A vertical grinder with multiple grinding surfaces

Abstract

The application provides a vertical grinder with multiple grinding surfaces, which comprises a vertical cylindrical shell, a grinding roller and a grinding disc arranged at the bottom of the shell, and a screening discharging device arranged at the top of the shell, wherein an inner roller pressing member is arranged along the inner side of the grinding disc, an outer grinding area is arranged along the outer side of the grinding disc, an annular inner grinding area is arranged on the fixing plate near the middle part, and an outer roller pressing member is arranged along the outer side of the fixing plate. In the application, two grinding areas are additionally arranged on the inner side and the outer side of the grinding disc respectively, and the material moved to the outer side of the grinding disc and the large particle material just added at the center of the grinding disc are ground in different areas under the action of centrifugal force. The three grinding areas in the application correspond to materials in different states respectively, and the whole area of the grinding disc can be utilized, which not only accelerates the grinding efficiency, but also homogenizes the wear state of the grinding disc, avoids excessive local wear, and avoids problems such as annular groove fracture during maintenance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of powder grinding, in particular to a vertical grinding machine with multiple grinding surfaces. BACKGROUND

[0002] The vertical grinding machine is a grinding equipment integrating fine crushing, drying, powder grinding, powder selection and conveying, and is widely used in the powder grinding and superfine crushing of various solid materials in the cement, building material, electric power, metallurgy, chemical industry and non-metallic mineral industries. The core part of the vertical grinding machine is the grinding disc and the grinding roller. In operation, the motor drives the grinding disc to rotate through a vertical speed reducer, and the solid raw materials enter the center of the grinding disc from the feed inlet through the air-locked feeding device, and are thrown to the periphery of the grinding disc under the action of the centrifugal field and are crushed by repeated rolling of the grinding roller.

[0003] The grinding process of the vertical grinding machine is completed by a set of grinding devices (i.e. the grinding roller and the grinding disc). The materials are ground between the grinding roller and the grinding disc. The movement of the grinding device is driven by the rotation of the grinding disc and the corresponding grinding roller. In addition to the weight of the grinding roller, the grinding pressure mainly relies on a set of hydraulic devices to press the materials on the grinding disc. After grinding, a large amount of coarse powder exists in the materials, which is selected by a matching powder selection machine. The powder selection process is carried out by air flow selection. During the air flow process, most of the coarse powder automatically falls onto the grinding disc for re-grinding. The remaining coarse powder is selected by the powder selection machine as the finished product, which is sent to the finished product storage through the dust collection and conveying system.

[0004] In the grinding process, the main grinding surface is the contact surface between the grinding roller and the grinding disc. However, the grinding process is formed by the rotation of the grinding disc driven by the motor. Therefore, the grinding disc is always rotating at a certain speed, which causes the powder above the grinding disc to rotate with it. During the rotation process, the powder inevitably moves towards the outer edge of the grinding disc under the action of centrifugal force, so it cannot be in direct contact with the grinding surface of the grinding disc and the grinding roller, resulting in poor grinding effect. In modern industrial production, in order to achieve high efficiency and large batch powder processing, the diameter of the grinding disc is gradually increasing, and at the same time, the area of the powder scattered to the outer edge of the grinding disc under the action of centrifugal force is also increasing, causing a great waste of the usable area of the grinding disc. SUMMARY

[0005] In view of the deficiencies in the prior art, the present application provides a vertical grinding machine with multiple grinding surfaces, which solves the problem of poor grinding effect caused by the movement of the powder to the outer edge of the grinding disc under the action of centrifugal force, which makes it difficult to directly contact the grinding surface of the grinding disc and the grinding roller.

