Normally closed conduction device, air exhaust assembly and tobacco shred box

Abstract

The utility model discloses a normally closed breakover device, air exhaust subassembly and tobacco shred box, normally closed breakover device includes bottom plate, telescopic post, outer sleeve, drive piece, elastic piece, inner sleeve and traversing block, by driving telescopic post to retract, can make the air outlet through hole of inner sleeve side be communicated with tobacco shred box interior, at this time is convenient to realize the air exhaust of tobacco shred box interior. According to the cut tobacco box, conduction is conveniently achieved when air in the cut tobacco box is extracted, so that part of air in the cut tobacco box is extracted, the cut tobacco box can be isolated from the outside through the conduction device, the problem of condensation of the inner wall of the cut tobacco box can be greatly solved, the interior of the cut tobacco box is kept dry, and the quality of cut tobacco in the cut tobacco box is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tobacco storage device technical field especially relates to a normally closed conduction device, exhaust component and tobacco box. BACKGROUND

[0002] Tobacco is generally not filled when being loaded into a tobacco box, and has a certain amount of air inside, while the tobacco loaded into the tobacco box by a packing station has a certain temperature, and the air in the tobacco box has moisture, so that when the humid hot air in the packed tobacco box acts on the inner wall of the tobacco box and cools down, condensation will be formed on the inner wall of the tobacco box. The existing tobacco loading box directly covers the box cover after the tobacco is put in to seal the box, and there is no channel to realize the air extraction treatment of the inside of the tobacco box after sealing, so that the humid hot air in the tobacco box will form condensation on the inner wall of the tobacco box, affecting the quality of the tobacco. UTILITY MODEL CONTENT

[0003] In view of the above problems, the utility model provides a normally closed conduction device, an air extraction assembly and a tobacco box, which can conveniently assist in realizing air extraction of the tobacco box to alleviate the condensation problem on the inner wall of the tobacco box.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme:

[0005] In a first aspect, the utility model provides a normally closed conduction device, which comprises a bottom plate, an extension column, an outer sleeve, a driving part, an elastic part, an inner sleeve and a horizontal moving block.

[0006] The outer sleeve and the inner sleeve are fixedly installed on the bottom plate, and the inner sleeve penetrates the bottom plate; the upper part of the inner sleeve is provided with a limiting through slot penetrating both sides of the inner sleeve on the opposite side walls;

[0007] The outer sleeve is located outside the inner sleeve, and the outer sleeve and the inner sleeve are provided with a sealing ring between the bottoms to form an air outlet cavity at the bottoms; the outer sleeve and the inner sleeve are respectively provided with air outlet through holes penetrating the side walls at the side walls corresponding to the air outlet cavity;

[0008] The extension column is sleeved in the inner sleeve and can axially slide along the inner sleeve; the extension column is provided with an inclined slot penetrating both sides of the extension column;

[0009] The middle part of the horizontal moving block is provided with a horizontal moving middle part matched with the inclined slot and horizontal moving end parts located at both ends of the horizontal moving middle part; the upper and lower end faces of the horizontal moving middle part and the horizontal moving end parts are located on the same horizontal plane and are flush with the upper and lower slot walls of the limiting through slot respectively; the end faces of the two horizontal moving end parts are inclined surfaces and the two inclined surfaces are parallel to each other;

[0010] The driving member is sleeved in the outer sleeve, and the inner wall of the driving member is provided with wedge blocks at opposite positions, and the wedge blocks are respectively provided with inclined surfaces which are matched with the inclined surfaces of the two transverse end portions one by one.

[0011] The elastic member is located between the telescopic column and the driving member.

[0012] Further, the end face of the telescopic column close to the bottom plate is flush with the bottom face of the bottom plate, and when the telescopic column slides away from the bottom plate, the end portion of the telescopic column close to the bottom plate is staggered with the air outlet holes on the side wall of the inner sleeve, so that the inner sleeve is communicated with the air outlet cavity.

