A screening device for coal processing

Abstract

The present invention discloses a screening device for coal processing, which relates to the technical field of coal processing equipment. It includes a bottom plate and a screening cylinder. There are several groups of screening holes in the central part of the screening cylinder. The bottom plate is in the shape of a "hui" character. It also includes: a rotation adjustment mechanism and a dispersion delay mechanism. The rotation adjustment mechanism includes: a support assembly, a driving member, and an inclination adjustment assembly. In the present invention, the inclination of the screening cylinder is adjusted by the provided inclination adjustment assembly, which is suitable for different screening situations. Moreover, during the rotation of the screening cylinder, the inclination adjustment assembly cooperates with the support assembly to make the screening cylinder vibrate, improving the screening effect. At the same time, the dispersion delay mechanism disperses the coal inside the screening cylinder and prolongs the residence time of the coal, ensuring thorough screening.

Description

Technical Field

[0001] The present invention relates to the technical field of coal processing equipment, and specifically relates to a screening device for coal processing. Background Art

[0002] Coal is a combustible black or brownish-black sedimentary rock, usually occurring in the rock strata or veins of coal beds or coal seams. Coal mainly consists of elements such as carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus. The sum of the first three elements accounts for more than 95% of the organic matter. It is a very important energy source, mainly used to generate electricity or heat through combustion; it is also an important raw material for the metallurgical and chemical industries, used for refining metals, or producing fertilizers and many chemical products.

[0003] During the coal processing process, it is necessary to screen coal and sieve coals of different sizes. In the prior art, most of the rotary drum screeners and vibrating screeners are used. However, the inclination of the rotary drum screener cannot be changed, and some small-diameter coals will get stuck in the screening holes, affecting the subsequent screening effect. Due to the large amount of material on the vibrating screener, its screening is not thorough. Therefore, there is an urgent need for a screening device for coal processing to solve the above problems. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a screening device for coal processing to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A screening device for coal processing includes a bottom plate and a screening cylinder. A number of groups of screening holes are provided in the central part of the screening cylinder. The bottom plate is in the shape of a "hui" character, and further includes:

[0007] A rotation adjustment mechanism, one end of which is connected to the bottom plate and the other end is in contact with the screening cylinder. Among them, the rotation adjustment mechanism includes: a support assembly. There are four groups of the support assemblies, and they are symmetrically arranged at both ends of the screening cylinder. The bottom ends of the two groups of support assemblies at one end of the screening cylinder are fixedly connected to the bottom plate, and the top ends are in contact with the screening cylinder. The bottom ends of the two groups of support assemblies at the other end of the screening cylinder are slidably connected to the bottom plate, and the top ends are in contact with the screening cylinder, which is used to support the screening cylinder; a driving member, connected to the bottom plate; an inclination adjustment assembly, connected to the output end of the driving member and in contact with the end of the screening cylinder, which is used to adjust the inclination of the screening cylinder;

[0008] A dispersion and delay mechanism, connected to the screening cylinder, which is used to disperse the coal inside the screening cylinder and extend the residence time of the coal.

[0009] As a further solution of the present invention: The support assembly includes:

[0010] Fixed rods, the fixed rods are provided with four groups and are symmetrically arranged at both ends of the screening cylinder, the bottoms of the two groups of fixed rods located at one end of the screening cylinder are fixedly connected to the bottom plate, and the bottoms of the two groups of fixed rods located at the other end of the screening cylinder are slidably connected to the bottom plate;

[0011] A sliding folding cylinder is slidably connected with the fixed rod;

[0012] The elastic member 1 is arranged inside the sliding folding cylinder, and the bottom end is connected to the top end of the fixed rod, and the top end is connected to the sliding folding cylinder;

[0013] The middle part of the fixed folding rod is rotatably connected with the top end of the sliding folding cylinder;

[0014] The limiting roller is rotatably connected to the fixed folding rod.

