Wear-resistant ledge and processing method thereof

Abstract

The invention relates to a wear-resistant ledge and a processing method thereof, and belongs to the technical field of wear-resistant ledges. The machining method of the wear-resistant ledge comprises the following steps that 1, the size of a W-shaped groove is increased by 3-7 mm based on seven faces making contact with a scraper, a machining space is reserved, and a ledge blank is obtained through casting; 2, roughly machining the ledge blank; 3, cladding is conducted on the cladding face through a metal powder core welding wire, and a cladding layer is formed; the metal powder core welding wire comprises C, Si, Cr, Mn, Ni, Mo and other components in specific mass percent, and the balance Fe. And 4, finish machining and polishing are conducted, and machining is completed. According to the ledge manufactured through the machining method, the cladding layer is smooth in surface, large in binding force, more wear-resistant and scratch-resistant, the ledge is shiny after being ground after being used for a period of time, abrasion to a scraper cannot be increased, and the ledge has very high application value.

Description

Technical Field

[0001] This invention relates to the field of wear-resistant groove technology, and in particular to a wear-resistant groove and its processing method. Background Technology

[0002] Scraper conveyors are essential equipment in underground coal mining. In the coal face, they not only transport coal but also provide the track for the coal mining machine. They consist of a headstock, power unit, transition trough, intermediate trough, open-window intermediate trough, deflection trough, tailstock, and scraper chain. The intermediate trough is the main component of the scraper conveyor; it is generally a cast-welded sealed-bottom structure, mainly composed of baffle trough sides, shovel trough sides, middle plate, and bottom plate. The intermediate trough serves as the channel for carrying and transporting materials, bearing the wear of the scrapers and materials; therefore, its lifespan directly affects the normal production of the working face.

[0003] Due to the harsh working conditions underground, the middle groove wears out quickly. However, with the strengthening of the materials used in the middle and bottom plates, from NM360 to NM400, NM450, and even the use of imported HB500 grade, the groove sides, being cast parts, have much lower wear resistance than the middle and bottom plates. Existing cast-welded groove sides have the following drawbacks: the wear of the groove sides does not match that of the middle plate, and the groove sides wear out before the middle and bottom plates, affecting the overall machine's performance. Furthermore, groove sides processed using existing methods have the following main drawbacks: firstly, the cladding surface is rough. Existing groove side cladding processes generally use multiple cladding passes, resulting in uneven grooves between each pass and a rough surface; this increases the friction of the scraper operation, increasing product power consumption; and the rough surface of the groove side cladding layer exacerbates scraper wear. Secondly, the bonding force between the cladding layer and the base material is poor. The existing laser cladding or plasma cladding technology has a melting depth of 0.5-1mm. During the production process, after bending and shot blasting, the phenomenon of flaking will occur. After the scraper conveyor is lowered into the well, there is a risk of large-area wear-resistant layer flaking, which will affect the life of the whole machine.

[0004] To address the issue of inconsistent wear between the groove side, middle plate, and bottom plate under complex and harsh working conditions with high gangue content, which accelerates wear, it is urgent to develop a more wear-resistant and scratch-resistant groove side and related processes that match the wear resistance of the middle and bottom plates, have overall dimensions that ensure the passage space for the scraper, and do not increase wear on the scraper. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a wear-resistant groove side and its processing method. The processing method of the wear-resistant groove side provided by this invention can make the groove side more wear-resistant, and match the wear resistance of the middle and bottom plates, without affecting the passage space of the scraper, and has high practical value.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, the present invention provides a method for processing wear-resistant grooves, comprising the following steps:

[0008] Step 1, Casting and Shaping: Based on the cladding surface, increase the size of the W-shaped groove by 3-7mm to leave room for machining, and cast the groove blank; the cladding surface is the seven surfaces of the groove side that contact the scraper.

[0009] Step 2: Roughly machine the groove blank;

[0010] Step 3, Cladding: Use metal-cored welding wire to clad the cladding surface to form a cladding layer;

[0011] The metal-cored welding wire is composed of the following components by mass percentage: 4.5-6.5% C, 0.5-2.5% Si, 20-40% Cr, 0.5-2.5% Mn, 0.1-0.25% Ni, 0.2-0.45% Mo, 0-0.28% S, 0-0.045% P, with the balance being Fe;

[0012] Step 4: Perform fine machining and polishing on the cladding groove side to complete the processing of the wear-resistant groove side.

