Coal automatic screening device for mining production

Abstract

The present application relates to coal screening technical field, especially to a kind of coal automatic screening device for mining production.It includes: housing, the housing is provided with feed inlet and discharge port;Fixed frame, setting in the housing, the housing is provided with sieve frame, spring is fixedly connected between the sieve frame and the fixed frame, vibration motor is installed on the sieve frame, the housing is provided with guide frame;Hydraulic push rod, fixedly connected to the fixed frame;Movable frame, slidingly connected to the telescopic end of the hydraulic push rod;Rotary shaft, rotationally connected to the movable frame, the rotary shaft is fixedly connected with rotary shell, multiple sliding rings are slidingly connected in the rotary shell, and multiple prongs are fixedly connected to the sliding ring.The present application moves prong to stir coal seam on sieve frame, reduces the shielding of large coal to sieve frame, facilitates coal to pass through sieve frame, thereby speeds up the efficiency and screening accuracy of coal screening.

Description

Technical Field

[0001] This invention relates to the field of coal screening equipment technology, and in particular to an automatic coal screening device for mining production. Background Technology

[0002] Coal is a solid combustible mineral formed from ancient plants buried underground through complex biochemical and physicochemical processes. It is widely used in power generation, industrial smelting, and civil heating. Different applications have specific requirements for coal particle size, so after mining, it is necessary to screen it to achieve particle size classification. Existing screening devices mostly use multi-layer vibrating screens to achieve particle size separation through screens with different aperture sizes.

[0003] However, during coal screening, large pieces of coal, due to their greater mass, achieve a relatively smaller throwing height when the screen vibrates. This leads to their tendency to accumulate in certain areas along the direction of screen movement, causing the following problems:

[0004] 1. The formation of a dense material layer hinders the grading of lower-level materials;

[0005] 2. Subsequent feed may move along abnormal paths along the surface of the piled coal, causing abnormal mixing of materials of different particle sizes.

[0006] These combined issues can lead to decreased screening efficiency and reduced product purity, affecting the quality stability of coal of various specifications. Summary of the Invention

[0007] This invention provides an automatic coal screening device for mining production, which solves the problem that in existing screening devices, large pieces of coal are easily blocked on the screen surface, causing some small pieces of coal to move abnormally along the surface of the accumulated coal, thus affecting the screening accuracy.

[0008] The technical solution is as follows: An automatic coal screening device for mining production, comprising: a shell, wherein the shell is provided with an inlet and an outlet; a fixed frame, disposed within the shell, wherein a screening frame is disposed within the shell, the screening frame is provided with multiple screens, a spring is fixedly connected between the screening frame and the fixed frame, a vibrating motor is installed on the screening frame, a guide frame is disposed within the shell, the guide frame is used to guide the movement of materials of different sizes after screening; two hydraulic push rods, symmetrically distributed, both fixedly connected to the fixed frame; and a movable frame, having... Two, each slidably connected to the telescopic ends of adjacent hydraulic push rods, the screening frame and the fixed frame are both slidably connected to the movable frame; multiple rotating shafts, each rotatably connected between the two movable frames, each rotating shaft is fixedly connected to a rotating shell, and multiple sliding rings slidably connected to the rotating shaft are slidably connected inside the rotating shell, with multiple claws fixedly connected to the sliding rings; two sets of power components, both located on the screening frame, drive the claws to rotate via the rotating shafts, used to adjust the position distribution of coal blocks on the screening frame.

[0009] Furthermore, a gap is provided between the rotating shaft and the screen frame to allow relative movement between the screen frame and the rotating shaft.

[0010] Furthermore, multiple claws located in the same row are connected by multiple limiting ropes, and the two ends of the limiting ropes are fixedly connected to the claws at both ends of the same row.

[0011] Furthermore, the cross-section of the claw is L-shaped, and the limiting rope is located at the corner of the adjacent claw.

[0012] Furthermore, the length of the limiting rope is greater than the distance between the claws at both ends within the same row.

[0013] Furthermore, the power assembly includes: a support frame, the movable frame having a protrusion, slidably connected to the protrusion of the movable frame on the same side; racks, the same number as the rotating shafts, all fixedly connected to the support frame; gears fixedly connected to both ends of the rotating shafts, the gears meshing with adjacent racks; a sliding rod fixedly connected to the support frame, the sliding rod passing through the screening frame, and the sliding rod fixedly connected to the fixed frame.

