Hollow filter rod forming device

Abstract

The utility model discloses a hollow filter stick forming device, which comprises a high-pressure nozzle, a wire outlet cylinder, a wire outlet nozzle, a wire outlet nozzle and a wire outlet nozzle, the wire feeding part comprises a wire feeding section extending into the barrel cavity, a wire feeding section and a connecting rod, the wire feeding section comprises a first wire feeding channel and a mounting base used for mounting the second end of the connecting rod, and the wire feeding section comprises a second wire feeding channel communicated with the first wire feeding channel; an outlet of the second wire feeding channel is located in the barrel cavity, the cross sectional area of the outlet of the second wire feeding channel is smaller than that of an inlet of the first wire feeding channel, and the relative angle between the wire feeding section and the wire feeding section in the moving direction of the wire bundle can be adjusted. The wire feeding section is connected with the surface of the cavity wall of the cylinder cavity in a sealed mode, an annular cavity communicated with the air inlet is formed between the outer surface of the wire feeding section and the cylinder cavity, the size of the cross section area of the annular cavity is gradually reduced in the moving direction of the tows, and the relative position of the wire feeding section and the cylinder cavity can be adjusted in the moving direction of the tows.

Description

Technical Field

[0001] The utility model relates to the technical field of cigarette equipment, in particular to a hollow filter rod forming device. Background Art

[0002] In the filter rod production process, after the opener opens the tow, the high-pressure nozzle of the hollow filter rod forming device gathers the ribbon-shaped tow around the connecting rod connected to the core shaft to form a hollow bundled tow and uses high-pressure airflow to make the bundled tow fluffy. After the tow passes through the core shaft, it is formed by the steam component and the mold component to form a filter rod. The high-pressure nozzle of the existing hollow filter rod forming device, after a stable airflow is introduced, uses the airflow to fluff the tow, but cannot conveniently adjust the tow fluffing capacity according to different conditions of the tow, such as the thickness of the tow, the material of the tow, etc. Summary of the invention

[0003] The utility model aims to provide a hollow filter rod forming device with a high-pressure nozzle which can conveniently adjust the fluffing ability of a tow.

[0004] The utility model discloses a hollow filter rod forming device, comprising:

[0005] High pressure nozzles, including:

[0006] A wire outlet drum, comprising a drum cavity and an air inlet provided on the drum wall and communicating with the drum cavity;

[0007] A wire feeding section, used for entering a wire bundle and outputting the wire bundle to the barrel cavity, comprises a wire feeding section extending into the barrel cavity, a wire feeding section located upstream of the wire feeding section along the moving direction of the wire bundle and connected to the wire feeding section, and a connecting rod having a first end connected to a core shaft forming a hollow cavity of a filter rod and passing through the wire feeding section, the wire feeding section comprises a first wire feeding channel and a mounting seat for mounting the second end of the connecting rod, the projection of the mounting seat on a plane perpendicular to the moving direction of the wire bundle is located in the middle of the first wire feeding channel, and the wire feeding section comprises a second wire feeding channel connected to the first wire feeding channel The outlet of the second wire feeding channel is located in the barrel cavity and its cross-sectional area is smaller than the cross-sectional area of the inlet of the first wire feeding channel. The relative angle between the wire feeding section and the wire feeding section is adjustable around the moving direction of the wire bundle. The wire feeding section is sealed and connected to the wall surface of the barrel cavity, and an annular cavity connected to the air inlet is formed between the outer surface of the wire feeding section and the barrel cavity. Along the moving direction of the wire bundle, the cross-sectional area of the annular cavity gradually decreases. Along the moving direction of the wire bundle, the relative position of the wire feeding section and the barrel cavity is adjustable.

[0008] In some embodiments, a first threaded connection structure is further provided between the wire feeding section and the inner wall surface of the cylinder cavity. The wire feeding section adjusts its relative position with respect to the cylinder cavity along the moving direction of the wire bundle through the first threaded connection structure and realizes the sealed connection with the inner wall surface.

[0009] In some embodiments, the outer surface of the wire feeding section includes a conical surface, and the inner wall surface of the cylinder cavity is a conical surface coaxial with the outer surface of the wire feeding section.

