Dustproof sealing device

Abstract

The utility model discloses a dustproof sealing device which comprises a shell, a center shaft, an end cover, a rod set and a fixing ring, a dustproof ring is arranged between the end cover and the center shaft, and a first sealing piece and a second sealing piece which are used for sealing are arranged between the shell and the center shaft. The first sealing piece and the second sealing piece are located between the end cover and the bearing, and the second sealing piece is close to the bearing relative to the position of the first sealing piece; the fixing ring is located between the first sealing piece and the end cover and fixed to the center shaft. The rod set transversely moves on the fixing ring, one end of the rod set can make acting contact with the first sealing piece, and under the action of the rod set, the first sealing piece can deform in the radial direction to extend or retract, and the contact with the center shaft and the shell is increased or decreased. The sealing device is simple and compact in structure, can achieve sealing of multiple rotating positions between the shell and the center shaft, effectively prevents dust from entering, can adjust the sealing performance of one position of the shell and the center shaft, and is suitable for different rotating speeds.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing, in particular to a dustproof sealing device. Background Art

[0002] In mechanical structures, rotational motion is a common form of motion and is widely used in various equipment, such as centrifugal pumps, centrifuges, reactors, compressors, etc.

[0003] Taking the roller of a belt conveyor as an example, the rotating mechanism mainly includes a roller body, a central shaft 20, and an end cover 30. Specifically, the roller body is mounted on the central shaft 20 via a bearing 50, and the end cover 30 is mounted on the end side of the roller body and seals the bearing 50. During the operation of the roller, a sealing structure is required to seal the roller to prevent dust and the like in the operating environment from entering the bearing 50, thereby affecting the rotation of the bearing 50 and causing damage to it.

[0004] The existing sealing structure mainly sets a dust ring 31 on the outside of the bearing 50, such as at the end cover 30 and the center shaft 20. On the one hand, this single dust ring 31 cannot meet the use environment with a large amount of dust, and it is easy to cause dust to enter the bearing 50 after long-term use. On the other hand, in order to ensure the sealing performance, the existing seal is in close contact with the center shaft 20. However, when the (roller) shell 10 and the center shaft 20 rotate at high speed for a period of time, the seal will produce continuous friction with the contact surface and cause surface wear. At this time, the wear will gradually reduce the sealing performance of the seal ring, thereby causing dust to enter the bearing 50. Summary of the Invention

[0005] The purpose of the utility model is to provide a dustproof sealing device with a simple and compact structure, which can realize multiple sealings between the shell and the central shaft during rotation, effectively prevent the entry of dust, and can adjust the sealing performance between the shell and the central shaft at one point to be suitable for different rotation speeds.

[0006] To achieve the above purpose, the dustproof sealing device includes:

[0007] Shell, center shaft, end cover, the shell is rotatably mounted on the center shaft through bearings, and the end cover is sealed and installed on the end side of the shell;

[0008] A dust ring is provided between the end cover and the center shaft;

[0009] A first seal and a second seal are provided between the housing and the central shaft for sealing; the first seal and the second seal are located between the end cover and the bearing, and the second seal is located closer to the bearing relative to the first seal;

[0010] Also includes:

[0011] a fixed ring, located between the first sealing member and the end cover and fixed on the central shaft;

[0012] The rod group moves laterally on the fixed ring, and one end of the rod group can contact the first sealing member. Under the action of the rod group, the first sealing member can deform radially to extend or retract, increase or decrease the contact with the central shaft and the housing.

[0013] In some examples, the rod set includes a plurality of circumferentially arranged second guide rods;

[0014] Each second guide rod is transversely threadedly mounted on the fixing ring, and one end of each second guide rod acts on the first sealing member.

[0015] In some examples, the fixing ring is provided with a plurality of hole groups evenly arranged circumferentially;

[0016] The hole group comprises radially arranged first holes and axially arranged second holes communicating with the first holes;

[0017] The rod group comprises: a first guide rod and a second guide rod;

[0018] a first guide rod, located in the first hole and moved toward the axis of the central shaft by the elastic force of the elastic member;

[0019] a second guide rod, movable and located in the second hole and capable of exerting a pressing effect on the first sealing member;

[0020] When the first guide rod moves closer to or farther from the axis of the central shaft, the second guide rod moves closer to or farther from the first sealing member.

