Coal screening equipment and screening method for scraper transfer machine

Abstract

The present invention discloses a coal screening device and screening method for a scraper transfer machine, which relates to the field of coal screening technology and solves the technical problem that the existing coal screening equipment is difficult to fully contact the filter holes during the process of pushing the coal to move, thereby affecting the screening effect; it includes a frame with a drive assembly, a shell with a screen hole on the top is installed between the two frames, a chain plate driven by the drive assembly is fitted on the outer surface of the shell, a conveyor belt is installed on the inside of the shell, and a clearing mechanism for cleaning the screen holes is provided on the conveyor belt, and a swing mechanism for moving the coal is installed between the chain plate and the frame; the swing mechanism includes a shifting member, an inverted U-shaped plate, a transmission mechanism and a linkage mechanism, and the inverted U-shaped plate is slidably sleeved on the top of the chain plate. The present invention allows the chain plate to be reciprocated in the process of pushing the coal to move, thereby facilitating the coal to fully contact the screen holes, which is not only conducive to improving the screening effect, but also conveniently improving the screening efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of coal screening, and in particular to a coal screening device and a screening method for a scraper transfer machine. Background Art

[0002] Scraper transfer machine is a device used to transport mined coal. In the current process, after the coal is transported by the scraper transfer machine, it needs to be transferred to screening equipment multiple times by transport vehicles for centralized processing. Due to the huge amount of coal mined, the transportation frequency and transportation costs increase.

[0003] The Chinese patent publication number CN117772585B discloses a coal screening device for a scraper transfer machine. The transmission unit can drive the coal on the filter unit to move, and the filter unit can filter the moving coal. A dredging rod is provided on the chain plate, and a lower pressure frame is provided on the filter holes of the filter plate. When the chain plate moves to the corresponding position of the lower pressure frame, the lower pressure frame can cooperate with the trapezoidal block at the upper end of the dredging rod to drive the dredging rod to move downward, thereby causing the dredging rod to dredge the filter holes of the filter plate, thereby preventing the coal from clogging the filter holes of the filter plate. However, this technical solution still has the following defects:

[0004] Since there is a distance between adjacent filter holes, and the transmission unit only drives the coal to move along the length direction of the filter unit, the coal moving along the area between the filter holes cannot be screened, making it difficult for the coal to fully contact the filter holes, thus affecting the screening effect. Summary of the Invention

[0005] The purpose of the present invention is to provide a coal screening device and screening method for a scraper loader, which solves the problem that the existing coal screening equipment is difficult to make the coal fully contact with the filter holes during the process of pushing the coal to move, thereby affecting the screening effect.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A first aspect of the present invention provides a coal screening device for a scraper loader, comprising a frame with a drive assembly, a housing with a screen hole on the top mounted between the two frames, a chain plate driven by the drive assembly being attached to the outer surface of the housing, a conveyor belt mounted inside the housing, and a clearing mechanism for clearing the screen hole being provided on the conveyor belt, and a swinging mechanism for moving coal being mounted between the chain plate and the frame;

[0008] The swing mechanism includes a toggle member, an inverted U-shaped plate, a transmission mechanism and a linkage mechanism. The inverted U-shaped plate is slidably sleeved on the top of the chain plate. The inverted U-shaped plate is connected to the frame through the linkage mechanism. Several toggle members are installed in the chain plate, and the toggle members are connected to the inverted U-shaped plate through the transmission mechanism.

[0009] As a further solution of the present invention: the frame includes a side panel with a groove, a convex plate, a support frame and a strip plate, the support frame is installed on the side of the side panel away from the convex plate, the strip plate is installed on the top of the side panel, the groove is opened on the side of the side panel close to the shell, the convex plate is installed in the groove, and the side panel is connected to the outer side wall of the shell through the convex plate.

[0010] As a further solution of the present invention: the driving assembly includes a sprocket, a chain and a roller, the two rollers are located in the inner cavity near the two ends of the shell, and the two ends of the roller pass through the side wall of the shell and are coaxially connected to the sprocket, the conveyor belt and the two rollers are jointly sleeved, the sprocket is rotatably set in the groove, the two sprockets in the groove are connected by a chain, and the chain plate is installed between the two chains.