[0010] In some embodiments, a second threaded connection structure is further provided between the wire inlet section and the wire feeding section. The wire inlet section adjusts the relative angle with respect to the wire feeding section around the moving direction of the wire bundle through the second threaded connection structure.

[0011] In some embodiments, the first wire inlet channel is a circular channel, the mounting seat is a cylindrical mounting seat located in the middle of the first wire inlet channel, the wire inlet section further includes a connecting portion connecting the outer wall surface of the cylindrical mounting seat and the wall surface of the first wire inlet channel. The connecting portion includes a first surface and a second surface located on opposite sides and connecting the outer wall surface of the cylindrical mounting seat and the wall surface of the first wire inlet channel. Both the first surface and the second surface are tangent to the outer surface of the cylindrical mounting seat and the wall surface of the first wire inlet channel at the same time.

[0012] In some embodiments, the second wire inlet channel is a conical channel.

[0013] In some embodiments, a pre-convergence component is further provided upstream of the wire inlet section along the moving direction of the wire bundle. The pre-convergence component includes more than one pre-convergence mechanism. The pre-convergence mechanism includes a frame and a pre-convergence member connected to the frame. The pre-convergence member includes a U-shaped member, and the U-shaped member is used to surround the wire bundle and apply pressure to the wire bundle before the wire bundle enters the first wire inlet channel.

[0014] In some embodiments, the pre-convergence component further includes an intermediate component connected between the frame and the pre-convergence member. The pre-convergence member is rotatably and adjustably mounted on the intermediate component with respect to the intermediate component.

[0015] In some embodiments, the intermediate component includes a first component connected to the frame and a second component slidable relative to the first component. The pre-convergence member is rotatably and adjustably mounted on the second component with respect to the second component.

[0016] In some embodiments, the pre-convergence component includes a plurality of pre-convergence mechanisms, and the plurality of pre-convergence mechanisms are arranged at intervals along the moving direction of the wire bundle.

[0017] Based on the hollow filter rod forming device provided by the present utility model, when the high-pressure nozzle converges the tow around the connecting rod to form a bundled tow and fluffs the bundled tow, it can adjust the fluffing ability according to different conditions of the tow, making the fluffing effect more matched with the tow, and the adjustment process is convenient and reliable.

[0018] Other features and advantages of the present utility model will become clear through the following detailed description of the exemplary embodiments of the present utility model with reference to the accompanying drawings. Description of the Drawings

[0019] The drawings described herein are used to provide a further understanding of the present utility model and form a part of this application. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0020] Figure 1 It is a schematic structural diagram of a part of the structure of the hollow filter rod forming device according to an embodiment of the present utility model;

[0021] Figure 2 It is a schematic structural diagram of a part of the structure of the high-pressure nozzle of the hollow filter rod forming device according to another embodiment of the present utility model;

[0022] Figure 3 It is a schematic structural diagram of a part of the structure of the high-pressure nozzle of the hollow filter rod forming device according to still another embodiment of the present utility model;

[0023] Figure 4 It is a cross-sectional structural diagram of a part of the structure of the high-pressure nozzle of the hollow filter rod forming device according to still another embodiment of the present utility model;

[0024] Figure 5 Is Figure 4 An exploded view of the cross-sectional structure of the shown structure;

[0025] Figure 6 It is a schematic structural diagram of a part of the structure of the high-pressure nozzle of the hollow filter rod forming device according to still another embodiment of the present utility model;

[0026] Figure 7 It is a schematic structural diagram of the pre-convergence mechanism of the hollow filter rod forming device according to still another embodiment of the present utility model;

[0027] Figure 8 Is Figure 7 A schematic structural diagram of the shown structure from another angle. Detailed Embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0029] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the description. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0030] In the description of the present invention, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without further statement, the above terms have no special meaning and thus cannot be construed as limiting the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" should be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface", "upper", etc., may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figure is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "beneath" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used herein.

[0033] In the prior art, when a hollow filter rod forming device, such as a filter rod forming machine, produces a hollow filter rod, after the opener loosens the tow, when the tow is sent to the high-pressure nozzle for gathering and fluffing, a connecting rod connecting the core shaft and a mounting seat for mounting the connecting rod are installed in the high-pressure nozzle, and the fluffing ability of the high-pressure nozzle for the tow cannot be adjusted.

