Ore feeding device and layer screening equipment

Abstract

The invention provides an ore feeding device and layer screening equipment. The ore feeding device comprises a first cover plate and a bottom frame located on one side of the first cover plate. A first opening is formed in the first cover plate and is used for ore pulp to pass through; the bottom frame is provided with a discharging port, and the discharging port is used for ore pulp to flow into a screen of the layer screening device. Orthographic projections of the discharge port and the first opening on the plane where the bottom frame is located do not coincide. According to the scheme, after flowing into the feeding device from a high position, ore pulp does not directly fall into the screen, but falls into the screen through the discharge port after being buffered by the bottom frame of the feeding device, so that the ore pulp is prevented from directly falling into the screen through the feeding device, the impact on the screen is reduced, the condition that the ore pulp blocks screen holes of the screen is improved, and the service life of the ore pulp is prolonged. The abrasion of the screen is reduced, the consumption of the screen is reduced, the layer screening efficiency of the screen is improved, the service life of the ore feeding device and the screen is prolonged, and the fault rate of the ore feeding device and the screen is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of ore grinding and selection, and in particular to an ore feeding device and a layer screening device. Background Art

[0002] In the iron ore grinding process, the laminated screen is an important production equipment used for wet screening operations to classify iron ore particles. In the production process, the laminated screen has problems such as uneven screen wear, easy blockage of the screen holes, fast wear of the feeding device, and a high proportion of fine particles in the screened product. The main reason for these problems is that the feeding device of the laminated screen cannot evenly feed the slurry to the screen. Summary of the invention

[0003] In view of this, the present invention proposes a feeding device and a layer screening equipment, which solves the problems in the existing stacked screening equipment, that is, due to the structural defects of the feeding device, the slurry cannot be evenly distributed on the screen, which in turn leads to uneven wear of the screen, easy clogging of the screen holes, fast wear of the feeding device, and a high proportion of fine-grained particles in the screened product.

[0004] On the one hand, an embodiment of the present invention provides a ore feeding device, the ore feeding device comprising: A first cover plate, wherein a first opening is provided on the first cover plate, and the first opening is used for passing the slurry; The bottom frame is located on one side of the first cover plate, and the bottom frame has a discharge port, and the discharge port is used to allow the slurry flowing into the bottom frame to flow into the screen of the layer screen device; wherein, The orthographic projections of the discharge port and the first opening on the plane where the bottom frame is located do not overlap.

[0005] In some embodiments, the bottom frame further has a buffer portion and a guide portion, the buffer portion, the guide portion and the discharge port are connected in sequence, and the buffer portion is arranged opposite to the first opening.

[0006] In some embodiments, the buffer portion includes a bottom plate and a first side plate, a second side plate, a third side plate and a fourth side plate respectively connected to the bottom plate, and the buffer portion is connected to the bottom plate of the guide portion through the first side plate; Among them, the distance between the bottom plate of the buffer part and the first opening is L1, the distance between one end of the guide part connected to the buffer part and the first opening is L2, and the distance between one end of the bottom plate of the guide part connected to the discharge port and the first opening is L3. The relationship between L1, L2 and L3 satisfies: L2<L3<L1.

[0007] In some embodiments, the ore feeding device further comprises: a plurality of guide bars arranged on the bottom plate of the guide part.

[0008] In some embodiments, the ore feeding device further comprises: a first splash-proof curtain and a second splash-proof curtain; The discharge port includes a first side plate connected to the guide portion and a second side plate arranged corresponding to the first side plate, the first splash-proof curtain is arranged on the first side plate, and the second splash-proof curtain is arranged on the second side plate.

[0009] In some embodiments, the ore feeding device further comprises: A first bracket connected to the second side plate and a second bracket connected to the fourth side plate, the first bracket and the second bracket are respectively used to connect the layer screen device.

[0010] In some embodiments, the side of the first cover plate facing the bottom frame is covered with a ceramic lining; and the inner wall of the bottom frame is covered with a ceramic lining.

[0011] In some embodiments, the ore feeding device further comprises: A second cover plate; The first cover plate is also provided with a second opening. The second cover plate is arranged opposite to the second opening and is detachably connected to the first cover plate.

