Cavity sealing structure for a crusher

Abstract

The utility model relates to coal ore crushing technical field, the utility model provides a cavity sealing structure for crusher for setting on the main shaft of crusher, and sealing structure includes the spiral shaft sleeve of setting on the main shaft and the baffle of setting on the spiral shaft sleeve, is equipped with the tooth disc on the main shaft, and one end of spiral shaft sleeve abuts on the end face of tooth disc, and the outer peripheral wall of spiral shaft sleeve has spiral turbulence groove, and the rotation direction of turbulence groove is same with the rotation direction of main shaft, and all are clockwise or all are counterclockwise. The sealing structure provided by the utility model, through the abutment structure of spiral shaft sleeve and tooth disc, realizes the basis of axial sealing, directly blocks the main path of dust penetration along the axial direction, solves the technical problem that the high pressure dust in the crushing cavity in the prior art is easy to overflow from the cooperation place of main shaft and baffle.

Description

Technical Field

[0001] This utility model relates to the field of coal and ore crushing technology, specifically to a cavity sealing structure for a crusher. Background Technology

[0002] The core structure of a toothed roller crusher consists of two opposing rotating toothed rollers, through which material is crushed by compression. To facilitate adjustment of the distance between the two rollers, the crusher baffle uses a U-shaped hole and is sealed with a rubber plate. However, this cavity sealing structure suffers from technical defects such as low manufacturing precision and poor dust sealing ability. During the material crushing process, high-pressure dust within the crushing chamber easily escapes from the joints between the rollers and the baffles, contaminating the bearing housing or gearbox lubrication system, leading to abnormal wear of critical components such as bearings and gears, and even endangering operator health and impacting environmental quality. Utility Model Content

[0003] To overcome the above-mentioned defects, the embodiments of this utility model provide a cavity sealing structure for a crusher, which solves the technical problem in the prior art that high-pressure dust in the crushing cavity easily overflows from the joint between the main shaft and the baffle.

[0004] According to one aspect, at least one embodiment of the present invention provides a cavity sealing structure for a crusher, for being installed on the main shaft of the crusher. The sealing structure includes a spiral sleeve sleeved on the main shaft and a baffle sleeved on the spiral sleeve. A toothed disc is provided on the main shaft. One end of the spiral sleeve abuts against the end face of the toothed disc. The outer peripheral wall of the spiral sleeve has a spiral turbulence groove. The rotation direction of the turbulence groove is the same as the rotation direction of the main shaft, both being clockwise or both being counterclockwise.

[0005] As a further technical solution, the spiral bushing includes a connected cylindrical section and a frustum section, the turbulence groove is located on the outer peripheral wall of the frustum section, the frustum section has a large diameter end and a small diameter end, the cylindrical section is connected to the large diameter end, and the small diameter end abuts against the toothed disc.

[0006] As a further technical solution, it also includes a rubber plate sleeved on the cylindrical section, the rubber plate being located on the side of the baffle away from the toothed disc, and the rubber plate abutting against the baffle.

[0007] As a further technical solution, it also includes fasteners and a pressure cap sleeved on the cylindrical section, the pressure cap abutting against the rubber plate, and the pressure cap, the rubber plate and the baffle are fixed by the fasteners.

[0008] As a further technical solution, the inner peripheral wall of the gland has an annular groove, and a sealing ring is embedded in the annular groove, and the sealing ring is sleeved on the cylindrical section.

[0009] As a further technical solution, the annular groove also has an oil storage groove on its peripheral wall, and the side wall of the pressure cap is also provided with an oil cup that flows into the oil storage groove.

[0010] As a further technical solution, it also includes a retaining ring on the main shaft, the retaining ring abutting against the end of the spiral sleeve away from the gear disk, the retaining ring being used to lock the axial position of the spiral sleeve.

[0011] As a further technical solution, the taper of the frustum section is 1:8 to 1:15.

[0012] As a further technical solution, the pitch of the turbulence groove is 5-20mm.

[0013] As a further technical solution, the lead of the turbulence groove is 30-60 mm.

