Coal screening equipment and screening method for scraper reversed loader

Abstract

The invention discloses coal screening equipment and a coal screening method for a scraper reversed loader, relates to the technical field of coal screening, and solves the technical problem that the screening effect is affected due to the fact that coal is difficult to make full contact with filter holes in the process of pushing the coal to move by existing coal screening equipment. Comprising racks with driving assemblies, a shell with screen holes in the top is installed between the two racks, a chain plate driven by the driving assemblies is arranged on the outer surface of the shell in an attached mode, a conveying belt is installed on the inner side of the shell, a blockage clearing mechanism for clearing the screen holes is arranged on the conveying belt, and a swing mechanism for stirring coal is installed between the chain plate and the racks; the swing mechanism comprises a stirring piece, an inverted-U-shaped plate, a transmission mechanism and a linkage mechanism. The inverted-U-shaped plate is arranged at the top end of the chain plate in a sliding and sleeving mode. According to the coal screening device, coal can be stirred in a reciprocating mode in the process that the chain plate pushes the coal to advance, so that the coal can make full contact with the screening holes conveniently, the screening effect can be improved, and the screening efficiency can be improved conveniently.

Description

Technical Field

[0001] The 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] The scraper loader is a device used to transport mined coal. In the existing process, after the coal is transported by the scraper loader, it needs to be transferred multiple times by transport vehicles to screening equipment for centralized processing. Due to the huge amount of coal mined, the transportation frequency and transportation cost increase.

[0003] The Chinese patent publication number CN117772585B discloses a coal screening device for a scraper transfer machine, in which 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 arranged on the chain plate, and a lower pressure frame is arranged on the filter holes of the filter plate, so that 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, so that the dredging rod dredges the filter holes of the filter plate to prevent the coal from blocking 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 transfer machine, 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] The first aspect of the present invention provides a coal screening device for a scraper transfer machine, comprising a frame with a driving assembly, a shell with a sieve hole on the top is installed between two of the frames, a chain plate driven by the driving assembly is attached to the outer surface of the shell, a conveyor belt is installed inside the shell, and a clearing mechanism for clearing the sieve hole is provided on the conveyor belt, and a swing mechanism for moving coal is installed 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, and 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 is jointly sleeved with the two rollers, 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 thereto, the reciprocating screw is coaxially installed between the two rotating shafts, the protrusion is threadedly sleeved with 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 opening 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 swing pin extends into the through slot, the second gear is fixedly sleeved on the top end of the swing 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 opening at the 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, a number of the partitions are evenly installed between the inner walls of the adsorption plates, and 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 assembly includes a negative pressure pump, a main adsorption tube, and a branch tube with a one-way valve. The partition divides the inner cavity of the adsorption plate into several negative pressure cavities corresponding to the sieve holes. The branch tube is communicated with the negative pressure cavity, and a plurality of the branch tubes are jointly communicated with the main adsorption tube. The input end of the negative pressure pump is communicated with the main adsorption tube.

[0016] As a further solution of the present invention: the width of the conveyor belt is equal to the inner cavity width of the housing, and a blanking groove is penetrated and opened at the bottom of the housing.

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

[0018] Step 1: Start the driving assembly to drive a plurality of chain plates to circulate along the outer surface of the housing, and use the running chain plates to continuously push the coal to slide along the top of the housing. The moving coal can be screened by using the sieve holes.

[0019] Step 2: During the operation of the chain plates, use the swinging mechanism to reciprocally stir the coal on the top of the housing, so that the coal can fully contact the sieve holes, and the coal can be fully screened. During the screening process, the coal falling through the sieve holes is discharged and collected through the conveyor belt inside the housing, and the coal not sieved down slides and is collected from the end of the housing.

[0020] Step 3: During the operation of the conveyor belt, drive the clogging clearing mechanism to move synchronously, and use the negative pressure adsorption effect of the clogging clearing mechanism to sequentially clean the blocked sieve holes, so as to achieve efficient screening of coal.

