Middle trough for thin coal seam scraper conveyor and manufacturing method of middle trough

Abstract

The invention relates to the technical field of coal mine mechanical equipment, in particular to a middle trough for a thin coal seam scraper conveyor and a manufacturing method thereof.The middle trough for the thin coal seam scraper conveyor is internally provided with a middle trough assembly and a pushing trough assembly, and the middle trough assembly comprises a middle plate, a bottom plate, a baffle plate ledge, a shovel plate ledge, a connecting piece, a first lower chain barrel and an upper chain way; the baffle ledge and the shovel plate ledge are arranged on the two sides of the middle plate and the two sides of the bottom plate respectively, the bottom plate is located below the middle plate, one end of the connecting piece is connected with the side, back on to the middle plate, of the baffle ledge, the other end of the connecting piece is connected with the first lower chain barrel, chain replacing openings are formed in the two sides and the bottom face of the first lower chain barrel, and the upper chain way is arranged above the first lower chain barrel. The pushing groove assembly is used for being installed on a chain changing opening. Thus, when the traction chain is replaced, the traction chain can be replaced from the chain replacing opening only by disassembling the pushing groove assembly, a maintainer can replace the traction chain without going to the coal wall side or standing on the middle groove, and the safety risk of the maintainer is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine mechanical equipment, and in particular to a middle trough for a thin coal seam scraper conveyor and a manufacturing method thereof. Background Art

[0002] Scraper conveyor is the main transportation equipment in the underground mining working face of coal mine. The middle trough is the core part and main component of the scraper conveyor. The rationality of its structure will affect the service life of the scraper conveyor. When the scraper conveyor works in a thin coal seam, due to the limited working space of the thin coal seam, it is necessary to lower the height of the middle trough, which reduces the welding space of the middle trough, increases the difficulty of welding operation, reduces the quality of welding, and affects the carrying capacity and service life of the middle trough. At the same time, due to the different welding properties between different materials, the internal stress of welding cannot be eliminated, which makes the middle plate and the bottom plate of the middle trough easy to fall off or break, affecting the normal use of the scraper conveyor and even causing production suspension.

[0003] In order to solve the above technical problems, the technical solution of the Chinese utility model patent announcement with patent application number CN201320485173.8 is a multi-channel wear-resistant integrally cast middle trough. It solves the problem of integration of the transport chain channel, the chain traction coal mining system transport chain, and the mobile cable channel of the coal mining machine towing cable system during work, including the middle trough body, the upper parts of the two sides of the middle trough body are provided with chain traction coal mining machine sliding shoe tracks, the upper and lower parts of the middle of the middle trough body are respectively the upper channel of the transport chain and the lower channel of the transport chain, the left side of the middle trough body is the upper and lower layers of the mobile cable channel of the towing cable system, and the outer side of the mobile cable channel of the towing cable system is provided with a bracket push connection device; the right side of the middle trough body is provided with the lower channel of the traction chain and the upper channel of the traction chain, and the bottom right side of the middle trough body is provided with a middle trough coal shoveling plate. The integral casting method of the present invention reduces the welding space of the welding equipment, makes the structure of the equipment more compact, reduces the overall height of the whole machine, and the equipment can be widely used in the working face of medium and thick coal seams and even thin coal seams.

[0004] However, the above-mentioned prior art has the following technical problems: the lower channel of the traction chain and the upper channel of the traction chain of the above-mentioned multi-channel wear-resistant integrally cast middle groove are both in a closed state. When replacing the traction chain, the maintenance personnel need to go to the coal wall side or stand on the middle groove to operate, which increases the safety risk of the maintenance personnel. Summary of the invention

[0005] In view of this, it is necessary to provide a middle trough for a thin coal seam scraper conveyor and a manufacturing method thereof. When replacing the traction chain, maintenance personnel do not need to go to the coal wall side or stand on the middle trough to operate, reducing the safety risks of maintenance personnel.

[0006] In the first aspect, the present invention provides a middle trough for a thin coal seam scraper conveyor, comprising a middle trough assembly and a push trough assembly, wherein the middle trough assembly comprises a middle plate, a bottom plate, a baffle trough side, a shovel plate trough side, a connecting piece, a first lower chain barrel and an upper chain path, wherein the baffle trough side and the shovel plate trough side are respectively arranged on the middle plate and both sides, the bottom plate is located below the middle plate, and both sides of the bottom plate are respectively connected to the baffle trough side and the shovel plate trough side, one end of the connecting piece is connected to the side of the baffle trough side facing away from the middle plate, and the other end is connected to the first lower chain barrel, both sides and the bottom surface of the first lower chain barrel are provided with chain changing openings, the upper chain path is arranged above the first lower chain barrel, and the push trough assembly is used to be installed on the chain changing opening to form a complete lower chain path with the first lower chain barrel.

