Coal mill inlet primary air volume adjusting system

Abstract

The invention belongs to the technical field of coal mills, and discloses a coal mill inlet primary air volume adjusting system which comprises a hot air pipeline, a cold air pipeline is installed at one end of the exterior of the hot air pipeline, and a first adjusting assembly is arranged on one side of the exterior of the hot air pipeline. A servo motor is started to drive a second worm to rotate, the second worm drives a second worm gear to rotate, the second worm gear drives a first connecting rod and a first convex block to rotate, and the first convex block drives a first connecting block, so that the first connecting block circularly moves along the external joint of the first convex block; meanwhile, a first connecting block pulls a second connecting block and a second protruding block to rotate circumferentially with a connecting round rod as the axis point, so that the connecting round rod is driven to rotate, the air volume is controlled through coincidence of a first blade and a second blade, in the process, through a first adjusting assembly and a second adjusting assembly, adjustment of the air volume is improved, and the practicability is high. The problems that manual adjustment is not timely, and precision is low are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mills, and in particular is a primary air volume regulating system for a coal mill inlet. Background Art

[0002] In thermal power plants, coal mills are important auxiliary equipment. Their main function is to grind raw coal into pulverized coal to meet the needs of boiler combustion. The control of the primary air volume at the coal mill inlet is crucial to the stable operation of the coal mill and the safe and efficient combustion of the boiler. It not only affects the accuracy of the air-coal ratio, but is also one of the important factors in improving the economy and stability of the combustion system.

[0003] The existing primary air volume regulation at the inlet of the coal mill is usually adjusted manually. This method has problems such as untimely adjustment and low precision, and it is difficult to meet the requirements of modern power production for automation and precise control. With the development of the power industry and the advancement of automation technology, the demand for automatic adjustment of the primary air volume at the inlet of the coal mill is becoming increasingly urgent. On the one hand, accurate control of the primary air volume at the inlet of the coal mill can ensure the coal powder transportation and drying effect in the coal mill. On the other hand, a good primary air volume adjustment system can improve the stability and efficiency of boiler combustion. At the same time, the existing primary air volume adjustment devices at the inlet of the coal mill are all fixed at the inlet, which is inconvenient to disassemble and maintain the adjustment devices, reducing the service life of the adjustment devices. Therefore, a primary air volume adjustment system for the inlet of the coal mill is proposed. Summary of the invention

[0004] In order to solve the problems raised in the above-mentioned background technology, the present invention provides a primary air volume adjustment system for a coal mill inlet, which solves the problem that the primary air volume adjustment at the coal mill inlet is usually adjusted manually, which has the problems of untimely adjustment and low precision. At the same time, the adjustment devices are fixed at the inlet, which makes it inconvenient to disassemble and maintain the adjustment devices, thereby reducing the service life of the adjustment devices.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a primary air volume regulating system at the inlet of a coal mill, comprising a hot air duct, a cold air duct is installed at one end of the outside of the hot air duct, a first regulating component is arranged on one side of the outside of the hot air duct, a protective component is installed on the other side of the outside of the hot air duct, a guide block is fixedly installed at the inner bending part of the hot air duct, a guide plate and a filter plate are distributed and installed inside the hot air duct, a diverter block is fixedly connected to the outside of the guide plate, and a second regulating component is arranged inside the protective component; The first adjustment component also includes a fixing frame arranged inside the hot air duct, a third protrusion is installed inside the fixing frame, a second blade is arranged inside the fixing frame, a first blade is installed on the top surface of the second blade, a cylinder is sleeved inside the first blade, a first worm gear is sleeved outside the cylinder, a first worm is meshed outside the first worm gear, a rotating shaft is sleeved inside the first worm, and a driving motor is installed at one end outside the rotating shaft; The second adjustment component also includes a rotating plate installed inside the hot air duct, the interior of the rotating plate is connected to a connecting round rod, the external top end of the connecting round rod is sleeved with a second protrusion, the top of the second protrusion is movably connected to a second connecting block, the outside of the second connecting block is connected to the first connecting block, the external top surface of the first connecting block is provided with a first protrusion, the interior of the first protrusion is sleeved with a first connecting rod, the outside of the first connecting rod is sleeved with a second worm gear, the outside of the second worm gear is meshed with a second worm, a servo motor is installed at one external end of the second worm, and a support seat is provided on the outside of the servo motor.

