A coal handling plant

By designing the coal storage bins, auger blades, and leveling mechanism of the coal loading and unloading equipment, the problems of uneven coal loading and coal dust pollution were solved, achieving uniform loading and a clean working environment, and improving loading and unloading efficiency and safety.

CN119551471BActive Publication Date: 2025-12-09华电江苏能源有限公司
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Patent Information

Application Number
CN202411840264.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-13
Publication Date
2025-12-09
Estimated Expiration
2044-12-13

AI Technical Summary

Technical Problem

In traditional coal loading processes, uneven coal distribution leads to inconsistent centers of gravity, affecting loading efficiency and posing safety hazards. It also generates a large amount of coal dust, polluting the working environment and endangering the health of workers.

Method used

Design a coal loading and unloading equipment, including a coal storage bin, auger blades, a leveling mechanism and a dust suppression mechanism. The auger blades stir the coal evenly, the leveling mechanism ensures uniform loading, and the dust suppression mechanism reduces coal dust by spraying water and suction, thus achieving mechanized operation.

Benefits of technology

It achieves uniform loading of coal, reduces the problem of inconsistent center of gravity, reduces coal dust, improves the working environment, increases loading and unloading efficiency and safety, and reduces the risk of occupational diseases.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a coal loading and unloading device, relates to the technical field of coal loading and unloading, and comprises a frame body, support frames are arranged between the outer side walls of the frame body, moving grooves are formed in the side walls of the support frames, a discharging mechanism for uniformly loading and unloading coal is arranged between the moving grooves, the discharging mechanism comprises coal storage barrels which move up and down along the moving grooves, dust falling mechanisms capable of reducing coal dust are arranged at the bottoms of the coal storage barrels, movable grooves are formed in the opposite side walls of the frame body, leveling mechanisms capable of leveling coal are movably arranged in the movable grooves, drive mechanisms for driving the coal storage barrels and the leveling mechanisms to move synchronously are arranged on the side walls of the frame body, and the coal storage barrels, the discharging mechanism, the dust falling mechanisms, the leveling mechanisms, the drive mechanisms and the frame body and the support structure are cooperatively used, so that the coal is uniformly loaded, the coal dust pollution is reduced, the loading efficiency and quality are improved, and the stability and safety of the device are ensured.
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Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal loading and unloading, in particular to a coal loading and unloading device. BACKGROUND

[0002] Coal, as an important fossil fuel, plays an irreplaceable role in energy supply and industrial development. In China, coal is divided into ten categories. Lean coal, coking coal, fat coal, gas coal, weakly coking coal, non-coking coal, long flame coal, etc. are collectively referred to as bituminous coal. Lean coal is referred to as semi-anthracite. Coal with a volatile matter of more than 40% is referred to as lignite.

[0003] The traditional coal loading process relies heavily on manual operation or basic mechanical equipment, making it difficult to ensure that the distribution of coal in each loading is highly uniform, which can lead to inconsistent center of gravity of the coal-loaded vehicles and unstable driving of the vehicles, affecting the overall efficiency of loading and causing potential safety hazards during transportation. In addition, a large amount of coal dust is generated during the coal loading and unloading process, which causes serious pollution to the working environment. The coal dust not only diffuses in the air, reducing the visibility of the working area, but also adheres to equipment, tools and personnel's clothing, making it difficult to completely remove. Long-term work in such an environment not only poses a threat to the respiratory system of workers, such as pneumoconiosis caused by inhaling coal dust, but also can cause discomfort and disease due to irritation of the eyes and skin by coal dust. SUMMARY

[0004] The present application aims to provide a coal loading and unloading device to solve the problem of uneven distribution of coal during the existing coal loading and unloading process, which generates a large amount of coal dust, affects the overall efficiency of loading and unloading, and causes serious pollution to the working environment.

[0005] A coal loading and unloading device, comprising a frame, a support frame is arranged between the outer side walls of the frame, a moving groove is formed on the two side walls of the support frame, a discharging mechanism for uniform loading and unloading of coal is arranged between the moving grooves, the discharging mechanism comprises a coal storage bucket that moves up and down along the moving groove, a dust reduction mechanism is arranged at the bottom of the coal storage bucket to reduce dust, a movable groove is formed in the opposite two side walls of the frame, a flattening mechanism is movably arranged in the movable groove to flatten the coal, and a drive mechanism is arranged on the side wall of the frame to drive the coal storage bucket and the flattening mechanism to move synchronously.