[0012] In some embodiments, the ore feeding device further comprises a flange connected to the first opening.

[0013] On the other hand, an embodiment of the present invention further provides a layer screening device, which includes: a layer screening device and an ore feeding device in any of the above embodiments connected to the layer screening device.

[0014] The present invention has at least the following beneficial effects: The present invention provides a feeding device and a layer screening device. The feeding device provided by the present invention comprises: a first cover plate and a bottom frame located on one side of the first cover plate. A first opening is provided on the first cover plate, and the first opening is used to pass the ore pulp; the bottom frame has a discharge port, and the discharge port is used to flow the ore pulp into the screen of the layer screening device; the discharge port does not coincide with the orthographic projection of the first opening on the plane where the bottom frame is located. The discharge port of the feeding device provided by the present invention does not coincide with the orthographic projection of the first opening on the plane where the bottom frame of the feeding device is located. Therefore, after the ore pulp flows into the bottom frame of the feeding device from a high place through the first opening on the first cover plate of the feeding device, it does not fall directly into the screen, but is buffered by the bottom frame and then falls into the screen through the discharge port, thereby avoiding the ore pulp from falling directly into the screen through the feeding device, reducing the impact on the screen, improving the clogging of the screen holes by the ore pulp, reducing the wear of the screen, reducing the consumption of the screen, improving the layer screening efficiency of the screen, and improving the service life of the feeding device, the screen and the layer screening equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of a ore feeding device provided in the related art; Figure 2 A schematic diagram of the structure of an ore feeding device provided in an embodiment of the present invention; Figure 3a A front view of a first anti-splash curtain and a second anti-splash curtain provided by an embodiment of the present invention; Figure 3b for Figure 3a Side view of the first splash curtain and the second splash curtain.

[0017] [Description of Reference Numerals] 2: Feeding port; 3: Rear side panel; 4: Left side panel; 5: Front side panel; 6: Discharging port; 7: Bracket; 8: Right side panel; 10: first cover plate; 11: first opening; 12: first bolt hole; 20: bottom frame; 21: discharge port; 211: first side plate of the discharge port; 212: second side plate of the discharge port; 213: third side plate of the discharge port; 214: fourth side plate of the discharge port; 22: flow guide; 221: bottom plate of the flow guide; 222: flow guide strip; 23: buffer; 232: first side plate of the buffer; 233: second side plate of the buffer; 234: third side plate of the buffer; 235: fourth side plate of the buffer; 236: first bracket; 237: second bracket; 238: third bolt hole; 30: first splash-proof curtain; 40: second splash-proof curtain; 50: second cover plate; 60: flange plate; 61: fourth bolt hole. DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0019] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0020] In the iron ore grinding process, the laminated screen is an important production equipment used for wet screening operations to classify iron ore particles. In the production process, the laminated screen has problems such as easy clogging of the screen holes, uneven wear of the screen mesh, rapid wear of the ore feeding device, and a high proportion of fine particles in the screened product. The main reason for these problems is due to the structural defects of the ore feeding device of the laminated screen.

[0021] After the slurry enters the collecting box, it is distributed onto the screen of the laminated screen through pipelines and feeding devices. Figure 1 FIG. 1 shows a schematic diagram of the structure of a ore feeding device provided in the related art. Figure 1 The feeding device shown includes: a feed port 2, a frame box and a bracket 7. The frame box includes a front side plate 5, a left side plate 4, a rear side plate 3, and a right side plate 8. The ore slurry falls from high and low, enters the feeding device from the feed port 2, and flows out from the discharge port 6.

[0022] Because Figure 1 The feeding device shown has an upright flat trumpet shape. It is difficult for the slurry to spread along the trumpet mouth when it falls from a high place (for example, a position more than 1 meter away from the feeding device). As a result, the slurry distributed to the screen through the feeding device is uneven, which leads to blockage of the screen holes, uneven wear of the screen, rapid wear of the feeding device, and a high proportion of fine-grained particles in the screened product. These problems affect the screening efficiency of the laminated screen, increase the circulating load, have a great impact on production, and increase the operating cost and the probability of failure.

