A shunt drum structure and a shunt drum assembly

Abstract

The present invention provides a split drum structure, which includes a drum and a baffle plate; a plurality of receiving cavities are formed on the circumferential surface of the drum, and all the receiving cavities are arranged in sequence along the circumferential direction of the drum; along the axial direction of the drum, the receiving cavity at least includes a first receiving unit and a second receiving unit arranged in sequence, and the first receiving unit and the second receiving unit are respectively used for receiving materials; ventilation holes are also formed on the drum, and each of the first receiving units and each of the second receiving units is correspondingly communicated with the ventilation holes; a first annular groove is further formed on the circumferential surface of the drum, and the first annular groove corresponds to the first receiving unit or the second receiving unit; the baffle plate is inserted into the first annular groove to block and guide the materials. At the same time, a split drum assembly is also provided. Compared with the prior art, the split drum structure and assembly can split and output materials during the process of conveying materials.

Description

Technical Field

[0001] The present invention relates to the technical field of material conveying, and particularly to a diverting drum structure and a diverting drum assembly. Background Art

[0002] In the production process of tobacco products, drums are usually used to convey materials. The circumferential surface of the drum is provided with receiving cavities for accommodating materials, and the drum is also provided with ventilation holes that communicate with the receiving cavities. When conveying materials, the drum is connected to a negative pressure device through the ventilation holes, so that negative pressure is generated at the receiving cavities. When the materials are fed into the receiving cavities, the materials are adsorbed by the negative pressure, and then the materials are conveyed by the rotation of the drum.

[0003] However, when the drums in the prior art convey materials, they all convey towards another drum or device, and the adsorption and release of the materials are achieved by turning on and off the negative pressure air path, which cannot achieve the diversion of the materials and cannot meet the diversion requirements of some devices.

[0004] Therefore, how to provide a drum structure to achieve the diversion of materials during the conveying process so as to meet the diversion requirements of the devices is an urgent problem to be solved in the art. Summary of the Invention

[0005] Aiming at the technical problem that the drums in the prior art cannot achieve the diversion of materials, the present invention provides a diverting drum structure which is provided with a baffle plate to block and guide the materials at some positions on the drum, so as to achieve the diversion of the materials.

[0006] A diverting drum structure includes a drum and a baffle plate;

[0007] A plurality of receiving cavities are formed on the circumferential surface of the drum, and all the receiving cavities are arranged in sequence along the circumference of the drum;

[0008] Along the axial direction of the drum, the receiving cavity at least includes a first receiving unit and a second receiving unit arranged in sequence, and the first receiving unit and the second receiving unit are respectively used for accommodating materials;

[0009] The drum is also provided with ventilation holes, and each first receiving unit and each second receiving unit are respectively communicated with a ventilation hole;

[0010] A first annular groove is formed on the circumferential surface of the drum, and the first annular groove corresponds to the first receiving unit or the second receiving unit;

[0011] The baffle plate is inserted into the first annular groove to block and guide the materials.

[0012] Preferably, the accommodation cavity further includes a third accommodation unit and a fourth accommodation unit for accommodating materials;

[0013] Each of the third accommodation units and each of the fourth accommodation units are correspondingly communicated with the ventilation holes;

[0014] Along the axial direction of the drum, the first accommodation unit, the second accommodation unit, the third accommodation unit, and the fourth accommodation unit are arranged in sequence;

[0015] A second annular groove is further formed on the circumferential surface of the drum, and the second annular groove corresponds to the third accommodation unit or the fourth accommodation unit;

[0016] There are two baffle plates, one is inserted into the first annular groove and the other is inserted into the second annular groove, respectively used to block and guide the materials.

[0017] Preferably, along the circumferential direction of the drum, the two baffle plates are located in the same area.

[0018] Preferably, the baffle plate and the drum are arranged at intervals.

[0019] Preferably, the drum includes a drum body and a housing member;

[0020] The housing member is arranged on the circumferential surface of the drum body;

[0021] The accommodation cavity and the first annular groove are formed on the housing member;

[0022] Along the radial direction of the drum, the ventilation holes penetrate through the drum body and the housing member.

