Dustproof device for air seal of shaft end of toothed roller discharger

Abstract

The utility model belongs to tooth roll unloader sealing technical field especially is tooth roll unloader axle end air seal dustproof device, including modularization sealing main part and self -adaptation gap seal subassembly, the modularization sealing main part includes convex axle sleeve, sealing seat, air seal ring and end cover, the self -adaptation gap seal subassembly includes sealing bearing, elastic member and first sealing rubber ring, the first step hole is equipped in the sealing seat, and the inner wall on the first step hole is equipped with the first inclined plane, the first sealing rubber ring is covered and is equipped in transmission shaft, and the outer ring surface on the first sealing rubber ring is equipped with the second inclined plane with the first inclined plane cooperation, adopts the self -adaptation gap design, through the elastic force of elastic member, cooperates the inclined plane design of first step hole and first sealing rubber ring, real -time compensation transmission shaft and run, vibrate or wear and tear and produce the sealing gap, has solved the sealing failure problem that the existing sealing device gap fixed results in, has prolonged the sealing service life significantly.

Description

Technical Field

[0001] This utility model belongs to the field of sealing technology for toothed roller unloaders, and specifically relates to a dustproof air seal device for the shaft end of a toothed roller unloader. Background Technology

[0002] Toothed roller unloaders are key equipment in material conveying systems in industries such as coal, building materials, and chemicals. They are used to control the continuous unloading of materials and prevent dust from leaking out of the system. The shaft end needs to achieve a rotary seal, which must not only meet the motion requirements of the high-speed rotation of the drive shaft, but also prevent dust from entering the sealing gap and causing component wear, while avoiding environmental pollution and equipment failure caused by dust leakage.

[0003] Existing shaft end sealing technologies are mainly divided into three categories: single gas seal structures create a pressure difference by introducing gas to block dust, but the sealing gap is fixed. When the shaft moves or vibrates, the gas leakage increases and the sealing effect drops rapidly; single labyrinth seal structures use tortuous channels to block dust, but dust easily accumulates and clogs the channels. After long-term use, the sealing gap increases due to wear and the seal fails; composite structures combining gas seals and labyrinths improve the sealing effect to some extent, but still do not solve the problem of adaptive compensation of the sealing gap. After shaft movement, vibration, or long-term wear, the sealing gap cannot be restored, resulting in a short seal failure cycle, high equipment maintenance frequency, and high cost.

[0004] To solve the above problems, this utility model proposes an air-sealed dustproof device for the shaft end of a toothed roller unloader. Utility Model Content

[0005] To address the aforementioned problems in the existing technology, this utility model provides an air-sealed dustproof device for the shaft end of a toothed roller unloader, which is convenient to use, easy to assemble, and has a good sealing effect.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a toothed roller unloader shaft end air seal dustproof device, including a modular sealing body sleeved on the transmission shaft and an adaptive gap sealing component disposed within the modular sealing body;

[0007] The modular sealing body is fixed to the outer wall of the unloader housing, and a multi-stage sealing cavity is formed inside it.

[0008] The modular sealing body includes a convex bushing fixedly connected to the unloader housing, a sealing seat fixedly coaxially with the convex bushing, an air seal ring fixedly coaxially with the sealing seat, and an end cap.

[0009] The adaptive gap sealing assembly includes a sealing bearing, an elastic element, and a first sealing ring;

[0010] The sealing seat is provided with a first stepped hole, one end of the convex bushing is embedded in the first stepped hole, and the inner wall of the first stepped hole is provided with a first inclined surface;

[0011] The inner ring of the sealed bearing is keyed to the drive shaft, and the outer ring is keyed to the convex bushing.

[0012] The first sealing ring is sleeved on the drive shaft, and the outer ring surface of the first sealing ring is provided with a second inclined surface that cooperates with the first inclined surface;

[0013] The elastic element is sleeved on the sealed bearing and is located between the first sealing ring and the convex bushing.

[0014] As a preferred embodiment of this utility model, the elastic element is at least one of a spring, a disc spring, an elastic rubber body, or a metal elastic sheet.