[0023] In view of this, in order to solve at least one of the above technical problems, an embodiment of the present invention provides a ore feeding device and a layer screening device.

[0024] The present invention is described in detail below in conjunction with embodiments and drawings.

[0025] A first aspect of an embodiment of the present invention provides a ore feeding device. Figure 2 As shown, the ore feeding device comprises: a first cover plate 10 and a bottom frame 20 located on one side of the first cover plate 10. The first cover plate 10 is provided with a first opening 11, and the first opening 11 is used to pass the ore pulp. The bottom frame 20 has a discharge port 21, and the discharge port 21 is used to pass the ore pulp flowing into the bottom frame so that the ore pulp flows into the screen of the layer screen device. Among them, the discharge port 21 and the first opening 11 are not overlapped in the plane where the bottom frame 20 is located.

[0026] The ore feeding device provided in the embodiment of the present invention can be applied to layer screening equipment, such as single layer screen, laminated layer screen, etc., which is not specifically limited here. The layer screening equipment can include a layer screening device, which can include a screen and a frame for connecting the ore feeding device.

[0027] The first cover plate 10 and the bottom frame 20 may be made of metal, for example, stainless steel or other metal materials.

[0028] In the scheme of the present invention, the discharge port 21 and the orthographic projection of the first opening 11 on the plane where the bottom frame 20 is located do not overlap. Therefore, when the ore feeding device is working, after the ore pulp flows from a high place through the first opening 11 on the first cover plate 10 of the ore feeding device into the bottom frame 20 of the ore feeding device, it does not fall directly into the screen, but is buffered by the bottom frame 20 before falling into the screen through the discharge port 21, thereby avoiding the ore pulp from falling directly into the screen through the ore feeding device, reducing the impact and wear of the ore pulp on the screen, improving the blockage of the ore pulp on the screen holes, improving the layer screening efficiency of the screen, increasing the service life of the ore feeding device and the layer screening equipment, and reducing the failure rate of the ore feeding device and the layer screening equipment.

[0029] In some examples, in order to facilitate disassembly and cleaning, the first cover plate 10 and the bottom frame 20 are detachably connected. For example, the first cover plate 10 and the bottom frame 20 can be connected by bolts or the like.

[0030] In some examples, such as Figure 2 As shown, the first cover plate 10 is provided with a plurality of first bolt holes 12 for passing bolts, and the end surface of the bottom frame 20 abutting against the first cover plate 10 has a plurality of second bolt holes for passing bolts, and the bolts are passed through the first bolt holes 12 and the second bolt holes and tightened to achieve a detachable connection between the bottom frame 20 and the first cover plate 10.

[0031] In some embodiments of the present invention, Figure 2 As shown, the bottom frame 20 further has a buffer portion 23 and a guide portion 22 . The buffer portion 23 , the guide portion 22 and the discharge port 21 are connected in sequence, and the buffer portion 23 is arranged opposite to the first opening 11 .

[0032] The ore pulp falls from a height and flows into the buffer part 23 of the bottom frame 20 of the ore feeding device through the first opening 11 of the ore feeding device. The buffer part 23 buffers the force generated by the ore pulp falling. After being buffered by the buffer part 23, the ore pulp passes through the guide part 22. The guide part 22 guides the ore pulp to make the distribution of the ore pulp more uniform. The uniformly distributed ore pulp falls onto the screen through the discharge port 21.

[0033] Therefore, the feeding device provided by the embodiment of the present invention can make the ore slurry fall onto the screen evenly, and can further reduce the impact and wear of the ore slurry on the screen, further improve the blockage of the screen holes by the ore slurry, further improve the layer screening efficiency of the screen, further improve the service life of the feeding device and the layer screening equipment, reduce the circulating load, and reduce the failure rate of the feeding device and the layer screening equipment.

[0034] In some embodiments of the present invention, Figure 2As shown, the buffer portion 23 may include a bottom plate and a first side plate 232, a second side plate 233, a third side plate 234 and a fourth side plate 235 respectively connected to the bottom plate. The buffer portion 23 is connected to the bottom plate 221 of the guide portion 22 via the first side plate 232.