[0014] The beneficial effects of this utility model are as follows: In this invention, the abutment structure between the spiral bushing and the gear disc achieves the basic principle of axial sealing, directly blocking the main path of dust penetration along the axial direction; the design of the turbulence groove and the main shaft rotation are consistent, and the active reverse thrust is generated by the rotation of the main shaft to achieve active interception and diversion of dust, changing the traditional passive blocking mode of sealing and improving the protection capability against high-pressure dust. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0016] Figure 1 This is a cross-sectional view of a sealing structure installed on the main shaft and cooperating with the gear plate in one embodiment of the present invention. Figure 2 for Figure 1 An enlarged structural diagram of part A in the embodiment; Figure 3 This is a schematic diagram of the spiral bushing in another embodiment of the present invention; Figure 4 This is a schematic diagram of the mating structure of the spiral bushing, main shaft, and gear disk in another embodiment of the present invention; In the diagram: 1. Main shaft, 2. Spiral bushing, 21. Cylindrical section, 22. Frustum section, 221. Turbulence groove, 222. Large diameter end, 223. Small diameter end, 3. Baffle, 4. Gear disc, 5. Rubber plate, 6. Fastener, 7. Pressure cap, 71. Annular groove, 711. Oil reservoir, 8. Sealing ring, 9. Oil cup, 10. Snap ring. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0018] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0019] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] The crusher cavity sealing structure provided in this embodiment is mainly applied to toothed roller crushers in the field of coal and ore crushing, and is used to solve the problem of high-pressure dust overflowing from the cavity during the crushing process. The core working principle of a toothed roller crusher is to crush materials by squeezing them with two relatively rotating toothed rollers. To adapt to the adjustment requirements of the toothed roller spacing, traditional crusher baffles often use a U-shaped hole combined with a rubber plate for sealing. However, this structure has defects such as low manufacturing precision and poor dust sealing ability, which makes it easy for high-pressure dust to overflow from the mating point between the main shaft and the baffle, thereby contaminating the lubrication system, wearing critical components, and affecting environmental protection and the health of operators. This sealing structure, through optimized mechanical structure design, constructs a multi-layer protection system, effectively making up for the shortcomings of traditional structures.

[0024] like Figure 1 The diagram shows the fitting structure of the sealing structure with the main shaft 1 and the gear disc 4 in one embodiment of the present invention. The sealing structure is integrally assembled on the main shaft 1 of the crusher. The gear disc 4 is fixedly mounted on the main shaft 1 and rotates synchronously with the main shaft 1 to achieve material crushing. The core components of the sealing structure include a spiral sleeve 2 and a baffle 3. The spiral sleeve 2 is coaxially sleeved on the outer periphery of the main shaft 1, and one end face of the spiral sleeve 2 directly abuts against the end face of the gear disc 4, forming a tight axial fit, thereby blocking the path of dust penetrating from between the gear disc 4 and the spiral sleeve 2 along the axial direction of the main shaft 1. The baffle 3 is coaxially sleeved on the outer periphery of the spiral sleeve 2, forming a radial enclosure of the spiral sleeve 2 and limiting the diffusion space of dust. A rubber plate 5 and a pressure cap 7 are sequentially sleeved on the outer periphery of the cylindrical section 21. The rubber plate 5 is located on the side of the baffle 3 away from the gear disc 4, and one end face of the rubber plate 5 abuts against the end face of the baffle 3, forming an axial elastic sealing barrier. One end face of the pressure cover 7 abuts against the end face of the rubber plate 5 away from the baffle 3. The pressure cover 7, the rubber plate 5 and the baffle 3 are fixedly connected as a whole by fasteners 6 passing through the pressure cover 7, the rubber plate 5 and the baffle 3, so that the pressure cover 7 generates continuous axial pressure on the rubber plate 5, ensuring that the rubber plate 5 is always in close contact with the baffle 3, and adapting to slight vibrations or assembly errors during equipment operation.

[0025] Furthermore, such as Figure 3As shown, the spiral bushing 2 is composed of an integrally formed cylindrical section 21 and a frustum-shaped section 22, which are coaxially arranged and fixedly connected. The frustum-shaped section 22 has a larger diameter end 222 and a smaller diameter end 223. One end of the cylindrical section 21 is fixedly connected to the end face of the larger diameter end 222 of the frustum-shaped section 22, and the end face of the smaller diameter end 223 of the frustum-shaped section 22 abuts against the end face of the gear disk 4. This conical structure can provide directional guidance for dust moving in the gap. The spiral-shaped turbulence groove 221 is integrally formed on the outer circumference of the frustum-shaped section 22. The rotation direction of the turbulence groove 221 is consistent with the rotation direction of the main shaft 1. That is, when the main shaft 1 rotates clockwise, the turbulence groove 221 rotates clockwise, and when the main shaft 1 rotates counterclockwise, the turbulence groove 221 rotates counterclockwise. The spiral force generated by the rotation achieves the reverse pushing of dust.

