Composite forming equipment for binary cavity particle-adding filter stick

Abstract

The invention discloses composite forming equipment for a filter stick with particles added into a cavity, and belongs to the technical field of cigarette making equipment, the composite forming equipment comprises a filter stick composite unit, a cavity particle adding unit and a filter stick forming unit which are designed in a modularized rapid splicing mode, and rapid switching between a binary composite filter stick and a particle adding type filter stick can be achieved; the cavity particle adding unit integrates feeding, screening, quantifying, excess material recycling and supporting and adjusting assemblies, precise screening, quantitative feeding and excess material recycling of particles are achieved through cooperative linkage of a control system and other units, and the cavity particle adding unit is compatible with various functional particles such as activated carbon and perfume. The equipment is high in automation degree, high in particle adding precision and high in material utilization rate, the requirements of harm reduction, aroma enhancement and differentiation of cigarettes can be met, and the flexibility and the production efficiency of a production line are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of tobacco manufacturing equipment technology, specifically to a cavity-added granular filter rod composite molding equipment, which is particularly suitable for composite filter rod production scenarios that require the precise addition of functional particles (such as activated carbon, fragrance particles, tea particles, etc.) between filter rod segments to achieve the requirements of "harm reduction, aroma enhancement, and differentiation". It can flexibly adapt to the switching production of binary composite filter rods and cavity-added granular composite filter rods. Background Technology

[0002] With the tobacco industry's pursuit of healthier and more personalized cigarette products, "harm reduction, aroma enhancement, and differentiation" have become the core directions for filter rod research and development. The market demand for composite filter rods with high resistance, low tar, and rich aroma continues to grow, which not only drives innovation in filter rod materials but also places higher demands on the functionality, flexibility, and precision of filter rod production equipment.

[0003] In existing technologies, traditional filter rod composite molding equipment is mainly used to splice and composite filter rods of various materials, but it cannot accurately add functional particles into the cavities between filter rod segments; some equipment with particle addition functions have the following drawbacks: The integrated structural design is incompatible with existing binary filter rod composite molding equipment, resulting in high equipment modification costs, poor production line flexibility, and difficulty in quickly switching between ordinary composite filter rods and particle-added composite filter rods. The lack of an effective screening and dust recovery mechanism during the particle addition process leads to insufficient particle purity, serious dust pollution in the production environment, and affects the quality stability of filter rod products. The low particle metering accuracy makes it impossible to dynamically adjust the filling amount according to the filter rod delivery speed and cavity length, resulting in inconsistent particle filling amounts in different filter rod sections, which affects the smoking experience. Incomplete recovery of residual material after granulation leads to material waste, and residual granules can easily cause cross-contamination, affecting the quality of subsequent products. The lack of coordination between units, the reliance on manual intervention for adjustments, low level of automation, and limited production efficiency all contribute to the problem.

[0004] To address the aforementioned technical issues, this invention proposes a modular, automated, and high-precision cavity-adding particle filter rod composite molding equipment. By adding an independent cavity-adding particle unit and adopting a rapid assembly design and collaborative control system, it achieves low-cost upgrades and efficient, flexible production of existing equipment. Summary of the Invention

[0005] The purpose of this invention is to provide a cavity-added granular filter rod composite molding equipment, which aims to achieve rapid switching between binary composite filter rods and cavity-added granular composite filter rods without significant modifications to existing equipment, thus reducing production line upgrade costs; improve the accuracy and stability of granule addition, ensuring consistent granule filling in the cavity of each filter rod to meet product quality requirements; integrate granule screening, dust recovery, and residual material recovery functions to improve granule purity and reduce material waste and environmental dust pollution; and achieve fully automated and coordinated processes for feeding, screening, quantification, addition, and recovery, reducing manual intervention and improving production efficiency and equipment operational stability.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: To achieve the above objectives, the technical solution adopted by the present invention is as follows: a cavity-adding particle filter rod composite molding device, comprising a filter rod composite unit, a cavity-adding particle unit and a filter rod molding unit, wherein each unit adopts a modular design and can be quickly assembled and disassembled.

