Multi-channel filter stick forming device

Abstract

The utility model belongs to the field of filter tip manufacturing, and particularly relates to a multi-channel filter stick forming device which comprises a fixed core rod, a first wire feeding nozzle assembly, a forming die assembly and a heating assembly, the first wire feeding nozzle assembly surrounds the periphery of the fixed core rod, and a feeding channel is formed between the inner side of the first wire feeding nozzle assembly and the outer surface of the fixed core rod. Under the action of compressed air, fiber tows pass through the first wire feeding nozzle assembly, surround the fixed core rod under the guiding action of the fixed core rod, enter a cavity in the forming die sleeve and are softened under the action of the heating assembly, the cavity can be rapidly and evenly filled with the softened fiber tows, and meanwhile the multiple core die rods are evenly wrapped with the softened fiber tows; the plurality of core mold rods are used for forming multiple channels, and the fiber tows are adhered into a whole to form the multi-channel filter rod. Through fiber tow forming, the process is simple, the size is easy to control, the size consistency of the produced multi-channel filter stick is high, and the fiber tows flowing at a certain speed do not easily cause blockage of a forming die assembly.

Description

Technical Field

[0001] This application belongs to the field of filter tip manufacturing, and specifically relates to a multi-channel filter rod forming device. Background Technology

[0002] Currently, most multi-channel filter rods are formed by extruding silicone and microporous foam materials from a mold. The manufacturing process is relatively complex, and it is difficult to control dimensions such as circumference and length, resulting in low dimensional consistency of the multi-channel filter rods. At the same time, the extrusion of silicone and microporous foam materials is slow, circumference control is difficult, and clogging is prone to occur during the composite molding process, making it difficult to process. Utility Model Content

[0003] The technical problem to be solved by this application is to provide a multi-channel filter rod forming device, which is formed by fiber bundles, has a simple process, is easy to control in size, and produces multi-channel filter rods with high dimensional consistency.

[0004] This application provides a multi-channel filter rod forming device, comprising:

[0005] Fixed mandrel;

[0006] A first wire feeding nozzle assembly surrounds the outer periphery of a fixed mandrel, and a feeding channel is formed between the inner side of the first wire feeding nozzle assembly and the outer surface of the fixed mandrel for passing compressed air and fiber bundles.

[0007] The forming die assembly includes a core die base connected to a wire feeding nozzle assembly, a plurality of core die rods disposed on the core die base, and a forming die sleeve surrounding the plurality of core die rods. The inner side of the forming die sleeve has a cavity, and the cavity is connected to a feeding channel.

[0008] Heating components surround the outer periphery of the forming mold assembly.

[0009] Optionally, the inner side of the wire feeding nozzle assembly has an inner cavity, the fixed mandrel passes through the inner cavity, the wire feeding nozzle assembly has a compressed air inlet, an inner annular cavity communicating with the compressed air inlet, and an annular gap communicating with the inner annular cavity and the inner cavity, the outlet of the annular gap facing the forming mold assembly.

[0010] Optionally, the inner cavity is funnel-shaped, and the small port of the inner cavity is connected to the core mold base.

[0011] Optionally, the plurality of core mold rods are evenly distributed circumferentially.

[0012] Optionally, the forming mold assembly further includes a central mold rod connected to the end of a fixed mandrel, with a plurality of mandrels surrounding the central mold rod.

[0013] Optionally, the core mold base has a plurality of circumferentially distributed slots, and the plurality of core mold rods are respectively inserted into the plurality of slots and interference fit.

[0014] Optionally, the core mold base has a conical cavity and a plurality of arc-shaped grooves located on the wall of the conical cavity and distributed circumferentially, with the small port of the conical cavity close to the forming mold sleeve.

[0015] Optionally, the forming mold assembly further includes a concentric sleeve, which is sleeved on the outer periphery of the core mold base and the forming mold sleeve, so that the core mold base and the forming mold sleeve are coaxially arranged.

[0016] Optionally, the heating assembly includes a mounting base and a mold sleeve. The mounting base is fitted around the outer periphery of the mold sleeve, and the mold sleeve is fitted around the outer periphery of the forming mold assembly. The heating assembly has a steam inlet channel and a steam outlet channel penetrating the mounting base and the mold sleeve. The forming mold sleeve has multiple steam inlet holes and multiple steam outlet holes communicating with a steam inlet. The outer wall of the forming mold sleeve has an inlet annular groove and an outlet annular groove. The inlet annular groove communicates with the steam inlet channel and the multiple steam inlet holes, and the outlet annular groove communicates with the steam outlet channel and the multiple steam outlet holes.

