Middle trough for thin coal seam scraper conveyor and manufacturing method therefor
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- NINGXIA TIANDI BENNIU IND GRP
- Filing Date
- 2025-12-12
- Publication Date
- 2026-06-25
Smart Images
Figure CN2025142254_25062026_PF_FP_ABST
Abstract
Description
The intermediate trough for thin coal seam scraper conveyor and its manufacturing method Technical Field
[0001] This invention relates to the field of coal mine machinery and equipment technology, and in particular to a central trough for a thin coal seam scraper conveyor and its manufacturing method. Background Technology
[0002] Scraper conveyors are the main transportation equipment in underground coal mining faces. The central trough, as the core component and main part of the scraper conveyor, has a structure whose rationality affects the service life of the scraper conveyor. When the scraper conveyor is working in thin coal seams, the working space is limited, so the height of the central trough needs to be reduced. This reduces the welding space of the central trough, increases the difficulty of welding operations, reduces the welding quality, and affects the carrying capacity and service life of the central trough. At the same time, due to the different welding properties between different materials, the welding internal stress cannot be eliminated, making the middle plate and bottom plate of the central trough prone to detachment or breakage, affecting the normal use of the scraper conveyor, and even causing production stoppage.
[0003] To address the aforementioned technical problems, the technical solution disclosed in the Chinese Utility Model Patent Application No. CN201320485173.8 is a multi-channel, integrally cast, wear-resistant central trough. This invention solves the problem of integrating the transport chain channel, the transport chain of the chain-driven coal mining system, and the moving cable channel of the coal mining machine's towing cable system during operation. It includes a central trough body, with chain-driven coal mining machine skid tracks on the upper sides of both sides. The upper and lower sections of the central trough body are respectively the upper and lower channels for the transport chain. The left side of the central trough body contains two layers of moving cable channels for the towing cable system, with a support pushing and connecting device on the outside of these channels. The right side of the central trough body contains the lower and upper channels for the traction chain, and a coal shovel plate is located at the bottom right side of the central trough body. This invention's integral casting method reduces the welding space required for welding equipment, making the equipment structure more compact and lowering the overall height. The equipment can be widely used in medium-thick coal seams and even thin coal seams.
[0004] However, the above-mentioned existing technology has the following technical problems: the lower channel and the upper channel of the traction chain of the multi-channel, wear-resistant integral cast central trough are both in a closed state. When replacing the traction chain, maintenance personnel need to go to the coal wall side or stand on the central trough to operate, which increases the safety risk of maintenance personnel. Summary of the Invention
[0005] In view of this, it is necessary to provide a central trough for a thin coal seam scraper conveyor and its manufacturing method. When replacing the traction chain, maintenance personnel do not need to go to the coal wall side or stand on the central trough to operate, which reduces the safety risks for maintenance personnel.
[0006] In a first aspect, the present invention provides a central trough for a thin coal seam scraper conveyor, comprising a central trough assembly and a pushing trough assembly. The central trough assembly includes a central plate, a bottom plate, baffle troughs, shovel troughs, a connector, a first lower chain drum, and an upper chain track. The baffle troughs and shovel troughs are respectively disposed on the central plate and on both sides. The bottom plate is located below the central plate. Both sides of the bottom plate are respectively connected to the baffle troughs and shovel troughs. One end of the connector is connected to the side of the baffle trough facing away from the central plate, and the other end is connected to the first lower chain drum. The first lower chain drum has chain changing openings on both sides and the bottom surface. The upper chain track is disposed above the first lower chain drum. The pushing trough assembly is used to be installed on the chain changing openings to form a complete lower chain track with the first lower chain drum.
[0007] Preferably, the upper chain path includes a first upper chain barrel and a second upper chain barrel, both of which are semi-cylinders. The first upper chain barrel is disposed above the first lower chain barrel, and the second upper chain barrel is installed on the first upper chain barrel to form a complete upper chain path.
[0008] Preferably, the middle plate, bottom plate, baffle groove, shovel groove, connector, first lower chain barrel and first upper chain barrel are integrally cast, and the pusher groove assembly is integrally cast, so as to reduce the production process of the middle groove assembly and improve the production speed.
[0009] Preferably, the middle groove assembly further includes a maintenance plate, and the top of the connector has a maintenance port for inspecting the lower chain track. The maintenance plate is installed on the maintenance port.
