A washing path changing system suitable for high moisture content raw coal

Abstract

The utility model relates to the technical field of coal mine machinery, specifically relates to a kind of washing path changing system suitable for high water content raw coal, including raw coal into warehouse belt, coal unloading device is installed in the upper middle part of raw coal into warehouse belt, the middle part of raw coal into warehouse belt is also set with the material distribution chute of cooperation use of coal unloading device, the outlet passage of material distribution chute is located above raw coal transfer belt, the discharge end of raw coal transfer belt is located above the first feed inlet of mixing chute, the outlet passage of mixing chute is located above raw coal washing belt, raw coal washing belt is arranged obliquely, high discharge end is connected with washing and selecting system;The discharge end of raw coal into warehouse belt is located above raw coal bin feed inlet, the discharge port of raw coal bin is located above warehouse lower transfer belt, the outlet end of warehouse lower transfer belt is located above the second feed inlet of mixing chute.The utility model passes through the coal unloading device of addition, the path of high water content raw coal into washing and selecting system is changed flexibly, avoids the occurrence of warehouse collapse accident.

Description

Technical Field

[0001] This utility model relates to the field of coal mining machinery technology, specifically to a system for changing the washing path of raw coal with high moisture content. Background Technology

[0002] During coal mining, the moisture content of raw coal varies significantly due to factors such as coal seam occurrence conditions, mining technology, and external environment, typically ranging from 5% to 15%. For open-pit coal, the moisture content often increases further due to factors such as atmospheric precipitation, surface water seepage, and dust suppression spraying during mining operations, and may even exceed 20%.

[0003] Currently, the conventional raw coal pretreatment process involves transporting mined raw coal directly to a raw coal silo via a belt conveyor for temporary storage before entering the washing and beneficiation system. However, when the moisture content of the raw coal is too high (>10%), direct storage in the raw coal silo can easily lead to safety accidents such as coal caking, arching, or even silo collapse after accumulating to a certain amount, seriously threatening the stable operation of the production system.

[0004] For the pretreatment of high-moisture-content raw coal (moisture content > 10%), existing technologies mainly adopt two methods: one is open-air storage and natural drying. Although this method can reduce the moisture content of the coal, it has problems such as large land area, long operation cycle, and easy secondary caking of coal, and it is easy to cause coal dust pollution during the drying process; the other is to use drying equipment for forced drying, but this process has high energy consumption, and the exhaust gas generated during the drying process contains dust and volatile pollutants, which poses environmental problems. Utility Model Content

[0005] To address the technical problems of existing high-moisture-content raw coal pretreatment methods, such as poor safety, low efficiency, and environmental pollution, this utility model provides a system for changing the entry path of high-moisture-content raw coal into the washing and beneficiation system. By adding a coal unloader, the path of high-moisture-content raw coal into the washing and beneficiation system can be flexibly changed, thus avoiding the occurrence of silo collapse accidents.

[0006] This utility model provides a system for changing the washing path of raw coal with high moisture content, including a raw coal inlet belt, a coal unloader installed above the middle of the raw coal inlet belt, a material distribution chute for use with the coal unloader in the middle of the raw coal inlet belt, the outlet channel of the material distribution chute being located above the raw coal transfer belt, the discharge end of the raw coal transfer belt being located above the first inlet of the mixing chute, the outlet channel of the mixing chute being located above the raw coal inlet belt, the raw coal inlet belt being inclined, and the high-level discharge end being connected to the washing system;

[0007] The discharge end of the raw coal inlet conveyor belt is located above the raw coal inlet, the discharge outlet of the raw coal silo is located above the under-silo transfer conveyor belt, and the outlet end of the under-silo transfer conveyor belt is located above the second inlet of the mixing chute.

[0008] The coal unloader includes a guide plate and a drive unit that is connected to the guide plate in a transmission. The guide plate is configured to have a first working state and a second working state under the driving action of the drive unit.

[0009] In the first working state, the lower surface of the guide plate is in contact with the raw coal inlet belt, and the width of the vertical projection of the guide plate is greater than the width of the raw coal inlet belt.