[0006] Preferably, both ends of the coal storage barrel are fixedly provided with moving rods corresponding to the moving grooves, the moving rods are movably arranged in the moving grooves, the top of the coal storage barrel is communicated with a feeding hopper, a main shaft is rotatably arranged in the coal storage barrel, a worm blade is arranged on the main shaft, a first motor is fixedly arranged on the outer side wall of the coal storage barrel, the output end of the first motor is in transmission connection with one end of the main shaft, and a plurality of discharge ports are formed in the bottom of the coal storage barrel.

[0007] Preferably, the dust falling mechanism comprises fixed plates fixedly arranged at both ends of the coal storage barrel, a dial is rotatably arranged on the side wall of the fixed plate close to the first motor, a first belt is arranged between the rotating shaft of the dial and the output shaft of the first motor, the side walls of the two mounting plates are each provided with a sliding rail, a sliding block is slidably arranged on the sliding rail, a water collecting plate is arranged between the two sliding blocks, a plurality of main water pipes are arranged on the water collecting plate, the main water pipes are arranged between the two discharge ports, a plurality of nozzles are communicated with the main water pipes, a driving rod is hingedly arranged on the dial, the other end of the driving rod is hingedly connected to the side wall of the sliding block, a water tank is arranged between the mounting plates, and a plurality of connecting pipes are communicated between the water tank and the water collecting plate.

[0008] Preferably, a wind pipe is rotatably arranged between the fixed plates, a groove wheel is fixedly arranged on the pipe body of the wind pipe, a cylindrical pin matched with the groove wheel is arranged on the dial, a plurality of air suction holes are formed in the wind pipe, and a fan is arranged on the side wall of the fixed plate and communicated with the wind pipe.

[0009] Preferably, the leveling mechanism comprises movable blocks movably arranged in the movable grooves, an activity frame is fixedly arranged between the side walls of the two movable blocks, two side plates symmetrically arranged along the central axis of the activity frame are arranged at the middle position of the top of the activity frame, an extension rod is fixedly arranged on the top of the side plate, two connecting rods are hingedly arranged at the output end of the extension rod, a connecting plate is hingedly arranged at the end of the connecting rod, a pressing plate is fixedly arranged at the bottom of the connecting plate, two movable rods are hingedly arranged on the activity frame along the central axis of the activity frame and connected with the connecting plate, a limiting groove is formed between the opposite side walls of the side plate, and a limiting block is movably arranged in the limiting groove and fixedly connected with the output end of the extension rod.

[0010] Preferably, the driving mechanism comprises a sliding groove formed in the top of the frame body, a first rack fixedly connected with the movable block is movably arranged in the sliding groove, a mounting bracket is fixedly arranged on the side wall of the frame body, a second motor is fixedly arranged on the side wall of the mounting bracket, a first gear fixedly arranged at the output end of the second motor, the first gear is in meshing connection with the first rack, a fixed bracket is fixedly arranged on the side wall of the frame body, a rotating shaft is rotatably arranged on the side wall of the fixed bracket, a second belt is arranged between the output shaft of the second motor and the rotating shaft, a second gear is fixedly arranged at the end of the rotating shaft, and a second rack in meshing connection with the second gear is fixedly arranged at the end of the coal storage barrel.

[0011] Preferably, the bottom of the frame is provided with a plurality of support columns, and a stable rod is arranged between the support columns and the frame; the inner part of the movable groove is provided with a plurality of rolling grooves, and the rolling grooves are provided with matching rolling balls; the rolling balls are in contact with the movable blocks.

[0012] The coal loading and unloading equipment has the advantages that: the uniform loading of coal is ensured through the multiple discharge openings arranged on the coal storage barrel and the stirring effect of the auger blades and the flattening effect of the flattening mechanism, the problem of inconsistent vehicle center of gravity is avoided, the flying of coal dust generated in the coal loading and unloading process is effectively reduced through the water spraying and air suction of the dust falling mechanism, the working environment is improved, the opportunities of manual direct contact with coal are reduced through the mechanized operation, the risk of diseases of workers due to coal dust pollution is reduced, and the safety of operation is improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 、 2 The drawings are structural schematic diagrams of different perspectives of the present application.