[0007] Filter rod composite unit: used to cut filter rods of various materials into filter rod segments of specified lengths, arrange them in sequence and feed them to the forming smoke gun, providing a basic filter rod structure for granule addition and subsequent rolling; Cavity particle addition unit: Located between the filter rod composite unit and the filter rod forming unit, it is used to accurately add granular materials to the cavity between the filter rod sections after screening and quantitative measurement, while recovering residual materials and dust. Filter rod forming unit: used to roll, shape and cut composite filter rods with added particles, and finally obtain cavity-added particle composite filter rods that meet the specifications; The filter rod composite unit and the filter rod forming unit are electrically interconnected using a bridge-type electrical control connection device. The left side of the filter rod composite unit frame, the right side of the filter rod forming unit frame, and both ends of the cavity particle addition unit all adopt a quick splicing and positioning structure, which can realize the quick switching between binary composite filter rod equipment and binary cavity particle addition composite filter rod forming equipment.

[0008] The cavity particle addition unit is the core unit of this invention, integrating functions such as feeding, screening, quantification, addition, recovery, support adjustment, and control. Specifically, it includes: The feeding assembly uses a stainless steel sealed container to store granular materials. The sealed design prevents the granules from getting damp or contaminated and supports the storage and switching of various functional granules. The lower end of the sealed container is equipped with a conveying pipe that connects to the granule screening assembly and is equipped with a feeding valve. The feeding valve is electrically connected to the control system and can be automatically opened and closed through the control system signal to accurately control the feeding rhythm of the granule screening assembly.

[0009] The particle screening assembly consists of a material cylinder, a particle screening device, a material distributor, a discharge valve, a dust removal valve, a feeding and unloading valve, a rotary valve, and a dust recovery device. The feed cylinder is equipped with a feeding valve, a dust removal valve, and a feeding and unloading valve, all of which are electrically connected to the control system. Through the coordinated opening and closing of the valves, the orderly conveying of particulate materials from the feeding component to the particulate screening device is realized. The particle screening device is equipped with a rotary valve. After the rotary valve is opened, the particle screening device starts to operate. The particle material enters the filter screen for preliminary filtration to remove large-sized impurities. Then the distributor performs secondary screening of the particles to ensure that the particle size is uniform. At the same time, the dust recovery device adsorbs the dust generated during the screening process through negative pressure to avoid environmental pollution and particle waste. The feeding valve is electrically connected to the control system and automatically opens and closes according to a preset program, transporting the screened qualified particles through pipelines to the quantitative addition component.

[0010] Quantitative addition component: Located downstream of the particle screening component, it mainly consists of a quantitative disc and an addition hopper; The metering disc is a rotary volumetric metering device with several U-shaped grooves of equal volume on its outer circumference. After the granular material enters the U-shaped groove, it rotates with the metering disc to a set angle and is released into the lower addition hopper under the action of gravity. The addition hopper is set on the annular belt and has a funnel-shaped structure to ensure that the particulate material falls smoothly into the cavity between the filter rod sections without any residue. The rotation speed and start / stop status of the metering disc are adjusted in real time by the control system based on the filter rod conveying speed and cavity length, with an adjustment accuracy of ±0.01g / segment, ensuring that the particle filling amount in each cavity is consistent.

[0011] Waste material recovery assembly: The left waste material recovery device and the right waste material recovery device are symmetrically arranged on both sides of the feeding hopper to form a suction-type recovery channel; The right residual material recovery device is fixed to the drive plate of the quantitative addition component, and the fan-shaped suction port is approximately in contact with the outer wall of the addition hopper; the left residual material recovery device is installed on the support adjustment component and can be raised and lowered synchronously with the adjustment mechanism to always maintain the optimal relative position between the suction port and the addition hopper. The left and right residual material recovery devices are connected to the same negative pressure source through independent pipelines. The negative pressure value can be adjusted from -0.03 to -0.08 MPa. The residual material that does not fall into the cavity enters the sealed recovery tank after being adsorbed by negative pressure. The recycling rate can reach more than 99%, avoiding cross-contamination and material waste.

[0012] Support and adjustment component: Located between the filter rod composite unit and the filter rod forming unit, the particle screening component, the quantitative addition component and the residual material recovery component are all integrated on this component; The support adjustment component uses a cylinder and slide rail assembly. The cylinder stroke adjustment range is ~mm. The vertical position of the quantitative addition component is adjusted in real time through the control system to ensure that the drop point of the granular material and the filter rod on the forming smoke gun are always at the optimal distance allowed by the process (0.5~2mm), avoiding granule spillage or filling position deviation.