[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 arranged above the first lower chain barrel, and the second upper chain barrel is used to be installed on the first upper chain barrel to form a complete upper chain path.

[0008] Preferably, the middle plate, bottom plate, baffle plate groove side, shovel plate groove side, connecting piece, first lower chain barrel and first upper chain barrel are integrally cast, and the push groove assembly is integrally cast to reduce the production process of the middle groove assembly and improve the production speed.

[0009] Preferably, the middle trough assembly further comprises an inspection plate, the top end of the connecting member is provided with an inspection opening for inspecting the lower chain track, and the inspection plate is used to be installed on the inspection opening.

[0010] Preferably, at least two wear-resistant grooves are evenly provided on the top surface of the middle plate, the wear-resistant grooves do not contact each other, and the wear-resistant grooves do not contact the baffle groove side or the shovel plate groove side; a lap plate is provided at one end of the middle plate, and a lap groove is provided at the other end, and the lap plate is used to connect with the lap groove of the middle groove of the adjacent thin coal seam scraper conveyor to improve the lap accuracy between the middle grooves of the thin coal seam scraper conveyor.

[0011] Preferably, a limit plate is provided at the top of the shovel plate groove side facing away from the middle plate to prevent the coal mining machine from flipping over during movement.

[0012] Preferably, a first positioning protrusion is provided at one end of the baffle groove side, and a first positioning groove is provided at the other end, and the first positioning protrusion is used to connect with the first positioning groove of the middle groove of the adjacent thin coal seam scraper conveyor; a second positioning protrusion is provided at one end of the shovel plate groove side, and a second positioning groove is provided at the other end, and the second positioning protrusion is used to connect with the second positioning groove of the middle groove of the adjacent thin coal seam scraper conveyor; a third positioning protrusion is provided at one end of the upper chain path, and a third positioning groove is provided at the other end, and the third positioning protrusion is used to connect with the third positioning groove of the middle groove of the adjacent thin coal seam scraper conveyor; so that the middle grooves of two adjacent thin coal seam scraper conveyors can be accurately positioned.

[0013] Preferably, the push groove assembly includes a panel, a first lower bottom plate, a second lower bottom plate, a second lower chain barrel and a third lower chain barrel, the panel is horizontally arranged at the top end of the second lower chain barrel, the first lower bottom plate is horizontally arranged at the bottom end of the second lower chain barrel, the second lower bottom plate is connected to one end where the first lower bottom plate and the second lower chain barrel are connected, the third lower chain barrel is arranged at an end of the first lower bottom plate that is not connected to the second lower chain barrel, the first lower bottom plate is used to be fixedly connected to the connecting piece, the second lower bottom plate is used to be fixedly connected to the first lower chain barrel, and the second lower chain barrel and the third lower chain barrel are used to form a complete lower chain path with the first lower chain barrel.

[0014] Preferably, two first plug plates are symmetrically provided on one end of the first lower base plate facing away from the second lower base plate, and two second plug plates are symmetrically provided on one end of the second lower base plate facing the first lower base plate; two first slots are symmetrically provided on the connecting piece, and two second slots are symmetrically provided on the side of the first lower chain barrel facing away from the connecting piece, each first plug plate is used to be fixedly connected to a first slot, and each second plug plate is used to be fixedly connected to a second slot, so as to fix the push slot assembly to the middle slot assembly.

[0015] In a second aspect, the present invention provides a method for manufacturing a middle trough for a thin coal seam scraper conveyor as described in the first aspect, comprising the following steps: S1, using casting simulation software to simulate the casting process and casting parameters respectively; S2, using 3D printing technology to make casting sand molds; S3, smelting the steel to obtain molten steel; S4, fixing the casting sand mold on a platform at an angle of 9-10° on the ground, injecting molten steel into the casting sand mold from multiple risers, and vibrating the casting sand mold during the pouring process; S5, waiting for the molten steel to cool naturally to obtain a casting, and treating the surface of the casting to make it smooth and flat; S6, wear-resistant strengthening treatment of castings; S7, test the various properties of the casting to ensure that the casting meets the design requirements of the middle groove.