[0014] Figure 3 The drawings are structural schematic diagrams of different perspectives of the present application.

[0015] Figure 4 The drawings are structural schematic diagrams of different perspectives of the present application. Figure 1 .

[0016] Figure 5 The drawings are structural schematic diagrams of different perspectives of the present application. Figure 2 .

[0017] Figure 6 The drawings are structural schematic diagrams of different perspectives of the present application.

[0018] Wherein, 100, frame body; 101, support column; 102, stabilizing rod; 103, movable groove; 104, ball; 200, discharging mechanism; 201, support frame; 202, coal storage barrel; 203, moving groove; 204, moving rod; 205, first motor; 206, feed hopper; 207, main shaft; 208, auger blade; 209, discharge port; 300, flattening mechanism; 301, telescopic rod; 302, side plate; 303, movable frame; 304, movable block; 305, limiting groove; 306, limiting block; 307, connecting rod; 308, connecting plate; 309, movable rod; 310, pressing plate; 400, driving mechanism; 401, first rack; 402, mounting frame; 403, second motor; 404, first gear; 405, fixed frame; 406, second belt; 407, rotating shaft; 408, second gear; 409, second rack; 411, sliding groove; 500, dust falling mechanism; 501, first belt; 502, fixed plate; 503, air pipe; 504, air suction hole; 505, groove wheel; 506, cylindrical pin; 507, dial; 508, driving rod; 509, mounting plate; 510, water tank; 511, sliding rail; 512, sliding block; 513, water collecting plate; 514, connecting pipe; 515, main water pipe; 516, spray head; 517, fan. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the following further describes the present application in combination with specific embodiments.

[0020] As Figures 1 to 6 shown, a coal loading and unloading device includes a frame body 100, support frames 201 are arranged between the outer side walls of the frame body 100, moving grooves 203 are formed in the two side walls of the support frames 201, a discharging mechanism 200 for uniformly loading and unloading coal is arranged between the moving grooves 203, the discharging mechanism 200 includes coal storage barrels 202 that move up and down along the moving grooves 203, the coal storage barrels 202 are provided at the bottom with a dust falling mechanism 500 capable of reducing coal dust, the frame body 100 is provided with movable grooves 103 in the opposite side walls, the movable grooves 103 movably accommodate flattening mechanisms 300 capable of flattening coal, and the side walls of the frame body 100 are provided with a driving mechanism 400 for driving the coal storage barrels 202 and the flattening mechanisms 300 to move synchronously.

[0021] In the embodiment, the coal storage barrel 202 is fixedly provided with a moving rod 204 corresponding to the moving groove 203 at both ends, the moving rod 204 is movably arranged in the moving groove 203, the coal storage barrel 202 is communicated with a feeding hopper 206 at the top, the coal storage barrel 202 is rotatably arranged with a main shaft 207 inside, the main shaft 207 is provided with a screw blade 208 on the rod body, the first motor 205 is fixedly arranged on the outer side wall of the coal storage barrel 202, the output end of the first motor 205 is in transmission connection with one end of the main shaft 207, and a plurality of discharge ports 209 are formed in the bottom of the coal storage barrel 202.

[0022] The coal enters the coal storage barrel 202 through the feeding hopper 206, the first motor 205 is started, the main shaft 207 and the screw blade 208 are driven to rotate, the coal is uniformly stirred in the coal storage barrel 202, the discharge port 209 is opened, the coal uniformly falls, the uniform loading of the coal is realized, the problem of inconsistent gravity center is avoided, the loading efficiency is improved, and manual operation is reduced.