[0013] The technical solution of this invention mainly utilizes a cladding process to clad the seven surfaces of the channel side that come into contact with the scraper. The cladding material used is a metal-cored welding wire with a specific component ratio. After the cladding layer is formed on the corresponding surfaces, a large number of hard chromium carbide particles are generated. This particle structure enables the surface hardness of the cladding layer of the channel side prepared according to this invention to reach HRC 50-65.

[0014] The hard chromium carbide particles in the cladding layer limit the wear of the substrate. The higher the hardness, the greater the number of chromium carbide particles in the substrate, and the higher the wear resistance when the grain growth direction is perpendicular to the wear surface. Without the protection of the hard particle structure, large pieces of wear material will be generated when wear particles impact the substrate, resulting in wear. Conversely, when the substrate is protected by a cladding layer containing hard chromium carbide particles, only small pieces of wear material will be generated when impacted by wear particles, enhancing the wear resistance of the groove side.

[0015] Furthermore, prior to the cladding step, considering that directly cladding a wear-resistant layer onto the conventional tank side surface would reduce the scraper's passage space, increase scraper running resistance, and pose a risk of jamming, appropriate space was reserved at the cladding location during the casting mold design stage. The W-shaped groove size of the tank side was increased by 3-7mm to ensure matching with the scraper size. After the cladding process, finishing and grinding the cladding area ensures a smooth tank bottom, reduces frictional resistance, removes welding slag and fumes, and guarantees the quality of subsequent spraying.

[0016] The wear-resistant groove side processing method provided by this invention results in a smooth cladding layer surface. Furthermore, the cladding alters the wear mechanism, and the cladding layer contains large-particle chromium carbide, making it more wear-resistant and scratch-resistant. Moreover, it becomes increasingly smooth with wear over time without increasing wear on the scraper. Simultaneously, the cladding layer achieves a weld depth of 3-5 mm at the interface with the base material, exhibiting strong bonding strength up to 345 MPa. This invention solves the problem of inconsistent wear between the groove side, middle plate, and bottom plate under complex and harsh working conditions and high gangue content, demonstrating high practical value.

[0017] Preferably, in step two, the rough machining step is as follows: using the upper and lower chain tracks of the convex and concave ends as a reference, the groove blank is aligned perpendicular to the worktable; using the center M as a reference, the convex and concave ends are aligned horizontally to the worktable; and using the center M as a reference, the line connecting the centers M of the convex and concave ends is aligned perpendicular to the machine tool spindle; the center M is the center of the dumbbell pin socket.

[0018] More preferably, in step two, the roughing step further includes: taking the center of M as a reference, leaving a roughing layer with a margin of 3-5mm on the upper edge, middle plate edge, and bottom plate edge; re-clamping, taking the already machined surface as the fine machining reference, and machining the underside of the bottom plate edge.

[0019] After casting, the channel sides require rough machining. A 3-5mm allowance should be left along the top edge, middle plate edge, and bottom plate edge to facilitate finishing after cladding. Additionally, an allowance should be added under the bottom plate edge to provide a reference point for alignment during finishing after cladding. The purpose of rough machining of the channel sides is to provide a reference point for finishing after cladding, ensuring that the machined clad channel sides meet the drawing requirements. Ultimately, this provides a reference point for the welding of the central channel, guaranteeing the overall performance of the central channel.

[0020] It should be noted that the roughing method described in this invention is not limited to the method limited above. Those skilled in the art can use other commonly used roughing methods according to actual needs, as long as they do not affect the wear resistance of the groove side and ensure the benchmark during processing.

[0021] Preferably, the metal-cored welding wire is composed of the following components by mass percentage: 4.5-6.5% C, 0.5-2.5% Si, 22-35% Cr, 0.5-2.5% Mn, 0.1-0.25% Ni, 0.2-0.45% Mo, 0-0.28% S, 0-0.045% P, with the balance being Fe.

