Feeding and powder selecting device for mill

Abstract

The invention provides a feeding and powder selecting device for a mill, and relates to the technical field of feeding and powder selecting, the feeding and powder selecting device comprises a powder selecting shell connected with a coal mill body, a material scattering assembly is arranged in the powder selecting shell in a drawing and inserting mode, and the powder selecting shell is divided into a powder selecting channel and a hot air channel which communicate with each other from top to bottom through the material scattering assembly; a feeding port of the powder selecting channel and an air inlet of the hot air channel are arranged on the same side, a discharging port of the powder selecting channel and an air outlet of the hot air channel are arranged on the same side, a driving assembly is arranged at the bottom of the powder selecting shell, and the driving assembly is used for driving the scattering assembly to be inserted into the powder selecting shell or pulled out of the powder selecting shell. According to the design that the pulling-inserting type material scattering assembly is combined with the bottom driving assembly, the overhauling work of the material scattering assembly is greatly facilitated, when the material scattering assembly needs to be cleaned and overhauled, the material scattering assembly can be pulled out of the powder selecting shell through the driving assembly, operation is relatively easy and convenient, and the practicability is high. The time cost of equipment maintenance is reduced; and the labor cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of powder selection and feeding, and in particular to a powder selection device for feeding a grinding mill. Background Art

[0002] The mill is a kind of equipment specially used for grinding cement raw materials, cement clinker, slag, coal and other materials. It has the characteristics of simple structure and low manufacturing and use costs. In the existing mill grinding process, the wet materials transported from the batching station will directly enter the inner cone of the mill along the inclined feed chute, where they will be fully mixed with the return powder from the mill concentrator, and then fed to the grinding disc from the central feed pipe to start the rolling and grinding operation. In this process, the coarse particles and fine powder will be lifted by the high-speed airflow ejected by the nozzle ring, among which the coarse particles will fall back to the grinding disc for rolling and grinding again, while the rest of the materials will be carried by the airflow and continue to rise along the annular channel formed by the inner and outer cones on the upper part of the grinding disc. When these materials meet the fineness requirements, the fine powder will enter the rotor with the wind, and finally flow out from the air outlet and be collected as finished fine powder.

[0003] The Chinese patent with the publication number CN219334405U discloses a mill with a feeding powder selection function, including a mill body, characterized in that: it also includes a powder selection device arranged on the mill body, the powder selection device includes a powder selection channel, a plurality of breaking plates and a hot air channel, the powder selection channel is arranged obliquely and passes through the mill body and is connected with the inner cavity of the mill body, the plurality of breaking plates are arranged at intervals along the length direction of the inner cavity of the powder selection channel, the hot air channel is connected with the powder selection channel, the air inlet of the hot air channel is arranged on the same side as the feed inlet of the powder selection channel, the air outlet of the hot air channel is arranged on the same side as the discharge outlet of the powder selection channel, and the air inlet is connected to an external hot air source. The utility model can break up, dry and sort some wet materials with high moisture content and heavy mud wrapped with fine powder after being rolled to form dense dead cakes, reduce the wind resistance of the mill, improve the drying and sorting efficiency of the mill, and thus improve the output of the mill.

[0004] However, the scattering plate of the powder selection device is easily affected by the impact and friction of the material and causes wear during long-term use. Especially for materials with high moisture content and heavy mud content, the wear on the scattering plate may be more serious and requires regular maintenance. The setting of the scattering plate makes it difficult to maintain. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a feed powder selection device for a grinding mill, which can solve the technical problem that the breaking plate of the existing powder selection device is difficult to repair after being worn.

[0006] An embodiment of the present application provides a feeding powder selection device for a mill, comprising a powder selection shell connected to a coal mill body, a material breaking component being provided in the powder selection shell in a pull-out manner, the material breaking component dividing the powder selection shell from top to bottom into a powder selection channel and a hot air channel which are interconnected, the feed port of the powder selection channel being arranged on the same side as the air inlet of the hot air channel, the discharge port of the powder selection channel being arranged on the same side as the air outlet of the hot air channel, a driving component being provided at the bottom of the powder selection shell, the driving component being used for driving the breaking component to be inserted into or pulled out of the powder selection shell.

