A multi-stage coal gangue screening device

Abstract

The present invention discloses a multi-stage coal gangue screening device, which relates to the technical field of coal gangue screening. It includes a screening mechanism and a cleaning conveyor motor installed on one side of the screening mechanism. An inclination mechanism is arranged at the bottom of the screening mechanism, and an inclination motor is arranged on one side at the bottom of the inclination mechanism. The screening mechanism includes a screening box. A first support disk is fixedly installed on one side of the screening box, and a second support disk is fixedly installed at one end of the screening box away from the first support disk. Rotating bearings are rotatably connected inside the first support disk and the second support disk. A crushing drum is fixedly installed between the two rotating bearings. By setting the screening mechanism, the rotating motor can be used to drive the crushing drum to rotate, and the first crushing protrusions are used to collide with the coal gangue, so as to crush the coal gangue and coal. The cleaning conveyor motor is used to drive the conveying roller and the spiral blade to rotate, which can sweep the coal particles on the inner wall of the crushing drum and discharge them through the material guiding groove.

Description

Technical Field

[0001] The present invention relates to the technical field of coal gangue screening, and specifically to a multi-stage coal gangue screening device. Background Art

[0002] Coal gangue is a solid waste discharged during the coal mining process and the coal washing process. It is a black-gray rock with a relatively low carbon content and harder than coal, which is associated with the coal seam during the coal formation process. The accumulation of coal gangue not only occupies land, but also can spontaneously combust, pollute the air or cause fires. The existing coal gangue screening devices only have single-stage screening, with low screening efficiency, unable to achieve a uniform screening effect, and dust flying during screening, without dust removal effect, easily causing environmental pollution.

[0003] Publication No. CN 114588961 A discloses a high-efficiency multi-stage coal gangue screening device. By the swinging of the four sides of the cone, the first extrusion block extrudes the coal gangue to be screened. When the first extrusion block presses on the coal gangue, the first spring will be compressed. When the first extrusion block presses on the coal, it will crush it. The coal gangue and the crushed coal will fall onto the first screen. The raised blocks drive the tile blocks to vibrate, thereby driving the screen to vibrate. In this way, the crushed coal will leak from the first screen to the first material receiving trough, while the coal gangue and the uncrushed coal will fall onto the iron sheet conveyor belt through the second material receiving trough. Through the extrusion of the second extrusion block, the coal will be crushed while the coal gangue will compress the third spring. The extruded coal and coal gangue fall onto the iron sheet conveyor belt and then into the fourth housing. The crushed coal will be conveyed by the screw rod and fall from the second screen below the fourth housing to the second discharge trough and slide out of the device, while the coal gangue will be conveyed to the first discharge trough and slide out of the device. However, the following problems still exist in the actual use of this patent:

[0004] This high-efficiency multi-stage coal gangue screening device drives the first extrusion block to extrude the coal gangue to be screened by the swinging of the four sides of the cone. When the first extrusion block presses on the coal gangue, the first spring will be compressed. When the first extrusion block presses on the coal, it will crush it. However, when extruding and crushing the coal gangue, the crushing force cannot be controlled, and it is very easy to cause the phenomenon that the coal gangue and the coal are crushed together, which is not only not conducive to the screening of coal gangue and coal, but also will increase the difficulty of coal gangue screening, thus affecting the efficiency of coal gangue screening.

[0005] The present invention proposes a multi-stage coal gangue screening device to facilitate the solution of the problems raised above. Summary of the Invention

[0006] The object of the present invention is to provide a multi-stage coal gangue screening device to solve the problem proposed in the above background technology that the high-efficiency multi-stage coal gangue screening device drives the first extrusion block to extrude the coal gangue to be screened by swinging around the cone. When the first extrusion block presses on the coal gangue, it will compress the first spring. When the first extrusion block presses on the coal, it will crush it. However, when extruding and crushing the coal gangue, the crushing force cannot be controlled, and it is easy to cause the phenomenon that the coal gangue and the coal are broken together, which is not only not conducive to the screening of the coal gangue and the coal, but also increases the difficulty of coal gangue screening, thus affecting the coal gangue screening efficiency.