[0006] According to an embodiment of the present invention, a vertical grinding mill with multiple grinding surfaces includes a vertical cylindrical shell, a grinding roller and a grinding disc arranged at the bottom of the shell, and a screening and discharging device arranged at the top of the shell. The shell is also provided with a feed pipe extending from the side to above the grinding roller and the grinding disc, and the discharging device is also connected to a negative pressure transport device; the grinding roller and the grinding disc are both coaxially arranged with the shell, with the grinding roller located at the top, and a pressure device is also provided on the top of the grinding roller to apply downward pressure thereto, and a reduction motor is provided at the bottom of the grinding disc to drive it to rotate coaxially with the center of the shell;

[0007] The grinding disc is an annular disc structure, and an annular groove is provided on the upper surface of the grinding disc around its center. The grinding roller includes a fixed plate and a plurality of roller blocks arranged at the bottom of the fixed plate. The bottom of the roller block is exactly located in the annular groove, and the shape of the bottom of the roller block matches the inner shape of the annular groove.

[0008] An inner roller is arranged around the inner edge of the grinding disc, an outer grinding area is arranged on the outer edge of the grinding disc, and the outer grinding area is an annular structure sleeved on the outer edge of the grinding disc. An annular inner grinding area is provided near the middle of the fixed plate, and an outer roller is arranged around the outer edge of the fixed plate, so that the roller block is located between the inner grinding area and the outer roller; the inner side surface of the inner grinding area is closely adjacent to the outer side surface of the inner roller to form a grinding surface, and the outer roller is closely adjacent to the inner side surface of the outer grinding area to form a grinding surface.

[0009] Furthermore, the feed channel includes a vertical section and an inclined section, wherein the vertical section is coaxially arranged at the lower part of the shell, the bottom end of the inclined section is connected to the top end of the vertical section, and the top end of the inclined section extends obliquely from the middle of the shell to the side and passes through the side of the shell to extend to the outside.

[0010] Furthermore, the top of the vertical section of the feed channel also extends upward to just below the screening mechanism, and a funnel is provided on the top, and the size of the funnel top matches the size of the screening and discharging device.

[0011] Furthermore, the screening and discharging device includes a grading impeller, the grading impeller rotates horizontally, and the bottom surface of the grading impeller is closed and the top surface is open, so that the air flow and powder enter the grading impeller from both sides, and the qualified powder after screening leaves the outer shell from the top surface, and the unqualified large-particle powder falls downward into the funnel.

[0012] Furthermore, the pressurizing device includes a hydraulic telescopic machine arranged at the bottom of the shell, and the output end of the hydraulic telescopic machine is provided with a connecting bracket connected to the fixed plate from the side, and the pressure is transmitted to the fixed plate and the roller block through the connecting bracket.

[0013] Furthermore, the outer grinding area is arranged on the horizontal end surface of the top of the outer edge of the grinding disc, so that the outer grinding area is connected to the inner side surface of the outer edge of the annular groove of the grinding disc to form a complete annular surface.

[0014] Furthermore, the top of the outer rolling member is higher than the top of the outer grinding zone.

[0015] Furthermore, the inner roller pressing member includes a plurality of arc-shaped pressing blocks, and the arc-shaped pressing blocks are arranged around with equal intervals.

[0016] Furthermore, the arc-shaped pressure block includes a fixed part and a movable part. The fixed part is fixedly installed on the top of the center of the grinding disc and is evenly spaced along the inner edge of the grinding disc. The movable part is arranged close to the outside of the fixed part, and the movable part can slide radially along the grinding disc relative to the fixed part.

[0017] Furthermore, the fixing part is provided with a slide groove along the radial direction of the grinding disc, one end of the slide groove is connected to the outside of the fixing part, and the other end is connected to the accommodating cavity arranged inside the fixing part, a blocking block is provided inside the accommodating cavity, and a connecting rod is slidably arranged in the slide groove, one end of the connecting rod is connected to the blocking block, and the other end is fixedly connected to the movable part, and a return spring is provided between the blocking block and the accommodating cavity, and the return spring applies an elastic force to the connecting rod toward the center of the grinding disc, so that the connecting rod drives the movable part to be tightly attached to the outside of the fixing part.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The shell of the present invention is a vertically arranged cylindrical structure, and the bottom of the shell is provided with a grinding roller and a grinding disc that cooperate with each other to realize the grinding function, so that the interior of the shell is filled with ground dust. At the same time, the present invention adopts a negative pressure conveying device to make the powder inside the shell move to the screening and discharging device. The powder with qualified fineness is screened out of the shell by the screening and discharging device and transported away, while the unqualified powder falls between the grinding roller and the grinding disc for further processing, thereby realizing continuous grinding and continuously producing qualified powder products, with the advantages of high efficiency and high yield. At the same time, because the shell is sealed and the production process is fully closed, no pollution will be generated inside the factory building;

