4 to rotate, thereby opening or closing the discharge hole 3. A circular guide cylinder 22 is disposed on the upper side of the mold base 2, capable of enclosing the plurality of discharge holes 3. The upper end of the circular guide cylinder 22 is provided with a feed inlet 71. A distributing module and a weighing module are respectively disposed on the circular guide cylinder 22. The weighing module includes a buffer box 72 with upper and lower openings and a support frame 73, and a distributing module and a weighing module disposed on the buffer box 72 and the support frame 73. Weighing sensors 74 are located between support frames 73. The support frames 73 are mounted on a circular guide cylinder 22. The lower opening of the buffer box 72 is aligned and connected to the feed inlet 71. A discharge plate 75 and a second driving component 76 are respectively mounted on the buffer box 72. The discharge plate 75 is rotatably mounted on the lower end of the buffer box 72 and can close or open its lower opening. The second driving component 76 is connected to the discharge plate 75 and can drive the discharge plate 75 to open and close relative to the buffer box 72. The material distribution module includes a motor 96 mounted on the circular guide cylinder 22 and a connecting shaft 95 mounted on the drive shaft of the motor 96. The connecting shaft 95 is rotatably mounted inside the circular guide cylinder 22 through bearings and is coaxial with the circular guide cylinder 22. One end of the connecting shaft 95 is provided with a connecting strip 94 arranged radially with the circular guide cylinder 22. The connecting strip 94 is provided with bristles 93 that can abut against the mold base 2.

[0017] Specifically, the support frame is fixed on the circular guide cylinder to provide stable support for the weighing module; the buffer box is suspended on the support frame by a weighing sensor, which can detect the weight of the material in the buffer box in real time.

[0018] Bulk solid materials are first injected into the buffer box through an external conveying structure (such as a hopper), and the weighing sensor simultaneously feeds back the weight data to the control system; when the weight of the material reaches the preset "total weight of a single filling", the external conveying structure stops feeding material, and the quantitative weighing is completed.

[0019] The second drive component is activated, which drives the unloading plate to rotate relative to the buffer box. The unloading plate flips from the "closed buffer box lower opening" state to the "open state". The quantitative material in the buffer box falls precisely into the feed port of the circular guide cylinder connected below through the lower opening, completing the unloading of the quantitative material.

[0020] After unloading is completed, the second drive component drives the unloading plate to reverse and reset, resealing the lower opening of the buffer box in preparation for the next weighing.

[0021] The motor is fixed on the circular guide cylinder, and its drive shaft is coaxially connected to the connecting shaft. The connecting shaft is rotatably mounted inside the circular guide cylinder through bearings and is coaxial with the circular guide cylinder to ensure that the connecting shaft does not deviate when rotating.

[0022] After the motor starts, the drive shaft drives the connecting shaft to rotate synchronously; the connecting strip at one end of the connecting shaft is arranged in the same radial direction as the circular guide cylinder (that is, the connecting strip extends along the radius of the guide cylinder). Therefore, when the connecting shaft rotates, the connecting strip will make a circular motion around the central axis of the guide cylinder, covering the upper surface of the mold base inside the entire guide cylinder.

[0023] The bristles on the connecting strip abut against the surface of the mold base. As the connecting strip moves in a circular motion, the bristles "sweep and distribute" the material in the guide tube: the material concentrated in the center or part of the guide tube is evenly pushed to the top of each discharge hole on the mold base, ensuring that the temporary storage space of each discharge hole can cover a sufficient amount of material.

[0024] After the material is dispensed, a fixed amount of material is covered above each feeding hole on the mold base; at this time, the cover plate is in the "closed feeding hole" state, and an independent temporary storage space is formed inside the feeding hole, where the material is temporarily stored above the cover plate.

[0025] The first drive component is activated, which drives all the cover plates in the discharge holes to rotate synchronously: the cover plates rotate from the "closed state" to the direction away from the inner wall of the discharge hole, opening the "discharge channel" of the discharge hole.

[0026] The measured amount of material above each feeding hole falls vertically down the feeding hole and precisely falls into the corresponding aligned material cavity of the combined fireworks cylinder below, completing a single "quantitative-uniform-precise" filling.