[0023] Preferably, along the circumferential direction of the drum, the accommodation cavity includes a transition part and an accommodation part that are sequentially communicated;

[0024] The transition part is a planar structure;

[0025] The ventilation holes are formed at the accommodation part.

[0026] Preferably, the part of the baffle plate for blocking and guiding the materials is an inwardly concave arc-shaped guiding structure.

[0027] A flow-dividing drum assembly includes a flow-dividing drum structure as described in any one of the above and a gas-distributing drum;

[0028] The gas-distributing drum is arranged inside the drum and is used to externally connect a negative pressure device to provide negative pressure to the ventilation holes.

[0029] Preferably, along the rotation direction of the drum, the flow-dividing drum assembly is sequentially provided with a feeding position, a material-dividing position, and a discharging position;

[0030] The baffle is arranged at the material separation position.

[0031] Preferably, the air distribution drum is provided with air distribution grooves for communicating with the ventilation holes.

[0032] The air distribution grooves include a first air distribution groove and a second air distribution groove which are spaced from each other.

[0033] The first air distribution groove is arranged at the feeding position and the material separation position section, corresponds to the accommodating cavity, and the width of the first air distribution groove is adapted to the width of the accommodating cavity.

[0034] The second air distribution groove is arranged at the material separation position and the discharging position section, corresponds to the accommodating unit without the first annular groove, and the width of the second air distribution groove is adapted to the width of the accommodating unit without the first annular groove.

[0035] Compared with the prior art, the material distribution drum structure provided by the present invention includes a drum and a baffle; a plurality of accommodating cavities are formed on the circumferential surface of the drum, and all the accommodating cavities are arranged in sequence along the circumferential direction of the drum; along the axial direction of the drum, the accommodating cavity at least includes a first accommodating unit and a second accommodating unit which are arranged in sequence, and the first accommodating unit and the second accommodating unit are respectively used for accommodating materials; ventilation holes are also formed on the drum, and each of the first accommodating units and each of the second accommodating units is correspondingly communicated with the ventilation holes; a first annular groove is further formed on the circumferential surface of the drum, and the first annular groove corresponds to the first accommodating unit or the second accommodating unit; the baffle is inserted into the first annular groove to block and guide the material. In the material distribution drum structure, the first accommodating unit and the second accommodating unit are arranged in sequence along the axial direction in the same accommodating cavity, and the first annular groove and the baffle are provided. When the drum rotates for feeding, the baffle can block the material in one accommodating unit in the accommodating cavity, while the material in the other accommodating unit can continue to be conveyed backward, so as to realize the material distribution of the materials accommodated in the same accommodating cavity, better meet the material distribution requirements of the equipment, and improve the production efficiency. Description of the Drawings

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0037] Figure 1Schematic three-dimensional structure diagram of a shunt drum structure provided for an embodiment;

[0038] Figure 2 For Figure 1 Schematic three-dimensional structure diagram of the shown drum;

[0039] Figure 3 For Figure 1 Schematic three-dimensional structure diagram of the shown baffle plate;

[0040] Figure 4 Schematic three-dimensional structure diagram of a shunt drum assembly provided for an embodiment;

[0041] Figure 5 For Figure 4 Schematic plan structure diagram of the shown shunt drum assembly;

[0042] Figure 6 For Figure 4 Schematic three-dimensional structure diagram of the shown air distribution drum.

[0043] In the figure: 1000, shunt drum assembly; 100, shunt drum structure; 10, drum; 11, accommodation cavity; 111, first accommodation unit; 112, second accommodation unit; 113, third accommodation unit; 114, fourth accommodation unit; 115, transition part; 116, accommodation part; 12, ventilation hole; 13, first annular groove; 14, second annular groove; 15, drum body; 16, accommodating member; 20, baffle plate; 21, insertion part; 22, guiding part; 200, material; 300, air distribution drum; 310, air distribution groove; 311, first air distribution groove; 312, second air distribution groove; 400, feeding position; 500, material distribution position; 600, discharging position; 700, mounting member. Detailed implementation manners

[0044] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0045] It should be noted that when a component is referred to as being "fixed to", "mounted on" or "disposed on" another component, it can be directly on the other component or indirectly disposed on the other component; when a component is "connected" to another component, or a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component.