[0020] 2. In the present invention, the grinding disc is provided with an inner roller and an outer grinding zone, and the grinding roller is provided with an inner grinding zone and an outer roller, wherein the inner side surface of the inner grinding zone is in close contact with the outer side surface of the inner roller to form a grinding surface, and the outer roller is in close contact with the inner side surface of the outer grinding zone to form a grinding surface. Therefore, two additional grinding areas are provided on the inner and outer sides of the grinding disc, respectively. The material that moves to the outside of the grinding disc under the action of centrifugal force is ground again between the outer roller and the outer grinding zone; and the large particles of material that have just been added to the center of the grinding disc can also partially enter the area between the inner grinding zone and the inner roller for grinding, thereby avoiding excessive accumulation of material in the area between the roller block and the annular groove, which causes a large amount of material to be thrown to the edge by centrifugal force. The three grinding areas in the present invention correspond to materials in different states, and all areas of the grinding disc can be utilized, which not only speeds up the grinding efficiency, but also makes the wear state of the grinding disc uniform, avoiding problems such as excessive local wear and the occurrence of annular groove breakage during maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the overall structure of an embodiment of the present invention.

[0022] Figure 2 Schematic diagram of the grinding roller and grinding disc in an embodiment of the present invention.

[0023] Figure 3 1 is a top view of the grinding disc in an embodiment of the present invention.

[0024] Figure 4 Schematic diagram of the structure of the arc-shaped pressing block in an embodiment of the present invention.

[0025] In the above drawings: 1. Outer casing; 2. Grinding roller; 3. Grinding disc; 4. Classifying impeller; 5. Feed pipe; 6. Reducer motor; 7. Hydraulic telescopic machine; 21. Roller block; 22. Fixed plate; 23. Outer roller; 24. Inner grinding area; 31. Annular groove; 32. Lapping groove; 33. Outer grinding area; 34. Inner roller; 51. Vertical section; 52. Inclined section; 71. Connecting bracket; 341. Movable part; 342. Fixed part; 343. Connecting rod; 344. Stop block; 345. Spring; 511. Funnel. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0027] like Figure 1As shown, an embodiment of the present invention provides a vertical grinding mill with multiple grinding surfaces, comprising a vertical cylindrical housing 1, a grinding roller 2 and a grinding disc 3 disposed at the bottom of the housing 1, and a screening and discharging device disposed at the top of the housing 1. The housing 1 is also provided with a feed pipe 5 extending from the side to above the grinding roller 2 and the grinding disc 3. The discharging device is also connected to a negative pressure conveying device. In the present invention, the negative pressure conveying device constantly generates an upward suction force within the housing 1. Once the powder is ground to sufficiently fine particles, it can be discharged from the top of the housing 1 through the screening and discharging device along with the internal negative pressure airflow.

[0028] like Figure 2 As shown, the grinding roller 2 and grinding disc 3 are both coaxially arranged with the housing 1. The grinding roller 2 is positioned above and relatively fixed in the horizontal plane. A pressure device is also installed on the top of the grinding roller 2 to apply downward pressure. Under its own weight and the pressure provided by the pressure device, the grinding roller 2 is tightly pressed against the grinding disc 3, achieving a stable grinding effect. In a specific embodiment, the pressure device includes a hydraulic expansion joint 7 arranged at the bottom of the housing 1. The output end of the hydraulic expansion joint 7 is equipped with a connecting bracket 71 that is laterally connected to the fixed plate 22. The connecting bracket 71 transmits pressure to the fixed plate 22 and the roller pressure block 21. Simultaneously, a reduction motor 6 is installed at the bottom of the grinding disc 3 to drive it to rotate coaxially with the center of the housing 1. The output shaft of the reduction motor 6 is arranged upward and connected to the grinding disc 3. In this embodiment, the radial cross-section of the grinding disc 3 is wider at the bottom than at the top, leaving excess space at the bottom for mounting the pressure hydraulic expansion joint 7. The diameter of the grinding disc 3 is slightly smaller than the inner diameter of the housing 1 to facilitate rotation.