[0021] The beneficial effects of the present invention:

[0022] 1. In the present invention, the driving assembly conveniently drives a plurality of chain plates to move along the outer surface of the housing, so as to conveniently and circularly push the mined coal to run along the top of the housing. During the running process, the coal can be conveniently screened by using the sieve holes. In addition, during the operation of the driving assembly, the conveyor belt can be driven to operate. The conveyor belt conveniently transports the coal falling through the sieve holes to the outside of the housing for centralized collection, and the coal not passing through the sieve holes can be conveniently pushed down from the end of the housing by the chain plates for collection, so that coal of different particle sizes can be classified during the running process.

[0023] 2. In the present invention, the linkage mechanism is used to facilitate the driving component 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 drives a number of 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 with the sieve holes during the movement, avoiding the failure of the coal to be screened due to the failure of the coal to contact with 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 utilizes the negative pressure principle to conveniently clear the blocked sieve holes on the top of the shell in sequence during the movement, thereby making it difficult for the sieve holes to be blocked, which is beneficial to ensuring the screening efficiency of the coal. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 1 It is a stereoscopic diagram of a coal screening device for a scraper transfer machine of the present invention from a first viewing angle;

[0027] Figure 2 It is a stereogram of a coal screening device for a scraper transfer machine of the present invention from a second viewing angle;

[0028] Figure 3 It is a cutaway perspective view of a coal screening device for a scraper transfer machine of the present invention;

[0029] Figure 4 It is a stereoscopic diagram of the connection part between the driving assembly and the frame in a coal screening device for a scraper transfer machine of the present invention;

[0030] Figure 5 It is a stereoscopic diagram of the connection part between the chain plate and the swing mechanism in a coal screening device for a scraper transfer machine of the present invention;

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

[0032] Figure 7 It is a stereoscopic diagram of the connection part between the toggle member and the transmission mechanism in a coal screening device for a scraper transfer machine of the present invention;

[0033] Figure 8 It is a stereoscopic diagram of the connecting part of the transmission mechanism and the chain plate in a coal screening device for a scraper transfer machine of the present invention;

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

[0035] In the figure: 1. Driving 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. Discharge chute; 4. Chain plate; 5. Conveyor belt; 6. Blockage clearing mechanism; 61. Adsorption plate; 62. Partition board; 63. Negative pressure assembly; 631. Negative pressure pump; 632. Main adsorption pipe; 633. Check valve; 634. Branch pipe; 7. Swing mechanism; 71. Poking member; 711. Rotating rod; 712. Poking piece; 713. Rotating pin; 72. Inverted U-shaped plate; 73. Transmission mechanism; 731. Through groove; 732. Tooth block; 733. Second gear; 74. Linkage mechanism; 741. Rack; 742. First gear; 743. Rotating shaft; 744. Reciprocating lead screw; 745. Bearing seat; 746. Convex block. Specific implementation manner

[0036] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments. 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 making creative efforts belong to the scope of protection of the present invention.

[0037] As Figures 1 - 9 shown, the present invention is a coal screening device for a scraper conveyor, including a frame 2 with a driving assembly 1. A housing 3 with sieve holes 31 at the top is installed between two frames 2. A plurality of sieve holes 31 are evenly distributed at equal intervals. A chain plate 4 driven by the driving assembly 1 is attached to the outer surface of the housing 3. A plurality of chain plates 4 are evenly distributed along the outer surface of the housing 3. A conveyor belt 5 is installed inside the housing 3, and a blockage clearing mechanism 6 for cleaning the sieve holes 31 is provided on the conveyor belt 5. A swing mechanism 7 for poking coal is installed between the chain plate 4 and the frame 2; the swing mechanism 7 includes a poking 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 poking members 71 are installed in the chain plate 4, and the poking members 71 are 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 a plurality of chain plates 4 to fit the outer surface of the shell 3 for cyclic operation, thereby pushing the coal to move along the top of the shell 3. During the operation of the chain plate 4, the linkage mechanism 74 can be used to drive the inverted U-shaped plate 72 to slide back and forth along the chain plate 4. During the reciprocating sliding of the inverted U-shaped plate 72, the transmission mechanism 73 is used to drive a plurality of toggling members 71 to swing back and forth, thereby not only enabling the chain plate 4 to push the coal to move forward, but also to toggle the coal back and forth during the moving process, so that the coal can fully contact the sieve hole 31 at 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 synchronously drives the conveyor belt 5 to operate, 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 dropped from the end of the shell 3 under the push of the chain plate 4, and can be collected by setting a material trough under the end thereof, 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 facilitates the clearing of the blocked sieve holes 31 in turn through the principle of negative pressure adsorption, 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 plate 22 with a groove 21, a convex plate 23, a support frame 24 and a strip plate 25, the support frame 24 is installed on the side of the side plate 22 away from the convex plate 23, the strip plate 25 is installed on the top of the side plate 22, the groove 21 is opened on the side of the side plate 22 close to the shell 3, the convex plate 23 is installed in the groove 21, and the side plate 22 is connected to the outer wall of the shell 3 through the convex 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 , and is conducive to improving the stability of the connection between the housing 3 and the frame 2 .