[0010] Preferably, the top surface of the middle plate is uniformly provided with at least two wear-resistant grooves, each wear-resistant groove does not contact each other, and none of the wear-resistant grooves contact the side of the baffle groove or the side of the shovel groove; one end of the middle plate is provided with an overlapping plate, and the other end is provided with an overlapping groove. The overlapping plate is used to connect with the overlapping groove of the middle trough of the adjacent thin coal seam scraper conveyor, so as to improve the overlapping accuracy between the middle troughs of the thin coal seam scraper conveyor.
[0011] Preferably, a limiting plate is provided at the top of the side of the shovel trough facing away from the middle plate to prevent the coal mining machine from overturning during travel.
[0012] Preferably, one end of the baffle trough is provided with a first positioning protrusion and the other end with a first positioning groove. The first positioning protrusion is used to connect with the first positioning groove of the middle trough of the adjacent thin coal seam scraper conveyor. One end of the shovel trough is provided with a second positioning protrusion and the other end with a second positioning groove. The second positioning protrusion is used to connect with the second positioning groove of the middle trough of the adjacent thin coal seam scraper conveyor. One end of the upper chain track is provided with a third positioning protrusion and the other end with a third positioning groove. The third positioning protrusion is used to connect with the third positioning groove of the middle trough of the adjacent thin coal seam scraper conveyor. This ensures that the two adjacent middle troughs of the thin coal seam scraper conveyor can be accurately positioned.
[0013] Preferably, the pusher groove assembly includes a panel, a first lower base plate, a second lower base plate, a second lower chain drum, and a third lower chain drum. The panel is horizontally disposed at the top of the second lower chain drum, the first lower base plate is horizontally disposed at the bottom of the second lower chain drum, the second lower base plate is connected to the end of the first lower base plate and the second lower chain drum, and the third lower chain drum is disposed at the end of the first lower base plate that is not connected to the second lower chain drum. The first lower base plate is used to be fixedly connected to the connector, the second lower base plate is used to be fixedly connected to the first lower chain drum, and the second lower chain drum and the third lower chain drum together with the first lower chain drum form a complete lower chain track.
[0014] Preferably, the first lower bottom plate has two first insert plates symmetrically arranged at the end opposite to the second lower bottom plate, and the second lower bottom plate has two second insert plates symmetrically arranged at the end facing the first lower bottom plate; the connector has two first slots symmetrically arranged, and the first lower chain barrel has two second slots symmetrically arranged on the side opposite to the connector. Each first insert plate is used to be fixedly connected to a first slot, and each second insert plate is used to be fixedly connected to a second slot, so as to fix the push groove assembly to the middle groove assembly.
[0015] In a second aspect, the present invention provides a method for manufacturing a central trough for a thin coal seam scraper conveyor as described in the first aspect, comprising the following steps:
[0016] S1, use casting simulation software to simulate the casting process and casting parameters respectively;
[0017] S2 uses 3D printing technology to create casting sand molds;
[0018] S3 involves smelting steel to obtain molten steel.
[0019] S4. Fix the casting sand mold on a platform at a 9-10° angle to the ground, pour molten steel into the casting sand mold from multiple risers, and vibrate the casting sand mold during the pouring process.
[0020] S5. Wait for the molten steel to cool naturally to obtain the casting. Then, process the surface of the casting to make it smooth and flat.
[0021] S6, wear-resistant strengthening treatment for castings;
[0022] S7 checks various properties of the casting to ensure that it meets the design requirements of the central groove.
[0023] The aforementioned thin coal seam scraper conveyor uses a central trough assembly and a pusher trough assembly. The central trough assembly includes a central plate, a bottom plate, baffle troughs, shovel troughs, a connector, a first lower chain drum, and an upper chain track. The baffle troughs and shovel troughs are respectively located on both sides of the central plate and the bottom plate, with the bottom plate located below the central plate. One end of the connector is connected to the side of the baffle trough facing away from the central plate, and the other end is connected to the first lower chain drum. The first lower chain drum has chain replacement openings on both sides and the bottom surface. The upper chain track is located above the first lower chain drum. The pusher trough assembly is installed on the chain replacement openings to form a complete lower chain track with the first lower chain drum. Thus, when replacing the traction chain, only the pusher trough assembly needs to be removed to replace the traction chain from the chain replacement opening. Maintenance personnel do not need to go to the coal wall side or stand on the central trough to perform the traction chain replacement operation, reducing the safety risks for maintenance personnel. Attached Figure Description
[0024] Figure 1 is a top-angle view of the central trough for the coal seam scraper conveyor of this application.
