A gas distribution mechanism

Abstract

The present application belongs to the technical field of paper drawing processing equipment, and in particular relates to a gas distribution mechanism. The gas distribution mechanism is connected with a paper folding roller, and a plurality of air suction holes are uniformly arranged on the surface of the paper folding roller in the circumferential direction. A plurality of air passages are uniformly distributed in the circumferential direction in the paper folding roller, and each air passage is in communication with its corresponding air suction hole. The minimum circle tangent to each air passage is a tangent circle. The gas distribution mechanism comprises: a gas cutting valve coaxially fixed at the axial end of the paper folding roller, the minimum outer diameter of the gas cutting valve being greater than the diameter of the tangent circle, a plurality of gas guide passages being arranged in the gas cutting valve and connected with each air passage; and a gas distribution ring coaxially rotatably sealed on the gas cutting valve, a gas valve being arranged on the gas distribution ring. In the process of relative rotation between the gas distribution ring and the gas cutting valve, the gas valve is in communication with different gas guide passages in sequence. The present application can reduce the vibration of the paper folding roller during operation, thereby improving the quality of the drawn paper.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of paper processing equipment, and particularly relates to a gas distribution mechanism for controlling airflow in a paper folding roller. BACKGROUND

[0002] With the improvement of living standards, people's demand for types of paper for daily use is increasingly subdivided. Commonly used types of paper include toilet paper, kitchen paper, and facial tissue paper, etc. Different types of paper have different materials and are used in different situations. During the processing of facial tissue paper, a paper processing equipment uses a paper folding roller to overlap multiple layers of paper towels with each other, thereby forming a paper roll.

[0003] In the prior art, a plurality of air suction holes are distributed on the surface of the paper folding roller. During the rotation of the paper folding roller, the paper towels are adsorbed on the surface of the paper folding roller by air pressure through the air suction holes, and the paper folding roller stops adsorbing the paper towels after the paper towels are delivered to the designed position. In order to achieve this effect, a gas distribution mechanism is currently used to control the airflow of different air suction holes on the paper folding roller.

[0004] Generally, a plurality of air passages connected with the air suction holes are uniformly arranged in the circumferential direction inside the paper folding roller. These air passages penetrate the paper folding roller in the axial direction. The gas distribution mechanism is rotationally connected with the paper folding roller. During the relative rotation of the two, the gas distribution mechanism continuously switches the connection of each air passage, thereby achieving the control of the airflow of different air suction holes on the paper folding roller.

[0005] In order to enable the two ends of the paper folding roller to be connected with the rack or other fixed frame of the paper processing equipment, a shaft is arranged at the two ends of the paper folding roller, and then the shaft is connected with the rack of the paper processing equipment through bearings or other connection methods. However, under the influence of the plurality of air passages in the paper folding roller, the diameter of the shaft cannot be too large, so as to avoid the shaft blocking the air passages. According to the actual working conditions, the small-diameter shaft is prone to vibration during the high-speed operation of the paper folding roller, thereby causing the vibration of the entire paper processing equipment, affecting the performance of the paper processing equipment, reducing the flatness of the paper during the processing, and even causing the paper to be damaged during the processing. SUMMARY

[0006] In view of the above technical problems, the present application aims to provide a gas distribution mechanism which can reduce the vibration of the paper folding roller during operation and thereby improve the quality of the paper.

[0007] According to the present application, a gas distribution mechanism is provided, which is connected with a paper folding roller. A plurality of air suction holes are uniformly arranged in the circumferential direction on the surface of the paper folding roller. A plurality of air passages arranged in the axial direction are uniformly distributed in the circumferential direction inside the paper folding roller. Each air passage is in communication with its corresponding air suction hole. The smallest circle tangent to each air passage is a tangent circle. The gas distribution mechanism comprises:

[0008] A cutting air valve is coaxially fixed at the axial end of the folding roller, the minimum outer diameter of the cutting air valve is greater than the diameter of the cutting circle, and a plurality of air guide channels are arranged in the cutting air valve and connected with the respective air passages;

[0009] A gas distribution ring is coaxially rotatably arranged on the cutting air valve, a valve is arranged on the gas distribution ring, and the valve is sequentially communicated with different air guide channels during the relative rotation of the gas distribution ring and the cutting air valve.