[0014] Furthermore, the rotating shell is provided with multiple airbags, and the multiple airbags and multiple sliding rings on the same rotating shell are arranged at intervals. The rotating shell is provided with limiting grooves with the same number of claws as the rotating shell, and the claws slide within adjacent limiting grooves.

[0015] Furthermore, the width of the airbag is greater than the width of the limiting groove.

[0016] Furthermore, it also includes: a guide assembly disposed within the housing for limiting the height of the material on the screen frame; the guide assembly includes: a baffle fixedly connected to the top of the housing, the baffle being located above the screen frame, the baffle being used to limit the height of the material on the upper side of the screen frame; and guide rods spaced apart are fixedly connected to the side of the baffle near the screen frame.

[0017] Furthermore, the baffle is arc-shaped, and the distance between the middle of the baffle and the adjacent rotating shell is greater than the distance between the two sides of the baffle and the rotating shell. The distance between adjacent guide rods increases as their distance from the center line of the baffle increases, which is used to guide large clumps of material to move to both sides of the screen frame.

[0018] The beneficial effects are: 1. In the process of screening coal, the present invention moves the coal layer on the screen frame by driving the claw to move, which pushes the large coal in the coal layer to move, reduces the obstruction of the screen frame by the large coal, and facilitates the coal to pass through the screen frame, thereby speeding up the efficiency and accuracy of coal screening.

[0019] 2. In the process of coal screening, the present invention drives the claw to rotate the limiting rope, which in turn catches large coal pieces and brings them to the upper part of the coal layer, thereby further reducing the obstruction of the screen frame by the large coal pieces and thus further improving the screening efficiency of the device. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram of the fixing frame, screening frame, and vibrating motor of the present invention;

[0022] Figure 3 This is a three-dimensional structural diagram of the hydraulic push rod, the movable frame, and the support frame of the present invention;

[0023] Figure 4 This is a three-dimensional structural diagram of the hydraulic push rod, the moving frame, and the rack of the present invention;

[0024] Figure 5 This is a three-dimensional structural diagram of the support frame, rack, and sliding rod of the present invention;

[0025] Figure 6 This is a three-dimensional structural diagram of the rotating shaft, gear, and airbag of the present invention;

[0026] Figure 7 This is a three-dimensional structural diagram of the sliding ring, claw, and limiting groove of the present invention;

[0027] Figure 8 This is an exploded three-dimensional view of the movable frame, rotating shell, and support frame of the present invention.

[0028] Figure 9 This is a three-dimensional structural diagram of the baffle and guide rod of the present invention.

[0029] The markings in the attached diagram are: 1-shell, 2-fixed frame, 3-screening frame, 4-spring, 5-vibration motor, 6-guide frame, 7-hydraulic push rod, 8-moving frame, 9-rotating shaft, 10-rotating shell, 11-sliding ring, 12-claw, 13-limiting rope, 14-support frame, 15-rack, 16-gear, 17-sliding rod, 18-airbag, 101-limiting groove, 19-baffle, 20-guide rod. Detailed Implementation

[0030] The invention will now be described more fully below with reference to the accompanying drawings, in which presently preferred embodiments of the invention are illustrated. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness and to fully convey the scope of the invention to those skilled in the art.

[0031] An automatic coal screening device for mining production, such as Figures 1-8 As shown, it includes: a housing 1, which has an inlet and an outlet; a fixed frame 2, which is located inside the housing 1, and a screening frame 3 is installed inside the housing 1. The screening frame 3 has multiple screens, and a spring 4 is fixedly connected between the screening frame 3 and the fixed frame 2. A vibration motor 5 is installed on the screening frame 3. A guide frame 6 is installed inside the housing 1 to guide the movement of materials of different sizes after screening; two hydraulic push rods 7, which are symmetrically distributed and fixedly connected to the fixed frame 2; and two movable frames 8, which are slidably connected to each other. At the telescopic ends of adjacent hydraulic push rods 7, both the screen frame 3 and the fixed frame 2 are slidably connected to the movable frame 8; there are multiple rotating shafts 9, all rotatably connected between the two movable frames 8, and a rotating shell 10 is fixedly connected to the rotating shaft 9. Multiple sliding rings 11 are slidably connected to the rotating shaft 9 inside the rotating shell 10, and multiple claws 12 are fixedly connected to the sliding rings 11; there are two sets of power components, both of which are set on the screen frame 3, and drive the claws 12 to rotate through the rotating shaft 9, which is used to adjust the position distribution of coal blocks on the screen frame 3.