[0029] In a further scheme of this embodiment, the grinding disc 3 is an annular disc structure, and the upper surface of the grinding disc 3 is provided with an annular groove 31 surrounding its center. The width of the annular groove 31 is 1 / 3 to 1 / 2 of the radius of the upper surface of the grinding disc 3, which is 1 / 3 in this embodiment, and the cross-section of the annular groove 31 is arc-shaped; in the preferred scheme, a fine grinding groove 32 is further provided at the bottom of the annular groove 31. The fine grinding groove 32 is shallow in depth, and its function is to allow part of the unground powder to be stuck in the annular groove 31 and the grinding roller 2 to prevent it from escaping from the annular groove 31, thereby ensuring the grinding effect.

[0030] The grinding roller 2 includes a fixed plate 22 and a plurality of roller blocks 21 arranged at the bottom of the fixed plate 22. The bottom of the roller block 21 is exactly located in the annular groove 31, and the bottom shape of the roller block 21 matches the internal shape of the annular groove 31. In this embodiment, six roller blocks 21 are preferably used, and the six roller blocks 21 are equidistantly arranged in the annular groove 31. The bottom shape of the roller block 21 matches the internal shape of the annular groove 31, that is, the bottom is an arc, but the curvature is relatively high, so that the bottom end is in full contact with the bottom end of the arc groove to achieve a rolling effect. The outside of the fixed plate 22 is connected to the hydraulic telescopic machine 7 arranged at the bottom of the grinding disc 3 through a connecting bracket 71, which bypasses the outside of the grinding disc 3 and is connected to the hydraulic telescopic machine 7 arranged at the bottom of the grinding disc 3. Because the grinding disc 3 is arranged between the hydraulic telescopic machine 7 and the fixed plate 22, the connecting bracket 71 is wound from the outside of the grinding disc 3 to the top and connected to the fixed plate 22.

[0031] In the preferred embodiment of this invention, the feed channel comprises a vertical section 51 and an inclined section 52. The vertical section 51 is coaxially arranged at the bottom of the housing 1. The bottom end of the inclined section 52 is connected to the top end of the vertical section 51. The top end of the inclined section 52 extends obliquely from the center of the housing 1 to the side, passing through the side of the housing 1 and extending to the outside. Furthermore, the top end of the vertical section 51 of the feed channel extends upward to directly below the screening mechanism and is equipped with a funnel 511 at the top. The size of the top of the funnel 511 matches the size of the screening and discharging device.

[0032] In conjunction with this, the screening and discharging device includes a grading impeller 4, the grading impeller 4 rotates horizontally, and the bottom surface of the grading impeller 4 is closed and the top surface is open, so that the air flow and powder enter the grading impeller 4 from both sides, and the qualified powder after screening leaves the shell 1 from the top surface, and the large-particle powder that fails to be screened falls downward into the funnel 511.

[0033] In addition, this embodiment also includes an air inlet device provided on the outer shell 1, so as to cooperate with the negative pressure conveying system to balance the internal pressure. The air inlet device includes an air inlet provided on the side of the outer shell 1 and an air inlet pipe connected to the inside of the outer shell 1 through the air inlet. The air inlet is also provided with an electric heating pipe, which can dry the air and fully remove the moisture contained therein, so as to avoid introducing moisture into the powder, causing the moisture content of the powder to exceed the standard, or causing problems such as pipe blockage. Preferably, the electric heating pipes are unevenly arranged in parallel, and the electric heating pipes are vertically installed on the inner side of the top plate of the air inlet, so that the air flow rate is slower, thereby more fully removing the moisture in the air and obtaining a better drying effect.