[0006] Preferably, the protection component also includes a rectangular frame installed inside the hot air duct, sliders are fixedly installed on both sides of the outside of the rectangular frame, a cover plate is fixedly connected to the outside of the rectangular frame, a shell is installed on the outside of the cover plate, adjustment blocks are arranged on both sides of the outside of the cover plate, one end of the outside of the adjustment block is connected to a second connecting rod, and slide rails are fixedly connected on both sides of the inside of the hot air duct.

[0007] Preferably, the guide plate is in an "L" shape, the outside of the guide plate contacts the inner wall of the hot air duct, and a plurality of diverter blocks are fixedly connected to the outside of the guide plate.

[0008] Preferably, the outer portion of the sliding block slides horizontally in the sliding rail, and the outer portion of the rectangular frame contacts the inner wall of the hot air duct.

[0009] Preferably, first round rods are provided at both ends of the first connecting block, and the first round rods are connected to the first protruding block and the interior of the second connecting block.

[0010] Preferably, grooves are provided on both sides of the exterior of the housing, and the adjustment block and the second connecting rod are installed in the grooves.

[0011] Preferably, a plurality of nuts and bolts are installed on the outside of the cover plate, and the plurality of nuts and bolts are connected to the inside of the housing.

[0012] Preferably, the bottom of the support seat is mounted on the outside of the rectangular frame, and the outer bottom surface of the second protrusion is in contact with the outside of the rectangular frame.

[0013] Preferably, a rectangular hole is opened on the outside of the bottom end of the hot air duct, and the rectangular frame slides horizontally in the rectangular hole.

[0014] Preferably, there are two guide plates, and the two guide plates are installed at the inner bending position of the hot air duct.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention starts a servo motor to drive the second worm to rotate, and the second worm drives the second worm wheel to rotate, and the second worm wheel drives the first connecting rod and the first protrusion to rotate, and the first protrusion drives the first connecting block to make the first connecting block move in a circular motion along the external connection of the first protrusion, and at the same time, the first connecting block pulls the second connecting block and the second protrusion to rotate in a circular motion with the connecting round rod as the axis point, thereby driving the connecting round rod to rotate, and at the same time driving the rotating plate to rotate, and the inside of the hot air duct is opened and closed through the rotation of the rotating plate, so as to control the air volume, and at the same time, the driving motor is started, and the driving motor drives the rotating shaft to rotate, and the rotating shaft drives the first worm to rotate, and at the same time, the first worm drives the first worm wheel to rotate, and the first worm wheel drives the cylinder and the first blade to rotate, so that the first blade rotates along the top surface of the second blade, and the first blade coincides with the second blade, so as to control the size of the air volume, in this process, the first adjusting component and the second adjusting component are used to improve the adjustment of the air volume, and reduce the problems of untimely manual adjustment and low precision; The present invention pulls the adjusting block to make the adjusting block rotate along the grooves provided on both sides of the outer shell, thereby taking the adjusting block out of the grooves; the outer shell and the rectangular frame are driven by pulling the adjusting block, and the rectangular frame drives the slider to slide along the inside of the slide rail to the outside, thereby taking out the rectangular frame; in this process, the adjusting block, the rectangular frame, the slider and the slide rail are used in coordination, so that the second adjusting component can be easily disassembled and taken out, thereby performing maintenance on it and improving the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention; Figure 3 It is a schematic diagram of the combined structure of the first worm wheel, the first worm, the first blade, the guide plate, the diverter block and the guide block of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the regulating component of the present invention; Figure 5 It is a schematic diagram of the combined structure of the second worm, the second turbine, the first convex block, the first connecting block, the second connecting block, the second convex block, the connecting round rod and the rotating plate of the present invention; Figure 6 It is a schematic diagram of the combined structure of the protection component and the hot air pipeline of the present invention.

[0017] In the figure: 1, hot air duct; 2, cold air duct; 3, protective component; 301, housing; 302, cover plate; 303, slide rail; 304, slider; 305, rectangular frame; 306, adjustment block; 307, second connecting rod; 4, first adjustment component; 401, driving motor; 402, rotating shaft; 403, first worm; 404, first worm wheel; 405, cylinder; 406, fixed frame; 407, third protrusion; 408 , first blade; 409, second blade; 5, guide block; 6, guide plate; 7, diverter block; 8, filter plate; 9, second adjustment assembly; 901, servo motor; 902, second worm; 903, second worm gear; 904, first connecting rod; 905, first protrusion; 906, first connecting block; 907, second connecting block; 908, second protrusion; 910, rotating plate; 911, connecting round rod; 913, support seat. DETAILED DESCRIPTION

[0018] 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.