[0016] The above-mentioned middle trough for thin coal seam scraper conveyor is provided with a middle trough assembly and a push trough assembly, the middle trough assembly includes a middle plate, a bottom plate, a baffle trough side, a shovel plate trough side, a connecting piece, a first lower chain barrel and an upper chain path, the baffle trough side and the shovel plate trough side are respectively arranged on both sides of the middle plate and the bottom plate, and the bottom plate is located below the middle plate, one end of the connecting piece is connected to the side of the baffle trough side facing away from the middle plate, and the other end is connected to the first lower chain barrel, both sides and the bottom surface of the first lower chain barrel are provided with chain changing openings, the upper chain path is arranged above the first lower chain barrel, and the push trough assembly is used to be installed on the chain changing opening to form a complete lower chain path with the first lower chain barrel; in this way, when replacing the traction chain, it is only necessary to remove the push trough assembly, and the traction chain can be replaced from the chain changing opening, and the maintenance personnel do not need to go to the coal wall side or stand on the middle trough to replace the traction chain, thereby reducing the safety risks of the maintenance personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an oblique bird's-eye view of the middle trough for the coal seam scraper conveyor of the present application.

[0018] Figure 2 It is an oblique top view of the middle tank assembly of the present application.

[0019] Figure 3 This is an oblique bird's-eye view of the middle tank assembly of the present application from another perspective.

[0020] Figure 4 It is an oblique top-down view of the side of the middle tank assembly of the present application.

[0021] Figure 5 It is an oblique top-down view of the push slot assembly of the present application.

[0022] Figure 6 It is a flow chart of the manufacturing method of the present application.

[0023] In the figure: a middle trough 10 for a coal seam scraper conveyor, a middle trough assembly 20, a middle plate 21, a wear-resistant groove 211, a lap plate 212, a lap groove 213, a bottom plate 22, a baffle groove side 23, a first positioning protrusion 231, a first positioning groove 232, a shovel plate groove side 24, a limit plate 241, a second positioning protrusion 242, a second positioning groove 243, a connecting piece 25, an inspection port 251, a first slot 252, a first lower chain barrel 26, a second slot 261, a chain changing port 262, an upper chain path 27, a first upper chain barrel 271, a second upper chain barrel 272, a third positioning protrusion 273, a third positioning groove 274, an inspection plate 28, a push groove assembly 30, a panel 31, a first lower bottom plate 32, a second lower bottom plate 33, a second lower chain barrel 34, a third lower chain barrel 35, a first plug plate 36, and a second plug plate 37. DETAILED DESCRIPTION

[0024] The technical solutions and technical effects of the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings of the present invention.

[0025] Please refer to Figure 1 and Figure 4 In the first aspect, the present invention provides a middle trough 10 for a thin coal seam scraper conveyor, comprising a middle trough assembly 20 and a push trough assembly 30, wherein the middle trough assembly 20 comprises a middle plate 21, a bottom plate 22, a baffle trough side 23, a shovel plate trough side 24, a connecting piece 25, a first lower chain barrel 26, and an upper chain track 27, wherein the baffle trough side 23 and the shovel plate trough side 24 are respectively arranged on both sides of the middle plate 21, the bottom plate 22 is located below the middle plate 21, and the two sides of the bottom plate 22 are respectively connected to the baffle trough side 23 and the shovel plate trough side 24. 4, one end of the connecting member 25 is connected to the side of the baffle groove 23 facing away from the middle plate 21, and the other end is connected to the first lower chain barrel 26. Both sides and the bottom surface of the first lower chain barrel 26 are provided with chain changing openings 262, and the push groove assembly 30 is used to be installed on the chain changing openings 262 to form a complete lower chain path with the first lower chain barrel 26; the upper chain path 27 is arranged above the first lower chain barrel 26, and the push groove assembly 30 is used to be installed on the chain changing openings 262 to form a complete lower chain path with the first lower chain barrel 26.

[0026] Please refer to Figure 2 Furthermore, the upper chain path 27 includes a first upper chain barrel 271 and a second upper chain barrel 272. The first upper chain barrel 271 and the second upper chain barrel 272 are both semi-cylinders. The first upper chain barrel 271 is arranged 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.

[0027] Furthermore, the middle plate 21, the bottom plate 22, the baffle plate groove side 23, the shovel plate groove side 24, the connecting piece 25, the first lower chain barrel 26 and the first upper chain barrel 271 are cast as a whole, and the push groove assembly 30 is cast as a whole to reduce the production process of the middle groove assembly 20 and improve the production speed; at the same time, by connecting the first lower chain barrel 26 and the first upper chain barrel 271 with the middle plate 21, the bottom plate 22, the baffle plate groove side 23 and the shovel plate groove side 24 through the connecting piece 25, the deformation resistance of the casting can be improved.