[0017] Optionally, the forming apparatus further includes a second wire feeding nozzle assembly, which surrounds the outer periphery of the fixed mandrel and is located on the side of the first wire feeding nozzle assembly away from the forming die assembly;

[0018] And / or, the end of the fixed mandrel away from the wire feeding nozzle assembly is connected to a positioning pin, which is connected to an external fixing device.

[0019] The beneficial effects of this application are that, under the action of compressed air, the fiber bundle passes through the feeding nozzle assembly and, guided by the fixed mandrel, surrounds the fixed mandrel and enters the cavity inside the forming mold. Under the action of the heating assembly, the fiber bundle softens, rapidly and evenly filling the cavity and simultaneously wrapping multiple mandrels. These multiple mandrels form a multi-channel system, with the fiber bundles adhering to each other to form a multi-channel filter rod. Then, external force pulls the multi-channel filter rod out of the forming device, creating a multi-channel filter rod that drives subsequent fiber bundles to continuously enter the cavity. Fiber bundle forming is a simple process with easy dimensional control, resulting in highly consistent dimensions in the produced multi-channel filter rods. Furthermore, the fiber bundles flowing at a certain speed are less likely to clog the forming mold assembly and can maintain a high production speed. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the forming apparatus provided in this application;

[0021] Figure 2 for Figure 1 Left view of the forming device;

[0022] Figure 3 for Figure 2 AA section view in the middle;

[0023] Figure 4 for Figure 3 A schematic diagram of the assembly of the wire feeding nozzle assembly, the forming die assembly, and the heating assembly.

[0024] Figure 5 This is a partial structural schematic diagram of the forming mold assembly provided in this application;

[0025] Figure 6 A cross-sectional view of the forming mold provided in this application;

[0026] Figure 7 This is a schematic diagram of the assembly of the nozzle holder and the core mold rod provided in this application;

[0027] Figure 8 for Figure 7 The left view.

[0028] In the diagram: 100, fixed mandrel; 110, locating pin; 200, wire feeding nozzle assembly one; 201, inner cavity; 202, compressed air inlet; 203, inner annular cavity; 204, annular gap; 210, ejector nozzle; 220, nozzle seat; 300, forming die assembly; 310, mandrel seat; 311, slot; 312, conical cavity; 313, arc groove; 320, forming die sleeve; 321. Cavity; 322. Steam inlet; 323. Steam outlet; 324. Inlet annular groove; 325. Outlet annular groove; 330. Core mold rod; 340. Center mold rod; 350. Concentric sleeve; 400. Heating assembly; 410. Mounting base; 420. Mold seal; 401. Steam inlet channel; 402. Steam outlet channel; 403. Mounting hole; 500. Wire feeding nozzle assembly two. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0030] like Figure 1-8As shown, this application provides a multi-channel filter rod forming device, comprising: a fixed mandrel 100, a fiber feeding nozzle assembly 200, a forming mold assembly 300, and a heating assembly 400; wherein, the fiber feeding nozzle assembly 200 surrounds the outer periphery of the fixed mandrel 100, and a feeding channel is formed between the inner side of the fiber feeding nozzle assembly 200 and the outer surface of the fixed mandrel 100 for passing compressed air and fiber bundles; the forming mold assembly 300 includes a mandrel base 310 connected to the fiber feeding nozzle assembly 200, a plurality of mandrel rods 330 disposed on the mandrel base 310, and a forming mold sleeve 320 surrounding the plurality of mandrel rods 330, the inner side of the forming mold sleeve 320 having a cavity 321, the cavity 321 communicating with the feeding channel; the heating assembly 400 surrounds the outer periphery of the forming mold assembly 300.