[0015] As a preferred technical solution of this utility model, it also includes an auxiliary sealing component, and the auxiliary sealing component includes a first U-shaped rubber ring;

[0016] The sealing seat has a second stepped hole at one end facing the air seal ring, and the first U-shaped rubber ring is sleeved on the drive shaft and located in the second stepped hole;

[0017] The first U-shaped rubber ring has an annular guide groove at one end facing the air seal ring, and the inner side of the annular guide groove has a third inclined surface.

[0018] As a preferred embodiment of this utility model, the auxiliary sealing assembly further includes a second sealing ring;

[0019] The second sealing ring is fitted onto the drive shaft and located inside the sealing seat.

[0020] As a preferred embodiment of this utility model, a third sealing ring is also included;

[0021] The third sealing ring is located between the contact surfaces of the sealing seat and the convex bushing.

[0022] As a preferred embodiment of this utility model, a second U-shaped rubber ring is also included;

[0023] The second U-shaped rubber ring is located between the contact surface of the convex bushing and the unloader housing.

[0024] As a preferred technical solution of this utility model, it also includes a positioning screw and a locking nut;

[0025] Multiple positioning screws are fixed at equal intervals along the circumferential direction on the convex bushing, and positioning holes are provided on the sealing seat for the positioning screws to pass through;

[0026] The locking nut is attached to the protruding end of the positioning screw by means of thread engagement.

[0027] As a preferred embodiment of this utility model, it also includes a locking bolt;

[0028] The locking bolts are evenly spaced along the circumference and are threadedly connected to the sealing seat after passing through the end cap and the air seal ring.

[0029] Compared with the prior art, the beneficial effects of this utility model are:

[0030] 1. Adopting an adaptive clearance design, the elastic force of the elastic element, combined with the inclined surface design of the first stepped hole and the first sealing ring, compensates in real time for the sealing clearance caused by the drive shaft movement, vibration or wear, solving the sealing failure problem caused by the fixed clearance of the existing sealing device and significantly extending the service life of the seal.

[0031] 2. The modular structure design allows for the detachable connection of all components of the sealing body, making assembly, maintenance, and replacement convenient and reducing the difficulty and cost of equipment maintenance.

[0032] 3. It adopts a multi-stage collaborative sealing design, with adaptive gap sealing components and air seals working together, combined with end face auxiliary sealing, to form multiple sealing barriers. The sealing effect is stable and reliable, and it is suitable for harsh working conditions with high dust and high vibration.

[0033] Other additional advantages and beneficial effects of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this invention. Attached Figure Description

[0034] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0035] Figure 1 This is a schematic diagram of the structure of this utility model;

[0036] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0037] Figure 3 This utility model Figure 2 A magnified schematic diagram of the primary sealing assembly in the diagram;

[0038] Figure 4This utility model Figure 2 A magnified schematic diagram of the secondary sealing assembly in the middle;

[0039] Figure 5 This utility model Figure 2 Enlarged structural diagram at point A in the diagram;

[0040] Figure 6 This utility model Figure 2 A magnified structural diagram at point B in the diagram.

[0041] In the diagram: 1. Unloader housing; 2. Drive shaft; 3. Modular sealing body; 31. Convex bushing; 32. Sealing seat; 321. Positioning hole; 322. First stepped hole; 3221. First inclined surface; 323. Second stepped hole; 33. Air seal ring; 34. End cover; 4. Positioning screw; 5. Locking nut; 6. Locking bolt; 7. Adaptive gap sealing assembly; 71. Sealing bearing; 72. Elastic element; 73. First sealing ring; 731. Second inclined surface; 8. Auxiliary sealing assembly; 81. First U-shaped ring; 811. Annular guide groove; 812. Third inclined surface; 82. Second sealing ring; 9. Third sealing ring; 10. Second U-shaped ring. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] Please see Figures 1-6 The present invention provides the following technical solution: a toothed roller unloader shaft end air seal dustproof device, including a modular sealing body 3 sleeved on the transmission shaft 2 and an adaptive gap sealing component 7 disposed in the modular sealing body 3.