[0042] like Figures 3 - 4 As shown, the driving 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 rollers 13 pass through the side walls 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 a roller 13 is used to facilitate the synchronous operation of the sprockets 11 at both ends. The transmission by the chain 12 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 Figures 5 - 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. 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 sleeved with 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 reciprocated by the linkage, and 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 opening 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 on 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 reciprocates, it drives the paddle 712 to swing back and forth, so that the chain plate 4 can reciprocate in the process of pushing the coal forward, so that the overall moving trajectory of the coal is not in a straight line, thereby facilitating the coal and the sieve hole 31 (such asFigure 1 make full contact as shown in the figure, improving the screening effect and efficiency of coal.

[0048] As Figures 7 - 8 shown, the transmission mechanism 73 includes a through groove 731, a tooth block 732, and a second gear 733. The through groove 731 is disposed through the link plate 4 and distributed along its length direction. The top end of the rotating pin 713 extends into the through groove 731. The second gear 733 is fixedly sleeved 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 groove 731. Adjacent two tooth blocks 732 are staggered, and the gear meshes with the corresponding second gear 733.

[0049] It should be noted that the rotating pin 713 penetrates 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 housing 3 passes through between adjacent two rotating rods 711. Adjacent two tooth blocks 732 are staggered, so that adjacent two rotating rods 711 can drive the paddles 712 to synchronously deflect and approach, thus facilitating the movement of the coal between the two rotating rods 711 towards the sieve holes 31 and improving the contact effect between the coal and the sieve holes 31.

[0050] As Figure 3 and Figure 9 shown, the blockage clearing mechanism 6 includes 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 installed on the top of the conveyor belt 5 and is located directly below one of the link plates 4. A plurality of partition plates 62 are evenly installed between the inner walls of the adsorption plate 61. The negative pressure assembly 63 is installed on the top of the conveyor belt 5 and is communicated with the inner cavity of the adsorption plate 61.

[0051] It should be noted that sealing strips that can fit with the inner upper surface of the housing 3 are provided on the tops of the adsorption plate 61 and the partition plate 62, so as to ensure that the negative pressure cavity is in a closed state when the adsorption plate 61 fits with the inner upper surface of the housing 3. In order to prevent the coal falling through the sieve holes 31 from entering the adsorption plate 61, in this embodiment, the adsorption plate 61 is arranged directly below one of the link plates 4, because no coal will fall directly below the link plate 4.

[0052] As Figure 1 and Figure 9 shown, the negative pressure assembly 63 includes a negative pressure pump 631, a main adsorption pipe 632, and a branch pipe 634 with a one-way valve 633. The partition plate 62 divides the inner cavity of the adsorption plate 61 into several negative pressure cavities corresponding to the sieve holes 31. The branch pipe 634 is communicated with the negative pressure cavity. A plurality of branch pipes 634 are jointly communicated with the main adsorption pipe 632. The input end of the negative pressure pump 631 is communicated with the main adsorption pipe 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, 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 to make it enter 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 storage battery (not shown in the figure) for supplying power to the negative pressure pump 631 is also provided.