[0010] In the second working state, the lower surface of the guide plate is partially or completely separated from the raw coal inlet belt, and a space for material to pass through is formed between the lower surface of the guide plate and the upper surface of the raw coal inlet belt.

[0011] Furthermore, the raw coal inlet conveyor belt is arranged horizontally or inclined; when inclined, the feed end of the raw coal inlet conveyor belt is lower than the discharge end.

[0012] Furthermore, when the structure is tilted, the inclination angle of the conveyor belt for raw coal entering the warehouse is 5°-30°.

[0013] Furthermore, the guide plate of the unloader is a rectangular plate folded into a V-shape. Both ends of the guide plate are hinged to the two side frames of the raw coal inlet conveyor belt, with the pointed ends of the guide plate facing the feed end of the belt. A hinge seat is fixedly connected between the included angles of the guide plate. The drive unit of the unloader includes a support frame installed between the two side frames of the raw coal inlet conveyor belt. The support frame is located downstream of the guide plate. A hydraulic cylinder is hinged between the support frame and the hinge seat. The hinge point between the hydraulic cylinder and the support frame is higher than the hinge point between the guide plate and the frame. At this time, the piston rod end of the hydraulic cylinder is hinged to the hinge seat, and the cylinder body is hinged to the support frame. The extension and retraction of the piston rod within the hydraulic cylinder can drive the guide plate to rotate vertically around the hinge point between it and the frame, thereby adjusting the angle of the guide plate and changing its working state.

[0014] Furthermore, the guide plate of the coal unloader is a horizontally inclined rectangular plate. One corner of the lower part of the guide plate, away from the feed end of the raw coal feed belt, is hinged to the frame on either side of the raw coal feed belt. A hinge seat is fixedly connected to the side of the guide plate away from the feed end of the raw coal feed belt. The drive unit of the coal unloader includes a support frame installed between the two frames of the raw coal feed belt. The support frame is located downstream of the guide plate. A hydraulic cylinder is hinged between the support frame and the hinge seat. The hinge point between the hydraulic cylinder and the support frame is higher than the hinge point between the guide plate and the frame. At this time, the piston rod end of the hydraulic cylinder is hinged to the hinge seat, and the cylinder body of the hydraulic cylinder is hinged to the support frame. The extension and retraction of the piston rod in the hydraulic cylinder can drive the guide plate to rotate vertically around the hinge point between it and the frame, thereby adjusting the angle of the guide plate and changing its working state.

[0015] Furthermore, the raw coal transfer conveyor belt is set horizontally.

[0016] Furthermore, the outlet channel of the mixing chute is located above the low feed end of the raw coal washing conveyor belt.

[0017] Furthermore, the inclination angle of the raw coal washing conveyor belt is 30°-45°.

[0018] Furthermore, the inclination angle of the raw coal washing conveyor belt is 35°.

[0019] Furthermore, the conveyor belts for underground transfer are set horizontally.

[0020] The beneficial effects of this utility model are as follows:

[0021] This invention provides a system for changing the feed path of high-moisture-content raw coal. This system alters the path through which high-moisture-content raw coal enters the washing system. Instead of entering the raw coal silo via the feed conveyor belt and then falling onto the washing conveyor belt, the high-moisture-content raw coal avoids the risk of silo collapse that previously occurred when large quantities of high-moisture-content raw coal were only temporarily stored in the silo. Furthermore, the feed conveyor belt needs to transport the raw coal to the washing system at a relatively high angle, which is generally large. Direct transport of high-moisture-content raw coal via this belt would easily lead to slippage. This invention, however, mixes high-moisture-content and low-moisture-content raw coal in a mixing chute before pouring them together onto the feed conveyor belt for transport to the washing system. This adjusts the moisture content of the raw coal, reducing the risk of slippage on the steeply inclined feed conveyor belt. Attached Figure Description

[0022] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the washing path modification system of this utility model.

[0024] Figure 2 This is a top view schematic diagram of the coal unloader in Example 1.

[0025] Figure 3 This is a top view schematic diagram of the coal unloader in Example 2.