[0044] Furthermore, by Figures 1-3As shown, in this embodiment, the modular sealing body 3 is fixed to the outer wall of the unloader housing 1, and a multi-stage sealing cavity is formed inside it; the modular sealing body 3 includes a convex bushing 31 fixedly connected to the unloader housing 1, a sealing seat 32 coaxially fixed to the convex bushing 31, an air seal ring 33 coaxially fixed to the sealing seat 32, and an end cap 34; the adaptive gap sealing assembly 7 includes a sealing bearing 71, an elastic element 72, and a first sealing rubber ring 73; the sealing seat 32 is provided with a first stepped hole 322, one end of the convex bushing 31 is embedded in the first stepped hole 322, and the inner wall of the first stepped hole 322 is provided with The first inclined surface 3221; the inner ring of the sealed bearing 71 is keyed to the drive shaft 2, and the outer ring is keyed to the convex bushing 31; the first sealing ring 73 is sleeved on the drive shaft 2, and the outer ring surface of the first sealing ring 73 is provided with a second inclined surface 731 that cooperates with the first inclined surface 3221; the elastic element 72 is sleeved on the sealed bearing 71 and is located between the first sealing ring 73 and the convex bushing 31. After adopting the above scheme, when the device is assembled, the modular sealing body 3 is fixed to the outer wall of the unloader housing 1 through the convex bushing 31, so as to realize the rigid connection between the sealing system and the unloader housing 1.

[0045] The drive shaft 2 passes through the interior of the modular sealing body 3. The inner ring of the sealing bearing 71 in the adaptive gap sealing assembly 7 is keyed to the drive shaft 2, and the outer ring is keyed to the convex bushing 31. This provides radial support for the drive shaft 2 to limit its radial runout, and the keyed connection ensures the synchronous rotational compatibility between the drive shaft 2 and the modular sealing body 3. At the same time, the elastic element 72 is in a pre-compressed state, and its axial elastic force acts on the first sealing ring 73, pushing the first sealing ring 73 to approach the sealing seat 32 along the axial direction of the drive shaft 2. This causes the second inclined surface 731 of the outer ring surface of the first sealing ring 73 to fit tightly with the first inclined surface 3221 of the inner wall of the first stepped hole 322 of the sealing seat 32, forming an initial radial sealing surface and blocking the basic channel for dust in the unloader housing 1 to leak outward along the shaft end gap.

[0046] When the toothed roller unloader is working, the drive shaft 2 drives the toothed roller to rotate to achieve the unloading action. The sealed bearing 71 rotates synchronously with the drive shaft 2 (the inner ring rotates with the shaft, and the outer ring is stationary relative to the convex bushing 31). Its rolling friction structure can reduce the running resistance of the drive shaft 2, and at the same time avoid the friction loss caused by the rotation of the drive shaft 2 from damaging the sealing structure. During this process, the first sealing ring 73 maintains radial sealing contact with the sealing seat 32 through the contact surface of the second inclined surface 731 and the first inclined surface 3221. Moreover, because the inclined surface mating structure has the "self-centering" characteristic, it can initially correct the slight radial offset generated during the operation of the drive shaft 2, and reduce the instantaneous change of the sealing gap.

[0047] During long-term use, if the following situations occur: the contact surface between the first sealing ring 73 and the first inclined surface 3221 wears due to friction, resulting in an increase in the sealing gap; the radial runout of the drive shaft 2 increases due to load fluctuations or bearing wear; the sealing assembly undergoes thermal expansion and contraction deformation due to temperature changes, then the elastic element 72 will continuously apply axial preload to the first sealing ring 73 based on its own elastic reset characteristics, pushing the first sealing ring 73 to move slightly along the axial direction of the drive shaft 2, so that the second inclined surface 731 always fits tightly against the first inclined surface 3221, automatically compensating for the sealing gap caused by wear or deformation, ensuring the continuity and reliability of the radial seal, and realizing the "adaptive gap sealing" function.