[0023] In the embodiment, the dust falling mechanism 500 includes a fixed plate 502 and a mounting plate 509 fixedly arranged at both ends of the coal storage barrel 202, a dial 507 is rotatably arranged on the side wall of the fixed plate 502 close to the first motor 205, a first belt 501 is arranged between the rotating shaft of the dial 507 and the output shaft of the first motor 205, the side walls of the two mounting plates 509 are each provided with a sliding rail 511, a sliding block 512 is slidably arranged on the sliding rail 511, a water collecting plate 513 is arranged between the two sliding blocks 512, a plurality of main water pipes 515 are arranged on the water collecting plate 513, the main water pipes 515 are arranged between the two discharge ports 209, a plurality of nozzles 516 are communicated with the main water pipes 515, a driving rod 508 is hingedly arranged on the dial 507, the other end of the driving rod 508 is hingedly connected to the side wall of the sliding block 512, a water tank 510 is arranged between the two mounting plates 509, a plurality of connecting pipes 514 are communicated between the water tank 510 and the water collecting plate 513, a wind pipe 503 is rotatably arranged between the fixed plates 502, a groove wheel 505 is fixedly arranged on the pipe body of the wind pipe 503, a cylindrical pin 506 is arranged on the dial 507 and matched with the groove wheel 505, a plurality of air suction holes 504 are formed in the wind pipe 503, and a fan 517 is arranged on the side wall of the fixed plate 502 and communicated with the wind pipe 503.

[0024] When the first motor 205 starts, the dial 507 is driven to rotate by the first belt 501, the dial 507 drives the sliding block 512 to slide on the slide rail 511 through the driving rod 508, and then drives the water collecting plate 513 and the spray head 516 to move horizontally along the slide rail 511, the water tank 510 supplies water for the water collecting plate 513 through the connecting pipe 514, the spray head 516 sprays water mist, reduces the flying of coal dust, at the same time, the grooved wheel 505 on the air pipe 503 cooperates with the cylindrical pin 506, generates suction through the fan 517, sucks the coal dust into the air pipe 503 and discharges, effectively reduces the coal dust generated in the process of loading and unloading coal, improves the working environment, reduces the health risk of workers, and reduces the occurrence of pneumoconiosis and other occupational diseases.

[0025] In the embodiment, the flattening mechanism 300 comprises movable blocks 304 movably arranged in the movable groove 103, movable racks 303 movably arranged between the side walls of the two movable blocks 304, two side plates 302 symmetrically arranged along the central axis of the movable racks 303, telescopic rods 301 fixedly arranged on the top of the side plates 302, two connecting plates 308 hingedly arranged at the ends of the connecting rods 307 hingedly arranged at the output ends of the telescopic rods 301, two limiting grooves 305 arranged between the opposite side walls of the side plates 302, limiting blocks 306 movably arranged in the limiting grooves 305, the output ends of the telescopic rods 301 being fixedly connected with the side walls of the limiting blocks 306, a sliding groove 411 arranged on the top of the frame body 100, a first rack 401 movably arranged in the sliding groove 411 and fixedly connected with the movable blocks 304, a mounting rack 402 fixedly arranged on the side wall of the frame body 100, a second motor 403 fixedly arranged on the side wall of the mounting rack 402, a first gear 404 fixedly arranged at the output end of the second motor 403, the first gear 404 being meshingly connected with the first rack 401, a fixed rack 405 fixedly arranged on the side wall of the frame body 100, a rotating shaft 407 rotatably arranged on the side wall of the fixed rack 405, a second belt 406 arranged between the output shaft of the second motor 403 and the rotating shaft 407, a second gear 408 fixedly arranged at the end of the rotating shaft 407, and a second rack 409 fixedly arranged at the end of the coal storage barrel 202 and meshingly connected with the second gear 408.

[0026] When the coal is unloaded, the second motor 403 is started to rotate the rotating shaft 407 through the second belt 406, and then drive the coal storage barrel 202 to move upward through the meshing of the second gear 408 and the second rack 409, and drive the movable block 304 and the movable frame 303 to move in the direction of the coal storage barrel 202 in the movable groove 103 through the meshing of the first gear 404 and the first rack 401, so as to realize the synchronous movement of the coal storage barrel 202 and the leveling mechanism 300, improve the loading efficiency, the structure is compact, the transmission is reliable, and the failure rate is reduced. When the leveling mechanism 300 reaches the appropriate position, the telescopic rod 301 is started to move the pressing plate 310 through the connecting rod 307 and the connecting plate 308, the pressing plate 310 flattens the falling coal, and the combination of the movable rod 309 and the limiting block 306 and the limiting groove 305 ensures the stability of the flattening process, ensures the flatness of the coal loading, improves the loading quality, reduces the loss and safety hidden danger of the coal in the transportation process.