[0011] As a further solution of the present invention: the linkage mechanism includes a rack, a first gear, a rotating shaft, a reciprocating screw, a bearing seat and a protrusion, the protrusion is installed at the top center of the inverted U-shaped plate, the two bearing seats are installed at the top of the chain plate near the two ends, the rotating shaft passes through the bearing seat and is rotatably connected to it, the reciprocating screw is coaxially installed between the two rotating shafts, the protrusion is threadedly connected to the reciprocating screw, the two racks are respectively installed on opposite sides of the two strip plates, the first gear is connected to the end of the rotating shaft, and the first gear is meshed with the rack.

[0012] As a further solution of the present invention: the toggle member includes a rotating rod, a paddle and a rotating pin, the bottom of the chain plate is provided with an annular groove with open structures on both sides, the rotating rod is rotatably connected to the annular groove, the two paddles are symmetrically arranged on the rod wall of the rotating rod, and the rotating pin is coaxially installed on the top of the rotating rod.

[0013] As a further solution of the present invention: the transmission mechanism includes a through slot, a tooth block and a second gear, the through slot is arranged through the chain plate and distributed along its length direction, the top end of the turn pin extends into the through slot, the second gear is fixedly sleeved on the top end of the turn pin, the tooth block is installed on the inner side wall of the inverted U-shaped plate and is slidably connected to the through slot, two adjacent tooth blocks are staggered, and the gear is meshed with the corresponding second gear.

[0014] As a further solution of the present invention: the blockage clearing mechanism includes an adsorption plate, a partition and a negative pressure component. The adsorption plate is a hollow structure with an open top. The adsorption plate is installed on the top of the conveyor belt, and the adsorption plate is located directly below one of the chain plates. Several partitions are evenly installed between the inner walls of the adsorption plates. The negative pressure component is installed on the top of the conveyor belt and is connected to the inner cavity of the adsorption plate.

[0015] As a further solution of the present invention: the negative pressure component includes a negative pressure pump, a main adsorption tube and a branch pipe with a one-way valve, the partition divides the inner cavity of the adsorption plate into several negative pressure chambers corresponding to the sieve holes, the branch pipe is connected to the negative pressure chamber, and multiple branch pipes are connected to the main adsorption tube, and the input end of the negative pressure pump is connected to the main adsorption tube.

[0016] As a further solution of the present invention: the width of the conveyor belt is equal to the width of the inner cavity of the shell, and a material drop chute is opened through the bottom of the shell.

[0017] A second aspect of the present invention provides a method for screening coal for a scraper transfer machine, which is applied to the above-mentioned coal screening equipment for a scraper transfer machine, and comprises the following steps:

[0018] Step 1: Start the drive assembly to drive several chain plates to circulate along the outer surface of the shell. The running chain plates continuously push the coal to slide along the top of the shell, and the mesh can be used to screen the moving coal.

[0019] Step 2: During the operation of the chain plate, the swing mechanism is used to reciprocate the coal on the top of the shell, so that the coal can fully contact the screen holes and be fully screened. During the screening process, the coal that falls through the screen holes is discharged and collected by the conveyor belt inside the shell, and the coal that is not screened slides down and is collected from the end of the shell;

[0020] Step 3: During the operation of the conveyor belt, the clearing mechanism is driven to move synchronously, and the blocked sieve holes are cleared in sequence by the negative pressure adsorption effect of the clearing mechanism, thereby achieving efficient screening of coal.

[0021] Beneficial effects of the present invention:

[0022] 1. In the present invention, a plurality of chain plates are conveniently driven to move along the outer surface of the shell by a driving assembly, thereby conveniently pushing the mined coal to circulate along the top of the shell. During operation, the sieve holes are used to conveniently screen the coal. In addition, the driving assembly can be linked to the conveyor belt during operation, and the conveyor belt can be used to conveniently transfer the coal that falls through the sieve holes to the outside of the shell for centralized collection. The coal that does not pass through the sieve holes is conveniently pushed down from the end of the shell by the chain plates for collection, thereby facilitating the classification of coal of different particle sizes during operation.

[0023] 2. In the present invention, the linkage mechanism facilitates the driving assembly to realize the reciprocating movement of the inverted U-shaped plate when driving the chain plate to move along the top of the shell. The inverted U-shaped plate that reciprocates along the top of the chain plate conveniently drives several shifting members on the chain plate to swing back and forth through the transmission mechanism, thereby facilitating the chain plate to shift the coal back and forth in the process of pushing it to move, so that the coal can fully contact the sieve holes during the movement, avoiding the coal from not being screened due to failure to contact the sieve holes, thereby helping to improve the screening effect and screening efficiency of the coal.