[0007] Furthermore, the material breaking up assembly includes a breaking up frame and a plurality of breaking up plates. The breaking up frame is inserted and withdrawn in the powder selection shell. The outer side of the breaking up frame is connected to the driving assembly. The plurality of breaking up plates are arranged on the breaking up frame in a stepped manner along the length direction of the breaking up frame.

[0008] Furthermore, the breaking plate is inserted into the breaking frame, and the breaking frame is provided with a locking component for locking the breaking plate to the breaking frame.

[0009] Furthermore, a plug-in shaft is fixedly provided at one end of the breaking up plate, and an angle adjustment plate is fixedly provided at the other end of the breaking up plate. A plug-in hole compatible with the plug-in shaft is provided on an inner side of the breaking up frame. When the breaking up plate is inserted on the breaking up frame, the plug-in shaft is inserted in the plug-in hole, and the locking assembly acts on the angle adjustment plate and fixes the breaking up plate on the breaking up frame.

[0010] Furthermore, the locking assembly includes a locking seat and a locking bolt, the bottom of the locking seat is provided with an anti-slip portion, the disassembly frame is provided with a sliding groove matched with the anti-slip portion, the anti-slip portion is slidably connected to the sliding groove, the locking seat is provided with a threaded hole, the locking bolt passes through the threaded hole and is threadedly connected to the threaded hole, and the angle adjustment plate is provided with a plurality of grooves matched with the diameter of the lower end of the locking bolt, and the plurality of grooves are evenly arranged in a ring shape.

[0011] Furthermore, a handle is provided on a side of the angle adjustment plate away from the breaking up plate.

[0012] Furthermore, the driving assembly includes a mounting seat, a hydraulic cylinder and a connecting piece. The hydraulic cylinder is fixed to the powder selection housing through the mounting seat, and the telescopic end of the hydraulic cylinder is connected to the breaking frame through the connecting piece.

[0013] Furthermore, a first sealing ring is provided at the connection between the breaking frame and the powder selection shell, and a second sealing ring is provided at the connection between the angle adjustment plate and the breaking frame.

[0014] Furthermore, the feed port of the powder selection channel is connected to an auger conveyor, and the feed port of the powder selection channel is flexibly connected to the discharge port of the auger conveyor.

[0015] Furthermore, the coal mill body is a vertical roller mill, the discharge port of the powder selection channel extends into the return cone of the coal mill body, and the air outlet of the hot air channel is connected to an induced draft duct.

[0016] Beneficial effects of the present invention:

[0017] Compared with the prior art, the present invention greatly facilitates the maintenance of the material scattering assembly through the design of the pull-out type material scattering assembly combined with the bottom driving assembly. When the material scattering assembly needs to be cleaned or repaired, the material scattering assembly can be pulled out from the powder selection shell through the driving assembly. The operation is relatively simple, which reduces the time cost and labor cost of equipment maintenance. When the equipment is operating normally, the material scattering assembly is inserted into the powder selection shell, which can ensure that the material scattering assembly is stably in the powder selection shell and functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the structure of some embodiments of the present application;

[0020] Figure 2 This is a schematic diagram of the structure of the powder selection housing in some embodiments of the present application;

[0021] Figure 3 is a cross-sectional view of a powder selection housing in some embodiments of the present application;

[0022] Figure 4 It is a schematic diagram of the structural decomposition of the material dispersing component in some embodiments of the present application;

[0023] Figure 5 It is a schematic diagram of the structure of the locking assembly in some embodiments of the present application;

[0024] The reference numerals are:

[0025] 1. Powder selection shell; 2. Material scattering assembly; 21. scattering frame; 211. Plug hole; 212. Slide; 22. scattering plate; 3. Powder selection channel; 31. Feed port; 32. Discharge port; 4. Hot air channel; 41. Air inlet; 42. Air outlet; 5. Drive assembly; 51. Mounting seat; 52. Hydraulic cylinder; 53. Connector; 6. Locking assembly; 61. Locking seat; 611. Anti-slip part; 62. Locking bolt; 7. Plug-in shaft; 8. Angle adjustment plate; 81. Groove; 82. Handle; 9. Auger conveyor; 10. Air duct. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] like Figure 1-3 As shown, the present application provides a feeding powder selection device for a mill, comprising a powder selection shell 1 connected to a coal mill body, a material scattering component 2 is provided in the powder selection shell 1 in a pull-out manner, the material scattering component 2 divides the powder selection shell 1 from top to bottom into a powder selection channel 3 and a hot air channel 4 that are interconnected, a feed port 31 of the powder selection channel 3 is arranged on the same side as an air inlet 41 of the hot air channel, a discharge port 32 of the powder selection channel 3 is arranged on the same side as an air outlet 42 of the hot air channel, a driving component 5 is provided at the bottom of the powder selection shell 1, the driving component 5 is used to drive the scattering component to be inserted into the powder selection shell 1 or to be pulled out of the powder selection shell 1, specifically, the air inlet 41 of the hot air channel 4 is externally connected to a hot air source, hot air enters the hot air channel 4 through the air inlet 41, materials enter the powder selection channel 3 from the feed port 31, the materials are scatter The material is exposed to the powder selection environment. Since the hot air channel 4 is connected with the powder selection channel 3, the material is fully contacted with the hot air flow under the action of the hot air. Under the action of the hot air flow, the dispersed material is air-dried, and the fine powder in the material is carried away by the air flow and flows out from the air outlet 42, and the coarse powder flows out from the discharge port 32 under the action of gravity and enters the coal mill body for grinding. When the material dispersing component 2 needs to be cleaned and repaired, the material dispersing component 2 can be pulled out of the powder selection shell 1 through the driving component 5. Compared with the prior art, the design of the pull-out material dispersing component 2 combined with the bottom driving component 5 greatly facilitates the maintenance of the material dispersing component 2, reduces the time cost and labor cost of equipment maintenance, and reduces the labor cost. When the equipment is operating normally, the material dispersing component 2 can ensure that the material dispersing component 2 is stably in the powder selection shell 1 and plays its role.

[0033] like Figure 2-4 As shown, the material scattering component 2 includes a scattering frame 21 and a plurality of scattering plates 22. The scattering frame 21 is inserted and withdrawn in the powder selection shell 1. The outer side of the scattering frame 21 is connected to the driving component 5, so that the material scattering component 2 can be firmly installed on the powder selection shell 1. The plurality of scattering plates 22 are arranged on the scattering frame 21 in a stepped manner along the length direction of the scattering frame 21, and the material can be scattering multiple times and step by step. When the material enters the powder selection shell 1, it will pass through the scattering plates 22 of different heights in turn. Each time it passes through a scattering plate 22, the agglomeration state of the material will be further destroyed.

[0034] like Figure 2-4 As shown, the scattering plate 22 is inserted into the scattering frame 21, and the scattering frame 21 is provided with a locking assembly 6 for locking the scattering plate 22 to the scattering frame 21, so that the installation and removal process of the scattering plate 22 becomes simple and convenient. When the scattering plate 22 is worn, deformed or damaged due to long-term use, the operator can easily remove it from the scattering frame 21 for maintenance or replacement. For example, in some high-load mill feeding and powder selection devices, the scattering plate 22 may be worn due to frequent contact with the material. Through this plug-in design, the staff can quickly replace the worn scattering plate 22, reduce the downtime of the equipment, and improve production efficiency. In addition, the scattering plate 22 can be maintained separately. When a problem occurs with an individual scattering plate 22, there is no need to perform complex disassembly of the entire material scattering assembly 2, and only the problematic one needs to be repaired. The scattering plate 22 only needs to be processed, which reduces the maintenance workload and difficulty; in the process of material scattering, the material will produce impact force and friction force on the scattering plate 22. If the scattering plate 22 is not well fixed, it may become loose or shifted, which will not only affect the effect of material scattering, but also may cause the spacing between the scattering plates 22 to change, thereby affecting the normal operation of the entire powder selection device. Through the locking component 6, it can be ensured that the scattering plate 22 always remains in the correct position during the operation, ensuring the stability of the structure of the material scattering component 2, so that the material can be scattered in the expected manner, providing a guarantee for subsequent efficient powder selection.