[0010] In a preferred embodiment provided by the present application, the distance between the outlet of the air guide channel away from the folding roller and the center axis of the folding roller is greater than the distance between the air passage and the center axis of the folding roller.

[0011] In a preferred embodiment provided by the present application, the cutting air valve comprises a connecting section and a gas distribution section, the diameter of the connecting section is greater than the diameter of the gas distribution section, one end of the connecting section is coaxially and sealingly fixed with the end face of the folding roller, the other end of the connecting section is coaxially fixed with the gas distribution section, and the gas distribution ring is coaxially and sealingly arranged on the gas distribution section.

[0012] In a preferred embodiment provided by the present application, one end of the air guide channel is connected with the corresponding air passage, and the other end of the air guide channel extends to the radial outer wall of the gas distribution section.

[0013] In a preferred embodiment provided by the present application, one end of the air guide channel is connected with the corresponding air passage, and the other end of the air guide channel extends to the end face of the connecting section away from the air passage.

[0014] In a preferred embodiment provided by the present application, an arc-shaped channel and an air passage are arranged on the gas distribution ring, and the arc-shaped channel connects the air passage with the valve.

[0015] In a preferred embodiment provided by the present application, the valve is arranged on the inner ring wall of the gas distribution ring.

[0016] In a preferred embodiment provided by the present application, the valve is arranged on the side wall of the gas distribution ring.

[0017] In a preferred embodiment provided by the present application,

[0018] The valve comprises a first valve arranged on the inner ring wall of the gas distribution ring and a second valve arranged on the side wall of the gas distribution ring facing the connecting section,

[0019] The air passage comprises first air passages and second air passages arranged alternately,

[0020] The air guide comprises first air guides and second air guides arranged alternately,

[0021] One end of the first air guide is connected with the corresponding first air passage, and the other end of the first air guide extends to the radial side surface of the air distribution section,

[0022] One end of the second air guide is connected with the corresponding second air passage, and the other end of the second air guide extends to the end surface of the connecting section away from the folding roller.

[0023] In a preferred embodiment according to the present application, a first sealing member is arranged between the air distribution ring and the air distribution section, and a second sealing member is arranged between the air distribution ring and the connecting section.

[0024] Compared with the prior art, the present application has at least the following advantages.

[0025] The present application is provided with a gas cutting valve at the end of the folding roller, one end of the air guide in the gas cutting valve is communicated with the air passage in the folding roller, the other end of the air guide is offset along the radial outer side, and the air distribution ring is coaxially arranged on the gas cutting valve, and the air distribution ring can switch different air guides during rotation relative to the gas cutting valve.

[0026] In this arrangement, the gas cutting valve can replace the rotating shaft at the end of the folding roller in the prior art, and the diameter of the gas cutting valve is no longer limited by the position of the air passage, that is, the diameter of the gas cutting valve can be as large as possible, thereby reducing the vibration of the folding roller during high-speed operation. On the one hand, the operating speed of the folding roller can be improved, thereby increasing the production speed of the paper; on the other hand, the vibration of the paper processing equipment is reduced, thereby improving the production quality of the paper. BRIEF DESCRIPTION OF DRAWINGS

[0027] The present application will be described below with reference to the accompanying drawings.

[0028] Figure 1 Fig. 1 shows a schematic view of an embodiment of the air distribution mechanism connected with the folding roller according to the present application;

[0029] Figure 2 Fig. 2 shows a schematic view of the end surface of the folding roller according to the present application; Figure 1 Fig. 3 shows an enlarged schematic view of part A in Fig. 2;

[0030] Figure 3 Fig. 4 shows a schematic view of the end surface of the gas cutting valve according to the present application;

[0031] Figure 4 Fig. 5 shows a schematic view of the end surface of the gas cutting valve according to the present application;

[0032] Figure 5 A cross-sectional view of the air cutting valve according to the present application is shown.

[0033] Figure 6 A cross-sectional view of the air cutting valve according to the present application is shown. Figure 2 A cross-sectional view of the air cutting valve according to the present application is shown.

[0034] In the figure: 1, paper folding roller; 10, air passage; 11, first air passage; 12, second air passage; 13, air inlet hole;

[0035] 2, air cutting valve; 20, air guide passage; 21, connecting section; 22, air distribution section; 23, first air guide passage; 24, second air guide passage;

[0036] 3, air distribution ring; 30, air valve; 31, first air valve; 32, second air valve; 33, arc-shaped passage; 34, air passage pipe;

[0037] 41, first sealing member; 42, second sealing member;

[0038] 90, cutting circle;

[0039] 100, air distribution mechanism.