[0024] 3. In the present invention, the clearing mechanism is conveniently driven by the conveyor belt to operate along the inner wall of the shell. The clearing mechanism uses the negative pressure principle to conveniently clear the blocked sieve holes on the top of the shell in sequence during the movement, thereby making the sieve holes less likely to be blocked, which is beneficial to ensuring the screening efficiency of coal. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] Figure 1 This is a perspective view of a coal screening device for a scraper loader according to the present invention from a first perspective;

[0027] Figure 2 This is a perspective view of a coal screening device for a scraper loader according to the present invention from a second perspective;

[0028] Figure 3 This is a cutaway perspective view of a coal screening device for a scraper loader according to the present invention;

[0029] Figure 4 This is a perspective view of the connection between the drive assembly and the frame of a coal screening device for a scraper loader according to the present invention;

[0030] Figure 5 This is a perspective view of the connection portion between the chain plate and the swing mechanism in a coal screening device for a scraper transfer machine according to the present invention;

[0031] Figure 6 yes Figure 5 Enlarged view of part A;

[0032] Figure 7 This is a three-dimensional diagram of the connection between the toggle member and the transmission mechanism in a coal screening device for a scraper transfer machine according to the present invention;

[0033] Figure 8 This is a perspective view of the connection between the transmission mechanism and the chain plate in a coal screening device for a scraper transfer machine according to the present invention;

[0034] Figure 9 It is a three-dimensional diagram of a blockage clearing mechanism in coal screening equipment used for a scraper transfer machine according to the present invention.

[0035] In the figure: 1. drive assembly; 11. sprocket; 12. chain; 13. roller; 2. frame; 21. groove; 22. side plate; 23. convex plate; 24. support frame; 25. strip plate; 3. housing; 31. sieve hole; 32. chute; 4. chain plate; 5. conveyor belt; 6. clearing mechanism; 61. adsorption plate; 62. partition; 63. negative pressure assembly; 631. negative pressure pump; 632. main adsorption pipe; 63 3. One-way valve; 634. Branch pipe; 7. Swing mechanism; 71. Toggle member; 711. Rotating rod; 712. Paddle; 713. Rotating pin; 72. Inverted U-shaped plate; 73. Transmission mechanism; 731. Through groove; 732. Gear block; 733. Second gear; 74. Linkage mechanism; 741. Rack; 742. First gear; 743. Rotating shaft; 744. Reciprocating screw; 745. Bearing seat; 746. Bump. DETAILED DESCRIPTION

[0036] The following will be combined with the embodiments to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0037] like Figures 1-9 As shown, the present invention is a coal screening device for a scraper loader, comprising a frame 2 with a drive assembly 1, a shell 3 with sieve holes 31 on the top installed between the two frames 2, and a plurality of sieve holes 31 are evenly distributed at equal intervals, and a chain plate 4 driven by the drive assembly 1 is fitted on the outer surface of the shell 3, and a plurality of chain plates 4 are evenly distributed along the outer surface of the shell 3, a conveyor belt 5 is installed on the inner side of the shell 3, and a clearing mechanism 6 for cleaning the sieve holes 31 is provided on the conveyor belt 5, and a swinging mechanism 7 for moving coal is installed between the chain plate 4 and the frame 2; the swinging mechanism 7 includes a toggle member 71, an inverted U-shaped plate 72, a transmission mechanism 73 and a linkage mechanism 74, the inverted U-shaped plate 72 is slidably sleeved on the top of the chain plate 4, the inverted U-shaped plate 72 is connected to the frame 2 through the linkage mechanism 74, a plurality of toggle members 71 are installed in the chain plate 4, and the toggle member 71 is connected to the inverted U-shaped plate 72 through the transmission mechanism 73.