[0032] Furthermore, such as Figures 2-4 As shown, a gap is provided between the rotating shaft 9 and the screen frame 3 to allow relative movement between the screen frame 3 and the rotating shaft 9.

[0033] Furthermore, such as Figures 6-8 As shown, multiple claws 12 located in the same row are connected by multiple limiting ropes 13, and the two ends of the limiting ropes 13 are fixedly connected to the claws 12 at both ends of the same row.

[0034] Furthermore, such as Figures 6-8 As shown, the cross-section of the claw 12 is L-shaped, and the limiting rope 13 is located at the corner of the adjacent claw 12.

[0035] Furthermore, such as Figures 6-8 As shown, the length of the limiting rope 13 is greater than the distance between the two end claws 12 in the same row.

[0036] The above scheme provides a method for reducing the area of ​​large coal particles at the bottom of the coal seam from obstruction by the screens during coal screening. This is achieved by turning over the larger coal particles on the lower side (in the following description, coal that can pass through the three screens on the screening frame 3 is called small coal, and coal that cannot pass through the screens on the screening frame 3 is called large coal). The inlet and outlet of the shell 1 are located on its left and right sides, respectively. The right side of the screening frame 3 is located inside the outlet of the shell 1, and the outlet of the shell 1 is used to discharge coal that has not passed through the screening frame 3. The fixing frame 2 and the shell 1 are... The screen frame 3 is fixedly connected and equipped with three screens. The aperture of the three screens on the screen frame 3 gradually increases from left to right. The aperture of the screens can be adjusted according to actual conditions. The spring vibration motor 5 is used to drive the screen frame 3 to vibrate and screen the coal. The guide frame 6 is divided into three areas, corresponding to the three screens of the screen frame 3, and is used to guide and collect the coal after screening. In this embodiment, there are two hydraulic push rods 7 and two moving frames 8 to increase the stability of the moving frame 8 when it drives the rotating shaft 9 to move. The lower part of the moving frame 8 is provided with a sliding groove. The telescopic end of the hydraulic push rod 7 is slidably connected to the movable frame 8 via a vertical plate. The vertical plate on the telescopic end of the hydraulic push rod 7 is located in the slide groove of the movable frame 8, which is used to push the movable frame 8 to move when it slides relative to the fixed frame 2. Both the screen frame 3 and the fixed frame 2 are provided with symmetrically distributed through slots. The movable frame 8 slides in the adjacent through slots of the screen frame 3 and the fixed frame 2. In this embodiment, there are two rotating shafts 9. Initially, the two rotating shafts 9 are located at the junction of two adjacent screens on the screen frame 3. The number of sliding rings 11 on the rotating shell 10 can be adjusted according to the actual situation. In this embodiment, one Each sliding ring 11 has three claws 12, which are distributed circumferentially around the sliding ring 11. The claws 12 are used to move large coal pieces to the upper part of the coal layer, reducing the area of ​​large coal pieces blocking the screen holes. The power component is used to drive the rotating shaft 9 to rotate clockwise to screen the large coal pieces in the coal layer and move them to the upper part of the coal layer on the screen frame 3. The limiting rope 13 is an elastic rope that can be stretched within a small range. The limiting rope 13 is used to fix the large coal pieces at the bottom. When the sliding ring 11 drives the claws 12 to rotate, the multiple limiting ropes 13 work together to hold the large coal pieces in place.

[0037] Furthermore, such as Figures 3-5 and Figure 8As shown, the power assembly includes: a support frame 14, a movable frame 8 with a protrusion, and a sliding connection on the protrusion of the movable frame 8 on the same side; racks 15, the same number as the rotating shafts 9, all fixed to the support frame 14; gears 16 fixed to both ends of the rotating shafts 9, the gears 16 meshing with adjacent racks 15; a sliding rod 17 fixed to the support frame 14, the sliding rod 17 passing through the screen frame 3, and the sliding rod 17 fixed to the fixed frame 2.

