Reduction of fretting wear in the interference fit of the cone crusher head

Abstract

A system, a cone crusher (300), and its main shaft (100) include: an interference fit section (120) for supporting a crusher head (210), said interference fit section (120) having a nominal interference fit diameter D. if The bottom shaft section (130) extends between the bottom end of the main shaft (100) and the interference fit section (120), and has a bottom (134) and a neck (132). The bottom (134) has a bottom length L. bp and bottom diameter D bp Bottom diameter D bp It remains unchanged below the neck (132), at least for the bottom length L. bp 50%. The neck (132) has a neck diameter that increases toward the interference fit section (120). The spindle (100) has a spindle length L. ms L ms 1.3 / D if At most 40mm 1.3 D bp 1.421 / D if At most 9.0mm 0.421 .

Description

Technical Field

[0001] This disclosure generally relates to the reduction of fretting wear in the interference fit of a cone crusher head. Background Technology

[0002] This section provides useful background information, but does not acknowledge that any techniques described herein represent prior art.

[0003] In a cone crusher, the crusher head is supported and driven by a main shaft to generate crushing force within a crushing chamber defined by outer and inner wear sections. The crusher head is typically integrally formed with the main shaft or attached to it via a tapered fit or interference fit. In the latter case, the crusher head or supporting cone defines a bore of a given height and diameter that expands sufficiently upon heating to allow the crusher head to be placed on the main shaft. Upon cooling to the same temperature as the main shaft, the interference fit securely holds the crusher head in place. Interference fits are also used to attach train wheels to their axles.

[0004] Unlike train wheels, the interference fit of a cone crusher head withstands far more complex dynamic force variations. The majority of the crushing work in a cone crusher head is typically performed near the outermost edge of the bottom region. The bearings of the main shaft require lubrication and isolation from minerals and other contaminants. Therefore, there are slip rings attached to the fixed bottom of the cone crusher, and the moving crusher head is shaped to include armpit-like grooves that receive the slip rings.

[0005] The inventors have analyzed the forces generated during the crushing process and their impact on wear occurring in the crusher head and main shaft. The armpit groove partially aggravates the harmful forces, increasing the mutual sliding distance between the crusher head and the main shaft. That is, the crushing forces induce localized forces in the interference fit area, which sometimes exceed the forces generated by thermal expansion (or contraction), potentially leading to mutual sliding on the order of tens of micrometers. The inventors investigated this mutual sliding based on numerous factors, including the geometry of the shaft and the crusher head.

[0006] The inventors have now developed specific improvements to the crusher head and main shaft, which significantly reduce fretting wear on the crusher head and main shaft. The object of this invention is to reduce fretting wear caused by the interference fit of the cone crusher head. Another object of this invention is to provide at least one new technical alternative. Summary of the Invention

[0007] The appended claims define the scope of protection. Any examples and technical descriptions of devices, products, and / or methods not covered by the claims in the specification and / or drawings are not presented as embodiments of the invention, but as background art or examples to aid in understanding the invention.

[0008] According to a first exemplary aspect, a main shaft for a cone crusher is provided, comprising:

[0009] The interference fit section is used to support the crusher head. This interference fit section has a nominal interference fit diameter D. if ;

[0010] The bottom section extends between the bottom of the main shaft and the interference fit section;

[0011] The bottom section includes a bottom and a neck;

[0012] The bottom has a bottom length L bp and bottom diameter D bp The bottom diameter D bp Keeps unchanged below the neck, at least for the bottom length L. bp 50%;

[0013] The neck has an increased neck diameter that extends toward the interference fit section;

[0014] The spindle has a spindle length L ms ;

[0015] Its characteristic is that, in order to reduce fretting wear in the interference fit section,

[0016] L ms 1.3 / D if Up to 40 mm 0.3 ;and

[0017] D bp 1.421 / D if At most 9.0 mm 0.421 .

[0018] Spindle length L ms It can be at least 1200mm.

[0019] Please note that L ms 1.3 / D if The ratio depends on the units because the powers of the dividend and divisor are different. The value is in mm, now increased to a power of 0.3. For example, if L... ms It is 1300 mm, D if It is 270 mm, L ms 1.3 / D if This will equal (1300mm) 1.3 / (270 mm) = 41.4 mm 0.3It is worth noting that because the dividend and divisor have different powers (1.3 and 1), the unit of the ratio is raised to a power of 0.3. Accordingly, the ratio D... bp 1.421 / D if The unit should be mm, and the result should be mm accordingly. 0.421 .

