Coal mill with distributing device

Abstract

The utility model discloses a coal mill with a distributing device, which comprises a blanking pipe, a millstone and a grinding roller device, the blanking pipe is positioned right above the millstone, at least one deflectable grinding roller device is arranged in the circumferential direction of the millstone, a distributor is arranged at the discharge end of the blanking pipe, the appearance of the distributor is in the shape of a circular truncated cone, and the discharge end of the blanking pipe is connected with the millstone. The bottom of the distributor is suspended, the distributor is fixed to the bottom of the blanking pipe, a gap for materials to pass through is formed between the outer conical surface of the distributor and the lower end face of the blanking pipe, the outer conical surface of the distributor inclines downwards and extends to the position above the grinding roller device, and a vertically-through through hole is formed in the middle of the distributor. The distributor is fixed at the bottom of the blanking pipe and is suspended, most coal briquettes can fall to the edge of the millstone along the outer conical surface of the distributor, and a small part of coal briquettes can fall to the middle of the millstone along the through hole in the middle of the distributor and cannot be accumulated in the middle of the millstone in quantity, so that the loading capacity of the millstone is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mills, in particular to a coal mill with a material dividing device. Background Art

[0002] Coal is an important raw material for large coal-consuming enterprises such as power plants and steel mills. Coal needs to be ground into powder before use to improve combustion efficiency. The current coal mill is equipped with a cone in the middle of the grinding disc, so that the coal blocks falling from the coal drop pipe can directly fall along the cone to the edge of the grinding disc to prevent excessive accumulation of coal blocks in the middle of the grinding disc. Similar to the coal mills disclosed by announcement numbers CN203140070U and CN213762070U. This design method has obvious defects. Although it can prevent coal blocks from accumulating in the middle of the grinding disc, since the cone is fixed in the middle of the grinding disc, the cone will rotate with the grinding disc. Under the action of centrifugal force, the cone may deviate, so the cone must be firmly fixed on the grinding disc, which has high requirements for installation and is inconvenient to disassemble. The cone itself has a large deadweight, which will also cause a large load on the grinding disc, and this load is always there, which will drive the grinding disc to rotate, causing a large waste of electricity. Utility Model Content

[0003] The utility model aims to solve the above problems and designs a coal mill with a material dividing device, which solves the problem of preventing coal blocks from excessively piling up in the middle of the grinding disc on the basis of reducing the load of the grinding disc.

[0004] To achieve the above-mentioned purpose, the technical solution of the utility model is a coal mill with a material distribution device, comprising a drop pipe, a grinding disc and a grinding roller device, the drop pipe is located directly above the grinding disc, at least one deflectable grinding roller device is arranged in the circumference of the grinding disc, a distributor is arranged at the discharge end of the drop pipe, the outer shape of the distributor is truncated cone, and the bottom of the distributor is suspended, the distributor is fixed at the bottom of the drop pipe, and there is a gap for material to pass through between the outer conical surface of the distributor and the lower end surface of the drop pipe, the outer conical surface of the distributor is inclined downward and extends to the top of the grinding roller device, and there is a through hole running through the upper and lower parts in the middle of the distributor.

[0005] Preferably, the interior of the distributor is hollow, and a material dropping channel connected to the through hole is formed in the middle of the distributor, and the distributor is coaxial with the grinding disc.

[0006] Preferably, a downwardly recessed conical surface is formed on the top of the distributor, and the conical surface is connected to the upper end of the material dropping channel.

[0007] Preferably, a wear-resistant layer is provided on the outer conical surface of the distributor and on the inner wall of the material dropping channel.

[0008] Preferably, a plurality of connecting rods are evenly distributed on the top end of the distributor along the circumferential direction, and the other ends of the connecting rods are welded to the inner wall of the drop tube.

[0009] Preferably, it further comprises an upper body and a lower body, wherein the lower body is located at the bottom of the upper body, the grinding disc is located in the lower body, and a gap is provided between the circumference of the grinding disc and the inner wall of the lower body for material dropping.

[0010] Preferably, a driving mechanism for driving the grinding disc to rotate is disposed at the bottom of the grinding disc, and a hydraulic mechanism for driving the grinding roller device to deflect downward is disposed on one side of the upper machine body.

[0011] Preferably, a conical baffle is provided at the bottom of the drop pipe, the distributor is located at the bottom of the baffle, and a channel for facilitating the drop of coal blocks is formed between the baffle and the outer conical surface of the distributor.