[0026] like Figure 4 The diagram shows the assembly structure of the spiral sleeve 2, main shaft 1, and gear disc 4. The two slanted arrows on the left represent the direction of dust impact, while the vortex-shaped arrow on the right represents the rotation direction of the main shaft 1. The spiral sleeve 2 and main shaft 1 are interference-fitted or keyed, ensuring that the main shaft 1 rotates synchronously with the spiral sleeve 2. The small-diameter end 223 of the frustum section 22 abuts against the end face of the gear disc 4 using a surface contact method, increasing the sealing contact area and reducing the possibility of dust seeping through gaps in the contact surface. Simultaneously, a retaining ring 10 is mounted on the main shaft 1, abutting against the end of the spiral sleeve 2 furthest from the gear disc 4. Through a fixed fit with the main shaft 1, the axial position of the spiral sleeve 2 is locked, preventing displacement due to vibration or dust impact during equipment operation and ensuring a stable contact state with the gear disc 4.

[0027] like Figure 1 Combination Figure 2 As shown, Figure 2 for Figure 1 The enlarged view of section A in the image shows the auxiliary sealing components of the sealing structure. Optionally, an annular groove 71 is formed on the inner peripheral wall of the gland 7. The annular groove 71 is continuously arranged along the circumference of the gland 7. The sealing ring 8 is coaxially embedded in the annular groove 71. The inner peripheral surface of the sealing ring 8 is tightly fitted with the outer peripheral surface of the cylindrical segment 21 to form a radial elastic sealing barrier. An oil storage groove 711 is also formed on the peripheral wall of the annular groove 71. The oil storage groove 711 is connected to the annular groove 71. An oil cup 9 is installed on the side wall of the gland 7. The oil outlet of the oil cup 9 is connected to the oil storage groove 711. Lubricating oil can be injected into the oil storage groove 711 through the oil cup 9. The lubricating oil diffuses in the oil storage groove 711 and wets the mating surface of the sealing ring 8 and the cylindrical segment 21 to form a continuous oil film.

[0028] After the crusher starts, the main shaft 1 drives the toothed disc 4 and the spiral sleeve 2 to rotate synchronously. The high-pressure dust generated in the crushing chamber moves towards the gap between the main shaft 1 and the baffle 3, first contacting the conical outer circumference of the frustum section 22. The conical structure of the frustum section 22 provides directional guidance for the dust, causing it to move along the conical surface towards the turbulence groove 221. Since the rotation direction of the turbulence groove 221 is consistent with the rotation direction of the main shaft 1, the rotating turbulence groove 221 generates a reverse thrust on the dust in the spiral direction, pushing most of the dust back into the crushing chamber. A small amount of dust that breaks through the protection of the turbulence groove 221 moves towards the gap between the baffle 3 and the cylindrical section 21 and is intercepted by the axial elastic sealing barrier of the rubber plate 5 and the baffle 3. If a very small amount of dust radially penetrates along the gap between the rubber plate 5 and the cylindrical section 21, it will be intercepted by the radial seal formed by the sealing ring 8 and the cylindrical section 21. Furthermore, the oil film in the oil reservoir 711 further fills the tiny gap between the sealing ring 8 and the cylindrical section 21, forming a liquid sealing barrier that completely blocks the dust penetration path. Throughout the process, the axial positioning of the retaining ring 10 on the spiral sleeve 2 ensures the relative position stability of each component, and the pressure cap 7 fixed by the fastener 6 ensures the continuous and effective sealing of the rubber plate 5 and the sealing ring 8, achieving comprehensive and long-lasting sealing protection.

[0029] In this embodiment, the abutment structure between the spiral bushing 2 and the gear disc 4 establishes the foundation for axial sealing, directly blocking the main path of dust penetration along the axial direction. The design of the turbulence groove 221, which rotates in the same direction as the main shaft 1, utilizes the active reverse thrust generated by the rotation of the main shaft 1 to actively intercept and guide dust, changing the traditional passive blocking mode of sealing and improving the protection capability against high-pressure dust. The conical structure of the frustum section 22, in conjunction with the turbulence groove 221, shortens the interaction distance between the dust and the turbulence groove 221, making it easier for the dust to be pushed in the reverse direction and optimizing the guiding efficiency.