[0015] As a further solution of the present invention: the inclination adjustment component includes:

[0016] A limit slide bar connected to the output end of the driving member;

[0017] A threaded block is slidably connected with the limit sliding rod;

[0018] A threaded rod is rotatably connected to the driving member and is threadedly connected to the threaded block, and thread grooves in opposite directions are symmetrically arranged on the threaded rod;

[0019] A hinged rod, one end of which is hinged to the threaded block;

[0020] The abutting arc plate has one side hinged to the other end of the hinged rod and the other side abuts to the screening cylinder;

[0021] A limiting component, one end of which is connected to the threaded rod and the other end of which is connected to the limiting sliding rod, is used to limit the threaded rod.

[0022] As a further solution of the present invention: the limit assembly includes:

[0023] A sliding rod, slidably connected to the threaded rod;

[0024] The second elastic member is arranged inside the threaded rod, and one end of the elastic member is connected to the sliding rod, and the other end of the elastic member is connected to the threaded rod;

[0025] a gear connected to the sliding rod;

[0026] The gear ring is connected with the limiting slide rod and meshes with the gear.

[0027] As a further solution of the present invention: the dispersed delay mechanism comprises:

[0028] Connect the folding rod to the screening cylinder;

[0029] A folding cylinder, one end of which is connected to the connecting folding rod, and the folding cylinder is provided with a plurality of groups;

[0030] A sliding folding rod is slidably connected with the folding cylinder;

[0031] The elastic member 3 is arranged inside the folding cylinder, and one end of the elastic member is connected to the folding cylinder, and the other end of the elastic member is connected to one end of the sliding folding rod;

[0032] The dispersion arc plate is connected to the other end of the sliding folding rod and abuts against the inner wall of the screening cylinder.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The inclination of the screening drum is adjusted by the inclination adjusting component provided in the present invention, which is suitable for different screening situations. During the rotation of the screening drum, the inclination adjusting component cooperates with the supporting component to make the screening drum vibrate, thereby improving the screening effect. At the same time, the dispersion delay mechanism disperses the coal inside the screening drum and prolongs the residence time of the coal, thereby ensuring thorough screening. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of a screening device for coal processing in an embodiment of the present invention.

[0036] Figure 2 It is a partial structural schematic diagram of a screening device for coal processing in an embodiment of the present invention.

[0037] Figure 3 for Figure 2 sectional view of .

[0038] Figure 4 4 is a cross-sectional view of a support assembly in an embodiment of the present invention.

[0039] Figure 5 4 is a cross-sectional view of the inclination adjustment assembly in an embodiment of the present invention.

[0040] Figure 6 for Figure 5 A schematic diagram of the enlarged structure at point A in the middle.

[0041] Figure 7 It is a cross-sectional view of the dispersion delay mechanism in an embodiment of the present invention.

[0042] In the figure: 1. Bottom plate; 2. Shield; 3. Rotating adjustment mechanism; 31. Support assembly; 32. Driving member; 33. Inclination adjustment assembly; 311. Fixed rod; 312. Sliding folding cylinder; 313. First elastic member; 314. Fixed folding rod; 315. Limit rotating roller; 331. Limit sliding rod; 332. Threaded block; 333. Threaded rod; 334. Hinged rod; 335. Abutting arc plate; 336. Limit assembly; 3361. Sliding rod; 3362. Second elastic member; 3363. Gear; 3364. Tooth ring; 4. Screening cylinder; 5. Dispersion delay mechanism; 51. Connecting folding rod; 52. Folding cylinder; 53. Sliding folding rod; 54. Dispersion arc plate; 55. Third elastic member; 6. Limit ring. Detailed implementation mode

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0044] In the embodiments of the present invention, please refer to Figures 1 to 7 , a screening device for coal processing, including a bottom plate 1 and a screening cylinder 4. A number of groups of screening holes are provided in the central part of the screening cylinder 4. The bottom plate 1 is in the shape of a "return" character, and further includes:

[0045] A rotating adjustment mechanism 3, one end is connected to the bottom plate 1, and the other end abuts against the screening cylinder 4. Among them, the rotating adjustment mechanism 3 includes: a support assembly 31. Four groups of the support assemblies 31 are provided and symmetrically arranged at both ends of the screening cylinder 4. The bottom ends of the two groups of support assemblies 31 at one end of the screening cylinder 4 are fixedly connected to the bottom plate 1, and the top ends abut against the screening cylinder 4. The bottom ends of the two groups of support assemblies 31 at the other end of the screening cylinder 4 are slidably connected to the bottom plate 1, and the top ends abut against the screening cylinder 4, which is used to support the screening cylinder 4; a driving member 32, connected to the bottom plate 1; an inclination adjustment assembly 33, connected to the output end of the driving member 32 and abutting against the end of the screening cylinder 4, which is used to adjust the inclination of the screening cylinder 4;

[0046] A dispersion delay mechanism 5, connected to the screening cylinder 4, which is used to disperse the coal inside the screening cylinder 4 and extend the residence time of the coal.

[0047] The support assembly 31 supports the screening drum 4, the inclination adjustment assembly 33 adjusts the inclination of the screening drum 4, the conveying device (not shown) conveys the coal to the screening drum 4, the driving member 32 drives the inclination adjustment assembly 33 to rotate, and the inclination adjustment assembly 33 drives the screening drum 4 to rotate to screen the coal. At the same time, the inclination adjustment assembly 33 cooperates with the support assembly 31 to drive the screening drum 4 to reciprocate and shake, thereby improving the screening effect, and the dispersion delay mechanism 5 disperses the coal inside the screening drum 4 and prolongs the residence time of the coal to ensure the screening effect. The driving member 32 can be a stepping motor, a servo motor, etc.

[0048] As an embodiment of the present invention, please refer to Figures 1 to 4 , the support assembly 31 comprises:

[0049] Fixed rods 311, wherein four groups of the fixed rods 311 are symmetrically arranged at both ends of the screening drum 4, the bottoms of the two groups of the fixed rods 311 located at one end of the screening drum 4 are fixedly connected to the bottom plate 1, and the bottoms of the two groups of the fixed rods 311 located at the other end of the screening drum 4 are slidably connected to the bottom plate 1;

[0050] The sliding folding cylinder 312 is slidably connected to the fixing rod 311;

[0051] The elastic member 1 313 is disposed inside the sliding folding cylinder 312, and the bottom end is connected to the top end of the fixing rod 311, and the top end is connected to the sliding folding cylinder 312;

[0052] The middle part of the fixed folding rod 314 is rotatably connected to the top end of the sliding folding cylinder 312;

[0053] The limiting roller 315 is rotatably connected to the fixed folding rod 314 .

[0054] The screening drum 4 is located between eight groups of limit rollers 315, and the limit rollers 315 limit the screening drum 4. The inclination adjustment component 33 makes the screening drum 4 tilt. The fixed folding rod 314 and the sliding folding drum 312 are rotated so that the limit rollers 315 and the screening drum 4 are tilted synchronously. The fixed rod 311 on one side is slidably connected so that the four groups of limit rollers 315 on one side can move laterally to ensure the inclination of the screening drum 4. Under the action of the elastic member 1 313, the screening drum 4 is supported. When the driving member 32 drives the inclination adjustment component 33 to rotate, the setting of the elastic member 1 313 can also make the screening drum 4 shake, thereby improving the screening effect. The elastic member 1 313 can be a spring, a spring sheet, etc.

[0055] As an embodiment of the present invention, please refer to Figures 1 to 3 , Figure 5 and Figure 6 , the inclination adjustment component 33 comprises:

[0056] The limiting slide bar 331 is connected to the output end of the driving member 32;

[0057] The threaded block 332 is slidably connected to the limiting sliding rod 331;

[0058] The threaded rod 333 is rotatably connected to the driving member 32 and is threadedly connected to the threaded block 332. The threaded rod 333 is symmetrically provided with thread grooves in opposite directions.

[0059] A hinge rod 334, one end of which is hinged to the threaded block 332;

[0060] The abutting arc plate 335 has one side hinged to the other end of the hinge rod 334 and the other side abuts against the screening cylinder 4;

[0061] The limiting component 336 has one end connected to the threaded rod 333 and the other end connected to the limiting sliding rod 331 , and is used to limit the threaded rod 333 .