[0046] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0047] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" and "several" is two or more, unless otherwise specifically defined.

[0048] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the implementable conditions of the present application. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present application can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present application.

[0049] The present invention provides a shunt drum structure, which includes a drum and a baffle plate; a plurality of receiving cavities are formed on the circumferential surface of the drum, and all the receiving cavities are arranged in sequence along the circumference of the drum; along the axial direction of the drum, the receiving cavity at least includes a first receiving unit and a second receiving unit arranged in sequence, and the first receiving unit and the second receiving unit are respectively used to receive materials; ventilation holes are also formed on the drum, and each first receiving unit and each second receiving unit are correspondingly communicated with a ventilation hole; a first annular groove is also formed on the circumferential surface of the drum, and the first annular groove corresponds to the first receiving unit or the second receiving unit; the baffle plate is inserted into the first annular groove to block and guide the materials. In the shunt drum structure, the first receiving unit and the second receiving unit are arranged in sequence along the axial direction in the same receiving cavity, and a first annular groove and a baffle plate are provided. When the drum rotates for feeding, the baffle plate can block the materials in one receiving unit of the receiving cavity, while the materials in the other receiving unit can continue to be conveyed backward, so as to realize the shunt of the materials received in the same receiving cavity, better meet the shunt requirements of the equipment, and improve production efficiency.

[0050] Please refer to Figures 1 to 6。This embodiment provides a diverting drum structure 100 for conveying materials 200, where the materials 200 are tobacco materials, specifically materials required in the production process of tobacco products, such as cigarette rods, filter rods, O-rods, etc.

[0051] The diverting drum structure 100 includes a drum 10 and a baffle 20. A plurality of receiving cavities 11 are formed on the circumferential surface of the drum 10, and all the receiving cavities 11 are arranged in sequence along the circumference of the drum 10. Along the axial direction of the drum 10, the receiving cavity 11 at least includes a first receiving unit 111 and a second receiving unit 112 arranged in sequence, and the first receiving unit 111 and the second receiving unit 112 are respectively used for receiving the materials 200. That is, in the same receiving cavity 11, along the axial direction of the drum 10, at least two materials 200 can be received, specifically by the first receiving unit 111 and the second receiving unit 112 respectively.

[0052] Vent holes 12 are also formed on the drum 10, and each first receiving unit 111 and each second receiving unit 112 are correspondingly communicated with a vent hole 12. That is, a plurality of vent holes 12 are provided, and a vent hole 12 is correspondingly provided at each of the first receiving unit 111 and the second receiving unit 112. Thus, during use, the vent holes 12 can be communicated with an external negative pressure generating structure, so that negative pressure is generated at the first receiving unit 111 and the second receiving unit 112 to adsorb and transport the materials 200.

[0053] A first annular groove 13 is further formed on the circumferential surface of the drum 10, and the first annular groove 13 is correspondingly arranged for the first receiving unit 111 or the second receiving unit 112. That is, the first annular groove 13 is formed at the first receiving unit 111, or the first annular groove 13 is formed at the second receiving unit 112.

[0054] The baffle 20 is inserted into the first annular groove 13 to block and guide the materials 200. That is to say, the baffle 20 is inserted into the first annular groove 13. Thus, when the drum 10 rotates to transport the materials 200, when the materials 200 rotate to the position of the baffle 20, among the two materials 200 received in the same receiving cavity 11, one material 200 will be blocked by the baffle 20 and separated from the drum 10, while the other material 200 will continue to be driven by the drum 10 to be transported backward, so as to realize the diversion of the materials 200. For example, when the first annular groove 13 is formed at the first receiving unit 111, the baffle 20 blocks and guides the materials 200 in the first receiving unit 111, while the materials 200 in the second receiving unit 112 continue to be transported backward.

