Curve coal drop pipe

Abstract

The invention relates to the technical field of solid material conveying equipment, in particular to a curve coal drop pipe which comprises a head shield, a head funnel, a three-way reversing valve and two curve coal drop pipe bodies. The head shield is arranged above the head funnel; coal inlets are formed in the side walls of the head shield and the head funnel and are used for communicating with a coal conveying belt; the three-way reversing valve comprises a feeding cavity, a first discharging cavity, a second discharging cavity and a rotating baffle. A flow guide device is arranged in the head funnel and is used for ensuring that the material is in the middle position when falling down; the flow guiding device comprises a flow guiding baffle and an adjusting assembly. After coal enters the head hopper from the coal conveying belt, the flow guide baffle changes the flowing direction of raw coal, so that the raw coal is located in the center when falling, the situation that equipment is damaged due to the fact that the coal flow impacts the head hopper and the inner wall of the three-way reversing valve excessively is avoided, and the service life of the curve coal falling pipe is prolonged conveniently.

Description

Technical Field

[0001] The present application relates to the technical field of solid material conveying equipment, and in particular to a curved coal dropping pipe. Background Art

[0002] Coal drop pipe is a general term for coal transportation pipelines in industries such as coal, ports, thermal power, coal dump stations, coal washing plants, and coal-fired industrial boilers.

[0003] In the traditional coal transportation system, the coal drop pipe and the head funnel are usually planned as standard components without considering the material throwing curve and its movement trajectory inside the coal drop pipe. Although this planning method is simple, it has some problems. In the process of conveying raw coal, the coal flow enters the coal drop pipe from the head funnel, and generates huge impact force during the movement, causing damage to the head funnel and the coal drop pipe, seriously reducing the service life of the coal drop pipe. Summary of the invention

[0004] In order to increase the service life of the coal drop pipe, the present application provides a curved coal drop pipe.

[0005] The curved coal dropping pipe provided in this application adopts the following technical solution:

[0006] A curved coal dropping pipe comprises: a head shield, a head funnel, a three-way reversing valve and two curved coal dropping pipe bodies; the head shield is arranged above the head funnel; the side walls of the head shield and the head funnel are provided with coal inlets, and the coal inlets are used to connect with a coal conveying belt;

[0007] The three-way reversing valve comprises a feed chamber, a first discharge chamber, a second discharge chamber and a rotating baffle, wherein the feed chamber is fixedly connected to the output end of the head hopper, the first discharge chamber and the second discharge chamber are respectively located below the feed chamber, and the rotating baffle can rotate in the feed chamber, and the rotating baffle is used to realize the communication between the feed chamber and the first discharge chamber or the communication between the feed chamber and the second discharge chamber;

[0008] The two curved coal dropping pipe bodies are fixedly connected to the first discharge cavity and the second discharge cavity respectively;

[0009] A flow guide device is provided in the head funnel, and the flow guide device is used to ensure that the material is in a centered position when falling; the flow guide device includes a flow guide baffle and an adjustment component; one end of the flow guide baffle is rotatably set in the inner cavity of the head funnel, and the other end abuts against the adjustment component, and the adjustment component is used to adjust the inclination angle of the flow guide baffle in the head funnel.

[0010] By adopting the above technical scheme, the coal conveyor belt conveys the raw coal from the coal inlet to the head hopper, and the raw coal falls from the head funnel into the feed chamber of the three-way reversing valve, and rotates in the feed chamber by rotating the baffle plate, so that the feed chamber is connected with the first discharge chamber or the feed chamber is connected with the second discharge chamber, and the raw coal falls from the first discharge chamber or the second discharge chamber, and is discharged through the curved coal dropping pipe body below the first discharge chamber or the second discharge chamber; the guide device is set, after the coal enters the head funnel from the coal conveyor belt, the guide baffle plate changes the flow direction of the raw coal, reduces the impact force of the coal flow, and makes the raw coal in the center position when falling, avoiding excessive impact of the coal flow on the inner wall of the head funnel and the three-way reversing valve, resulting in damage to the head funnel and the three-way reversing valve, thereby facilitating improving the service life of the curved coal dropping pipe.

