Sectional surfacing method for roll surface of four-roll crusher

Abstract

The invention discloses a four-roll crusher roll surface segmented surfacing method which comprises the following steps: S1, cleaning: cleaning the roll surfaces of a driving roll and a driven roll to ensure that no oil stain and oxide skin exist; s2, surfacing of areas on the two sides is conducted, specifically, surfacing is conducted on the areas on the two sides of the driving roller and the driven roller through a low-hardness and good-abrasion-resistance material, hard welding layers are formed, and the low-hardness and good-abrasion-resistance material is medium-low-carbon tool steel or martensitic stainless steel; and S3, middle area surfacing is conducted, specifically, surfacing is conducted on the middle area of the driving roller and the middle area of the driven roller through a high-hardness wear-resistant material, a hard welding layer is formed, and the high-hardness wear-resistant material is medium-high carbon tool steel or high-carbon high-chromium alloy. Through the mode, the roller surface with high hardness in the middle area and low hardness in the two end areas is designed, so that the balanced wear of the roller surface is realized, the crushing efficiency is improved, the service life of equipment is prolonged, and remarkable technical and economic benefits are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of crushers, in particular to a segmented surfacing method for roller surfaces of a four-roll crusher. Background Art

[0002] Four-roll crusher is widely used in coal, ore, building materials and other fields. Its main working principle is to crush materials through the relative movement of four crushing rollers. Usually, the materials of the four-roll crusher are mainly discharged from the middle, so the middle area is subject to greater wear, while the wear on both ends is relatively less. With the increase of use time, the wear in the middle area will cause the gap between the rollers to increase, which will affect the particle size of the output and the crushing efficiency.

[0003] At present, the repair method for worn roller surfaces is to perform surfacing welding on the entire roller surface. The existing four-roller crusher roller surface surfacing technology has the following main problems: (1) Uneven wear: The degree of wear of different areas of the roller surface is still different, the middle area wears faster, and the two ends wear slowly, resulting in a shortened service life of the roller surface; (2) High surfacing cost: The use of overall high-hardness surfacing increases material costs and processing difficulty; (3) Inconvenient maintenance: After the roller surface is worn, it needs to be repaired as a whole, which has high maintenance costs and affects production efficiency.

[0004] Based on the above defects and shortcomings, it is necessary to improve the existing technology and design a segmented surfacing method for the roller surface of a four-roll crusher. Summary of the invention

[0005] The main technical problem solved by the present invention is to provide a segmented surfacing method for the roller surface of a four-roll crusher. By designing the roller surface with high hardness in the middle area and low hardness in the two end areas, balanced wear of the roller surface is achieved, the crushing efficiency is improved, the service life of the equipment is extended, and significant technical and economic benefits are achieved.

[0006] In order to solve the above technical problems, a technical solution adopted by the present invention is to provide a segmented surfacing method for the roller surface of a four-roll crusher, comprising the following steps:

[0007] S1. Clean the surfaces of the active roller and the driven roller to ensure that there is no oil stain and oxide scale;

[0008] S2, surfacing welding on both sides: using materials with low hardness and good wear resistance to surfacing welding on both sides of the active roller and the driven roller to form a hard welding layer. The materials with low hardness and good wear resistance are medium-low carbon tool steel or martensitic stainless steel;

[0009] S3. Overlay welding in the middle area: high hardness and wear-resistant materials are used to overlay welding on the middle area between the active roller and the driven roller to form a hard welding layer. The high hardness and wear-resistant materials are medium-high carbon tool steel or high-carbon high-chromium alloy.

[0010] Preferably, in step S2, 2Cr13 martensitic stainless steel hard facing material with lower hardness is used to build up welding on the areas on both sides of the active roller to form a main soft welding layer; 1Cr13 martensitic stainless steel hard facing material with lower hardness is used to build up welding on the areas on both sides of the driven roller to form a secondary soft welding layer; in step S3, high-carbon high-chromium alloy material is used to build up welding on the middle area of ​​the active roller to form a main hard welding layer; medium-carbon tool steel material is used to build up welding on the middle area of ​​the driven roller to form a secondary hard welding layer.

