Coal blockage monitoring device and coal falling barrel structure

Abstract

The utility model discloses a coal blockage monitoring device and a coal falling barrel structure. The coal blockage monitoring device comprises a mounting bracket, a swing plate, an electric cabinet and an alarm, the upper end of the swing plate is connected with the main shaft section of the pivot shaft, the swing plate and the pivot shaft can rotate integrally, and the swing plate is used for stretching into the coal falling opening. The electric control box is installed on a platform of a coal falling opening, and a control module, a pair of proximity switches and a plurality of pairs of metal sheets are arranged in the electric control box. And the proximity switch and the alarm are respectively in signal connection with the control module. According to the coal blockage monitoring device and the coal falling barrel structure, whether the coal falling opening is blocked or not can be monitored in time, electric appliance elements can be effectively prevented from being collided and damaged by falling coal, the reminding performance of a product is improved, and the service life of the product is also prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of coal blockage monitoring, in particular to a coal blockage monitoring device and a coal dropping chute structure. Background Art

[0002] In the field of coal mining technology, a belt conveyor is used to transport coal. One end of the belt conveyor is the coal dropping port of the coal dropping chute. Coal falls into the coal dropping chute through the coal dropping port and then enters the next-stage belt conveyor or the next-stage process.

[0003] In the prior art, a monitoring device is installed at the coal dropping port to monitor whether the coal dropping port is blocked. If blockage occurs, a prompt will be given, and manual dredging of the blocked coal dropping port is required to avoid affecting the normal transportation of the machine.

[0004] Chinese invention patent with publication number CN116853792A discloses a coal blockage detection device for a belt coal dropping port, including a conveyor belt body and a coal dropping port body. The top end of the coal dropping port body is fixedly connected with a fixed mounting frame, and the top end of the fixed mounting frame is fixedly connected with a connection detection mechanism. The connection detection mechanism includes a fixed mounting top plate, and the end of the fixed mounting top plate is fixedly connected with a fixed connection plate. One end of the bottom of the connection mounting plate is fixedly connected with a first mounting frame, and an infrared emitter is movably connected inside the first mounting frame. The other end of the bottom of the connection mounting plate is fixedly connected with a second mounting frame, and an infrared receiver is movably connected inside the second mounting frame. The mutual cooperation between the infrared emitter and the infrared receiver can timely detect the coal dropping situation of the coal dropping port body. When coal blockage occurs, the coal will block the infrared rays, so that the coal blockage situation can be timely detected, and the operation is convenient.

[0005] The defects of the above scheme in the prior art are as follows: Since infrared emitters and infrared receivers are used for detection, it is necessary for the coal to accumulate to a relatively high level to block the infrared ray propagation path between the infrared emitters and infrared receivers. The blockage monitoring will be lagged and not timely enough. The infrared emitters and infrared receivers are installed inside the frame and are easily damaged by the accumulated coal being collided. Summary of the Utility Model

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art, and provide a coal blockage monitoring device and a coal dropping chute structure. By using the combination of a swing plate, a pivot shaft, a metal sheet, a proximity switch and a control module, it can timely monitor whether the coal dropping port is blocked. The electric control box is arranged outside the coal dropping port, which can effectively prevent the electrical components from being damaged by the falling coal, improve the reminder performance of the product, and also extend the service life of the product.

[0007] The technical solution of the present utility model provides a coal blocking monitoring device for installation at a coal dropping port, including a mounting bracket for mounting on the platform of the coal dropping port, a swing plate for extending into the coal dropping port, an electric control box for mounting on the platform, and an alarm for alarming;

[0008] The mounting bracket is connected with a pivot shaft, the pivot shaft includes a main shaft section and a sub-shaft section connected to one end of the main shaft section, the main shaft section is pivotally connected with the mounting bracket, and the sub-shaft section is pivotally connected in the electric control box;

[0009] The upper end of the swing plate is connected with the main shaft section, and the swing plate can rotate integrally with the pivot shaft;

[0010] The electric control box is provided with a control module, a pair of proximity switches and multiple pairs of metal sheets. The two proximity switches are arranged on opposite sides of the sub-shaft section, and the multiple pairs of metal sheets are evenly arranged along the circumferential direction of the sub-shaft section;

[0011] The alarm and the proximity switches are respectively signal-connected to the control module.