[0034] As Figures 1 to 6 shown, the hollow filter rod forming device of this embodiment includes a high-pressure nozzle 610. The high-pressure nozzle 610 includes a wire outlet cylinder 1 and a wire inlet part.

[0035] The wire outlet cylinder 1 includes a cylinder cavity and an air inlet communicated with the cylinder cavity and provided on its cylinder wall. The air inlet is connected to an air supply pipe, and high-pressure air is input through the air supply pipe and sent into the cylinder cavity of the wire outlet cylinder 1 through the air inlet.

[0036] The wire inlet part is used for the tow 600 to enter and output the tow 600 to the cylinder cavity. In the embodiment shown in the figure, the tow 600 starts as a flat ribbon-shaped tow strip and is sent to the high-pressure nozzle. After being gathered by a pre-gathering device, it is sent into the wire inlet part. After further gathering in the wire inlet part, it is output from the wire inlet part to the cylinder cavity, and then output from the cylinder cavity to the outside of the wire outlet cylinder. After the high-pressure air enters the cylinder cavity and is output from the cylinder cavity, it fluffs the tow outside the wire outlet cylinder 1, as Figure 1 shown, to make the tow form a fluff similar to a spherical shape.

[0037] The wire inlet part includes a wire feeding section 2 extending into the cylinder cavity, a wire inlet section 3 located upstream of the wire feeding section 2 along the moving direction of the tow 600 and connected to the wire feeding section 2, and a connecting rod 4. The moving direction of the tow 600 is as in Figure 1In the illustrated embodiment, the direction is from right to left, that is, along the axis of the high-pressure nozzle from the tow inlet of the high-pressure nozzle to the tow outlet (right and left are referenced with respect to the reader's left and right directions). The connecting rod 4 passes through the wire feeding section 2, and the first end of the connecting rod 4 is used to connect to the mandrel 620 that forms the hollow cavity of the filter rod. The wire feeding section 3 includes a first wire feeding channel 31 and a mounting seat 32 for mounting the second end of the connecting rod 4, and the second end of the connecting rod is mounted on the mounting seat 32. After the tow enters the high-pressure nozzle, it gradually converges around the connecting rod, and then exits the high-pressure nozzle in a circular shape that nearly completely surrounds the connecting rod. After passing through the mandrel 620, it is sent into the steam component and the die component in a nearly hollow circular shape to form a hollow filter rod. In the plane perpendicular to the moving direction of the tow 600 (in the illustrated embodiment, it is also the cross-section of the high-pressure nozzle), the projection of the mounting seat 32 is located in the middle of the first wire feeding channel 31, so that the tow can gradually converge towards the middle after entering the wire feeding section. The wire feeding section 2 includes a second wire feeding channel 22 that communicates with the first wire feeding channel 31, and the outlet of the second wire feeding channel 22 is located in the cylinder cavity and the cross-sectional area thereof is smaller than the cross-sectional area of the inlet of the first wire feeding channel 31. The relative angle between the wire feeding section 3 and the wire feeding section 2 around the moving direction of the tow 600 can be adjusted. In the illustrated embodiment, that is, the wire feeding section 3 and the wire feeding section 2 can rotate relative to each other around the axis of the high-pressure nozzle to adjust the relative angle between the two. The wire feeding section 2 is sealingly connected to the inner wall surface of the cylinder cavity, and an annular cavity 120 that communicates with the air inlet is formed between the outer surface of the wire feeding section 2 and the cylinder cavity. Along the moving direction of the tow 600, the cross-sectional area of the annular cavity 120 gradually decreases. Along the moving direction of the tow 600, that is, the axis direction of the high-pressure nozzle in the illustrated embodiment, the relative position between the wire feeding section 2 and the cylinder cavity can be adjusted. When the relative position between the wire feeding section 2 and the cylinder cavity is adjusted along the axis of the high-pressure nozzle, as Figure 4 and Figure 6 shown, the length of the annular cavity 120 along the axis of the high-pressure nozzle is also adjusted, and the cross-sectional area of the high-pressure air flow when it exits the annular cavity also changes, so that the speed of the high-pressure air flow output to the outside of the wire outlet cylinder also changes, thereby being able to adjust the fluffing ability of the tow. Since the relative angle between the wire feeding section 3 and the wire feeding section 2 around the moving direction of the tow 600 can be adjusted, when the relative position between the wire feeding section 2 and the cylinder cavity is adjusted along the axis of the high-pressure nozzle, by adjusting the relative angle between the wire feeding section 3 and the wire feeding section 2 around the moving direction of the tow 600, the angular position of the wire feeding section 3 around the moving direction of the tow 600 can be kept unchanged, and the tow 600 can enter the first channel without being affected and can still smoothly enter the first channel, finally forming a stable and reliable hollow filter rod.