[0022] More preferably, the volume fraction of chromium carbide in the cladding layer formed in step three is 30-50%.

[0023] Preferably, the thickness of the cladding layer formed in step three is 5-7 mm. The specific cladding thickness defined by this invention can achieve the required hardness.

[0024] More preferably, in step three, the cladding step is specifically as follows:

[0025] S1. Fix the groove side upwards on the cladding workbench with a W-shaped groove, and find the level with the intersection line of the right groove inclined wall (5) and the right groove bottom transition surface (6) and the track of the cladding equipment.

[0026] S2. The right bottom transition surface (6) and the left bottom transition surface (2) of the channel side are cladding at an angle of 30mm, a welding speed of 260-280mm / min, a welding current of 480-540A, and a welding voltage of 33-40V.

[0027] S3. Rotate the groove side 90° so that the right outer vertical wall surface (7) is horizontal. According to the swing 70mm, the welding speed is 80-120mm / min, the welding current is 380-450A, and the welding voltage is 27-35V for cladding.

[0028] S4. Rotate the groove side 45° so that the left groove inclined wall (3) is horizontal. According to the swing 60mm, the welding speed is 150-190mm / min, the welding current is 480-550A, and the welding voltage is 33-42V for cladding.

[0029] S5. Rotate the groove side horizontally by 180° and then vertically by 135° to make the right groove inclined wall (5) horizontal. Follow the swing of 60mm, welding speed of 150-190mm / min, welding current of 480-550A, and welding voltage of 33-42V for cladding.

[0030] S6. Rotate the groove side 45° to make the inner side (4) of the upper flange of the right groove horizontal. According to the swing 60mm, the welding speed is 150-190mm / min, the welding current is 480-550A, and the welding voltage is 33-42V for cladding.

[0031] S7. Adjust the angle of the groove side so that the inner side (1) of the upper flange of the left groove is horizontal. According to the swing 55mm, the welding speed is 100-150mm / min, the welding current is 400-490A, and the welding voltage is 27-35V for cladding.

[0032] Based on the different widths of the cladding surface of the channel side, cladding surfaces of 50mm, 60mm, and 70mm widths are designed to obtain welding parameters corresponding to a cladding layer thickness of 5-7mm.

[0033] In the cladding layer formed using the specific processing method of this invention, the microstructure of the carbide hard particles has a grain growth direction perpendicular to the cladding surface, resulting in strong adhesion to the base material and significantly improving the wear resistance of the cladding layer. Furthermore, in the cladding experiments, cladding surfaces of 50mm, 60mm, and 70mm width were designed according to different cladding widths on the groove side. These specific cladding parameters can achieve the same cladding thickness for different cladding widths.

[0034] During the cladding process, the temperature field distribution of the molten pool affects the diffusion and segregation of alloying elements within the pool, thus influencing the solidification process. Fick's first law of diffusion, shown in equation (1-1), describes the diffusion process of solute atoms in relation to the diffusion coefficient D and the concentration gradient. The relationship between them. Equation (1-2) is the expression of the Arrhenius equation, which reflects the influence of the molten pool temperature on the atomic diffusion coefficient:

[0035]

[0036] Where: J—diffusion flux; D0—diffusion constant; τ—gas constant; Q—diffusion activation energy;

[0037] T—Molten pool temperature.

[0038] Combining Fick's first law of diffusion and Arrhenius's formula, we can obtain:

[0039]

[0040] As can be seen from equations (1-2) and (1-3), the temperature of the molten pool affects the diffusion and solidification process of alloying elements. Increasing the molten pool temperature is beneficial for accelerating the diffusion behavior of alloying elements. This invention controls energy input and optimizes heat source distribution through reasonable welding parameters: welding current, voltage, and oscillation amplitude, ensuring uniform distribution of alloying elements and guaranteeing the thickness and performance of the cladding layer.

[0041] Preferably, the finishing process in step four includes the following steps:

[0042] (I) Using the rough machining bottom surface after step two as the rough reference, level the mounting groove side, and use the upper surface of the middle plate as the reference to align the groove side horizontally, with the error of the convex and concave ends controlled within ±1mm.