[0021] In some examples, one end of the first guide rod near the central axis has an inclined cross-section; the second guide rod is slidably located in the second hole, and one end of the second guide rod facing the first guide rod has an inclined cross-section and is aligned with the inclined cross-section of the first guide rod;

[0022] Alternatively, the adjacent ends of the first guide rod and the second guide rod are linked via a connecting rod.

[0023] In some examples, a first limiting block is provided on the first guide rod, and the first limiting block matches the first limiting hole in the first hole so that the first guide rod is circumferentially limited;

[0024] The second guide rod is provided with a second limiting block, which matches the second limiting hole in the second hole so that the second guide rod is limited in circumferential direction.

[0025] In some examples, a top pressure ring is provided between the second guide rod and the first sealing member;

[0026] The top pressure ring set slides on the central shaft.

[0027] In some examples, the first hole is closed by a threaded third locking rod;

[0028] The elastic member is located between the first guide rod and the third locking rod.

[0029] In some examples, the housing is provided with a threaded hole;

[0030] The axis of the threaded hole and the axis of the first hole are co-located on a cross section perpendicular to the axis of the central shaft;

[0031] The threaded hole is threadably closed by the first locking rod.

[0032] In some examples, the threaded hole has a diameter greater than a diameter of the first hole;

[0033] The distance from the circumference of the fixing ring to the inner wall of the housing is smaller than the length of the third locking rod.

[0034] In some examples, the housing and the central shaft form an inner cavity for accommodating the bearing;

[0035] A first slotted hole with one end open is provided along the axis of the central shaft, and the first slotted hole is closed by a second locking rod connected by a thread;

[0036] A second slotted hole is provided on the central axis and is arranged radially to connect the inner cavity and the first slotted hole;

[0037] The shell is provided with an oil nozzle connected to the inner cavity.

[0038] Compared with the prior art, the dustproof sealing device of the present invention has a dustproof ring between the end cover and the central shaft, and a first sealing member and a second sealing member for sealing between the housing and the central shaft. Therefore, it is possible to achieve multiple sealing points between the housing and the central shaft during rotation, effectively preventing the ingress of dust. In addition, the lateral movement of the rod group can act on the first sealing member, so that the first sealing member can deform radially to extend or retract, increase or decrease the contact with the central shaft and the housing, thereby achieving adjustment of the sealing performance and adapting to different rotation speeds.

[0039] Since the rod group includes a first guide rod and a second guide rod, the first guide rod is acted upon by the elastic force of the elastic member and the first guide rod and the second guide rod can be linked together. Therefore, under the condition that the sealing performance of the first seal is adjusted, when the rotation speed of the central shaft reaches a certain level, the first guide rod will radially move away from the central shaft due to centrifugal force and compress the elastic member, and the second guide rod will reduce the squeezing effect on the first seal, so that the first seal can appropriately retract in the radial direction and reduce deformation, thereby avoiding surface wear caused by continuous friction between the first seal and the contact surface under high-speed rotation, and this method can be adaptively adjusted according to the rotation speed of the central shaft; in addition, a top pressure ring is provided between the second guide rod and the first seal, and the top pressure ring can make the force acting on the first seal more uniform, and the radial deformation of the first seal is relatively dispersed and uniform;

[0040] The threaded hole is arranged on the shell, the axis of the threaded hole is same as the axis of the first hole in the cross section perpendicular to the axis of the central shaft, when the first sealing piece needs to be adjusted, the first locking rod is screwed off, the first hole on the central shaft is rotated to be consistent with the threaded hole, the adjustment tool is directly passed through the threaded hole to act on the third locking rod for adjustment, and the end cover is avoided from being disassembled to cause complicated operation. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is the overall schematic view of the utility model;