[0054] like Figures 2 - 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 lower surface of the shell 3. Since the conveyor belt 5 will drive the adsorption plate 61 (such as Figure 9 When the adsorption plate 61 moves to the bottom of 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] The embodiment of the present invention provides a coal screening method for a scraper transfer machine, comprising the following steps:

[0057] Step 1: Start the driving assembly 1 to drive a plurality of chain plates 4 to fit the outer surface of the shell 3 for cyclic operation, 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;

[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 sieve hole 31, so that the coal can be fully screened. During the screening process, the coal that falls through the sieve hole 31 is discharged and collected via the conveyor belt 5 inside the shell 3, and the coal that is not screened slides down from the end of the shell 3 and is collected;

[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 utilizing the negative pressure adsorption effect of the clearing mechanism 6 , thereby realizing efficient screening of the coal.

[0060] The above has described in detail an embodiment of the present invention, but the above content is only a preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made in accordance with the scope of the application of the present invention shall still fall within the scope covered by the patent 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 a driving assembly (1) is provided on 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) comprises 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 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).

2. The coal screening device for a scraper transfer machine according to claim 1, characterized in that: The frame (2) comprises a side plate (22) with a groove (21), a convex plate (23), a support frame (24) and a strip plate (25); the support frame (24) is installed on a side of the side plate (22) away from the convex plate (23); the strip plate (25) is installed 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 installed 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).

3. The coal screening device for a scraper transfer machine according to claim 1, characterized in that: The driving assembly (1) comprises a sprocket (11), a chain (12) and a roller (13); the two rollers (13) are located in an inner cavity near two ends of a housing (3); and the two ends of the rollers (13) penetrate through the side walls of the housing (3) and are coaxially connected to the sprocket (11); the conveyor belt (5) is sleeved with the two rollers (13); the sprocket (11) is rotatably arranged in a groove (21); the two sprockets (11) in the groove (21) are connected by a chain (12); and the chain plate (4) is installed between the two chains (12).

4. The coal screening device for a scraper transfer machine according to claim 2, characterized in that: The linkage mechanism (74) comprises 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 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).

5. The coal screening device for a scraper transfer machine according to claim 1, characterized in that: The toggle member (71) comprises a rotating rod (711), a toggle piece (712) and a rotating pin (713); an annular groove with 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 toggle pieces (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).

6. The coal screening device for a scraper transfer machine according to claim 5, characterized in that: The transmission mechanism (73) comprises 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 is distributed along the length direction thereof; the top end of the rotating pin (713) extends into the through slot (731); the second gear (733) is fixedly sleeved on the top end of the rotating pin (713); the tooth block (732) is mounted 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 arranged in an alternating manner, and the gear is meshed with the corresponding second gear (733).

7. The coal screening device for a scraper transfer machine according to claim 1, characterized in that: The blockage clearing mechanism (6) comprises an adsorption plate (61), a partition plate (62) and a negative pressure component (63); the adsorption plate (61) is a hollow structure with an opening at the 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); a plurality of partition plates (62) are evenly mounted between the inner walls of the adsorption plate (61); and the negative pressure component (63) is mounted on the top of the conveyor belt (5) and is connected to the inner cavity of the adsorption plate (61).

8. The coal screening device for a scraper transfer machine according to claim 7, 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 chambers corresponding to the sieve holes (31); the branch tube (634) is connected to the negative pressure chamber; a plurality of branch tubes (634) are connected to the main adsorption tube (632); and the input end of the negative pressure pump (631) is connected to the main adsorption tube (632).

9. The coal screening device for a scraper transfer machine 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 trough (32) is provided through the bottom of the shell (3).

10. A method for screening coal for a scraper transfer machine, applied to the coal screening device for a scraper transfer machine according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Start the driving assembly (1) to drive a plurality of chain plates (4) to fit the outer surface of the shell (3) for cyclic operation, 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 from the end of the shell (3) and is collected; 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 utilizing the negative pressure adsorption effect of the clearing mechanism (6), thereby realizing efficient screening of the coal.

Images