[0043] (II) Using the bottom of the groove 100mm inward from both ends as a reference, align the upper and lower chain tracks at both ends vertically, with the error controlled within ±1mm; then, using the bottom of the groove 100mm inward from both ends as a reference, align the convex and concave ends of the groove side, with the error controlled within ±1mm.

[0044] (III) Machining the edge of the plate to ensure the dimensions T of the convex end measuring point and A of the concave end measuring point;

[0045] (Ⅳ) Machining the upper edge to ensure the dimensional value (L2-L1);

[0046] (V) Machining the bottom plate edge to ensure dimensions (L2-L3);

[0047] L1 is the length of the upper flange of the concave end, L2 is the length of the lower flange of the concave end, and L3 is the step length of the lower flange of the concave end.

[0048] More preferably, the dimension T of the convex end measuring point is calculated according to the following formula:

[0049] After obtaining the value, the tolerance is taken as the difference between the middle and lower bounds, T=(L2-Δ2), tolerance (0, -1);

[0050] The dimension A of the concave end measuring point is calculated according to the following formula:

[0051] After obtaining the value, the tolerance is taken as the difference between the middle and lower limits, A = (L2 - Δ1), and the tolerance is (-1, -2).

[0052] The overall fit dimensions of the central tank remain unchanged after the sidewalls are clad.

[0053] Secondly, the present invention provides a wear-resistant groove side, which is processed by the wear-resistant groove side processing method described above.

[0054] Thirdly, the present invention provides a scraper conveyor, comprising a wear-resistant groove obtained by the above-described method for processing wear-resistant grooves.

[0055] Preferably, in the scraper conveyor, the measuring point B at the convex end of the central trough is T×2+D, and the measuring point C at the concave end is A×2+D, where D is the width of the central plate;

[0056] As a preferred option, the welding of the middle plate requires an assembly gap of 2-4mm between the middle plate and the groove side, a tolerance of (-1, -3) for the middle plate D, a tolerance of (+2, 0) for the convex end measuring point B, and a tolerance of (0, -2) for the concave end measuring point C.

[0057] Therefore, this invention requires that T(0, -1) and A(-1, -2) be executed by the lower difference to ensure the assembly gap of the welding.

[0058] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0059] The wear-resistant groove side processing method provided by this invention significantly increases the wear resistance of the contact surface between the groove side and the scraper through a specific cladding process, making the groove side more wear-resistant and matching the wear resistance of the middle and bottom plates, thereby extending the overall service life of the equipment. Simultaneously, this invention, through the design of a suitable groove side casting mold, ensures that the scraper passage space is maintained after cladding, preventing further wear. The technical solution of this invention addresses the problem of inconsistent wear between the groove side, middle plate, and bottom plate under complex and harsh working conditions and high gangue content, which accelerates wear, and has high practical value. Attached Figure Description

[0060] Figure 1 This is a schematic diagram showing the design dimensions of the casting mold for processing the wear-resistant groove side of the present invention;

[0061] Figure 2 This is a schematic diagram of the cladding surface during the processing of the wear-resistant groove side of the present invention. The left side is a schematic diagram of each cladding surface when the W-shaped groove is fixed upward. The numbers in the figure are as follows: 1-inner side of the upper flange of the left groove, 2-transition surface of the bottom of the left groove, 3-sloping wall surface of the left groove, 4-inner side of the upper flange of the right groove, 5-sloping wall surface of the right groove, 6-transition surface of the bottom of the right groove, 7-outer vertical wall surface of the right groove; the right side is a schematic diagram of the cladding process.

[0062] Figure 3 A schematic diagram of the roughing layer reserved in the roughing step of the wear-resistant groove side of the present invention;

[0063] Figure 4 This is a schematic diagram of the cladding experiment in an embodiment of the wear-resistant groove side and its processing method of the present invention;

[0064] Figure 5 This is a SEM image of a cross-section of the cladding layer formed during the processing of the wear-resistant groove side of the present invention;

[0065] Figure 6 This is a schematic diagram of the finishing operation in the processing method of the wear-resistant groove side of the present invention;

[0066] Figure 7 This is a schematic diagram showing the dimensional parameters of the precision-machined concave and convex ends in the processing method of the wear-resistant groove side of the present invention;