[0012] In one alternative technical solution, the proximity switch includes an opening for the metal sheet to pass through.

[0013] In one alternative technical solution, the box wall of the electric control box is provided with a ventilation opening.

[0014] In one alternative technical solution, the alarm is mounted on the box wall of the electric control box.

[0015] In one alternative technical solution, the mounting bracket includes two side brackets arranged at intervals and a bracket top plate;

[0016] The side bracket includes a side bracket bottom plate for connecting with the platform and a side bracket vertical plate connected with the side bracket bottom plate, and the bracket top plate is connected between the upper ends of the two side bracket vertical plates;

[0017] The main shaft section is located below the bracket top plate and is pivotally connected with the two side bracket vertical plates.

[0018] In one alternative technical solution, the bottom of the electric control box is provided with a mounting groove, and the side bracket bottom plate close to the electric control box is inserted into the mounting groove.

[0019] In one alternative technical solution, the swing plate is a rubber plate.

[0020] In one alternative technical solution, a connecting sleeve is sleeved on the main shaft section, two clamping plates are connected to the bottom of the connecting sleeve, and multiple fastening pieces are connected between the two clamping plates;

[0021] The upper end of the swing plate is provided with a swing plate through hole for the fastener to pass through;

[0022] The upper end of the swing plate is connected between the two clamping plates, and the fastener passes through the swing plate through hole.

[0023] The technical solution of the present utility model also provides a coal chute structure, including a coal chute and the coal blockage monitoring device described in any one of the foregoing technical solutions;

[0024] The top of the coal chute has a coal dropping port, and the platform is provided at the edge of the coal dropping port;

[0025] The mounting bracket and the electric control box are respectively installed on the platform. The swing plate extends downward into the coal dropping port and can swing in the coal dropping port.

[0026] In an optional technical solution, the coal dropping port is in the shape of a flared mouth with a wider upper part and a narrower lower part.

[0027] Adopting the above technical solution, the following beneficial effects are achieved:

[0028] The coal blockage monitoring device and the coal chute structure provided by the present utility model include a mounting bracket, a swing plate, an electric control box and an alarm. The upper end of the swing plate is connected to the main shaft section of the pivot shaft. The swing plate can rotate integrally with the pivot shaft and is used to extend into the coal dropping port. The electric control box is installed on the platform of the coal dropping port. The electric control box is provided with a control module, a pair of proximity switches and multiple pairs of metal sheets. The proximity switches and the alarm are respectively connected to the control module in signal.

[0029] Since the electric control box is located outside the coal dropping port and will not be touched by coal, it can effectively prevent the electronic components from being damaged by the impact of the falling coal, and improves the service life of the product.

[0030] During monitoring, the swing plate is swung by the impact of the falling coal, and then drives the metal sheet to swing through the pivot shaft, so as to be sensed by the proximity switch. The proximity switch sends an intermittent signal to the control module. At this time, it is judged that the coal dropping port is unblocked and there is no blockage.

[0031] When the coal dropping port is blocked, the swing plate is blocked by the accumulated falling coal and no longer swings. At this time, either the metal sheet leaves the sensing range of the proximity switch and the proximity switch continuously does not send a signal, or the metal sheet corresponds and cooperates with the proximity switch and the proximity switch continuously sends a signal. Then the control module judges that the coal dropping port is blocked, and the control module controls the alarm to send an alarm to timely remind the staff to dredge the coal dropping port, improving the reminder performance of the product.

[0032] In summary, the coal blockage monitoring device and the coal chute structure provided by the present utility model can timely monitor whether the coal discharging port is blocked, effectively avoid the damage of electrical components caused by the impact of falling coal, improve the reminder performance of the product, and also extend the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Referring to the drawings, the disclosure of the present utility model will become more understandable. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present utility model. In the drawings:

[0034] Figure 1 is a perspective view of the coal blockage monitoring device provided by an embodiment of the present utility model;

[0035] Figure 2 is a perspective view of the pivot shaft, mounting bracket and swing plate assembled together;

[0036] Figure 3 is Figure 2 exploded view of;