[0020] Advantageously, it has been found that the first exemplary aspect increases the lifespan of the cone crusher head of a commercially available cone crusher by reducing the deformation caused by the load on the main shaft in the interference fit section. Although this advantage has been achieved despite the opposite effect resulting from the corresponding reduction in the material thickness of the crusher head in the interference fit section due to the need to increase the shaft opening into the crusher head, the advantage has been realized.

[0021] More advantageously, it has been found that the first exemplary aspect can reduce sliding and contact dissipation energy, as well as reduce the stress and stress changes caused by the cone crusher head when it is attached to the main shaft of the first exemplary aspect.

[0022] Furthermore, it has been found that the inertia of the combination of the main shaft and the crusher head does not increase proportionally with the increase in diameter, because the increased inertia on the main shaft side is compensated by the decreased inertia on the crusher head side.

[0023] Furthermore, it has been determined that the increased diameter in the interference fit section also increases the load surface area in the interference fit section, which further helps to reduce fretting wear. At the same time, the reduced deformation in the interference fit section is considered to be the main reason for the significant increase in service life.

[0024] The interference fit section can have an interference fit section length B, and the interference fit section is configured to interfere with the crusher head along its entire length. D bp 1.421 / D if It can be up to 8.0 mm. 0.421 .

[0025] The main shaft may consist of only one interference fit section for attaching the crusher head. The interference fit section may be longitudinally continuous.

[0026] The spindle may include the top section extending from the interference fit section to the top surface of the spindle.

[0027] The neck diameter can increase towards the interference fit section to the diameter of the interference fit section. The neck can gradually increase towards the interference fit section. The increasing diameter of the interference fit section allows the neck to gradually increase to the diameter of the interference fit section. The gradually curved neck can reduce stress concentration. The neck can grow towards the interference fit section in a first growth segment with a first growth radius, and closer to the interference fit section, the neck can grow in a second growth segment with a second growth radius. The first and second growth segments can be separated by linear growth segments. The first growth radius can be larger than the second growth radius. Optionally, the neck can decrease in size towards the interference fit section. The first growth radius can be smaller than the second growth radius. The first growth radius can be at least 50 mm; 150 mm; 250 mm; 350 mm; 450 mm; or 550 mm. The first growth radius can be at most 200 mm; 300 mm; 400 mm; 500 mm; or 600 mm. The second growth radius can be at least 50 mm; 150 mm; 250 mm; 350 mm; 450 mm; or 550 mm. The second growth radius can be up to 200 mm; 300 mm; 400 mm; 500 mm; or 600 mm.

[0028] The nominal interference fit section diameter can be adapted to the diameter of the interference fit crusher head with the nominal interference fit diameter.

[0029] The interference fit section can be conical to a certain extent. In this case, the nominal diameter of the interference fit section refers to the average diameter of the interference fit section.

[0030] The main shaft can be configured to laterally support the crusher head solely through an interference fit section. Advantageously, by providing lateral support for the crusher head solely through the interference fit section, it is unnecessary to allocate some of the main shaft's height for additional lateral support of the crusher head. Consequently, the interference fit section can be made longer in the longitudinal direction, thereby further reducing fretting wear. Even more advantageously, the machining of the crusher head becomes simpler because it eliminates the need to machine opening sections of varying radii for longitudinal support. The longitudinal length of the interference fit section can be at least 50% of the longitudinal length or height of the cone crusher head.

[0031] The longitudinal length of the interference fit section is at most 70% of the longitudinal length or height of the cone crusher head. Advantageously, the reinforced interference fit section of the first exemplary aspect can structurally allow the cone crusher head to have at least 30% vertical overhang relative to the length of the interference fit section.

[0032] The nominal diameter of the interference fit section is at most 70% of the longitudinal length or height of the cone crusher head.

[0033] According to a second exemplary aspect, a system is provided that includes a main shaft and a cone crusher head, the cone crusher head being configured to be interference-fitted to an interference-fit section of the main shaft.

[0034] A cone crusher head may have a cone sector shape of at least 45 degrees. A cone crusher head may have a cone sector shape of at least 50 degrees. A cone crusher head may have a cone sector shape of at least 55 degrees.

[0035] Conical sector can refer to the sector shape of the central cross-section of the crusher head between the opposing support surfaces.

[0036] A cone crusher head can have a cone sector of up to 55 degrees. A cone crusher head can have a cone sector of up to 60 degrees. A cone crusher head can have a cone sector of up to 70 degrees.