[0067] Figure 8 This is a schematic diagram of the grinding operation in the processing method of the wear-resistant groove side of the present invention;

[0068] Figure 9 This is a perspective view of the middle trough structure of the scraper conveyor in an application example of the wear-resistant trough side of the present invention;

[0069] Figure 10 This is a cross-sectional view of the middle trough of a scraper conveyor in an application example of the wear-resistant trough side of the present invention;

[0070] Figure 11This is a top view of the middle trough of a scraper conveyor in an application example of the wear-resistant trough side of the present invention;

[0071] Figure 12 This is a top view of the middle plate of the scraper conveyor in an application example of the wear-resistant groove side of the present invention. Detailed Implementation

[0072] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments. Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods; the materials and reagents used, unless otherwise specified, are commercially available reagents and materials.

[0073] Example 1

[0074] One embodiment of the wear-resistant groove side and its processing method of the present invention, wherein the processing method of the wear-resistant groove side in this embodiment is as follows:

[0075] Step 1: Casting and forming. When designing the casting mold, based on the cladding surface, increase the size of the W-shaped groove by 5mm to leave space for cladding (e.g., Figure 1 As shown, the red portion of the conventional channel side is removed, and a channel side blank is obtained by casting; the cladding surface refers to the seven surfaces (1-7) where the channel side contacts the scraper, as shown. Figure 2 As shown;

[0076] Step 2: Rough machining of the groove blank: such as... Figure 3 As shown, where:

[0077] M is the center of the dumbbell pin socket. Using the upper and lower chain tracks of the convex and concave ends as references, the groove blank is made perpendicular to the worktable. Using center M as reference, the convex and concave ends are made horizontal to the worktable. Using center M as reference, the line connecting the centers M of the convex and concave ends is made perpendicular to the machine tool spindle.

[0078] Then, taking the center of M as the reference, leave a rough machining layer of 3-5mm margin on the upper edge, middle plate edge, and bottom plate edge to facilitate fine machining after cladding.

[0079] Reinstall the card slot, using the machined surface as the finishing reference, and machine the bottom plate along the underside.

[0080] Step 3: Apply metal-cored welding wire to the cladding surface to form a cladding layer;

[0081] The metal-cored welding wire is composed of the following components by mass percentage: 5.5% C, 1.5% Si, 30% Cr, 1.5% Mn, 0.18% Ni, 0.3% Mo, 0.1% S, 0.02% P, with the balance being Fe.

[0082] Conduct cladding tests (such as) Figure 4Based on the different widths of the cladding surface of the channel side, cladding surfaces with widths of 50mm, 60mm, and 70mm are designed to obtain welding parameters corresponding to a cladding layer thickness of 5-7mm.

[0083] The specific steps of the cladding method are as follows:

[0084] S1, such as Figure 2 As shown on the left, the groove side is fixed upward in a W-shaped groove on the cladding workbench, and the intersection of the right groove inclined wall (5) and the right groove bottom transition surface (6) is aligned with the track of the cladding equipment to find the level.

[0085] S2. The right bottom transition surface (6) and the left bottom transition surface (2) of the channel side are cladding at an angle of 30mm, a welding speed of 260-280mm / min, a welding current of 480-540A, and a welding voltage of 33-40V.

[0086] S3. Rotate the groove side 90° so that the right outer vertical wall surface (7) is horizontal. According to the swing 70mm, the welding speed is 80-120mm / min, the welding current is 380-450A, and the welding voltage is 27-35V for cladding.

[0087] S4. Rotate the groove side 45° so that the left groove inclined wall (3) is horizontal. According to the swing 60mm, the welding speed is 150-190mm / min, the welding current is 480-550A, and the welding voltage is 33-42V for cladding.

[0088] S5. Rotate the groove side horizontally by 180° and then vertically by 135° to make the right groove inclined wall (5) horizontal. Follow the swing of 60mm, welding speed of 150-190mm / min, welding current of 480-550A, and welding voltage of 33-42V for cladding.

[0089] S6. Rotate the groove side 45° to make the inner side (4) of the upper flange of the right groove horizontal. According to the swing 60mm, the welding speed is 150-190mm / min, the welding current is 480-550A, and the welding voltage is 33-42V for cladding.