[0013] Control system: The core control module for adding particle units to the cavity, with a built-in PLC controller, communicates with the control systems of the filter rod composite unit and filter rod forming unit via EtherCAT bus, with a communication delay of ≤10ms; The control system collects the running speed signal of the main motor of the filter rod forming unit in real time. After processing by the PLC, it adjusts the running speed and precise start and stop of the quantitative addition component to achieve synchronous linkage between particle addition and filter rod conveying. Equipped with a high-level sensor, a low-level sensor, and a residual material sensor, the high-level sensor is installed above the particle screening device, the low-level sensor is placed below the distributor, and the residual material sensor is located inside the sealed barrel. It monitors the material level at each position in real time, with a detection accuracy of ±1mm. The control system automatically adjusts the start and stop of the feeding component, the working frequency of the particle screening component, and the start and stop of the residual material recovery component based on the feedback signals from the sensors, so as to realize the coordinated linkage of the entire process of feeding, screening, quantification, and recovery.

[0014] The auxiliary components of the filter rod forming unit include a structural refrigeration unit, which provides condensate water to the smoke gun components of the filter rod forming unit. The condensate water temperature is controlled within the range of 5 to 15°C to ensure the shaping effect of the filter rod after rolling and to prevent the filter rod from deforming. Adhesive supply system: The adhesive is evenly applied to the center and edges of the forming paper. The amount of adhesive applied can be adjusted from 0.05 to 0.15 g / m, so as to realize the synchronous winding and forming of the filter rod and the forming paper, effectively preventing the filter rod from bursting during the forming process.

[0015] The beneficial effects of this invention are: 1. Modular design with strong flexibility and adaptability: The filter rod composite unit, cavity particle addition unit, and filter rod forming unit adopt a quick splicing and positioning design, which can realize the rapid switching between binary composite filter rods and cavity particle addition composite filter rods without modifying the existing equipment structure. The switching time is ≤30 minutes, which significantly improves the utilization rate of the production line. The cavity particle addition unit adopts an independent control system and quick-connect interface, which is convenient for disassembly, maintenance and upgrading.

[0016] 2. Full-process automation and high coordination: The three major units are connected and linked through the EtherCAT bus. The control system (26) adjusts the operating parameters of each component in real time according to the filter rod conveying speed, material level status, etc., to realize closed-loop control of feeding, screening, quantitative, adding and recycling. Manual intervention only requires periodic replenishment and equipment inspection. The production efficiency is increased by more than 30%, and the product qualification rate can reach more than 99.5%.

[0017] 3. Precise particle addition and stable product quality: The quantitative disc adopts an equal volume U-shaped groove design, combined with PLC real-time speed control, and the particle filling error is ≤±0.01g / segment; the support adjustment component dynamically adjusts the addition position to ensure that the particles fall accurately into the cavity; the particle screening component has a secondary screening and dust recovery function to improve particle purity and avoid impurities from affecting the filter rod's filtration performance and smoking experience.

[0018] 4. High material utilization rate and good environmental protection: The waste material recovery component has a suction design, and the waste material recovery rate is ≥99%, which greatly reduces material waste; the dust recovery device effectively adsorbs dust in the screening process, and the dust concentration in the workshop is ≤0.5mg / m³, which meets environmental protection standards and improves the production environment.

[0019] 5. Multifunctional and highly compatible: It uses a stainless steel sealed container to store granules, supporting the switching of various functional granules such as activated carbon, spice granules, and tea granules. There is no need to replace the core components. Only the control system parameters need to be adjusted to adapt to the physical properties of different granules, meeting the diversified R&D needs of "harm reduction, aroma enhancement, and differentiation". Attached Figure Description

[0020] Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is a schematic diagram of the rear view structure of the present invention; Figure 3 A three-dimensional structural diagram of adding particle units to a cavity; Figure 4 A three-dimensional structural diagram of adding particle units to a cavity; Figure 5 Particle feeding and unloading control process for adding particles to the cavity Figure 1 ; Figure 6 Particle feeding and unloading control process for adding particles to the cavity Figure 2 .