[0027] In the embodiment, the frame body 100 is provided with a plurality of supporting columns 101 at the bottom, and a stabilizing rod 102 is arranged between the supporting column 101 and the frame body 100. A plurality of rolling grooves are arranged in the movable groove 103, and a plurality of matched rolling balls 104 are arranged in the rolling grooves. The rolling balls 104 are in contact with the movable block 304.

[0028] The frame body 100 is fixed on the coal loading device through the supporting column 101 and the stabilizing rod 102, so as to ensure the stability of the equipment. The rolling balls 104 in the movable groove 103 are in contact with the movable block 304, so as to reduce the friction resistance, improve the smoothness of movement, ensure the stability of the equipment and the smoothness of movement, prolong the service life of the equipment, and reduce the maintenance cost.

[0029] Working process and principle: when the device is used, the frame body 100 is fixed on the coal loading device through the supporting column 101 and the stabilizing rod 102, the coal enters the coal storage barrel 202 through the feeding hopper 206, the first motor 205 is started, the main shaft 207 and the auger blade 208 are driven to rotate, the coal in the coal storage barrel 202 is stirred uniformly, the discharge port 209 is opened, the coal falls uniformly, the uniform loading of the coal is realized, and the problem of inconsistent gravity center is avoided, when the first motor 205 is started, the dial plate 507 is driven to rotate through the first belt 501, the dial plate 507 drives the sliding block 512 to slide on the sliding rail 511 through the driving rod 508, and then drives the water collecting plate 513 and the spray head 516 to move horizontally along the sliding rail 511, the water tank 510 supplies water for the water collecting plate 513 through the connecting pipe 514, the spray head 516 sprays water mist, reduces the flying of coal dust, meanwhile, the grooved wheel 505 and the cylindrical pin 506 on the air pipe 503 cooperate, the suction force is generated through the fan 517, the coal dust is sucked into the air pipe 503 and discharged, the coal dust generated in the process of loading and unloading the coal is effectively reduced, and the working environment is improved, when the loading and unloading of the coal are completed, the second motor 403 is started, the rotating shaft 407 is driven to rotate through the second belt 406, and then the second gear 408 is engaged with the second rack 409, the coal storage barrel 202 is driven to move upwards, at the same time, the movable block 304 and the movable frame 303 are driven to move in the direction of the coal storage barrel 202 in the movable groove 103 through the engagement of the first gear 404 and the first rack 401, when the leveling mechanism 300 reaches the appropriate position, the telescopic rod 301 is started, the pressing plate 310 is driven to move through the connecting rod 307 and the connecting plate 308, the pressing plate 310 levels the falling coal, and the combination of the movable rod 309 and the limiting block 306 and the limiting groove 305 ensures the stability of the leveling process, and the flatness of the coal loading is ensured.

[0030] From the common general knowledge, the present application can be realized by other embodiments without departing from the spirit or essential characteristics thereof. Therefore, the above disclosed embodiments are merely illustrative in all aspects and are not the only ones. All changes within the scope of the present application or within the scope equivalent to the present application are included in the present application.

Claims

1. A coal loading and unloading device, characterized in that: The system includes a frame (100), a support frame (201) between the outer walls of the frame (100), a moving groove (203) on the two side walls of the support frame (201), a feeding mechanism (200) for uniformly loading and unloading coal between the moving grooves (203), the feeding mechanism (200) including a coal storage bucket (202) that moves up and down along the moving groove (203), a dust reduction mechanism (500) at the bottom of the coal storage bucket (202) to reduce coal dust, movable grooves (103) on opposite side walls of the frame (100), a leveling mechanism (300) that can spread coal is movable in the movable grooves (103), and a drive mechanism (400) on the side wall of the frame (100) for driving the coal storage bucket (202) and the leveling mechanism (300) to move synchronously. The leveling mechanism (300) includes a movable block (304) movably disposed within the movable groove (103); The drive mechanism (400) includes a slide groove (411) formed on the top of the frame (100), a first rack (401) fixedly connected to the movable block (304) is movably disposed in the slide groove (411), a mounting bracket (402) is fixedly disposed on the side wall of the frame (100), a second motor (403) is fixedly disposed on the side wall of the mounting bracket (402), and a first gear (404) is fixedly disposed at the output end of the second motor (403). The first gear (404) meshes with the first rack (401), a fixed frame (405) is fixedly provided on the side wall of the frame (100), a rotating shaft (407) is rotatably provided on the side wall of the fixed frame (405), a second belt (406) is provided between the rotating shaft (407) and the output shaft of the second motor (403), a second gear (408) is fixedly provided at the end of the rotating shaft (407), and a second rack (409) meshing with the second gear (408) is fixedly provided at the end of the coal storage bucket (202); After the coal loading and unloading is completed, the second motor (403) is started, and the rotating shaft (407) is driven to rotate through the second belt (406). Then, through the meshing of the second gear (408) and the second rack (409), the coal storage bucket (202) is driven to move upward. At the same time, through the meshing of the first gear (404) and the first rack (401), the leveling mechanism (300) is driven to move towards the coal storage bucket (202). When the leveling mechanism (300) reaches the appropriate position, it will level the falling coal.

