Scraper chain wheel chain nest repairing method

Abstract

The invention discloses a method for repairing a chain nest of a chain wheel of a scraper. The method comprises the following steps: S1, pretreatment; s2, preheating; s3, welding is conducted; s4, tempering treatment; s5, primary processing; s6, carrying out laser cladding on a wear-resistant layer; and S7, laser point alloying. The method has the advantages that compared with direct replacement of a new chain wheel, only a small amount of wear-resistant welding rods, alloy powder and labor cost need to be consumed, and the maintenance cost is greatly saved. By using the YH13 surfacing wear-resistant layer, the laser cladding wear-resistant layer and the dotted alloying treatment, the hardness of the chain nest of the repaired chain wheel can reach 54 HRC or above, the service life of the repaired chain wheel is effectively prolonged, the service cycle of the chain wheel is prolonged, and the shutdown maintenance frequency of equipment is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mine equipment machinery repair, and particularly relates to a scraper chain wheel chain nest repair method. BACKGROUND

[0002] The scraper conveyor is widely used in the field of coal enterprises and other fields, and the chain wheel bears the severe friction of the chain during operation. The chain wheel chain nest is the main wear part of the scraper chain wheel, and the failure of the chain wheel is caused by excessive wear of the gear teeth. At present, when the chain wheel has wear and other problems, if the new chain wheel is directly replaced, the price of each pair of double-row chain wheel is about 3,000 yuan, and the manufacturing cycle is about two months. There are problems of high replacement cost and long manufacturing cycle, which will seriously affect the production progress. Therefore, it has important practical significance to develop an efficient and low-cost scraper chain wheel repair method. SUMMARY

[0003] The present application relates to the technical field of mine equipment machinery repair, and particularly relates to a scraper chain wheel chain nest repair method.

[0004] The present application is implemented by the following technical solutions: a scraper chain wheel chain nest repair method, comprising the following steps: S1 pretreatment The chain wheel is pretreated to obtain a repaired chain wheel without impurities, oil stains and oxidation layer on the surface; S2 preheating The welding rod and the repaired chain wheel are respectively preheated for standby; S3 welding The repaired chain wheel is subjected to backing welding and build-up welding in sequence to obtain a first chain wheel. The thickness of the backing welding and the build-up welding is 4-6mm and 15-20mm respectively. The interlayer temperature of the build-up welding layer is measured by a spot temperature welding gun during the process. If the interlayer temperature is lower than 280℃, the preheating process of S2 needs to be repeated; S4 tempering treatment The first chain wheel is subjected to heat preservation at 400-450℃ for 4-5h, and then the heating is stopped, and the furnace is naturally cooled to below 100℃ to be discharged from the furnace to obtain a second chain wheel; S5 rough machining The outer circle and the chain nest of the second chain wheel are machined to the required size of the drawing, and then the chain nest is subjected to deep machining of 3-4mm to obtain a third chain wheel; S6 laser cladding wear-resistant layer HYF-1056 iron-based alloy powder is used for laser cladding on the chain nest of the third chain wheel to the required size of the drawing to obtain a fourth chain wheel; S7 laser point alloying The chain nest of the fourth chain wheel is subjected to laser point alloying process to obtain a repaired chain wheel.

[0005] Furthermore, the specific process of S1 is as follows: S1-1: First, remove rust from the sprocket; S1-2: Then, air gouge the sprocket teeth to remove the fatigue layer; S1-3: Finally, polish the surface of the sprocket teeth that needs to be repaired until it reveals a metallic luster, thus obtaining the sprocket to be repaired.

[0006] Furthermore, the preheating process of the welding electrode in S2 is as follows: the welding electrode is kept at 250-300℃ in a dryer for 1-2 hours.

[0007] Furthermore, the preheating process of the sprocket to be repaired in S2 is as follows: the sprocket to be repaired is kept at 400-450℃ in a drying oven for 3-5 hours.

[0008] Furthermore, in S3, the root pass welding uses a 147 welding rod with a diameter of 3.2mm; the overlay welding uses a YH13 flux-cored welding wire with a diameter of 1.6mm; the overlay welding current is 100-120A and the voltage is 22-24V.

[0009] Furthermore, in S6, the laser power of the laser cladding is 3000W, the spot diameter is 4mm, the powder feeding rate is 3g / s, and the cladding speed is 800mm / min.