[0021] Reference numerals are provided in the attached figures; where 1 is a filter rod composite unit; 2 is a cavity particle adding unit; 21 is a feeding assembly; 211 is a sealed barrel; 22 is a particle screening assembly; 221 is a feeding valve; 222 is a material cylinder; 223 is a dust removal valve; 224 is a feeding and unloading valve; 225 is a particle screening device; 226 is a rotary valve; 227 is a material distributor; 228 is a dust recovery device; 229 is a discharge valve; 23 is a support adjustment assembly; 24 is a quantitative adding assembly; 241 is a quantitative pan; 242 is an adding hopper; 25 is a residual material recovery assembly; 251 is a left residual material recovery device; 252 is a right residual material recovery device; 26 is a control system; 261 is a high-level sensor; 262 is a low-level sensor; 3 is a filter rod forming unit; 31 is a refrigeration unit; 32 is a glue supply system; and 33 is a smoke gun component. Detailed Implementation

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0023] Example 1: like Figure 1-5 As shown, this embodiment provides a cavity-adding particle filter rod composite molding device, including a filter rod composite unit 1, a cavity-adding particle unit 2, and a filter rod molding unit 3; The filter rod composite unit 1, the cavity particle adding unit 2, and the filter rod forming unit 3 are arranged in sequence and mechanically connected through the quick splicing positioning structure at both ends of the frame, with a connection error of ≤0.2mm. The filter rod composite unit 1 and the filter rod forming unit 3 are electrically interconnected by a bridge-type electrical control connection device, and the cavity particle adding unit 2 is connected to the overall control system through a quick-connect interface.

[0024] The stainless steel sealed barrel 211 of the feeding assembly 21 is fixed above the equipment frame. The conveying pipe is connected to the material cylinder 222 of the particle screening assembly 22, and the feeding valve 221 is installed. The particle screening device 225, the distributor 227, and the dust recovery device 228 are sequentially integrated below the material cylinder 222 to ensure that the particle conveying channel is unobstructed. The quantitative addition assembly 24 is installed on the slide rail of the support adjustment assembly 23, and the addition hopper 242 is aligned with the filter rod conveying path of the formed smoke gun. The left residual material recovery device 251 and the right residual material recovery device 252 are symmetrically installed on both sides of the addition hopper 242. The distance between the suction port and the addition hopper 242 is adjusted to 0.3-0.5mm, and the negative pressure source is connected to the sealed recovery barrel.

[0025] For the debugging of the control system: install the high level sensor 261, low level sensor 262, and residual material sensor in the designated positions and connect them to the PLC controller of the control system 26; establish the communication connection between the control system 26 and the control systems of filter rod composite unit 1 and filter rod forming unit 3 through the EtherCAT bus, and calibrate the signal acquisition accuracy; preset process parameters such as filter rod length, cavity length, particle filling amount, and metering disc rotation speed.

[0026] The workflow is divided into: 1. Preparation of filter rod composite After the filter rod composite unit 1 is started, two different types of filter rods, such as cellulose acetate filter rods and paper filter rods, are fed into the slitting system and cut into filter rod segments of specified lengths. Then, they are fed into the suction belt for composite by the conveying system, and arranged by the transfer plate to eliminate gaps. The filter rod segments fall sequentially into the forming paper belt below, which is driven by the cloth belt to move in a circular motion. The conveying speed of the cloth belt is synchronized with the speed of the main motor of the filter rod forming unit 3.

[0027] 2. Granular Addition (1) Feeding: Granular material such as activated carbon granules in sealed barrel 211 is detected by residual material sensor. When the material level is lower than the set threshold, the control system 26 sends a signal, the feeding valve 221 and the feeding and unloading valve 224 are opened, the rotary valve 226 and the dust removal valve 223 are closed, and the granules enter the material cylinder 222 through the conveying pipe. When the high material level sensor 261 detects that the material level in the material cylinder 222 has reached the set value, the feeding valve 221 and the feeding and unloading valve 224 are closed, the rotary valve 226 and the dust removal valve 223 are opened, the dust recovery device 228 is started, and the dust in the material cylinder 222 is adsorbed.