[0026] In the diagram, 1: raw coal inlet conveyor belt, 2: coal unloader, 2-1: guide plate, 2-2: support frame, 2-3: hydraulic cylinder; 2-4: hinged seat, 3: material distribution chute, 4: raw coal bin, 5: under-bin transfer conveyor belt, 6: raw coal transfer conveyor belt, 7: mixing chute, 8: raw coal washing conveyor belt. Detailed Implementation

[0027] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0028] Example 1

[0029] like Figure 1 , Figure 2As shown, a system for changing the washing path of raw coal with high moisture content includes a raw coal inlet belt 1, which is inclined with the feed end lower than the discharge end at an angle of 5°. A coal unloader 2 is installed above the middle of the raw coal inlet belt 1. The coal unloader 2 includes a guide plate 2-1 and a drive unit connected to the guide plate 2-1. The guide plate 2-1 is a rectangular plate folded into a V-shape, with both ends hinged to the two side frames of the raw coal inlet belt 1, with the pointed end facing the feed end. A hinge seat 2-4 is fixedly connected between the included angles. The drive unit of the coal unloader 2 includes a support frame 2-2 installed between the two side frames of the raw coal inlet belt 1. The support frame 2-2 is located downstream of the guide plate 2-1. A hydraulic cylinder 2-3 is hinged between the support frame 2-2 and the hinge seat 2-4. The hinge point between the hydraulic cylinder 2-3 and the support frame 2-2 is higher than the hinge point between the guide plate 2-1 and the frame. At this time, the piston rod end of hydraulic cylinder 2-3 is hinged to hinge seat 2-4, and the cylinder body of hydraulic cylinder 2-3 is hinged to support frame 2-2. The extension and retraction of the piston rod inside hydraulic cylinder 2-3 can drive guide plate 2-1 to rotate vertically around the hinge point between it and the frame, thereby adjusting the angle of guide plate 2-1 and changing its working state. Guide plate 2-1 is configured to have a first working state and a second working state under the driving action of the drive unit.

[0030] First working state: The lower surface of the guide plate 2-1 is in contact with the raw coal inlet belt 1, and the width of the vertical projection of the guide plate 2-1 is greater than the width of the raw coal inlet belt 1.

[0031] Second working state: The lower surface of the guide plate 2-1 is partially or completely separated from the raw coal inlet belt 1, and a space for material to pass through is formed between the lower surface of the guide plate 2-1 and the upper surface of the raw coal inlet belt 1.

[0032] A material distribution chute 3, used in conjunction with a coal unloader 2, is also installed in the middle of the raw coal feeding conveyor belt 1. The outlet channel of the material distribution chute 3 is located above the raw coal transfer conveyor belt 6, which is horizontally arranged, with its discharge end located above the first inlet of the mixing chute 7. The outlet channel of the mixing chute 7 is located above the low-level inlet of the raw coal washing conveyor belt 8, which is inclined at an angle of 35°, with its high-level outlet connected to the washing and beneficiation system.

[0033] The discharge end of the raw coal feeding belt 1 is located above the feed inlet of the raw coal silo 4, and the discharge outlet of the raw coal silo 4 is located above the transfer belt 5 under the silo. The transfer belt 5 under the silo is set horizontally, and its outlet end is located above the second feed inlet of the mixing chute 7.

[0034] The moisture content of raw coal varies depending on the mining area, resulting in different moisture contents in different batches of raw coal during transportation. In use, raw coal mined from the underground coal face or open-pit mine is fed to the feed end of the raw coal silo conveyor belt 1. During transport on the raw coal silo conveyor belt 1, or after the raw coal is mined, workers use experience to determine whether the moisture content of a particular batch of raw coal is suitable for direct delivery to the raw coal silo 4.

[0035] If the moisture content of a certain batch of raw coal is determined to be qualified (low moisture content raw coal), the pointed end of the V-shaped guide plate 2-1 is moved away from the raw coal inlet conveyor belt 1 (in the second working state). Then the low moisture content raw coal directly enters the raw coal silo 4 with the raw coal inlet conveyor belt 1 for storage and standby.