[0007] To achieve the above object, the present invention provides the following technical solution: A multi-stage coal gangue screening device, including a screening mechanism, and a cleaning and conveying motor installed on one side of the screening mechanism;

[0008] An inclination mechanism is provided at the bottom of the screening mechanism, and an inclination motor is provided on one side of the bottom of the inclination mechanism;

[0009] The screening mechanism includes a screening box, a first support disk is fixedly installed on one side of the screening box, and a second support disk is fixedly installed at one end of the screening box away from the first support disk;

[0010] Among them, rotating bearings are rotatably connected inside the first support disk and the second support disk, and a crushing drum is fixedly installed between the two rotating bearings;

[0011] Among them, a number of first crushing protrusions are fixedly installed inside the crushing drum, and a rotating motor is fixedly installed on one side inside the first support disk.

[0012] Preferably, the output end of the rotating motor is fixedly connected to a driving bevel gear, a meshing bevel gear disk is meshed on one side of the driving bevel gear, a number of driven bevel gears are meshed on the outside of the meshing bevel gear disk, the meshing bevel gear disk is fixedly connected to the rotating bearing, and the cleaning and conveying motor is fixedly installed on the outside of the first support disk.

[0013] Preferably, the output end of the cleaning and conveying motor is fixedly connected to a conveying roller, the conveying roller is rotatably connected to the second support disk, a spiral blade is fixedly installed on the outside of the conveying roller, a number of support sleeves are fixedly installed on the outside of the spiral blade, the number of the support sleeves are arranged at equal intervals, and a telescopic sliding groove is opened inside the support sleeve.

[0014] Preferably, a telescopic spring is arranged inside the telescopic sliding groove, a spring damper is arranged inside the telescopic spring, the end of the spring damper is fixedly connected to a telescopic baffle, a telescopic sliding rod is fixedly connected to the outside of the telescopic baffle, the end of the telescopic sliding rod is fixedly connected to a cleaning brush, and the lengths of the telescopic sliding rods on the outside of the number of support sleeves are arranged in an increasing manner.

[0015] Preferably, a collection groove is arranged inside the screening box near the bottom of the spiral blade. A plurality of second crushing protrusions are fixedly installed at the bottom of the collection groove. Connecting blocks are symmetrically installed on both sides of the top of the collection groove. A first spring connecting piece is fixedly connected to the bottom of the connecting block. A vibration spring is fixedly connected to the bottom of the first spring connecting piece. A spring telescopic rod is arranged inside the vibration spring. A second spring connecting piece is fixedly installed at the bottom of the spring telescopic rod. The two second spring connecting pieces are respectively fixedly connected to the first support plate and the second support plate.

[0016] Preferably, a material guiding groove is fixedly installed on the outer side of the second support plate. A discharge cover is rotatably connected to the bottom of the second support plate near the material guiding groove. A fixing bolt is threadedly connected to one side inside the discharge cover.

[0017] Preferably, the tilting mechanism includes a tilting base. A tilting chute is formed at the top of the tilting base. A motor protection cover is fixedly installed on one side of the bottom of the tilting base. The tilting motor is fixedly installed on one side inside the motor protection cover. The output end of the tilting motor is fixedly connected to a sprocket transmission assembly.

[0018] Preferably, tilting threaded rods are symmetrically connected to one side of the sprocket transmission assembly. Tilting threaded sleeves are threadedly connected to the outer sides of the tilting threaded rods. A tilting rotating rod is rotatably connected to the top of the tilting threaded sleeve. The end of the tilting rotating rod is rotatably connected to a rotating support.

[0019] Preferably, a support frame is fixedly installed on the tops of the two rotating supports. A placement groove is formed inside the top of the support frame. Support limit blocks are symmetrically installed on one side of the top of the tilting base. Connecting hinges are symmetrically installed on the side of the tilting base away from the support limit blocks. The tilting base is rotatably connected to the support frame through the connecting hinges.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: For this multi-stage coal gangue screening device, by setting the screening mechanism, not only can the rotating motor drive the crushing drum to rotate, and the first crushing protrusions inside the crushing drum collide with the coal gangue, so as to crush the coal gangue and coal, but also the cleaning conveyor motor drives the conveyor roller and the spiral blade to rotate, which can sweep the coal particles attached to the inner wall of the crushing drum and discharge them through the material guiding groove. By setting the tilting mechanism, the tilting motor can tilt the support frame by a certain angle, which can not only realize the dumping of the screened coal gangue, but also facilitate pouring the unscreened coal gangue into the crushing drum through the discharge cover for the crushing and screening of the coal gangue. The specific content is as follows:

[0021] 1. By setting up a screening mechanism, not only can the rotation motor drive the driving bevel gear to rotate, and through the meshing action among the driving bevel gear, the meshing bevel gear disc and the driven bevel gear, the rotation of the rotating bearing and the crushing drum can be realized. The first crushing protrusions inside the crushing drum collide with the coal gangue, thereby crushing the coal gangue and coal. Since the hardness of the coal gangue is greater than that of the coal, through the collision between the first crushing protrusions and the coal gangue, the coal is crushed, realizing the separation of the coal and the coal gangue. The crushed coal will adhere to the inner wall of the crushing drum and move to the top of the crushing drum as the crushing drum rotates. At the same time, the cleaning conveyor motor drives the conveyor roller and the spiral blade to rotate, and under the elastic force of the telescopic spring, the cleaning brush fits with the inner wall of the crushing drum, thereby sweeping down the coal particles adhering to the inner wall of the crushing drum, falling onto the surface of the collection tank, and discharging the coal through the guide chute by the spiral blade, thus realizing the screening function of the coal and the coal gangue. At the same time, since the lengths of the telescopic sliding rods outside the spiral blade are different, when the spiral blade rotates, it will knock on the collection tank, and under the elastic force of the vibration spring, the reciprocating vibration of the collection tank is realized, and the second crushing protrusions at the bottom of the collection tank further knock on the coal gangue, thereby improving the screening effect of the coal gangue;

[0022] 2. By setting up an inclination mechanism, the inclination motor can drive the sprocket transmission assembly and the inclination threaded rod to rotate, make the inclination threaded sleeve move on the inclination threaded rod, and drive the inclination rotating rod to rotate. Under the action of the connecting hinge, the support frame is inclined at a certain angle, which can not only realize the dumping of the screened coal gangue, but also facilitate pouring the unscreened coal gangue into the inside of the crushing drum through the discharge cover for the crushing and screening of the coal gangue. Brief Description of the Drawings

[0023] Figure 1 is the overall three-dimensional structure schematic diagram of the present invention;

[0024] Figure 2 is the three-dimensional structure schematic diagram of the cross-section of the screening mechanism in the present invention;

[0025] Figure 3 is the three-dimensional structure schematic diagram of the crushing drum and the first crushing protrusions in the present invention;

[0026] Figure 4 is the three-dimensional structure schematic diagram of the rotating bearing and the meshing bevel gear disc in the present invention;

[0027] Figure 5 is the three-dimensional structure schematic diagram of the spiral blade and the collection tank in the present invention;

[0028] Figure 6 is the three-dimensional structure schematic diagram of the cross-section of the support sleeve in the present invention;

[0029] Figure 7 of the present inventionFigure 5 Schematic diagram of the enlarged structure of area A in the present invention;

[0030] Figure 8 3D structure diagram of the tilting mechanism in the present invention;

[0031] Figure 9 3D structure diagram of the tilting threaded rod and the tilting rotating rod in the present invention.