[0013] Further, the air outlet holes are uniformly distributed on the side wall of the outer sleeve or the inner sleeve in the circumferential direction.

[0014] Further, the driving member is a cylindrical structure which is sealed at the end portion away from the bottom plate.

[0015] The outer sleeve is provided with a limiting ring extending to the center of the end portion away from the bottom plate, the inner diameter of the limiting ring is smaller than the outer diameter of the driving member, and the end portion of the driving member away from the bottom plate abuts against the limiting ring under the action of the elastic member.

[0016] Further, the air guide sleeve is fixedly installed on the bottom plate and located at the periphery of the outer sleeve, and the air guide sleeve and the outer sleeve form an air outlet channel which is communicated with the air outlet cavity.

[0017] Further, the end portion of the inner sleeve close to the bottom plate is provided with a sealing ring.

[0018] Further, when the end face of the telescopic column close to the bottom plate is flush with the bottom face of the bottom plate, one of the transverse end portions abuts against the telescopic column to limit the telescopic column from continuously moving towards the bottom plate.

[0019] On the other hand, the utility model also provides a kind of air extraction assembly, comprising air extraction head, further comprising the air guide device of any one of the above, the air extraction head includes abutting member, the air extraction channel is formed in the air extraction head, so that when the abutting member presses driving member, the air extraction head is located at the periphery of the outer sleeve and makes the air extraction channel be communicated with the end portion of the inner sleeve close to the bottom plate.

[0020] Further, the air extraction head includes sealing cover, the sealing cover is located at the periphery of the abutting member, and can be covered in the air guide device.

[0021] In another aspect, the utility model also provides a cut tobacco box, comprising the air guide device of any one of the above.

[0022] Compared with the prior art, the closed conduction device, the air extraction assembly and the tobacco box provided by the utility model have the beneficial effects that: the closed conduction device is used for solving the problem that the tobacco box is difficult to extract air, and the closed conduction device is used for realizing conduction when the tobacco box is extracted air, so that the air in the tobacco box is partially extracted, after the air extraction is completed, the closed conduction device is used for isolating the tobacco box from the outside, and the air outside cannot enter the tobacco box, so that most of the air in the tobacco box is extracted and has a certain vacuum degree, and the problem of condensation on the inner wall of the tobacco box is greatly alleviated, the condensation in the tobacco box is reduced as much as possible or even completely avoided, the tobacco box is kept dry, and the quality of the tobacco in the tobacco box is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will briefly introduce the drawings needed to be used in the embodiment description.

[0024] Figure 1 It is a structural schematic view of the conduction device of the utility model;

[0025] Figure 2 It is a sectional view of the conduction device of the utility model;

[0026] Figure 3 It is a sectional view of the bottom plate, the outer sleeve and the inner sleeve in the utility model;

[0027] Figure 4 It is a sectional view of the driving member in the utility model;

[0028] Figure 5 It is a structural schematic view of the telescopic column in the utility model;

[0029] Figure 6 It is a structural schematic view of the transverse moving block in the utility model;

[0030] Figure 7 It is an implementation schematic view of the conduction device in the utility model (the air extraction head is not inserted);

[0031] Figure 8 It is an implementation schematic view of the conduction device in the utility model (the air extraction head is inserted);

[0032] Figure 9 It is an implementation sectional view of the conduction device in the utility model (the air extraction head is inserted);

[0033] Figure 10 It is a structural schematic view of the air extraction assembly of the utility model;

[0034] Figure 11 It is a structural schematic view of the air extraction head of one example in the utility model;

[0035] Figure 12 Structure diagram of the air suction assembly of another example in the utility model (air suction head insertion);

[0036] Figure 13 Structure diagram of the air suction head of another example in the utility model;

[0037] Figure 14 Structure diagram of the air suction assembly of another example in the utility model (air suction head insertion);

[0038] Figure 15 Structure diagram of the tobacco box of the utility model.

