Milling mechanism of medium-speed coal mill

Abstract

The invention relates to the technical field of medium-speed coal mills, in particular to a milling mechanism of a medium-speed coal mill. Comprising a frame body, a loading arm is arranged in the frame body, at least one external spring is arranged on the side wall of the frame body, and the end of a dowel bar of the external spring is connected with the upper end of the loading arm; one side of the lower end of the loading arm is rotationally mounted on the second fixing shaft, the other side of the lower end of the loading arm is rotationally connected with one end of the grinding roller shaft, and the other end of the grinding roller shaft is rotationally connected with the grinding roller; a fixed seat is arranged on the inner wall of the frame body at the lower end of the external spring, a first adjusting bolt is rotationally connected to the fixed seat, a movable seat is arranged on the grinding roller shaft, a second adjusting bolt is rotationally connected to the movable seat, and an adjusting nut is arranged between the first adjusting bolt and the second adjusting bolt. After the grinding roller and the grinding tile are abraded, the external spring exerts loading force, the loading arm rotates clockwise, but the included angle between the center face of the grinding roller and the vertical face can be kept unchanged, namely the included angle is kept unchanged. Therefore, local abrasion of the inner side of the grinding roller can be prevented, and the overall service life of the grinding roller is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of medium-speed coal mills, in particular to a grinding mechanism of a medium-speed coal mill. Background Art

[0002] In the prior art, the grinding roller rotates around the grinding roller axis, the grinding roller axis is fixedly connected to the loading arm as a whole, and the loading arm can rotate around the fixed axis.

[0003] The problems and disadvantages of this structure are: the grinding roller rotates around the fixed axis as a whole. After the grinding roller is worn, in order to ensure the gap between the grinding roller and the grinding shoe, the grinding roller needs to rotate clockwise around the fixed axis, the grinding roller's forward inclination angle increases, the inner side of the grinding roller and the grinding shoe are severely worn locally, and the service life is short. The reason for this problem is that when the coal mill is running, there is a fixed gap between the grinding roller and the grinding shoe. As the coal mill is used, the grinding roller and the grinding shoe will gradually wear, which leads to an increase in the gap. In order to ensure that the gap remains unchanged, an external spring needs to be used to apply positive pressure to the loading arm (press Figure 2 The loading force is to the right), which makes the grinding roller and the loading arm rotate around the fixed axis, but this makes the inclination angle larger, the gap between the inner side of the grinding roller and the grinding shoe smaller, the inner side of the grinding roller wears more seriously than other parts, and the overall service life of the grinding roller is reduced. Summary of the invention

[0004] In order to at least solve some problems existing in the grinding mechanism in the prior art, the present invention provides a medium-speed coal mill grinding mechanism.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a medium-speed coal mill grinding mechanism, comprising a frame, a loading arm is arranged in the frame, at least one external spring is arranged on the side wall of the frame, and the end of the force transmission rod of the external spring is connected to the upper end of the loading arm;

[0006] One side of the lower end of the loading arm is rotatably mounted on the second fixed shaft, the other side of the lower end of the loading arm is rotatably connected to one end of the grinding roller shaft, the other end of the grinding roller shaft is rotatably connected to the grinding roller, and a grinding shoe is provided at the lower end of the grinding roller;

[0007] A fixed seat is provided on the inner wall of the frame at the lower end of the external spring, and a first adjusting bolt is rotatably connected to the fixed seat. A movable seat is provided on the grinding roller shaft, and a second adjusting bolt is rotatably connected to the movable seat. An adjusting nut is provided between the first adjusting bolt and the second adjusting bolt, and the internal threads at both ends of the adjusting nut are rotated in opposite directions.

[0008] Furthermore, the grinding roller shaft is rotatably connected to the loading arm via a first movable rotating shaft, so that the grinding roller shaft can rotate up and down around the first movable rotating shaft.

[0009] Furthermore, the first adjusting bolt is rotatably connected to the fixing seat via the first fixing shaft, so that the first adjusting bolt can rotate up and down around the first fixing shaft.

[0010] Furthermore, the movable seat is rotatably connected to the second adjusting bolt via a second movable rotating shaft, so that the second adjusting bolt can rotate up and down around the second movable rotating shaft.

[0011] Furthermore, the angle between the grinding roller axis and the vertical plane is 15±1°.

[0012] Furthermore, the gap between the grinding roller and the grinding shoe is 8±5 mm.

[0013] Furthermore, the movable seat is installed on the end surface of the grinding roller shaft, and the first movable rotating shaft is installed on the side surface of the grinding roller shaft.