[0032] In the figure: 1. Screening mechanism; 101. Screening box; 102. First support disk; 103. Second support disk; 104. Rotating bearing; 105. Crushing drum; 106. First crushing protrusion; 107. Rotating motor; 108. Driving bevel gear; 109. Meshing bevel gear disk; 110. Driven bevel gear; 111. Cleaning conveyor motor; 112. Conveyor roller; 113. Spiral blade; 114. Support sleeve; 115. Telescopic chute; 116. Telescopic spring; 117. Spring damper; 118. Telescopic baffle; 119. Telescopic sliding rod; 120. Cleaning brush; 121. Collection tank; 122. Second crushing protrusion; 123. Connecting block; 124. First spring connecting piece; 125. Vibration spring; 126. Spring telescopic rod; 127. Second spring connecting piece; 128. Feeding trough; 129. Discharge cover; 130. Fixed bolt; 2. Tilting mechanism; 201. Tilting base; 202. Tilting chute; 203. Motor protection cover; 204. Tilting motor; 205. Sprocket drive assembly; 206. Tilting threaded rod; 207. Tilting threaded sleeve; 208. Tilting rotating rod; 209. Rotating support; 210. Support frame; 211. Placing groove; 212. Support limit block; 213. Connecting hinge. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Please refer to Figure 1-9, the present invention provides a technical solution: a multi-stage coal gangue screening device, including a screening mechanism 1, and a cleaning and conveying motor 111 installed on one side of the screening mechanism 1. An inclination mechanism 2 is provided at the bottom of the screening mechanism 1, and an inclination motor 204 is provided on one side of the bottom of the inclination mechanism 2. The screening mechanism 1 includes a screening box 101. A first support disk 102 is fixedly installed on one side of the screening box 101, and a second support disk 103 is fixedly installed at one end of the screening box 101 away from the first support disk 102. Among them, rotating bearings 104 are rotatably connected inside both the first support disk 102 and the second support disk 103, and a crushing drum 105 is fixedly installed between the two rotating bearings 104. Among them, a number of first crushing protrusions 106 are fixedly installed inside the crushing drum 105. A rotating motor 107 is fixedly installed on one side inside the first support disk 102. The output end of the rotating motor 107 is fixedly connected to a driving bevel gear 108. A meshing bevel gear disk 109 is meshed and connected to one side of the driving bevel gear 108. A number of driven bevel gears 110 are meshed and connected to the outside of the meshing bevel gear disk 109. The meshing bevel gear disk 109 is fixedly connected to the rotating bearing 104. The cleaning and conveying motor 111 is fixedly installed on the outside of the first support disk 102. By setting the screening mechanism 1, the rotating motor 107 can be used to drive the driving bevel gear 108 to rotate. By using the meshing action among the driving bevel gear 108, the meshing bevel gear disk 109 and the driven bevel gears 110, the rotation of the rotating bearing 104 and the crushing drum 105 is realized. Through the collision between the first crushing protrusions 106 inside the crushing drum 105 and the coal gangue, the coal gangue and coal are broken. Since the hardness of the coal gangue is greater than that of the coal, the coal is crushed through the collision between the first crushing protrusions 106 and the coal gangue, realizing the separation of the coal and the coal gangue. The crushed coal will adhere to the inner wall of the crushing drum 105 and move to the top of the crushing drum 105 as the crushing drum 105 rotates.

[0035] The output end of the cleaning conveyor motor 111 is fixedly connected to a conveyor roller 112. The conveyor roller 112 is rotatably connected to the second support disk 103. A spiral blade 113 is fixedly installed on the outer side of the conveyor roller 112. A number of support sleeves 114 are fixedly installed on the outer side of the spiral blade 113. The number of support sleeves 114 is arranged at equal intervals. An expansion chute 115 is provided inside the support sleeve 114. An expansion spring 116 is arranged inside the expansion chute 115. A spring damper 117 is arranged inside the expansion spring 116. The end of the spring damper 117 is fixedly connected to an expansion baffle 118. An expansion sliding rod 119 is fixedly connected to the outer side of the expansion baffle 118. The end of the expansion sliding rod 119 is fixedly connected to a cleaning brush 120. The lengths of the expansion sliding rods 119 on the outer sides of the number of support sleeves 114 are arranged in an increasing manner. A collection trough 121 is arranged inside the screening box 101 near the bottom of the spiral blade 113. A number of second crushing protrusions 122 are fixedly installed at the bottom of the collection trough 121. Connecting blocks 123 are symmetrically installed on both sides of the top of the collection trough 121. A first spring connecting piece 124 is fixedly connected to the bottom of the connecting block 123. A vibration spring 125 is fixedly connected to the bottom of the first spring connecting piece 124. A spring telescopic rod 126 is arranged inside the vibration spring 125. A second spring connecting piece 127 is fixedly installed at the bottom of the spring telescopic rod 126. The two second spring connecting pieces 127 are respectively fixedly connected to the first support disk 102 and the second support disk 103. A material guiding groove 128 is fixedly installed on the outer side of the second support disk 103. A discharge cover 129 is rotatably connected to the bottom of the second support disk 103 near the material guiding groove 128. A fixing bolt 130 is threadedly connected to one side inside the discharge cover 129. The cleaning conveyor motor 111 is used to drive the conveyor roller 112 and the spiral blade 113 to rotate. By the elastic force of the expansion spring 116, the cleaning brush 120 is made to fit against the inner wall of the crushing roller 105, so as to sweep down the coal particles adhering to the inner wall of the crushing roller 105, and thus fall onto the surface of the collection trough 121. The coal is discharged through the material guiding groove 128 by the spiral blade 113, so as to realize the screening function of coal and coal gangue. At the same time, due to the different lengths of the expansion sliding rods 119 on the outer side of the spiral blade 113, when the spiral blade 113 rotates, it will strike the collection trough 121. By the elastic force of the vibration spring 125, the reciprocating vibration of the collection trough 121 is realized. The second crushing protrusions 122 at the bottom of the collection trough 121 are used to further strike the coal gangue, so as to improve the screening effect of the coal gangue.