[0031] Compared with existing technologies, the multi-channel filter rod forming apparatus provided in this application, under the action of compressed air, allows fiber bundles to pass through the fiber feeding nozzle assembly 200 and, guided by the fixed mandrel 100, surround the fixed mandrel 100 and enter the cavity 321 inside the forming mold sleeve 320. Under the action of the heating assembly 400, the fiber bundles soften, rapidly and evenly filling the cavity 321 and simultaneously wrapping multiple mandrels 330. These multiple mandrels 330 form multiple channels, and the fiber bundles adhere to each other to form a multi-channel filter rod. Then, an external force (usually a smoke gun) is used to pull the multi-channel filter rod out of the forming apparatus, driving subsequent fiber bundles to continuously enter the cavity 321. Fiber bundle forming is a simple process, with easily controllable dimensions, resulting in high dimensional consistency of the produced multi-channel filter rods. Furthermore, the fiber bundles flowing at a certain speed are less likely to cause blockage of the forming mold assembly 300 and can maintain a high production speed.

[0032] It should be noted that the fiber bundles are made of cellulose acetate, polypropylene, or polypropylene fibers. A small amount of plasticizer may be added if necessary. Plasticizers include, but are not limited to, triacetin.

[0033] In one embodiment, such as Figure 3 and Figure 4As shown, the inner side of the filament feeding nozzle assembly 200 has an inner cavity 201, and the fixed mandrel 100 passes through the inner cavity 201. The filament feeding nozzle assembly 200 has a compressed air inlet 202, an inner annular cavity 203 communicating with the compressed air inlet 202, and an annular gap 204 communicating with the inner annular cavity 203 and the inner cavity 201. The outlet of the annular gap 204 faces the forming mold assembly 300. Specifically, the factory's air compressor station system supplies compressed air, which enters through the compressed air inlet 202 and passes through the inner annular cavity 203 and the annular gap 204 in sequence. Under the buffering and air storage effect of the inner annular cavity 203, the airflow in the annular gap 204 is relatively stable. Under the guidance of the annular gap 204, the compressed air enters the mold cavity 321 with a large flow velocity, thereby forming a Bernoulli phenomenon, which can continuously deliver fiber bundles into the mold cavity 321.

[0034] In one embodiment, such as Figure 4 As shown, the wire feeding nozzle assembly 200 includes an ejector nozzle 210 and a nozzle seat 220. The compressed air inlet 202 is on the ejector nozzle 210. Most of the inner annular cavity 203 is on the ejector nozzle 210, and a small portion is on the nozzle seat 220. The ejector nozzle 210 and nozzle seat 220 are connected by screws to form a complete inner annular cavity 203. The annular gap 204 is formed by the gap between the ejector nozzle 210 and the nozzle seat 220. This facilitates machining. The nozzle seat 220 abuts against the mandrel base 310, and the nozzle seat 220 is connected to the heating assembly 400 by screws or bolts.

[0035] In one embodiment, the inner cavity 201 is funnel-shaped, and the small port of the inner cavity 201 is connected to the mandrel base 310. This facilitates guiding the fiber bundle into the fiber feeding nozzle assembly 200 and provides a moving compression effect on the fiber bundle.

[0036] In one embodiment, such as Figure 7 and Figure 8 As shown, multiple core mold rods 330 are evenly distributed circumferentially. Specifically, the number of core mold rods 330 is 2-10, preferably 6. The portion of the core mold rod 330 used to form the filter rod channel is cylindrical, but can also be a polygonal prism or an elliptical cylinder. The cross-sectional area of ​​the portion of a single core mold rod 330 used to form the filter rod channel does not exceed one-tenth of the cross-sectional area of ​​the filter rod.

[0037] In one embodiment, such as Figure 3 and Figure 4As shown, the forming mold assembly 300 also includes a central mold rod 340 connected to the end of the fixed mandrel 100, with a plurality of mandrels 330 surrounding the central mold rod 340. Specifically, the central mold rod 340 is used to form a channel located in the middle of the filter rod. The central mold rod 340 can be interference-fitted into the end of the mandrel, or it can be screwed or welded to the end of the mandrel. The central mold rod 340 can be cylindrical, or it can be a polygonal prism or an elliptical cylinder.

[0038] In one embodiment, the cross-sectional area of ​​the central mold rod 340 is larger than the cross-sectional area of ​​the individual core mold rod 330. In some embodiments, the cross-sectional area of ​​the central mold rod 340 is equal to the cross-sectional area of ​​the individual core mold rod 330. In other embodiments, the cross-sectional area of ​​the central mold rod 340 is smaller than the cross-sectional area of ​​the individual core mold rod 330.