[0038] It should be noted that, when in use, the driving assembly 1 is started to drive the plurality of chain plates 4 to circulate in contact with the outer surface of the shell 3, thereby pushing the coal to move along the top of the shell 3. During the operation of the chain plates 4, the linkage mechanism 74 can be used to drive the inverted U-shaped plates 72 to slide back and forth along the chain plates 4. During the reciprocating sliding of the inverted U-shaped plates 72, the transmission mechanism 73 is used to drive the plurality of toggling members 71 to swing back and forth, thereby not only enabling the chain plates 4 to push the coal to move forward, but also to toggle the coal back and forth during the movement, so that the coal can fully contact the sieve holes 31 on the top of the shell 3, thereby improving the screening effect and screening efficiency.

[0039] The coal that falls through the sieve holes 31 falls on the top of the conveyor belt 5. When the driving component 1 is running, it drives the conveyor belt 5 to operate synchronously, so as to facilitate the transfer of the coal that falls into the shell 3. The coal that fails to pass through the sieve holes 31 is finally pushed by the chain plate 4 and falls from the end of the shell 3. It can be collected by setting a material trough under its end, or by setting a feeder to transport and collect it; when the conveyor belt 5 is running, it drives the clearing mechanism 6 to operate, and the clearing mechanism 6 uses the negative pressure adsorption principle to facilitate the clearing of the blocked sieve holes 31 in sequence, so as to avoid affecting the screening efficiency due to the blockage of the sieve holes 31.

[0040] like Figure 1 and Figure 4 As shown, the frame 2 includes a side panel 22 with a groove 21, a protruding plate 23, a support frame 24 and a strip plate 25. The support frame 24 is installed on the side of the side panel 22 away from the protruding plate 23. The strip plate 25 is installed on the top of the side panel 22. The groove 21 is opened on the side of the side panel 22 close to the shell 3. The protruding plate 23 is installed in the groove 21, and the side panel 22 is connected to the outer wall of the shell 3 through the protruding plate 23.

[0041] It should be noted that the groove 21 is used to conveniently accommodate the sprocket 11 and the chain 12 , and the convex plate 23 is conducive to increasing the contact area between the side plate 22 and the housing 3 , which is conducive to improving the stability of the connection between the housing 3 and the frame 2 .

[0042] like Figure 3-Figure 4 As shown, the drive assembly 1 includes a sprocket 11, a chain 12 and a roller 13. The two rollers 13 are located in the inner cavity of the shell 3 near the two ends, and the two ends of the roller 13 pass through the side wall of the shell 3 and are coaxially connected to the sprocket 11. The conveyor belt 5 is jointly sleeved with the two rollers 13. The sprocket 11 is rotatably set in the groove 21. The two sprockets 11 in the groove 21 are connected by the chain 12, and the chain plate 4 is installed between the two chains 12.

[0043] It should be noted that a motor (not shown in the figure) is provided on the outside of the frame 2 for driving the sprocket 11 to rotate, and the roller 13 is used to facilitate the synchronous operation of the sprockets 11 at both ends. The chain 12 is used for transmission, which not only facilitates the synchronous operation of the four sprockets 11, but also facilitates the two chains 12 to synchronously drive several chain plates 4 to circulate along the outer surface of the shell 3.

[0044] like Figure 5-Figure 6 As shown, the linkage mechanism 74 includes a rack 741, a first gear 742, a rotating shaft 743, a reciprocating screw 744, a bearing seat 745 and a protrusion 746. The protrusion 746 is installed at the top center of the inverted U-shaped plate 72, and the two bearing seats 745 are installed at the top of the chain plate 4 near both ends. The rotating shaft 743 passes through the bearing seat 745 and is rotatably connected thereto. The reciprocating screw 744 is coaxially installed between the two rotating shafts 743. The protrusion 746 is threadedly connected to the reciprocating screw 744. The two racks 741 are respectively installed on the opposite sides of the two strip plates 25. The first gear 742 is connected to the end of the rotating shaft 743, and the first gear 742 is meshed with the rack 741.

[0045] It should be noted that the length of the inverted U-shaped plate 72 is less than the length of the chain plate 4. The chain plate 4 moves to the housing 3 (such as Figure 3 When the first gear 742 is separated from the rack 741, the shaft 743 will not rotate with the movement of the chain plate 4. Therefore, when the chain plate 4 moves to the top of the shell 3, the inverted U-shaped plate 72 will be linked to move back and forth. When the chain plate 4 moves to the bottom of the shell 3, the inverted U-shaped plate 72 will not move.