[0038] In the hollow filter rod forming device of this embodiment, when the high-pressure nozzle 610 converges the tow 600 around the connecting rod 4 to form a bundled tow 600 and fluffs the bundled tow 600, it can adjust the fluffing ability according to different conditions of the tow 600, making the fluffing effect more matched with the tow 600, and the adjustment process is convenient and reliable.

[0039] In some embodiments, as Figures 4 to 6 shown, the hollow filter rod forming device further includes a first threaded connection structure 51 provided between the wire feeding section 2 and the surface of the cavity wall of the cylindrical cavity. The wire feeding section 2 adjusts its relative position with respect to the cylindrical cavity along the moving direction of the tow 600 and realizes its sealed connection with the cavity wall surface through the first threaded connection structure 51. In the embodiment shown in the figure, the first threaded connection structure 51 includes an internal thread provided on the surface of the cavity wall of the cylindrical cavity and an external thread provided on the outer surface of the wire feeding section 2 that is in threaded cooperation with the above internal thread. By rotating the wire feeding section 2, the relative position between the wire feeding section 2 and the cylindrical cavity along the moving direction of the tow can be conveniently adjusted. At the same time, the first threaded connection structure 51 forms a comb-tooth sealing structure between the wire feeding section 2 and the cylindrical cavity, which can form an effective sealed connection and seal the high-pressure air flow entering the cylindrical cavity.

[0040] In some embodiments, as Figure 4 shown, the outer surface of the wire feeding section 2 includes a conical surface, and the cavity wall surface of the cylindrical cavity is a conical surface coaxial with the outer surface of the wire feeding section 2. This embodiment can form a conical annular cavity between the wire feeding section and the cylindrical cavity. When passing through the annular cavity, the flow rate of the high-pressure air flow can increase stably, and at the same time, the flow rate of the high-pressure air flow can also be conveniently adjusted.

[0041] In some embodiments, as shown in the figure, the hollow filter rod forming device further includes a second threaded connection structure 52 provided between the wire inlet section 3 and the wire feeding section 2. The wire inlet section 3 adjusts the relative angle with respect to the wire feeding section 2 around the moving direction of the tow 600 through the second threaded connection structure 52. The structure of the second threaded connection structure 52 is similar to that of the first threaded connection structure 51. In the embodiment shown in the figure, it includes an external thread provided on the wire inlet section 3 and an internal thread provided on the wire feeding section 2 that is in cooperation with the external thread. In the embodiment shown in the figure, a threaded hole 53 is further provided on the wire inlet section 3 for installing a setscrew to press the surface of the wire feeding section 2 to press and lock the relative angular position between the adjusted wire inlet section 3 and the wire feeding section 2.

[0042] In some embodiments, as Figures 2 to 3As shown, the first wire inlet channel 31 is a circular channel, and the wall surface of the first wire inlet channel 31 is a cylindrical surface. The mounting seat 32 is a cylindrical mounting seat 32 located in the middle of the first wire inlet channel 31. As shown in the figure, the outer surface of the cylindrical mounting seat 32 is a cylindrical surface. The cylindrical mounting seat 32 further includes a cylindrical mounting hole for mounting the second end of the connecting rod. The wire inlet section 3 further includes a connecting portion 33 connecting the wall surface of the cylindrical mounting seat 32 and the first wire inlet channel 31. The connecting portion 33 includes a first surface 331 and a second surface 332 located on opposite sides and connecting the wall surface of the cylindrical mounting seat 32 and the first wire inlet channel 31. Both the first surface 331 and the second surface 332 are tangent to the outer surface of the cylindrical mounting seat 32 and the wall surface of the first wire inlet channel 31 at the same time. Thus, a kidney-shaped hole is formed between the cylindrical mounting seat 32, the connecting portion 33 and the wall surface of the first wire inlet channel 31. In this embodiment, when the wire bundle enters the first wire inlet channel 31, it enters from the kidney-shaped hole and gradually converges around the cylindrical mounting seat 32. Since both the first surface 331 and the second surface 332 are tangent to the outer surface of the cylindrical mounting seat 32 and the wall surface of the first wire inlet channel 31 at the same time, the wire bundle can enter the first wire inlet channel more smoothly and can be converged more evenly and effectively.