[0090] S7. Adjust the angle of the groove side so that the inner side (1) of the upper flange of the left groove is horizontal. According to the swing 55mm, the welding speed is 100-150mm / min, the welding current is 400-490A, and the welding voltage is 27-35V for cladding.

[0091] The SEM image of the cross-section of the cladding layer after the cladding step is shown below. Figure 5 ,in Figure 5 (Left) shows the grain growth state parallel to the hard particles on the cladding surface, such as... Figure 5(Right) shows the grain growth state of hard particles perpendicular to the cladding surface. It can be seen that in the microstructure of the formed carbide hard particles, the grain growth direction is perpendicular to the cladding surface.

[0092] Step 4: First, perform finishing on the cladding groove sides, such as... Figure 6 , 7 As shown:

[0093] (I) Using the rough machining bottom surface after step two as the rough reference, level the mounting groove side, and use the upper surface of the middle plate as the reference to align the groove side horizontally, with the error of the convex and concave ends controlled within ±1mm.

[0094] (II) Using the bottom of the groove 100mm inward from both ends as a reference, align the upper and lower chain tracks at both ends vertically, with the error controlled within ±1mm; then, using the bottom of the groove 100mm inward from both ends as a reference, align the convex and concave ends of the groove side, with the error controlled within ±1mm.

[0095] (III) Machining the edge of the plate to ensure the dimensions T of the convex end measuring point and A of the concave end measuring point;

[0096] (Ⅳ) Machining the upper edge to ensure the dimensional value (L2-L1);

[0097] (V) Machining the bottom plate edge to ensure dimensions (L2-L3);

[0098] The dimension T of the convex end measuring point is calculated using the following formula:

[0099] After obtaining the value, the tolerance is taken as the difference between the middle and lower bounds, T=(L2-Δ2), tolerance (0, -1);

[0100] The dimension A of the concave end measuring point is calculated using the following formula:

[0101] After obtaining the value, the tolerance is taken as the difference between the middle and lower limits, A = (L2 - Δ1), and the tolerance is (-1, -2).

[0102] Finally, polishing is performed (e.g.) Figure 8 The wear-resistant groove is processed to obtain the wear-resistant groove.

[0103] Example 2

[0104] The only difference between Example 2 and Example 1 is that the composition ratio of the metal-cored welding wire is adjusted: the mass percentage of Cr is adjusted to 20%, the mass percentage of Mn is adjusted to 1%, the Fe ratio is adjusted accordingly, and the ratio of the remaining components remains unchanged.

[0105] Example 3

[0106] The only difference between Example 3 and Example 1 is that the composition ratio of the metal-cored welding wire is adjusted: the mass percentage of Cr is adjusted to 40%, the mass percentage of Mn is adjusted to 2%, and the Fe ratio is adjusted accordingly, while keeping the proportions of the remaining components unchanged.

[0107] Comparative Example 1

[0108] Comparative Example 1 is a common cast groove wall made of ZG30SiMn.

[0109] Example of effect

[0110] To investigate the wear resistance of the wear-resistant groove obtained by the processing method provided in this invention, the following tests were conducted:

[0111] Hardness of the cladding layer: The test method in GB / T 230.1-2018 was used as a reference, and the results are shown in Table 1.

[0112] Melt depth between cladding layer and base material: The cross-section of the cladding layer was observed using scanning electron microscopy to observe the melt depth, and the results are shown in Table 1;

[0113] Adhesion of the cladding layer: The test method of GB / T 44990-2024 was used as a reference, and the results are shown in Table 1.

[0114] Table 1 shows the test results of the cladding layer performance of the wear-resistant groove side in the embodiments.

[0115] Hardness (HRC) Penetration depth (mm) Bonding force (MPa) Example 1 58 4 343 Example 2 52 5 339 Example 3 64 3 345

[0116] As can be seen from the above embodiments 1-3, the wear-resistant groove obtained by the specific processing method provided by the present invention changes the wear mechanism after a specific cladding process. The cladding layer contains large particles of chromium carbide, which directly affects the hardness, bonding strength and other properties of the cladding layer. The surface hardness of the cladding layer reaches HRC 50-65, the cladding depth between the cladding layer and the base material can reach 3-5 mm, and the bonding strength can reach 345 MPa.