[0055] It can be understood that when the drum in the prior art transports materials, it always conveys them towards another drum or device, and finally the materials will fall into the same drum or device, unable to realize the diversion of the materials and unable to meet the diversion requirements of some devices.

[0056] The diverting drum structure 100 provided in this embodiment blocks and guides the material 200 through the baffle 20, so that different materials 200 accommodated in the same accommodation cavity 11 can be transported to different places, realizing the diversion of the material 200, better meeting the diversion requirements of the equipment, and improving production efficiency.

[0057] Preferably, in one embodiment, the accommodation cavity 11 further includes a third accommodation unit 113 and a fourth accommodation unit 114 for accommodating the material 200. Each third accommodation unit 113 and each fourth accommodation unit 114 are correspondingly communicated with a ventilation hole 12. That is, a ventilation hole 12 is correspondingly provided at each third accommodation unit 113 and each fourth accommodation unit 114. Along the axial direction of the drum 10, the first accommodation unit 111, the second accommodation unit 112, the third accommodation unit 113, and the fourth accommodation unit 114 are arranged in sequence. A second annular groove 14 is also formed on the circumferential surface of the drum 10, and the second annular groove 14 corresponds to the third accommodation unit 113 or the fourth accommodation unit 114. There are two baffle plates 20. One baffle plate 20 is inserted into the first annular groove 13, and the other baffle plate 20 is inserted into the second annular groove 14. The two baffle plates 20 are respectively used to block and guide the material 200. That is to say, in this embodiment, in one accommodation cavity 11, four materials 200 can be accommodated along the axial direction at the same time, two of the materials 200 will be blocked by the baffle plate 20, and two of the materials 200 will not be blocked by the baffle plate 20.

[0058] Specifically, in one embodiment, annular grooves can be formed at the first accommodation unit 111, the second accommodation unit 112, the third accommodation unit 113, and the fourth accommodation unit 114. Thus, according to actual needs, by inserting the baffle plate 20 at different annular grooves, different diversion purposes can be achieved.

[0059] Preferably, in one embodiment, along the circumferential direction of the drum 10, the two baffle plates 20 are located in the same area. That is, the two baffle plates 20 block the material 200 in the same position area, so as to realize the pairwise diversion of the four materials 200 in the same accommodation cavity 11.

[0060] Preferably, in one embodiment, the baffle plate 20 and the drum 10 are arranged at intervals. Thus, when the drum 10 rotates, the baffle plate 20 will not interfere with the normal operation of the drum 10, and at the same time, it also better avoids abrasion between the baffle plate 20 and the drum 10.

[0061] Preferably, in one embodiment, the drum 10 includes a drum body 15 and a receiving member 16. The receiving member 16 is disposed on the circumferential surface of the drum body 15. The receiving cavity 11 and the first annular groove 13 are formed on the receiving member 16. Along the radial direction of the drum 10, the ventilation hole 12 penetrates through the drum body 15 and the receiving member 16. With this structure, the processing difficulty of the drum 10 can be reduced.

[0062] Specifically, in one embodiment, the second annular groove 14 is also formed on the receiving member 16.

[0063] Preferably, in one embodiment, along the circumferential direction of the drum 10, the receiving cavity 11 includes a transition portion 115 and a receiving portion 116 that are sequentially communicated. The transition portion 115 is a planar structure, and the ventilation hole 12 is formed at the receiving portion 116. Through the transition portion 115, the material 200 can be better received, making the feeding and discharging of the drum 10 more stable and smooth.

[0064] Preferably, in one embodiment, the part of the baffle 20 for blocking and guiding the material 200 is an inwardly concave arc-shaped guiding structure. That is, the incoming material side of the baffle 20 is an inwardly concave arc-shaped structure, so that the material 200 can be better guided.