[0043] In some embodiments, as Figure 4 and Figure 6 shown, the second wire inlet channel 22 is a conical channel. In this embodiment, when the wire bundle passes through the second wire inlet channel 22, it can be converged more evenly, and the convergence is more uniform, improving the convergence effect of the wire bundle.

[0044] In some embodiments, as Figure 1 and Figure 7 、 Figure 8As shown, the hollow filter rod forming device further includes a pre - gathering component 63 located upstream of the wire feeding section 3 along the moving direction of the tow 600. The pre - gathering component 630 includes more than one pre - gathering mechanism 7. The pre - gathering mechanism 7 includes a frame and a pre - gathering member connected to the frame. The frame can be set to be connected to the high - pressure nozzle or can be set without being connected to the high - pressure nozzle, with the frame set separately. The pre - gathering member includes a U - shaped member 73. The U - shaped member 73 is used to surround the tow 600 and apply pressure to the tow 600 before the tow 600 enters the first wire feeding channel 31. In the illustrated embodiment, when the tow is conveyed towards the high - pressure nozzle, it is conveyed in a flat ribbon - like form, and its cross - section is approximately a straight line. If the pre - gathering component is not provided, when the tow passes through the high - pressure nozzle, the gathering effect may not be good enough, and it may not be able to completely wrap the mandrel 360 degrees when wrapping the mandrel, and there may be an "opening" extending axially in the circumferential direction, that is, there is a situation of incomplete wrapping, and the formed filter rod product is likely to cause invisible cracks in the tube wall. By setting the pre - gathering component, before the tow enters the high - pressure nozzle, the U - shaped member 73 surrounds the tow 600 and applies pressure to the tow 600. The size of the tow 600 in the width direction will become smaller, and its width direction is surrounded and squeezed by the U - shaped member 73, so that its width - direction profile will gather towards the center of the U - shaped member. After the tow passes through pre - gathering and enters the high - pressure nozzle, the gathering effect can be improved, and it can better wrap the mandrel when passing through the mandrel.

[0045] In some embodiments, the pre - gathering component 630 further includes an intermediate component connected between the frame and the pre - gathering member. The pre - gathering member is rotatably and adjustably mounted on the intermediate component relative to the intermediate component. As shown, the pre - gathering member is rotatably adjustable relative to the intermediate component, that is, the U - shaped member 73 can adjust the angle of surrounding the tow. For example, in the embodiments shown in Figure 1 、 7 、8, one end of the U - shaped member 73 is connected to the intermediate component, for example, hinged. The U - shaped member 73 rotates relative to the intermediate component through its end, so as to adjust the included angle between it and the cross - section of the tow, thereby adjusting the pre - gathering effect on the tow. This embodiment can adjust the pre - gathering effect according to different situations of the tow, and better match the pre - gathering for tows of different types, thicknesses, etc.

[0046] In some embodiments, as shown in Figure 7 、 8 ,the intermediate component includes a first component 71 connected to the frame and a second component 72 that can slide relative to the first component 71. The pre - gathering member is rotatably and adjustably mounted on the second component 72 relative to the second component 72. By the relative sliding of the first component 71 and the second component 72, the contact of the U - shaped member 73 at different positions of the tow can be realized, and the pre - gathering process can be adjusted more.