[0037] Figure 4 is a cross-sectional view of the upper end of the swing plate connected between two clamping plates below the connecting sleeve;

[0038] Figure 5 is a cross-sectional view of the upper end of the swing plate provided with a swing plate through hole;

[0039] Figure 6 is a perspective view of the auxiliary shaft section and the electric control box assembled together;

[0040] Figure 7 is Figure 6 cross-sectional view along the horizontal plane where the auxiliary shaft section is located;

[0041] Figure 8 is a schematic diagram when the metal sheet and the proximity switch are in an induction state;

[0042] Figure 9 is a schematic diagram when the metal sheet and the proximity switch are in a separated state;

[0043] Figure 10 is a perspective view of the proximity switch;

[0044] Figure 11 is a perspective view of the coal chute;

[0045] Figure 12 is a perspective view of the coal chute structure provided by an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] The specific embodiments of the present utility model will be further described below in conjunction with the accompanying drawings. The same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component respectively.

[0047] As Figures 1-3 , Figures 6-9 and Figures 11-12 shown, a coal blockage monitoring device provided by an embodiment of the present utility model is used to be installed on the coal dropping port 71, and includes a mounting bracket 1 for being installed on the platform 72 of the coal dropping port 71, a swing plate 2 for extending into the coal dropping port 71, an electric control box 3 for being installed on the platform 72, and an alarm 4 for alarming.

[0048] The mounting bracket 1 is connected with a pivot shaft 5. The pivot shaft 5 includes a main shaft section 51 and a sub-shaft section 52 connected to one end of the main shaft section 51. The main shaft section 51 is pivotally connected to the mounting bracket 1, and the sub-shaft section 52 is pivotally connected in the electric control box 3.

[0049] The upper end of the swing plate 2 is connected to the main shaft section 51, and the swing plate 2 can rotate integrally with the pivot shaft 5.

[0050] A control module 33, a pair of proximity switches 34 and multiple pairs of metal sheets 35 are provided in the electric control box 3. The two proximity switches 34 are arranged on opposite sides of the sub-shaft section 52, and the multiple pairs of metal sheets 35 are evenly arranged along the circumferential direction of the sub-shaft section 52.

[0051] The alarm 4 and the proximity switches 34 are respectively connected to the control module 33 in a signal manner.

[0052] The coal blockage monitoring device provided by the present utility model is used to be installed on the coal dropping port 71 at the top of the coal dropping cylinder 7. The periphery of the coal dropping port 71 has a platform 72, and the coal blockage monitoring device is installed on the platform 72.

[0053] The coal blockage monitoring device includes a mounting bracket 1, a swing plate 2, an electric control box 3, an alarm 4, a pivot shaft 5, etc. The mounting bracket 1 is used to be installed on the platform 72 and straddle the coal dropping port 71. The electric control box 3 is used to be installed on the platform 72 on one side of the coal dropping port 71.

[0054] The pivot shaft 5 is pivotally connected to the mounting bracket 1. The pivot shaft 5 includes a main shaft section 51 and a sub-shaft section 52. The main shaft section 51 is pivotally connected to the mounting bracket 1, and the main shaft section 51 can be connected to the mounting bracket 1 through a bearing. The sub-shaft section 52 is integrally connected to one end of the main shaft section 51, and it is located outside the mounting bracket 1 and extends towards the electric control box 3. The sub-shaft section 52 extends into the electric control box 3, and the sub-shaft section 52 is connected to the box wall of the electric control box 3 through a bearing.

[0055] The upper end of the swing plate 2 is connected to the main shaft section 51. The swing plate 2 can rotate integrally with the pivot shaft 5, and the swing plate 2 is used to extend into the coal dropping port 71. In the normal state, the swing plate 2 is arranged vertically, and its lower end extends into the coal dropping port 71. When the coal falling into the coal dropping port collides with the swing plate 2, the swing plate 2 will swing, and the pivot shaft 5 will rotate accordingly. After the coal leaves the swing plate 2, under the action of gravity, the swing plate 2 will reset to the vertically downward arrangement state.

[0056] The electric control box 3 is provided with a control module 33, a pair of proximity switches 34 and multiple pairs of metal sheets 35.

[0057] The control module 33 can adopt a controller, a chip, a control circuit board, etc.