[0036] If it is determined that the moisture content of a certain batch of raw coal is too high (high moisture content raw coal), when the raw coal is transported to the middle position of the raw coal inlet conveyor belt 1, the piston rod of the hydraulic cylinder 2-3 extends, causing the sharp end of the V-shaped guide plate 2-1 to be pressed down onto the raw coal inlet conveyor belt 1, and the lower surface of the guide plate 2-1 contacts the raw coal inlet conveyor belt 1 (in the first working state). When the high moisture content raw coal is transported with the raw coal inlet conveyor belt 1 to the position of the guide plate 2-1, the high moisture content raw coal changes its transportation path and is guided by the V-shaped guide plate 2-1 to both sides of the raw coal inlet conveyor belt 1, and slides into the feed end of the raw coal transfer conveyor belt 6 through the two material distribution chutes 3 respectively (at this time, the width of the raw coal transfer conveyor belt 6 is greater than the width of the raw coal inlet conveyor belt 1, so that the outlet channels of the two material distribution chutes 3 can be located above the raw coal transfer conveyor belt 6), and then is transported with the raw coal transfer conveyor belt 6 to the first feed inlet of the mixing chute 7. At the same time, the discharge port of the raw coal bunker 4 is opened, and the low moisture content raw coal falls into the transfer belt 5 under the bunker. It is then transported by the transfer belt 5 to the second feed port of the mixing chute 7. The high moisture content raw coal and the low moisture content raw coal fall together through the mixing chute 7 to the low feed end of the raw coal washing belt 8, and are then transported by the raw coal washing belt 8 to the washing and beneficiation system at a higher position for subsequent washing and beneficiation operations.

[0037] Before the improvement, the path for both high-moisture-content and low-moisture-content raw coal to enter the washing system was always from the raw coal inlet conveyor belt 1 into the raw coal bin 4, and then from the raw coal bin 4 into the raw coal washing conveyor belt 8. This utility model's washing path modification system changes the path of high-moisture-content raw coal into the washing system, avoiding the risk of bin collapse caused by the temporary storage of large amounts of high-moisture-content raw coal in the raw coal bin 4. Due to its inherent characteristics, the washing system generally has a high feed inlet, so the inclination angle of the raw coal washing conveyor belt 8 is generally large, allowing the raw coal to be fed into the washing system's feed inlet through the high-level discharge end of the raw coal washing conveyor belt 8. If high-moisture-content raw coal is transported directly on the raw coal washing conveyor belt 8, it is very easy for it to slip and sludge on the raw coal washing conveyor belt 8. However, this utility model can adjust the moisture content of the raw coal by mixing high-moisture-content raw coal and low-moisture-content raw coal in the mixing chute 7 and then pouring them together into the raw coal washing conveyor belt 8 for transportation. This can reduce the risk of raw coal slipping and sludge on the raw coal washing conveyor belt 8 at a large angle.

[0038] Example 2

[0039] like Figure 1 , Figure 3 As shown, a system for changing the washing path of raw coal with high moisture content includes a raw coal inlet belt 1, which is arranged at an inclination, with the feed end of the raw coal inlet belt 1 lower than the discharge end, and the inclination angle is 5°. A coal unloader 2 is installed above the middle of the raw coal feeding belt 1. The coal unloader 2 includes a guide plate 2-1 and a drive unit that is connected to the guide plate 2-1. The guide plate 2-1 of the coal unloader 2 is a rectangular plate that is horizontally inclined. One corner of the lower part away from the feed end of the raw coal feeding belt 1 is hinged to the frame on any side of the raw coal feeding belt 1. A hinge seat 2-4 is fixedly connected to the side of the guide plate 2-1 away from the feed end of the raw coal feeding belt 1. The drive unit of the coal unloader 2 includes a support frame 2-2 installed between the frames on both sides of the raw coal feeding belt 1. The support frame 2-2 is located downstream of the guide plate 2-1. A hydraulic cylinder 2-3 is hinged between the support frame 2-2 and the hinge seat 2-4. The hinge point between the hydraulic cylinder 2-3 and the support frame 2-2 is higher than the hinge point between the guide plate 2-1 and the frame. At this time, the piston rod end of hydraulic cylinder 2-3 is hinged to hinge seat 2-4, and the cylinder body of hydraulic cylinder 2-3 is hinged to support frame 2-2. The extension and retraction of the piston rod inside hydraulic cylinder 2-3 can drive guide plate 2-1 to rotate vertically around the hinge point between it and the frame, thereby adjusting the angle of guide plate 2-1 and changing its working state. Guide plate 2-1 is configured to have a first working state and a second working state under the driving action of the drive unit.