[0037] The nominal diameter of the interference fit section can be at least 40% of the diameter of the cone crusher head.

[0038] The cone crusher head can be attached to the main shaft.

[0039] According to a third exemplary aspect, a cone crusher including a system of the second exemplary aspect is provided.

[0040] Different non-binding exemplary aspects and implementations have been described above. The foregoing implementations are only for illustrating selected aspects or steps that can be used in different implementations. Some implementations may be presented with reference only to certain exemplary aspects. It should be understood that corresponding implementations can also be applied to other exemplary aspects. Attached Figure Description

[0041] Some exemplary embodiments will be described with reference to the accompanying drawings, in which:

[0042] Figure 1 The spindle of an exemplary embodiment is schematically shown;

[0043] Figure 2 A system of a spindle and cone crusher head, illustrating an exemplary embodiment, is shown schematically; and

[0044] Figure 3 The illustration shows including Figure 2 The cone crusher system. Detailed Implementation

[0045] In the following description, similar reference numerals denote similar elements or steps.

[0046] Figure 1 The spindle 100 of an exemplary embodiment is shown schematically. Figure 1Some parts and dimensions of the spindle (mms) are shown, such as thread 110 for attaching the wear-resistant part (not shown) by means of a nut (not shown); interference fit section 120; bottom spindle section 130, including bottom 134 and neck 132 between bottom 134 and interference fit section (120).

[0047] Figure 1 The display shows some dimensions, such as L for length and D for diameter, with subscripts indicating the objects they relate to.

[0048] exist Figure 1 In this embodiment, the diameter of the bottom remains constant along its entire length, although there may be some rounding at the very bottom. In some other embodiments, the diameter of some portions of the bottom may be larger or smaller, but the diameter of the bottom is at least 50% of the bottom length. It is also possible that this at least 50% is formed by two or more portions.

[0049] The interference fit section has a nominal diameter D if The nominal diameter D if The configuration is such that it has a nominal diameter D. if The cone crusher head has an open shaft. In one embodiment, the nominal diameter of one or both ends of the interference fit section is slightly larger, for example, with a nominal diameter D. if Compared to the range of tens or hundreds of parts per million.

[0050] like Figure 1 As shown, in an exemplary embodiment, the main shaft includes only one interference fit section for attaching the crusher head. Preferably, the interference fit section is longitudinally continuous.

[0051] like Figure 1 As shown, the diameter of the neck increases towards the interference fit section. In Figure 1 In this implementation, the neck grows to the nominal diameter, or in other words, the surface of the spindle deviates from the vertical plane formed relative to the axial direction of the spindle, and remains off-center from the center of the interference fit section 120 throughout the neck.

[0052] Similarly, Figure 1 and Figure 2 As shown, the main shaft 100 can be configured to laterally support or at least laterally engage the crusher head only through an interference fit section.

[0053] exist Figure 1 In the main shaft 100, L is made possible by forming an interference section and a bottom. ms 1.3 / D if The ratio is at most 40 mm 0.3 This reduces fretting wear in the interference fit section; and the dimensions of the interference fit section 120 and the bottom make Dbp 1.421 / D if At most 9.0 mm 0.421 .

[0054] It should be understood that the main shaft 100 and the cone crusher head form a system. The larger the diameter of the interference fit section, the wider the opening required in the crusher head, and therefore the thinner the structure at this point. Intuitively, it can be assumed that the system becomes more prone to deformation as the diameter increases, since all sides of the shaft are subjected to the compression of the interference fit attached to the crusher head. However, surprisingly, it was found that in two different commercially available cone crushers, the sliding distance and fretting wear under different loads were reduced by ten percent or more. Although the entire force system is not fully understood, it is believed that L... ms 1.3 / D if The ratio is at most 40 mm 0.3 This can reduce fretting wear. In an exemplary embodiment, L ms 1.3 / D if The ratio is at most 37.5mm 0.3 In an exemplary implementation, L ms 1.3 / D if The ratio is at least 30 mm 0.3 In another exemplary embodiment, L ms 1.3 / D if The ratio is at least 32.5 mm. 0.3 The second condition, D bp 1.421 / D if It is anticipated that operation will be achieved through dynamics at the bottom of the spindle extending throughout the interference fit section 120. In an exemplary embodiment, this ratio is at most 8.0 mm. 0.421 In an exemplary embodiment, this ratio is at most 7.7 mm. 0.421 In an exemplary embodiment, this ratio is at least 6.4 mm. 0.421 Or at least 6.9 mm 0.421 .