[0019] like Figures 1 to 6 As shown, the present invention provides a primary air volume regulating system at the inlet of a coal mill, comprising a hot air duct 1, a cold air duct 2 is installed at one end of the outside of the hot air duct 1, a first regulating component 4 is arranged on one side of the outside of the hot air duct 1, a protective component 3 is installed on the other side of the outside of the hot air duct 1, a guide block 5 is fixedly installed at the inner bending part of the hot air duct 1, a guide plate 6 and a filter plate 8 are distributed and installed inside the hot air duct 1, a diverter block 7 is fixedly connected to the outside of the guide plate 6, and a second regulating component 9 is arranged inside the protective component 3; The first adjustment component 4 also includes a fixed frame 406 arranged inside the hot air duct 1, a third protrusion 407 is installed inside the fixed frame 406, a second blade 409 is arranged inside the fixed frame 406, a first blade 408 is installed on the top surface of the second blade 409, a cylinder 405 is sleeved inside the first blade 408, a first worm gear 404 is sleeved outside the cylinder 405, a first worm 403 is meshed outside the first worm gear 404, a rotating shaft 402 is sleeved inside the first worm 403, and a driving motor 401 is installed at one end outside the rotating shaft 402; The second adjustment component 9 also includes a rotating plate 910 installed inside the hot air duct 1, the interior of the rotating plate 910 is connected to a connecting round rod 911, the external top end of the connecting round rod 911 is sleeved with a second protrusion 908, the top of the second protrusion 908 is movably connected with a second connecting block 907, the outside of the second connecting block 907 is connected to the first connecting block 906, the external top surface of the first connecting block 906 is provided with a first protrusion 905, the interior of the first protrusion 905 is sleeved with a first connecting rod 904, the outside of the first connecting rod 904 is sleeved with a second worm gear 903, the outside of the second worm gear 903 is meshed with a second worm 902, a servo motor 901 is installed at one external end of the second worm 902, and a support seat 913 is provided on the outside of the servo motor 901.

[0020] The above scheme is adopted: by starting the servo motor 901 to drive the second worm 902 to rotate, the second worm 902 drives the second worm wheel 903 to rotate, and the second worm wheel 903 drives the first connecting rod 904 and the first protrusion 905 to rotate, and the first protrusion 905 drives the first connecting block 906, so that the first connecting block 906 moves in a circular motion along the external connection of the first protrusion 905, and at the same time, the first connecting block 906 pulls the second connecting block 907 and the second protrusion 908 to rotate in a circle with the connecting rod 911 as the axis point, thereby driving the connecting rod 911 to rotate, and at the same time driving the rotating plate 910 to rotate, and the inside of the hot air duct 1 is opened and closed by the rotation of the rotating plate 910, so as to control the air volume, and at the same time starting the drive motor 401, through the drive motor 401 The rotating shaft 402 is driven to rotate, and the rotating shaft 402 drives the first worm 403 to rotate, and at the same time, the first worm 403 drives the first worm wheel 404 to rotate, and the first worm wheel 404 drives the cylinder 405 and the first blade 408 to rotate, so that the first blade 408 rotates along the top surface of the second blade 409, and the first blade 408 overlaps with the second blade 409, so as to control the size of the air volume. When the equipment is finished working, the adjusting block 306 is pulled to rotate along the grooves opened on both sides of the outside of the shell 301, so as to take the adjusting block 306 out of the groove, and the shell 301 and the rectangular frame 305 are driven by pulling the adjusting block 306, and at the same time, the rectangular frame 305 drives the slider 304, so that the slider 304 slides along the inside of the slide rail 303 to the outside.

[0021] like Figure 4 and Figure 5 As shown, first round rods are provided at both ends of the interior of the first connecting block 906, and the first round rods are connected to the interior of the first protrusion 905 and the second connecting block 907; the bottom of the support seat 913 is installed on the outside of the rectangular frame 305, and the outer bottom surface of the second protrusion 908 is in contact with the outside of the rectangular frame 305.

[0022] The above scheme is adopted: first round rods are provided at both ends of the interior of the first connecting block 906, and the servo motor 901 is started to drive the second worm 902, the second worm wheel 903, and the first connecting rod 904 to rotate, and the first protrusion 905 is connected to the outside of the first connecting block 906 through the first round rod. At the same time, the first connecting block 906 and the outside of the second connecting block 907 are connected through the first round rod, so that the second connecting block 907 is pulled by the first connecting block 906, and the outer bottom surface of the second protrusion 908 contacts the outside of the rectangular frame 305. When the first connecting block 906 pulls down the second connecting block 907 and the second protrusion 908, the second connecting block 907 and the second protrusion 908 are made to move in a circle with the connecting round rod 911 as the axis point, so as to facilitate the opening and closing of the rotating plate 910. In this process, the control of the air volume is improved, and the problems of untimely manual adjustment and low precision are reduced.