[0027] After filling is complete, the first drive component drives the cover plate to reverse and reset, resealing the discharge hole to prevent leakage of residual material and preparing for the next filling cycle.

[0028] 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.

[0029] 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; all cover plates on the coaxial line are fixedly connected to the same rotating shaft, that is, one rotating shaft can synchronously 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Specifically, a first cylinder 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 protrusion → transmission block rotates → rotating shaft and cover plate move".

[0034] 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, the 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.

[0035] 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.

[0036] 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.

[0037] The first cylinder, as the power source, can achieve automated and precise speed control through pneumatic control, thereby adjusting the flipping angle and opening and closing time of the cover plate to meet the needs of different powder filling amounts, reduce manual operation, and improve production efficiency.

[0038] Furthermore, the protrusion 53 is circular in shape and is rotatably connected to the transmission block 52.

[0039] Specifically, the transmission block of the drive component has an annular protrusion on one side. This protrusion is not fixed to the transmission block, but is rotatably connected to the transmission block. 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.

[0040] Furthermore, the second driving component 76 includes a second cylinder 77, a first hinge block 78 and a second hinge block 79. The first hinge block 78 is hinged to one side of the buffer box 72, the second cylinder 77 is disposed on the first hinge block 78, and the second hinge block 79 is disposed on the drive shaft of the second cylinder 77 and hinged to the unloading plate 75.

[0041] Specifically, after the buffer tank completes quantitative weighing, the second cylinder is activated, and the cylinder drive shaft extends outward. The drive shaft applies a pulling force (or pushing force, depending on the installation direction) to the unloading plate through the second hinge block. Since the unloading plate is rotatably connected to the lower end of the buffer tank, the pulling force causes the unloading plate to "flip downward" around the rotation point, gradually opening the lower opening of the buffer tank. At this time, the quantitative material in the buffer tank falls into the feed inlet of the circular guide cylinder along the opening, completing the unloading. After unloading, the second cylinder drive shaft retracts, and the second hinge block pulls the unloading plate in the opposite direction, causing the unloading plate to "flip upward" around the rotation point until it completely fits the edge of the lower opening of the buffer tank, resealing the inner cavity. At the same time, the first hinge block can rotate slightly with the cylinder movement to avoid jamming between the drive shaft and the unloading plate due to angular misalignment, ensuring smooth opening and closing and tight sealing of the unloading plate.

[0042] By repeatedly extending and retracting the second cylinder, the unloading plate is repeatedly opened and closed, causing it to vibrate. This effectively prevents material from remaining on the unloading plate and affecting subsequent weighing and unloading.

[0043] Furthermore, it also includes a material bin 80 located directly above the buffer bin 72. The lower end of the material bin 80 is provided with a feeding pipe 81 that can communicate with its inner cavity. The feeding pipe 81 is provided with a switching valve 82. The switching valve 82 is a pneumatic clamp valve.

[0044] Specifically, the material bin is fixed directly above the buffer bin and is pre-stored with a sufficient amount of bulk solid material. In the initial state, the pneumatic clamp valve on the feed pipe is in the "closed" state. The clamp valve blocks the material passage between the material bin and the buffer bin by squeezing the wall of the feed pipe, preventing the material from flowing out by gravity.

[0045] When the weighing sensor detects that the weight of the material in the buffer bin is lower than the "start feeding threshold" (i.e., material needs to be added for the next weighing), the control system sends a signal to the pneumatic clamp valve, and the clamp valve "opens" - stopping the squeezing of the feeding pipe, allowing the feeding pipe to be unobstructed, and the material in the bin falls naturally into the buffer bin below along the feeding pipe.

[0046] As materials continuously enter the buffer bin, the weighing sensor provides real-time weight data. When the weight reaches the preset "total weight for a single filling", the control system immediately controls the pneumatic clamp valve to "close", re-squeezing the feed pipe to block the material, completing one automated feeding cycle and ensuring that the weight of the material in the buffer bin accurately meets the standard.