[0010] Furthermore, in S6, the HYF-1056 iron-based alloy powder, by weight, includes the following elements: 20.25 parts Fe, 2.05 parts Ni, 16.69 parts Cr, 0.92 parts Mo, 1.14 parts Si, 0.17 parts C, 0.036 parts O, and 0.11 parts V.

[0011] Furthermore, the specific processing procedure of S7 is as follows: S7-1: Mix rare earth alloy powder, silicon dioxide and alcohol in a ratio of 1:0.5-1.5:1.5-2 to obtain a mud-like material; S7-2: Apply the mud-like material evenly to the surface of the chain socket, with a thickness of 0.5-1mm; S7-3: Laser dot alloying processing is performed on chain cavities coated with mud-like materials.

[0012] Furthermore, in S7-3, the laser power of the laser dot alloying process is 1500-2000W, the spot diameter is 3-6mm, and the cladding speed is 800-1000mm / min.

[0013] Furthermore, in S7-1, the rare earth alloy powder, by weight, consists of the following components: 4.23-6.52 parts rare earth, 0.86-3.63 parts Ni, 1.65-4.32 parts Cr, 0.29-2.36 parts Mo, 1.84-4.69 parts B, 0.32-2.66 parts C, 0.10-2.65 parts Zr, and 1.83-6.58 parts WC.

[0014] Furthermore, the rare earth elements are composed of the following components by weight: Ce 1.69-4.68 parts, La 0.81-3.72 parts, and Nd 0.61-3.64 parts.

[0015] Advantages of this invention: Compared to directly replacing the sprocket, this repair method requires only a small amount of wear-resistant welding rods, alloy powder, and labor costs, significantly reducing maintenance expenses. By using YH13 overlay welding, laser cladding of the wear-resistant layer, and dot-matrix alloying treatment, the hardness of the repaired sprocket's chain groove can reach above 54 HRC, and the average hardness of the sprocket teeth is significantly improved. This effectively extends the service life of the repaired sprocket, prolongs its service life, and reduces the number of times the equipment needs to be shut down for maintenance. Detailed Implementation

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0017] Example 1: A method for repairing sprocket sprocket sockets in a scraper conveyor, comprising the following steps: S1 Preprocessing The sprocket is pretreated to obtain a sprocket to be repaired with a surface free of impurities, oil stains, and oxide layers; the specific process of S1 is as follows: S1-1: First, remove rust from the sprocket; S1-2: Then, air gouge the sprocket teeth to remove the fatigue layer; S1-3: Finally, polish the surface of the sprocket teeth that needs to be repaired until it reveals a metallic luster, thus obtaining the sprocket to be repaired.

[0018] S2 preheating Both the welding rod and the sprocket to be repaired were preheated separately and set aside. Specifically, the preheating process of the welding electrode in S2 is as follows: the welding electrode is kept at 250-300℃ in a dryer for 1-2 hours.

[0019] The preheating process of the sprocket to be repaired in S2 is as follows: the sprocket to be repaired is kept at 400-450℃ in a drying oven for 3-5 hours.

[0020] S3 welding The tooth socket of the sprocket to be repaired is subjected to root welding and overlay welding in sequence to obtain the first sprocket; the thickness of the root welding and overlay welding is 5mm and 17mm respectively; during the process, the temperature between overlay welding layers is measured by a spot temperature welding gun. If the temperature between layers is lower than 280℃, the preheating process of S2 needs to be repeated. Specifically, the root pass welding uses 147 welding rods with a diameter of 3.2mm; the surfacing welding uses YH13 flux-cored welding wire with a diameter of 1.6mm; the surfacing welding current is 100-120A and the voltage is 22-24V.

[0021] S4 tempering treatment The first sprocket is kept at 400-450℃ for 4-5 hours, then heating is stopped, and it is allowed to cool naturally in the furnace to below 100℃ before being removed from the furnace to obtain the second sprocket. S5 Pre-processing First, the outer circle and chain groove of the second sprocket are machined to meet the dimensions required by the drawing. Then, the chain groove is machined by 3mm to obtain the third sprocket. S6 laser cladding wear-resistant layer The chain groove of the third sprocket was laser clad to the dimensions required by the drawing using HYF-1056 iron-based alloy powder to obtain the fourth sprocket. The laser power of the laser cladding was 3000W, the spot diameter was 4mm, the powder feed rate was 3g / s, and the cladding speed was 800mm / min.

[0022] HYF-1056 iron-based alloy powder, by weight, includes the following elements: Fe 20.25 parts, Ni 2.05 parts, Cr 16.69 parts, Mo 0.92 parts, Si 1.14 parts, C 0.17 parts, O 0.036 parts, and V 0.11 parts.