[0028] In this embodiment, compared with the welding and casting technology, it has the following beneficial effects: 1. The use of integral casting technology can increase the strength, rigidity, wear resistance and load-bearing performance of castings; 2. One-time casting, no complicated processing is required in the later stage, the process is relatively simple, and it is suitable for mass production of the same parts; 3. Save production processes, reduce the input of welders, and reduce harm to personnel health.

[0029] Furthermore, the middle tank assembly 20 also includes an inspection plate 28 . An inspection opening 251 is formed at the top of the connecting member 25 for inspecting the lower chain track. The inspection plate 28 is installed on the inspection opening 251 .

[0030] Please refer to Figure 4 Furthermore, at least two wear-resistant grooves 211 are evenly arranged on the top surface of the middle plate 21, and the wear-resistant grooves 211 do not contact each other, and the wear-resistant grooves 211 do not contact the baffle groove side 23 or the shovel plate groove side 24; in this way, through cracks generated when the casting is subjected to wear-resistant treatment can be prevented; the lateral transmission of vibration can be reduced; since the chain path of the middle plate 21 is easy to wear, more wear can be reserved; a lap plate 212 is provided at one end of the middle plate 21, and a lap groove 213 is provided at the other end. The lap plate 212 is used to connect with the lap groove 213 of the middle groove 10 of the adjacent thin coal seam scraper conveyor to improve the lap accuracy between the middle grooves 10 for the thin coal seam scraper conveyor, and avoid the scraping phenomenon when the scraper runs on the middle plate 21.

[0031] In the present embodiment, each wear-resistant groove 211 adopts a sinusoidal structure. This is because the middle groove 10 for the thin coal seam scraper conveyor is a double-channel, 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 produce excited self-vibration, and finally intersect at the middle groove 10 for the thin coal seam scraper conveyor, which will produce double chain resonance or resonance with the middle groove 10 for the thin coal seam scraper conveyor. The wear-resistant groove 211 with a sinusoidal structure can offset the vibration transmission generated by the scraper conveyor chain when it is running in the scraper chain channel, thereby preventing the generation of resonance; at the same time, coal powder will be filled in the wear-resistant groove 211, which plays a lubricating role in the process of transporting coal.

[0032] Please refer to Figure 2 Furthermore, a limit plate 241 is provided at the top of the shovel plate groove side 24 facing away from the middle plate 21 to prevent the coal mining machine from turning over during the movement.

[0033] Please refer to Figures 2 to 3Furthermore, a first positioning protrusion 231 is provided at one end of the baffle groove side 23, and a first positioning groove 232 is provided at the other end, and the first positioning protrusion 231 is used to connect with the first positioning groove 232 of the middle groove 10 of the adjacent thin coal seam scraper conveyor; a second positioning protrusion 242 is provided at one end of the shovel plate groove side 24, and a second positioning groove 243 is provided at the other end, and the second positioning protrusion 242 is used to connect with the second positioning groove 243 of the middle groove 10 of the adjacent thin coal seam scraper conveyor; a third positioning protrusion 273 is provided at one end of the upper chain path 27, and a third positioning groove 274 is provided at the other end, and the third positioning protrusion 273 is used to connect with the third positioning groove 274 of the middle groove 10 of the adjacent thin coal seam scraper conveyor; so that the middle grooves 10 of two adjacent thin coal seam scraper conveyors can be accurately positioned; in this way, compared with the common two-hinged positioning method in the prior art, the positioning accuracy between the middle grooves 10 of each thin coal seam scraper conveyor can be increased after being converted to three-hinged.

[0034] Please refer to Figure 5 Further, the push slot assembly 30 includes a panel 31, a first lower bottom plate 32, a second lower bottom plate 33, a second lower chain barrel 34 and a third lower chain barrel 35. The panel 31 is horizontally arranged at the top of the second lower chain barrel 34, the first lower bottom plate 32 is horizontally arranged at the bottom of the second lower chain barrel 34, the second lower bottom plate 33 is connected to one end of the first lower bottom plate 32 and the second lower chain barrel 34, the third lower chain barrel 35 is arranged at one end of the first lower bottom plate 32 that is not connected to the second lower chain barrel 34, the first lower bottom plate 32 is used to be fixedly connected to the connecting member 25, the second lower bottom plate 33 is used to be fixedly connected to the first lower chain barrel 26, and the second lower chain barrel 34 and the third lower chain barrel 35 are used to form a complete lower chain path with the first lower chain barrel 26.