[0039] Wherein, the marks shown in the figure are: 10 - base plate; 11 - telescopic column; 12 - outer sleeve; 121 - limiting ring; 13 - driving member; 131 - wedge block; 14 - elastic member; 15 - inner sleeve; 151 - limiting through slot; 16 - transverse moving block; 161 - transverse moving middle part; 162 - transverse moving end part; 17 - air guide sleeve; 18 - inclined groove; 19 - sealing ring; 110 - air outlet cavity; 111 - air outlet through hole; 112 - air outlet channel; 20 - air suction head; 21 - abutting member; 22 - air suction channel; 23 - sealing cover; 80 - conduction device; 100 - tobacco box; 101 - box body; 102 - box cover. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0041] In the description of the utility model, it should be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0042] In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the term "installation", "connection" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication。For ordinary skilled in the art, the above-mentioned term can be understood in the specific meaning in the utility model according to specific circumstances.In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0043] The first embodiment of the utility model provides a normally closed type conducting device for tobacco box air extraction, the normally closed type conducting device is installed on the tobacco box, and is preferably installed on the lid of the tobacco box, so that when the tobacco box is sealed, the normally closed type conducting device is used to realize the conduction with the outside to realize the air extraction of the inside of the tobacco box, after the air extraction is completed, the airflow channel in the conducting device is cut off and closed, at this time, the outside air cannot enter the tobacco box, so that most of the air in the tobacco box is extracted and has a certain vacuum degree.

[0044] Please refer to Figures 1 to 6 The normally closed type conducting device comprises a bottom plate 10, a telescopic column 11, an outer sleeve 12, a driving part 13, an elastic part 14, an inner sleeve 15 and a transverse block 16.

[0045] The bottom plate 10 is fixedly installed on the lid in implementation, specifically, the lid is provided with a through slot to accommodate the normally closed type conducting device, the bottom plate 10 is installed on the lid by bolts and is flush with the inner wall of the lid, and the outer sleeve 12 is disposed outward.

[0046] The outer sleeve 12 and the inner sleeve 15 are fixedly installed on the bottom plate 10, preferably, the outer sleeve 12 and the inner sleeve 15 can be integrally formed with the bottom plate 10.The inner sleeve 15 penetrates through the bottom plate 10, so that the inward end of the inner sleeve 15 can be in communication with the inside of the tobacco box and can be part of the airflow channel.The upper part of the inner sleeve 15 is provided with a limiting through slot 151 penetrating through both sides of the inner sleeve 15 on the opposite side walls, and the upper and lower groove walls of the limiting through slots 151 on both sides are flush with each other, and the upper and lower groove walls are the axial extension direction of the inner sleeve 15, for example, the upper groove wall is the groove wall corresponding to the outward end of the inner sleeve 15, and the lower groove wall is the groove wall corresponding to the inward end of the inner sleeve 15.

[0047] The outer sleeve 12 and the inner sleeve 15 are both cylindrical structures, the outer sleeve 12 is located at the periphery of the inner sleeve 15 and is coaxially arranged, the outer sleeve 12 and the inner sleeve 15 are provided with a sealing ring 19 between the bottoms, the inner ring of the sealing ring 19 is tightly connected with the outer wall of the inner sleeve 15, and the outer ring is tightly connected with the inner wall of the outer sleeve 12, so as to form an air outlet cavity 110 at the bottom, the air outlet cavity 110 is between the sealing ring 19, the bottom plate 10, the outer sleeve 12 and the inner sleeve 15, the outer sleeve 12 and the inner sleeve 15 are respectively provided with air outlet through holes 111 penetrating the side wall at the side wall corresponding to the air outlet cavity 110, when the air outlet through holes 111 are conducted, air can enter the air outlet cavity 110 through the air outlet through hole 111 on the side of the inner sleeve 15 and then go out through the air outlet through hole 111 on the side of the outer sleeve 12. The air outlet through holes 111 are uniformly distributed on the side wall of the outer sleeve 12 or the inner sleeve 15 in the circumferential direction, so that when they are conducted, a larger conduction channel can be realized to achieve faster air extraction.