[0035] like Figure 4As shown, one end of the scattering plate 22 is fixedly provided with a plug-in shaft 7, and the other end of the scattering plate 22 is fixedly provided with an angle adjustment plate 8. An inner side of the scattering frame 21 is provided with a plug-in hole 211 adapted to the plug-in shaft 7. When the scattering plate 22 is inserted into the scattering frame 21, the plug-in shaft 7 is inserted into the plug-in hole 211, and the locking assembly 6 acts on the angle adjustment plate 8 to fix the scattering plate 22 on the scattering frame 21. During the material scattering process, the material will generate a large impact force and vibration force on the scattering plate 22. Through this stable connection structure, the scattering plate 22 can withstand these forces without being easily loosened or shifted, thereby ensuring the smooth progress of the material scattering work. The setting of the angle adjustment plate 8 and the locking assembly 6 are The tight assembly 6 cooperates so that the angle of the scattering plate 22 can be adjusted. This angle adjustment function can optimize the scattering effect according to different material characteristics and powder selection requirements. For example, for some materials with larger blocks and harder textures, the angle of the scattering plate 22 can be adjusted to be more inclined, so that the material can be subjected to a greater impact force when passing through the scattering plate 22, thereby more effectively scattering it; and for some materials with smaller particles or softer textures, the angle of the scattering plate 22 can be adjusted to be relatively gentle to avoid excessive scattering and ensure that the particle size of the material meets the powder selection requirements. The flexible angle adjustment capability enhances the adaptability of the device to various materials and improves the versatility of the powder selection device.

[0036] like Figure 2-5As shown, the locking assembly 6 includes a locking seat 61 and a locking bolt 62. The bottom of the locking seat 61 is provided with an anti-slip portion 611, and the scrambling frame 21 is provided with a sliding groove 212 matched with the anti-slip portion 611. The anti-slip portion 611 is slidably connected with the sliding groove 212. A threaded hole is provided on the locking seat 61, and the locking bolt 62 passes through the threaded hole and is threadedly connected with the threaded hole. The angle adjustment plate 8 is provided with a plurality of grooves 81 matched with the diameter of the lower end of the locking bolt 62. The plurality of grooves 81 are evenly arranged in an annular shape. By rotating the locking bolt 62 so that its lower end is embedded in a suitable groove 81 on the angle adjustment plate 8, the scrambling plate 22 can be firmly fixed to the scrambling frame 21. Since the size of the groove 81 is matched with the diameter of the lower end of the locking bolt 62, a tight and precise fixation can be achieved to ensure that the scrambling plate 22 does not slip during operation. The angle adjustment plate 8 is provided with a plurality of grooves 81 evenly arranged in an annular shape, which provides flexibility for the angle adjustment of the scattering plate 22. When the angle of the scattering plate 22 needs to be adjusted, the locking bolt 62 can be loosened first, and then the scattering plate 22 is rotated to the desired angle, so that the locking bolt 62 is aligned with the groove 81 at the new angle, and then the locking bolt 62 is tightened. The annular evenly distributed grooves 81 can allow the scattering plate 22 to be adjusted to a variety of angles within a certain range to adapt to the characteristics of different materials and different scattering requirements. When the scattering plate 22 needs to be replaced or repaired, it is only necessary to loosen the locking bolt 62, and then move the locking seat 61 to make the locking bolt 62 give way to the angle adjustment plate 8, and the scattering plate 22 can be easily removed from the scattering frame 21.