[0117] Application examples

[0118] An application example of the wear-resistant groove side and its processing method of the present invention is that the wear-resistant groove side obtained by the processing method in Example 1 is used to assemble the middle groove of a scraper conveyor, such as... Figure 9-12 As shown.

[0119] Depend on Figure 10 Cross-sectional view of the middle channel Figure 11 Top view of the central trough, and Figure 12 From the top view of the middle plate, we can obtain:

[0120] Convex end measuring point B = T × 2 + D, concave end measuring point C = A × 2 + D;

[0121] In this application example, the welding of the middle plate requires an assembly gap of 2-4mm between the middle plate and the groove side, a tolerance of (-1, -3) for the middle plate D, a tolerance of (+2, 0) for the convex end measuring point B, and a tolerance of (0, -2) for the concave end measuring point C. It is required that T(0, -1) and A(-1, -2) be executed with the lower tolerance to ensure the assembly gap of the welding.

[0122] The wear resistance of the wear-resistant groove obtained by the processing method in Example 1 in actual production of the scraper conveyor (taking a scraper height of 1.4 meters and a groove width of 800 mm as an example) is compared with the wear resistance of the ordinary cast groove ZG30SiMn in Comparative Example 1 in actual production of the scraper conveyor. Table 2 is shown below.

[0123] Table 2 Comparison of the application effects of wear-resistant grooves in Example 1 and Comparative Example 1

[0124]

[0125] As shown in Table 2, the wear-resistant trough prepared by the wear-resistant trough processing method provided by the present invention can significantly reduce the wear of the chain track when the scraper conveyor is used in actual transportation production compared with the traditional ordinary trough. The wear resistance is significantly improved, which helps to increase the service life of the equipment and reduce the production cost.

[0126] In summary, this invention provides a wear-resistant groove side and its processing method. The groove side prepared by the processing method and cladding process of this invention has a more wear-resistant and scratch-resistant contact surface with the scraper. Moreover, it becomes smoother with wear over a period of time without increasing wear on the scraper. While ensuring the scraper's passage space, it achieves a more wear-resistant groove side that matches the wear resistance of the middle and bottom plates. The overall fit dimensions of the middle groove remain unchanged after cladding. The technical solution of this invention solves the problem in the prior art where the wear amount of the groove side does not match that of the middle plate, and the groove side wears before the middle and bottom plates. It has high application value in scraper conveyors.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention 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 solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A method for processing wear-resistant groove sides, characterized in that, Includes the following steps: Step 1, Casting and Shaping: Based on the cladding surface, increase the size of the W-shaped groove by 3-7mm, leaving room for machining, and cast to obtain the groove blank; the cladding surface refers to the seven surfaces of the groove side that contact the scraper. Step 2: Roughly machine the groove blank; Step 3, Cladding: Use metal-cored welding wire to clad the cladding surface to form a cladding layer; The metal-cored welding wire is composed of the following components by mass percentage: 4.5-6.5% C, 0.5-2.5% Si, 20-40% Cr, 0.5-2.5% Mn, 0.1-0.25% Ni, 0.2-0.45% Mo, 0-0.28% S, 0-0.045% P, with the balance being Fe; Step 4: Perform fine machining and polishing on the cladding groove side to complete the processing of the wear-resistant groove side.

2. The processing method for the wear-resistant groove side as described in claim 1, characterized in that, In step two, the rough machining step is as follows: using the upper and lower chain tracks of the convex and concave ends as references, the groove blank is aligned perpendicular to the worktable; using center M as references, the convex and concave ends are aligned horizontally to the worktable; and using center M as references, the line connecting the centers M of the convex and concave ends is aligned perpendicular to the machine tool spindle; the center M is the center of the dumbbell pin socket.

3. The processing method for the wear-resistant groove side as described in claim 2, characterized in that, In step two, the roughing step also includes: taking the center of M as the reference, leaving a roughing layer with a margin of 3-5mm on the upper edge, middle plate edge, and bottom plate edge; re-clamping, taking the already machined surface as the fine machining reference, and machining the bottom edge.