[0038] In the above scheme, gear 16 is located on the right side of the adjacent rack 15. A one-way bearing is provided between gear 16 and rotating shaft 9 to drive rotating shaft 9 to rotate in one direction. When gear 16 moves to the left, it drives rotating shaft 9 to rotate clockwise. When gear 16 moves to the right, gear 16 does not drive rotating shaft 9 to rotate. During the process of vibrating motor 5 driving screen frame 3 to move up and down, screen frame 3 moves relative to fixed frame 2, causing sliding rod 17 to drive the parts on it to move relative to screen frame 3.

[0039] Furthermore, such as Figures 6-8 As shown, multiple airbags 18 are provided inside the rotating shell 10. Multiple airbags 18 and multiple sliding rings 11 on the same rotating shell 10 are arranged at intervals. The rotating shell 10 is provided with the same number of limiting grooves 101 as the claws 12 on it. The claws 12 slide in adjacent limiting grooves 101.

[0040] Furthermore, such as Figures 6-8 As shown, the width of the airbag 18 is greater than the width of the limiting groove 101.

[0041] The above solution provides a way to adjust the position of the claw 12 to avoid the coal when the claw 12 cannot push the coal to move; the air bag 18 is used to push the sliding ring 11 to reset, and the limiting groove 101 is used to make room for the claw 12 to move when it is squeezed. Initially, the claw 12 is located in the middle of the adjacent limiting groove 101.

[0042] Workflow: During coal production, when coal needs to be screened, the operator starts the vibrating motor 5. The vibrating motor 5 drives the screen frame 3 to vibrate, causing the screen frame 3 to move up and down relative to the fixed frame 2. During this process, when the screen frame 3 moves downward relative to the fixed frame 2, the spring 4 is compressed; when the screen frame 3 moves upward relative to the fixed frame 2, the spring 4 is extended. The operator uses a loader to feed coal through the feed inlet of the shell 1. Under the action of gravity, the coal is distributed along the screen frame 3, and under its own gravity, it moves along the screen... As the material rack 3 moves to the right, the screening rack 3 screens the coal. Coal particles smaller than the mesh size of the screen on the screening rack 3 fall through the screening rack 3 into the guide rack 6 and are discharged. Coal particles larger than the mesh size of the screen on the screening rack 3 continue to move to the right along the screening rack 3 and fall from other areas. Finally, the coal that cannot pass through the screening rack 3 is discharged from the outlet of the shell 1. The workers collect the screened coal at the outlet of the guide rack 6 and the shell 1. The following text refers to the movement direction of the left screen on the screening rack 3 and its nearby parts.

[0043] After the coal falls onto the screen frame 3, the operator activates the hydraulic push rod 7. The telescopic end of the hydraulic push rod 7 drives the moving frame 8 to move to the left. The moving frame 8 drives the rotating shaft 9 to move to the left. The rotating shaft 9 drives the rotating shell 10 and the gear 16 to move to the left. The rotating shell 10 drives the sliding ring 11 and its parts to move to the left. At this time, the gear 16 rotates clockwise under the action of the adjacent rack 15. Figure 2 (Viewed from front to back), gear 16 drives rotating housing 10 to rotate via rotating shaft 9. Rotating housing 10 drives sliding ring 11 and airbag 18 to rotate synchronously. Sliding ring 11 drives claw 12 to rotate clockwise, causing claw 12 to drive limiting rope 13 into the coal layer on screen frame 3, pushing large pieces of coal from bottom to left. During this process, coal particles smaller than the gap between two adjacent limiting ropes 13 pass through, while coal particles larger than the gap between two adjacent limiting ropes 13 are stuck and separated from screen frame 3 as claw 12 rotates, reducing the pressure on screen frame. The shielding area of ​​3 accelerates the screening of coal. As the claw 12 and the limiting rope 13 move the large coal, the large coal gradually moves out of the coal layer from the bottom of the coal layer on the screen frame 3. When the claw 12 is fixed to the sliding ring 11 at a horizontal position, some of the large coal separates from the limiting rope 13 under the action of gravity. The limiting rope 13 releases the fixation of the large coal. As the claw 12 continues to rotate, the large coal gradually separates from the limiting rope 13 and falls off. During this process, the large coal separated from the limiting rope 13 rolls and falls to the upper part of the coal layer on the screen frame 3 under the action of gravity.