[0048] In addition, due to the contact between the first inclined surface 3221 and the second inclined surface 731, when the elastic element 72 applies an axial preload to the first sealing ring 73, the inclined surface will generate a radial component force, which will reduce the sealing gap between the first sealing ring 73 and the drive shaft 2 and ensure the sealing performance.

[0049] The air seal ring 33 cooperates with the end cover 34 to form a multi-stage sealing cavity inside the modular sealing body 3 (the convex bushing 31, sealing seat 32, air seal ring 33, and end cover 34 enclose an independent air seal cavity). During operation, compressed air at a preset pressure (such as 0.2-0.4MPa) is introduced into the air inlet channel of the air seal ring 33. The compressed air forms a uniformly distributed positive pressure air curtain in the multi-stage sealing cavity. The positive pressure airflow permeates bidirectionally into the inside and outside of the unloader housing 1 along the sealing gap, preventing dust inside the unloader housing 1 from migrating to the shaft end sealing area, while blocking external impurities from entering the sealing cavity.

[0050] Optionally, by Figures 1-3 As shown in this embodiment, the elastic element 72 is at least one of a spring, a disc spring, an elastic rubber body, or a metal elastic sheet. With the above solution, the spring can provide a stable linear preload force during use, which is suitable for large stroke sealing gap compensation scenarios; the disc spring can still output sufficient preload force under the condition of compact axial space, which meets the installation requirements of miniaturized unloaders; the elastic rubber body has both elasticity and shock absorption characteristics, which can buffer the radial impact when the drive shaft 2 is running and reduce the wear of the sealing surface; the metal elastic sheet has excellent high and low temperature resistance and anti-aging performance, which is suitable for long-term use under harsh working conditions.

[0051] The optional design of multiple elastic elements can be adapted to toothed roller unloaders of different specifications and working environments. By using a single type or multiple combinations, the sealing pre-tightening force requirements can be accurately matched to ensure the reliable fit between the first sealing ring 73 and the first inclined surface 3221. At the same time, all kinds of elastic elements 72 are mature and universal parts, which are convenient to purchase and have low replacement costs, thereby reducing the production and maintenance costs of the device and enhancing the market competitiveness of the product.

[0052] Preferably, by Figure 1 , Figure 2 and Figure 4 As shown, this embodiment also includes an auxiliary sealing component 8, which includes a first U-shaped rubber ring 81; a second stepped hole 323 is provided at one end of the sealing seat 32 facing the air seal ring 33, the first U-shaped rubber ring 81 is sleeved on the drive shaft 2 and located in the second stepped hole 323; an annular guide groove 811 is provided at one end of the first U-shaped rubber ring 81 facing the air seal ring 33, and a third inclined surface 812 is provided on the inner side of the annular guide groove 811. With the above solution, when the compressed air introduced into the air seal ring 33 diffuses in the multi-stage sealing cavity during use, part of the airflow will enter the area of ​​the second stepped hole 323 along the gap between the sealing seat 32 and the air seal ring 33, and be accurately guided into the annular guide groove 811 of the first U-shaped rubber ring 81.

[0053] The annular guide groove 811 serves as an airflow buffer and distribution structure, enabling compressed air to form a uniformly distributed radial air pressure within the groove. When this air pressure acts on the third inclined surface 812, based on the force decomposition characteristics of the inclined surface, a radial component force pointing towards the axis of the drive shaft 2 and a preload force along the axial direction will be generated. The radial component force forces the inner lip of the first U-shaped rubber ring 81 to tightly adhere to the outer circumferential surface of the drive shaft 2, while the axial preload force pushes its outer wall to tightly adhere to the inner wall of the second stepped hole 323. Thus, by means of the air pressure self-tightening effect, a bidirectional contact seal of "inner shaft and outer hole" is formed, blocking the path of dust to penetrate towards the air seal ring 33 along the shaft end gap.

[0054] Meanwhile, the U-shaped cross-section structure of the first U-shaped rubber ring 81 has a natural elastic compensation capability, which can adapt to the slight radial runout or axial movement of the transmission shaft 2, ensuring that the sealing surface always maintains effective contact during the dynamic operation of the transmission shaft 2; the annular guide groove 811 can also form a "throttling and pressure reduction" effect on the airflow, so that the airflow entering the area diffuses to the outside at a low pressure after the sealing reinforcement is completed, which not only avoids excessive impact of high pressure airflow causing wear of parts, but also continuously provides a weak positive pressure in the direction of the outer end cover 34, further enhancing the overall dustproof effect.