[0036] The tilting mechanism 2 includes a tilting base 201. A tilting chute 202 is formed at the top of the tilting base 201. A motor protection cover 203 is fixedly installed on one side at the bottom of the tilting base 201. A tilting motor 204 is fixedly installed on the inner side of the motor protection cover 203. The output end of the tilting motor 204 is fixedly connected to a sprocket transmission assembly 205. The sprocket transmission assembly 205 is symmetrically connected to tilting threaded rods 206 on one side. Tilting threaded sleeves 207 are threadedly connected to the outer sides of the tilting threaded rods 206. The top of the tilting threaded sleeve 207 is rotatably connected to a tilting rotating rod 208. The end of the tilting rotating rod 208 is rotatably connected to a rotating support 209. The tops of the two rotating supports 209 are fixedly installed with a support frame 210. A placement groove 211 is formed in the inner side at the top of the support frame 210. Support limit blocks 212 are symmetrically installed on one side at the top of the tilting base 201. Connecting hinges 213 are symmetrically installed on the side of the tilting base 201 away from the support limit blocks 212. The tilting base 201 is rotatably connected to the support frame 210 through the connecting hinges 213. By setting the tilting mechanism 2, the tilting motor 204 can drive the sprocket transmission assembly 205 and the tilting threaded rods 206 to rotate, causing the tilting threaded sleeves 207 to move on the tilting threaded rods 206 and driving the tilting rotating rods 208 to rotate. Under the action of the connecting hinges 213, the support frame 210 is tilted by a certain angle, which can not only realize the dumping of the screened coal gangue, but also facilitate the pouring of the unscreened coal gangue into the interior of the crushing drum 105 through the discharge cover 129 for the crushing and screening of the coal gangue.

[0037] Working principle: Before using this multi-stage coal gangue screening device, it is necessary to first check the overall condition of the device to ensure that it can work properly. According to Figure 1 - Figure 9As shown in the figure, first, start the tilting motor 204 to drive the sprocket transmission assembly 205 and the tilting threaded rod 206 to rotate, so that the tilting threaded sleeve 207 moves on the tilting threaded rod 206 and drives the tilting rotating rod 208 to rotate. Under the action of the connecting hinge 213, the support frame 210 tilts towards one side of the motor protective cover 203. By loosening the fixing bolt 130 and rotating the discharge cover 129, the coal gangue can be poured into the inside of the crushing drum 105, and then close the discharge cover 129. Secondly, start the rotating motor 107 to drive the driving bevel gear 108 to rotate. By using the meshing action between the driving bevel gear 108, the meshing bevel gear disc 109 and the driven bevel gear 110, the rotation of the rotating bearing 104 and the crushing drum 105 is realized. The coal gangue and coal are broken by the collision between the first crushing protrusions 106 inside the crushing drum 105 and the coal gangue. Since the hardness of the coal gangue is greater than that of the coal, the coal is crushed by the collision between the first crushing protrusions 106 and the coal gangue, realizing the separation of the coal and the coal gangue. The crushed coal will adhere to the inner wall of the crushing drum 105 and move to the top of the crushing drum 105 as the crushing drum 105 rotates. At the same time, start the cleaning conveyor motor 111 to drive the conveyor roller 112 and the spiral blade 113 to rotate. By using the elastic force of the telescopic spring 116, the cleaning brush 120 is attached to the inner wall of the crushing drum 105, so as to sweep the coal particles adhering to the inner wall of the crushing drum 105, and then fall onto the surface of the collection tank 121. The coal is discharged through the guide chute 128 by the spiral blade 113, thus realizing the screening function of the coal and the coal gangue. At the same time, since the lengths of the telescopic sliding rods 119 outside the spiral blade 113 are different, when the spiral blade 113 rotates, it will knock on the collection tank 121. By using the elastic force of the vibration spring 125, the reciprocating vibration of the collection tank 121 is realized. The coal gangue is further knocked by the second crushing protrusions 122 at the bottom of the collection tank 121, so as to improve the screening effect of the coal gangue. Finally, when there are no uncrushed coal particles discharged from the guide chute 128, it means that the coal gangue and the coal are completely crushed and separated. At this time, open the discharge cover 129 and start the tilting motor 204 to drive the sprocket transmission assembly 205 and the tilting threaded rod 206 to rotate, so that the tilting threaded sleeve 207 moves on the tilting threaded rod 206 and drives the tilting rotating rod 208 to rotate. Under the action of the connecting hinge 213, the support frame 210 tilts towards the side away from the motor protective cover 203, and the coal gangue can be discharged from the inside of the crushing drum 105.