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, the guide plate 6 is "L"-shaped, the outside of the guide plate 6 contacts the inner wall of the hot air duct 1, and a plurality of diversion blocks 7 are fixedly connected to the outside of the guide plate 6; there are two guide plates 6, and the two guide plates 6 are installed at the inner bend of the hot air duct 1.

[0024] The above scheme is adopted: the guide plate 6 is in an "L" shape, and the guide plate 6 is installed at the bending part inside the hot air duct 1. The air volume is controlled through the diverter block 7 and the guide plate 6, so that the air volume is dispersed into multiple strands when passing through the diverter block 7 and the guide plate 6. At the same time, the guide block 5 is installed at the bending part inside the hot air duct 1, thereby improving the effect of guiding the air volume.

[0025] like Figure 1 , Figure 2 , Figure 4 and Figure 6 As shown, the protection component 3 also includes a rectangular frame 305 installed inside the hot air duct 1, and sliders 304 are fixedly installed on both sides of the outside of the rectangular frame 305. The outside of the rectangular frame 305 is fixedly connected with a cover plate 302, and the outside of the cover plate 302 is installed with a shell 301. Adjustment blocks 306 are arranged on both sides of the outside of the cover plate 302, and one end of the outside of the adjustment block 306 is connected to a second connecting rod 307. The inside of the hot air duct 1 is fixedly connected with slide rails 303 on both sides; The outside of the slider 304 slides horizontally in the slide rail 303, and the outside of the rectangular frame 305 contacts the inner wall of the hot air duct 1; grooves are provided on both sides of the outside of the housing 301, and the adjustment block 306 and the second connecting rod 307 are installed in the grooves; A plurality of nuts and bolts are installed on the outside of the cover plate 302 , and the plurality of nuts and bolts are connected to the inside of the housing 301 ; a rectangular hole is opened on the outside of the bottom end of the hot air duct 1 , and the rectangular frame 305 slides horizontally in the rectangular hole.

[0026] The above scheme is adopted: a rectangular hole is opened on the outside of the hot air duct 1. When the equipment is used, the adjustment block 306 is pulled to move along the grooves opened on both sides of the outside of the shell 301, so that the adjustment block 306 is expanded outward, and the shell 301 and the rectangular frame 305 are driven to slide outward along the rectangular hole opened on the outside of the hot air duct 1 by pulling the adjustment block 306. At the same time, the slider 304 is driven to slide along the inside of the slide rail 303, and the rectangular frame 305 is taken out as a whole. By rotating the nuts and bolts installed on the outside of the cover plate 302, it is convenient to open the cover plate 302, and the second adjustment component 9 set inside the shell 301 is maintained and cleaned. In this process, the service life of the second adjustment component 9 is improved, and the dustproof effect of the second adjustment component 9 is improved by the shell 301 and the cover plate 302.