[0047] Initially, the clamp valve is completely closed, the buffer tank is empty, and the load cell reports a weight of "zero". After the control system is started, it first controls the pinch valve to open and close to a small degree (the opening degree is only 30%-50% of the maximum opening degree, and the opening and closing time is 0.5-1 second. The specific parameters can be adjusted according to the material flowability). At this time, the bulk material in the hopper falls into the buffer box along the feed pipe at a "small amount and slow" speed.

[0048] After the first opening and closing, the clamp valve immediately closes, the weighing sensor synchronously collects the current weight of the buffer box, and transmits the data to the control system.

[0049] The control system compares the current weight with the preset "total weight for a single filling" and calculates the weight deviation: if the deviation is large (e.g., the current weight is less than 50% of the target weight), the clamp valve is kept at a small opening for a second filling, and then closed again and weighed; if the deviation is small (e.g., the current weight reaches 80%-90% of the target weight), the clamp valve opening is reduced (e.g., reduced to 10%-20% of the maximum opening) and the opening and closing time is shortened (e.g., 0.2-0.3 seconds) for a third micro-fill to avoid overfilling; if the deviation is very small (e.g., the current weight is only ±5g away from the target weight), the clamp valve is controlled to perform a final precise filling using "inching opening and closing" (opening ≤10%, time ≤0.1 seconds).

[0050] When the weight fed back by the weighing sensor reaches the preset value (error ≤ ±1g, can be set as needed), the control system immediately sends a signal, the clamp valve is completely closed and locked, all feeding actions are stopped, and the progressive weighing is completed.

[0051] 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.

[0052] Specifically, a slot communicating with the inner cavity is provided on one side of the shell, and the supporting flanges on both sides of the slot form a horizontal supporting surface; the shape of the mold base is adapted to the slot, and it can be inserted into the shell along the slot, and the lower surface of the mold base can fit against the supporting flange; the mold base and the shell are further secured by a bag buckle. The bag buckle is a relatively mature existing technology, and its structural principle will not be described in detail here. A matching mold base is selected according to the number and aperture specifications of the material cavities in the inner tube of the combined fireworks to be filled. The mold base is fixed to the lower opening of the shell through a detachable connection, ensuring that each feeding 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. 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.

[0053] 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.

[0054] 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.

[0055] Furthermore, the mold base 2 has a circular groove 21 recessed on its upper side, the circular guide cylinder 22 has a cavity with openings at the top and bottom, the lower end of the circular guide cylinder 22 can be inserted into the circular groove 21, the upper end of the circular guide cylinder 22 is provided with a flange 83, a baffle 84 is detachably connected to the flange 83, and the feed port 71 is formed on the baffle 84.

[0056] 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".

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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 to the inner wall of the guide cylinder and the edge of the groove.

[0062] Since different sizes of mold bases may have different thicknesses, the vertical 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 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.

[0063] Furthermore, a fixed housing 99 is connected between the upper ends of several guide shafts 98, and the fixed housing 99 has a sealed mounting cavity 97 inside, and the motor 96 is disposed in the mounting cavity 97.

[0064] Specifically, the upper end of the guide shaft is connected to the fixed housing, providing stable support for the fixed housing and related components. The sealed mounting cavity inside the fixed housing isolates the motor from the external environment, preventing powder from entering the motor and causing wear or short circuits, thus ensuring long-term stable operation of the motor. The connecting shaft is rotatably mounted on the fixed housing via bearings, ensuring both flexible rotation of the connecting shaft and further enhancing the sealing of the mounting cavity through bearing seals.