[0028] (2) Screening: After the rotary valve 226 is opened, the particle screening device 225 is started. The particle material enters the filter screen to filter out large-sized impurities, and then falls into the distributor 227 for secondary screening to ensure that the particle size is uniform. The dust generated during screening is adsorbed and recovered by the dust recovery device 228. The recovered dust can be centrally disposed of after treatment to avoid pollution.

[0029] (3) Quantitative: After screening, qualified particles enter the quantitative addition component 241 of the quantitative addition component 24 through the feeding valve 229. The quantitative addition component 241 rotates at a preset speed under the drive component. The U-shaped groove is filled with quantitative particles. When it rotates to the angle corresponding to the addition hopper 242, the particles are released into the addition hopper 242.

[0030] (4) Adding and recycling of residual material: Adding hopper 242 accurately feeds the granular material into the cavity between two adjacent filter rod sections in the forming paper tape; at the same time, the residual material recycling component 25 is activated, and the left residual material recycling device 251 and the right residual material recycling device 252 adsorb the residual material that has not fallen into the cavity through negative pressure. The residual material enters the sealed recycling tank through the pipeline. The recycled granular material can be reused after screening.

[0031] 3. Filter rod forming The paper path system of filter rod forming unit 3 transports the forming paper along a fixed line to the forming gun. Before the forming paper enters the gun, the glue supply system 32 applies glue evenly to the center and edges of the forming paper, with the glue application amount set to 0.1g / m. The forming paper carrying filter rod segments and particles enters the forming gun and is wound into shape under the action of the belt drive assembly. The refrigeration unit 31 provides condensate to ensure the filter rod is shaped. The continuous composite filter rod strip after being wound into shape is cut into composite filter rod segments of specified length by the slitting unit, completing the production.

[0032] 4. Collaborative and coordinated control The control system 26 collects the running speed signal of the main motor of the filter rod forming unit 3 in real time. When the speed of the main motor is adjusted, the PLC controller synchronously calculates and adjusts the rotation speed of the quantitative disk 241 to ensure that the particle filling amount matches the filter rod conveying speed. When the low material level sensor 262 detects that the material level below the feeder 227 is insufficient, the control system 26 adjusts the feeding rhythm in time to avoid interruption of particle addition.

[0033] 5. Mode switching: When it is necessary to switch to producing binary composite filter rods, the operation steps are as follows: The control system 26 for adding particles to the cavity 2 is shut down, and the electrical connection of the quick-connect interface is disconnected. The cylinder supporting the adjustment component 23 lifts the metering component 24, the residual material recovery component 25, etc., and separates them from the filter rod conveying path of the forming smoke gun. Loosen the mechanical splicing structure between filter rod composite unit 1, cavity particle addition unit 2, and filter rod forming unit 3, and move cavity particle addition unit 2 to the designated area. The filter rod composite unit 1 and the filter rod forming unit 3 are directly connected through a quick splicing and positioning structure, and the bridge-type electrical control device is reconnected. Adjusting the process parameters and starting the equipment will produce binary composite filter rods, with the switching process taking ≤30 minutes.

[0034] 6. Parameter optimization: Based on different particle characteristics and product requirements, the following parameters can be adjusted through the control system 26 to optimize production results: Particle filling amount: can be precisely adjusted by adjusting the volume or rotation speed of the U-shaped groove of the metering disc 241; Add positional accuracy: Adjust the vertical position of the metering component 24 by using the cylinder supporting the adjustment component 23 to ensure minimal deviation in the particle landing point; Residual material recycling efficiency: By adjusting the negative pressure value of the negative pressure source, the recycling needs of particles with different specific gravities can be adapted to ensure a high residual material recycling rate; Dust recovery effect: Adjust the opening time of dust removal valve 223 and the negative pressure intensity of dust recovery device 228 according to the content of particulate dust to ensure that the workshop production environment meets the standards.

[0035] For equipment maintenance, it is necessary to regularly check the sealing performance of components such as the sealed barrel 211, conveying pipe, and material cylinder 222 to prevent particles from getting damp or leaking; clean the filter screen and distributor 227 of the particle screening device 225 weekly to prevent impurities from accumulating and affecting the screening effect; check the wear of the U-shaped groove of the quantitative disc 241 monthly, and replace it in time if deformation or wear occurs to ensure quantitative accuracy; regularly calibrate the high-level sensor 261, low-level sensor 262, and residual material sensor to ensure accurate signal detection; the residual material in the recycling bin should be screened and reused regularly to avoid material waste; the filter element of the dust recovery device 228 should be replaced regularly to ensure dust removal effect.