[0023] S7 Laser Dot Alloying The sprocket of the fourth sprocket was treated with laser dot alloying to obtain the repaired sprocket.

[0024] The specific processing procedure of S7 is as follows: S7-1: A mud-like material is obtained by mixing rare earth alloy powder, silicon dioxide, and alcohol in a ratio of 1:1:2.5. The rare earth alloy powder consists of the following components by weight: 5.26 parts rare earth, 1.96 parts Ni, 2.12 parts Cr, 0.86 parts Mo, 3.5 parts B, 0.45 parts C, 0.16 parts Zr, and 4.25 parts WC. The rare earth component consists of the following components by weight: 2.03 parts Ce, 1.26 parts La, and 1.97 parts Nd.

[0025] S7-2: Apply the mud-like material evenly to the surface of the chain socket, with a thickness of 0.5-1mm; S7-3: Laser dot alloying processing is performed on the chain nest coated with mud-like material; the laser power for laser dot alloying processing is 1500-2000W, the spot diameter is 3-6mm, and the cladding speed is 800-1000mm / min.

[0026] Example 2: It is the same as Example 1 in general, except that in S3, the thickness of the root pass welding and the overlay welding are 4mm and 20mm respectively; in S5, the chain socket is deep-processed to 4mm; in S7-1, rare earth alloy powder, silicon dioxide and alcohol are mixed in a ratio of 1:1.5:2 to obtain a mud-like material; the rare earth alloy powder is composed of the following components by weight: 4.23 parts rare earth, 3.63 parts Ni, 1.65 parts Cr, 0.29 parts Mo, 1.84 parts B, 0.32 parts C, 0.1 parts Zr, and 1.83 parts WC; wherein, the rare earth is composed of the following components by weight: 1.69 parts Ce, 0.81 parts La, and 0.61 parts Nd.

[0027] Example 3: It is the same as Example 1 in general, except that in S3, the thickness of the root pass welding and the overlay welding are 6mm and 15mm respectively; in S5, the chain socket is deep-processed to 3.5mm; in S7-1, rare earth alloy powder, silicon dioxide and alcohol are mixed in a ratio of 1:0.5:1.5 to obtain a mud-like material; the rare earth alloy powder is composed of the following components by weight: 6.52 parts rare earth, 0.86 parts Ni, 4.32 parts Cr, 2.36 parts Mo, 4.69 parts B, 2.66 parts C, 2.65 parts Zr, and 6.58 parts WC; wherein, the rare earth is composed of the following components by weight: 4.68 parts Ce, 3.72 parts La, and 3.64 parts Nd.

[0028] Comparative Example 1: A method for repairing the sprocket sprocket socket of a scraper conveyor, comprising the following steps: S1 Preprocessing The sprocket is pretreated to obtain a sprocket to be repaired with a surface free of impurities, oil stains, and oxide layers; the specific process of S1 is as follows: S1-1: First, remove rust from the sprocket; S1-2: Then, air gouge the sprocket teeth to remove the fatigue layer; S1-3: Finally, polish the surface of the sprocket teeth that needs to be repaired until it reveals a metallic luster, thus obtaining the sprocket to be repaired.

[0029] S2 preheating Both the welding rod and the sprocket to be repaired were preheated separately and set aside. Specifically, the preheating process of the welding electrode in S2 is as follows: the welding electrode is kept at 250-300℃ in a dryer for 1-2 hours.

[0030] The preheating process of the sprocket to be repaired in S2 is as follows: the sprocket to be repaired is kept at 400-450℃ in a drying oven for 3-5 hours.

[0031] S3 welding The tooth socket of the sprocket to be repaired is subjected to root welding and overlay welding in sequence to obtain the first sprocket; the thickness of the root welding and overlay welding is 5-6mm and 15-17mm respectively; during the process, the temperature between overlay welding layers is measured by a spot temperature welding gun. If the temperature between layers is lower than 280℃, the preheating process of S2 needs to be repeated. Specifically, the root pass welding uses 147 welding rods with a diameter of 3.2mm; the surfacing welding uses YH13 flux-cored welding wire with a diameter of 1.6mm; the surfacing welding current is 100-120A and the voltage is 22-24V.