[0025] Figure 2 is an oblique top view of the central slot assembly of this application.
[0026] Figure 3 is an oblique top view of the central slot assembly of this application from another perspective.
[0027] Figure 4 is a top-down oblique view of the side of the central slot assembly of this application.
[0028] Figure 5 is an oblique top view of the pusher slot assembly of this application.
[0029] Figure 6 is a flowchart of the manufacturing method of this application.
[0030] In the diagram: 10 central trough for coal seam scraper conveyor, 20 central trough assembly, 21 central plate, 211 wear-resistant trough, 212 overlapping plate, 213 overlapping trough, 22 bottom plate, 23 baffle trough side, 231 first positioning protrusion, 232 first positioning groove, 24 shovel trough side, 241 limiting plate, 242 second positioning protrusion, 243 second positioning groove, 25 connecting piece, 251 inspection port, 252 first slot, 26 first lower chain drum, 261 second slot, 262 chain changing port, 27 upper chain track, 271 first upper chain drum, 272 second upper chain drum, 273 third positioning protrusion, 274 third positioning groove, 28 inspection plate, 30 pushing trough assembly, 31 panel, 32 first lower bottom plate, 33 second lower bottom plate, 34 second lower chain drum, 35 third lower chain drum, 36 first insert plate, 37 second insert plate.
[0031] Detailed implementation method
[0032] The technical solutions and effects of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.
[0033] Referring to Figures 1 and 4, in a first aspect, the present invention provides a central trough 10 for a thin coal seam scraper conveyor, including a central trough assembly 20 and a pushing trough assembly 30. The central trough assembly 20 includes a central plate 21, a bottom plate 22, baffle trough sides 23, shovel trough sides 24, a connector 25, a first lower chain drum 26, and an upper chain track 27. The baffle trough sides 23 and the shovel trough sides 24 are respectively disposed on both sides of the central plate 21, and the bottom plate 22 is located below the central plate 21. The two sides of the bottom plate 22 are respectively connected to the baffle trough sides 23 and the shovel trough sides 24. The plate groove side 24 is connected, and one end of the connector 25 is connected to the side of the baffle groove side 23 facing away from the middle plate 21, and the other end is connected to the first lower chain drum 26. The first lower chain drum 26 has chain changing ports 262 on both sides and the bottom surface. The push groove assembly 30 is used to install on the chain changing port 262 to form a complete lower chain track with the first lower chain drum 26. The upper chain track 27 is set above the first lower chain drum 26, and the push groove assembly 30 is used to install on the chain changing port 262 to form a complete lower chain track with the first lower chain drum 26.
[0034] Referring to Figure 2, further, the upper chain path 27 includes a first upper chain barrel 271 and a second upper chain barrel 272. Both the first upper chain barrel 271 and the second upper chain barrel 272 are semi-cylinders. The first upper chain barrel 271 is located above the first lower chain barrel 26, and the second upper chain barrel 272 is used to be installed on the first upper chain barrel 271 to form a complete upper chain path 27.
[0035] Furthermore, the middle plate 21, bottom plate 22, baffle groove side 23, shovel groove side 24, connector 25, first lower chain barrel 26 and first upper chain barrel 271 are integrally cast, and the pusher groove assembly 30 is integrally cast, so as to reduce the production process of the middle groove assembly 20 and increase the production speed; at the same time, by connecting the first lower chain barrel 26 and the first upper chain barrel 271 to the middle plate 21, bottom plate 22, baffle groove side 23 and shovel groove side 24 through connector 25, the deformation resistance of the casting can be improved.
[0036] In this embodiment, compared to welding and casting technology, the following advantages are available:
[0037] 1. The use of integral casting technology can increase the strength, rigidity, wear resistance and load-bearing capacity of castings;
[0038] 2. It can be cast in one piece without complicated processing later. The process is relatively simple and suitable for mass production of the same part;
[0039] 3. It saves production steps, reduces the number of welders, and mitigates the health hazards to workers.