[0011] Preferably, in step S2, the hardness of the main soft solder layer is 45-52 HRC, and the hardness of the secondary soft solder layer is 37-45 HRC.

[0012] Preferably, in step S3, the hardness of the main hard soldering layer is 53-60 HRC, and the hardness of the secondary hard soldering layer is 48-55 HRC.

[0013] Preferably, the width of the areas on both sides of the active roller and the driven roller is 50-150 mm.

[0014] Preferably, in step S2, the cross-section of the soft solder layer is a trapezoid that is wide at the bottom and narrow at the top, and in step S3, the cross-section of the hard solder layer is a trapezoid that is narrow at the bottom and wide at the top. The soft solder layer is at the bottom at the junction of the soft solder layer and the hard solder layer, and usually the softer solder layer should be at the bottom to ensure that cracks are not prone to occur at the junction of the two materials. If the softer solder layer is at the top, the softer solder layer will shrink when it cools from high temperature after welding, and the shrinkage will be larger, which can easily tear the hard surface layer with higher hardness and poorer toughness below near the heat affected zone, and then cause it to peel off.

[0015] Preferably, the connection angle between the soft solder layer and the hard solder layer is 45° to 60°.

[0016] Preferably, the thickness of the welding layer in steps S2 and S3 is 20 to 40 mm on one side. Too thick a build-up welding thickness will not only increase the cost, but also exceed the adjustable range of the distance between the two rollers of the equipment (to control the particle size of the output material).

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] Extended service life: The high hardness design of the middle area effectively resists concentrated wear and extends the service life of the roller surface;

[0019] Balanced wear: The hardness of the two end areas is reduced, which is more consistent with the wear rate of the middle area, avoiding the increase of the crushing gap due to uneven wear, and reducing the workload of grinding the roller surface to ensure the roller surface gap in the later stage;

[0020] Improve crushing efficiency: Maintain appropriate crushing gap to ensure stable output particle size and improve crushing efficiency;

[0021] Reduce maintenance costs: Reduce frequent maintenance and replacement, saving operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the roller surface of a four-roll crusher.

[0023] Figure 2 It is a schematic diagram of the structure of the active roller.

[0024] Figure 3 It is a schematic diagram of the cross section of the active roller.

[0025] Figure 4 It is a schematic diagram of the structure of the driven roller.

[0026] Among them, 1, active roller, 11, main soft soldering layer, 12, main hard soldering layer;

[0027] 2. driven roller, 21. from soft soldering layer, 22. from hard soldering layer. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0029] See also Figures 1 to 4 , the embodiment of the present invention includes:

[0030] A method for surfacing the roller surface of a four-roll crusher in sections, the method comprising the following steps:

[0031] S1. Clean the surfaces of the active roller 1 and the driven roller 2 to ensure that there is no oil stain or oxide scale.

[0032] S2, surfacing welding on both sides of the active roller 1, using 2Cr13 martensitic stainless steel hard facing material with lower hardness to surfacing weld the two sides of the active roller 1, forming a main soft welding layer 11, the hardness of the middle main soft welding layer 11 is 45-52HRC; using 1Cr13 martensitic stainless steel hard facing material with lower hardness to surfacing weld the two sides of the driven roller 2, forming a secondary soft welding layer 21, the hardness of the secondary soft welding layer 21 is 37-45HRC;

[0033] S3, surfacing welding in the middle area, using high carbon and high chromium alloy materials to surfacing welding the middle area of ​​the active roller 1 to form a main hard welding layer 12, the hardness of the main hard welding layer 12 is 53-60HRC; using medium carbon tool steel materials to surfacing welding the middle area of ​​the driven roller 2 to form a secondary hard welding layer 22, the hardness of the secondary hard welding layer 22 is 48-55HRC.

[0034] The width of the areas on both sides of the active roller 1 and the driven roller 2 is 100 mm.