[0038] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A multi-stage gangue screening device, comprising a screening mechanism and a cleaning conveying motor installed on one side of the screening mechanism; The bottom of the screening mechanism is provided with a tilting mechanism, and one side of the bottom of the tilting mechanism is provided with a tilting motor; It is characterized in that The screening mechanism comprises a screening box, a first support plate is fixedly mounted on one side of the screening box, and a second support plate is fixedly mounted on one end of the screening box away from the first support plate; The first support plate and the second support plate are both rotatably connected with a rotating bearing inside, and a crushing drum is fixedly installed between the two rotating bearings; Among them, a plurality of first crushing protrusions are fixedly installed inside the crushing drum, and a rotating motor is fixedly installed on one side inside the first supporting plate; The output end of the rotating motor is fixedly connected to a driving bevel gear, one side of the driving bevel gear is meshedly connected to a meshing bevel gear plate, the outer side of the meshing bevel gear plate is meshedly connected to a plurality of driven bevel gears, the meshing bevel gear plate is fixedly connected to a rotating bearing, and the cleaning conveying motor is fixedly mounted on the outer side of the first supporting plate; The output end of the cleaning conveying motor is fixedly connected with a conveying roller, the conveying roller is rotatably connected with the second supporting plate, a spiral blade is fixedly installed on the outer side of the conveying roller, a plurality of supporting sleeves are fixedly installed on the outer side of the spiral blade, the plurality of supporting sleeves are arranged at equal distances, and a telescopic slide groove is opened inside the supporting sleeve; A telescopic spring is arranged inside the telescopic slide groove, a spring damper is arranged inside the telescopic spring, a telescopic baffle is fixedly connected to the end of the spring damper, a telescopic sliding rod is fixedly connected to the outside of the telescopic baffle, a cleaning brush is fixedly connected to the end of the telescopic sliding rod, and the lengths of the telescopic sliding rods outside the supporting sleeves are arranged in increasing order; A collecting trough is provided inside the screening box near the bottom of the spiral blade, a plurality of second crushing protrusions are fixedly installed on the bottom of the collecting trough, connecting blocks are symmetrically installed on both sides of the top of the collecting trough, a first spring connecting piece is fixedly connected to the bottom of the connecting block, a vibration spring is fixedly connected to the bottom of the first spring connecting piece, a spring telescopic rod is provided inside the vibration spring, a second spring connecting piece is fixedly installed on the bottom of the spring telescopic rod, and the two second spring connecting pieces are fixedly connected to the first support plate and the second support plate, respectively.

2. A multi-stage gangue screening device according to claim 1, characterized in that: A material guide trough is fixedly installed on the outer side of the second support plate, and a discharge cover is rotatably connected to the bottom of the second support plate near the material guide trough, and a fixing bolt is threadedly connected to one side of the inner side of the discharge cover.

3. The multi-stage gangue screening device according to claim 1, characterized in that: The tilting mechanism includes a tilting base, a tilting slot is provided on the top of the tilting base, a motor protection cover is fixedly installed on one side of the bottom of the tilting base, the tilting motor is fixedly installed on one side inside the motor protection cover, and a sprocket transmission assembly is fixedly connected to the output end of the tilting motor.

4. A multi-stage gangue screening device according to claim 3, characterized in that: One side of the sprocket transmission assembly is symmetrically connected with an inclined threaded rod, the outer side of the inclined threaded rod is threadedly connected with an inclined threaded sleeve, the top of the inclined threaded sleeve is rotatably connected with an inclined rotating rod, and the end of the inclined rotating rod is rotatably connected with a rotating support.

5. A multi-stage gangue screening device according to claim 4, characterized in that: A support frame is fixedly installed on the top of the two rotating supports, a placement groove is opened on the inner side of the top of the support frame, a support limit block is symmetrically installed on one side of the top of the inclined base, and a connecting hinge is symmetrically installed on the side of the inclined base away from the support limit block, and the inclined base is rotatably connected to the support frame through the connecting hinge.

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