[0040] First working state: The lower surface of the guide plate 2-1 is in contact with the raw coal inlet belt 1, and the width of the vertical projection of the guide plate 2-1 is greater than the width of the raw coal inlet belt 1.

[0041] Second working state: The lower surface of the guide plate 2-1 is partially or completely separated from the raw coal inlet belt 1, and a space for material to pass through is formed between the lower surface of the guide plate 2-1 and the upper surface of the raw coal inlet belt 1.

[0042] A material distribution chute 3, used in conjunction with a coal unloader 2, is also installed in the middle of the raw coal feeding conveyor belt 1. The outlet channel of the material distribution chute 3 is located above the raw coal transfer conveyor belt 6, which is horizontally arranged, with its discharge end located above the first inlet of the mixing chute 7. The outlet channel of the mixing chute 7 is located above the low-level inlet of the raw coal washing conveyor belt 8, which is inclined at an angle of 35°, with its high-level outlet connected to the washing and beneficiation system.

[0043] The discharge end of the raw coal feeding belt 1 is located above the feed inlet of the raw coal silo 4, and the discharge outlet of the raw coal silo 4 is located above the transfer belt 5 under the silo. The transfer belt 5 under the silo is set horizontally, and its outlet end is located above the second feed inlet of the mixing chute 7.

[0044] The moisture content of raw coal varies depending on the mining area, resulting in different moisture contents in different batches of raw coal during transportation. In use, raw coal mined from the underground coal face or open-pit mine is fed to the feed end of the raw coal silo conveyor belt 1. During transport on the raw coal silo conveyor belt 1, or after the raw coal is mined, workers use experience to determine whether the moisture content of a particular batch of raw coal is suitable for direct delivery to the raw coal silo 4.

[0045] If the moisture content of a certain batch of raw coal is determined to be qualified (low moisture content raw coal), the pointed end of the V-shaped guide plate 2-1 is moved away from the raw coal inlet conveyor belt 1 (in the second working state). Then the low moisture content raw coal directly enters the raw coal silo 4 with the raw coal inlet conveyor belt 1 for storage and standby.

[0046] If it is determined that the moisture content of a certain batch of raw coal is too high (high moisture content raw coal), when the raw coal is transported to the middle position of the raw coal inlet conveyor belt 1, the piston rod of the hydraulic cylinder 2-3 extends, and the lower surface of the guide plate 2-1 contacts the raw coal inlet conveyor belt 1 (in the first working state). When the high moisture content raw coal is transported with the raw coal inlet conveyor belt 1 to the position of the guide plate 2-1, the high moisture content raw coal changes its transportation path and is guided by the guide plate 2-1 to one side of the raw coal inlet conveyor belt 1, and slides into the feed end of the raw coal transfer conveyor belt 6 along with the distribution chute 3, and then is transported with the raw coal transfer conveyor belt 6 to the first feed inlet of the mixing chute 7. At the same time, the discharge port of the raw coal bunker 4 is opened, and the low moisture content raw coal falls into the transfer belt 5 under the bunker. It is then transported by the transfer belt 5 to the second feed port of the mixing chute 7. The high moisture content raw coal and the low moisture content raw coal fall together through the mixing chute 7 to the low feed end of the raw coal washing belt 8, and are then transported by the raw coal washing belt 8 to the washing and beneficiation system at a higher position for subsequent washing and beneficiation operations.