[0048] The telescopic column 11 is matched and sleeved in the inner sleeve 15 and can slide axially along the inner sleeve 15, the outer diameter of the telescopic column 11 is consistent with the inner diameter of the inner sleeve 15 as much as possible, so that when the telescopic column 11 is located in the inner sleeve 15, air cannot pass through the gap between the telescopic column 11 and the inner sleeve 15. The telescopic column 11 is provided with an inclined groove 18 penetrating both sides of the telescopic column 11, and the cross section of the inclined groove 18 is square. In order to ensure air tightness, the inner sleeve 15 is provided with a sealing ring at the inner wall of the end portion close to the bottom plate 10, and then the end portion of the telescopic column 11 is located at the position of the end portion of the inner sleeve 15 close to the bottom plate 10 and acts with the sealing ring to ensure good air tightness and prevent gas from entering and exiting. It can be understood that the setting of the sealing ring and other structures does not affect the sliding of the telescopic column 11 in the inner sleeve 15.

[0049] The middle part of the transverse moving block 16 is provided with a transverse moving middle part 161 matched with the inclined groove 18 and transverse moving end parts 162 located at both ends of the transverse moving middle part 161, the upper and lower end faces of the transverse moving middle part 161 and the transverse moving end parts 162 are located on the same horizontal plane and are flush with the upper and lower groove walls of the limiting through groove 151, that is, the upper end faces of the transverse moving middle part 161 and the transverse moving end parts 162 are located on the same horizontal plane, and the lower end faces of the transverse moving middle part 161 and the transverse moving end parts 162 are located on the same horizontal plane and are flush with the upper and lower groove walls of the limiting through groove 151. The two transverse moving end parts 162 are inclined surfaces at the end faces away from each other, and the two inclined surfaces are parallel to each other, and the inclined surface of the transverse moving end part 162 close to the higher position is gradually inclined outward from the position close to the middle part to the position away from the middle part.

[0050] The driving member 13 is sleeved in the outer sleeve 12, the outer diameter of the driving member 13 is equal to the inner diameter of the outer sleeve 12, and in the preferred embodiment, a sliding rail (not shown in the figure) is arranged between the driving member 13 and the outer sleeve 12, so that the driving member 13 and the outer sleeve 12 only slide axially relative to each other and do not rotate. The inner wall of the driving member 13 is provided with a wedge block 131 at the opposite position, and the two wedge blocks 131 are respectively provided with inclined surfaces, which are matched with the inclined surfaces of the two transverse end portions 162 one by one.

[0051] The elastic member 14 is located between the telescopic column 11 and the driving member 13, and the elastic member 14 is preferably a compression spring. The elastic member 14 has sufficient reset strength to ensure that the reset can be realized.

[0052] In the preferred embodiment, the end of the telescopic column 11 close to the bottom plate 10 is flush with the bottom surface of the bottom plate 10, and when the telescopic column 11 slides away from the bottom plate 10, the end of the telescopic column 11 close to the bottom plate 10 is misaligned with the air outlet hole 111 on the side wall of the inner sleeve 15, so that the inner sleeve 15 is in communication with the air outlet cavity 110.

[0053] Preferably, the normally closed conduction device further comprises a gas guide sleeve 17, which is fixedly installed on the bottom plate 10 and located outside the outer sleeve 12. The gas guide sleeve 17 and the outer sleeve 12 form an air outlet channel 112 that communicates with the air outlet cavity 110. Air can pass through the air outlet channel 112, enter the air outlet channel 112 through the air outlet cavity 110, and then exit. The inner wall of the gas guide sleeve 17 and the outer wall of the outer sleeve 12 are respectively provided with sealing rings, so that when the air suction head is inserted, the air suction head can be matched with the air suction head to form a relatively airtight chamber.