[0014] Advantages of the present invention:

[0015] After the grinding roller and the grinding shoe of the medium-speed coal mill grinding mechanism of the present invention are worn, the external spring applies the loading force, and the loading arm rotates clockwise, but the angle between the center plane of the grinding roller and the vertical plane can remain unchanged, that is, the angle remains unchanged. In this way, the local wear of the inner side of the grinding roller can be prevented, and the overall service life of the grinding roller can be extended.

[0016] The angle is ensured to remain unchanged through a movable four-bar linkage, which can keep the inclination angle of the grinding roller unchanged after the wear of the grinding roller decreases. The force transmission rod is the active rod, and the first adjusting bolt, the second adjusting bolt and the adjusting nut are the driven rods. The adjusting bolt and the adjusting nut form an adjusting mechanism, which can adjust the length of the swing rod and thus adjust the inclination angle of the grinding roller. The first adjusting bolt and the second adjusting bolt have opposite thread rotation directions, and the threads at both ends of the adjusting nut have opposite thread rotation directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of the medium-speed coal mill grinding mechanism provided by the present invention;

[0018] Figure 2 It is a structural schematic diagram of a grinding mechanism of a medium-speed coal mill in the prior art;

[0019] Among them: 1-external spring, 2-fixed hinge seat, 3-first fixed shaft, 4-first adjusting bolt, 5-adjusting nut, 6-second adjusting bolt, 7-second fixed shaft, 8-grinding roller shaft, 9-frame, 10-loading arm, 11-second movable rotating shaft, 12-movable seat, 13-grinding roller, 14-first movable rotating shaft, 15-grinding shoe, 16-roller shoe gap, 17-inside of grinding roller, 18-inclination angle, 19 force transmission rod. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Reference Figure 1 The present embodiment provides a medium-speed coal mill grinding mechanism, which relates to the field of medium-speed coal mills for coal powder preparation, and includes an external spring 1, a fixed seat 2, a first fixed shaft 3, a first adjusting bolt 4, an adjusting nut 5, a second adjusting bolt 6, a second fixed shaft 7, a grinding roller shaft 8, a frame 9, a loading arm 10, a second movable rotating shaft 11, a movable seat 12, a grinding roller 13, a first movable rotating shaft 14, and a grinding shoe 15;

[0022] The external spring 1 is arranged on the outer wall of the frame 9 and is bolted to the frame 9. One or two external springs 1 can be arranged depending on the loading force and the size of the space. The external spring 1 applies spring pressure to the upper end of the loading arm 10 through a force transmission rod 19 extending into the frame 9.

[0023] The lower end of the loading arm 10 is mounted on the second fixed shaft 7, and the loading arm 10 can rotate up and down around the second fixed shaft 7;

[0024] One end of the loading arm 10 away from the frame 9 is rotatably connected to one end of the grinding roller shaft 8; it is connected to the grinding roller shaft 8 through a first movable rotating shaft 14; the other end of the grinding roller shaft 8 is rotatably connected to the grinding roller 13, and a grinding shoe 15 is provided at the lower end of the grinding roller 13;

[0025] A fixed seat 2 is provided on the inner wall of the frame 9 at the lower end of the external spring 1. The fixed seat 2 is fixedly connected to the frame 9. A first adjusting bolt 4 is rotatably connected to the fixed seat 2. The first adjusting bolt 4 can rotate up and down around the fixed seat 2. A movable seat 12 is provided on the grinding roller shaft 8 obliquely below the first adjusting bolt 4. A second adjusting bolt 6 is rotatably connected to the movable seat 12.

[0026] An adjusting nut 5 is provided between the first adjusting bolt 4 and the second adjusting bolt 6. The first adjusting bolt 4 and the second adjusting bolt 6 are screwed together with the adjusting nut 5 through threads. The threads of the first adjusting bolt 4 and the second adjusting bolt 6 are screwed in opposite directions, and the internal threads at both ends of the adjusting nut 5 are screwed in opposite directions. When the adjusting nut 5 is rotated, the adjusting bolt and the adjusting bolt as a whole can be extended or compressed. The second adjusting bolt 6 is connected to the grinding roller shaft 8 through a movable seat 12. The second adjusting bolt 6 can rotate around the grinding roller shaft 8, and the movable seat 12 is fixedly connected to the grinding roller shaft 8.

[0027] In another embodiment of the present application, the grinding roller shaft 8 is rotatably connected to the loading arm 10 via the first movable rotating shaft 14 , so that the grinding roller shaft 8 can rotate up and down around the first movable rotating shaft 14 .