[0046] like Figure 5 and Figure 7 As shown, the toggle member 71 includes a rotating rod 711, a paddle 712 and a rotating pin 713. The bottom of the chain plate 4 is provided with an annular groove with open structures on both sides. The rotating rod 711 is rotatably connected to the annular groove. The two paddles 712 are symmetrically arranged on the rod wall of the rotating rod 711, and the rotating pin 713 is coaxially installed at the top of the rotating rod 711.

[0047] It should be noted that the cross-sectional diameter of the rotating rod 711 is greater than the thickness of the chain plate 4, that is, part of the side wall of the rotating rod 711 is located on the outside of the chain plate 4. In the initial state, the paddle 712 is perpendicular to the chain plate 4. When the rotating rod 711 rotates back and forth, it drives the paddle 712 to swing back and forth, so that the chain plate 4 can be moved back and forth in the process of pushing the coal forward, so that the overall movement trajectory of the coal is not in a straight line, thereby facilitating the coal and the sieve hole 31 (such as Figure 1 As shown in the figure, the screen surface of the coal is fully contacted to improve the screening effect and efficiency of the coal.

[0048] like Figure 7-Figure 8 As shown, the transmission mechanism 73 includes a through slot 731, a tooth block 732 and a second gear 733. The through slot 731 is set on the chain plate 4 and distributed along its length direction. The top of the rotating pin 713 extends into the through slot 731. The second gear 733 is fixedly sleeved on the top of the rotating pin 713. The tooth block 732 is installed on the inner side wall of the inverted U-shaped plate 72 and is slidably connected to the through slot 731. The two adjacent tooth blocks 732 are staggered, and the gears are meshed with the corresponding second gear 733.

[0049] It should be noted that the rotating pin 713 passes through the bottom of the annular groove and extends into the through groove 731. A bearing is rotatably installed between the rotating pin 713 and the bottom of the annular groove. In this embodiment, the distribution path of each group of sieve holes 31 along the length direction of the shell 3 passes through between two adjacent rotating rods 711. The two adjacent tooth blocks 732 are staggered, so that the two adjacent rotating rods 711 can drive the paddles 712 to deflect and move closer synchronously, thereby facilitating the paddle movement of the coal between the two rotating rods 711 to gather toward the sieve holes 31, thereby improving the contact effect between the coal and the sieve holes 31.

[0050] like Figure 3 and Figure 9 As shown, the clearing mechanism 6 includes an adsorption plate 61, a partition 62 and a negative pressure component 63. The adsorption plate 61 is a hollow structure with an open top. The adsorption plate 61 is installed on the top of the conveyor belt 5, and the adsorption plate 61 is located directly below one of the chain plates 4. Several partitions 62 are evenly installed between the inner walls of the adsorption plate 61. The negative pressure component 63 is installed on the top of the conveyor belt 5 and is connected to the inner cavity of the adsorption plate 61.

[0051] It should be noted that the tops of the adsorption plate 61 and the partition 62 are both provided with sealing strips that can fit with the inner upper surface of the shell 3, thereby ensuring that the negative pressure chamber is in a closed state when the adsorption plate 61 fits with the inner upper surface of the shell 3. In order to prevent the coal falling through the sieve hole 31 from entering the adsorption plate 61, in this embodiment, the adsorption plate 61 is set directly below one of the chain plates 4, because no coal will fall directly below the chain plate 4.

[0052] like Figure 1 and Figure 9 As shown, the negative pressure component 63 includes a negative pressure pump 631, a main adsorption tube 632 and a branch tube 634 with a one-way valve 633. The partition 62 divides the inner cavity of the adsorption plate 61 into several negative pressure chambers corresponding to the sieve holes 31. The branch tube 634 is connected to the negative pressure chamber. Multiple branch tubes 634 are connected to the main adsorption tube 632. The input end of the negative pressure pump 631 is connected to the main adsorption tube 632.