[0011] In a specific possible implementation scheme, the two opposite side walls of the head funnel are provided with multiple groups of mounting holes, each group of the mounting holes is provided with two, and the two mounting holes are symmetrically arranged, the guide baffle is provided with a guide groove, the guide groove is streamlined, and the guide baffle is fixedly provided with a reinforcing rib plate on the side wall away from the guide groove, the reinforcing rib plate is provided with a rotating shaft, the rotating shaft passes through the reinforcing rib plate, and the rotating shaft is arranged near the top of the reinforcing rib plate;

[0012] The plurality of groups of mounting holes are evenly arranged along the height direction of the side wall of the head funnel;

[0013] Both ends of the rotating shaft penetrate through the two mounting holes; and the guide baffle can rotate around the rotating shaft.

[0014] By adopting the above technical solution, the guide baffle is arranged to rotate inside the head funnel through the rotating shaft arranged on the reinforcing rib plate, so as to change the angle of the guide baffle, thereby changing the inclination of the guide groove, and the coal flow slides down along the guide groove, changing the flow direction of the coal flow, thereby avoiding the coal flow from causing a large impact on the head funnel and the three-way regulating valve; at the same time, the multiple groups of mounting holes are arranged to facilitate the adjustment of the installation height of the rotating shaft, thereby adjusting the installation height of the guide baffle, so as to improve the guide effect of the guide baffle.

[0015] In a specific possible implementation scheme, the adjustment assembly includes a screw rod and an adjustment hand wheel; the screw rod abuts against a side of the guide baffle away from the guide groove, and the screw rod is arranged close to the lower end of the guide baffle;

[0016] The screw rod passes through the side wall of the head funnel, and the screw rod is threadedly connected to the side wall of the head funnel, and the adjusting hand wheel is fixedly connected to an end of the screw rod away from the guide baffle.

[0017] By adopting the above technical solution and setting up an adjustment component, when adjusting the angle of the guide baffle, the length of the screw rod extending into the inner cavity of the head funnel is changed by turning the adjustment hand wheel, and the screw rod pushes the guide baffle to rotate around the rotating shaft, so as to facilitate changing the angle of the guide baffle. At the same time, the screw rod supports the guide baffle, thereby improving the stability of the guide baffle and preventing the guide baffle from shaking, which affects the effect of the guide baffle on changing the direction of the coal flow.

[0018] In a specific possible implementation scheme, the three-way reversing valve further includes a mounting seat and a driving motor, wherein the mounting seat is arranged on the outer side wall of the three-way reversing valve, the driving motor is fixedly connected to the mounting seat, a rotating shaft is arranged in the feed chamber, the rotating shaft passes through the two opposite side walls of the three-way reversing valve, and the rotating shaft is rotatably connected to the mounting seat, and the driving motor is used to drive the rotating shaft to rotate in the feed chamber; the end of the rotating baffle is fixedly connected to the rotating shaft, and the rotating shaft is used to drive the rotating baffle to rotate in the feed chamber;

[0019] The rotating baffle is used to block the first discharge cavity or the second discharge cavity.

[0020] By adopting the above technical solution, a three-way reversing valve is set up, and the driving motor is started according to the path that the coal flow needs to be transported. The driving motor drives the rotating shaft to rotate, and the rotating shaft drives the rotating baffle to rotate in the feed chamber. The rotating baffle blocks the first discharge chamber or the second discharge chamber, which is convenient for changing the transportation path of the coal flow, so that the coal flow flows down the coal pipe body from different curves.

[0021] In a specific possible implementation manner, the head shield is provided with a dust curtain, and the dust curtain is fixedly connected to the lower edge of the top wall of the head shield.

[0022] By adopting the above technical solution, a dust curtain is set up, which can block the smoke and dust generated by the coal flow after the coal flow enters the coal inlet, so as to prevent the smoke and dust from being discharged from the head shield, thereby preventing pollution to the environment.

[0023] In a specific possible implementation scheme, the curved coal dropping pipe body comprises multiple sections of hollow connecting tubes, the multiple sections of the connecting tubes are connected end to end in sequence, and the top and bottom of the connecting tubes are both provided with sealing flanges, and two adjacent connecting tubes are fixedly connected by the sealing flanges;

[0024] The wall profiles of the multiple sections of the connecting tube are all streamlined, and the contour curvature of each section of the connecting tube is different.