[0054] The driving member 13 is a cylindrical structure with a closed end away from the bottom plate 10. The outer sleeve 12 is provided with a limiting ring 121 extending to the center of the end at the end away from the bottom plate 10. The inner diameter of the limiting ring 121 is smaller than the outer diameter of the driving member 13, and the end of the driving member 13 away from the bottom plate 10 abuts against the limiting ring 121 under the action of the elastic member 14. By arranging the limiting ring 121, on the one hand, the driving member 13 can be limited to prevent it from moving outward, and on the other hand, the limiting ring 121 can provide protection. Only the inner ring of the limiting ring 121 can apply force to the driving member 13, and external force acting on the outer sleeve 12 and the limiting ring 121 cannot press the driving member 13, thereby avoiding accidental touch. In this embodiment, a protruding mechanism can be arranged on the external device, such as the air suction head, at the corresponding position to pass through the limiting ring 121 and act on the pressing member 143 to press the driving member 13 and retract the telescopic column 11.

[0055] In the example embodiment, when the telescopic column 11 is flush with the bottom surface of the bottom plate 10, one of the transverse end portions 162 abuts against the telescopic column 11 to limit the telescopic column 11 from moving further towards the bottom plate 10, so that the telescopic column 11 does not protrude out of the bottom plate 10, avoiding interference with the cleaning of the tobacco box, and because the tobacco box is under negative pressure after air extraction, the telescopic column 11 has a tendency to move inward but is limited, ensuring the sealing effect.

[0056] The following is a specific implementation of the example embodiment, which can be referred to Figures 7 to 9 , when the tobacco box is implemented, the bottom plate 10 is located inside the box cover, the gas guide sleeve 17 and the outer sleeve 12 slightly protrude outside the box cover, the air extraction head 20 is driven by an external device (such as a robot hand) and abuts against the guide device, at this time, the abutting piece 21 on the air extraction head 20 presses the driving piece 13 inward, the air extraction head 20 gradually inserts into the air outlet channel 112 and tightly abuts against both sides of the air outlet channel 112, at this time, the air extraction channel 22 on the air extraction head 20 is in communication with the air outlet channel 112, the abutting piece 21 continuously drives the driving piece 13 inward, driving the two wedge blocks 131 to move inward, the two wedge blocks 131 act on the inclined surfaces of the corresponding two transverse end portions 162, at this time, under the limiting action of the limiting grooves 151 on both sides of the inner sleeve 15, the transverse block 16 can only move transversely, and in the transverse movement of the transverse block 16, the transverse middle portion 161 and the inclined slot 18 of the telescopic column 11 act, thereby driving the telescopic column 11 to move outward, that is, the end portion of the telescopic column 11 near the bottom plate 10 retracts towards the inner sleeve 15 and presses the elastic piece 14, continuously pressing the driving piece 13, the telescopic column 11 continuously retracts, until the end surface of the telescopic column 11 exceeds the air outlet through hole 111 of the inner sleeve 15, at this time, as shown in 9, the air outlet through hole 111 on the side of the inner sleeve 15 can communicate with the inside of the tobacco box, thereby forming an air flow channel with the air extraction channel 22 on the air extraction head 20, at this time, the air extraction head 20 is extracted by an external device, thereby partially extracting the air in the tobacco box. Figure 2 At this time, the tobacco box is isolated from the outside world, and the air from the outside world cannot enter the tobacco box, so that most of the air in the tobacco box is extracted and has a certain vacuum degree, and because most of the air is extracted, the problem of condensation on the inner wall of the tobacco box can be greatly alleviated, and the condensation in the tobacco box is reduced as much as possible or even completely avoided, the inside of the tobacco box is kept dry, and the quality of the tobacco in the tobacco box is ensured.