[0040] In this application, all the drawings are schematic drawings, only for illustrating the principles of the present application, and are not drawn in actual proportion. DETAILED DESCRIPTION

[0041] The present application will be described below with reference to the drawings.

[0042] It should be noted that the directional phrases or limiting words "up", "down", "left", "right", etc. used in this application are all relative to the Figure 1 directions of the air distribution mechanism 100. Among them, "axial direction" refers to the direction of the rotation axis of the paper folding roller 1 of the air distribution mechanism 100; "radial direction" refers to the direction of the diameter of the paper folding roller 1 of the air distribution mechanism 100. They are not used to limit the absolute position of the involved parts, but can be changed according to the specific situation.

[0043] Figure 1 The structure of the air distribution mechanism 100 according to the present application is shown, as Figure 1 shown, the air distribution mechanism 100 is connected with the paper folding roller 1.

[0044] The paper folding roller 1 is a circular column structure, a plurality of cutters and grooves are alternately arranged on the outer surface of the paper folding roller 1 in the circumferential direction, for folding and cutting paper towels, these structures of the paper folding roller 1 are all prior art, not the technical points of the present application, and will not be described here.

[0045] A plurality of air suction holes 13 are evenly arranged on the surface of the folding roller 1 in the circumferential direction, and a plurality of air passages 10 are evenly distributed in the axial direction on the folding roller 1, each air passage 10 is communicated with the corresponding air suction hole 13. When negative pressure is generated in any air passage 10, the air suction hole 13 communicated with the air passage 10 can adsorb the paper towel, so that the folding roller 1 can fold, cut and perform other operations on the paper towel.

[0046] The air distribution mechanism 100 can continuously switch the air passages 10 during the rotation of the folding roller 1, so that the corresponding air suction holes 13 on the folding roller 1 generate negative pressure and adsorb the paper towel.

[0047] In this embodiment, the smallest circle tangent to each air passage 10 is defined as the tangent circle 90, as shown in Figure 2 .

[0048] As shown in Figure 1 , the air distribution mechanism includes a cutting valve 2 and a gas distribution ring 3.

[0049] Specifically, as shown in Figure 1 , Figure 5 and Figure 6 , the cutting valve 2 is coaxially fixedly arranged at the axial end of the folding roller 1. The minimum outer diameter of the cutting valve 2 is greater than the diameter of the tangent circle 90, and a plurality of air guide passages 20 are arranged in the cutting valve 2 and connected with each air passage 10, that is, the air guide passages 20 correspond to the air passages 10 one by one.

[0050] In actual work process, the end of the cutting valve 2 away from the folding roller 1 is rotatably arranged on the rack (not shown in the figure) of the paper extraction processing equipment through bearing or other connection mode, and the cutting valve 2 is drivingly connected with the driver (not shown in the figure), and the driver can drive the cutting valve 2 to rotate after starting, and then drive the folding roller 1 to rotate.

[0051] As shown in Figure 1 and Figure 3 , the gas distribution ring 3 is coaxially and rotatably sealed on the cutting valve 2, and the gas distribution ring 3 is provided with a gas door 30. The gas distribution ring 3 is fixedly connected with the rack (not shown in the figure) of the paper extraction processing equipment or other fixed parts.

[0052] After the driver starts, the cutting valve 2 and the folding roller 1 are driven to rotate, and since the gas distribution ring 3 is fixed, the gas distribution ring 3 and the cutting valve 2 will relatively rotate, and in the process of relative rotation, the gas door 30 is communicated with different air guide passages 20 one by one. It is easy to understand that the gas door 30 of the gas distribution ring 3 can be connected with the air pump or other air suction equipment, and in the process of relative rotation of the gas distribution ring 3 with respect to the cutting valve 2, the air pump or other air suction equipment can be communicated with different air guide passages 20 through the gas door 30, so that the air suction hole 13 communicated with the air guide passage 20 can adsorb the paper towel on the surface of the folding roller 1.