[0034] like Figure 3As shown, as a solution in this embodiment, an inner roller 34 is provided around the inner edge of the grinding disc 3, and an outer grinding area 33 is provided on the outer edge of the grinding disc 3. The outer grinding area 33 is an annular structure that is sleeved on the outer edge of the grinding disc 3. The fixed plate 22 is provided with an annular inner grinding area 24 near the middle, and the outer roller 23 is provided around the outer edge of the fixed plate 22, so that the roller block 21 is located between the inner grinding area 24 and the outer roller 23. The inner side surface of the inner grinding area 24 and the outer side surface of the inner roller 34 are closely adjacent to form a grinding surface, and the outer roller 23 and the inner side surface of the outer grinding area 33 are closely adjacent to form a grinding surface. Specifically, the outer grinding area 33 is provided on the horizontal end surface at the top of the outer edge of the grinding disc 3, so that the outer grinding area 33 and the inner side surface of the outer edge of the annular groove 31 of the grinding disc 3 are connected to form a complete annular surface, and the top height of the outer roller 23 is higher than the top height of the outer grinding area 33. The material moved to the outside of the grinding disc 3 under the action of centrifugal force is ground again between the outer roller 23 and the outer grinding area 33; and the large particles of material just added in the center of the grinding disc 3 can also partially enter the area between the inner grinding area 24 and the inner roller 34 for grinding, so as to avoid excessive accumulation of material in the area between the roller block 21 and the annular groove 31, so that a large amount of material is thrown to the edge by centrifugal force.

[0035] Furthermore, the inner roller pressure member 34 includes a plurality of arc-shaped pressure blocks, which are arranged at equal intervals around the grinding disc 3. The arc-shaped pressure blocks include a fixed member 342 and a movable member 341. The fixed member 342 is fixedly mounted on the top of the center of the grinding disc 3 and is evenly spaced along the inner edge of the grinding disc 3. The movable member 341 is arranged close to the outside of the fixed member 342 and can slide radially relative to the fixed member 342 along the grinding disc 3. It should be noted that the fixed member 342 is fixed to the top of the inner edge of the grinding disc 3 to form an integrated structure, while not affecting the circular space in the middle of the grinding disc 3, so as to be fixedly connected to the reduction motor 6 below.

[0036] like Figure 4As shown, in this embodiment, the fixed member 342 is further provided with a chute along the radial direction of the grinding disc 3, one end of the chute is connected to the outside of the fixed member 342, and the other end is connected to the accommodating chamber set inside the fixed member 342, and a blocking block 344 is provided inside the accommodating chamber. A connecting rod 343 is slidably provided in the chute, one end of the connecting rod 343 is connected to the blocking block 344, and the other end is fixedly connected to the movable member 341. A return spring 345 is provided between the blocking block 344 and the accommodating chamber, and the return spring 345 applies an elastic force toward the center of the grinding disc 3 on the connecting rod 343, so that the connecting rod 343 drives the movable member 341 to be closely attached to the outside of the fixed member 342. Through the cooperation of the chute and the connecting rod 343, the movable member 341 can slide in the radial direction and is also subjected to the force applied by the return spring 345 and the blocking block 344. Under normal circumstances, the return spring 345 makes the movable part 341 close to the fixed part 342. When the grinding disc 3 rotates rapidly, the powder will be moved outward by the centrifugal force, making it easier to escape from between the arc-shaped pressing block and the inner grinding area 24. At the same time, the movable part 341 is also displaced outward under the action of centrifugal force, so that it can better press the powder on the inner grinding area 24, thereby grinding the powder more finely.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A vertical grinding machine with multiple grinding surfaces, characterized by: The invention comprises a vertical cylindrical shell, a grinding roller and a grinding disc arranged at the bottom of the shell, and a screening and discharging device arranged at the top of the shell. The shell is also provided with a feed pipe extending from the side to above the grinding roller and the grinding disc. The discharging device is also connected to a negative pressure transport device. The grinding roller and the grinding disc are both coaxially arranged with the shell, with the grinding roller located at the top. A pressure device is also provided on the top of the grinding roller to apply downward pressure to it. A reduction motor is provided at the bottom of the grinding disc to drive it to rotate coaxially with the center of the shell. The grinding disc is an annular disc structure, and an annular groove is provided on the upper surface of the grinding disc around its center. The grinding roller includes a fixed plate and a plurality of roller blocks arranged at the bottom of the fixed plate. The bottom of the roller block is exactly located in the annular groove, and the shape of the bottom of the roller block matches the inner shape of the annular groove. An inner roller is arranged around the inner edge of the grinding disc, an outer grinding area is arranged on the outer edge of the grinding disc, and the outer grinding area is an annular structure sleeved on the outer edge of the grinding disc. An annular inner grinding area is provided near the middle of the fixed plate, and an outer roller is arranged around the outer edge of the fixed plate, so that the roller block is located between the inner grinding area and the outer roller; the inner side surface of the inner grinding area is closely adjacent to the outer side surface of the inner roller to form a grinding surface, and the outer roller is closely adjacent to the inner side surface of the outer grinding area to form a grinding surface.