[0035] Please refer to Figures 2 to 5 Furthermore, two first plug plates 36 are symmetrically provided at one end of the first lower base plate 32 facing away from the second lower base plate 33, and two second plug plates 37 are symmetrically provided at one end of the second lower base plate 33 facing the first lower base plate 32; two first slots 252 are symmetrically provided on the connecting member 25, and two second slots 261 are symmetrically provided on the side of the first lower chain barrel 26 facing away from the connecting member 25, each first plug plate 36 is used to be fixedly connected to a first slot 252, and each second plug plate 37 is used to be fixedly connected to a second slot 261, so as to fix the push slot assembly 30 to the middle slot assembly 20.

[0036] In this embodiment, each first plug plate 36 is provided with a first connecting hole, each second plug plate 37 is provided with a second connecting hole, each first slot 252 is provided with a first fixing hole, each second slot 261 is provided with a second fixing hole, each first connecting hole is fixedly connected to the corresponding first fixing hole by bolts, and each second connecting hole is fixedly connected to the corresponding second fixing hole by bolts; in this way, the force of the middle trough 10 for thin coal seam scraper conveyor can be evenly distributed to the four connection points, thereby reducing the deformation of the middle trough 10 for thin coal seam scraper conveyor.

[0037] Please refer to Figure 6 In a second aspect, the present invention provides a method for manufacturing the middle trough 10 for a thin coal seam scraper conveyor according to the first aspect, comprising the following steps: S1, using casting simulation software to simulate the casting process and casting parameters respectively; specifically, the casting parameters include temperature and pouring port, etc.; S2, using 3D printing technology to make casting sand molds; S3, smelting the steel to obtain molten steel; specifically, during the smelting process, the chemical composition of the molten steel and the furnace temperature need to be strictly controlled to ensure the quality of the molten steel. The molten steel needs to be purified by blowing argon in the furnace before it is discharged from the furnace.

[0038] S4, fixing the casting sand mold on a platform at an angle of 9-10° on the ground, injecting molten steel into the casting sand mold from multiple risers, and vibrating the casting sand mold during the pouring process; S5, waiting for the molten steel to cool naturally to obtain a casting, and treating the surface of the casting to make it smooth and flat; specifically, the treatment of the casting surface includes cleaning waste sand, gas cutting risers, cleaning burrs, cleaning flash and grinding the casting.

[0039] S6, perform wear-resistant strengthening treatment on the casting; specifically, first perform normalizing pretreatment on the casting at a temperature of 900°C, keep it warm for 4 hours and then air-cool it; then perform quenching treatment on the casting at a temperature of 900°C, keep it warm for 4 hours and then water-cool it; finally, perform tempering treatment on the casting at a temperature of 350°C, keep it warm for 5 hours and then air-cool it.

[0040] S7, inspect various properties of the casting to ensure that the casting meets the design requirements of the middle groove; specifically, inspecting various properties of the casting includes inspecting the mechanical properties, metallographic structure and ultrasonic flaw detection of the casting.

[0041] In this embodiment, 3D printing technology is used to cast sand molds so that the parameters of the mold can be adjusted according to different application scenarios.

[0042] The above are only 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 in the protection scope of the present invention.

Claims

1. A middle trough for a thin coal seam scraper conveyor, characterized in that: It includes a middle slot assembly and a push slot assembly, the middle slot assembly includes a middle plate, a bottom plate, a baffle slot side, a shovel plate slot side, a connecting piece, a first lower chain barrel and an upper chain track, the baffle slot side and the shovel plate slot side are respectively arranged on the middle plate and both sides, the bottom plate is located below the middle plate, the two sides of the bottom plate are respectively connected to the baffle slot side and the shovel plate slot side, one end of the connecting piece is connected to the side of the baffle slot side facing away from the middle plate, and the other end is connected to the first lower chain barrel, both sides and the bottom surface of the first lower chain barrel are provided with chain changing ports, the upper chain track is arranged above the first lower chain barrel, and the push slot assembly is used to be installed on the chain changing port to form a complete lower chain track with the first lower chain barrel.

2. The middle trough for a thin coal seam scraper conveyor according to 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 arranged above the first lower chain barrel, and the second upper chain barrel is used to be installed on the first upper chain barrel to form a complete upper chain path.

