CN111085322A

CN111085322A - Coal mill

Info

Publication number: CN111085322A
Application number: CN201911405293.0A
Authority: CN
Inventors: 黄淑辉
Original assignee: China Resources Power Hunan Liyujiang Co Ltd
Current assignee: China Resources Power Hunan Liyujiang Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-05-01

Abstract

The invention relates to a coal mill, which comprises a shell, wherein the upper part of the shell is provided with a coal block inlet and a coal powder outlet, one side of the coal block inlet is also provided with a hot air inlet, the middle part of the shell is provided with a maintenance door, the lower part in the shell is provided with an impact wheel assembly, and the impact wheel assembly comprises a transmission shaft and a hammering device arranged on the transmission shaft; two ends of the transmission shaft extend out of the shell, and one end of the transmission shaft is connected with the power device. The invention has the beneficial effects that: the coal grinding part is easy to change the working surface after being worn, the service life is long, the equipment is more convenient to maintain, and the service life of the equipment is long. And the produced coal powder has uniform and consistent quality.

Description

Coal mill

Technical Field

The invention relates to the technical field of crushing equipment in a thermal power plant, in particular to a coal mill.

Background

In a production plant such as a thermal power plant which supplies heat or power by burning coal, a large number of coal mills are used, which are machines for crushing and grinding coal briquettes into pulverized coal, and the existing coal mills mainly include a ball mill, a roller mill, a fan mill, and the like according to different working principles. At present, the problems that coal grinding parts are not easy to replace after being damaged, the maintenance is difficult, the structure is complex, the service life of equipment is short and the like generally exist in the coal grinding machines of the types, and the research and the development of novel coal grinding machines by technical personnel in the field are urgently needed to solve the problems.

Disclosure of Invention

The invention aims to provide a coal mill and solve the defects of the prior art.

The technical scheme for solving the technical problems is as follows: a coal mill comprises a shell, wherein a coal block inlet and a coal powder outlet are formed in the upper portion of the shell, a hot air inlet is further formed in one side of the coal block inlet, a maintenance door is formed in the middle of the shell, an impact wheel assembly is arranged on the lower portion in the shell and comprises a transmission shaft, an installation base body and a triangular hammer head, the installation base body is installed on the transmission shaft, and the triangular hammer head is arranged on the installation base body; two ends of the transmission shaft extend out of the shell, and one end of the transmission shaft is connected with the power device.

The invention has the beneficial effects that: the coal grinding part is easy to change the working surface after being worn, the service life is long, the equipment is more convenient to maintain, and the service life of the equipment is long. And the produced coal powder has uniform and consistent quality.

Further: the triangle tup is equipped with three hammering portion, and three hammering portion is 120 equipartitions, is equipped with the tup through-hole in each hammering portion.

The beneficial effects of the further scheme are as follows: three hammering portions can use by turns to can improve the life of tup greatly.

Further: the triangular hammers on the adjacent different cross sections on the mounting base body are arranged in a staggered mode and distributed in a spiral mode.

The beneficial effects of the further scheme are as follows: the coal is beaten and ground uniformly, so that the granularity of the coal powder is consistent and the quality is good.

Further: the inner wall of the shell is provided with a wear-resistant lining plate.

Further: the wear-resistant lining plate is provided with a plurality of lining plate grooves.

The beneficial effects of the further scheme are as follows: the contact area with coal can be enlarged, coal blocks are beaten and ground into coal powder, and the grinding effect is improved.

Further: and two ends of the mounting base body are provided with clamp rings, and the clamp rings are in threaded connection with the transmission shaft.

The beneficial effects of the further scheme are as follows: the position of the hammering device on the transmission shaft is convenient to adjust and fix.

Further: the circuit control device comprises a power supply, an air switch, a motor contactor, a motor starting button and a loop contactor, wherein the power supply is connected with the air switch, the motor switch is connected with the motor in series, and two ends of the motor switch are respectively connected with the air switch after the motor switch and the motor switch are connected in series; the motor contactor, the load and the thermal relay are sequentially connected in series, and after the motor contactor, the load and the thermal relay are connected in series, two ends of the motor contactor and the load are respectively connected with an air switch; the loop contactor is connected in parallel with the motor contactor.

The beneficial effects of the further scheme are as follows: the coal mill circuit control device can avoid the phenomenon of pump tripping caused by the problem of a knob.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a triangular hammer head according to the present invention;

FIG. 3 is a circuit diagram of the circuit control device of the present invention.

In the figure: 1-hot air inlet; 2-coal block inlet; 3-a coal dust outlet; 4-maintenance of the door; 5-wear-resistant lining board; 6-impact wheel assembly; 61-a drive shaft; 62-mounting a substrate; 63-hammer head; 631-a hammer; 632-hammer head through holes; 100-a housing; 201-a power supply; 202-air switch; 203-motor switch; 204-a motor contactor; 205-loop contactor; 206-motor start button; 207-load; 208-a thermal relay; 209-motor.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.

As shown in fig. 1 and 2, the coal pulverizer of the present invention includes: the coal briquette machine comprises a shell 100, wherein a coal briquette inlet 2 and a coal powder outlet 3 are arranged at the upper part of the shell 100, a hot air inlet 1 is also arranged at one side of the coal briquette inlet 2, and a maintenance door 4 is arranged in the middle of the shell 100, so that the maintenance is convenient; the lower part in the shell 100 is provided with an impact wheel assembly 6, the impact wheel assembly 6 comprises a transmission shaft 61, a mounting base 62 and a triangular hammer head 63, the mounting base 62 and the triangular hammer head 63 are mounted on the transmission shaft 61, the triangular hammer head 63 is arranged on the mounting base 62, two ends of the transmission shaft 61 extend out of the shell 100, one end of the transmission shaft is connected with a power device, and the power device adopts a conventional motor-driven speed reducer mode.