[0035] In step S2, the cross-section of the main and secondary soft welding layers is a trapezoid that is wide at the bottom and narrow at the top. In step S3, the cross-section of the main and secondary hard welding layers is a trapezoid that is narrow at the bottom and wide at the top. The soft welding layer is at the bottom at the junction of the soft welding layer and the hard welding layer. Usually, the softer welding layer should be at the bottom to ensure that cracks are not easy to occur at the junction of the two materials. If the softer welding layer is at the top, the softer welding layer will shrink when it cools from high temperature after welding. The shrinkage is large, and it is easy to tear the hard surface layer with higher hardness and poorer toughness below from the vicinity of the heat affected zone, and then it is easy to peel off. The connection surface angle of the main and secondary soft welding layers and the main and secondary hard welding layers is 45°~60°.

[0036] In steps S2 and S3, the thickness of the welding layer is 20 to 40 mm on one side. If the thickness of the cladding is too thick, in addition to increasing the cost, it will also exceed the adjustable range of the distance between the two rollers of the equipment (to control the particle size of the discharge material).

[0037] The present invention discloses a segmented surfacing method for roller surface of a four-roll crusher. By designing the roller surface with high hardness in the middle area and low hardness in the two end areas, balanced wear of the roller surface is achieved, crushing efficiency is improved, and service life of the equipment is extended, thereby having significant technical and economic benefits.

[0038] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for sectional surfacing of roller surface of a four-roll crusher, characterized in that: The following steps are involved: S1. Clean the surfaces of the active roller and the driven roller to ensure that there is no oil stain and oxide scale; S2, surfacing welding on both sides: using materials with low hardness and good wear resistance to surfacing welding on both sides of the active roller and the driven roller to form a hard welding layer. The materials with low hardness and good wear resistance are medium-low carbon tool steel or martensitic stainless steel; S3. Overlay welding in the middle area: high hardness and wear-resistant materials are used to overlay welding on the middle area between the active roller and the driven roller to form a hard welding layer. The high hardness and wear-resistant materials are medium-high carbon tool steel or high-carbon high-chromium alloy.

2. The method for sectional surfacing of the roller surface of a four-roll crusher according to claim 1 is characterized in that: In step S2, 2Cr13 martensitic stainless steel hard facing material with lower hardness is used to build up welding on the areas on both sides of the active roller to form a main soft welding layer; 1Cr13 martensitic stainless steel hard facing material with lower hardness is used to build up welding on the areas on both sides of the driven roller to form a secondary soft welding layer; in step S3, high-carbon high-chromium alloy material is used to build up welding on the middle area of ​​the active roller to form a main hard welding layer; medium-carbon tool steel material is used to build up welding on the middle area of ​​the driven roller to form a secondary hard welding layer.

3. The method for sectional surfacing of the roller surface of a four-roll crusher according to claim 2 is characterized in that: In step S2, the hardness of the main soft solder layer is 45-52 HRC, and the hardness of the secondary soft solder layer is 37-45 HRC.

4. The method for sectional surfacing of the roller surface of a four-roll crusher according to claim 2 is characterized in that: In step S3, the hardness of the main hard soldering layer is 53-60 HRC, and the hardness of the secondary hard soldering layer is 48-55 HRC.

5. The method for sectional surfacing of the roller surface of a four-roll crusher according to claim 1 is characterized in that: The width of the areas on both sides of the active roller and the driven roller is 50 to 150 mm.

6. The method for sectional surfacing of the roller surface of a four-roll crusher according to claim 1, characterized in that: In step S2, the cross section of the soft solder layer is a trapezoid that is wide at the bottom and narrow at the top. In step S3, the cross section of the hard solder layer is a trapezoid that is narrow at the bottom and wide at the top. The soft solder layer is at the bottom at the junction of the soft solder layer and the hard solder layer.

7. The method for sectional surfacing of the roller surface of a four-roll crusher according to claim 6, characterized in that: The connection angle between the soft soldering layer and the hard soldering layer is 45° to 60°.

8. The method for sectional surfacing of the roller surface of a four-roll crusher according to claim 1, characterized in that: In steps S2 and S3, the thickness of the welding layer is 20 to 40 mm on one side.

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