[0053] It should be noted that the number of negative pressure chambers is the same as the number of sieve holes 31 in each column along the width direction of the shell 3, and the negative pressure chamber is located below the corresponding sieve hole 31. In this embodiment, the diameter of the sieve hole 31 is slightly larger than the thickness of the chain plate 4. That is to say, when the chain plate 4 is located directly above a row of multiple sieve holes 31, it cannot completely cover them, ensuring that when a certain sieve hole 31 is blocked, the corresponding negative pressure chamber will form a negative pressure state under the suction action of the negative pressure component 63. At this time, since the sieve hole 31 is not completely covered, the external air pressure can directly squeeze the blockage in the sieve hole 31 into the negative pressure chamber. In order to prevent the blockage from being sucked into the branch pipe 634, a baffle can be set at the pipe mouth of the branch pipe 634. In addition, the conveyor belt 5 (such as Figure 5 A battery (not shown in the figure) is also provided on the negative pressure pump 631 for supplying power to the negative pressure pump 631.

[0054] like Figure 2-Figure 3 As shown, the width of the conveyor belt 5 is equal to the width of the inner cavity of the shell 3, and a material drop chute 32 is opened through the bottom of the shell 3.

[0055] It should be noted that the two sides of the conveyor belt 5 are in contact with the inner wall of the shell 3 to ensure that the screened coal can all fall on the upper surface of the conveyor belt 5. The continuous operation of the conveyor belt 5 will cause the coal on the upper surface to fall to the inner lower surface of the shell 3. Since the conveyor belt 5 will drive the adsorption plate 61 (such as Figure 9 As shown in the figure, the adsorption plate 61 operates synchronously with the conveyor belt 5. When the adsorption plate 61 runs below the conveyor belt 5, it is convenient to push the coal on the lower surface of the shell 3 so that it can be discharged through the chute 32. At the same time, when the adsorption plate 61 passes through the chute 32, the blockage inside it is automatically discharged through the chute 32 under the action of gravity.

[0056] An embodiment of the present invention provides a coal screening method for a scraper loader, comprising the following steps:

[0057] Step 1: Start the drive assembly 1 to drive a plurality of chain plates 4 to circulate along the outer surface of the shell 3. The running chain plates 4 continuously push the coal to slide along the top of the shell 3, and the mesh 31 can be used to screen the moving coal.

[0058] Step 2: During the operation of the chain plate 4, the swing mechanism 7 is used to reciprocate the coal on the top of the shell 3 so that the coal can fully contact the screen holes 31 and be fully screened. During the screening process, the coal that falls through the screen holes 31 is discharged and collected by the conveyor belt 5 inside the shell 3, and the coal that is not screened slides down and is collected from the end of the shell 3;

[0059] Step 3: During the operation of the conveyor belt 5 , the clearing mechanism 6 is driven to move synchronously, and the blocked sieve holes 31 are cleared in sequence by the negative pressure adsorption effect of the clearing mechanism 6 , thereby achieving efficient screening of the coal.

[0060] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A coal screening device for a scraper loader, comprising a frame (2) with a drive assembly (1), characterized in that: A shell (3) with a sieve hole (31) on the top is installed between the two frames (2), a chain plate (4) driven by the drive assembly (1) is attached to the outer surface of the shell (3), a conveyor belt (5) is installed inside the shell (3), and a clearing mechanism (6) for clearing the sieve hole (31) is provided on the conveyor belt (5), and a swing mechanism (7) for moving coal is installed between the chain plate (4) and the frame (2); The swing mechanism (7) includes a toggle member (71), an inverted U-shaped plate (72), a transmission mechanism (73) and a linkage mechanism (74); the inverted U-shaped plate (72) is slidably sleeved on the top of the chain plate (4); the inverted U-shaped plate (72) is connected to the frame (2) via the linkage mechanism (74); a plurality of the toggle members (71) are installed in the chain plate (4); and the toggle members (71) are connected to the inverted U-shaped plate (72) via the transmission mechanism (73); The frame (2) includes a side plate (22) with a groove (21), a convex plate (23), a support frame (24) and a strip plate (25), wherein the support frame (24) is mounted on a side of the side plate (22) away from the convex plate (23), the strip plate (25) is mounted on the top of the side plate (22), the groove (21) is provided on a side of the side plate (22) close to the shell (3), the convex plate (23) is mounted in the groove (21), and the side plate (22) is connected to the outer side wall of the shell (3) through the convex plate (23); The toggle member (71) includes a rotating rod (711), a paddle (712) and a rotating pin (713); an annular groove with two openings on both sides is provided at the bottom of the chain plate (4); the rotating rod (711) is rotatably connected to the annular groove; the two paddles (712) are symmetrically arranged on the rod wall of the rotating rod (711); and the rotating pin (713) is coaxially mounted on the top of the rotating rod (711); The blockage clearing mechanism (6) comprises an adsorption plate (61), a partition plate (62) and a negative pressure assembly (63). The adsorption plate (61) is a hollow structure with an open top. The adsorption plate (61) is mounted on the top of the conveyor belt (5), and the adsorption plate (61) is located directly below one of the chain plates (4). Several partition plates (62) are evenly mounted between the inner walls of the adsorption plate (61). The negative pressure assembly (63) is mounted on the top of the conveyor belt (5) and is in communication with the inner cavity of the adsorption plate (61).