[0025] By adopting the above technical solution, the multi-section connecting barrel is fixedly connected by a sealing flange, which improves the connection stability of the connecting barrel. At the same time, the barrel wall profile of the multi-section connecting barrel is streamlined, so that the coal flow slides in an orderly and concentrated manner in the connecting barrel, which is convenient for reducing the outlet speed of the material and reducing the impact on the equipment, thereby increasing the service life of the coal drop pipe; in addition, the streamlined barrel wall profile can also reduce the generation of induced wind when the raw coal flows, thereby facilitating the reduction of dust generation.

[0026] In a specific possible implementation manner, a side wall of the connecting tube is provided with an inspection window.

[0027] By adopting the above technical solution, the inspection window is provided, which facilitates observation and inspection when the connecting tube is blocked, thereby ensuring the normal operation of the coal drop pipe.

[0028] In a specific possible implementation manner, the inner wall of the connecting cylinder is evenly paved with wear-resistant lining plates, and the wear-resistant lining plates have a uniform thickness.

[0029] By adopting the above technical solution, the wear-resistant lining is set to improve the wear resistance of the connecting tube, thereby increasing the service life of the coal drop pipe. At the same time, the raw coal collides with the wear-resistant lining multiple times in the connecting tube to reduce the outlet speed of the raw coal, thereby reducing the impact on the equipment.

[0030] In a specific possible implementation mode, the bottoms of the two curved coal dropping pipes are respectively provided with sealed material guiding grooves.

[0031] By adopting the above technical solution, a sealed material guide chute is set up, and after the raw coal flows out from the curved coal drop pipe body, the sealed material guide chute transports the raw coal to the next work section, thereby facilitating the transportation of the raw coal.

[0032] In summary, the present application includes at least one of the following beneficial technical effects:

[0033] 1. The guide device is set up. After the coal enters the head funnel from the coal conveyor belt, the guide baffle changes the flow direction of the raw coal, reduces the impact force of the coal flow, and makes the raw coal in the center position when falling, avoiding the coal flow from causing excessive impact on the head funnel and the inner wall of the three-way reversing valve, causing damage to the head funnel and the three-way reversing valve, thereby facilitating the improvement of the service life of the curved coal drop pipe.

[0034] 2. The multi-section connecting tube is fixedly connected by a sealing flange, which improves the connection stability of the connecting tube. At the same time, the wall profile of the multi-section connecting tube is streamlined, so that the coal flow slides in an orderly and concentrated manner in the connecting tube, which is convenient for reducing the outlet speed of the material and reducing the impact on the equipment, thereby increasing the service life of the coal drop pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application.

[0036] Figure 1 It is a schematic diagram of the overall structure of a curved coal drop pipe in an embodiment of the present application.

[0037] Figure 2 It is a schematic diagram of a head shield of a curved coal drop pipe according to an embodiment of the present application.

[0038] Figure 3 It is a schematic diagram of a head funnel of a curved coal drop pipe according to an embodiment of the present application.

[0039] Figure 4 It is a schematic diagram of a guide baffle of a curved coal drop pipe according to an embodiment of the present application.

[0040] Figure 5 It is a schematic diagram of a three-way reversing valve of a curved coal drop pipe according to an embodiment of the present application.

[0041] Figure 6 It is a cross-sectional view of a three-way reversing valve of a curved coal drop pipe according to an embodiment of the present application.

[0042] Figure 7 It is a schematic diagram of a connecting tube of a curved coal drop pipe in an embodiment of the present application.

[0043] Description of the drawings: 1. Head shield; 11. Coal inlet; 12. Dust curtain; 2. Head funnel; 21. Guide device; 211. Guide baffle; 2111. Guide trough; 2112. Reinforcement rib plate; 2113. Rotating shaft; 212. Adjustment assembly; 2121. Screw rod; 2122. Adjustment hand wheel; 22. Mounting hole; 3. Three-way reversing valve; 31. Feed chamber; 32. First discharge chamber; 33. Second discharge chamber; 34. Rotating baffle; 35. Mounting seat; 36. Drive motor; 37. Rotating shaft; 4. Curved coal drop pipe body; 41. Connecting tube; 411. Sealing flange; 412. Inspection window; 5. Sealed guide trough. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of this application, unless otherwise specified, "plurality" means two or more.

[0046] The following is combined with Figure 1-7 This application is described in further detail.

[0047] The embodiment of the present application discloses a curved coal dropping pipe.