[0058] The two proximity switches 34 are arranged horizontally and symmetrically on the left and right sides of the auxiliary shaft section 52.

[0059] The proximity switch 34 is a switch that can sense metal objects. When the proximity switch 34 senses that a metal object is approaching, the circuit inside the proximity switch 34 will be triggered and an electrical signal will be output. When the metal object leaves the sensing range of the proximity switch 34, the circuit inside the proximity switch 34 will automatically disconnect and the output electrical signal will disappear.

[0060] Multiple pairs of metal sheets 35 are connected to the auxiliary shaft section 52. Preferably, two pairs of metal sheets 35 are used. Each pair of metal sheets 35 is symmetrically arranged on the opposite sides of the auxiliary shaft section 52, and multiple pairs of metal sheets 35 are arranged at equal intervals along the circumferential direction of the auxiliary shaft section 52. The metal sheets 35 can adopt iron sheets.

[0061] When the swing plate 2 is arranged vertically, the metal sheets 35 leave the proximity switch 34 and the sensing range of the proximity switch 34. When the swing plate 2 swings by a certain angle, the metal sheets 35 will pass by the proximity switch 34 or enter the sensing range of the proximity switch 34, so that they are sensed by the proximity switch 34 and the proximity switch 34 outputs a signal.

[0062] The proximity switch 34 and the alarm 4 are respectively connected to the control module 33 by signal. When the proximity switch 34 senses the metal sheet 35, it will send a signal to the control module 33. When the control module 33 does not receive the output signal of the proximity switch 34 for a period of time, or when the control module 33 continuously receives the output signal of the proximity switch 34, the control module 33 controls the alarm 4 to give an alarm.

[0063] The alarm 4 can adopt an audible and visual alarm.

[0064] In the present utility model, since the electric control box 3 is located outside the coal dropping port 71 and will not be touched by the coal, it can effectively prevent the electronic devices from being damaged by the falling coal, and improves the service life of the product.

[0065] In the present utility model, during monitoring, the swing plate 2 swings when impacted by falling coal, and then drives the metal sheet 35 to swing through the pivot shaft 5. The metal sheet 35 will be sensed by the proximity switch 34, and the proximity switch 34 sends intermittent signals to the control module 33. At this time, it is determined that the coal dropping port 71 is unobstructed.

[0066] When the coal dropping port 71 is blocked, the swing plate 2 is blocked by the accumulated falling coal and stops swinging. At this time, either the metal sheet 35 leaves the sensing range of the proximity switch 34 and the proximity switch 34 continuously does not send signals, or it corresponds and cooperates with the proximity switch 34, and the proximity switch 34 continuously sends signals. Then the control module 33 determines that the coal dropping port 71 is blocked, and the control module 33 controls the alarm 4 to give an alarm, timely reminding the staff to dredge the coal dropping port 71, improving the reminder performance of the product.

[0067] In summary, the coal blockage monitoring device provided by the present utility model can timely monitor whether the coal dropping port 71 is blocked, effectively avoid the electrical components of the electric control box from being damaged by the impact of falling coal, improve the reminder performance of the product, and also extend the service life of the product.

[0068] In one embodiment, as Figures 7-10 shown, the proximity switch 34 includes an opening 351 for the metal sheet 35 to pass through. When the rotating metal sheet 35 passes through the opening 351, it can be more easily sensed by the proximity switch 34.

[0069] In one embodiment, as Figure 1 shown, the electric control box 3 is provided with a ventilation opening 31 on its box wall, which has a ventilation and heat dissipation effect.

[0070] In one embodiment, as Figure 1 shown, the alarm 4 is installed on the box wall of the electric control box 3, integrating the alarm 4 with the electric control box 3.

[0071] In one embodiment, as Figures 1-3 shown, the mounting bracket 1 includes two side brackets 11 arranged at intervals and a bracket top plate 12.

[0072] The side bracket 11 includes a side bracket bottom plate 111 for connecting with the platform 72 and a side bracket vertical plate 112 connected to the side bracket bottom plate 111. The bracket top plate 12 is connected between the upper ends of the two side bracket vertical plates 112.

[0073] The main shaft section 51 is located below the bracket top plate 12 and is pivotally connected to the two side bracket vertical plates 112.