[0042] Figure 2 is Figure 1 is the local enlarged view of position A in the figure;

[0043] Figure 3 is the schematic view of assembly between the rod group and the fixing ring in the utility model (only one rod group is drawn)

[0044] In the figure: 10, shell, 11, oil nozzle, 12, threaded hole, 13, first locking rod;

[0045] 20, central shaft, 21, first slot hole, 22, second slot hole, 23, second locking rod;

[0046] 30, end cover, 31, dustproof ring;

[0047] 40, inner cavity;

[0048] 50, bearing;

[0049] 60, fixing ring, 61, first hole, 62, second hole;

[0050] 71, first guide rod, 72, second guide rod, 73, elastic piece, 74, third locking rod, 75, hole group, 76, pressing ring, 77, first sealing piece;

[0051] 80, second sealing piece. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme of the utility model embodiment will be clearly and completely described below by combining the drawings of the utility model specific embodiment. Same reference signs in the drawings represent same parts. It should be noted that the described embodiment is a part of the embodiment of the utility model, rather than all the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0053] Unless otherwise defined, technical terms or scientific terms used herein shall have the same meaning as would be understood by one of ordinary skill in the art to which this application belongs. The terms "first", "second", and similar terms do not imply any order, quantity, or importance, but are used to distinguish one element from another, and are used only to distinguish the different components. Similarly, the terms "one" or "a" or "an" do not necessarily mean "one", "single" or "only one". The terms "including", "comprising", "consisting of", and the like, mean the elements or objects that are recited in the term are included or encompassed, but do not exclude other elements or objects. The terms "connected", "coupled", and the like, mean any connection or coupling, either direct or indirect, between the elements or objects, and can encompass electrical connections, mechanical connections, or the like, whether or not it is direct or indirect. The terms "upper", "lower", "left", "right", and the like, are used only to represent relative positions, and when the absolute positions of the described objects are changed, the relative positions may also be changed accordingly.

[0054] As shown in Figure 1 , Figure 2 , the dustproof sealing device comprises:

[0055] a housing 10, a central shaft 20, and an end cover 30, the housing 10 is rotatably installed on the central shaft 20 through a bearing 50, and the end cover 30 is closed and installed on the end side of the housing 10;

[0056] characterized in that,

[0057] a dustproof ring 31 is arranged between the end cover 30 and the central shaft 20;

[0058] a first sealing element 77 and a second sealing element 80 are arranged between the housing 10 and the central shaft 20 for sealing;

[0059] the first sealing element 77 and the second sealing element 80 are located between the end cover 30 and the bearing 50, and the second sealing element 80 is closer to the bearing 50 than the first sealing element 77;

[0060] The device further comprises:

[0061] a fixing ring 60 is located between the first sealing element 77 and the end cover 30, and is fixed on the central shaft 20;

[0062] a rod group is connected to the fixing ring 60, and the output end of the rod group can move transversely and act on the first sealing element 77, so that the first sealing element 77 is transversely extruded and radially deformed to increase the contact with the central shaft 20 and the housing 10;

[0063] Specifically, the housing 10, the central shaft 20, and the end cover 30 are the main components of the rotating device, and the housing 10 and the central shaft 20 are connected through the bearing 50 to ensure relative rotation;

[0064] A dustproof ring 31 is provided between the end cover 30 and the central shaft 20 . The dustproof ring 31 is configured to perform a preliminary seal on the end cover 30 to prevent dust, especially large dust particles, from entering.

[0065] The inner wall of the housing 10 may be provided with a positioning groove for placing the first seal 77 and the second seal 80, from the end cover 30 to the bearing 50.