[0047] Before the improvement, the path for both high-moisture-content and low-moisture-content raw coal to enter the washing system was always from the raw coal inlet conveyor belt 1 into the raw coal bin 4, and then from the raw coal bin 4 into the raw coal washing conveyor belt 8. This utility model's washing path modification system changes the path of high-moisture-content raw coal into the washing system, avoiding the risk of bin collapse caused by the temporary storage of large amounts of high-moisture-content raw coal in the raw coal bin 4. Due to its inherent characteristics, the washing system generally has a high feed inlet, so the inclination angle of the raw coal washing conveyor belt 8 is generally large, allowing the raw coal to be fed into the washing system's feed inlet through the high-level discharge end of the raw coal washing conveyor belt 8. If high-moisture-content raw coal is transported directly on the raw coal washing conveyor belt 8, it is very easy for it to slip and sludge on the raw coal washing conveyor belt 8. However, this utility model can adjust the moisture content of the raw coal by mixing high-moisture-content raw coal and low-moisture-content raw coal in the mixing chute 7 and then pouring them together into the raw coal washing conveyor belt 8 for transportation. This can reduce the risk of raw coal slipping and sludge on the raw coal washing conveyor belt 8 at a large angle.

[0048] Example 3

[0049] A system for changing the washing path of raw coal with high moisture content includes a raw coal inlet conveyor belt 1, which is horizontally arranged. A coal unloader 2 is installed above the middle of the raw coal inlet conveyor belt 1. Figure 2 As shown, the unloader 2 includes a guide plate 2-1 and a drive unit that is connected to the guide plate 2-1. The guide plate 2-1 of the unloader 2 is a rectangular plate folded into a V shape. Both ends are hinged to the two side frames of the raw coal inlet belt 1, with the pointed end facing the feed end. The included angle is fixedly connected to the hinge seat 2-4. The drive unit of the unloader 2 includes a support frame 2-2 installed between the two side frames of the raw coal inlet belt 1. The support frame 2-2 is located downstream of the guide plate 2-1. A hydraulic cylinder 2-3 is hinged between the support frame 2-2 and the hinge seat 2-4. The hinge point between the hydraulic cylinder 2-3 and the support frame 2-2 is higher than the hinge point between the guide plate 2-1 and the frame. At this time, the piston rod end of hydraulic cylinder 2-3 is hinged to hinge seat 2-4, and the cylinder body of hydraulic cylinder 2-3 is hinged to support frame 2-2. The extension and retraction of the piston rod inside hydraulic cylinder 2-3 can drive guide plate 2-1 to rotate vertically around the hinge point between it and the frame, thereby adjusting the angle of guide plate 2-1 and changing its working state. Guide plate 2-1 is configured to have a first working state and a second working state under the driving action of the drive unit.

[0050] First working state: The lower surface of the guide plate 2-1 is in contact with the raw coal inlet belt 1, and the width of the vertical projection of the guide plate 2-1 is greater than the width of the raw coal inlet belt 1.

[0051] Second working state: The lower surface of the guide plate 2-1 is partially or completely separated from the raw coal inlet belt 1, and a space for material to pass through is formed between the lower surface of the guide plate 2-1 and the upper surface of the raw coal inlet belt 1.

[0052] A material distribution chute 3, used in conjunction with a coal unloader 2, is also installed in the middle of the raw coal feeding conveyor belt 1. The outlet channel of the material distribution chute 3 is located above the raw coal transfer conveyor belt 6, which is horizontally arranged, with its discharge end located above the first inlet of the mixing chute 7. The outlet channel of the mixing chute 7 is located above the low-level inlet end of the raw coal washing conveyor belt 8, which is inclined at an angle of 35°, with its high-level outlet end connected to the washing and beneficiation system.

[0053] The discharge end of the raw coal feeding belt 1 is located above the feed inlet of the raw coal silo 4, and the discharge outlet of the raw coal silo 4 is located above the transfer belt 5 under the silo. The transfer belt 5 under the silo is set horizontally, and its outlet end is located above the second feed inlet of the mixing chute 7.