[0036] Example 2 The technical solution of the present invention is not limited to the specific embodiments described above, and can be adjusted according to actual needs: Particle types: Can be replaced with different functional particles such as spice particles, tea particles, molecular sieve particles, etc., only the sieve aperture and quantitative parameters need to be adjusted; Filter rod material: It can be adapted to the composite of two or more different filter rod materials. The cutting and conveying system of filter rod composite unit 1 can adjust the parameters according to the characteristics of the filter rod material. Equipment scale: Multiple sets of cavity particle adding units 2 can be designed to work in parallel according to production capacity requirements, or the volume of the sealed barrel 211 and the recycling barrel can be expanded to improve continuous production capacity.

[0037] In summary, this invention, through modular design, fully automated control, and high-precision particle addition technology, solves the problems of insufficient functionality, poor flexibility, and low particle addition accuracy of existing filter rod forming equipment. It enables rapid switching between binary composite filter rods and cavity-added particle composite filter rods, improving production efficiency and product quality, and has broad application prospects.

[0038] Working principle of a binary cavity particle filter rod composite molding device: The composite filter rod unit 1 cuts and conveys filter rods of different materials from the two feeding units separately, and then enters the suction system for composite conveying to the three-plate transfer for gap elimination and arrangement.

[0039] The cavity adding particle unit 2 filters the granules through the screening component 22 and then feeds them into the quantitative adding component for precise quantitative feeding. The granules are then fed into the filterless section of the forming paper wrapped with a cloth belt on the forming cigarette gun through the adding hopper 242.

[0040] The paper path system of filter rod forming unit 3 transports the forming paper along the process route to the front end of the forming smoke gun. The glue supply system applies the center line glue to the forming paper, which then enters the forming smoke gun. Under the action of the belt drive assembly, the forming paper is driven downward.

[0041] After the two types of filter rods and granular materials are arranged in an orderly manner on the forming paper, they are driven into the cigarette gun by the belt drive assembly to form the required circumferential filter rod strips. After cooling and shaping, they are cut into binary cavity composite filter rod segments of specified lengths.

[0042] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A cavity-added granular filter rod composite molding device, characterized in that, It includes a filter rod composite unit (1), a cavity particle addition unit (2), and a filter rod forming unit (3). The filter rod composite unit (1) is used to cut and arrange filter rods of different materials in sequence and then convey them to the forming smoke gun; The cavity particle adding unit (2) is used to precisely add particulate material to the cavity position between each filter rod segment; The filter rod forming unit (3) is used to roll and form the composite filter rod with added particles to complete the preparation of the cavity-added particle composite filter rod. The filter rod composite unit (1) and the filter rod forming unit (3) are electrically interconnected through a bridge-type electrical control connection device. The left side of the filter rod composite unit (1) frame, the right side of the filter rod forming unit (3) frame, and both ends of the cavity particle adding unit (2) are quickly spliced ​​and positioned to realize the rapid splicing and switching between the binary composite filter rod equipment and the binary cavity particle adding composite filter rod forming equipment.

2. The cavity-adding granular filter rod composite molding equipment according to claim 1, characterized in that, The cavity particle adding unit (2) includes a feeding component (21). The feeding component (21) stores the particle material through a sealed barrel (211). The lower end of the sealed barrel (211) is provided with a conveying pipe, which is connected to the particle screening component (22) and equipped with a feeding valve (221). The feeding valve (221) is electrically connected to the control system (26). After the control system (26) sends a signal, the feeding valve (221) automatically opens and closes to realize the feeding or stopping of the particle screening component (22).