[0066] One end of the positioning groove where the first seal 77 is located is open, and the opening direction is toward the rod group, or one end of the positioning groove where the first seal 77 is located is provided with a through hole through which the rod group can pass, the purpose of which is to ensure that the rod group can act laterally on the first seal 77; the first seal 77 can perform a secondary seal between the housing 10 and the central shaft 20, and the effect of the secondary seal can be adjusted to prevent small particles of dust from entering; the first seal 77 is an annular elastic body with a circular or rectangular cross-section, such as a sealing ring. The number of first seals 77 can be multiple and arranged side by side, and each first seal 77 has a certain elasticity so that multiple first seals 77 are compressed; the second seal 80 is configured to provide a final seal;

[0067] The fixing ring 60 rotates coaxially with the central shaft 20 and can be welded to the central shaft 20 or directly formed as a shoulder structure of the central shaft 20;

[0068] a rod assembly configured to move laterally to compress the first seal 77;

[0069] When the dustproof sealing device is in use, the dustproof ring 31, the first seal 77, the second seal 80 are assembled, and the housing 10, the central shaft 20, and the end cover 30 are assembled. At this time, the housing 10 and the central shaft 20 can rotate relative to each other, and the end cover 30 is installed on the end side of the housing 10;

[0070] During assembly, the position of the rod group is adjusted so that one end of the rod group acts on the first seal 77, that is, the rod group approaches the first seal 77 laterally and squeezes it. Taking the central shaft 20 as a reference for explanation, after the first seal 77 is squeezed in the axial (lateral) direction, it can deform and extend in the radial direction, thereby increasing the contact force and contact surface with the central shaft 20 and the housing 10. At this time, the sealing effect of the first seal 77 is enhanced. Correspondingly, when the rod group moves laterally away from the first seal 77, the first seal 77 rebounds by itself and deforms and retracts in the radial direction, thereby reducing the contact force and contact surface with the central shaft 20 and the housing 10. At this time, the sealing effect of the first seal 77 is reduced. It is explained that under normal circumstances, the first seal 77 is assembled in the positioning groove of the housing 10 and can contact the housing 10 and the central shaft 20 to achieve a certain sealing effect.

[0071] Relative to the first seal 77, the dust ring 31 can perform preliminary sealing close to the outside world to prevent dust from entering the housing 10 from the outside; the first seal 77 can perform secondary sealing, and the sealing effect can be adjusted under the action of the rod group; the second seal 80 can perform final sealing close to the bearing 50, so this dustproof sealing device can perform multi-layer sealing, and the first seal 77 can adjust the sealing effect according to the use environment.

[0072] As an embodiment of the lateral movement of the rod group, the rod group includes a plurality of circumferentially arranged second guide rods 72;

[0073] Each second guide rod 72 is transversely threadedly mounted on the fixing ring 60 and has one end acting on the first sealing member 77;

[0074] Specifically, the second guide rod 72 is moved by a threaded connection, and can laterally squeeze the first sealing member 77 to adjust the sealing effect of the first sealing member 77;

[0075] However, this method still has the following problems: 1. When adjusting the seal of the first seal 77, the end cover 30 needs to be disassembled as a whole, which easily causes dust to enter during disassembly and is cumbersome. 2. When the radial deformation of the first seal 77 is large and the sealing effect is good, the relative rotation speed of the housing 10 and the central shaft 20 is high and long, which can easily cause continuous friction of the first seal 77 and cause surface wear.

[0076] Therefore, as another embodiment of the lateral movement of the rod group, Figure 2 、 Figure 3 As shown, the fixing ring 60 is provided with a plurality of hole groups 75 evenly arranged in the circumferential direction;

[0077] The hole group 75 has radially arranged first holes 61 and axially arranged second holes 62 communicating with the first holes 61;

[0078] The rod group comprises: a first guide rod 71 and a second guide rod 72;

[0079] The first guide rod 71 is located in the first hole 61 and moves toward the axis of the central shaft 20 under the elastic force of the elastic member 73;

[0080] A second guide rod 72 is movable and located in the second hole 62;

[0081] When the first guide rod 71 moves closer to the axis of the central shaft 20 , the second guide rod 72 moves to squeeze the first sealing member 77 ;