[0074] In this embodiment, the mounting bracket 1 includes two L-shaped side brackets 11 and a bracket top plate 12. The side bracket 11 includes a side bracket bottom plate 111 and a side bracket vertical plate 112, and the side bracket vertical plate 112 is integrally connected to the side bracket bottom plate 111 to form an L shape. The side bracket bottom plate 111 is used to connect to the platform 72 for easy installation. The bracket top plate 12 is connected between the upper ends of the two side bracket vertical plates 112, which is beneficial to improving the structural stability. The main shaft section 51 is located below the bracket top plate 12, and the main shaft section 51 is connected to the two side bracket vertical plates 112 through bearings.

[0075] During assembly, the two L-shaped side brackets 11 are installed on the platforms 72 on both sides of the coal drop port 71, and both the bracket top plate 12 and the main shaft section 51 straddle the coal drop port 71 so that the swing plate 2 can extend into the coal drop port 71.

[0076] In one embodiment, as Figure 1 and Figure 6 shown, the bottom of the electric control box 3 is provided with a mounting groove 32, and the side bracket bottom plate 111 close to the electric control box 3 is inserted into the mounting groove 32, which improves the assembly tightness.

[0077] In one embodiment, the swing plate 2 is a rubber plate and has a certain elastic deformation ability. After being collided by coal blocks, it will have a certain energy absorption effect, reducing the probability of being broken by collision.

[0078] In one embodiment, as Figures 1-5 shown, a connecting sleeve 6 is sleeved on the main shaft section 51, and two clamping plates 61 are connected to the bottom of the connecting sleeve 6, and a plurality of fasteners 62 are connected between the two clamping plates 61.

[0079] A swing plate through hole 21 for the fastener 62 to pass through is provided at the upper end of the swing plate 2.

[0080] The upper end of the swing plate 2 is connected between the two clamping plates 61, and the fastener 62 passes through the swing plate through hole 21.

[0081] In this embodiment, a connecting sleeve 6 is sleeved on the main shaft section 51, and the connecting sleeve 6 can be made of a plastic part. Two clamping plates 61 are integrally provided at the lower part of the connecting sleeve 6, and the two clamping plates 61 are connected by a plurality of fasteners 62. A plurality of fasteners 62 are respectively connected between the two clamping plates 61 in the horizontal direction and the vertical direction. The fastener 62 can be a bolt.

[0082] A swing plate through hole 21 for the fastener 62 to pass through is provided at the upper end of the swing plate 2.

[0083] During assembly, the upper end of the swing plate 2 is connected between two clamping plates 61. The fastener 62 passes through the through hole 21 of the swing plate to fasten the upper end of the swing plate 2 between the two clamping plates 61. When the swing plate 2 needs to be replaced later, after removing the fastener 62, replacing the new swing plate 2, and then tightening the fastener 62.

[0084] As Figures 11-12 shown, a coal chute structure provided by an embodiment of the present invention includes a coal chute 7 and the coal blockage monitoring device described in any of the foregoing embodiments.

[0085] The top of the coal chute 7 has a coal inlet 71, and a platform 72 is provided at the edge of the coal inlet 71.

[0086] The mounting bracket 1 and the electric control box 3 are respectively mounted on the platform 72. The swing plate 2 extends downward into the coal inlet 71 and can swing in the coal inlet 71.

[0087] The coal chute structure provided by the present invention is used to be arranged at one end of a belt conveyor, and it has a coal chute 7 and a coal blockage monitoring device.

[0088] Regarding the structure, construction and working principle of the coal blockage monitoring device, please refer to the description part of the coal blockage monitoring device above, and will not be elaborated here.

[0089] The top of the coal chute 7 has a coal inlet 71. The coal transported by the belt conveyor will fall into the coal inlet 71 and then enter the coal chute 7. A platform 72 is provided at the edge of the coal inlet 71. The mounting bracket 1 and the electric control box 3 are respectively mounted on the platform 72. The swing plate 2 extends downward into the coal inlet 71 and can swing in the coal inlet 71.