[0048] Reference Figure 1 A curved coal-dropping pipe, comprising: 1. A curved coal-dropping pipe, characterized in that it comprises: a head shield 1, a head funnel 2, a three-way reversing valve 3, a curved coal-dropping pipe body 4 and a sealed material guide trough 5; the head funnel 2 is arranged below the head shield 1, and the head funnel 2 is connected to the inner cavity of the head shield 1; a coal inlet 11 is provided on the same side wall of the head shield 1 and the head funnel 2, and the coal inlet 11 is connected to a coal conveying belt; the three-way reversing valve 3 is arranged below the head funnel 2 The three-way reversing valve 3 is connected to the inner cavity of the head funnel 2; the three-way reversing valve 3 includes a feed cavity 31, a first discharge cavity 32 and a second discharge cavity 33, the feed cavity 31 is arranged near the bottom end of the head funnel 2, the first discharge cavity 32 and the second discharge cavity 33 are respectively arranged below the feed cavity 31; the two curved coal dropping pipe bodies 4 are respectively connected to the lower ends of the first discharge cavity 32 and the second discharge cavity 33, and the two sealed guide grooves 5 are respectively arranged at the output ends of the two curved coal dropping pipe bodies 4.

[0049] Reference Figure 2 A dust curtain 12 is provided at the lower edge of the top wall of the head shield 1. After the coal flow enters the coal inlet 11 from the coal conveyor belt, the dust curtain 12 can block the smoke and dust to prevent the smoke and dust from entering the external environment from the head shield 1 and causing environmental pollution.

[0050] Reference Figure 3 and Figure 4A flow guide device 21 is provided in the head funnel 2, and the flow guide device 21 includes a flow guide baffle 211 and an adjustment component 212; one end of the flow guide baffle 211 is rotatably arranged in the inner cavity of the head funnel 2, and the other end is abutted against the adjustment component 212, and a flow guide groove 2111 is provided on the flow guide baffle 211, and the flow guide groove 2111 is streamlined, and a reinforcing rib plate 2112 is fixedly provided on the side wall of the flow guide baffle 211 away from the guide groove 2111, and a rotating shaft 2113 is provided on the reinforcing rib plate 2112, and the rotating shaft 2113 passes through the reinforcing rib plate 2112, and the rotating shaft 2113 is arranged near the top of the reinforcing rib plate 2112; a plurality of groups of mounting holes 22 are provided on the opposite side walls of the head funnel 2, and each group of mounting holes 22 is provided with two, and the two mounting holes 22 are symmetrically arranged, and the two ends of the rotating shaft 2113 are symmetrically arranged. The end passes through two mounting holes 22; the rotating shaft 2113 can rotate in the head funnel 2; multiple groups of mounting holes 22 are evenly arranged along the height direction of the side wall of the head funnel 2; the rotating shaft 2113 can pass through the mounting holes 22 at different heights to facilitate the height adjustment of the guide baffle 211, thereby enhancing the guide effect of the guide baffle 211; the adjustment component 212 includes a screw rod 2121 and an adjusting hand wheel 2122; the screw rod 2121 abuts against the side of the guide baffle 211 away from the guide groove 2111, and the screw rod 2121 is arranged close to the lower end of the guide baffle 211; the screw rod 2121 passes through the side wall of the head funnel 2, and the screw rod 2121 is threadedly connected to the side wall of the head funnel 2, and the adjusting hand wheel 2122 is fixedly connected to the end of the screw rod 2121 away from the guide baffle 211.

[0051] Reference Figure 5 and Figure 6 The three-way reversing valve 3 also includes a mounting seat 35, a driving motor 36 and a rotating baffle 34. The mounting seat 35 is arranged on the outer wall of the three-way reversing valve 3, and the driving motor 36 is fixedly connected to the mounting seat 35. A rotating shaft 37 is arranged in the feed chamber 31. The rotating shaft 37 passes through the two opposite side walls of the three-way reversing valve 3, and the rotating shaft 37 is rotatably connected to the mounting seat 35. The end of the rotating baffle 34 is fixedly connected to the side wall of the rotating shaft 37 along the axial direction. The rotating baffle 34 can rotate synchronously with the rotating shaft 37, and the rotating baffle 34 can block the first discharge chamber 32 or the second discharge chamber 33.