[0082] Specifically, the adjacent ends of the first guide rod 71 and the second guide rod 72 can be linked by a connecting rod, that is, the two ends of the connecting rod are respectively rotatably connected to the first guide rod 71 and the second guide rod 72, so that the radial movement of the first guide rod 71 toward the central axis 20 can be converted into the lateral movement of the second guide rod 72;

[0083] In the initial state, under the elastic force of the elastic member 73, one end of the first guide rod 71 can be connected to the second guide rod 72 through a connecting rod, so that one end of the second guide rod 72 acts on the first seal 77. At this time, the central shaft 20 can rotate at a certain speed without affecting the sealing of the first seal 77; when the rotation speed of the central shaft 20 reaches a certain level, under the action of centrifugal force, the first guide rod 71 will radially move away from the central shaft 20 and compress the elastic member 73. At this time, the first guide rod 71 will drive the second guide rod 72 to move, and one end of the second guide rod 72 reduces the squeezing effect on the first seal 77. The first seal 77 can retract appropriately in the radial direction to reduce deformation, thereby avoiding surface wear caused by continuous friction between the first seal 77 and the contact surface when the central shaft 20 rotates at high speed, and this method can be adaptively adjusted according to the rotation speed of the central shaft 20.

[0084] In some examples of the present invention, Figure 2 、 Figure 3 As shown, one end of the first guide rod 71 close to the axis of the central axis 20 is an inclined section;

[0085] The second guide rod 72 is slidably located in the second hole 62, and one end thereof facing the first guide rod 71 is an inclined cross-section and is in contact with the inclined cross-section of the first guide rod 71;

[0086] Alternatively, the adjacent ends of the first guide rod 71 and the second guide rod 72 are linked by a connecting rod;

[0087] Specifically, the inclined section of the first guide rod 71 matches the inclined section of the second guide rod 72, and the movement of the first guide rod 71 is converted into the movement of the second guide rod 72 through the section. Compared with the connecting rod form, the inclined section is simpler.

[0088] In some examples of the present invention, Figure 3 As shown, a first limiting block is provided on the first guide rod 71, and the first limiting block matches the first limiting hole in the first hole 61 so that the first guide rod 71 is circumferentially limited;

[0089] A second limiting block is provided on the second guide rod 72, and the second limiting block matches the second limiting hole in the second hole 62 so that the second guide rod 72 is circumferentially limited;

[0090] Specifically, the first limit block on the first guide rod 71 cooperates with the first limit hole in the first hole 61, and the second limit block on the second guide rod 72 cooperates with the second limit block in the second hole 62. The purpose is to ensure that the first guide rod 71 and the second guide rod 72 are more stable when moving and avoid circumferential misalignment.

[0091] In some examples of the present invention, Figure 3 As shown, a top pressure ring 76 is provided between the second guide rod 72 and the first sealing member 77;

[0092] The top pressure ring 76 is sleeved and slidably mounted on the central shaft 20;

[0093] Specifically, when the second guide rod 72 moves laterally and acts on the first seal 77, the radial deformation of the first seal 77 is mainly concentrated at the action position, and a top pressure ring 76 is provided between the second guide rod 72 and the first seal 77. The top pressure ring 76 can make the force acting on the first seal 77 more uniform, and the radial deformation of the first seal 77 is relatively dispersed and uniform.

[0094] In some examples of the present invention, Figure 2 As shown, the first hole 61 is closed by a third locking rod 74 that is threaded;

[0095] The elastic member 73 is located between the first guide rod 71 and the third locking rod 74;

[0096] Specifically, the third locking rod 74 is threadedly mounted on the first hole 61, forming the first hole 61 into a cavity with one end closed. At this time, the elastic member 73 and the first guide rod 71 are both located in the cavity.

[0097] When the third locking rod 74 is rotated to move in the first hole 61 , the first guide rod 71 changes due to the elastic force of the elastic member 73 , and the force of the second guide rod 72 acting laterally on the first sealing member 77 changes accordingly, thereby achieving sealing adjustment of the first sealing member 77 .