[0030] The contact between the rubber plate 5 and the baffle 3 forms a second sealing barrier. Its elastic properties can fill assembly gaps and absorb vibration. Combined with the fixing effect of the gland 7 and the fastener 6, it ensures the tightness and stability of the seal, preventing seal failure due to equipment vibration. The radial seal of the sealing ring 8 and the axial seal of the rubber plate 5 form a three-dimensional protection system, intercepting dust from different directions and further reducing the risk of spillage. The cooperation between the oil reservoir 711 and the oil cup 9 not only provides lubrication for the mating surfaces of the sealing ring 8 and the cylindrical section 21, reducing component wear and extending service life, but also enhances the radial sealing effect through the oil film, achieving the dual functions of lubrication and sealing.

[0031] The axial limiting function of the retaining ring 10 ensures that the fit clearance between the spiral sleeve 2 and the gear disc 4 and baffle 3 remains uniform, preventing local dust accumulation or weakened turbulence force due to uneven clearance, thus guaranteeing the overall stability of the sealing structure. The coordinated operation of each component constructs a multi-layered, three-dimensional sealing system, effectively solving the problem of poor dust sealing capability in traditional structures. This prevents dust contamination of the bearing chamber and gearbox lubrication system, reduces abnormal wear of critical components, and prevents dust leakage from harming the health of operators, meeting environmental protection requirements.

[0032] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A cavity sealing structure for a crusher, used to be installed on the main shaft (1) of the crusher, characterized in that, The sealing structure includes a spiral sleeve (2) fitted on the main shaft (1) and a baffle (3) fitted on the spiral sleeve (2). The main shaft (1) is provided with a gear disk (4). One end of the spiral sleeve (2) abuts against the end face of the gear disk (4). The outer peripheral wall of the spiral sleeve (2) has a spiral turbulence groove (221). The direction of rotation of the turbulence groove (221) is the same as the direction of rotation of the main shaft (1), which is either clockwise or counterclockwise.

2. The cavity sealing structure for a crusher according to claim 1, characterized in that, The spiral bushing (2) includes a connected cylindrical section (21) and a frustum section (22). The turbulence groove (221) is located on the outer peripheral wall of the frustum section (22). The frustum section (22) has a large diameter end (222) and a small diameter end (223). The cylindrical section (21) is connected to the large diameter end (222), and the small diameter end (223) abuts against the toothed disc (4).

3. The cavity sealing structure for a crusher according to claim 2, characterized in that, It also includes a rubber plate (5) sleeved on the cylindrical section (21), the rubber plate (5) being located on the side of the baffle (3) away from the toothed disc (4), and the rubber plate (5) abutting against the baffle (3).

4. The cavity sealing structure for a crusher according to claim 3, characterized in that, It also includes fasteners (6) and a pressure cap (7) fitted on the cylindrical section (21), the pressure cap (7) abutting against the rubber plate (5), the pressure cap (7), the rubber plate (5) and the baffle (3) being fixed by the fasteners (6).

5. A cavity sealing structure for a crusher according to claim 4, characterized in that, The inner circumferential wall of the pressure cap (7) has an annular groove (71), and a sealing ring (8) is embedded in the annular groove (71). The sealing ring (8) is sleeved on the cylindrical section (21).

6. The cavity sealing structure for a crusher according to claim 5, characterized in that, The annular groove (71) also has an oil storage groove (711) on its peripheral wall, and the pressure cap (7) is also provided with an oil cup (9) that enters the oil storage groove (711).

7. The cavity sealing structure for a crusher according to claim 1, characterized in that, It also includes a retaining ring (10) on the main shaft (1), the retaining ring (10) abutting against the end of the spiral sleeve (2) away from the gear disk (4), the retaining ring (10) being used to lock the axial position of the spiral sleeve (2).

8. A cavity sealing structure for a crusher according to any one of claims 2-6, characterized in that, The taper of the frustum section (22) is 1:8 to 1:

15.

9. A cavity sealing structure for a crusher according to any one of claims 1-7, characterized in that, The pitch of the turbulence groove (221) is 5 to 20 mm.

10. A cavity sealing structure for a crusher according to any one of claims 1-7, characterized in that, The lead of the turbulence groove (221) is 30-60 mm.

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