Steel rope pulley

Abstract

This invention discloses a steel rope reel with at least two annular rope grooves arranged on its circumferential surface. These grooves accommodate ropes, and the contact surfaces between the grooves and the ropes are laser-hardened. Adjacent grooves are separated by shoulders, each shoulder having at least one annular groove or at least one set of annular holes. After laser hardening, a hardened layer and a heat-affected zone are formed on both sides of the grooves on the shoulders, and the heat-affected zone does not overlap with the hardened layer. This invention eliminates the tempering phenomenon that occurs in parts of the rope grooves during laser hardening.

Description

Technical Field

[0001] This invention relates to the field of mechanical manufacturing, and specifically to a steel rope wheel with a rope groove surface hardened by laser quenching. Background Technology

[0002] In some mechanical manufacturing fields, such as elevator products, the grooves of rope pulleys, especially traction pulleys, may wear when meshing with matching ropes (such as wire ropes). To improve wear resistance, a process of localized hardening treatment using a high-power laser beam to irradiate the surface of the rope groove can be employed to increase the surface hardness, thereby enhancing wear resistance.

[0003] like Figure 1 As shown, rope pulley 02 is a steel structure rope pulley, typically made of pearlitic ductile iron. The laser beam emitted from laser head 01 irradiates the rope groove of rope pulley 02; the high energy density of the laser beam generates instantaneous high temperatures, transforming the microstructure of the rope groove of rope pulley 02 from pearlite to martensite, forming... Figure 2 The effective hardened layer 21. In the adjacent region of the effective hardened layer 21 ( Figure 2 The dotted area 22 in the image is also affected by the temperature rise caused by thermal radiation during laser irradiation, but it is not enough to transform the metallographic structure from pearlite to austenite and martensite. This area 22 is called the heat-affected zone, and its hardness is much lower than that of the effective hardened layer 21.

[0004] When a rope pulley has multiple rope grooves that require laser hardening, the order in which the laser irradiates the surface of the rope grooves may affect the hardening effect. For example... Figure 3 As shown, during the hardening process, the laser beam forms an effective hardened layer 31 on the right side surface of the first irradiated rope groove. Subsequently, when hardening the left side surface of the adjacent rope groove, the laser beam forms an effective hardened layer 32 and a heat-affected zone 33 after irradiation. If the size of the groove shoulder 34 is small, the heat-affected zone 33 intersects with the previously formed effective hardened layer 31 area. The overlapping area 35 is affected by the secondary heating and undergoes tempering, which significantly reduces its hardness, thus affecting the overall effect of laser hardening treatment of the rope groove. Summary of the Invention

[0005] The summary of this invention introduces a series of simplified concepts, all of which are simplifications of existing technologies in the field, and will be further explained in detail in the detailed description section. This summary is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] The technical problem to be solved by this invention is how to eliminate the tempering phenomenon that occurs in the rope groove area during laser quenching.

[0007] To solve the above-mentioned technical problems, the present invention provides a steel rope pulley, wherein at least two annular rope grooves are arranged on the circumferential surface of the rope pulley, the rope grooves are used to accommodate ropes, the contact surfaces of the rope grooves and the ropes are subjected to laser hardening treatment, adjacent rope grooves are separated by groove shoulders, and at least one annular groove or at least one set of annular holes are machined on the groove shoulders; after laser hardening treatment, the two rope grooves on the groove shoulders form a hardened layer and a heat-affected zone, and the heat-affected zone does not overlap with the hardened layer.

[0008] Preferably, the maximum depth dimension of the annular groove exceeds the maximum width dimension of the cross-section.

[0009] Preferably, the bottom of the cross-section of the annular groove is rectangular, trapezoidal, semi-circular, or triangular.

[0010] Preferably, the cross-section of the annular groove has at least a toothed profile structure on both sides.

[0011] Preferably, the annular groove is filled with heat-insulating material.

[0012] Preferably, the heat insulation material is silica aerogel.

[0013] Preferably, the shoulder of the groove is machined with two sets of annular array holes, the two sets of annular array holes have the same number of holes and are paired one-to-one, and the two paired holes are interconnected.

[0014] Preferably, the plane containing the center lines of the holes in the two sets of annular arrays is perpendicular to the axis of the rope wheel.

[0015] Preferably, the plane containing the center lines of the holes in the two sets of annular arrays is coplanar with the axis of the rope wheel.