[0055] Preferably, by Figure 1 , Figure 2 and Figure 4As shown in this embodiment, the auxiliary sealing assembly 8 also includes a second sealing ring 82. The second sealing ring 82 is sleeved on the drive shaft 2 and located inside the sealing seat 32. With the above solution, in use, the second sealing ring 82 is sleeved on the drive shaft 2 and located inside the sealing seat 32, constructing an "intermediate interception defense line" between the adaptive gap sealing assembly 7 and the first U-shaped ring 81. Even if the preceding seal has a slight gap due to wear or fluctuations in operating conditions, causing some dust or airflow to break through the initial seal, the second sealing ring 82 can directly block the leakage path through its tight fit with the outer peripheral surface of the drive shaft 2 and the inner wall of the sealing seat 32, forming a "multi-level progressive sealing barrier", significantly reducing the risk of dust overflow from the shaft end and improving the overall sealing reliability.

[0056] When the positive pressure airflow introduced by the air sealing ring 33 diffuses in the sealing seat 32, the second sealing ring 82 can act as an "airflow buffer structure" to reduce the direct impact of the airflow on the first sealing ring 73 and prevent the high pressure airflow from causing local separation between the first sealing ring 73 and the first inclined surface 3221.

[0057] Preferably, by Figure 1 , Figure 2 and Figure 5 As shown, this embodiment also includes a third sealing ring 9; the third sealing ring 9 is located between the contact surface of the sealing seat 32 and the convex bushing 31. After adopting the above solution, during use, the contact surface formed by the assembly of the sealing seat 32 and the convex bushing 31 is prone to micro gaps due to the influence of machining accuracy and assembly pressure. These gaps are potential channels for dust penetration.

[0058] The third sealing ring 9 is embedded between the contact surfaces of the two. It can completely fill such gaps by its own elastic deformation, forming a "radial sealing defense line" to block the path of dust from the assembly gap between the sealing seat 32 and the convex bushing 31 into the interior of the modular sealing body 3. Together with the adaptive gap sealing component 7 and the auxiliary sealing component 8, it forms a full-dimensional sealing system and eliminates sealing blind spots.

[0059] During device assembly, there may be slight deviations in the coaxiality and fit of the sealing seat 32 and the convex bushing 31. During long-term operation, due to temperature fluctuations and vibration loads, the contact surfaces of the two may also experience slight deformation or displacement. The elastic characteristics of the third sealing ring 9 can adaptively compensate for the above deviations and deformations, always maintaining a tight fit with the contact surface, avoiding the increase in gap due to relative displacement of components, ensuring long-term stable sealing effect of the contact surface, and maintaining sealing performance without frequent adjustment of assembly precision.

[0060] Preferably, by Figure 1 , Figure 2 and Figure 6As shown, this embodiment also includes a second U-shaped rubber ring 10; the second U-shaped rubber ring 10 is located between the contact surface of the convex bushing 31 and the unloader housing 1. After adopting the above solution, if there is an assembly gap between the contact surface of the convex bushing 31 and the unloader housing 1 during use, dust in the unloader housing 1 can easily seep into the interior of the modular sealing body 3 along the gap, contaminating the core components such as the sealing bearing 71 and the elastic element 72, and causing air pressure leakage in the airtight cavity.

[0061] After the second U-shaped rubber ring 10 is embedded in the contact surface of the two, its U-shaped cross section can completely fill the gap through elastic deformation, forming a "radial + axial" bidirectional seal. In the radial direction, it fits tightly against the side wall of the contact surface, blocking the lateral penetration of dust; in the axial direction, it relies on the pre-tightening force of the U-shaped structure to maintain continuous contact with the contact surface, eliminating the sealing blind spot at the connection between the convex bushing 31 and the unloader housing 1.

