Blade adjusting device of static separator of medium-speed coal mill

Abstract

The utility model discloses a blade adjusting device of a static separator of a medium-speed coal mill, which relates to the technical field of pulverizing and crushing equipment, and comprises a position adjusting ring and a plurality of adjusting bolts, the position adjusting ring is arranged on a cover plate of the separator, a plurality of position adjusting rods are uniformly arranged on the bottom surface of the position adjusting ring, and the adjusting bolts are arranged on the position adjusting rod. The end, away from the position adjusting ring, of each position adjusting rod is provided with a blade. Each adjusting bolt is installed on the blade shaft of the corresponding blade, and an auxiliary blade is arranged at one end of each adjusting bolt. According to the utility model, the structure is simple, the overall length of the blades and the auxiliary blades is convenient to adjust, the fineness and uniformity of pulverized coal are well adjusted, ideal pulverized coal is easier to obtain, and the efficiency of a boiler is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pulverizing and crushing equipment, in particular to a blade adjusting device for a static separator of a medium-speed coal mill. Background Art

[0002] Coal mill is an ideal large-scale grinding equipment. It is a machine that breaks coal blocks and grinds them into coal powder. It is an important auxiliary equipment of pulverized coal furnace and is currently a more commonly used coal grinding equipment in thermal power plants. Its main function is to send the raw coal in the coal hopper of the machine to the coal mill to be ground into coal powder, and then blow the coal powder into the powder exhaust fan driven by hot air through a conveyor belt, and then enter the furnace of the boiler for combustion.

[0003] Medium-speed coal mills are mainly used in thermal power plants, chemical plants or steel plants to grind raw coal into coal powder with a certain fineness requirement, complete the coal powder drying process and transport the coal powder to boilers and other equipment.

[0004] In the past, the length of the blades of the old static separator was fixed, and the structure and function of this form were simple. The wind speed between the blades could not be effectively adjusted under different working conditions and volume flow of the coal mill, making it difficult for the fineness and uniformity of the coal powder to meet the design requirements, indirectly reducing the efficiency of the boiler. Due to the simple structure of the old blades, the tangential airflow formed by the air-powder mixture was not obvious, the centrifugal separation efficiency of the pulverized coal was not high, and the function of the separator could not be fully realized.

[0005] Therefore, those skilled in the art provide a blade adjustment device for a static separator of a medium-speed coal mill to solve the problems raised in the above-mentioned background technology. Utility Model Content

[0006] The utility model provides a blade regulating device for a static separator of a medium-speed coal mill, which overcomes the above-mentioned shortcomings of the existing separator.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] The utility model discloses a blade adjustment device for a static separator of a medium-speed coal mill, comprising:

[0009] A positioning ring, the positioning ring is installed on the cover plate of the separator, a plurality of positioning rods are evenly installed on the bottom surface of the positioning ring, and a blade is installed on the end of each positioning rod away from the positioning ring;

[0010] A plurality of adjusting bolts are provided, each of which is mounted on a blade shaft corresponding to the blade, and an auxiliary blade is provided at one end of the adjusting bolt.

[0011] Furthermore, the number of the auxiliary blades is two, and they are respectively located on both sides of the corresponding blade.

[0012] Furthermore, a positioning nut is also provided on the blade shaft, and the positioning nut is threadedly connected to the adjusting bolt.

[0013] Furthermore, the end of each of the adjusting rods away from the adjusting ring is connected to one end of the adjusting bearing, and the bottom of the outer wall of the adjusting bearing is connected to the blade.

[0014] Furthermore, the positioning ring is connected to the output end of the push rod, and the push rod is arranged on the cover plate of the separator.

[0015] In the above technical scheme, the utility model provides a blade adjustment device for a static separator of a medium-speed coal mill, which has the following beneficial effects: simple structure, convenient for adjusting the overall length of the blades and auxiliary blades, good adjustment of the fineness and uniformity of the coal powder, easier to obtain ideal coal powder, and improved boiler efficiency. The adjustment bolt makes the length adjustment of each blade and auxiliary blade more uniform and accurate; the effect of forming a tangential airflow from the air-powder mixture is more obvious, and the centrifugal separation efficiency of the pulverized coal is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 A partial bottom view of a blade adjustment device for a static separator of a medium-speed coal mill provided by an embodiment of the utility model;

[0018] Figure 2 for Figure 1 A cross-sectional view of the connection structure between the middle adjusting ring and the blades;

[0019] Figure 3 A schematic diagram of the mechanism of the auxiliary blades of a blade adjustment device for a static separator of a medium-speed coal mill provided by an embodiment of the utility model;

[0020] Figure 4 for Figure 3 Side view of.