4. The processing method for the wear-resistant groove side as described in claim 1, characterized in that, The metal-cored welding wire is composed of the following components by mass percentage: 4.5-6.5% C, 0.5-2.5% Si, 22-35% Cr, 0.5-2.5% Mn, 0.1-0.25% Ni, 0.2-0.45% Mo, 0-0.28% S, 0-0.045% P, with the balance being Fe.

5. The processing method for the wear-resistant groove side as described in claim 4, characterized in that, In the cladding layer formed in step three, the volume fraction of chromium carbide is 30-50%.

6. The processing method for the wear-resistant groove side as described in claim 1, characterized in that, The thickness of the cladding layer formed in step three is 5-7 mm.

7. The processing method for the wear-resistant groove side as described in claim 6, characterized in that, In step three, the cladding process is as follows: S1. Fix the groove side upwards on the cladding workbench with a W-shaped groove, and find the level with the intersection line of the right groove inclined wall (5) and the right groove bottom transition surface (6) and the track of the cladding equipment. S2. The right bottom transition surface (6) and the left bottom transition surface (2) of the channel side are cladding at an angle of 30mm, a welding speed of 260-280mm / min, a welding current of 480-540A, and a welding voltage of 33-40V. S3. Rotate the groove side 90° so that the right outer vertical wall surface (7) is horizontal. According to the swing 70mm, the welding speed is 80-120mm / min, the welding current is 380-450A, and the welding voltage is 27-35V for cladding. S4. Rotate the groove side 45° so that the left groove inclined wall (3) is horizontal. According to the swing 60mm, the welding speed is 150-190mm / min, the welding current is 480-550A, and the welding voltage is 33-42V for cladding. S5. Rotate the groove side horizontally by 180° and then vertically by 135° to make the right groove inclined wall (5) horizontal. Follow the swing of 60mm, welding speed of 150-190mm / min, welding current of 480-550A, and welding voltage of 33-42V for cladding. S6. Rotate the groove side 45° to make the inner side (4) of the upper flange of the right groove horizontal. According to the swing 60mm, the welding speed is 150-190mm / min, the welding current is 480-550A, and the welding voltage is 33-42V for cladding. S7. Adjust the angle of the groove side so that the inner side (1) of the upper flange of the left groove is horizontal. According to the swing 55mm, the welding speed is 100-150mm / min, the welding current is 400-490A, and the welding voltage is 27-35V for cladding.

8. The processing method of the wear-resistant groove side as described in claim 1, characterized in that, The specific steps of the finishing process in step four are as follows: (I) Using the rough machining bottom surface after step two as the rough reference, level the mounting groove side, and use the upper surface of the middle plate as the reference to align the groove side horizontally, with the error of the convex and concave ends controlled within ±1mm. (II) Using the bottom of the groove 100mm inward from both ends as a reference, align the upper and lower chain tracks at both ends vertically, with the error controlled within ±1mm; then, using the bottom of the groove 100mm inward from both ends as a reference, align the convex and concave ends of the groove side, with the error controlled within ±1mm. (III) Machining the edge of the plate to ensure the dimensions T of the convex end measuring point and A of the concave end measuring point; (Ⅳ) Machining the upper edge to ensure the dimensional value (L2-L1); (V) Machining the bottom plate edge to ensure dimensions (L2-L3); L1 is the length of the upper flange of the concave end, L2 is the length of the lower flange of the concave end, and L3 is the step length of the lower flange of the concave end.

9. The processing method of the wear-resistant groove side as described in claim 8, characterized in that, The dimension T of the convex end measuring point is calculated according to the following formula: After obtaining the value, the tolerance is taken as the difference between the middle and lower bounds, T=(L2-Δ2), tolerance (0, -1); The dimension A of the concave end measuring point is calculated according to the following formula: After obtaining the value, the tolerance is taken as the difference between the middle and lower limits, A = (L2 - Δ1), and the tolerance is (-1, -2).

10. A wear-resistant groove side, characterized in that, It is obtained by processing the wear-resistant groove side as described in any one of claims 1-9.

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