[0012] Compared with the prior art, the beneficial effects are:

[0013] In the utility model, the divider is fixed at the bottom of the drop tube and is suspended. The divider is conical. After the coal blocks fall from the drop tube, they will fall along the outer conical surface of the divider to the edge of the grinding disc, that is, above the grinding roller device. A small number of coal blocks will fall along the through hole in the middle of the divider to the middle of the grinding disc. In this way, the grinding disc rotates while the grinding roller device grinds the coal blocks. At the same time, the coal blocks in the middle of the grinding disc will gradually approach the edge of the grinding disc under the action of centrifugal force. The coal blocks will not accumulate in the middle of the grinding disc in large quantities, which can greatly reduce the load of the grinding disc. In this way, the load of the reducer that drives the grinding disc to rotate is reduced, thereby reducing the power consumption of the mill and playing a role in energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional structural schematic diagram of the coal mill in the utility model;

[0015] Figure 2 It is a schematic diagram of the structure of the drop pipe in the coal mill;

[0016] Figure 3 It is a schematic diagram of the cross-sectional structure of the drop tube in the coal mill.

[0017] In the figure, 1, upper body; 2, lower body; 3, grinding disc; 4, connecting rod; 5, grinding roller device; 6, drop pipe; 7, distributor; 701, drop channel; 8, baffle; 9, hydraulic mechanism; 10, driving mechanism; 11, carrying plate; 12, scraper device. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] like Figure 1 As shown, a preferred embodiment of the utility model proposes a coal mill with a material dividing device, which mainly includes an upper body 1, a lower body 2, a grinding disc 3, a grinding roller device 5, a drop pipe 6, a material divider 7 and other components, wherein the lower body 2 is fixed at the bottom of the upper body 1, the grinding disc 3 is installed in the lower body 2, and there are at least one, preferably three, grinding roller devices 5. The three grinding roller devices 5 are arranged on the circumference of the inner side of the upper body 1, and the three grinding roller devices 5 can be deflected downward, and three hydraulic mechanisms 9 are arranged on the outer wall of the upper body 1, and the three hydraulic mechanisms 9 correspond to the three grinding roller devices 5 one by one.

[0020] A driving mechanism 10 is arranged at the bottom of the grinding disc 3, and the driving mechanism 10 is composed of components such as a motor and a reducer. The driving mechanism 10 is used to drive the grinding disc 3 to rotate. During grinding, the grinding roller device 5 is driven downward by the hydraulic mechanism 9, and the grinding roller of the grinding roller device 5 will contact the grinding surface of the grinding disc 3. At the same time, the driving mechanism 10 drives the grinding disc 3 to rotate to grind the coal block into powder.

[0021] like Figure 1-Figure 3 As shown, it is vertically arranged on the upper body 1, and the lower end of the coal drop pipe extends to the inner side of the upper body 1. The distributor 7 is installed and fixed at the drop end (i.e., the lower end) of the coal drop pipe. The distributor 7 is formed in a truncated cone shape, and a large gap is left between the outer conical surface of the distributor 7 and the lower end surface of the drop pipe 6. The outer conical surface of the distributor 7 extends downwardly and obliquely to the top of the grinding roller device 5, so that the coal block can slide down along the conical surface of the distributor 7 to the top of the grinding roller device 5, and the bottom of the distributor 7 is suspended, leaving a large gap between it and the grinding disc 3.

[0022] The distributor 7, the grinding disc 3 and the drop pipe 6 are coaxial, so that the coal blocks entering the mill through the drop pipe will be evenly scattered along the outer cone of the distributor 7 to the circumference of the grinding disc 3. The diameter of the distributor 7 should be smaller than the diameter of the grinding disc 3 to prevent the coal blocks from falling outside the grinding disc 3.

[0023] refer to Figure 3, the top of the distributor 7 will extend to an appropriate distance inside the drop pipe 6. A through hole is formed in the middle of the distributor 7, which runs through from top to bottom, so as to form a vertical drop channel 701. At the same time, the top of the distributor 7 is recessed downward to form a conical surface, which extends to the top of the drop channel 701. A part of the coal blocks in the drop pipe will fall directly into the middle of the grinding disc 3 through the drop channel 701, and most of them will fall along the outer conical surface of the distributor 7 to the circumference of the grinding disc 3, which can improve the coal grinding efficiency of the grinding disc 3 and reduce the load in the middle part of the grinding disc 3. The grinding disc 3 does not need to be too fast to complete the coal grinding process. A small amount of coal blocks in the middle part of the grinding disc 3 will be gradually thrown to the circumference of the grinding disc 3 under the action of centrifugal force.