[0028] In another embodiment of the present application, the first adjusting bolt 4 is rotatably connected to the fixing seat 2 via the first fixing shaft 3, so that the first adjusting bolt 4 can rotate up and down around the first fixing shaft 3. In this embodiment, the fixing seat 2 is a fixed hinge seat.

[0029] In another embodiment of the present application, the movable seat 12 is rotatably connected to the second adjusting bolt 6 via the second movable rotating shaft 11, so that the second adjusting bolt 6 can rotate up and down around the second movable rotating shaft 11. In this embodiment, the movable seat 12 is a movable hinge seat.

[0030] In another embodiment of the present application, after the equipment is installed as a whole, by adjusting the position of the adjusting nut 5 and the loading arm 10, the inclination angle 18 of the grinding roller 13 to the vertical direction is 15±1°, and the roller gap 16 between the grinding roller 13 and the grinding shoe 15 is 8±5mm.

[0031] In another embodiment of the present application, the movable seat 12 is installed on the end face of the grinding roller shaft 8, the first movable rotating shaft 14 is installed on the side of the grinding roller shaft 8, the movable seat 12 is located above the movable rotating shaft 14, and there is an angle of 90° between the installation position of the movable seat 12 and the installation position of the movable rotating shaft 14.

[0032] The working principle is as follows: when the equipment is working, the gap 16 between the rollers will be filled with raw coal. Since the grinding roller 13 and the grinding shoe 15 are the working parts of the coal grinding, as the coal grinding time increases, the outer circle of the grinding roller 13 will gradually decrease, and the height of the grinding shoe 15 will gradually decrease. In order to ensure that the gap 16 between the rollers is still 8±5mm, the external spring 1 is required to apply a loading force to rotate the loading arm 10 clockwise to a certain position. Due to the existence of the connecting rod composed of the adjusting bolts (4, 6) and the adjusting nut 5, the inclination angle 18 of the grinding roller 13 will not change and will remain at 15±1°. This avoids the situation where the inner side 17 of the grinding roller is closer to the grinding shoe 15 due to the increase in the inclination angle, thereby aggravating the wear of the inner side 17 of the grinding roller, so that the grinding roller 13 is evenly worn and the service life is increased.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A medium-speed coal mill grinding mechanism, characterized in that: The invention comprises a frame (9), a loading arm (10) is arranged inside the frame (9), at least one external spring (1) is arranged on the side wall of the frame (9), and the end of the force transmission rod (19) of the external spring (1) is connected to the upper end of the loading arm (10); One side of the lower end of the loading arm (10) is rotatably mounted on the second fixed shaft (7), the other side of the lower end of the loading arm (10) is rotatably connected to one end of the grinding roller shaft (8), the other end of the grinding roller shaft (8) is rotatably connected to the grinding roller (13), and a grinding shoe (15) is provided at the lower end of the grinding roller (13); A fixed seat (2) is provided on the inner wall of the frame (9) at the lower end of the external spring (1), a first adjusting bolt (4) is rotatably connected to the fixed seat (2), a movable seat (12) is provided on the grinding roller shaft (8), a second adjusting bolt (6) is rotatably connected to the movable seat (12), an adjusting nut (5) is provided between the first adjusting bolt (4) and the second adjusting bolt (6), and the internal threads at both ends of the adjusting nut (5) are rotated in opposite directions.

2. The medium speed coal mill grinding mechanism according to claim 1, characterized in that: The grinding roller shaft (8) is rotatably connected to the loading arm (10) via a first movable rotating shaft (14), so that the grinding roller shaft (8) can rotate up and down around the first movable rotating shaft (14).

3. The medium speed coal mill grinding mechanism according to claim 1, characterized in that: The first adjusting bolt (4) is rotatably connected to the fixing seat (2) via the first fixing shaft (3), so that the first adjusting bolt (4) can rotate up and down around the first fixing shaft (3).

4. The medium speed coal mill grinding mechanism according to claim 1, characterized in that: The movable seat (12) is rotatably connected to the second adjusting bolt (6) via the second movable rotating shaft (11), so that the second adjusting bolt (6) can rotate up and down around the second movable rotating shaft (11).

5. The medium speed coal mill grinding mechanism according to claim 1, characterized in that: The angle between the grinding roller axis (8) and the vertical plane is 15±1°.

6. The medium speed coal mill grinding mechanism according to claim 1, characterized in that: The roller-shoe gap between the grinding roller and the grinding shoe (15) is 8±5 mm.

7. The medium speed coal mill grinding mechanism according to claim 1, characterized in that: The movable seat (12) is mounted on the end surface of the grinding roller shaft (8), and the first movable rotating shaft (14) is mounted on the side surface of the grinding roller shaft (8).

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