[0037] like Figure 4 As shown, a handle 82 is provided on the side of the angle adjustment plate 8 away from the breaking up plate 22. The setting of the handle 82 makes it more convenient to adjust the angle of the breaking up plate 22. The operator can directly hold the handle 82 to rotate the breaking up plate 22 without using other auxiliary tools or complicated operating techniques. When disassembling or installing the breaking up plate 22, the handle 82 can be used as a fulcrum. The staff can hold the handle 82 and easily pull out or insert the breaking up plate 22 from the breaking frame 21, making the process smoother. After installation, the handle 82 can also be used to check whether the breaking up plate 22 is installed in place, thereby ensuring the quality of the installation.

[0038] like Figure 2As shown, the driving assembly 5 includes a mounting seat 51, a hydraulic cylinder 52 and a connecting piece 53. The hydraulic cylinder 52 is fixed on the powder selection shell 1 through the mounting seat 51, and the telescopic end of the hydraulic cylinder 52 is connected to the scrambler 21 through the connecting piece 53. Specifically, the mounting seat 51 is fixed on the powder selection shell 1, the hydraulic cylinder 52 is fixed on the mounting seat 51, and the connecting piece 53 is fixed on the outer side of the scrambler 21. The telescopic end of the hydraulic cylinder 52 is fixedly connected to the connecting piece 53. Through the extension and retraction of the hydraulic cylinder 52, the scrambler 21 can be inserted into the powder selection shell 1 or pulled out from the powder selection shell 1, which is simple and convenient.

[0039] like Figure 2 As shown, a first sealing ring (not shown in the figure) is provided at the connection between the breaking frame 21 and the powder selection shell 1, and a second sealing ring (not shown in the figure) is provided at the connection between the angle adjustment plate 8 and the breaking frame 21. Through the setting of the first sealing ring and the second sealing ring, it is possible to effectively prevent material leakage from the connection, reduce dust concentration in the workplace, and help improve the working environment and protect the respiratory health of operators.

[0040] like Figure 1 As shown, the feed port 31 of the powder selection channel 3 is connected to the auger conveyor 9, and the feed port 31 of the powder selection channel 3 is softly connected to the discharge port 32 of the auger conveyor 9. The auger conveyor 9 can realize continuous transportation of materials. The auger conveyor 9 pushes the material forward by the rotation of the spiral blade, and stably transports the material to the feed port 31 of the powder selection channel 3. This continuous feeding method can ensure that the powder selection device has a stable material input, avoiding the interruption or instability of the powder selection process caused by untimely or uneven material supply. For example, in large-scale industrial production, a stable material supply is very important for maintaining The continuity of the entire production process is crucial, just like a continuous material conveyor belt, ensuring that the powder selection work can be carried out continuously and efficiently; the soft connection between the feed port 31 and the discharge port 32 of the auger conveyor 9 plays a role in buffering and shock absorption. During the operation of the auger conveyor 9, due to factors such as the vibration of the motor and the collision between the spiral blades and the material, certain vibrations and impact forces will be generated. The soft connection material (such as rubber hose, etc.) can absorb these vibrations and impact forces to prevent them from being directly transmitted to the powder selection channel 3, which can reduce damage and loosening of components caused by vibration and extend the service life of the equipment.

[0041] like Figure 2As shown, the coal mill body is a vertical roller mill, and the discharge port 32 of the powder selection channel 3 extends into the return cone of the coal mill body, so that the material (coarse powder) that does not meet the finished product particle size requirements is directly returned to the coal mill body for re-grinding. In the vertical roller mill, the return cone plays the role of collecting and guiding materials. By directly sending the coarse powder back to the return cone, the loss and interference of the coarse powder during the external transportation process are reduced, so that the material can efficiently enter the grinding area again, forming a good material circulation system, thereby improving the material reuse efficiency. The air outlet 42 of the hot air channel 4 is connected to the induced draft pipe 10, and the hot air flows out of the air outlet 42 with the fine powder. The hot air after powder selection is led out of the powder selection device through the induced draft pipe 10 and discharged into the main air duct between the inner cone and the outer cone of the mill body, so that the hot air can be further recycled in the mill system, improving the thermal efficiency and material processing efficiency of the entire system.