[0024] In order to reduce the weight of the distributor 7, the distributor 7 is hollow, which can reduce the burden of the distributor 7 on the drop tube 6. The top of the distributor 7 is connected to the bottom of the drop tube 6 through the connecting rod 4. There are multiple connecting rods 4, which are evenly distributed around the top of the distributor 7. The two ends of the connecting rod 4 are respectively welded to the outer wall of the distributor 7 and the inner wall of the drop tube 6. The gap between two adjacent connecting rods 4 is large enough so that the coal blocks fall onto the outer cone surface of the distributor 7.

[0025] A wear-resistant layer is provided on the outer conical surface of the distributor 7 and the inner wall of the material dropping channel 701 to improve the service life of the distributor 7. A conical baffle plate 8 is also welded at the lower end of the material dropping pipe 6, the distributor 7 is located at the bottom of the baffle plate 8, and a channel is formed between the baffle plate 8 and the outer conical surface of the distributor 7, through which the coal blocks can be guided to fall on the circumference of the grinding disc 3 to prevent the coal blocks from splashing around after falling directly on the distributor 7.

[0026] refer to Figure 1 A certain gap is left between the grinding disc 3 and the inner wall of the lower body 2 in the circumferential direction, so that the crushed materials on the grinding disc 3 can fall under the grinding disc 3. A carrier plate 11 is provided on the lower side of the grinding disc 3 for loading the crushed materials. A scraper device 12 is provided on the outer side of the grinding disc 3. The scraper device 12 rotates with the grinding disc 3, and the crushed materials on the carrier plate 11 are scraped out from the outlet pipe by the scraper device 12. Under the action of the high-pressure gas, the coal powder will come out from the pipeline provided on the top of the upper body 1 along with the high-pressure gas.

[0027] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the utility model. Some changes that may be made to certain parts thereof by technicians in this technical field all reflect the principles of the utility model and fall within the protection scope of the utility model.

Claims

1. A coal mill with a material distribution device, comprising a material drop pipe (6), a grinding disc (3) and a grinding roller device (5), wherein the material drop pipe (6) is located directly above the grinding disc (3), and at least one deflectable grinding roller device (5) is provided on the circumference of the grinding disc (3), characterized in that: The discharge end of the drop tube (6) is provided with a distributor (7), the outer shape of the distributor (7) is a truncated cone, and the bottom of the distributor (7) is suspended in the air. The distributor (7) is fixed to the bottom of the drop tube (6), and there is a gap between the outer conical surface of the distributor (7) and the lower end surface of the drop tube (6) for the material to pass through. The outer conical surface of the distributor (7) is inclined downward and extends to the top of the grinding roller device (5), and the middle of the distributor (7) has a through hole that passes through from top to bottom; The interior of the distributor (7) is hollow, and a material drop channel (701) connected to the through hole is formed in the middle of the distributor (7). The distributor (7) is coaxial with the grinding disc (3). A downwardly concave concave surface is formed on the top of the distributor (7), and the conical surface is connected to the upper end of the material drop channel (701); A plurality of connecting rods (4) are evenly distributed on the top end of the distributor (7) along the circumferential direction, and the other end of the connecting rod (4) is welded to the inner wall of the drop tube (6).

2. The coal mill with a material distribution device according to claim 1, characterized in that: A wear-resistant layer is provided on the outer conical surface of the distributor (7) and on the inner wall of the material dropping channel (701).

3. The coal mill with a material distribution device according to claim 1, characterized in that: It also comprises an upper body (1) and a lower body (2), wherein the lower body (2) is located at the bottom of the upper body (1), the grinding disc (3) is located inside the lower body (2), and a gap is provided between the circumference of the grinding disc (3) and the inner wall of the lower body (2) for material falling.

4. The coal mill with a material distribution device according to claim 3, characterized in that: A driving mechanism (10) for driving the grinding disc (3) to rotate is arranged at the bottom of the grinding disc (3), and a hydraulic mechanism (9) for driving the grinding roller device (5) to deflect downward is arranged on one side of the upper machine body (1).

5. The coal mill with a material distribution device according to claim 1, characterized in that: A conical baffle (8) is provided at the bottom of the drop pipe (6), the distributor (7) is located at the bottom of the baffle (8), and a channel for facilitating the drop of coal blocks is formed between the baffle (8) and the outer conical surface of the distributor (7).

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