[0032] S4 tempering treatment The first sprocket is kept at 400-450℃ for 4-5 hours, then heating is stopped, and it is allowed to cool naturally in the furnace to below 100℃ before being removed from the furnace to obtain the second sprocket. S5 Pre-processing First, the outer circle and chain groove of the second sprocket are machined to meet the dimensions required by the drawing. Then, the chain groove is machined by 3mm to obtain the third sprocket. S6 laser cladding wear-resistant layer The chain groove of the third sprocket was laser clad to the dimensions required by the drawing using HYF-1056 iron-based alloy powder to obtain the fourth sprocket. The laser power of the laser cladding was 3000W, the spot diameter was 4mm, the powder feed rate was 3g / s, and the cladding speed was 800mm / min.

[0033] HYF-1056 iron-based alloy powder, by weight, comprises the following elements: Fe 20.25 parts, Ni 2.05 parts, Cr 16.69 parts, Mo 0.92 parts, Si 1.14 parts, C 0.17 parts, O 0.036 parts, and V 0.11 parts. The rare earth elements, by weight, consist of the following components: Cerium (Ce) 2.03 parts, La 1.26 parts, and Nd 1.97 parts.

[0034] Comparative Example 2: A method for repairing sprocket sprocket sockets in a scraper conveyor, comprising the following steps: S1 Preprocessing The sprocket is pretreated to obtain a sprocket to be repaired with a surface free of impurities, oil stains, and oxide layers; the specific process of S1 is as follows: S1-1: First, remove rust from the sprocket; S1-2: Then, air gouge the sprocket teeth to remove the fatigue layer; S1-3: Finally, polish the surface of the sprocket teeth that needs to be repaired until it reveals a metallic luster, thus obtaining the sprocket to be repaired.

[0035] S2 preheating Both the welding rod and the sprocket to be repaired were preheated separately and set aside. Specifically, the preheating process of the welding electrode in S2 is as follows: the welding electrode is kept at 250-300℃ in a dryer for 1-2 hours.

[0036] The preheating process of the sprocket to be repaired in S2 is as follows: the sprocket to be repaired is kept at 400-450℃ in a drying oven for 3-5 hours.

[0037] S3 Pre-processing First, the outer circle and chain groove of the second sprocket are machined to meet the dimensions required by the drawing. Then, the chain groove is machined by 3mm to obtain the third sprocket. S4 laser cladding wear-resistant layer The chain groove of the third sprocket was laser clad to the dimensions required by the drawing using HYF-1056 iron-based alloy powder to obtain the fourth sprocket. The laser power of the laser cladding was 3000W, the spot diameter was 4mm, the powder feed rate was 3g / s, and the cladding speed was 800mm / min.

[0038] HYF-1056 iron-based alloy powder, by weight, includes the following elements: Fe 20.25 parts, Ni 2.05 parts, Cr 16.69 parts, Mo 0.92 parts, Si 1.14 parts, C 0.17 parts, O 0.036 parts, and V 0.11 parts.

[0039] S5 laser dot alloying The sprocket of the fourth sprocket was treated with laser dot alloying to obtain the repaired sprocket.

[0040] The specific processing procedure of S7 is as follows: S7-1: A mud-like material is obtained by mixing rare earth alloy powder, silicon dioxide, and alcohol in a ratio of 1:1:2.5. The rare earth alloy powder consists of the following components by weight: 5.26 parts rare earth, 1.96 parts Ni, 2.12 parts Cr, 0.86 parts Mo, 3.5 parts B, 0.45 parts C, 0.16 parts Zr, and 4.25 parts WC. The rare earth component consists of the following components by weight: 2.03 parts Ce, 1.26 parts La, and 1.97 parts Nd.

[0041] S7-2: Apply the mud-like material evenly to the surface of the chain socket, with a thickness of 0.5-1mm; S7-3: Laser dot alloying processing is performed on the chain nest coated with mud-like material; the laser power for laser dot alloying processing is 1500-2000W, the spot diameter is 3-6mm, and the cladding speed is 800-1000mm / min.

[0042] Comparative Example 3: A method for repairing the sprocket sprocket socket of a scraper conveyor, comprising the following steps: S1 Preprocessing The sprocket is pretreated to obtain a sprocket to be repaired with a surface free of impurities, oil stains, and oxide layers; the specific process of S1 is as follows: S1-1: First, remove rust from the sprocket; S1-2: Then, air gouge the sprocket teeth to remove the fatigue layer; S1-3: Finally, polish the surface of the sprocket teeth that needs to be repaired until it reveals a metallic luster, thus obtaining the sprocket to be repaired.