[0057] The second embodiment of the utility model provides an air extraction assembly, referring to Figures 1 to 11 , including air extraction head 20 and the on device of above-mentioned embodiment, air extraction head 20 includes abutment piece 21, and air extraction channel 22 is formed in air extraction head 20, to when abutment piece 21 presses driving part 13, air extraction head 20 is located the periphery of outer sleeve 12 and lets air extraction channel 22 and inner sleeve 15 close the end portion of bottom plate 10 intercommunication. When implementing, air extraction head 20 can be installed on the driving mechanism such as machine hand, and the power of intercommunication external negative pressure device and so on provides air extraction to realize air extraction, by air extraction head 20 drive abutment piece 21 to enter on device and press driving part 13, drive telescopic column 11 to retract continuously, until the end surface of telescopic column 11 exceeds the air outlet hole 111 of inner sleeve 15, to can let the air outlet hole 111 of inner sleeve 15 in tobacco box interior, air outlet cavity 110, the air outlet hole 111 of outer sleeve 12 side, air extraction channel 112 form a gas flow channel and with the air extraction channel 22 on air extraction head 20 intercommunication, to help realize the air extraction of tobacco box interior.

[0058] In the exemplary embodiment, air extraction head 20 is in the form of a cylindrical structure, with an open lower end, and a sidewall that can be inserted into the air extraction channel 112, and the air extraction channel 22 extends from the lower end to the top, so that when inserted, the air extraction channel 22 can be in communication with the air extraction channel 112, to facilitate air extraction.

[0059] In another implementation, referring to Figures 12 to 14 , air extraction head 20 includes a sealing cover 23, which is located around the abutment piece 21 and can cover the on device. When the abutment piece 21 is driven by the air extraction head 20 to press the driving part 13 in the on device, retract the telescopic column 11, and form a gas flow channel from the air outlet hole 111 of the inner sleeve 15 in the tobacco box interior, the air outlet cavity 110, the air outlet hole 111 of the outer sleeve 12 side, the air extraction channel 112, and the air extraction channel 22 on the air extraction head 20, the end of the sealing cover 23 can abut the lid of the tobacco box. At this time, a relatively dense space can be formed inside the sealing cover 23, and air extraction through the air extraction channel 22 of the air extraction head 20 can achieve air extraction of the tobacco box interior.

[0060] The third embodiment of the utility model, referring to Figures 1 to 6 and Figure 15The tobacco box 100 comprises a box body 101 and a box cover 102, and the through device 80 is installed on the box cover 102. After the tobacco is loaded into the box body 101, the box cover 102 is arranged on the box body 101 to form a closed space of the tobacco box 100 as much as possible, so that the tobacco is prevented from being polluted by gas. In order to avoid or reduce the condensation in the tobacco box, one way is to extract the air in the tobacco box, that is, to extract part of the air. The tobacco box of the utility model is provided with the through device, and the extraction of the air in the tobacco box can be easily realized. After part of the air is extracted, the through opening and other passages can be blocked. At this time, the tobacco box is isolated from the outside, and the air outside cannot enter the tobacco box, so that most of the air in the tobacco box is extracted and has a certain vacuum degree. Since most of the air is extracted, the problem of condensation on the inner wall of the tobacco box can be greatly alleviated, the condensation in the tobacco box is reduced as much as possible or even completely avoided, the tobacco box is kept dry, and the quality of the tobacco in the tobacco box is ensured.