[0053] In the present embodiment, the air cutting valve 2 is arranged at the end of the folding roller 1 instead of the rotating shaft (not shown in the figure) arranged coaxially in the prior art. In the prior art, in order to prevent the rotating shaft from blocking the air passage 10, the diameter of the rotating shaft cannot be greater than Figure 2 the tangent circle 90 in the figure. The structure of the air cutting valve 2 of the present application enables the outer diameter of the air cutting valve 2 to be not affected by the air passage 10, so the outer diameter of the air cutting valve 2 can be greater than Figure 2 the tangent circle 90 in the figure, thereby solving the problem of large vibration of the folding roller 1 in high-speed operation caused by the too thin rotating shaft in the prior art.

[0054] According to the present application, the folding roller 1 and the air cutting valve 2 can adopt an integrated structure or a split structure. In a preferred embodiment, the folding roller 1 and the air cutting valve 2 are detachable, for example, the folding roller 1 and the air cutting valve 2 can be connected by a plurality of bolts. The advantage of the split structure is that when the folding roller 1 needs to be replaced, the folding roller 1 can be directly detached without detaching the air cutting valve 2. The difficulty of detaching the folding roller 1 alone is greatly reduced compared to detaching the folding roller 1 and the air cutting valve 2 as a whole, thereby improving the efficiency of detaching the folding roller 1.

[0055] According to the present application, the distance between the outlet of the air guide passage 20 away from the folding roller 1 and the center axis of the folding roller 1 is greater than the distance between the air passage 10 and the center axis of the folding roller 1. That is, the end of the air guide passage 20 away from the folding roller 1 is offset to the radial outside. As Figure 5 shown in the figure, the air guide passage 20 can be inclined radially outward in the air cutting valve 2, so that the end of the air guide passage 20 away from the folding roller 1 is offset radially outward; the air guide passage 20 can also be opened on the radial side wall of the air cutting valve 2 away from the folding roller 1, so that the end of the air guide passage 20 away from the folding roller 1 is offset radially outward.

[0056] In a specific embodiment, as Figure 5 shown in the figure, the air cutting valve 2 comprises a connecting section 21 and a gas distribution section 22, the diameter of the connecting section 21 is greater than the diameter of the gas distribution section 22. As Figure 1 and Figure 2 shown in the figure, the diameter of the connecting section 21 is equal to the diameter of the folding roller 1, one end of the connecting section 21 is coaxially and sealingly fixed to the end face of the folding roller 1, the other end of the connecting section 21 is coaxially fixed to the gas distribution section 22, and the gas distribution ring 3 is coaxially and sealingly sleeved on the gas distribution section 22.

[0057] One end of the air guide passage 20 is connected to the corresponding air passage 10, and the other end of the air guide passage 20 extends to the radial outer wall of the gas distribution section 22. In addition, the air guide passage 20 can also be arranged such that one end is connected to the corresponding air passage 10 and the other end extends to the end face of the connecting section 21 away from the air passage 10.

[0058] According to the present invention, an arc-shaped channel 33 and a vent pipe 34 are further provided on the valve ring 3, the arc-shaped channel 33 connecting the vent pipe 34 to the valve 30. The vent pipe 34 is used to connect to an air pump or other suction equipment.

[0059] According to a specific embodiment of the present invention, three cutters and three grooves are alternately arranged along the circumferential direction on the outer wall of the folding roller 1, and an air suction hole 13 is provided next to each cutter and groove.

[0060] Correspondingly, such as Figure 3 As shown, six ventilation channels 10 are provided inside the folding roller 1. These six ventilation channels 10 are divided into three first ventilation channels 11 and three second ventilation channels 12 arranged alternately along the circumference. Among them, the three first ventilation channels 11 are connected to the air suction holes 13 next to the three cutters, and the three second ventilation channels 12 are connected to the air suction holes 13 next to the three grooves. All six ventilation channels 10 are arranged axially through the folding roller 1, and a cutting valve 2 is coaxially fixed at both ends of the folding roller 1.

[0061] Accordingly, such as Figure 4 As shown, six air guide channels 20 are provided inside the air-cutting valve 2. These six air guide channels 20 are three first air guide channels 23 and three second air guide channels 24 arranged alternately along the circumference. Among them, the three first air guide channels 23 are connected to the three first air passages 11, and the three second air guide channels 24 are connected to the three second air passages 12.