[0043] S2 preheating Both the welding rod and the sprocket to be repaired were preheated separately and set aside. Specifically, the preheating process of the welding electrode in S2 is as follows: the welding electrode is kept at 250-300℃ in a dryer for 1-2 hours.

[0044] The preheating process of the sprocket to be repaired in S2 is as follows: the sprocket to be repaired is kept at 400-450℃ in a drying oven for 3-5 hours.

[0045] S3 welding The tooth socket of the sprocket to be repaired is subjected to root welding and overlay welding in sequence to obtain the first sprocket; the thickness of the root welding and overlay welding is 5mm and 17mm respectively; during the process, the temperature between overlay welding layers is measured by a spot temperature welding gun. If the temperature between layers is lower than 280℃, the preheating process of S2 needs to be repeated. Specifically, the root pass welding uses 147 welding rods with a diameter of 3.2mm; the surfacing welding uses YH13 flux-cored welding wire with a diameter of 1.6mm; the surfacing welding current is 100-120A and the voltage is 22-24V.

[0046] S4 tempering treatment The first sprocket is kept at 400-450℃ for 4-5 hours, then heating is stopped, and it is allowed to cool naturally in the furnace to below 100℃ before being removed from the furnace to obtain the second sprocket. S5 Pre-processing First, the outer circle and chain groove of the second sprocket are machined to meet the dimensions required by the drawing. Then, the chain groove is machined by 3mm to obtain the third sprocket. S6 laser cladding wear-resistant layer The chain groove of the third sprocket was laser clad to the dimensions required by the drawing using HYF-1056 iron-based alloy powder to obtain the fourth sprocket. The laser power of the laser cladding was 3000W, the spot diameter was 4mm, the powder feed rate was 3g / s, and the cladding speed was 800mm / min.

[0047] HYF-1056 iron-based alloy powder, by weight, includes the following elements: Fe 20.25 parts, Ni 2.05 parts, Cr 16.69 parts, Mo 0.92 parts, Si 1.14 parts, C 0.17 parts, O 0.036 parts, and V 0.11 parts.

[0048] S7 Laser Dot Alloying The sprocket of the fourth sprocket was treated with laser dot alloying to obtain the repaired sprocket.

[0049] The specific processing procedure of S7 is as follows: S7-1: Prepare alloy powder according to the following proportions: 2% chromium, 4% boron, 4% silicon, 1% carbon, 3% iron, 30% tungsten carbide, with the balance being nickel.

[0050] S7-2: Apply the prepared alloy powder evenly to the surface of the chain socket, with a coating thickness of 0.5-1mm; S7-3: Laser dot alloying is performed on the chain nest coated with alloy powder; the laser power for laser dot alloying is 1500-2000W, the spot diameter is 3-6mm, and the cladding speed is 800-1000mm / min.

[0051] Experiments were conducted on the hardness and service life of the sprockets repaired in Examples 1 to 3 and Comparative Examples 1 to 3. The experimental results are as follows:

[0052] Experimental analysis showed that the gear hardness and service life of the sprockets repaired in Examples 1 to 3 were superior to those in Comparative Examples 1 to 3, and also superior to the factory settings of the sprockets. The innovation of this invention lies in the following: after pretreatment and preheating of the sprocket, a method of first performing a root pass followed by a surfacing pass is used in the welding stage, followed by tempering. In the initial machining stage after tempering, the sprocket teeth are machined to the dimensions required by the drawings, and then the chain groove is further machined to leave allowance for the subsequent laser cladding process. A wear-resistant layer is then applied using laser cladding to enhance wear resistance. Finally, a mud-like material is prepared by mixing rare earth alloy powder, silicon dioxide, and alcohol in a certain proportion and applied to the surface of the chain groove, followed by laser dot-matrix alloying treatment, which further improves the wear resistance of the sprocket teeth. In summary, the sprockets repaired using this method show a significant improvement in the hardness of the sprocket teeth, extending the service life of the sprocket, reducing the number of equipment downtimes for maintenance, and providing a guarantee and favorable technical support for coal mining enterprises to increase production and efficiency.