[0042] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A feeding powder selection device for a grinding mill, characterized in that: It comprises a powder selection shell connected to the coal mill body, wherein a material scattering component is inserted and pulled inside the powder selection shell, and the material scattering component divides the powder selection shell from top to bottom into a powder selection channel and a hot air channel which are interconnected, the feed port of the powder selection channel is arranged on the same side as the air inlet of the hot air channel, the discharge port of the powder selection channel is arranged on the same side as the air outlet of the hot air channel, and a driving component is provided at the bottom of the powder selection shell, and the driving component is used to drive the scattering component to be inserted into the powder selection shell or pulled out from the powder selection shell.

2. A feeding powder selection device for a grinding mill according to claim 1, characterized in that: The material breaking up assembly includes a breaking up frame and a plurality of breaking up plates. The breaking up frame is inserted and withdrawn in the powder selection shell. The outer side of the breaking up frame is connected to the driving assembly. The plurality of breaking up plates are arranged on the breaking up frame in a stepped manner along the length direction of the breaking up frame.

3. A feeding powder selection device for a grinding mill according to claim 2, characterized in that: The disintegration plate is inserted into the disintegration frame, and the disintegration frame is provided with a locking component for locking the disintegration plate onto the disintegration frame.

4. A feeding powder selection device for a grinding mill according to claim 3, characterized in that: A plug-in shaft is fixedly provided at one end of the breaking plate, and an angle adjustment plate is fixedly provided at the other end of the breaking plate. A plug-in hole matched with the plug-in shaft is provided on an inner side of the breaking frame. When the breaking plate is inserted on the breaking frame, the plug-in shaft is inserted in the plug-in hole, and the locking assembly acts on the angle adjustment plate and fixes the breaking plate on the breaking frame.

5. A feeding powder selection device for a grinding mill according to claim 4, characterized in that: The locking assembly includes a locking seat and a locking bolt. The bottom of the locking seat is provided with an anti-slip portion. The disassembly frame is provided with a sliding groove matched with the anti-slip portion. The anti-slip portion is slidably connected to the sliding groove. The locking seat is provided with a threaded hole. The locking bolt passes through the threaded hole and is threadedly connected to the threaded hole. The angle adjustment plate is provided with a plurality of grooves matched with the diameter of the lower end of the locking bolt, and the plurality of grooves are evenly arranged in a ring shape.

6. A feeding powder selection device for a grinding mill according to claim 5, characterized in that: A handle is provided on one side of the angle adjustment plate away from the breaking up plate.

7. The feed powder selection device for a grinding mill according to claim 2, characterized in that: The driving assembly comprises a mounting seat, a hydraulic cylinder and a connecting piece. The hydraulic cylinder is fixed on the powder selection housing through the mounting seat, and the telescopic end of the hydraulic cylinder is connected to the dismantling frame through the connecting piece.

8. The feed powder selection device for a grinding mill according to claim 4, characterized in that: A first sealing ring is provided at the connection between the breaking frame and the powder selection shell, and a second sealing ring is provided at the connection between the angle adjustment plate and the breaking frame.

9. The feed powder selection device for a grinding mill according to claim 1, characterized in that: The feed port of the powder selection channel is connected to an auger conveyor, and the feed port of the powder selection channel is flexibly connected to the discharge port of the auger conveyor.

10. A feeding powder selection device for a grinding mill according to claim 9, characterized in that: The coal mill body is a vertical roller mill, the discharge port of the powder selection channel extends into the return cone of the coal mill body, and the air outlet of the hot air channel is connected to an air duct.

Images