[0062] It should be noted that the structure of the folding roller 1 given in this embodiment is only used to illustrate the working principle of the air-cutting valve 2 of the present invention. The specific mechanism of the folding roller 1 is prior art and is not a key technical point of the present invention. Meanwhile, the number of air guide channels 20 in the present invention is only to correspond to the air passage 10 of the folding roller 1 proposed in this embodiment. If a folding roller 1 with other structures is required, those skilled in the art can modify the number of air guide channels 20 according to the actual situation and in conjunction with the content of the present invention. Such changes should be within the protection scope of the present invention.

[0063] In this embodiment, the structures of the first air guide 23 and the second air guide 24 are different, so as to... Figure 2 The air cut-off valve 2 shown Figure 1 Taking the air-cutting valve 2 located at the right end of the folding roller 1 as an example, the explanation will be carried out. Figure 5 for Figure 2 A cross-sectional schematic diagram of the gas-cutting valve 2 in the diagram.

[0064] like Figure 5As shown, the left end of the first air guide duct 23 is connected to the first air passage 11, and the right end of the first air guide duct 23 extends axially toward the air distribution section 22. After the first air guide duct 23 extends to the air distribution section 22, it changes its extension direction and continues to extend radially until it reaches the radial side wall of the air distribution section 22.

[0065] The left end of the second air guide duct 24 connects to the second air passage 12, and the right end of the second air guide duct 24 extends radially outward at an angle until it reaches the right end face of the connecting section 21. It is easy to understand that the right end face of the connecting section 21 refers to the end face of the connecting section 21 that is larger than the outer diameter of the air distribution section 22.

[0066] like Figure 6 As shown, the valve train 3 has a hollow structure, and the cavity inside the valve train 3 is the arc-shaped channel 33. A vent pipe 34 is provided on the radial outer wall of the valve train 3, and the vent pipe 34 is connected to the arc-shaped channel 33.

[0067] It should be noted that the shape of the arc-shaped channel 33 is not limited to an arc shape, as long as it can connect the vent pipe 34 and the valve 30.

[0068] Two valves 30 are provided on the valve ring 3. These two valves 30 are the first valve 31 and the second valve 32, respectively. The first valve 31 is used to connect the first air guide 23 with the arc-shaped channel 33, and the second valve 32 is used to connect the second air guide 24 with the arc-shaped channel 33.

[0069] Specifically, the first valve 31 is disposed on the radial inner wall of the valve distribution ring 3. After the valve distribution ring 3 is fitted onto the valve distribution section 22, the radial inner ring of the valve distribution ring 3 slides in contact with the radial outer surface of the valve distribution section 22, thereby enabling the first valve 31 to communicate with the first air guide passage 23 on the valve distribution section 22.

[0070] The second valve 32 is disposed on the end face wall of the valve ring 3 near the connecting section 21. After the valve ring 3 is fitted onto the valve section 22, the end face wall of the valve ring 3 slides in contact with the end face of the connecting section 21, thereby enabling the second valve 32 to communicate with the second air guide 24 on the connecting section 21.

[0071] During the rotation of the cut-off valve 2 relative to the valve ring 3, the first valve 31 and the second valve 32 can simultaneously connect adjacent first air guide passages 23 and second air guide passages 24 to the arc-shaped channel 33, respectively. In this embodiment, the three first air guide passages 23 and the three second air guide passages 24 are alternately and evenly arranged along the circumferential direction, and the phase angle between adjacent first air guide passages 23 and second air guide passages 24 is 60 degrees, so the phase angle between the first valve 31 and the second valve 32 is 60 degrees.

[0072] According to the present invention, the valve ring 3 can be configured as a circular ring or an arc shape, i.e., as shown below.Figure 6 As shown, the air distribution ring 3 only surrounds part of the circumference of the air cutting valve 2. When the air distribution ring 3 is arranged in an arc shape, the arc of the air distribution ring 3 needs to be at least capable of arranging the first air valve 31 and the second air valve 32, and ensuring the phase angle requirements of the first air valve 31 and the second air valve 32.

[0073] In a preferred embodiment, a first sealing member 41 is arranged between the air distribution ring 3 and the air distribution section 22, as shown in Figure 6 A second sealing member 42 is arranged between the air distribution ring 3 and the connecting section 21, as shown in Figure 1 and Figure 2 .

[0074] In the present embodiment, as shown in Figure 6 , the air distribution ring 3 is an arc-shaped ring as a whole, and one air pipe 34 is arranged at each end of the arc of the air distribution ring 3.