[0098] In some examples of the present invention, Figure 2 As shown, the housing 10 is provided with a threaded hole 12;

[0099] The axis of the threaded hole 12 and the axis of the first hole 61 are on the same cross section perpendicular to the axis of the central axis 20;

[0100] The threaded hole 12 is threadedly closed by a first locking rod 13;

[0101] Furthermore, the diameter of the threaded hole 12 is larger than the diameter of the first hole 61 , and the distance from the circumference of the fixing ring 60 to the inner wall of the housing 10 is smaller than the length of the third locking rod 74 ;

[0102] Specifically, when the seal of the first sealing member 77 needs to be adjusted, the first locking rod 13 can be removed by threading, and then the central shaft 20 can be rotated so that the first hole 61 thereon can be aligned with the threaded hole 12. The adjustment tool can be directly applied through the threaded hole 12 to the third locking rod 74 for adjustment, avoiding the need to remove the end cover 30 and causing cumbersome operation.

[0103] In addition, the diameter of the threaded hole 12 is larger than the diameter of the first hole 61, and the distance from the circumference of the fixing ring 60 to the inner wall of the shell 10 is smaller than the length of the third locking rod 74. This not only ensures that the third locking rod 74 can be directly installed through the threaded hole 12 and the first hole 61, but also prevents the third locking rod 74 from being stuck between the circumference of the fixing ring 60 and the inner wall of the shell 10.

[0104] In some examples of the present invention, Figure 1 As shown, the housing 10 and the central shaft 20 form an inner cavity 40 for accommodating the bearing 50;

[0105] A first slotted hole 21 with one end open is provided along the axis of the central shaft 20, and the first slotted hole 21 is closed by a second locking rod 23 connected by a thread.

[0106] The central shaft 20 is provided with a second slot 22 arranged radially and connecting the inner cavity 40 and the first slot 21;

[0107] The housing 10 is provided with an oil nozzle 11 connected to the inner cavity 40;

[0108] Specifically, the inner cavity 40 is formed by the second seal 80 close to the bearing 50, the housing 10, and the central shaft 20, which is a closed structure. Figure 1 In the embodiment, a seal may be provided on the other side of the central shaft 20 away from the bearing 50;

[0109] Lubricating liquid or grease can be injected into the inner cavity 40 from the oil nozzle 11 and discharged from the second slot 22 and the first slot 21 to identify whether the inner cavity 40 is full of lubricating liquid or grease;

[0110] The end side of the first slotted hole 21 is closed by a second locking rod 23 .

[0111] Furthermore, the second sealing member 80 is an oil seal;

[0112] The dustproof sealing device can perform preliminary sealing through the dustproof ring 31 at the end cover 30, and by adjusting the position of the rod group, one end of the rod group acts on the first seal 77, and the first seal 77 deforms radially to increase or decrease the contact with the central shaft 20 and the housing 10, thereby adjusting the sealing performance. As the rotation speed of the central shaft 20 increases, under the action of centrifugal force, the first guide rod 71 will radially move away from the central shaft 20 and compress the elastic member 73. The first seal 77 can appropriately retract in the radial direction to reduce deformation, which can avoid the central shaft 20 from rotating at high speed and causing surface wear due to continuous friction between the first seal 77 and the contact surface, thereby realizing adaptive adjustment of the seal under the rotation speed; the final sealing is performed by the second seal 80 near the bearing 50, so the dustproof sealing device effectively prevents dust from entering and is suitable for sealing at different rotation speeds.

[0113] The exemplary implementation of the dust sealing device proposed in the present invention is described in detail above with reference to the preferred embodiments. However, it can be understood by those skilled in the art that, without departing from the concept of the present invention, various variations and modifications can be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present invention can be combined in various ways without exceeding the scope of protection of the present invention, which is determined by the appended claims.