[0016] Preferably, the inner walls of the holes in the two sets of annular arrays have at least a portion of a toothed profile structure. Attached Figure Description

[0017] The accompanying drawings are intended to illustrate the general characteristics of the methods, structures, and / or materials used in specific exemplary embodiments of the invention, supplementing the description in the specification. However, the drawings are schematic diagrams not drawn to scale and may not accurately reflect the precise structural or performance characteristics of any of the given embodiments. The drawings should not be construed as limiting or restricting the range of numerical values ​​or properties covered by exemplary embodiments of the invention. The invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0018] Figure 1 A schematic diagram of laser irradiation of the groove of a steel rope wheel using existing technology;

[0019] Figure 2 This is a schematic diagram of the effective hardened layer and heat-affected zone on one side of the groove shoulder in existing technology.

[0020] Figure 3 A schematic diagram of the overlapping area of ​​the tempering generated by the laser irradiating the rope grooves on both sides of the groove shoulder in the existing technology;

[0021] Figure 4 This is a schematic diagram of the groove on the shoulder of the laser-hardened rope wheel groove in Example 1;

[0022] Figure 5 This is a schematic diagram of the effective hardened layer and heat-affected zone on both sides of the groove shoulder in Example 1;

[0023] Figure 6 Schematic diagrams of different groove shapes in Example 1;

[0024] Figure 7 This is a schematic diagram of the contour shape of both sides of the groove cross-section in Example 1;

[0025] Figure 8 This is a schematic diagram of the small opening on the shoulder of the surface-hardened steel rope pulley in Example 2;

[0026] Figure 9 This is a schematic diagram of the radial cross-section of the two sets of small holes on the shoulder of the surface-hardened steel rope pulley in Example 3;

[0027] Figure 10 This is a schematic diagram of the axial cross-section of the two sets of small holes on the shoulder of the surface-hardened steel rope pulley in Example 4;

[0028] Figure 11 This is a schematic diagram of the cross-section of the open threaded small hole in Example 4. Detailed Implementation

[0029] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can fully understand other advantages and technical effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific embodiments, and the details in this specification can also be applied based on different viewpoints, with various modifications or changes made without departing from the overall design concept of the invention. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. The following exemplary embodiments of the present invention can be implemented in many different forms and should not be construed as being limited to the specific embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the technical solutions of these exemplary embodiments to those skilled in the art.

[0030] Example 1

[0031] This embodiment provides a steel rope pulley 4, the cross-section of which is as follows: Figure 4 As shown. At least two annular rope grooves 40 and 41 are arranged on the circumferential surface of the rope pulley 4. A shoulder 42 of a certain thickness exists between the annular rope grooves 40 and 41, and at least one annular groove 43 is machined on the shoulder 42. The maximum depth dimension of the annular groove 43 exceeds its maximum width dimension. During laser quenching, a high-energy laser beam irradiates the two rope grooves on the shoulder 42 (e.g., ...). Figure 5 In sections 400 and 401, effective hardened layers 50 and 52 and heat-affected zones 51 and 53 are generated, respectively. Due to the barrier effect of groove 43, heat-affected zones 51 and 53 do not overlap with effective hardened layers 50 and 52, thereby eliminating the tempering phenomenon of effective hardened layers.

[0032] Preferably, the bottom of the cross-section of the annular groove can be as follows: Figure 6 The rectangle 61, trapezoid 62, semicircle 63, or triangle 64 are among them.

[0033] Preferably, the annular groove has at least a toothed profile structure on both sides of its cross-section, such as... Figure 7 The annular groove 71 shown is an example of a toothed annular groove. This groove increases the heat dissipation area, carrying away more heat from the heat-affected zone and eliminating tempering of the effective hardened layer.

[0034] Preferably, the annular groove can be filled with a heat-insulating material, such as silica aerogel, to enhance the heat diffusion barrier effect of the annular groove.

[0035] Example 2

[0036] This embodiment provides a steel rope pulley 8, whose axial and radial cross-sections are as follows: Figure 8 As shown, at least two annular rope grooves 81 and 82 are arranged on the circumferential surface of the rope pulley. Between the annular rope grooves 81 and 82 is a shoulder 83 of a certain thickness, and at least one set of annular array holes 84 are machined on the shoulder 83. During laser irradiation of the rope grooves, the holes not only block the heat diffusion of the heat-affected zone, but also allow for the simultaneous blowing of air from the holes on the shoulder using a high-pressure air gun during laser beam scanning, removing some of the heat from the heat-affected zone and thus eliminating tempering of the effective hardened layer. Compared to the steel rope pulley 4 in Embodiment 1, the shoulder maintains better lateral stiffness.