[0061] The above is only a specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this. Any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A normally closed on device, characterized by, The device comprises a base plate (10), a telescopic column (11), an outer sleeve (12), a driving member (13), an elastic member (14), an inner sleeve (15) and a transverse block (16); The outer sleeve (12) and the inner sleeve (15) are fixedly installed on the base plate (10), and the inner sleeve (15) penetrates through the base plate (10); the upper portion of the inner sleeve (15) is provided with a limiting through slot (151) on the opposite side walls, which penetrates through the two sides of the inner sleeve (15); The outer sleeve (12) is located at the periphery of the inner sleeve (15), and the outer sleeve (12) and the inner sleeve (15) are provided with a sealing ring (19) between the bottoms to form an air outlet cavity (110) at the bottom, and the outer sleeve (12) and the inner sleeve (15) are respectively provided with air outlet through holes (111) penetrating through the side walls at the side walls corresponding to the air outlet cavity (110); The telescopic column (11) is sleeved in the inner sleeve (15) and can axially slide along the inner sleeve (15), and the telescopic column (11) is provided with an inclined slot (18) penetrating through the two sides of the telescopic column (11); The middle portion of the transverse block (16) is provided with a transverse middle portion (161) matched with the inclined slot (18) and transverse end portions (162) located at the two ends of the transverse middle portion (161), the upper and lower end faces of the transverse middle portion (161) and the transverse end portions (162) are located on the same horizontal plane respectively and are flush with the upper and lower slot walls of the limiting through slot (151) respectively; the end faces of the two transverse end portions (162) are inclined surfaces respectively and the two inclined surfaces are parallel to each other; The driving member (13) is slidably sleeved in the outer sleeve (12), and the inner wall of the driving member (13) is provided with wedge blocks (131) at opposite positions, and the two wedge blocks (131) are respectively provided with inclined surfaces which are matched with the inclined surfaces of the two transverse end portions (162) respectively and one-to-one; The elastic member (14) is located between the telescopic column (11) and the driving member (13).

2. The normally closed on-off device according to claim 1, wherein The end face of the telescopic column (11) close to the base plate (10) is flush with the bottom face of the base plate (10), and when the telescopic column (11) slides away from the base plate (10), the end portion of the telescopic column (11) close to the base plate (10) is staggered with the air outlet through hole (111) on the side wall of the inner sleeve (15) to make the inner sleeve (15) communicated with the air outlet cavity (110).

3. The normally closed on-off device according to claim 1, wherein The air outlet through holes (111) are uniformly distributed on the side wall of the outer sleeve (12) or the inner sleeve (15) around the circumference.

4. The normally closed on-off device according to claim 1, wherein The driving member (13) is a cylindrical structure which is sealed at the end portion away from the base plate (10). The outer sleeve (12) is provided with a limiting ring (121) extending to the center of the end portion away from the bottom plate (10), the inner diameter of the limiting ring (121) is smaller than the outer diameter of the driving member (13), and the end portion of the driving member (13) away from the bottom plate (10) abuts against the limiting ring (121) under the action of the elastic member (14).

5. The normally closed conduction device according to claim 1, characterized in that, Further comprising a gas guide sleeve (17) fixedly installed on the bottom plate (10) and located at the periphery of the outer sleeve (12), the gas guide sleeve (17) and the outer sleeve (12) form an air outlet channel (112) communicating with the air outlet cavity (110).

6. The normally closed conduction device according to claim 1, characterized in that, The inner sleeve (15) is provided with a sealing ring at the end portion inner wall close to the bottom plate (10).

7. The normally closed conduction device according to claim 2, characterized in that, When the telescopic column (11) is flush with the bottom surface of the bottom plate (10) at the end surface close to the bottom plate (10), one of the transverse moving end portions (162) abuts against the telescopic column (11) to limit the telescopic column (11) from continuing to move towards the bottom plate (10).

8. An air extraction assembly comprising an air extraction head (20), characterized in that, Further comprising the conduction device according to any one of claims 1 to 7, the air extraction head (20) comprises an abutting member (21), the air extraction head (20) forms an air extraction channel (22) therein, so that when the abutting member (21) presses the driving member (13), the air extraction head (20) is located at the periphery of the outer sleeve (12) and the air extraction channel (22) is communicated with the end portion of the inner sleeve (15) close to the bottom plate (10).

9. The air extraction assembly according to claim 8, characterized in that, The air extraction head (20) comprises a sealing cover (23) located at the periphery of the abutting member (21) and capable of covering the conduction device.

10. A tobacco box, characterized in that The conduction device according to any one of claims 1 to 7.

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