[0065] Specifically, in one embodiment, the baffle 20 includes an insertion portion 21 and a guiding portion 22. The insertion portion 21 is inserted into the first annular groove 13 (or the second annular groove 14), and the guiding portion 22 is disposed on the incoming material side of the baffle 20. The guiding portion 22 is an inwardly concave arc-shaped structure. Thus, when blocking the material 200, the material 200 can better roll along the guiding portion 22, better realizing the guiding of the material 200. Specifically, the insertion portion 21 is an arc-shaped structure, and the radian of the insertion portion 21 is adapted to the radian of the drum 10.

[0066] Meanwhile, in one embodiment, a diverting drum assembly 1000 is also provided, which includes a diverting drum structure 100 as described in any of the above embodiments and an air distribution drum 300. The air distribution drum 300 is disposed inside the drum 10, and the air distribution drum 300 is used to connect to a negative pressure device to provide negative pressure to the ventilation hole 12. When the diverting drum assembly 1000 is installed on a conveying device, the drum 10 is connected to a driving mechanism on the conveying device, so that the drum 10 can be driven to rotate by the power provided by the driving mechanism, while the air distribution drum 300 can be fixed relative to the frame wall panel on the conveying device.

[0067] Preferably, in one embodiment, along the rotation direction of the drum 10, the diverting drum assembly 1000 is sequentially provided with a feeding position 400, a material distributing position 500, and a discharging position 600. The baffle 20 is disposed at the material distributing position 500.

[0068] In one embodiment, when the receiving cavity 11 on the drum 10 rotates to the feeding position 400, the first receiving unit 111, the second receiving unit 112, the third receiving unit 113, and the fourth receiving unit 114 in the receiving cavity 11 correspondingly pick up four materials 200; when the drum 10 continues to rotate to the material distribution position 500, the two baffle plates 20 block two materials 200, so that the two materials 200 are separated from the drum 10 at the material distribution position 500; when the drum 10 continues to rotate to the discharging position 600, the other two materials 200 are separated from the drum 10.

[0069] Preferably, in one embodiment, an air distribution groove 310 for communicating with the ventilation hole 12 is formed on the air distribution drum 300. The air distribution groove 310 includes a first air distribution groove 311 and a second air distribution groove 312 that are spaced apart from each other. The first air distribution groove 311 is arranged in the section of the feeding position 400 and the material distribution position 500, and corresponds to the receiving cavity 11. Moreover, the width of the first air distribution groove 311 (the dimension extending along the axial direction of the air distribution drum 300) is adapted to the width of the receiving cavity 11 (the dimension extending along the axial direction of the drum 10). Thus, when the receiving cavity 11 rotates to the feeding position 400 and the material distribution position 500, it can be connected to the negative pressure device through the first air distribution groove 311, so as to generate negative pressure to adsorb the material 200. The second air distribution groove 312 is arranged in the section of the material distribution position 500 and the discharging position 600, and corresponds to the receiving unit without the first ring groove 13. For example, when the first ring groove 13 is formed at the first receiving unit 111, the second air distribution groove 312 corresponds to the second receiving unit 112. The width of the second air distribution groove 312 is adapted to the width of the receiving unit without the first ring groove. Thus, after the material distribution is carried out when the receiving cavity 11 rotates to the material distribution position 500, the receiving unit in the receiving cavity 11 that retains the material 200 can be connected to the negative pressure device through the second air distribution groove 312; until the receiving cavity 11 rotates to the discharging position 600, the air path is blocked, and the remaining material 200 in the receiving cavity 11 is separated from the drum 10.

[0070] Specifically, in one embodiment, there are two second air distribution grooves 312, and the two second air distribution grooves 312 are arranged corresponding to the receiving units without the first ring groove 13 and the second ring groove 14.

[0071] Specifically, in one embodiment, the shunt drum assembly 1000 further includes a mounting member 700, and the baffle plate 20 can be fixed to the frame wall plate on the conveying device through the mounting member 700.

[0072] The above are only the embodiments of the present invention. It should be noted here that for those of ordinary skill in the art, without departing from the inventive concept of the present invention, improvements can still be made, but these all belong to the protection scope of the present invention.