[0044] During the process of screening large coal pieces using the aforementioned claw 12 and limiting rope 13, as the screen frame 3 moves downward and compresses the spring 4, the screen frame 3 moves downward relative to the sliding rod 17. The sliding rod 17 drives the moving frame 8 to move upward relative to the screen frame 3 via the support frame 14. This causes the moving frame 8 to drive the claw 12 and limiting rope 13 to move upward relative to the screen frame 3 via the rotating shaft 9. This causes the claw 12 and limiting rope 13 to flip the large coal pieces upward, increasing their flipping effect on the coal layer on the screen frame 3. This continues until the spring 4 is compressed to its limit. The spring 4 then pushes the screen frame 3 upward, and the support frame 14 and its parts move downward relative to the screen frame 3. After the screen frame 3 returns to its original position, the screen frame 3 repeats the above process and moves relative to the sliding rod 17.

[0045] During the process of adjusting the coal position by rotating the limiting rope 13 driven by the claw 12, when the claw 12 encounters coal that cannot be pushed, taking the case of the claw 12 being squeezed backward by the coal as an example, after the claw 12 comes into contact with the coal, the coal squeezes the claw 12 backward. The claw 12 drives the sliding ring 11 to move backward along the adjacent limiting groove 101. The sliding ring 11 moves and squeezes the adjacent air bag 18, increasing the distance between the two adjacent claws 12, thereby increasing the deformation length of the limiting rope 13. This facilitates the coal to pass through the gap between the adjacent limiting ropes 13, preventing the coal block from being unable to pass through the limiting rope 13 and being stuck here, blocking the screen frame 3 and affecting the efficiency of coal filtration. When the limiting rope 13 comes into contact with the coal, the coal squeezes the limiting rope 13 to deform it, increasing the gap between the adjacent limiting ropes 13. After the coal passes through the limiting rope 13 and the claw 12, the limiting rope 13 deforms and resets under its own elastic force. The air bag 18 pushes the sliding ring 11 to reset the claw 12.

[0046] When gear 16 moves to the left of rack 15, the telescopic end of hydraulic push rod 7 extends to its maximum distance, the moving frame 8 and its parts stop moving, and the rotating shaft 9 stops rotating. Then, the telescopic end of hydraulic push rod 7 retracts and drives the moving frame 8 to move to the right to reset. The moving frame 8 drives the rotating shaft 9 and its parts to move to reset. Gear 16 rotates in the opposite direction under the action of rack 15. At this time, the rotating shaft 9 and its parts do not rotate until the telescopic end of hydraulic push rod 7 is fully retracted. The moving frame 8 and its parts then stop moving and complete the reset. Afterward, hydraulic push rod 7 repeats the above process to drive the moving frame 8 to move back and forth to turn the coal until the required coal screening is completed. The operator then turns off vibrating motor 5 and hydraulic push rod 7. When coal screening is required again, the operator repeats the above process to screen the coal.

[0047] Furthermore, such as Figure 2 and Figure 9As shown, it also includes: a guide assembly, which is disposed inside the housing 1 and is used to limit the height of the material on the screen frame 3. The guide assembly includes: a baffle 19, which is fixed to the top inside the housing 1. The baffle 19 is located above the screen frame 3 and is used to limit the height of the material on the upper side of the screen frame 3. A guide rod 20 is fixedly connected to the side of the baffle 19 near the screen frame 3.

[0048] Furthermore, such as Figure 2 and Figure 9 As shown, the baffle 19 is arc-shaped. The distance between the middle of the baffle 19 and the adjacent rotating shell 10 is greater than the distance between the two sides of the baffle 19 and the rotating shell 10. The distance between adjacent guide rods 20 increases as the distance between them and the center line of the baffle 19 increases. This is used to guide the agglomerated large pieces of material to move to both sides of the screen frame 3.