[0054] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A system for changing the washing path of raw coal with high moisture content, comprising a raw coal conveyor belt (1), characterized in that, A coal unloader (2) is installed above the middle of the raw coal feeding belt (1). A material distribution chute (3) is also set in the middle of the raw coal feeding belt (1) to cooperate with the coal unloader (2). The outlet channel of the material distribution chute (3) is located above the raw coal transfer belt (6). The discharge end of the raw coal transfer belt (6) is located above the first feed inlet of the mixing chute (7). The outlet channel of the mixing chute (7) is located above the raw coal washing belt (8). The raw coal washing belt (8) is arranged at an angle, and the high-level discharge end is connected to the washing and beneficiation system. The discharge end of the raw coal feeding belt (1) is located above the feed inlet of the raw coal silo (4), the discharge port of the raw coal silo (4) is located above the transfer belt (5) under the silo, and the outlet end of the transfer belt (5) under the silo is located above the second feed inlet of the mixing chute (7). The coal unloader (2) includes a guide plate (2-1) and a drive unit that is connected to the guide plate (2-1) in a transmission manner. The guide plate (2-1) is configured to have a first working state and a second working state under the driving action of the drive unit. In the first working state, the lower surface of the guide plate (2-1) is in contact with the raw coal inlet belt (1), and the width of the vertical projection of the guide plate (2-1) is greater than the width of the raw coal inlet belt (1). In the second working state, the lower surface of the guide plate (2-1) is partially or completely separated from the raw coal inlet belt (1), and a space for material to pass through is formed between the lower surface of the guide plate (2-1) and the upper surface of the raw coal inlet belt (1).

2. The system for changing the washing path of raw coal with high moisture content as described in claim 1, characterized in that, The raw coal inlet conveyor belt (1) is arranged horizontally or inclined; when it is inclined, the feed end of the raw coal inlet conveyor belt (1) is lower than the discharge end.

3. The system for changing the washing path of raw coal with high moisture content as described in claim 2, characterized in that, When the conveyor belt (1) for raw coal is inclined, the inclination angle is 5°-30°.

4. The system for changing the washing path of raw coal with high moisture content as described in claim 1, characterized in that, The guide plate (2-1) of the unloader (2) is a rectangular plate folded into a V shape. The two ends of the guide plate (2-1) are respectively hinged to the two side frames of the raw coal inlet belt (1). The pointed end of the guide plate (2-1) faces the feed end of the raw coal inlet belt (1). The included angle of the guide plate (2-1) is fixedly connected to the hinge seat (2-4). The drive unit of the unloader includes a support frame (2-2) installed between the two side frames of the raw coal inlet belt. The support frame (2-2) is located downstream of the guide plate (2-1). A hydraulic cylinder (2-3) is hinged between the support frame (2-2) and the hinge seat (2-4). The hinge point between the hydraulic cylinder (2-3) and the support frame (2-2) is higher than the hinge point between the guide plate (2-1) and the frame.

5. A system for changing the washing path of raw coal with high moisture content as described in claim 1, characterized in that, The guide plate (2-1) of the unloader (2) is a rectangular plate with a horizontal inclination. The lower part of the guide plate (2-1) away from the feed end of the raw coal feed belt (1) is hinged to the frame on any side of the raw coal feed belt (1). The side of the guide plate (2-1) away from the feed end of the raw coal feed belt (1) is fixedly connected to the hinge seat (2-4). The drive unit of the unloader (2) includes a support frame (2-2) installed between the two frames of the raw coal feed belt (1). The support frame (2-2) is located downstream of the guide plate (2-1). A hydraulic cylinder (2-3) is hinged between the support frame (2-2) and the hinge seat (2-4). The hinge point between the hydraulic cylinder (2-3) and the support frame (2-2) is higher than the hinge point between the guide plate (2-1) and the frame.

6. The system for changing the washing path of raw coal with high moisture content as described in claim 1, characterized in that, The raw coal transfer conveyor belt (6) is set horizontally.

7. The system for changing the washing path of raw coal with high moisture content as described in claim 1, characterized in that, The outlet channel of the mixing chute (7) is located above the low feed end of the raw coal washing belt (8).

8. A system for changing the washing path of raw coal with high moisture content as described in claim 1 or 7, characterized in that, The inclination angle of the raw coal washing conveyor belt (8) is 30°-45°.

9. A system for changing the washing path of raw coal with high moisture content as described in claim 8, characterized in that, The inclination angle of the raw coal washing conveyor belt (8) is 35°.

10. A system for changing the washing path of raw coal with high moisture content as described in claim 1, characterized in that, The under-warehouse transfer belt (5) is set horizontally.

Images