Claims

1. A diverter drum structure used in the production process of tobacco products, characterized in that, It includes a drum (10) and a baffle plate (20); A plurality of receiving cavities (11) are formed on the circumferential surface of the drum (10), and all the receiving cavities (11) are arranged in sequence along the circumference of the drum (10); Along the axial direction of the drum (10), the receiving cavity (11) at least includes a first receiving unit (111) and a second receiving unit (112) arranged in sequence, and the first receiving unit (111) and the second receiving unit (112) are respectively used for receiving materials (200); Vent holes (12) are also formed on the drum (10), and each first receiving unit (111) and each second receiving unit (112) are correspondingly communicated with the vent holes (12); A first annular groove (13) is further formed on the circumferential surface of the drum (10), and the first annular groove (13) is arranged corresponding to the first receiving unit (111) or the second receiving unit (112); The baffle plate (20) is inserted into the first annular groove (13) to block and guide the material (200); The receiving cavity (11) further includes a third receiving unit (113) and a fourth receiving unit (114) for receiving materials (200); Each third receiving unit (113) and each fourth receiving unit (114) are correspondingly communicated with the vent holes (12); Along the axial direction of the drum (10), the first receiving unit (111), the second receiving unit (112), the third receiving unit (113), and the fourth receiving unit (114) are arranged in sequence; A second annular groove (14) is further formed on the circumferential surface of the drum (10), and the second annular groove (14) is arranged corresponding to the third receiving unit (113) or the fourth receiving unit (114); There are two baffle plates (20), one is inserted into the first annular groove (13), and the other is inserted into the second annular groove (14), respectively used for blocking and guiding the material (200); Along the circumference of the drum (10), the two baffle plates (20) are located in the same area; The baffle plate (20) and the drum (10) are arranged at intervals; The part of the baffle plate (20) for blocking and guiding the material (200) is an inwardly concave arc-shaped guiding structure.

2. The shunt drum structure according to claim 1, wherein, The drum (10) includes a drum body (15) and a receiving member (16); The receiving member (16) is arranged on the circumferential surface of the drum body (15); The receiving cavity (11) and the first annular groove (13) are formed on the receiving member (16); Along the radial direction of the drum (10), the vent holes (12) penetrate through the drum body (15) and the receiving member (16).

3. The diverter drum structure according to claim 2, wherein Along the circumference of the drum (10), the receiving cavity (11) includes a transition part (115) and a receiving part (116) that are communicated in sequence; The transition part (115) is a planar structure; The vent holes (12) are formed at the receiving part (116).

4. A diverter drum assembly used in the production process of a tobacco product, characterized in that, It includes a flow dividing drum structure as described in any one of claims 1 to 3 and a gas distribution drum (300); The air distribution drum (300) is arranged inside the drum (10) and is used to connect to a negative pressure device to provide negative pressure at the ventilation holes (12).

5. The diverter drum assembly according to claim 4, wherein Along the rotation direction of the drum (10), the shunt drum assembly is successively provided with a feeding position (400), a material distribution position (500), and a discharging position (600). The baffle plate (20) is arranged at the material distribution position (500).

6. The diverter drum assembly according to claim 5, wherein, The air distribution drum (300) is provided with an air distribution groove (310) for communicating with the ventilation holes (12). The air distribution groove (310) includes a first air distribution groove (311) and a second air distribution groove (312) which are spaced from each other. The first air distribution groove (311) is arranged at the section of the feeding position (400) and the material distribution position (500), corresponds to the accommodation cavity (11), and the width of the first air distribution groove (311) is adapted to the width of the accommodation cavity (11). The second air distribution groove (312) is arranged at the section of the material distribution position (500) and the discharging position (600), corresponds to the accommodation unit where the first ring groove (13) and the second ring groove (14) are not arranged, and the width of the second air distribution groove (312) is adapted to the width of the accommodation unit where the first ring groove (13) and the second ring groove (14) are not arranged.

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