[0062] In actual assembly, there may be slight deviations in the coaxiality and fit between the convex bushing 31 and the unloader housing 1; when the unloader is working, the unloader housing 1 is prone to slight deformation due to material impact and temperature fluctuations, which may lead to changes in the gap between the contact surfaces.

[0063] The elastic properties of the second U-shaped rubber ring 10 and the U-shaped cross-section structure form a dual fit: on the one hand, the elastic material can adaptively compress or stretch with the gap change, avoiding sealing failure due to deviation; on the other hand, the U-shaped structure can open to both sides when under force, increasing the contact area with the contact surface. Even if the convex bushing 31 or the unloader housing 1 has a small displacement, it can still maintain effective sealing contact. Long-term sealing stability can be guaranteed without frequent adjustment of assembly accuracy, reducing the risk of sealing failure caused by assembly error or working condition fluctuation.

[0064] Optionally, by Figure 1 and Figure 2As shown, this embodiment also includes positioning screws 4 and locking nuts 5; multiple positioning screws 4 are fixed at equal intervals along the circumferential direction on the convex bushing 31, and positioning holes 321 for the positioning screws 4 to pass through are provided on the sealing seat 32; the locking nuts 5 are provided on the protruding end of the positioning screws 4 by thread engagement. With the above scheme, during use, when assembling the device, multiple positioning screws 4 are first fixed at equal intervals along the circumferential direction of the convex bushing 31 (e.g., by welding or threaded connection) to ensure that the axis of each screw is parallel to the axis of the convex bushing 31 and the radial spacing is consistent; then the sealing seat 32 is... The positioning hole 321 of 2 is aligned with the positioning screw 4 and fitted, so that the positioning screw 4 passes through the positioning hole 321. The positioning screws 4, which are evenly distributed, form a "multi-point radial constraint" on the sealing seat 32 through their cooperation with the positioning hole 321. This forces the sealing seat 32 and the convex bushing 31 to remain coaxial, avoiding the offset of their axes due to misalignment during assembly. This lays the foundation for the precise fitting of subsequent sealing components (such as the third sealing ring 9 and the first sealing ring 73). At the same time, it achieves the initial pre-fixation of the convex bushing 31 and the sealing seat 32, preventing component misalignment during the subsequent assembly locking stage.

[0065] After pre-positioning is completed, the locking nut 5 is screwed onto the extended end of the positioning screw 4. By tightening the locking nut 5, an axial preload is applied. This preload is transmitted along the positioning screw 4 to the contact surface between the convex bushing 31 and the sealing seat 32, forcing them to fit tightly together. On the one hand, this compresses the third sealing ring 9 located between the contact surfaces, allowing it to fully deform elastically to fill the micro gaps between the contact surfaces and enhance the sealing effect between the components. On the other hand, it eliminates the axial gap after the convex bushing 31 and the sealing seat 32 are assembled, preventing axial movement caused by vibration during device operation. This ensures that the first inclined surface 3221 of the inner wall of the first stepped hole 322 and the second inclined surface 731 of the first sealing ring 73 always maintain a stable contact pressure, providing axial positioning assurance for the reliable operation of the adaptive gap sealing assembly 7.

[0066] Optionally, by Figure 1 and Figure 2As shown, this embodiment also includes locking bolts 6; multiple locking bolts 6 are evenly spaced along the circumference. The locking bolts 6 penetrate the end cover 34 and the air seal ring 33, and then are threadedly screwed into the sealing seat 32. With this scheme, during device assembly, multiple locking bolts 6 are evenly spaced along the circumference, sequentially penetrating the bolt holes of the end cover 34 and the corresponding through holes of the air seal ring 33, and then screwed into the pre-set threaded holes of the sealing seat 32. The evenly spaced locking bolt layout can form a "circumferential uniform constraint" on the end cover 34 and the air seal ring 33, forcing all three to be based on the axis of the drive shaft 2. To ensure coaxial alignment, avoid misalignment during assembly, which could lead to eccentric gaps between the air seal ring 33 and the sealing seat 32 and end cover 34. As the locking bolts 6 are gradually tightened, their axial preload will push the end cover 34 and air seal ring 33 to fit tightly against the sealing seat 32, so that the two sides of the air seal ring 33 form sealing surfaces with the end face of the sealing seat 32 and the inner wall of the end cover 34, respectively. At the same time, the mating surfaces of the end cover 34 and the air seal ring 33 are also compacted, ultimately forming a complete and leak-free multi-stage air seal cavity, providing a sealed space foundation for the stable retention of compressed air and the formation of an air curtain.