[0039] In one embodiment, such as Figure 5 As shown, the core mold base 310 has a plurality of circumferentially distributed slots 311, and a plurality of core mold rods 330 are respectively inserted into the plurality of slots 311 and are interference-fitted. In some embodiments, the plurality of core mold rods 330 may also be welded to the core mold base 310.

[0040] In one embodiment, such as Figure 5 As shown, the core mold base 310 has a conical cavity 312 and multiple arc-shaped grooves 313 located on the wall of the conical cavity 312 and distributed circumferentially. The small port of the conical cavity 312 is close to the forming mold sleeve 320. The conical cavity 312 serves to guide the fiber bundles, and the multiple arc-shaped grooves 313 serve to ensure that a sufficient number of fiber bundles pass through.

[0041] In one embodiment, the forming mold assembly 300 further includes a concentric sleeve 350, which is sleeved on the outer periphery of the core mold base 310 and the forming mold sleeve 320, so that the core mold base 310 and the forming mold sleeve 320 are coaxially arranged. Specifically, a portion of the inner sidewall of the concentric sleeve 350 is in contact with the outer side of the core mold base 310, and another portion is in contact with the outer side of the forming mold sleeve 320. The heating assembly 400 has a mounting hole 403, and the concentric sleeve 350 has a screw hole corresponding to the mounting hole 403. The heating assembly 400 and the concentric sleeve 350 are connected together by bolts, with the ends of the bolts abutting against the core mold base 310. The heating assembly 400 and the forming mold sleeve 320 are connected by other bolts.

[0042] In one embodiment, a sealing ring is provided between the core mold base 310 and the forming mold sleeve 320 to improve the airtightness of the joint between the core mold base 310 and the forming mold sleeve 320.

[0043] In one embodiment, such as Figure 1 , Figure 3 , Figure 4As shown, the heating assembly 400 includes a mounting base 410 and a mold sleeve 420. The mounting base 410 is sleeved on the outer periphery of the mold sleeve 420, and the mold sleeve 420 is sleeved on the outer periphery of the forming mold assembly 300. The heating assembly 400 has a steam inlet channel 401 and a steam outlet channel 402 that penetrate the mounting base 410 and the mold sleeve 420. The forming mold sleeve 320 has a plurality of steam inlet holes 322 and a plurality of steam outlet holes 323 that communicate with the steam inlet. The outer side wall of the forming mold sleeve 320 has an inlet annular groove 324 and an outlet annular groove 325. The inlet annular groove 324 communicates with the steam inlet channel 401 and the plurality of steam inlet holes 322, and the outlet annular groove 325 communicates with the steam outlet channel 402 and the plurality of steam outlet holes 323. Specifically, steam at a certain pressure is used as the heating source and enters the annular groove 324 from the steam inlet channel 401, thereby evenly introducing multiple steam inlet holes 322 to heat the fiber bundles more uniformly. The steam enters the right end of the inner cavity 201 and mixes with compressed air through convection before being discharged sequentially through multiple steam outlet holes 323, the annular groove 325, and the steam outlet channel 402. Designing multiple steam inlet holes 322 and multiple steam outlet holes 323 can prevent the fiber bundles from entering them, ensuring that the fiber bundles are mainly used to form filter rods.

[0044] It should be noted that the number of steam outlet channels 402 is 1, 2, 3, 4 or more. Setting multiple steam outlet channels 402 is to ensure airflow speed by discharging steam and compressed air, thereby ensuring the smoothness and speed of conveying fiber bundles.

[0045] In one embodiment, an air extraction system can be connected to the outside of the steam outlet channel 402 to increase the airflow speed, thereby increasing the fiber bundle conveying speed and ensuring the smoothness and speed of fiber bundle conveying.

[0046] It should be noted that, Figure 4 The blue arrows indicate the direction of compressed air flow, the red arrows indicate the direction of high-temperature steam flow, and the orange arrows indicate the direction of the mixture of steam and compressed air flow.

[0047] In one embodiment, the forming apparatus further includes a second filament feeding nozzle assembly 500, which surrounds the outer periphery of the fixed mandrel 100 and is located on the side of the first filament feeding nozzle assembly 200 away from the forming die assembly 300. Specifically, the second filament feeding nozzle assembly 500 has the same structure as the first filament feeding nozzle assembly 200, or differs only in some dimensions. The combined use of the first filament feeding nozzle assembly 200 and the second filament feeding nozzle assembly 500 can further feed the filaments, ensuring the amount of filaments fed (the amount of fiber bundles delivered).