Claims

1. A method for repairing sprocket sprocket sockets in a scraper conveyor, characterized in that, It includes the following steps: S1 Preprocessing The sprocket is pretreated to obtain a sprocket to be repaired with no impurities, oil stains and oxide layer on the surface; S2 preheating Both the welding rod and the sprocket to be repaired were preheated separately and set aside. S3 welding The tooth recess of the sprocket to be repaired is successively subjected to root welding and overlay welding to obtain the first sprocket; The thicknesses for the root pass and the overlay are 4-6mm and 15-20mm, respectively; During the process, the interlayer temperature of the weld is measured using a spot-heated welding gun. If the interlayer temperature is lower than 280℃, the preheating process of S2 needs to be repeated. S4 tempering treatment The first sprocket is kept at 400-450℃ for 4-5 hours, then heating is stopped, and it is allowed to cool naturally in the furnace to below 100℃ before being removed from the furnace to obtain the second sprocket. S5 Pre-processing First, the outer circle and chain groove of the second sprocket are machined to meet the dimensions required by the drawing. Then, the chain groove is machined 3-4mm deep to obtain the third sprocket. S6 laser cladding wear-resistant layer The chain groove of the third sprocket was laser-clad to the dimensions required by the drawing using HYF-1056 iron-based alloy powder to obtain the fourth sprocket; S7 Laser Dot Alloying The sprocket of the fourth sprocket was treated with laser dot alloying to obtain the repaired sprocket.

2. The method for repairing the sprocket chain groove of a scraper conveyor according to claim 1, characterized in that, The specific process of S1 is as follows: S1-1: First, remove rust from the sprocket; S1-2: Then, air gouge the sprocket teeth to remove the fatigue layer; S1-3: Finally, polish the surface of the sprocket teeth that needs to be repaired until it reveals a metallic luster, thus obtaining the sprocket to be repaired.

3. The method for repairing the sprocket chain socket of a scraper conveyor according to claim 1, characterized in that, The preheating process for the welding electrode in S2 is as follows: the welding electrode is kept at 250-300℃ in a dryer for 1-2 hours.

4. The method for repairing the sprocket chain groove of a scraper conveyor according to claim 1, characterized in that, The preheating process of the sprocket to be repaired in S2 is as follows: the sprocket to be repaired is kept at 400-450℃ in a drying oven for 3-5 hours.

5. The method for repairing the sprocket socket of a scraper conveyor according to claim 1, characterized in that, In S3, the root pass welding uses a 147 welding rod with a diameter of 3.2mm; the overlay welding uses a YH13 flux-cored welding wire with a diameter of 1.6mm; the overlay welding current is 100-120A and the voltage is 22-24V.

6. The method for repairing the sprocket socket of a scraper conveyor according to claim 1, characterized in that, In S6, the laser power of laser cladding is 3000W, the spot diameter is 4mm, the powder feeding rate is 3g / s, and the cladding speed is 800mm / min.

7. The method for repairing the sprocket chain groove of a scraper conveyor according to claim 1, characterized in that, In S6, the HYF-1056 iron-based alloy powder, by weight, includes the following elements: Fe 20.25 parts, Ni 2.05 parts, Cr 16.69 parts, Mo 0.92 parts, Si 1.14 parts, C 0.17 parts, O 0.036 parts, and V 0.11 parts.

8. The method for repairing the sprocket chain groove of a scraper conveyor according to claim 1, characterized in that, The specific processing procedure of S7 is as follows: S7-1: Mix rare earth alloy powder, silicon dioxide and alcohol in a ratio of 1:0.5-1.5:1.5-2 to obtain a mud-like material; S7-2: Apply the mud-like material evenly to the surface of the chain socket, with a thickness of 0.5-1mm; S7-3: Laser dot alloying processing is performed on chain cavities coated with mud-like materials.

9. A method for repairing sprocket sprocket sockets in a scraper conveyor according to claim 8, characterized in that, In S7-3, the laser power for laser dot alloying is 1500-2000W, the spot diameter is 3-6mm, and the cladding speed is 800-1000mm / min.

10. A method for repairing sprocket sprocket sockets in a scraper conveyor according to claim 8, characterized in that, In S7-1, the rare earth alloy powder, by weight, consists of the following components: Composition: Rare earth 4.23-6.52 parts, Ni 0.86-3.63 parts, Cr 1.65-4.32 parts, Mo 0.29-2.36 parts, B 1.84-4.69 parts, C 0.32-2.66 parts, Zr 0.10-2.65 parts, WC 1.83-6.58 parts.

11. A method for repairing sprocket sprocket sockets in a scraper conveyor according to claim 10, characterized in that, The rare earth elements, by weight, consist of the following components: Composition: Ce 1.69-4.68 parts, La 0.81-3.72 parts, Nd 0.61-3.64 parts.

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