[0065] 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 weighing and distributing device for filling bulk solid materials into the inner tube of a combined fireworks display, comprising a shell (1) with openings at the top and bottom, characterized in that: The housing (1) is provided with a mold base (2). The mold base (2) has several material discharge holes (3) that are opened through the multiple material cavities corresponding to the inner tube of the combined fireworks. A cover plate (4) is rotatably installed in each material discharge hole (3). The cover plate (4) is closed to form a certain amount of temporary storage space in the material discharge hole (3). A first driving member (5) is provided between the mold base (2) and the housing (1) to drive the cover plate (4) to flip so that the material discharge hole (3) is opened or closed. (2) A circular guide cylinder (22) is provided on the upper side, which can enclose a plurality of feeding holes (3). The upper end of the circular guide cylinder (22) is provided with a feed inlet (71). A material distribution module and a weighing module are respectively provided on the circular guide cylinder (22). The weighing module includes a buffer box (72) with upper and lower openings and a support frame (73), and a weighing sensor (74) is provided between the buffer box (72) and the support frame (73). The support frame (73) is provided on the circular guide cylinder. On the material cylinder (22), the lower opening of the buffer box (72) is aligned and connected with the feed inlet (71). A discharge plate (75) and a second driving component (76) are respectively provided on the buffer box (72). The discharge plate (75) is rotatably disposed at the lower end of the buffer box (72) and can close or open its lower inner opening. The second driving component (76) is connected to the discharge plate (75) and can drive the discharge plate (75) to open and close relative to the buffer box (72); a material distribution module, which includes... The motor (96) is mounted on the circular guide cylinder (22), and the connecting shaft (95) is mounted on the drive shaft of the motor (96). The connecting shaft (95) is rotatably mounted inside the circular guide cylinder (22) via a bearing and is coaxial with the circular guide cylinder (22). One end of the connecting shaft (95) is provided with a connecting strip (94) arranged radially with the circular guide cylinder (22). The connecting strip (94) is provided with bristles (93) that can abut against the mold base (2).

2. The weighing and distributing device for filling bulk solid materials into the inner tube of a combined fireworks container according to claim 1, characterized in that: The first driving component (5) includes several rotating shafts (51) and transmission blocks (52) respectively disposed at one end of the rotating shafts (51), and a first cylinder (54) disposed on the housing (1). 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) through 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. The center of the protrusion (53) is eccentrically disposed relative to the center of the rotating shaft (51). The drive shaft of the first cylinder (54) is provided with a connecting seat (55). The connecting seat (55) has a horizontal drive groove (56) recessed on one side. The protrusion (53) is movably disposed in the drive groove (56).

3. The weighing and distributing device for filling bulk solid materials into the inner tube of a combined fireworks container according to claim 2, characterized in that: The protrusion (53) is round in shape and is rotatably connected to the transmission block (52).

4. The weighing and distributing device for filling bulk solid materials into the inner tube of a combined fireworks container according to claim 1, characterized in that: The second driving component (76) includes a second cylinder (77), a first hinge block (78) and a second hinge block (79). The first hinge block (78) is hinged to one side of the buffer box (72). The second cylinder (77) is disposed on the first hinge block (78). The second hinge block (79) is disposed on the drive shaft of the second cylinder (77) and is hinged to the unloading plate (75).

5. The weighing and distributing device for filling bulk solid materials into the inner tube of a combined fireworks container according to claim 1, characterized in that: It also includes a material box (80) located directly above the buffer box (72), the lower end of which is provided with a feeding pipe (81) that can communicate with its inner cavity, and the feeding pipe (81) is provided with a switch valve (82).

6. The weighing and distributing device for filling bulk solid materials into the inner tube of a combined fireworks container according to claim 5, characterized in that: The switching valve (82) is a pneumatic pinch valve.

7. The weighing and distributing device for filling bulk solid materials into the inner tube of a combined fireworks container according to 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).

8. The weighing and distributing device for filling bulk solid materials into the inner tube of a combined fireworks container according to claim 1, characterized in that: The mold base (2) has a circular groove (21) recessed on the upper side. The circular guide cylinder (22) has a cavity with openings at the top and bottom. The lower end of the circular guide cylinder (22) can be inserted into the circular groove (21). The upper end of the circular guide cylinder (22) is provided with a flange (83). A baffle (84) is detachably connected to the flange (83). The feed port (71) is formed on the baffle (84).

9. A weighing and distributing device for filling bulk solid materials into the inner tube of a combined fireworks container according to claim 1, characterized in that: The circular 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 circular guide cylinder (22) can move up and down relative to the housing (1).

10. A weighing and distributing device for filling bulk solid materials into the inner tube of a combined fireworks container according to claim 9, characterized in that: A fixed housing (99) is connected between the upper ends of several guide shafts (98), and the fixed housing (99) has a sealed mounting cavity (97) inside, and the motor (96) is disposed in the mounting cavity (97).

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