[0062] In the initial state, the limit assembly 336 limits the threaded rod 333. When the inclination of the screening drum 4 needs to be adjusted, the limit assembly 336 on the threaded rod 333 is released, and the threaded rod 333 is rotated. Under the limit of the limit slide rod 331, the threaded rod 333 drives the two groups of threaded blocks 332 to move, the threaded blocks 332 drive the hinged rod 334 to move, and the hinged rod 334 drives the abutment arc plate 335 to move, and the distance between the abutment arc plate 335 and the threaded rod 333 is adjusted. The abutment arc plate 335 makes the screening drum 4 tilt, and the inclination of the screening drum 4 is adjusted. After the adjustment is completed, the limit assembly 336 limits the threaded rod 333 again.

[0063] In this embodiment, an anti-skid pad can be provided on the side where the abutting arc plate 335 abuts against the screening drum 4. The screening drum 4 squeezes the anti-skid pad, causing the anti-skid pad to deform, thereby increasing the contact area and friction coefficient between the abutting arc plate 335 and the screening drum 4, thereby ensuring that the abutting arc plate 335 can drive the screening drum 4 to rotate.

[0064] As an embodiment of the present invention, please refer to Figures 1 to 3 , Figure 5 and Figure 6 , the limiting assembly 336 includes:

[0065] A sliding rod 3361 is slidably connected to the threaded rod 333;

[0066] The second elastic member 3362 is disposed inside the threaded rod 333 and has one end connected to the sliding rod 3361 and the other end connected to the threaded rod 333;

[0067] Gear 3363, connected to the sliding rod 3361;

[0068] The gear ring 3364 is connected to the limiting sliding rod 331 and meshes with the gear 3363 .

[0069] In the initial state, the gear 3363 is meshed with the toothed ring 3364 to limit the threaded rod 333. When the threaded rod 33 needs to be rotated, the sliding rod 3361 is pulled, and the elastic member 3362 is elastically deformed, and the sliding rod 3361 drives the gear 3363 to move, so that the gear 3363 is disengaged from the toothed ring 3364. The sliding rod 3361 is rotated, and the sliding rod 3361 drives the threaded rod 333 to rotate, and the height of the abutting arc plate 335 is adjusted, so as to adjust the inclination of the screening drum 4. After the adjustment is completed, the sliding rod 3361 is released, and the sliding rod 3361 moves in the opposite direction to the initial position under the reaction force of the elastic member 3362, and the gear 3363 is meshed with the toothed ring 3364 again to limit the threaded rod 333. The elastic member 3362 can be a spring, a spring, etc.

[0070] As an embodiment of the present invention, please refer to Figures 1 to 3 and Figure 7 , the dispersed delay mechanism 5 comprises:

[0071] Connecting folding rod 51, connected with screening cylinder 4;

[0072] A folding cylinder 52, one end of which is connected to the connecting folding rod 51, and the folding cylinder 52 is provided with a plurality of groups;

[0073] The sliding folding rod 53 is slidably connected to the folding cylinder 52;

[0074] The elastic member 3 55 is disposed inside the folding cylinder 52, and one end of the elastic member 55 is connected to the folding cylinder 52, and the other end of the elastic member 55 is connected to one end of the sliding folding rod 53;

[0075] The dispersion arc plate 54 is connected to the other end of the sliding folding rod 53 and abuts against the inner wall of the screening cylinder 4.

[0076] The coal moves in the inclined screening cylinder 4, and the coal hits the dispersion arc plate 54, causing the dispersion arc plate 54 to move, and the elastic member 3 55 undergoes elastic deformation, which reduces the movement rate of the coal and increases the residence time of the coal in the screening cylinder 4. At the same time, during the collision process, the coal with a small diameter falls through the screening hole, which reduces the overall weight. Under the reaction force of the elastic member 3 55, the coal moves in the opposite direction for a certain distance, and the coal is dispersed, further improving the screening effect. The vibration generated by the coal hitting the dispersion arc plate 54 will be transmitted to the screening cylinder 4, causing the screening cylinder 4 to vibrate slightly, ensuring that the coal particles can fall from the screening hole. The elastic member 3 55 can be a spring, a shrapnel, etc.