[0048] In one embodiment, a positioning pin 110 is connected to the end of the fixed mandrel 100 away from the wire feeding nozzle assembly 200, and the positioning pin 110 is connected to an external fixing device. Specifically, one end of the fixed mandrel 100 is engaged with the positioning pin 110, and the other end is fitted with the mandrel base 310 to ensure the stability of the fixed mandrel 100.

[0049] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0050] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. A multi-channel filter rod forming device, characterized in that, include: Fixed mandrel (100); A first feeding nozzle assembly (200) surrounds the outer periphery of a fixed mandrel (100), and a feeding channel is formed between the inner side of the first feeding nozzle assembly (200) and the outer surface of the fixed mandrel (100) for passing compressed air and fiber bundles. The forming die assembly (300) includes a core die holder (310) connected to a wire feeding nozzle assembly (200), a plurality of core die rods (330) disposed on the core die holder (310), and a forming die sleeve (320) surrounding the plurality of core die rods (330). The inner side of the forming die sleeve (320) has a cavity (321) and the cavity (321) is connected to the feeding channel. Heating component (400) surrounds the outer periphery of forming mold component (300).

2. The forming apparatus according to claim 1, characterized in that, The inner side of the wire feeding nozzle assembly (200) has an inner cavity (201), the fixed mandrel (100) passes through the inner cavity (201), the wire feeding nozzle assembly (200) has a compressed air inlet (202), an inner annular cavity (203) communicating with the compressed air inlet (202), and an annular gap (204) communicating with the inner annular cavity (203) and the inner cavity (201), the outlet of the annular gap (204) facing the forming mold assembly (300).

3. The forming apparatus according to claim 2, characterized in that, The inner cavity (201) is funnel-shaped, and the small port of the inner cavity (201) is connected to the core mold base (310).

4. The forming apparatus according to claim 1, characterized in that, The multiple core mold rods (330) are evenly distributed circumferentially.

5. The forming apparatus according to claim 1, characterized in that, The forming mold assembly (300) also includes a central mold rod (340) connected to the end of the fixed mandrel (100), and a plurality of the mandrels (330) surround the central mold rod (340).

6. The forming apparatus according to claim 1, characterized in that, The core mold base (310) has a plurality of slots (311) distributed circumferentially, and a plurality of core mold rods (330) are respectively inserted into the plurality of slots (311) and are interference-fitted.

7. The forming apparatus according to claim 1, characterized in that, The core mold base (310) has a conical cavity (312) and a plurality of arc-shaped grooves (313) located on the wall of the conical cavity (312) and distributed circumferentially. The small port of the conical cavity (312) is close to the forming mold sleeve (320).

8. The forming apparatus according to claim 1, characterized in that, The forming mold assembly (300) also includes a concentric sleeve (350), which is sleeved on the outer periphery of the core mold base (310) and the forming mold sleeve (320), so that the core mold base (310) and the forming mold sleeve (320) are coaxially arranged.

9. The forming apparatus according to claim 1, characterized in that, The heating assembly (400) includes a mounting base (410) and a mold sleeve (420). The mounting base (410) is fitted around the outer periphery of the mold sleeve (420), and the mold sleeve (420) is fitted around the outer periphery of the forming mold assembly (300). The heating assembly (400) has a steam inlet channel (401) and a steam outlet channel (402) penetrating the mounting base (410) and the mold sleeve (420). The forming mold sleeve (320) has... Multiple steam inlet holes (322) and multiple steam outlet holes (323) are connected to the steam inlet; the outer wall of the forming mold sleeve (320) has an inlet annular groove (324) and an outlet annular groove (325), the inlet annular groove (324) is connected to the steam inlet channel (401) and multiple steam inlet holes (322), and the outlet annular groove (325) is connected to the steam outlet channel (402) and multiple steam outlet holes (323).

10. The forming apparatus according to any one of claims 1-9, characterized in that, It also includes a second wire feeding nozzle assembly (500), which surrounds the outer periphery of the fixed mandrel (100) and is located on the side of the first wire feeding nozzle assembly (200) away from the forming die assembly (300); And / or, the end of the fixed mandrel (100) away from the wire feeding nozzle assembly (200) is connected to a positioning pin (110), which is connected to an external fixing device.

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