[0035] Among them, the distance between the bottom plate of the buffer part 23 and the first opening 11 is L1, the distance between one end of the guide part connected to the buffer part 23 and the first opening 11 is L2, and the distance between one end of the bottom plate 221 of the guide part 22 connected to the discharge port 21 and the first opening 11 is L3. The following relationship is satisfied among L1, L2 and L3: L2<L3<L1.

[0036] The ore pulp falls from a height and flows into the buffer part 23 of the bottom frame 20 of the ore feeding device through the first opening 11 of the ore feeding device. The buffer part 23 buffers the force formed by the falling ore pulp. By making the distance L1 between the bottom plate of the buffer part 23 and the first opening 11 smaller than the distance L2 between the end of the guide part connected to the buffer part 23 and the first opening 11, the impact force of the ore pulp on other parts of the bottom frame can be further reduced. The ore pulp with further reduced impact force can be distributed more evenly when passing through the guide part 22, so that the ore pulp falls onto the screen more evenly.

[0037] Therefore, the feeding device provided by the embodiment of the present invention can make the ore slurry fall onto the screen more evenly, and can further reduce the impact and wear of the ore slurry on the screen, further improve the blockage of the screen holes by the ore slurry, further improve the layer screening efficiency of the screen, further improve the service life of the feeding device and the layer screening equipment, reduce the circulating load, and reduce the failure rate of the feeding device and the layer screening equipment.

[0038] In some examples, after the ore slurry falls from a height and flows into the buffer portion 23 of the bottom frame 20 of the ore feeding device through the first opening 11 of the ore feeding device, the bottom plate of the buffer portion 23 will reflect the ore slurry into the guide portion 22 through a reaction force. In order to make the ore slurry in the buffer portion be completely reflected to the guide portion 22, the difference ΔL (i.e., L2-L1) between the distance between the bottom plate of the buffer portion 23 and the first opening 11 and the distance between one end of the guide portion 22 connected to the buffer portion 23 and the first opening 11 can be made within a range of 150 mm to 200 mm.

[0039] In some examples, in order to improve the reliability of the ore feeding device and reduce the wear of the buffer part 23 by the ore slurry, the thickness of the buffer part 23 can be increased so that the thickness of the buffer part 23 is greater than the thickness of the guide part and the discharge port.

[0040] In some examples, in order to improve the reliability of the ore feeding device and reduce the wear of the buffer portion 23 by the ore slurry, a non-metallic lining may be added to the inside of the buffer portion 23 .

[0041] In some embodiments of the present invention, Figure 2 As shown, the ore feeding device may further include: a plurality of guide bars 222 arranged on the bottom plate 221 of the guide portion 22 .

[0042] The guide strip 222 can make the slurry fall onto the screen more evenly.

[0043] In some examples, the guide bar 222 may be made of metal, such as stainless steel, to improve the guide effect of the guide bar.

[0044] In some examples, the guide bar 222 may be connected to the bottom plate 221 of the guide portion by welding.

[0045] In some examples, the cross section of the guide bar along the X direction may be circular, rectangular, square, or the like.

[0046] In some examples, the length of the guide bar 222 is slightly smaller than the length of the bottom plate 221 of the guide portion. For example, the length of the guide bar 222 may be 90%, 80%, 70%, 60%, etc. of the length of the bottom plate 221 of the guide portion, which is not specifically limited here. By making the length of the guide bar 222 slightly smaller than the length of the bottom plate 221 of the guide portion, the guide effect of the guide bar can be improved.

[0047] In some embodiments of the present invention, Figure 3a and 3b As shown, the ore feeding device may further include: a first splash-proof curtain 30 and a second splash-proof curtain 40 .

[0048] Reference Figure 2 , 3a and 3b, the discharge port 21 includes a first side plate 211 connected to the guide portion 22 and a second side plate 212 arranged corresponding to the first side plate 211, the first splash-proof curtain 30 is arranged on the first side plate 211 of the discharge port, and the second splash-proof curtain 40 is arranged on the second side plate 212 of the discharge port.

[0049] The first anti-splash curtain 30 and the second anti-splash curtain 40 can prevent the slurry from splashing, thereby improving the cleanliness of the ore feeding device.