2. A vertical grinding machine with multiple grinding surfaces as claimed in claim 1, characterized in that: The feed pipe includes a vertical section and an inclined section, wherein the vertical section is coaxially arranged at the lower part of the shell, the bottom end of the inclined section is connected to the top end of the vertical section, and the top end of the inclined section extends obliquely from the middle of the shell to the side and passes through the side of the shell to extend to the outside.

3. A vertical grinding machine with multiple grinding surfaces as claimed in claim 2, characterized in that: The top of the vertical section of the feed pipe also extends upward to just below the screening mechanism, and a funnel is provided on the top. The size of the funnel top matches the size of the screening and discharging device.

4. A vertical grinding machine with multiple grinding surfaces as claimed in claim 3, characterized in that: The screening and discharging device includes a grading impeller, which rotates horizontally, has a closed bottom surface and an open top surface, so that airflow and powder enter the grading impeller from both sides, and the qualified powder after screening leaves the outer shell from the top surface, and the unqualified large-particle powder falls downward into the funnel.

5. The vertical grinding machine with multiple grinding surfaces according to claim 1, characterized in that: The pressurizing device includes a hydraulic telescopic machine arranged at the bottom of the shell. The output end of the hydraulic telescopic machine is provided with a connecting bracket connected to the fixed plate from the side, and the pressure is transmitted to the fixed plate and the roller block through the connecting bracket.

6. The vertical grinding machine with multiple grinding surfaces according to claim 1, characterized in that: The outer grinding area is arranged on the horizontal end surface of the top of the outer edge of the grinding disc, so that the outer grinding area is connected to the inner side surface of the outer edge of the annular groove of the grinding disc to form a complete annular surface.

7. A vertical grinding machine with multiple grinding surfaces as claimed in claim 6, characterized in that: The top of the outer rolling member is higher than the top of the outer grinding zone.

8. The vertical grinding machine with multiple grinding surfaces according to claim 1, wherein: The inner roller pressing member includes a plurality of arc-shaped pressing blocks, and the arc-shaped pressing blocks are arranged around at equal intervals.

9. The vertical grinding machine with multiple grinding surfaces according to claim 8, characterized in that: The arc-shaped pressing block includes a fixed part and a movable part. The fixed part is fixedly installed on the top of the center of the grinding disc and is evenly spaced along the inner edge of the grinding disc. The movable part is arranged close to the outside of the fixed part and can slide radially along the grinding disc relative to the fixed part.

10. The vertical grinding machine with multiple grinding surfaces according to claim 9, characterized in that: The fixing part is provided with a sliding groove along the radial direction of the grinding disc, one end of the sliding groove is connected to the outside of the fixing part, and the other end is connected to the accommodating cavity arranged inside the fixing part, a blocking block is provided inside the accommodating cavity, a connecting rod is slidably provided in the sliding groove, one end of the connecting rod is connected to the blocking block, and the other end is fixedly connected to the movable part, a return spring is provided between the blocking block and the accommodating cavity, and the return spring applies an elastic force toward the center of the grinding disc on the connecting rod, so that the connecting rod drives the movable part to be close to the outside of the fixing part.

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