3. The middle trough for a thin coal seam scraper conveyor according to claim 2, characterized in that: The middle plate, bottom plate, baffle plate groove side, shovel plate groove side, connecting piece, first lower chain barrel and first upper chain barrel are integrally cast, and the push groove assembly is integrally cast to reduce the production process of the middle groove assembly and improve the production speed.

4. The middle trough for a thin coal seam scraper conveyor according to claim 1, characterized in that: The middle tank assembly also includes an inspection plate. The top end of the connecting piece is provided with an inspection opening for inspecting the lower chain track. The inspection plate is used to be installed on the inspection opening.

5. The middle trough for a thin coal seam scraper conveyor as claimed in claim 1, characterized in that At least two wear-resistant grooves are evenly arranged on the top surface of the middle plate, and the wear-resistant grooves do not contact each other, and none of the wear-resistant grooves contacts the baffle plate groove side or the shovel plate groove side; a lap plate is arranged at one end of the middle plate, and a lap groove is arranged at the other end, and the lap plate is used to connect with the lap groove of the middle groove of the adjacent thin coal seam scraper conveyor to improve the lap accuracy between the middle grooves of the thin coal seam scraper conveyor.

6. The middle trough for a thin coal seam scraper conveyor according to claim 1, characterized in that: A limit plate is provided at the top of the shovel plate groove side facing away from the middle plate to prevent the coal mining machine from turning over during the moving process.

7. The middle trough for a thin coal seam scraper conveyor according to claim 1, characterized in that: A first positioning protrusion is provided at one end of the baffle groove side, and a first positioning groove is provided at the other end, and the first positioning protrusion is used to connect with the first positioning groove of the middle groove of the adjacent thin coal seam scraper conveyor; a second positioning protrusion is provided at one end of the shovel plate groove side, and a second positioning groove is provided at the other end, and the second positioning protrusion is used to connect with the second positioning groove of the middle groove of the adjacent thin coal seam scraper conveyor; a third positioning protrusion is provided at one end of the upper chain path, and a third positioning groove is provided at the other end, and the third positioning protrusion is used to connect with the third positioning groove of the middle groove of the adjacent thin coal seam scraper conveyor; so that the middle grooves of two adjacent thin coal seam scraper conveyors can be accurately positioned.

8. The middle trough for a thin coal seam scraper conveyor according to claim 1, characterized in that: The push groove assembly includes a panel, a first lower bottom plate, a second lower bottom plate, a second lower chain barrel and a third lower chain barrel, the panel is horizontally arranged at the top end of the second lower chain barrel, the first lower bottom plate is horizontally arranged at the bottom end of the second lower chain barrel, the second lower bottom plate is connected to one end where the first lower bottom plate and the second lower chain barrel are connected, the third lower chain barrel is arranged at an end of the first lower bottom plate that is not connected to the second lower chain barrel, the first lower bottom plate is used to be fixedly connected to the connecting piece, the second lower bottom plate is used to be fixedly connected to the first lower chain barrel, and the second lower chain barrel and the third lower chain barrel are used to form a complete lower chain path with the first lower chain barrel.

9. The middle trough for a thin coal seam scraper conveyor according to claim 8, characterized in that: Two first plug plates are symmetrically provided on one end of the first lower base plate facing away from the second lower base plate, and two second plug plates are symmetrically provided on one end of the second lower base plate facing the first lower base plate; two first slots are symmetrically provided on the connecting piece, and two second slots are symmetrically provided on the side of the first lower chain barrel facing away from the connecting piece, each first plug plate is used to be fixedly connected to a first slot, and each second plug plate is used to be fixedly connected to a second slot, so as to fix the push slot assembly to the middle slot assembly.

10. A method for manufacturing a middle trough for a thin coal seam scraper conveyor according to any one of claims 1 to 9, characterized in that: The steps include: SS1, using casting simulation software to simulate the casting process and casting parameters respectively; S2, using 3D printing technology to make casting sand molds; S3, smelting the steel to obtain molten steel; S4, fixing the casting sand mold on a platform at an angle of 9-10° on the ground, injecting molten steel into the casting sand mold from multiple risers, and vibrating the casting sand mold during the pouring process; S5, waiting for the molten steel to cool naturally to obtain a casting, and treating the surface of the casting to make it smooth and flat; S6, wear-resistant strengthening treatment of castings; S7, test the various properties of the casting to ensure that the casting meets the design requirements of the middle groove.

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