[0040] Furthermore, the middle groove assembly 20 also includes a maintenance plate 28, and the top of the connector 25 has a maintenance port 251 for maintenance of the lower chain track. The maintenance plate 28 is installed on the maintenance port 251.
[0041] Referring to Figure 4, furthermore, the top surface of the middle plate 21 is uniformly provided with at least two wear-resistant grooves 211. The wear-resistant grooves 211 do not contact each other, and none of the wear-resistant grooves 211 contact the baffle groove side 23 or the shovel groove side 24. In this way, through cracks generated during wear-resistant treatment of the casting can be prevented; the lateral transmission of vibration can be reduced; since the chain track of the middle plate 21 is easy to wear, more wear allowance can be reserved; one end of the middle plate 21 is provided with an overlapping plate 212, and the other end is provided with an overlapping groove 213. The overlapping plate 212 is used to connect with the overlapping groove 213 of the middle trough 10 of the adjacent thin coal seam scraper conveyor, so as to improve the overlapping accuracy between the middle troughs 10 of the thin coal seam scraper conveyor and avoid the scraping and jamming phenomenon of the scraper when running on the middle plate 21.
[0042] In this embodiment, each wear-resistant groove 211 adopts a sinusoidal curve structure. This is because the central groove 10 of the thin coal seam scraper conveyor is a dual-channel system, including a scraper chain channel and a coal mining machine traction chain channel. During the operation of the equipment, these two chains of different specifications will generate excitation self-vibration, which will eventually converge at the central groove 10 of the thin coal seam scraper conveyor, resulting in double-chain resonance or resonance with the central groove 10 of the thin coal seam scraper conveyor. The sinusoidal curve structure of the wear-resistant groove 211 can offset the vibration transmission generated by the scraper conveyor chain during operation in the scraper chain channel, preventing resonance. At the same time, coal powder will fill the wear-resistant groove 211, which will play a lubricating role during the transportation of coal.
[0043] Referring to Figure 2, furthermore, a limiting plate 241 is provided at the top of the side of the shovel trough 24 facing away from the middle plate 21 to prevent the coal mining machine from overturning during its movement.
[0044] Referring to Figures 2 and 3, further, one end of the baffle trough 23 is provided with a first positioning protrusion 231, and the other end is provided with a first positioning groove 232. The first positioning protrusion 231 is used to connect with the first positioning groove 232 of the adjacent thin coal seam scraper conveyor center trough 10; one end of the shovel trough 24 is provided with a second positioning protrusion 242, and the other end is provided with a second positioning groove 243. The second positioning protrusion 242 is used to connect with the second positioning groove 243 of the adjacent thin coal seam scraper conveyor center trough 10; one end of the upper chain conveyor 27 is provided with a third positioning protrusion 273, and the other end is provided with a third positioning groove 274. The third positioning protrusion 273 is used to connect with the third positioning groove 274 of the adjacent thin coal seam scraper conveyor center trough 10; so that the two adjacent thin coal seam scraper conveyor center troughs 10 can be accurately positioned; thus, compared with the common two-point hinge positioning method in the prior art, changing to three-point hinge can increase the positioning accuracy between the thin coal seam scraper conveyor center troughs 10.
[0045] Referring to Figure 5, the pusher groove assembly 30 further includes a panel 31, a first lower base plate 32, a second lower base plate 33, a second lower chain drum 34, and a third lower chain drum 35. The panel 31 is horizontally disposed at the top of the second lower chain drum 34, the first lower base plate 32 is horizontally disposed at the bottom of the second lower chain drum 34, the second lower base plate 33 is connected to the end of the first lower base plate 32 and the second lower chain drum 34, and the third lower chain drum 35 is disposed at the end of the first lower base plate 32 that is not connected to the second lower chain drum 34. The first lower base plate 32 is used to be fixedly connected to the connector 25, the second lower base plate 33 is used to be fixedly connected to the first lower chain drum 26, and the second lower chain drum 34 and the third lower chain drum 35 are used to form a complete lower chain track with the first lower chain drum 26.