[0067] Components not described in detail in this article are existing technologies.

[0068] The working principle and usage process of this utility model: When the toothed roller unloader shaft end air seal dustproof device of this utility model is used, after the device is assembled, the modular sealing body 3 is fixed to the outer wall of the unloader housing 1 through the convex bushing 31, so as to realize the rigid connection between the sealing system and the unloader housing 1.

[0069] The drive shaft 2 passes through the interior of the modular sealing body 3. The inner ring of the sealing bearing 71 in the adaptive clearance sealing assembly 7 is keyed to the drive shaft 2, and the outer ring is keyed to the convex bushing 31. This provides radial support for the drive shaft 2 to limit its radial runout, and the keyed connection ensures the synchronous rotation compatibility between the drive shaft 2 and the modular sealing body 3.

[0070] At the same time, the elastic element 72 is in a pre-compressed state, and its axial elastic force acts on the first sealing ring 73, pushing the first sealing ring 73 to approach the sealing seat 32 along the axial direction of the transmission shaft 2, so that the second inclined surface 731 of the outer ring surface of the first sealing ring 73 is tightly fitted with the first inclined surface 3221 of the inner wall of the first stepped hole 322 of the sealing seat 32, forming an initial radial sealing surface, blocking the basic channel for dust in the unloader housing 1 to leak outward along the shaft end gap;

[0071] When the toothed roller unloader is working, the drive shaft 2 drives the toothed roller to rotate to achieve the unloading action. The sealed bearing 71 rotates synchronously with the drive shaft 2 (the inner ring rotates with the shaft, and the outer ring is stationary relative to the convex bushing 31). Its rolling friction structure can reduce the running resistance of the drive shaft 2, and at the same time avoid the friction loss caused by the rotation of the drive shaft 2 from damaging the sealing structure.

[0072] During this process, the first sealing ring 73 maintains radial sealing contact with the sealing seat 32 through the contact surface of the second inclined surface 731 and the first inclined surface 3221. Furthermore, due to the "self-centering" characteristic of the inclined surface mating structure, it can initially correct the slight radial offset generated during the operation of the transmission shaft 2, thereby reducing the instantaneous change in the sealing gap.

[0073] During long-term use, if the following situations occur: the contact surface between the first sealing ring 73 and the first inclined surface 3221 wears due to friction, resulting in an increase in the sealing gap; the radial runout of the drive shaft 2 increases due to load fluctuations or bearing wear; the sealing assembly undergoes thermal expansion and contraction deformation due to temperature changes, at this time, the elastic element 72 will continuously apply axial preload to the first sealing ring 73 based on its own elastic reset characteristics, pushing the first sealing ring 73 to move slightly along the axial direction of the drive shaft 2, so that the second inclined surface 731 always fits tightly against the first inclined surface 3221, automatically compensating for the sealing gap caused by wear or deformation, ensuring the continuity and reliability of the radial seal, and realizing the "adaptive gap sealing" function;

[0074] In addition, due to the contact between the first inclined surface 3221 and the second inclined surface 731, when the elastic element 72 applies an axial preload to the first sealing ring 73, the inclined surface will generate a radial component force, which will reduce the sealing gap between the first sealing ring 73 and the drive shaft 2 and further ensure the sealing performance.

[0075] The air seal ring 33 and the end cover 34 cooperate to form a multi-level sealing cavity inside the modular sealing body 3 (the convex bushing 31, sealing seat 32, air seal ring 33, and end cover 34 enclose an independent air seal cavity).