[0052] Reference Figure 7The curved coal dropping pipe body 4 includes a plurality of hollow connecting tubes 41, which are connected end to end in sequence, and a sealing flange 411 is provided at the top and the bottom of the connecting tube 41, and two adjacent connecting tubes 41 are fixedly connected by the sealing flange 411; the wall contours of the plurality of connecting tubes 41 are streamlined, and the contour curvature of each connecting tube 41 is different; an inspection window 412 is provided on the side wall of the connecting tube 41, and a wear-resistant lining is evenly laid on the inner wall of the connecting tube 41, and the thickness of the wear-resistant lining is uniform. The coal collides with the wear-resistant lining several times during its falling process in the connecting tube 41, thereby reducing the outlet speed of the coal and avoiding damage to the sealing guide trough 5.

[0053] In particular, the contour curves of the guide groove 2111 and the connecting tube 41 can be simulated by E-DEM discrete simulation software to facilitate the diversion of raw coal and ensure that the coal flows smoothly along the inner walls of the guide groove 2111 and the connecting tube 41. At the same time, it can also reduce the generation of induced wind and reduce the impact on the coal drop pipe, thereby increasing the service life of the coal drop pipe.

[0054] The implementation principle of a curved coal dropping pipe of the present application is as follows: the coal conveyor belt conveys the raw coal from the coal inlet 11 to the head funnel 2, and the dust curtain 12 of the head protective cover 1 blocks the smoke and dust generated by the coal material to prevent it from spreading to the external environment; after the raw coal enters the head funnel 2, the adjusting hand wheel 2122 is turned to rotate the screw rod 2121, and the length of the screw rod 2121 extending into the head funnel 2 changes accordingly, and the screw rod 2121 pushes the guide baffle 211 to rotate around the rotating shaft 2113, so that the inclination angle of the guide groove 2111 changes accordingly, and the guide groove 2111 changes the flow direction of the raw coal, reduces the impact force of the coal flow, and makes the raw coal in the center position when falling, so as to avoid the coal flow from causing excessive impact on the inner wall of the head funnel 2 and the three-way reversing valve 3, resulting in damage to the head funnel 2 and the three-way reversing valve 3, thereby facilitating the improvement of the service life of the curved coal dropping pipe, and the coal flow along the guide groove 2111 The coal flows downward into the feed chamber 31 of the three-way reversing valve 3, and the driving motor 36 is started. The driving motor 36 drives the rotating shaft 37 to rotate, and the rotating shaft 37 drives the rotating baffle 34 to rotate in the feed chamber 31. After the rotating baffle 34 rotates to a certain angle, the first discharge chamber 32 or the second discharge chamber 33 is blocked, and the coal flow flows down from the opened second discharge chamber 33 or the first discharge chamber 32 and enters the curved coal dropping pipe body 4. The coal flow flows downward along the streamlined inner cavity of the curved coal dropping pipe body 4. The curved coal dropping pipe body 4 changes the flow direction of the coal flow, so that the outlet speed of the coal flow is reduced, and the impact force on the sealing guide groove 5 is reduced. At the same time, the wear-resistant lining plate arranged on the inner wall of the connecting tube 41 enhances the wear resistance of the curved coal dropping pipe body 4 to extend the service life of the curved coal dropping pipe body 4; when the connecting tube 41 is blocked, the connecting tube 41 can be dredged through the inspection window 412 to ensure the normal operation of the coal dropping pipe.

[0055] The above embodiments are only used to illustrate the technical solution of the present application, but not to limit it. The present application is not limited to the exact structure described above and illustrated in the accompanying drawings, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, various changes and modifications made without departing from the concept of the present application should be deemed to belong to the protection scope of the present application.

Claims

1. A curved coal dropping pipe, characterized in that: include: A head guard (1), a head hopper (2), a three-way reversing valve (3) and two curved coal dropping pipes (4); the head guard (1) is arranged above the head hopper (2); the side walls of the head guard (1) and the head hopper (2) are provided with a coal inlet (11), and the coal inlet (11) is used to connect to a coal conveying belt; The three-way reversing valve (3) comprises a feed chamber (31), a first discharge chamber (32), a second discharge chamber (33) and a rotating baffle (34); the feed chamber (31) is fixedly connected to the output end of the head hopper (2); the first discharge chamber (32) and the second discharge chamber (33) are respectively located below the feed chamber (31); the rotating baffle (34) can rotate in the feed chamber (31); and the rotating baffle (34) is used to realize the communication between the feed chamber (31) and the first discharge chamber (32) or the communication between the feed chamber (31) and the second discharge chamber (33); The two curved coal dropping pipe bodies (4) are fixedly connected to the first discharge cavity (32) and the second discharge cavity (33) respectively; A flow guide device (21) is arranged in the head funnel (2), and the flow guide device (21) is used to ensure that the material is in a central position when falling; the flow guide device (21) comprises a flow guide baffle (211) and an adjustment component (212); one end of the flow guide baffle (211) is rotatably arranged in the inner cavity of the head funnel (2), and the other end is in contact with the adjustment component (212); the adjustment component (212) is used to adjust the inclination angle of the flow guide baffle (211) in the head funnel (2).