[0046] Referring to Figures 2 to 5, further, the first lower base plate 32 has two symmetrically arranged first insert plates 36 at the end facing away from the second lower base plate 33, and the second lower base plate 33 has two symmetrically arranged second insert plates 37 at the end facing the first lower base plate 32; the connector 25 has two symmetrically arranged first slots 252, and the first lower chain barrel 26 has two symmetrically arranged second slots 261 on the side facing away from the connector 25. Each first insert plate 36 is used to be fixedly connected to a first slot 252, and each second insert plate 37 is used to be fixedly connected to a second slot 261, so as to fix the push groove assembly 30 onto the middle groove assembly 20.
[0047] In this embodiment, each first insert plate 36 has a first connecting hole, each second insert plate 37 has a second connecting hole, each first slot 252 has a first fixing hole, and each second slot 261 has a second fixing hole. Each first connecting hole and its corresponding first fixing hole are fixedly connected by bolts, and each second connecting hole and its corresponding second fixing hole are fixedly connected by bolts. In this way, the stress on the central trough 10 of the thin coal seam scraper conveyor can be evenly distributed to the four connecting points, reducing the deformation of the central trough 10 of the thin coal seam scraper conveyor.
[0048] Referring to Figure 6, in a second aspect, the present invention provides a method for manufacturing a central trough 10 for a thin coal seam scraper conveyor as described in the first aspect, comprising the following steps:
[0049] S1. The casting process and casting parameters are simulated using casting simulation software; specifically, the casting parameters include temperature and gating gate, etc.
[0050] S2 uses 3D printing technology to create casting sand molds;
[0051] S3 involves smelting steel to obtain molten steel. Specifically, during the smelting process, it is necessary to strictly control the chemical composition and tapping temperature of the molten steel to ensure its quality. Before tapping, the molten steel needs to be purified by argon blowing inside the furnace.
[0052] S4. Fix the casting sand mold on a platform at a 9-10° angle to the ground, pour molten steel into the casting sand mold from multiple risers, and vibrate the casting sand mold during the pouring process.
[0053] S5. Wait for the molten steel to cool naturally to obtain the casting. Then, process the surface of the casting to make it smooth and flat. Specifically, the surface treatment of the casting includes cleaning waste sand, gas cutting risers, cleaning burrs, cleaning flash, and grinding the casting.
[0054] S6. The casting is subjected to wear-resistant strengthening treatment. Specifically, the casting is first pre-treated by normalizing at 900℃, held for 4 hours and then air-cooled; then the casting is quenched at 900℃, held for 4 hours and then water-cooled; finally, the casting is tempered at 350℃, held for 5 hours and then air-cooled.
[0055] S7, inspect various properties of the casting to ensure that the casting meets the design requirements of the central groove; specifically, the various properties of the casting are inspected, including the mechanical properties, metallographic structure and ultrasonic flaw detection of the casting's interior.
[0056] In this embodiment, 3D printing technology is used to cast sand molds so that the mold parameters can be adjusted according to different application scenarios.
[0057] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. [Amended pursuant to Rule 26 31.12.2025] A middle trough for a thin seam scraper conveyor, characterized in that, The system includes a central groove assembly and a pushing groove assembly. The central groove assembly includes a central plate, a bottom plate, baffle grooves, shovel grooves, a connector, a first lower chain drum, and an upper chain track. The baffle grooves and shovel grooves are respectively disposed on the central plate and on both sides. The bottom plate is located below the central plate, and both sides of the bottom plate are connected to the baffle grooves and shovel grooves, respectively. One end of the connector is connected to the side of the baffle groove facing away from the central plate, and the other end is connected to the first lower chain drum. The first lower chain drum has chain changing openings on both sides and the bottom surface. The upper chain track is disposed above the first lower chain drum. The pushing groove assembly is used to be installed on the chain changing openings to form a complete lower chain track with the first lower chain drum.
2. The pan for a thin-seam scraper conveyor as claimed in claim 1, characterized in that The upper chain path includes a first upper chain barrel and a second upper chain barrel, both of which are semi-cylinders. The first upper chain barrel is positioned above the first lower chain barrel, and the second upper chain barrel is installed on the first upper chain barrel to form a complete upper chain path.
3. The pan for a thin-seam scraper conveyor as claimed in claim 2, characterized in that The middle plate, bottom plate, baffle groove, shovel groove, connector, first lower chain barrel and first upper chain barrel are integrally cast, and the pusher groove assembly is integrally cast to reduce the production process of the middle groove assembly and improve the production speed.