[0076] During operation, compressed air at a preset pressure (such as 0.2-0.4MPa) is introduced into the air inlet channel of the air seal ring 33. The compressed air forms a uniformly distributed positive pressure air curtain in the multi-stage sealing cavity. The positive pressure airflow permeates bidirectionally into the inside and outside of the unloader housing 1 along the sealing gap, preventing dust in the unloader housing 1 from migrating to the shaft end sealing area, while blocking external impurities from entering the sealing cavity.

[0077] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A toothed roller unloader shaft end air-sealed dustproof device, characterized in that: It includes a modular sealing body (3) sleeved on the drive shaft (2) and an adaptive gap sealing assembly (7) disposed within the modular sealing body (3); The modular sealing body (3) is fixed to the outer wall of the unloader housing (1), and a multi-level sealing cavity is formed inside it; The modular sealing body (3) includes a convex bushing (31) fixedly connected to the unloader housing (1), a sealing seat (32) fixed coaxially with the convex bushing (31), an air seal ring (33) fixed coaxially with the sealing seat (32), and an end cap (34). The adaptive gap sealing assembly (7) includes a sealing bearing (71), an elastic element (72), and a first sealing ring (73). The sealing seat (32) is provided with a first stepped hole (322), one end of the convex bushing (31) is embedded in the first stepped hole (322), and the inner wall of the first stepped hole (322) is provided with a first inclined surface (3221). The inner ring of the sealed bearing (71) is keyed to the transmission shaft (2), and the outer ring is keyed to the convex bushing (31); The first sealing ring (73) is sleeved on the transmission shaft (2), and the outer ring surface of the first sealing ring (73) is provided with a second inclined surface (731) that cooperates with the first inclined surface (3221). The elastic element (72) is sleeved on the sealed bearing (71) and located between the first sealing ring (73) and the convex bushing (31).

2. The air-tight dustproof device for the shaft end of the toothed roller unloader according to claim 1, characterized in that: The elastic element (72) is at least one of a spring, disc spring, elastic rubber body or metal elastic sheet.

3. The air-sealed dustproof device at the shaft end of the toothed roller unloader according to claim 1, characterized in that: It also includes an auxiliary sealing assembly (8), and the auxiliary sealing assembly (8) includes a first U-shaped rubber ring (81). The sealing seat (32) has a second stepped hole (323) at one end facing the air seal ring (33), and the first U-shaped rubber ring (81) is sleeved on the transmission shaft (2) and located in the second stepped hole (323); The first U-shaped rubber ring (81) has an annular guide groove (811) at one end facing the air seal ring (33), and the inner side of the annular guide groove (811) has a third inclined surface (812).

4. The air-sealed dustproof device at the shaft end of the toothed roller unloader according to claim 3, characterized in that: The auxiliary sealing assembly (8) also includes a second sealing ring (82). The second sealing ring (82) is fitted on the drive shaft (2) and located inside the sealing seat (32).

5. The air-sealed dustproof device at the shaft end of the toothed roller unloader according to claim 1, characterized in that: It also includes a third sealing ring (9); The third sealing ring (9) is located between the contact surfaces of the sealing seat (32) and the convex bushing (31).

6. The air-sealed dustproof device at the shaft end of the toothed roller unloader according to claim 1, characterized in that: It also includes a second U-shaped rubber ring (10); The second U-shaped rubber ring (10) is located between the contact surface of the convex bushing (31) and the unloader housing (1).

7. The air-tight dustproof device for the shaft end of the toothed roller unloader according to claim 1, characterized in that: It also includes a positioning screw (4) and a locking nut (5); Multiple positioning screws (4) are fixed at equal intervals along the circumferential direction on the convex bushing (31), and a positioning hole (321) is provided on the sealing seat (32) for the positioning screws (4) to pass through. The locking nut (5) is provided at the protruding end of the positioning screw (4) by means of thread engagement.

8. The air-sealed dustproof device at the shaft end of the toothed roller unloader according to claim 1, characterized in that: It also includes a locking bolt (6); Multiple locking bolts (6) are evenly spaced along the circumference. The locking bolts (6) pass through the end cap (34) and the air seal ring (33) and are then threadedly connected to the sealing seat (32).

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