2. The curved coal drop pipe according to claim 1, characterized in that: The head funnel (2) has a plurality of groups of mounting holes (22) on opposite side walls, each group of the mounting holes (22) is provided with two, and the two mounting holes (22) are symmetrically arranged; the guide baffle (211) is provided with a guide groove (2111), the guide groove (2111) is streamlined, and a reinforcing rib plate (2112) is fixedly arranged on the side wall of the guide baffle (211) away from the guide groove (2111); a rotating shaft (2113) is arranged on the reinforcing rib plate (2112), the rotating shaft (2113) passes through the reinforcing rib plate (2112), and the rotating shaft (2113) is arranged close to the top of the reinforcing rib plate (2112); A plurality of groups of mounting holes (22) are evenly arranged along the height direction of the side wall of the head funnel (2); Both ends of the rotating shaft (2113) pass through the two mounting holes (22); the flow guide baffle (211) can rotate around the rotating shaft (2113).

3. The curved coal dropping pipe according to claim 1, characterized in that: The adjustment component (212) comprises a screw rod (2121) and an adjustment hand wheel (2122); the screw rod (2121) abuts against a side of the guide baffle (211) away from the guide groove (2111), and the screw rod (2121) is arranged close to the lower end of the guide baffle (211); The screw rod (2121) passes through the side wall of the head funnel (2), and the screw rod (2121) is threadedly connected to the side wall of the head funnel (2), and the adjusting hand wheel (2122) is fixedly connected to an end of the screw rod (2121) away from the guide baffle (211).

4. The curved coal drop pipe according to claim 1, characterized in that: The three-way reversing valve (3) further comprises a mounting seat (35) and a driving motor (36), wherein the mounting seat (35) is arranged on the outer side wall of the three-way reversing valve (3), and the driving motor (36) is fixedly connected to the mounting seat (35); a rotating shaft (37) is arranged in the feeding chamber (31), and the rotating shaft (37) passes through two opposite side walls of the three-way reversing valve (3), and the rotating shaft (37) is rotatably connected to the mounting seat (35), and the driving motor (36) is used to drive the rotating shaft (37) to rotate in the feeding chamber (31); an end of the rotating baffle (34) is fixedly connected to the rotating shaft (37), and the rotating shaft (37) is used to drive the rotating baffle (34) to rotate in the feeding chamber (31); The rotating baffle (34) is used to block the first discharge cavity (32) or the second discharge cavity (33).

5. The curved coal drop pipe according to claim 1, characterized in that: The head protection cover (1) is provided with a dust-proof curtain (12), and the dust-proof curtain (12) is fixedly connected to the lower edge of the top wall of the head protection cover (1).

6. The curved coal dropping pipe according to claim 1, characterized in that: The curved coal dropping pipe body (4) comprises a plurality of hollow connecting tubes (41), the plurality of connecting tubes (41) are connected end to end in sequence, and the top and bottom of the connecting tubes (41) are both provided with sealing flanges (411), and two adjacent connecting tubes (41) are fixedly connected via the sealing flanges (411); The wall profiles of the multiple sections of the connecting tube (41) are all streamlined, and the curvature of the profile of each section of the connecting tube (41) is different.

7. The curved coal dropping pipe according to claim 6, characterized in that: The side wall of the connecting tube (41) is provided with an inspection window (412).

8. The curved coal dropping pipe according to claim 6, characterized in that: The inner wall of the connecting tube (41) is evenly paved with a wear-resistant lining plate, and the wear-resistant lining plate has a uniform thickness.

9. The curved coal dropping pipe according to claim 1, characterized in that: The bottoms of the two curved coal dropping pipe bodies (4) are respectively provided with sealed material guiding grooves (5).

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