[0055] Figure 2 A system 200 consisting of a spindle 100 and a cone crusher head 210, according to an exemplary embodiment, is shown. Figure 2 The inner wear portion 220, which is attached to the cone crusher head 210 by a nut 230, is also shown. Figure 2 The conical sector of the cone crusher head 210 is also shown by extended dashed lines. Furthermore, Figure 2 The diameter D of the cone crusher head is shown.ch and the length L of the cone crusher head ch This length refers to the longitudinal length or height of the cone crusher head 210.

[0056] Figure 3 The illustration shows including Figure 2 The system includes a cone crusher 300, which includes a main shaft 100, a cone crusher head 210, an outer wear section 310, and a crushing chamber 320 located between the inner wear section 220 and the outer wear section 310.

[0057] Various implementation methods have been presented. It should be understood that in this document, "including," "comprising," and "containing" are all open-ended expressions and are not exclusive.

[0058] The foregoing description has provided a complete and informative description of the best mode of carrying out the invention as currently contemplated by the inventors, through non-limiting examples of specific implementations and methods. However, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing embodiments, but can be implemented in other embodiments using equivalent means or in different combinations of embodiments without departing from the characteristics of the invention.

[0059] Furthermore, some features of the exemplary embodiments disclosed above can be used advantageously without the need for corresponding use of other features. Therefore, the foregoing description should be considered merely as an illustration of the principles of the invention and not as a limitation thereof. Consequently, the scope of the invention is limited only by the appended claims.

Claims

1. A main shaft (100) of a cone crusher (300), comprising: An interference fit section (120) is used to support the cone crusher head (210), the interference fit section (120) having a nominal interference fit diameter D. if ; The bottom shaft section (130) extends between the bottom end of the main shaft (100) and the interference fit section (120); The bottom shaft section (130) includes a bottom (134) and a neck (132). The bottom (134) has a bottom length L bp and bottom diameter D bp The bottom diameter remains constant below the neck (132), and is at least the bottom length L. bp 50%; The neck (132) has a neck diameter that increases toward the interference fit section (120); The spindle (100) has a spindle length L ms ; Its characteristic is that, in order to reduce fretting wear in the interference fit section (120), L ms 1.3 / D if Up to 40 mm 0.3 ;and D bp 1.421 / D if At most 9.0 mm 0.421 .

2. The main shaft (100) of the cone crusher (300) according to claim 1, wherein, The spindle length L ms At least 1200 mm.

3. The main shaft (100) of the cone crusher (300) according to claim 1 or 2, wherein, D bp 1.421 / D if At most 8.0 mm 0.421 .

4. The main shaft (100) of the cone crusher (300) according to claim 1 or 2, wherein, D bp 1.421 / D if At least 6.4 mm 0.421 .

5. The main shaft (100) of the cone crusher (300) according to claim 1 or 2, wherein L ms 1.3 / D if At least 30mm 0.3 .

6. The main shaft (100) of the cone crusher (300) according to claim 1 or 2, wherein, The interference fit section (120) is longitudinally continuous.

7. The main shaft (100) of the cone crusher (300) according to claim 1 or 2, wherein, The main shaft (100) is configured to laterally support the cone crusher head (210) only through the interference fit section (120).

8. The main shaft (100) of the cone crusher (300) according to claim 1 or 2, wherein, The diameter of the neck is at most equal to the diameter of the interference fit section.

9. The main shaft (100) of the cone crusher (300) according to claim 1 or 2, wherein, The neck (132) is gradually curved to reduce stress concentration.

10. A system comprising a main shaft (100) and a cone crusher head (210) of a cone crusher (300) according to any one of the preceding claims, the cone crusher head (210) being configured to be interference-fitted to an interference-fit section (120) of the main shaft.

11. The system according to claim 10, wherein, The cone crusher head has a conical sector (α) of at least 45 degrees.

12. The system according to claim 10, wherein, The cone crusher head (210) has a conical sector (α) of at least 55 degrees.

13. The system according to any one of claims 10 to 12, wherein, Nominal interference fit diameter D if At least the diameter D of the cone crusher head ch 40%.

14. The system according to any one of claims 10 to 12, wherein, The cone crusher head (210) is attached to the main shaft (100).

15. A cone crusher (300) comprising the system according to any one of claims 10 to 14.

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