As shown in fig. 3, the coal pulverizer of the present invention further includes a circuit control device, the circuit control device includes a power supply 201, an air switch 202, a motor switch 203, a motor contactor 204, a motor 209, a motor start button 206, and a loop contactor 205, the power supply 201 is connected to the air switch 202, the motor switch 203 is connected in series with the motor 209, and both ends of the series are respectively connected to the air switch 202; the motor contactor 204, the load 207 and the thermal relay 208 are sequentially connected in series, and after the motor contactor and the load are connected in series, two ends of the motor contactor and the thermal relay are respectively connected with the air switch 202; the loop contactor 205 is connected in parallel with the motor contactor 204. The coal mill circuit control device can avoid the phenomenon of pump tripping caused by the problem of a knob.

As shown in fig. 2, the triangular hammer head 63 has three hammering portions 631, the three hammering portions 631 are uniformly distributed at 120 °, and each hammering portion 631 is provided with a hammer head through hole 632; the three hammering portions 631 can be used alternately, so that the service life of the hammer 63 can be greatly prolonged. The working surface of the triangular hammer head 63 is provided with a hard alloy wear-resistant layer, so that the service life of the hammer head 63 can be further prolonged.

On the mounting base 62, the triangular hammers 63 located on different adjacent cross sections are staggered and distributed in a spiral shape. The triangular hammers 63 are uniformly distributed on the mounting base body 62 due to the staggered arrangement, and the striking and grinding of the coal blocks are uniform, so that the granularity of the coal powder is consistent, and the quality is good.

The inner wall of the shell 100 is provided with the wear-resistant lining plate 5, the wear-resistant lining plate 5 is provided with a plurality of lining plate grooves, and the wear-resistant lining plate 5 is arranged, so that the service life of the shell 100 can be prolonged; the lining plate grooves arranged on the wear-resistant lining plate 5 can increase the contact area with coal, so that coal blocks can be beaten and ground into coal powder, and the grinding effect is improved.

The working principle of the invention is as follows: coal blocks enter the shell 100 from a coal block inlet 2, and hot air enters the coal mill from a hot air inlet 1 to dry coal particles; the power device drives the impact wheel assembly 6 to rotate at a high speed, and the coal briquette is processed into coal particles to be discharged from the coal powder outlet 3 under the impact of the triangular hammer head 63 and the grinding of the triangular hammer head 63 and the shell 100. After long-time operation, when certain hammering portion of triangle tup 63 has wearing and tearing, only need to wear to establish this triangle tup 63's round pin axle and take out, change 120 with triangle tup 63, reinsert the round pin axle, accomplish the change of hammering portion promptly to continue to use this triangle tup 63. When maintenance or overhaul is needed, the maintenance or overhaul can be conveniently carried out only by opening the maintenance door.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A coal pulverizer, characterized in that: the coal briquette machine comprises a shell (100), wherein a coal briquette inlet (2) and a coal powder outlet (3) are arranged at the upper part of the shell (100), a hot air inlet (1) is further arranged at one side of the coal briquette inlet (2), a maintenance door (4) is arranged in the middle of the shell (100), an impact wheel assembly (6) is arranged at the lower part in the shell (100), the impact wheel assembly (6) comprises a transmission shaft (61), an installation base body (62) and a triangular hammer head (63), the installation base body (62) is installed on the transmission shaft (61), and the triangular hammer head (63) is arranged on the installation base body (62); both ends of the transmission shaft (61) extend out of the shell (100), and one end of the transmission shaft (61) is connected with the power device.

2. The coal pulverizer of claim 1, wherein: triangle tup (63) are equipped with three hammering portion (631), and is three hammering portion (631) are 120 equipartitions, are equipped with tup through-hole (632) on each hammering portion (631).

3. The coal pulverizer of claim 2, wherein: the triangular hammers (63) on the adjacent different cross sections on the mounting base body (62) are arranged in a staggered mode and distributed in a spiral mode.

4. The coal pulverizer of any of claims 1 to 3, wherein: the inner wall of the shell (100) is provided with a wear-resistant lining plate (5).

5. The coal pulverizer of claim 4, wherein: and a plurality of lining plate grooves are formed in the wear-resistant lining plate (5).

6. The coal pulverizer of any of claims 1 to 3, wherein: and two ends of the mounting base body (62) are provided with clamp rings, and the clamp rings are in threaded connection with the transmission shaft (61).

7. The coal pulverizer of any of claims 1 to 3, wherein: the air switch is characterized by further comprising a circuit control device, the circuit control device comprises a power supply (201), an air switch (202), a motor switch (203), a motor contactor (204), a motor (209), a motor starting button (206) and a loop contactor (205), the power supply (201) is connected with the air switch (202), the motor switch (203) is connected with the motor (209) in series, and two ends of the motor switch (203) are respectively connected with the air switch (202) after the motor switch (203) and the motor (209) are connected in series; the motor contactor (204), the load (207) and the thermal relay (208) are sequentially connected in series, and after the motor contactor and the load are connected in series, two ends of the motor contactor and the thermal relay are respectively connected with the air switch (202); the loop contactor (205) is connected in parallel with the motor contactor (204).