[0050] In some examples, the length of the first splash-proof curtain 30 along the Z direction is greater than the length of the second splash-proof curtain 40 along the Z direction. By making the length of the first splash-proof curtain 30 along the Z direction greater than the length of the second splash-proof curtain 40 along the Z direction, the flow direction of the slurry can be guided so that the slurry flows along the direction of the sun exposure surface.

[0051] In some examples, the first splash-proof curtain 30 and the second splash-proof curtain 40 are connected to the discharge port side plate in a detachable manner, for example, a bolted connection, thereby facilitating the disassembly of the first splash-proof curtain 30 and the second splash-proof curtain 40 .

[0052] In some examples, the material of the first splash-proof curtain 30 and the second splash-proof curtain 40 may be a non-metal material, such as polyurethane or the like.

[0053] In some examples, the ore feeding device may further include a first pressing plate and a second pressing plate. The first pressing plate and the first splash curtain 30 are connected to the first side plate 211 of the guide portion by bolts, thereby reducing wear on the bolts and the first splash curtain 30.

[0054] The second pressure plate and the second splash-proof curtain 40 are connected to the second side plate 212 of the guide portion by bolts, so as to reduce the wear of the bolts on the second splash-proof curtain 40 .

[0055] In some examples, the length of the first anti-splash curtain 30 along the Y direction may be greater than the length of the second anti-splash curtain 40 along the Y direction.

[0056] The discharge port may further include a third side plate 213 and a fourth side plate 214. Thus, the first splash-proof curtain 30 may extend to the third side plate 213 and the fourth side plate 214 of the discharge port, thereby further improving the splash-proof effect and the flow-guiding effect of the splash-proof curtain.

[0057] In some embodiments of the present invention, Figure 2 As shown, the ore feeding device may further include: a first bracket 236 connected to the second side plate 233 of the buffer part and a second bracket 237 connected to the fourth side plate 235 of the buffer part.

[0058] The first bracket 236 and the second bracket 237 are respectively used to connect the layer screen device.

[0059] In some examples, the first bracket 236 and the second bracket 237 are detachably connected to the layer screen device. Taking the first bracket 236 as an example, the connection between the bracket and the layer screen device is described.

[0060] The first bracket 236 may have a groove that passes through the bracket along the length direction of the bracket. A third bolt hole 238 is provided on the end of the first bracket 236 away from the buffer portion 23. When the first bracket 236 is connected to the frame of the layer screening device, the frame of the layer screening device can be inserted into the groove and abut against the end of the first bracket 236 provided with the third bolt hole 238. Bolts are passed through the third bolt hole 238 of the first bracket 236 and the bolt holes of the frame of the layer screening device in sequence, thereby connecting the first bracket 236 to the frame of the layer screening device.

[0061] In some embodiments of the present invention, Figure 2 As shown, the side of the first cover plate 10 facing the bottom frame 20 is covered with a ceramic lining; the inner wall of the bottom frame 20 is also covered with a ceramic lining.

[0062] The ceramic lining can increase the wear resistance of the ore feeding device and improve the service life of the ore feeding device.

[0063] In some examples, such as Figure 2 As shown, the side of the buffer portion 23, the guide portion 22, the discharge port 21 and the guide strip 222 of the bottom frame 20 that can directly contact the mud can be covered with a ceramic lining to improve the wear resistance and service life of the ore feeding device.

[0064] In some embodiments of the present invention, Figure 2 As shown, the ore feeding device may further include a second cover plate 50. The first cover plate 10 is also provided with a second opening (not shown), and the second cover plate 50 is arranged opposite to the second opening and is detachably connected to the first cover plate 10.

[0065] The second cover plate 50 may be made of metal, such as stainless steel or other metals. The second cover plate 50 may be connected to the first cover plate 10 by bolts, so as to facilitate the inspection and unblocking of the ore feeding device.

[0066] In some embodiments of the present invention, Figure 2 As shown, the ore feeding device may further include a flange 60 connected to the first opening 11 .