2. The coal screening device for a scraper loader according to claim 1, characterized in that: The driving assembly (1) includes a sprocket (11), a chain (12) and a roller (13), wherein the two rollers (13) are located in the inner cavity of the housing (3) near the two ends, and the two ends of the roller (13) pass through the side wall of the housing (3) and are coaxially connected to the sprocket (11), the conveyor belt (5) and the two rollers (13) are connected together, the sprocket (11) is rotatably set in the groove (21), the two sprockets (11) in the groove (21) are connected by the chain (12), and the chain plate (4) is installed between the two chains (12).

3. The coal screening device for a scraper loader according to claim 1, characterized in that: The linkage mechanism (74) includes a rack (741), a first gear (742), a rotating shaft (743), a reciprocating screw (744), a bearing seat (745) and a protrusion (746), wherein the protrusion (746) is mounted at the top center of the inverted U-shaped plate (72), the two bearing seats (745) are mounted on the top of the chain plate (4) near both ends, the rotating shaft (743) passes through the bearing seat (745) and is rotatably connected thereto, the reciprocating screw (744) is coaxially mounted between the two rotating shafts (743), the protrusion (746) is threadedly sleeved with the reciprocating screw (744), the two racks (741) are respectively mounted on opposite sides of the two strip plates (25), the first gear (742) is connected to the end of the rotating shaft (743), and the first gear (742) is meshed with the rack (741).

4. The coal screening device for a scraper loader according to claim 1, characterized in that: The transmission mechanism (73) includes a through slot (731), a tooth block (732) and a second gear (733). The through slot (731) is arranged on the chain plate (4) and distributed along its length direction. The top end of the rotating pin (713) extends into the through slot (731). The second gear (733) is fixedly mounted on the top end of the rotating pin (713). The tooth block (732) is installed on the inner side wall of the inverted U-shaped plate (72) and is slidably connected to the through slot (731). Two adjacent tooth blocks (732) are staggered, and the gears are meshed with the corresponding second gears (733).

5. The coal screening device for a scraper loader according to claim 1, characterized in that: The negative pressure component (63) includes a negative pressure pump (631), a main adsorption tube (632), and a branch tube (634) with a one-way valve (633). The partition (62) divides the inner cavity of the adsorption plate (61) into a plurality of negative pressure cavities corresponding to the sieve holes (31). The branch tube (634) is connected to the negative pressure cavity. The plurality of branch tubes (634) are connected to the main adsorption tube (632). The input end of the negative pressure pump (631) is connected to the main adsorption tube (632).

6. The coal screening equipment for scraper loader according to claim 1, characterized in that: The width of the conveyor belt (5) is equal to the width of the inner cavity of the shell (3), and a material drop chute (32) is provided through the bottom of the shell (3).

7. A method for screening coal for a scraper transfer machine, applied to the coal screening equipment for a scraper transfer machine according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Start the driving assembly (1) to drive a plurality of chain plates (4) to circulate in contact with the outer surface of the shell (3), and use the running chain plates (4) to continuously push the coal to slide along the top of the shell (3), and use the sieve holes (31) to screen the moving coal; Step 2: During the operation of the chain plate (4), the swing mechanism (7) is used to reciprocate the coal on the top of the shell (3), so that the coal can fully contact the sieve holes (31) and be fully screened. During the screening process, the coal that falls through the sieve holes (31) is discharged and collected via the conveyor belt (5) inside the shell (3), and the coal that is not screened slides down and is collected from the end of the shell (3); Step 3: The conveyor belt (5) drives the clearing mechanism (6) to move synchronously during operation, and utilizes the negative pressure adsorption effect of the clearing mechanism (6) to sequentially clear the blocked sieve holes (31), thereby achieving efficient screening of the coal.

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