[0037] Example 3

[0038] This embodiment provides a steel rope pulley 9, the isometric view and radial section view of which are shown below. Figure 9As shown. At least two annular grooves are arranged on the circumferential surface of the steel rope sheave groove, with a shoulder separating adjacent grooves. Two sets of annular array holes, group A and group B, are machined on the shoulder. The number of array holes is the same and they are paired one-to-one, with the paired holes interconnected. The plane containing the center lines of array holes A and B is perpendicular to the axis of the steel rope sheave 9. When the laser beam irradiates the rope sheave groove, the array holes not only block the heat diffusion of the heat-affected zone, but also allow for simultaneous air blowing from a high-pressure air gun onto the small holes on the shoulder during laser beam scanning. Because array holes A and B are interconnected, the gas ejected from the high-pressure air gun has better flowability, carrying away most of the heat from the heat-affected zone, thereby eliminating the tempering phenomenon of the effective hardened layer.

[0039] Example 4

[0040] This embodiment provides a steel rope pulley 10, the isometric view and axial section view of which are shown below. Figure 10 As shown. At least two annular grooves are arranged on the circumferential surface of the steel rope sheave groove, with a shoulder separating adjacent grooves. Two sets of annular array holes, group C and group D, are machined on the shoulder. The number of array holes is the same and they are paired one-to-one, with the paired holes interconnected. The plane containing the center lines of array holes C and D is coplanar with the axis of the steel rope sheave 9. When the laser beam irradiates the rope sheave groove, the array holes not only block the heat diffusion of the heat-affected zone, but also allow for simultaneous air blowing from a high-pressure air gun onto the small holes on the shoulder during laser beam scanning. Because array holes C and D are interconnected, the gas ejected from the high-pressure air gun has better flowability, carrying away most of the heat from the heat-affected zone, thereby eliminating the tempering phenomenon of the effective hardened layer.

[0041] Preferably, the annular array holes on the shoulders of the steel rope pulleys 8, 9, and 10 in embodiments 2, 3, and 4 have at least a portion of toothed contour structures on their sidewalls, such as threaded holes. Figure 11 As shown. The advantage of the toothed contour structure is that it can increase the heat dissipation area, remove more heat from the heat-affected zone, and eliminate the tempering phenomenon of the effective hardened layer.

[0042] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It will also be understood that, unless expressly defined herein, terms such as those defined in a general dictionary shall be interpreted as having the meaning consistent with their meaning in the relevant field context, and not as having an idealized or overly formal meaning.

[0043] The present invention has been described in detail above through specific embodiments and examples, but these are not intended to limit the invention. Many modifications and improvements can be made by those skilled in the art without departing from the principles of the invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A steel rope pulley, characterized in that At least two annular rope grooves are arranged on the circumferential surface of the rope wheel. The rope grooves are used to accommodate ropes. The contact surfaces of the rope grooves and the ropes are laser-hardened. Adjacent rope grooves are separated by groove shoulders. At least one annular groove or at least one set of annular holes is machined on the groove shoulders. After laser hardening, the rope grooves on both sides of the groove shoulder form a hardened layer and a heat-affected zone, and the heat-affected zone does not overlap with the hardened layer.

2. Steel rope pulley according to claim 1, characterized in that The maximum depth of the annular groove exceeds the maximum width of the cross-section.

3. Steel rope pulley according to claim 2, characterized in that The bottom of the cross-section of the annular groove is rectangular, trapezoidal, semi-circular, or triangular.

4. The steel rope reel according to claim 2, characterized in that... The annular groove has at least a toothed profile structure on both sides of its cross-section.

5. The steel rope reel according to claim 2, characterized in that... The annular groove is filled with heat-insulating material.

6. The steel rope reel according to claim 5, characterized in that... The heat insulation material is silica aerogel.

7. The steel rope reel according to claim 1, characterized in that... The groove shoulder is machined with two sets of annular array holes. The two sets of annular array holes have the same number of holes and are paired one-to-one. The two paired holes are interconnected.

8. The steel rope reel according to claim 7, characterized in that... The plane containing the center lines of the holes in the two sets of annular arrays is perpendicular to the axis of the rope wheel.

9. The steel rope reel according to claim 7, characterized in that... The plane containing the center lines of the holes in the two sets of annular arrays is coplanar with the axis of the rope wheel.

10. The steel rope reel according to claim 7, characterized in that... The inner walls of the holes in the two sets of annular arrays have at least a portion of tooth-shaped contour structures.

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