[0021] Description of reference numerals:

[0022] 1. Adjusting ring; 2. Adjusting rod; 3. Blade; 4. Adjusting bolt; 5. Blade shaft; 6. Auxiliary blade; 7. Positioning nut; 8. Adjusting bearing; 9. Push rod; 10. Cover plate. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] See also Figure 1-4 As shown;

[0025] The blade adjustment device of a static separator of a medium-speed coal mill described in the embodiment of the utility model comprises:

[0026] A positioning ring 1, the positioning ring 1 is installed on the cover plate of the separator, a plurality of positioning rods 2 are evenly installed on the bottom surface of the positioning ring 1, and a blade 3 is installed on the end of each positioning rod 2 away from the positioning ring 1;

[0027] A plurality of adjusting bolts 4 are provided, each of the adjusting bolts 4 is rotatably mounted on a blade shaft 5 corresponding to the blade 3 , and an auxiliary blade 6 is provided at one end of the adjusting bolt 4 .

[0028] During specific operation, the position of the auxiliary blade 6 is adjusted by the adjusting bolt 4 on the blade shaft 5 to realize the overall length of the auxiliary blade 6 and the blade 3, so as to change the cross-sectional area through which the coal powder passes while keeping the spacing between the blades 3 unchanged; when the volume flow rate of the coal powder is constant, the wind speed between the blades 3 is adjusted, thereby increasing the way to adjust the fineness of the coal powder, making it easier to obtain the ideal coal powder fineness.

[0029] There are two auxiliary blades 6, which are respectively located on both sides of the corresponding blade 3. The combination of two auxiliary blades 6 and one blade 3 plays a role in regulating the wind and powder guide area and wind speed.

[0030] The blade shaft 5 is also provided with a positioning nut 7, which is threadedly connected to the adjusting bolt 4. The adjusting screw 4 is positioned by the positioning nut 7 to ensure the accuracy of adjusting the length of each stationary blade.

[0031] The end of each of the adjusting rods 2 away from the adjusting ring 1 is connected to one end of the adjusting bearing 8 , and the bottom of the sleeve of the adjusting bearing 8 is connected to the blade 3 .

[0032] The adjusting bolt 4 on the blade shaft 5 is rotated counterclockwise or clockwise so that the adjusting bolt 4 is extended or shortened along the axial direction of the blade shaft 5 , thereby adjusting the overall length of the blade 3 and the auxiliary blade 6 .

[0033] The positioning ring 1 is connected to the output end of the push rod 9, and the push rod 9 is arranged on the cover plate 10 of the separator; the push rod rotating handle can adjust the extension length of the push rod 6, and the adjustment ring 1 is made to perform a circular motion through the extension and retraction of the push rod 6, thereby driving the adjustment ring 1 to rotate, so that each blade 5 is rotated and adjusted to a certain angle.

[0034] The device of the present application is used to realize a coal mill that grinds raw coal into coal powder with certain fineness requirements (the coal powder fineness R90 is generally required to be 15% to 40%), so that the air-powder mixture entering the separator forms a tangential airflow for centrifugal separation; the stationary blades impact the air-powder mixture entering the powder selection area to change the flow rate of the powder in the air-powder mixture, and the larger particles of coal powder will fall into the powder return cone due to gravity and impact force, and the qualified coal powder will enter the coal powder distributor together with the airflow, realizing the primary and secondary separation of the coal powder by the stationary blades, and the qualified coal powder is transported from the mill to the boiler furnace outside the mill through the primary air.

[0035] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A blade adjustment device for a static separator of a medium-speed coal mill, characterized in that: include: A positioning ring (1), the positioning ring (1) being mounted on a cover plate of a separator, a plurality of positioning rods (2) being evenly mounted on the bottom surface of the positioning ring (1), and a blade (3) being mounted on the end of each positioning rod (2) away from the positioning ring (1); A plurality of adjusting bolts (4), each of the adjusting bolts (4) is mounted on a blade shaft (5) corresponding to the blade (3), and an auxiliary blade (6) is provided at one end of the adjusting bolt (4).

2. The blade adjustment device for a static separator of a medium-speed coal mill according to claim 1, characterized in that: The number of the auxiliary blades (6) is two, and they are respectively located on both sides of the corresponding blade (3).

3. The blade adjustment device for a static separator of a medium-speed coal mill according to claim 1, characterized in that: The blade shaft (5) is also provided with a positioning nut (7), and the positioning nut (7) is threadedly connected to the adjusting bolt (4).

4. The blade adjustment device for a static separator of a medium-speed coal mill according to claim 1, characterized in that: The end of each adjusting rod (2) away from the adjusting ring (1) is connected to one end of an adjusting bearing (8), and the bottom of the outer wall of the adjusting bearing (8) is connected to the blade (3).

5. The blade adjustment device for a static separator of a medium-speed coal mill according to claim 1, characterized in that: The positioning ring (1) is connected to the output end of a push rod (9), and the push rod (9) is arranged on a cover plate (10) of the separator.

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