A middle groove segmented cladding pattern for achieving uniform wear

Abstract

This invention relates to the field of underground coal mine conveying machinery technology, specifically a segmented cladding pattern for the surface of the middle plate of a trough. Practice has shown that while cladding treatment enhances the wear resistance of the middle trough surface, it often fails prematurely due to uneven wear, failing to fully realize its overall wear resistance potential. This invention designs a segmented cladding pattern for the surface of the middle plate of a middle trough. Its characteristic is that, along the coal flow direction of the middle plate, the cladding pattern is divided into three sequentially connected segments: segment 1, segment 2, and segment 3. Segments 1 and 3 are full cladding layers, while segment 2 includes patterns on the chain track and non-chain track areas. This invention, through segmented cladding, achieves uniform wear of the middle plate cladding layer, effectively avoiding four typical wear failures: end wear, chain track wear, "ploughing" wear, and closed patterns. This maximizes the wear resistance potential of the middle plate cladding layer, extends the service life of the middle trough, and reduces the cladding cost.

Description

Technical Field

[0001] This invention relates to the field of underground coal mine conveying machinery technology, specifically to wear-resistant treatment technology for the middle trough of a scraper conveyor, and in particular to a segmented cladding pattern for the surface of the middle plate of the middle trough. Background Technology

[0002] Scraper conveyors are key equipment in fully mechanized coal mining faces. The central trough, as the core load-bearing component for material transport, directly determines the overall service life and maintenance costs of the machine. To improve the wear resistance of the central trough's plate, plasma cladding and laser cladding technologies have become mainstream processes in the industry for preparing wear-resistant coatings on the plate surface. Full cladding of the entire central trough plate is costly and generates significant internal stress; currently, cladding patterns are more commonly used. However, practice shows that clad central troughs often fail prematurely due to uneven wear, and their overall wear resistance potential is not fully realized. Analysis of failed components in the field reveals four typical forms of localized wear failure: End wear failure: Due to the installation misalignment between adjacent middle slots, a protrusion is formed at their joint. During operation, hard gangue particles continuously scrape and impact the cladding layer at this protrusion, causing the end cladding layer to wear away prematurely.

[0003] Chain track wear failure: As the running track of the scraper chain, the chain track area not only bears the sliding friction of the material, but also needs to withstand the repeated crushing and impact of the chain, resulting in the comprehensive stress on this part being much higher than that on other areas, thus causing severe wear.

[0004] "Groove" wear failure: In the direction of coal flow, there are localized weak abrasion areas on the surface of the medium plate with no or few cladding points. These areas are "plowed" into deep grooves by hard particles. Once such "grooves" are formed, they will aggravate the exposure and wear of the substrate within the groove, forming a vicious cycle of "the weaker, the more abrasion," ultimately leading to rapid structural failure.

[0005] Closed-pattern wear failure: If the cladding pattern adopts a closed or semi-closed structure, hard gangue particles are easily trapped inside. During operation, these trapped particles will continuously grind the pattern wall, causing the local cladding layer to be worn through prematurely.

[0006] In summary, the core deficiency of existing technologies lies in the fact that the layout design of the cladding layer fails to address the complex and uneven actual working conditions. Therefore, there is an urgent need for an innovative cladding pattern design to achieve uniform wear on the middle plate, thereby maximizing its service life. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a segmented cladding pattern for the center groove that achieves uniform wear. This design effectively avoids the aforementioned localized wear failure problem, fully utilizes the wear resistance potential of the center plate cladding layer, thereby significantly extending the service life of the center groove, while also reducing cladding costs.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A segmented cladding pattern for a central trough to achieve uniform wear is characterized by dividing the cladding pattern into three sequentially connected segments—a first segment, a second segment, and a third segment—along the coal flow direction of the central trough plate. The first and third segments constitute a full cladding layer, used for focused protection of the severely abraded end areas. The second segment includes patterns on both the chain track and non-chain track areas to achieve optimized protection and uniform wear in the main body area.

[0009] Preferably, the pattern on the chain track consists of two first-type triangular waves parallel to the coal flow direction and positioned on either side of the chain track's centerline; the wave height of the first-type triangular wave is 'a', satisfying a ≥ 'd', where 'd' is the diameter of the matching chain. This design ensures that the triangular waves effectively support the chain, causing wear to occur within the cladding layer itself. Simultaneously, the double cladding (two first-type triangular waves) strengthens the density of cladding points at the chain track, preventing chain track wear failure.

[0010] Further preferably, the distance between the two first-type triangular waves in the chain track is equal to their wave height 'a', and the vertical distance from the crests of the two first-type triangular waves to the center line of the chain track is equal. The two first-type triangular waves on one side of the chain track are mirror-symmetrical about the center line of the central groove to the two first-type triangular waves on the other side of the chain track. This arrangement ensures the stability of the chain operation.

[0011] Preferably, the pattern in the non-chain section is composed of multiple second-type triangular waves parallel to the coal flow direction; the wave height of the second-type triangular wave is 2a, and the spacing between adjacent second-type triangular waves is equal.

[0012] The most crucial feature of this invention lies in the following: In the second section, a virtual straight line is drawn along the coal flow direction at any point on the surface of the central trough plate, running through both ends. The intersection points of this virtual straight line and the cladding pattern are statistically macroscopically uniformly distributed. This feature is the core mechanism for achieving uniform wear and avoiding the formation of "grooves".