[0077] In this embodiment, the dispersion arc plates 54 are provided in several groups. The several groups of dispersion arc plates 54 located in the same plane are arranged circumferentially with equal intervals, and the dispersion arc plates 54 located in different planes are arranged at intervals to ensure that some dispersion arc plates 54 are always located at the bottom of the screening drum 4 to disperse and slow down the coal.

[0078] As an embodiment of the present invention, please refer to Figure 1 , also includes:

[0079] The shielding cover 2 is connected to the bottom plate 1 and is used for shielding the screening cylinder 4 where the screening holes are provided.

[0080] The screened fine coal is blocked by the shielding cover 2 to prevent the coal from being thrown away and ensure that the coal falls from the empty slot in the middle of the bottom plate 1.

[0081] As an embodiment of the present invention, please refer to Figure 1 , limit rings 6 are symmetrically provided at both ends of the screening cylinder 4.

[0082] The limiting ring 6 is provided to ensure that the screening drum 4 does not fall off during the rotating screening process and to limit its position.

[0083] The working principle of the present invention is as follows: the support assembly 31 supports the screening drum 4. In the initial state, the gear 3363 is meshed with the gear ring 3364 to limit the threaded rod 333. When the threaded rod 33 needs to be rotated, the sliding rod 3361 is pulled, and the elastic member 3362 is elastically deformed. The sliding rod 3361 drives the gear 3363 to move, so that the gear 3363 is disengaged from the gear ring 3364. The sliding rod 3361 is rotated, and the sliding rod 3361 drives the threaded rod 333 to rotate. Under the limit of the limiting sliding rod 331, the threaded rod 33 3 drives the two sets of threaded blocks 332 to move, the threaded blocks 332 drive the hinged rod 334 to move, the hinged rod 334 drives the abutting arc plate 335 to move, the distance between the abutting arc plate 335 and the threaded rod 333 is adjusted, the abutting arc plate 335 makes the screening drum 4 tilted, and the inclination of the screening drum 4 is adjusted. After the adjustment is completed, the sliding rod 3361 is released, and under the reaction force of the second elastic member 3362, the sliding rod 3361 moves in the opposite direction to the initial position, and the gear 3363 is meshed with the gear ring 3364 again to limit the threaded rod 333;

[0084] The driving member 32 drives the limiting slide bar 331 to rotate, and then drives the abutting arc plate 335 to rotate. The abutting arc plate 335 drives the screening drum 4 to rotate by friction force, and screens the coal. The small-diameter coal falls through the screening hole, and the large-diameter coal falls from the end of the screening drum 4, thereby achieving coal screening.

[0085] During the rotation of the screening drum 4 driven by the abutting arc plates 335, since there are intervals between the groups of abutting arc plates 335, when the abutting arc plates 335 are separated from the screening drum 4, the screening drum 4 moves downward under the pressure of the coal, and the bottom of the screening drum 4 is located between the two groups of abutting arc plates 335. With the support of the support assembly 31, the falling force is buffered, and at the same time, the screening drum 4 is prevented from falling too far. When the abutting arc plates 335 rotate to contact the screening drum 4 again, the abutting arc plates 335 hit the bottom of the screening drum 4, so that the screening drum 4 moves upward for a distance and abuts against the abutting arc plates 335 again. The impact force causes the screening drum 4 to vibrate, causing the small-diameter coal stuck in the screening hole to fall off. At the same time, the vibration causes the coal to shake, thereby improving the screening effect.

[0086] The coal moves in the inclined screening drum 4 and hits the dispersion arc plate 54, causing the dispersion arc plate 54 to move and the elastic member 55 to undergo elastic deformation, thereby reducing the movement rate of the coal and increasing the residence time of the coal in the screening drum 4. At the same time, during the impact process, the coal with a small diameter falls through the screening holes, thereby reducing the overall weight. Under the reaction force of the elastic member 55, the coal moves in the opposite direction for a certain distance, thereby dispersing the coal and further improving the screening effect. The coal hits the dispersion arc plate 54, and the vibration generated is transmitted to the screening drum 4, causing the screening drum 4 to vibrate slightly, thereby ensuring that the coal particles can fall from the screening holes.