[0067] When the ore pulp falls from the ore collecting box, it flows into the first opening 11 of the ore feeding device through the rubber hose, and then falls into the bottom frame 20 of the ore feeding device. A sleeve flange can be installed at one end of the rubber hose close to the first switch, and the sleeve flange is detachably connected to the flange 60 of the ore feeding device provided on the first opening 11, which is convenient for the maintenance and unblocking of the ore feeding device, and can also improve the reliability of the connection between the rubber hose and the ore feeding device and reduce the failure rate.

[0068] like Figure 2 As shown, a fourth bolt hole 61 may be provided on the flange 60. The flange 60 of the ore feeding device may be detachably connected to the casing flange by passing bolts through the fourth bolt hole 61.

[0069] Based on the same inventive concept, according to another aspect of the present invention, an embodiment of the present invention further provides a layer screening device, which includes: a layer screening device and a ore feeding device in any of the above embodiments connected to the layer screening device.

[0070] Specifically, the layer screening device may include: a frame pulp collecting box, a feeding device and a layer screening device, the layer screening device includes a screen and a frame, the pulp collecting box is connected to the feeding device through a hose, and the feeding device is connected to the layer screening device through the frame.

[0071] When the layer screen equipment is working, the slurry falls from the slurry collection box and flows into the feeding device through the hose. After the feeding device buffers and diverts the slurry, it flows evenly onto the screen of the layer screen device. Since the slurry does not fall directly into the screen, but is buffered by the bottom frame of the feeding device before falling into the screen, the impact and wear of the slurry on the screen is reduced, the blockage of the slurry on the screen holes is improved, the layer screening efficiency of the screen is improved, the service life of the feeding device and the layer screen equipment is increased, and the failure rate of the feeding device and the layer screen equipment is reduced.

[0072] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A ore feeding device, characterized in that: include: A first cover plate, wherein a first opening is provided on the first cover plate, and the first opening is used for passing the slurry; A bottom frame located on one side of the first cover plate, the bottom frame having a discharge port, the discharge port being used to allow the slurry flowing into the bottom frame to flow into the screen of the layer screen device; wherein, The orthographic projections of the discharge port and the first opening on the plane where the bottom frame is located do not overlap.

2. The ore feeding device according to claim 1, characterized in that: The bottom frame further comprises a buffer portion and a guide portion, the buffer portion, the guide portion and the discharge port are connected in sequence, and the buffer portion is arranged opposite to the first opening.

3. The ore feeding device according to claim 2, characterized in that: The buffer part comprises a bottom plate and a first side plate, a second side plate, a third side plate and a fourth side plate respectively connected to the bottom plate, and the buffer part is connected to the bottom plate of the guide part through the first side plate; The distance between the bottom plate of the buffer portion and the first opening is L1, the distance between the end of the guide portion connected to the buffer portion and the first opening is L2, and the distance between the end of the bottom plate of the guide portion connected to the discharge port and the first opening is L3. The following relationship is satisfied among L1, L2 and L3: L2<L3<L1.

4. The ore feeding device according to claim 2, characterized in that: Also includes: A plurality of guide strips are arranged on the bottom plate of the guide portion.

5. The ore feeding device according to claim 2, characterized in that: Also includes: a first splash curtain and a second splash curtain; The discharge port includes a first side plate connected to the guide portion and a second side plate arranged corresponding to the first side plate, the first splash-proof curtain is arranged on the first side plate, and the second splash-proof curtain is arranged on the second side plate.

6. The ore feeding device according to claim 3, characterized in that: Also includes: A first bracket connected to the second side plate and a second bracket connected to the fourth side plate, wherein the first bracket and the second bracket are respectively used to connect the layer screen device.

7. The ore feeding device according to any one of claims 1 to 6, characterized in that: The side of the first cover plate facing the bottom frame is covered with a ceramic lining; The inner wall of the bottom frame is covered with ceramic lining.

8. The ore feeding device according to any one of claims 1 to 6, characterized in that: Also includes: A second cover plate; The first cover plate is also provided with a second opening, and the second cover plate is arranged opposite to the second opening and is detachably connected to the first cover plate.

9. The ore feeding device according to any one of claims 1 to 6, characterized in that: Also includes: A flange is connected to the first opening.

10. A layer screening device, characterized in that: include: A layer screen device and an ore feeding device as claimed in any one of claims 1 to 9 connected to the layer screen device.

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