2. The coal loading and unloading equipment according to claim 1, characterized in that: The coal storage bucket (202) has fixed moving rods (204) at both ends, which correspond one-to-one with the moving trough (203). The moving rods (204) are movably disposed in the moving trough (203). The top of the coal storage bucket (202) is connected to a feeding hopper (206). The coal storage bucket (202) has a rotating main shaft (207) inside. The shaft of the main shaft (207) is provided with auger blades (208). The outer wall of the coal storage bucket (202) is fixed with a first motor (205). The output end of the first motor (205) is connected to one end of the main shaft (207). The bottom of the coal storage bucket (202) has multiple discharge ports (209).

3. The coal loading and unloading equipment according to claim 2, characterized in that: The dust suppression mechanism (500) includes a fixed plate (502) and a mounting plate (509) fixedly disposed at both ends of the coal storage bucket (202). A dial (507) is rotatably mounted on the side wall of the fixed plate (502) near the first motor (205). A first belt (501) is provided between the rotating shaft of the dial (507) and the output shaft of the first motor (205). Slide rails (511) are provided on the side walls of both mounting plates (509). Slider blocks (512) are slidably mounted on the slide rails (511). A water collection point is provided between the two sliders (512). The water collection plate (513) is provided with multiple main water pipes (515), which are located between two discharge ports (209). Multiple nozzles (516) are connected to the main water pipes (515). A drive rod (508) is hinged to the dial (507). The other end of the drive rod (508) is hinged to the side wall of the slider (512). A water tank (510) is provided between the mounting plates (509). Multiple connecting pipes (514) are connected between the water tank (510) and the water collection plate (513).

4. A coal loading and unloading equipment according to claim 3, characterized in that: A duct (503) is rotatably mounted between the fixed plates (502). A grooved wheel (505) is fixedly mounted on the body of the duct (503). A cylindrical pin (506) adapted to the grooved wheel (505) is provided on the dial (507). A plurality of air suction holes (504) are opened on the duct (503). A fan (517) connected to the duct (503) is provided on the side wall of the fixed plate (502).

5. A coal loading and unloading equipment according to claim 2, characterized in that: The leveling mechanism (300) further includes a movable frame (303) fixedly disposed between the side walls of the two movable blocks (304). Two side plates (302) symmetrically arranged along their central axis are located at the middle of the top of the movable frame (303). A telescopic rod (301) is fixedly disposed on the top of each side plate (302). Two connecting rods (307) are hinged to the output end of each telescopic rod (301). A connecting plate (308) is hinged to the end of each connecting rod (307). A pressure plate (310) is fixedly provided at the bottom. Two movable rods (309) are symmetrically hinged along the central axis of the movable frame (303). The movable rods (309) are hinged to the connecting plate (308). A limiting groove (305) is opened between the opposite side walls of the side plate (302). A limiting block (306) is movably provided in the limiting groove (305). The side wall of the limiting block (306) is fixedly connected to the output end of the telescopic rod (301).

6. A coal loading and unloading device according to claim 1, characterized in that: The bottom of the frame (100) is provided with multiple support columns (101), and a stabilizing rod (102) is provided between the support columns (101) and the frame (100). The movable groove (103) is provided with multiple rolling grooves, and the rolling grooves are provided with matching balls (104). The balls (104) are in contact with the movable block (304).

Citation Information

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