4. The pan for a thin-seam scraper conveyor as claimed in claim 1, characterized in that The central groove assembly also includes a maintenance plate. The top of the connector has a maintenance port for inspecting the lower chain track. The maintenance plate is installed on the maintenance port.
5. [Amended pursuant to Rule 26 31.12.2025] The pan for a thin-seam scraper conveyor as claimed in claim 1, characterized in that The top surface of the middle plate is uniformly provided with at least two wear-resistant grooves, which do not contact each other and do not contact the side of the baffle or the side of the shovel. One end of the middle plate is provided with an overlapping plate and the other end is provided with an overlapping groove. The overlapping plate is used to connect with the overlapping groove of the middle trough of the adjacent thin coal seam scraper conveyor to improve the overlapping accuracy between the middle troughs of the thin coal seam scraper conveyor.
6. [Amended according to Rule 26 31.12.2025] The pan for a thin-seam scraper conveyor as claimed in claim 1, characterized in that, The top of the shovel trough facing away from the middle plate is provided with a limiting plate to prevent the coal mining machine from overturning during its movement.
7. The pan for a thin-seam scraper conveyor as claimed in claim 1, characterized in that One end of the baffle trough is provided with a first positioning protrusion, and the other end is provided with a first positioning groove. The first positioning protrusion is used to connect with the first positioning groove of the middle trough of the adjacent thin coal seam scraper conveyor. One end of the shovel trough is provided with a second positioning protrusion, and the other end is provided with a second positioning groove. The second positioning protrusion is used to connect with the second positioning groove of the middle trough of the adjacent thin coal seam scraper conveyor. One end of the upper chain track is provided with a third positioning protrusion, and the other end is provided with a third positioning groove. The third positioning protrusion is used to connect with the third positioning groove of the middle trough of the adjacent thin coal seam scraper conveyor. This allows the two adjacent middle troughs of the thin coal seam scraper conveyor to be accurately positioned.
8. The pan for a thin-seam scraper conveyor as claimed in claim 1, characterized in that The push-slot assembly includes a panel, a first lower base plate, a second lower base plate, a second lower chain drum, and a third lower chain drum. The panel is horizontally positioned at the top of the second lower chain drum, and the first lower base plate is horizontally positioned at the bottom of the second lower chain drum. The second lower base plate is connected to the end of the first lower base plate that is connected to the second lower chain drum. The third lower chain drum is positioned at the end of the first lower base plate that is not connected to the second lower chain drum. The first lower base plate is used for fixed connection with the connector, and the second lower base plate is used for fixed connection with the first lower chain drum. The second lower chain drum and the third lower chain drum, together with the first lower chain drum, form a complete lower chain track.
9. [Amended according to Rule 26 31.12.2025] The pan for a thin-seam scraper conveyor as claimed in claim 8, characterized in that, Two first insert plates are symmetrically arranged on the end of the first lower bottom plate facing away from the second lower bottom plate, and two second insert plates are symmetrically arranged on the end of the second lower bottom plate facing the first lower bottom plate. Two first slots are symmetrically arranged on the connector, and two second slots are symmetrically arranged on the side of the first lower chain barrel facing away from the connector. Each first insert plate is used to be fixedly connected to a first slot, and each second insert plate is used to be fixedly connected to a second slot, so as to fix the push groove assembly to the middle groove assembly.
10. [Amended pursuant to Rule 26 31.12.2025] A method of manufacturing a center trough for a thin-seam scraper conveyor as claimed in any one of claims 1 to 9, characterized in that, Includes the following steps: SS1 uses casting simulation software to simulate the casting process and casting parameters respectively; S2 uses 3D printing technology to create casting sand molds; S3 involves smelting steel to obtain molten steel. S4. Fix the casting sand mold on a platform at a 9-10° angle to the ground, pour molten steel into the casting sand mold from multiple risers, and vibrate the casting sand mold during the pouring process. S5. Wait for the molten steel to cool naturally to obtain the casting. Then, process the surface of the casting to make it smooth and flat. S6, wear-resistant strengthening treatment for castings; S7 checks various properties of the casting to ensure that it meets the design requirements of the central groove.