[0090] During monitoring, the swing plate 2 is swung by the impact of the falling coal, and then drives the metal sheet 35 to swing through the pivot shaft 5. The metal sheet 35 will be sensed by the proximity switch 34, and the proximity switch 34 sends an intermittent signal to the control module 33. At this time, it is judged that the coal inlet 71 is unblocked.

[0091] When the coal inlet 71 is blocked, the swing plate 2 is blocked by the accumulated coal and no longer swings. At this time, either the metal sheet 35 leaves the sensing range of the proximity switch 34 and the proximity switch 34 continuously does not send a signal, or it cooperates with the proximity switch 34 correspondingly and the proximity switch 34 continuously sends a signal. Then the control module 33 judges that the coal inlet 71 is blocked, and the control module 33 controls the alarm 4 to give an alarm, timely reminding the staff to dredge the coal inlet 71, improving the reminder performance of the product.

[0092] In one of the embodiments, as Figures 11-12 shown, the coal inlet 71 is in the shape of a flared mouth with a wider upper part and a narrower lower part, which is convenient for receiving the coal falling from the belt conveyor.

[0093] According to requirements, the above technical solutions can be combined to achieve the best technical effects.

[0094] The above are only the principles and preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, based on the principle of the present utility model, several other variations can also be made, which should also be regarded as the protection scope of the present utility model.

Claims

1. A coal blockage monitoring device for installation at a coal dropping port, characterized in that, It includes a mounting bracket for mounting on the platform of the coal dropping port, a swing plate for extending into the coal dropping port, an electric control box for mounting on the platform, and an alarm for alarming; The mounting bracket is connected with a pivot shaft, the pivot shaft includes a main shaft section and a sub-shaft section connected to one end of the main shaft section, the main shaft section is pivotally connected with the mounting bracket, and the sub-shaft section is pivotally connected in the electric control box; The upper end of the swing plate is connected with the main shaft section, and the swing plate can rotate integrally with the pivot shaft; The electric control box is provided with a control module, a pair of proximity switches and multiple pairs of metal sheets. The two proximity switches are arranged on opposite sides of the sub-shaft section, and the multiple pairs of metal sheets are evenly arranged along the circumference of the sub-shaft section; The alarm and the proximity switches are respectively connected with the control module in signal; 2. The coal blockage monitoring device according to claim 1, wherein The proximity switch includes an opening for the metal sheet to pass through; 3. The coal blockage monitoring device according to claim 1, wherein, The box wall of the electric control box is provided with a ventilation opening; 4. The coal blockage monitoring device according to claim 1, characterized in that, The alarm is mounted on the box wall of the electric control box; 5. The coal blockage monitoring device according to any one of claims 1-4, characterized in that, The mounting bracket includes two side brackets arranged at intervals and a bracket top plate; The side bracket includes a side bracket bottom plate for connecting with the platform and a side bracket vertical plate connected with the side bracket bottom plate, and the bracket top plate is connected between the upper ends of the two side bracket vertical plates; The main shaft section is located below the bracket top plate and is pivotally connected with the two side bracket vertical plates; 6. The coal blockage monitoring device according to claim 5, characterized in that, The bottom of the electric control box is provided with a mounting groove, and the side bracket bottom plate close to the electric control box is inserted into the mounting groove; 7. The coal blockage monitoring device according to any one of claims 1-4, characterized in that, The swing plate is a rubber plate; 8. The coal blockage monitoring device according to any one of claims 1-4, characterized in that, A connecting sleeve is sleeved on the main shaft section, two clamping plates are connected to the bottom of the connecting sleeve, and multiple fasteners are connected between the two clamping plates; The upper end of the swing plate is provided with a swing plate through hole for the fastener to pass through; The upper end of the swing plate is connected between the two clamping plates, and the fastener passes through the swing plate through hole; 9. A coal chute structure, characterized in that, It includes a coal dropping cylinder and the coal blockage monitoring device according to any one of claims 1-8; The top of the coal dropping cylinder has a coal dropping port, and the edge of the coal dropping port is provided with the platform; The mounting bracket and the electric control box are respectively mounted on the platform, the swing plate extends downward into the coal dropping port and can swing in the coal dropping port; 10. The coal chute structure according to claim 9, characterized in that, The coal dropping port is in the shape of a flared port with a wider upper part and a narrower lower part.

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