[0013] Preferably, the first type of triangular wave and the second type of triangular wave, as well as adjacent second type of triangular waves, do not intersect each other. This open pattern design avoids the trapping of gangue particles and prevents the closed pattern from wearing out and failing.

[0014] Ultimately, the cladding patterns of the first, second, and third sections together completely cover the working surface of the central slot plate.

[0015] The beneficial effects of this invention are: 1. Segmented Differentiated Protection: For the severe wear at the ends, a full fusion cladding is used for key reinforcement; for the middle section, an optimized pattern is used to balance wear resistance and cost.

[0016] 2. Precisely address specific failures: The symmetrical triangular wave design in the chain track area effectively resists chain impact and avoids chain track failure; the open, non-intersecting pattern avoids particle confinement and closed failure.

[0017] 3. The core mechanism for achieving uniform wear: By ensuring the uniform distribution of cladding points on a macroscopic scale, wear is guided to proceed synchronously, fundamentally solving the problem of "ploughing" wear and maximizing the overall lifespan of the middle plate.

[0018] 4. Significant overall benefits: While achieving uniform wear and extending service life, it reduces the cost of cladding materials and process stress compared to full cladding. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall layout of the segmented cladding pattern of the present invention on the central groove plate.

[0020] In the diagram: 1. Paragraph 1, 2. Paragraph 2, 3. Paragraph 3 The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] like Figure 1 As shown, a segmented cladding pattern for a central trough that achieves uniform wear is divided into three sequentially connected segments: segment 1, segment 2, and segment 3, along the coal flow direction of the central trough plate. Segments 1 and 3 form a full cladding layer to protect the ends from wear. Segment 2 includes patterns on the chain track and patterns on non-chain track areas.

[0022] Specifically, the pattern in the chain track area consists of two Type I triangular waves parallel to the coal flow direction and positioned on either side of the chain track centerline, with a wave height 'a' greater than or equal to the diameter 'd' of the matching chain. The distance between the two Type I triangular waves in the chain track area is equal to their wave height 'a', and the vertical distance from the crests of the two Type I triangular waves to the chain track centerline is equal. Two Type I triangular waves on one side of the chain track are mirror-symmetrical about the centerline of the central trough to two Type I triangular waves on the other side of the chain track. The pattern in the non-chain track area consists of multiple Type II triangular waves parallel to the coal flow direction, with a wave height of 2a and equal spacing.

[0023] Crucially, the pattern layout of segment 2 ensures a macroscopically uniform distribution of the cladding layer (intersection point) along any straight line along the coal flow direction on the surface of the medium plate. Furthermore, all pattern units are mutually exclusive, forming an open structure. Ultimately, the three cladding patterns together achieve complete coverage of the working surface of the medium plate.

[0024] Through the above solution, the cladding pattern of the present invention can effectively avoid four typical wear failures: end, chain track, "ploughing groove" and closed pattern, achieve uniform wear of the middle plate, and significantly extend service life.

Claims

1. A segmented cladding pattern with a central groove for achieving uniform wear, characterized in that, Along the coal flow direction of the central trough plate, the cladding pattern is divided into three segments: the first segment (1), the second segment (2), and the third segment (3) that are connected in sequence; the first segment (1) and the third segment (3) are full cladding layers; the second segment (2) includes the pattern of the chain track and the pattern of the non-chain track.

2. The segmented cladding pattern with a central groove for achieving uniform wear according to claim 1, characterized in that, The pattern on the chain track consists of two parallel coal flow directions, arranged on either side of the chain track centerline, representing the first type of triangular waves. The wave height of the first type of triangular waves is a, and a ≥ d, where d is the diameter of the matching chain.

3. The segmented cladding pattern with a central groove for achieving uniform wear according to claim 2, characterized in that, The distance between the two first-type triangular waves in the chain track section is equal to their wave height a, and the vertical distance from the peaks of the two first-type triangular waves to the center line of the chain track is equal.

4. The segmented cladding pattern with a central groove for achieving uniform wear according to claim 2, characterized in that, Two type I triangular waves on one side of the chain track are mirror-symmetrical about the center line of the middle groove and two type I triangular waves on the other side of the chain track.

5. The segmented cladding pattern with a central groove for achieving uniform wear according to claim 1, characterized in that, The pattern in the non-chain section is composed of multiple second-type triangular waves parallel to the coal flow direction; the wave height of the second-type triangular wave is 2a, and the spacing between adjacent second-type triangular waves is equal.

6. The segmented cladding pattern with a central groove for achieving uniform wear according to claim 1, characterized in that, In paragraph 2 (2), a virtual straight line is drawn at any part of the surface of the plate in the middle trough along the coal flow direction, and the intersection of the virtual straight line and the cladding pattern is macroscopically uniformly distributed in a statistical sense.

7. The segmented cladding pattern with a central groove for achieving uniform wear according to claim 4, characterized in that, The first type of triangular wave and the second type of triangular wave do not intersect each other, nor do adjacent second type of triangular waves.

8. A segmented cladding pattern with a central groove for achieving uniform wear according to any one of claims 1 to 7, characterized in that, The cladding patterns of the first section (1), the second section (2), and the third section (3) together completely cover the working surface of the central slot plate.

Images