[0047] In some embodiments, as shown in Figure 1As shown, the pre-convergence component 630 includes a plurality of pre-convergence mechanisms 7, and the plurality of pre-convergence mechanisms 7 are arranged at intervals along the moving direction of the tow 600, which can achieve step-by-step pre-convergence of the tow and improve the pre-convergence effect.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: still can modify the specific implementation manners of the present invention or perform equivalent replacements on some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A hollow filter rod forming device, characterized in that, Comprising: High-pressure nozzle, comprising: Wire outlet cylinder, comprising a cylinder cavity and an air inlet formed on its cylinder wall and communicating with the cylinder cavity; Wire inlet part, used for introducing a wire bundle and outputting the wire bundle to the cylinder cavity, comprising a wire feeding section extending into the cylinder cavity, a wire inlet section located upstream of the wire feeding section along the moving direction of the wire bundle and connected to the wire feeding section, and a connecting rod with a first end connected to a mandrel forming a hollow cavity of a filter rod and passing through the wire feeding section. The wire inlet section comprises a first wire inlet channel and a mounting seat for mounting the second end of the connecting rod. In a plane perpendicular to the moving direction of the wire bundle, the projection of the mounting seat is located in the middle of the first wire inlet channel. The wire feeding section comprises a second wire inlet channel communicating with the first wire inlet channel. The outlet of the second wire inlet channel is located in the cylinder cavity and the cross-sectional area of the outlet is smaller than the cross-sectional area of the inlet of the first wire inlet channel. The relative angle between the wire inlet section and the wire feeding section around the moving direction of the wire bundle is adjustable. The wire feeding section is hermetically connected to the surface of the cavity wall of the cylinder cavity and an annular cavity communicating with the air inlet is formed between the outer surface of the wire feeding section and the cylinder cavity. Along the moving direction of the wire bundle, the cross-sectional area of the annular cavity gradually decreases. Along the moving direction of the wire bundle, the relative position between the wire feeding section and the cylinder cavity is adjustable.

2. The hollow filter rod forming device according to claim 1, characterized in that, Further comprising a first threaded connection structure provided between the wire feeding section and the surface of the cavity wall of the cylinder cavity. The wire feeding section adjusts its relative position with the cylinder cavity along the moving direction of the wire bundle and realizes its hermetic connection with the cavity wall surface through the first threaded connection structure.

3. The hollow filter rod forming device according to claim 2, characterized in that, The outer surface of the wire feeding section comprises a conical surface, and the surface of the cavity wall of the cylinder cavity is a conical surface coaxial with the outer surface of the wire feeding section.

4. The hollow filter rod forming device according to claim 1, characterized in that, Further comprising a second threaded connection structure provided between the wire inlet section and the wire feeding section. The wire inlet section adjusts the relative angle with the wire feeding section around the moving direction of the wire bundle through the second threaded connection structure.

5. The hollow filter rod forming device according to claim 4, characterized in that, The first wire inlet channel comprises a circular channel, the mounting seat is a cylindrical mounting seat located in the middle of the first wire inlet channel, and the wire inlet section further comprises a connecting part connecting the wall surfaces of the cylindrical mounting seat and the first wire inlet channel. The connecting part comprises a first surface and a second surface located on opposite sides and connecting the outer surface of the cylindrical mounting seat and the wall surface of the circular channel. Both the first surface and the second surface are tangent to the outer surface of the cylindrical mounting seat and the wall surface of the circular channel at the same time.

6. The hollow filter rod forming device according to claim 1, wherein The second wire inlet channel is a conical channel.

7. The hollow filter rod forming device according to claim 1, characterized in that, Further comprising a pre-converging component located upstream of the wire inlet section along the moving direction of the wire bundle. The pre-converging component comprises more than one pre-converging mechanism. The pre-converging mechanism comprises a frame and a pre-converging member connected to the frame. The pre-converging member comprises a U-shaped member. The U-shaped member is used for surrounding the wire bundle before the wire bundle enters the first wire inlet channel and applying pressure to the wire bundle.

8. The hollow filter rod forming device according to claim 7, wherein, The pre-converging component further comprises an intermediate component connected between the frame and the pre-converging member. The pre-converging member is rotatably and adjustably mounted on the intermediate component relative to the intermediate component.

9. The hollow filter rod forming device according to claim 8, characterized in that, The intermediate member includes a first member connected to the frame and a second member slidable relative to the first member, and the pre-folding member is rotatably adjustable relative to the second member and is mounted on the second member.

10. The hollow filter rod forming device according to claim 7, characterized in that, The pre-folding member includes a plurality of pre-folding mechanisms, and the plurality of pre-folding mechanisms are arranged at intervals along the moving direction of the tow.

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