3. The cavity-adding granular filter rod composite molding equipment according to claim 2, characterized in that, The particle screening assembly (22) consists of a material cylinder (222), a particle screening device (225), a material distributor (227), and a discharge valve (229); the feeding valve (221), dust removal valve (223), and feeding / discharging valve (224) are sequentially arranged on the material cylinder (222) and electrically connected to the control system (26), and can automatically open and close according to the control signal issued by the control system (26) to transport the particle material from the feeding assembly (21) to the particle screening assembly (22); the particle screening device (225) is equipped with There is a rotary valve (226). When the rotary valve (226) is opened, the particle screening device (225) operates, and the particle material enters the filter screen for filtration. At the same time, the feeder (227) further screens the particle material, and the dust recovery device (228) adsorbs and recovers the dust generated during the screening process. The feed valve (229) is electrically connected to the control system (26). The control system (26) controls the feed valve (229) to open and close automatically according to the preset program, and transports the screened particle material to the quantitative addition component (24) through the pipeline.

4. The cavity-added granular filter rod composite molding equipment according to claim 3, characterized in that, The quantitative addition component (24) is located downstream of the particle screening component (22) and mainly consists of a quantitative disc (241) and an addition hopper (242). The quantitative disc (241) is a rotary volumetric metering device with several U-shaped grooves of equal volume on its outer circumference. After rotating to a set angle, it releases a quantitative amount of material into the addition hopper (242) below. The addition hopper (242) is located on an annular belt and has a funnel-shaped structure. The rotation speed and start / stop status of the quantitative disc (241) are controlled in real time by the control system (26) according to the filter rod conveying speed and cavity length to ensure that the particle filling amount in each cavity is consistent.

5. The cavity-added granular filter rod composite molding equipment according to claim 4, characterized in that, The cavity particle addition unit (2) is also provided with a residual material recovery component (25). The residual material recovery component (25) consists of a left residual material recovery device (251) and a right residual material recovery device (252), which are symmetrically arranged on both sides of the addition hopper (242) to form a suction-type recovery channel. The right residual material recovery device (252) is directly fixed to the drive plate of the quantitative addition component (24), and its fan-shaped suction port is approximately in contact with the outer wall of the addition hopper (242). The left residual material recovery device (251) is installed on the support adjustment component (23) and can be raised and lowered synchronously with the adjustment mechanism. The left residual material recovery device (251) and the right residual material recovery device (252) are both connected to the same negative pressure source through independent pipes, and the particle material enters the sealed recovery bucket through the pipes.

6. The cavity-adding granular filter rod composite molding equipment according to claim 5, characterized in that, The cavity particle adding unit (2) also includes a support adjustment component (23). The support adjustment component (23) is set between the filter rod composite unit (1) and the filter rod forming unit (3). The particle screening component (22), the quantitative adding component (24), and the residual material recovery component (25) are all set on the support adjustment component (23). The support adjustment component (23) adjusts the vertical position of the quantitative adding component (24) in real time through the cylinder and the slide rail component to ensure that the particle material landing point and the filter rod on the forming smoke gun are always at the optimal distance allowed by the process.

7. The cavity-adding granular filter rod composite molding equipment according to any one of claims 2-6, characterized in that, The control system (26) communicates with the control systems of the filter rod composite unit (1) and the filter rod forming unit (3) via the EtherCAT bus, and collects the running speed signal of the main motor of the filter rod forming unit (3) in real time. The control system (26) has a built-in PLC, which processes the collected speed data and adjusts the running speed of the quantitative addition component (24) to achieve precise start and stop.

8. The cavity-adding granular filter rod composite molding equipment according to claim 7, characterized in that, The control system (26) is equipped with a high level sensor (261), a low level sensor (262) and a residual material sensor; the high level sensor (261) is installed above the particle screening device (225), and the low level sensor (262) is placed below the distributor (227). The two are used to monitor the particle level height at the corresponding position in real time and feed the detection signal back to the control system (26). The residual material sensor is located inside the sealed barrel (211) to realize full monitoring of the material status; the control system (26) analyzes the signals of each sensor and automatically adjusts the start and stop of the feeding component (21), the working frequency of the particle screening component (22), and the start and stop of the residual material recycling component (25).

9. The cavity-added granular filter rod composite molding equipment according to claim 1, characterized in that, The filter rod forming unit (3) includes a refrigeration unit (31) and a glue supply system (32). The refrigeration unit (31) is used to provide condensate to the smoke gun component (33) of the filter rod forming unit (3) to ensure the shaping effect of the filter rod; the glue supply system (32) applies glue evenly to the center and edge of the forming paper to realize the synchronous winding and forming of the filter rod and the forming paper, and prevents the filter rod from bursting during the forming process.

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