[0087] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0088] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A screening device for coal processing, comprising a bottom plate and a screening cylinder. A number of groups of screening holes are provided at the central part of the screening cylinder. The bottom plate is in the shape of a "return" character, and is characterized in that, Also includes: A rotation adjustment mechanism, one end of which is connected to the bottom plate, and the other end of which is in contact with the screening drum, wherein the rotation adjustment mechanism comprises: a support assembly, wherein the support assembly is provided with four groups and is symmetrically arranged at both ends of the screening drum, wherein the bottom ends of the two groups of support assemblies located at one end of the screening drum are fixedly connected to the bottom plate, and the top ends are in contact with the screening drum, and the bottom ends of the two groups of support assemblies located at the other end of the screening drum are slidably connected to the bottom plate, and the top ends are in contact with the screening drum, for supporting the screening drum; a driving member connected to the bottom plate; an inclination adjustment assembly connected to the output end of the driving member and in contact with the end of the screening drum, for adjusting the inclination of the screening drum; The dispersion delay mechanism is connected to the screening cylinder and is used to disperse the coal inside the screening cylinder and extend the residence time of the coal; The inclination adjustment component comprises: A limit slide rod connected to the output end of the driving member; A threaded block is slidably connected with the limit sliding rod; A threaded rod is rotatably connected to the driving member and is threadedly connected to the threaded block, and thread grooves in opposite directions are symmetrically arranged on the threaded rod; A hinged rod, one end of which is hinged to the threaded block; The abutting arc plate has one side hinged to the other end of the hinged rod and the other side abuts to the screening cylinder; A limit assembly, one end of which is connected to the threaded rod and the other end of which is connected to the limit sliding rod, for limiting the threaded rod; The dispersed delay mechanism comprises: Connect the folding rod to the screening cylinder; A folding cylinder, one end of which is connected to the connecting folding rod, and the folding cylinder is provided with a plurality of groups; A sliding folding rod is slidably connected with the folding cylinder; The elastic member 3 is arranged inside the folding cylinder, and one end of the elastic member is connected to the folding cylinder, and the other end of the elastic member is connected to one end of the sliding folding rod; The dispersion arc plate is connected to the other end of the sliding folding rod and abuts against the inner wall of the screening cylinder.

2. A screening device for coal processing according to claim 1, characterized in that: The support assembly comprises: Fixed rods, the fixed rods are provided with four groups and are symmetrically arranged at both ends of the screening cylinder, the bottoms of the two groups of fixed rods located at one end of the screening cylinder are fixedly connected to the bottom plate, and the bottoms of the two groups of fixed rods located at the other end of the screening cylinder are slidably connected to the bottom plate; A sliding folding cylinder is slidably connected to the fixed rod; The elastic member 1 is arranged inside the sliding folding cylinder, and the bottom end is connected to the top end of the fixed rod, and the top end is connected to the sliding folding cylinder; The middle part of the fixed folding rod is rotatably connected with the top end of the sliding folding cylinder; The limiting roller is rotatably connected to the fixed folding rod.

3. A screening device for coal processing according to claim 1, characterized in that: The limiting component comprises: A sliding rod, slidably connected to the threaded rod; The second elastic member is arranged inside the threaded rod, and one end of the elastic member is connected to the sliding rod, and the other end of the elastic member is connected to the threaded rod; a gear connected to the sliding rod; The gear ring is connected with the limiting slide rod and meshes with the gear.

4. A screening device for coal processing according to claim 1, characterized in that: Also includes: The shielding cover is connected to the bottom plate and is used for shielding the screening cylinder where the screening holes are provided.

5. A screening device for coal processing according to claim 1, characterized in that: Limiting rings are symmetrically arranged at both ends of the screening cylinder.

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