Claims

1. Dustproof sealing device, including: A housing (10), a central shaft (20), and an end cover (30), wherein the housing (10) is rotatably mounted on the central shaft (20) via a bearing (50), and the end cover (30) is hermetically mounted on an end side of the housing (10); It is characterized by: A dust ring (31) is provided between the end cover (30) and the central shaft (20); A first sealing member (77) and a second sealing member (80) are provided between the housing (10) and the central shaft (20) for sealing; the first sealing member (77) and the second sealing member (80) are located between the end cover (30) and the bearing (50), and the second sealing member (80) is located closer to the bearing (50) relative to the position of the first sealing member (77); Also includes: A fixing ring (60) is located between the first sealing member (77) and the end cover (30) and fixed to the central shaft (20); The rod group moves laterally on the fixed ring (60), and one end of the rod group can contact the first sealing member (77). Under the action of the rod group, the first sealing member (77) can be radially deformed to extend or retract, increase or decrease the contact with the central shaft (20) and the housing (10).

2. The dustproof sealing device according to claim 1, characterized in that: The rod group includes a plurality of circumferentially arranged second guide rods (72); Each second guide rod (72) is transversely threadedly mounted on the fixing ring (60), and one end acts on the first sealing member (77).

3. The dustproof sealing device according to claim 1, characterized in that: The fixing ring (60) is provided with a plurality of hole groups (75) evenly arranged in the circumferential direction; The hole group (75) has a radially arranged first hole (61) and an axially arranged second hole (62) communicating with the first hole (61); The rod group comprises: a first guide rod (71), a second guide rod (72); A first guide rod (71) is located in the first hole (61) and moves toward the axis of the central axis (20) under the elastic force of the elastic member (73); a second guide rod (72) that moves into the second hole (62) and is capable of exerting a pressing effect on the first sealing member (77); When the first guide rod (71) moves closer to or farther from the axis of the central shaft (20), the second guide rod (72) moves closer to or farther from the first sealing member (77).

4. The dustproof sealing device according to claim 3, characterized in that: One end of the first guide rod (71) close to the axis of the central axis (20) is an inclined cross-section; the second guide rod (72) is slidably located in the second hole (62), and one end facing the first guide rod (71) is an inclined cross-section and is in contact with the inclined cross-section of the first guide rod (71); Alternatively, the adjacent ends of the first guide rod (71) and the second guide rod (72) are linked via a connecting rod.

5. The dustproof sealing device according to claim 4, characterized in that: A first limiting block is provided on the first guide rod (71), and the first limiting block matches the first limiting hole in the first hole (61) so that the first guide rod (71) is circumferentially limited. A second limiting block is provided on the second guide rod (72), and the second limiting block matches the second limiting hole in the second hole (62) so that the second guide rod (72) is circumferentially limited.

6. The dustproof sealing device according to any one of claims 2 to 5, characterized in that: A pressure ring (76) is provided between the second guide rod (72) and the first sealing member (77); The top pressure ring (76) is sleeved and slidably mounted on the central shaft (20).

7. The dustproof sealing device according to claim 4, characterized in that: The first hole (61) is closed by a threaded third locking rod (74); The elastic member (73) is located between the first guide rod (71) and the third locking rod (74).

8. The dustproof sealing device according to claim 7, characterized in that: The housing (10) is provided with a threaded hole (12); The axis of the threaded hole (12) and the axis of the first hole (61) are co-located on a cross section perpendicular to the axis of the central axis (20); The threaded hole (12) is threadedly closed by a first locking rod (13).

9. The dustproof sealing device according to claim 8, characterized in that: The diameter of the threaded hole (12) is larger than the diameter of the first hole (61); The distance from the peripheral side of the fixing ring (60) to the inner wall of the housing (10) is smaller than the length of the third locking rod (74).

10. The dustproof sealing device according to claim 6, characterized in that: The housing (10) and the central shaft (20) form an inner cavity (40) for accommodating a bearing (50); A first slotted hole (21) with one end open is provided along the axis of the central axis (20), and the first slotted hole (21) is closed by a second locking rod (23) connected by a thread at the mouth; A second slot (22) is provided on the central shaft (20) and is arranged radially and connects the inner cavity (40) and the first slot (21); The housing (10) is provided with an oil nozzle (11) connected to the inner cavity (40).

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