[0075] Further, in a preferred embodiment, the first air valve 31 and the second air valve 32 can be separated by a partition plate or the like in the arc-shaped channel 33, and one air pipe 34 is in communication with the arc-shaped channel 33 in which the first air valve 31 is arranged, and the other air pipe 34 is in communication with the arc-shaped channel 33 in which the second air valve 32 is arranged. The two air pipes 34 are respectively connected to different air pumps or air suction devices, so that the pressure in the two air pipes 34 can be controlled respectively, and the suction strength of the air suction holes 13 beside the knife and the groove can be controlled respectively, so as to achieve more fine control of the paper towel adsorbed on the paper towel roller 1.

[0076] In the description of the present application, it should be understood that the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0077] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0078] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0079] Finally, it should be noted that the above only describes the preferred embodiments of the present application and does not constitute any limitation on the present application. Although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A gas distribution mechanism connected with a folding roller (1), a plurality of air suction holes (13) being evenly arranged on the surface of the folding roller (1) in the circumferential direction, a plurality of air passages (10) being evenly distributed in the circumferential direction in the folding roller (1), each of the air passages (10) being in communication with the corresponding air suction hole (13), and the minimum circle tangent to each of the air passages (10) being a tangent circle (90), the gas distribution mechanism comprising: a tangent air valve (2) coaxially fixed at the axial end of the folding roller (1), the minimum outer diameter of the tangent air valve (2) being greater than the diameter of the tangent circle (90), a plurality of air guide passages (20) being arranged in the tangent air valve (2) and connected with each of the air passages (10), the distance from the outlet of the air guide passage (20) away from the folding roller (1) to the central axis of the folding roller (1) being greater than the distance from the air passage (10) to the central axis of the folding roller (1), the tangent air valve (2) comprising a connecting section (21) and a gas distribution section (22), the diameter of the connecting section (21) being greater than the diameter of the gas distribution section (22), one end of the connecting section (21) being coaxially and sealingly fixed with the end face of the folding roller (1), and the other end of the connecting section (21) being coaxially fixed with the gas distribution section (22); and a gas distribution ring (3) coaxially and rotatably sealingly arranged on the tangent air valve (2), the gas distribution ring (3) being coaxially and sealingly sleeved on the gas distribution section (22), an air valve (30), an arc-shaped passage (33) and an air passage (34) being arranged on the gas distribution ring (3), the arc-shaped passage (33) connecting the air passage (34) with the air valve (30), and the air valve (30) being in communication with different air guide passages (20) in turn during the relative rotation of the gas distribution ring (3) and the tangent air valve (2), the air valve (30) comprising a first air valve (31) and a second air valve (32), the first air valve (31) being arranged on the inner ring wall of the gas distribution ring (3), and the second air valve (32) being arranged on the side wall of the gas distribution ring (3) facing the connecting section (21), the air passage (10) comprising alternately arranged first air passages (11) and second air passages (12), the air guide passage (20) comprising alternately arranged first air guide passages (23) and second air guide passages (24), one end of the first air guide passage (23) being connected with the corresponding first air passage (11), the other end of the first air guide passage (23) extending to the radial side face of the gas distribution section (22), one end of the second air guide passage (24) being connected with the corresponding second air passage (12), and the other end of the second air guide passage (24) extending to the end face of the connecting section (21) away from the folding roller (1), one end of the air guide passage (20) being connected with the corresponding air passage (10), and the other end of the air guide passage (20) extending to the radial outer wall of the gas distribution section (22). ​ ​ ​ ​ ​ ​ ​ 2. The gas distribution mechanism of claim 1, wherein, ​ 3. The gas distribution mechanism of claim 1, wherein, One end of the air guide passage (20) is connected with the corresponding air passage (10), and the other end of the air guide passage (20) extends to the end face of the connecting section (21) away from the air passage (10).

4. The gas distribution mechanism of claim 1, wherein, The air valve (30) is arranged on the inner ring wall of the valve distribution ring (3).

5. The gas distribution mechanism of claim 1, wherein, The air valve (30) is arranged on the side wall of the valve distribution ring (3).

6. The gas distribution mechanism of claim 1, wherein, A first sealing member (41) is arranged between the valve distribution ring (3) and the valve distribution section (22), and a second sealing member (42) is arranged between the valve distribution ring (3) and the connecting section (21).

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