[0049] The above solution provides a way to limit the height of coal on the screen frame 3 and reduce the resistance of the claw 12 in pushing the coal. The baffle 19 is used to limit the maximum height of coal on the upper side of the screen frame 3, so as to prevent the coal falling on the screen frame 3 from moving in a pile-up manner, causing subsequent coal to move along the surface of the piled coal on the screen frame 3 and not be able to make normal contact with the screen frame 3, resulting in poor coal screening effect. At the same time, it avoids the increase in resistance when the claw 12 pushes the piled coal, which affects the adjustment effect of the position of large coal pieces in the coal. The gap between the guide rods 20 is used to guide the large coal to the front and rear sides of the screen frame 3 by squeezing, adjusting the coal distribution position, so that the large coal pieces move to the thinner coal layer on both sides of the screen frame 3, thereby reducing the impact of large coal pieces on the claw 12 and the limiting rope 13 on the screening of large coal pieces.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic coal screening device for mining production, characterized in that, Including: The housing (1) is provided with an inlet and an outlet; A fixed frame (2) is set inside the housing (1). A screening frame (3) is set inside the housing (1). The screening frame (3) is equipped with multiple screens. A spring (4) is fixed between the screening frame (3) and the fixed frame (2). A vibration motor (5) is installed on the screening frame (3). A guide frame (6) is set inside the housing (1). Two hydraulic push rods (7) are respectively fixed to both sides of the fixed frame (2); The movable frame (8) has two parts, which are slidably connected to the telescopic ends of the adjacent hydraulic push rods (7). The screening frame (3) and the fixed frame (2) are both slidably connected to the movable frame (8). The rotating shaft (9) has multiple shafts, all of which are rotatably connected between the two movable frames (8). The rotating shaft (9) is fixedly connected to a rotating shell (10). Multiple sliding rings (11) that are slidably connected to the rotating shaft (9) are slidably connected inside the rotating shell (10). Multiple claws (12) are fixedly connected to the sliding rings (11). Two sets of power components are installed on the screen frame (3). The rotating shaft (9) drives the claw (12) to rotate, which is used to adjust the position distribution of coal blocks on the screen frame (3). Multiple claws (12) located in the same row are connected by multiple limiting ropes (13). The two ends of the limiting ropes (13) are fixed to the claws (12) at both ends of the same row. The limiting ropes (13) are elastic ropes. The power assembly includes: The support frame (14) has a protrusion on the movable frame (8) and is slidably connected to the protrusion on the same side of the movable frame (8); The number of racks (15) is the same as the number of rotating shafts (9), and they are all fixed to the support frame (14). Both ends of the rotating shaft (9) are fixed to gears (16), and the gears (16) mesh with the adjacent racks (15). The support frame (14) is fixed to a sliding rod (17), which passes through the screen frame (3) and is fixed to the fixed frame (2). The rotating shell (10) is provided with multiple airbags (18), and the multiple airbags (18) and multiple sliding rings (11) on the same rotating shell (10) are arranged at intervals. The rotating shell (10) is provided with the same number of limiting grooves (101) as the claws (12) on it, and the claws (12) slide in adjacent limiting grooves (101).

2. The automatic coal screening device for mining production according to claim 1, characterized in that, A gap is provided between the rotating shaft (9) and the screen frame (3) to allow relative movement between the screen frame (3) and the rotating shaft (9).

3. The automatic coal screening device for mining production according to claim 2, characterized in that, The cross-section of the claw (12) is L-shaped, and the limiting rope (13) is located at the corner of the adjacent claw (12).

4. The automatic coal screening device for mining production according to claim 3, characterized in that, The length of the limiting rope (13) is greater than the distance between the claws (12) at both ends in the same row.

5. The automatic coal screening device for mining production according to claim 4, characterized in that, The width of the airbag (18) is greater than the width of the limiting groove (101).

6. The automatic coal screening device for mining production according to claim 5, characterized in that, It also includes: A guiding assembly, disposed within the housing (1), is used to limit the height of the material on the screen frame (3). The guiding assembly includes: A baffle (19) is fixed to the top of the housing (1). The baffle (19) is located above the screen frame (3). The baffle (19) is used to limit the height of the material on the upper side of the screen frame (3). The baffle (19) is fixed with spaced guide rods (20) on the side near the screen frame (3).

7. The automatic coal screening device for mining production according to claim 6, characterized in that, The baffle (19) is arc-shaped. The distance between the middle of the baffle (19) and the adjacent rotating shell (10) is greater than the distance between the two sides of the baffle (19) and the rotating shell (10). The distance between the adjacent guide rods (20) increases as the distance between them and the center line of the baffle (19) increases. This is used to guide the agglomerated large pieces of material to move to both sides of the screen frame (3).

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