[0027] The working principle and use process of the present invention: First, one end of the hot air duct 1 is connected to the coal mill inlet, and the outside of the cold air duct 2 is connected to the primary fan in the prior art. When the air volume in the hot air duct 1 needs to be adjusted, the servo motor 901 is started, and the second worm 902 is driven to rotate by the servo motor 901, and the second worm 902 drives the second worm gear 903 to rotate. The second worm gear 903 drives the first connecting rod 904 and the first protrusion 905 to rotate, and the first protrusion 905 drives the first connecting block 906 to make the first connecting block 906 move in a circle along the external connection of the first protrusion 905. At the same time, the first connecting block 906 pulls the second connecting block 907 and the second protrusion 908 to rotate in a circle with the connecting rod 911 as the axis point, thereby driving the connecting rod 911 to rotate, and driving the rotating plate 910 to rotate, and the inside of the hot air duct 1 is opened and closed through the rotation of the rotating plate 910. The air volume is thereby controlled, and the drive motor 401 is started at the same time, and the drive motor 401 drives the rotating shaft 402 to rotate, and the rotating shaft 402 drives the first worm 403 to rotate, and at the same time the first worm 403 drives the first worm wheel 404 to rotate, and the first worm wheel 404 drives the cylinder 405 and the first blade 408 to rotate, so that the first blade 408 rotates along the top surface of the second blade 409, and the first blade 408 overlaps with the second blade 409, so as to control the size of the air volume. When the equipment is finished working, the adjusting block 306 is pulled to rotate the adjusting block 306 along the grooves opened on both sides of the outer shell 301, so as to take the adjusting block 306 out of the groove, and the outer shell 301 and the rectangular frame 305 are driven by pulling the adjusting block 306, and at the same time the rectangular frame 305 drives the slider 304, so that the slider 304 slides along the inside of the slide rail 303 to the outside, so as to take out the rectangular frame 305.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] 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 primary air volume regulation system at a coal mill inlet, comprising a hot air duct (1), characterized in that: A cold air duct (2) is installed at one end of the outside of the hot air duct (1); a first adjustment component (4) is arranged on one side of the outside of the hot air duct (1); a protection component (3) is installed on the other side of the outside of the hot air duct (1); a guide block (5) is fixedly installed at the inner bending part of the hot air duct (1); a guide plate (6) and a filter plate (8) are installed inside the hot air duct (1); a diverter block (7) is fixedly connected to the outside of the guide plate (6); and a second adjustment component (9) is arranged inside the protection component (3); The first regulating component (4) further comprises a fixing frame (406) arranged inside the hot air duct (1), a third protrusion (407) being installed inside the fixing frame (406), a second blade (409) being installed inside the fixing frame (406), a first blade (408) being installed on the top surface of the second blade (409), a cylinder (405) being sleeved inside the first blade (408), a first worm gear (404) being sleeved outside the cylinder (405), a first worm (403) being meshed outside the first worm gear (404), a rotating shaft (402) being sleeved inside the first worm gear (403), and a driving motor (401) being installed at one end outside the rotating shaft (402); The second adjustment component (9) further comprises a rotating plate (910) installed inside the hot air duct (1); the interior of the rotating plate (910) is connected to a connecting round rod (911); the external top end of the connecting round rod (911) is sleeved with a second protrusion (908); the top of the second protrusion (908) is movably connected to a second connecting block (907); the exterior of the second connecting block (907) is connected to a first connecting block (906); the external top surface of the first connecting block (906) is provided with a first protrusion (905); the interior of the first protrusion (905) is sleeved with a first connecting rod (904); the exterior of the first connecting rod (904) is sleeved with a second worm gear (903); the exterior of the second worm gear (903) is meshed with a second worm (902); a servo motor (901) is installed at one external end of the second worm gear (902); and a support seat (913) is provided on the exterior of the servo motor (901).

2. The coal mill inlet primary air volume adjustment system according to claim 1, characterized in that: The protection component (3) further comprises a rectangular frame (305) installed inside the hot air duct (1), sliders (304) are fixedly installed on two sides of the outside of the rectangular frame (305), a cover plate (302) is fixedly connected to the outside of the rectangular frame (305), a shell (301) is installed on the outside of the cover plate (302), adjustment blocks (306) are arranged on two sides of the outside of the cover plate (302), one end of the outside of the adjustment block (306) is connected to a second connecting rod (307), and slide rails (303) are fixedly connected to two sides of the inside of the hot air duct (1).

3. The coal mill inlet primary air volume adjustment system according to claim 1, characterized in that: The guide plate (6) is in an "L" shape, the outside of the guide plate (6) is in contact with the inner wall of the hot air duct (1), and a plurality of diversion blocks (7) are fixedly connected to the outside of the guide plate (6).

4. The coal mill inlet primary air volume adjustment system according to claim 2, characterized in that: The outside of the sliding block (304) slides horizontally in the sliding rail (303), and the outside of the rectangular frame (305) contacts the inner wall of the hot air duct (1).

5. The coal mill inlet primary air volume adjustment system according to claim 1, characterized in that: First round rods are provided at both ends of the interior of the first connecting block (906), and the first round rods are connected to the interior of the first protruding block (905) and the second connecting block (907).

6. The coal mill inlet primary air volume adjustment system according to claim 2, characterized in that: Grooves are provided on both sides of the exterior of the housing (301), and the adjustment block (306) and the second connecting rod (307) are installed in the grooves.

7. The coal mill inlet primary air volume adjustment system according to claim 2, characterized in that: A plurality of nuts and bolts are installed on the outside of the cover plate (302), and the plurality of nuts and bolts are connected to the inside of the housing (301).

8. The coal mill inlet primary air volume adjustment system according to claim 2, characterized in that: The bottom of the support seat (913) is mounted on the outside of the rectangular frame (305), and the outer bottom surface of the second protrusion (908) is in contact with the outside of the rectangular frame (305).

9. The coal mill inlet primary air volume adjustment system according to claim 2, characterized in that: A rectangular hole is provided on the outside of the bottom end of the hot air duct (1), and the rectangular frame (305) slides horizontally in the rectangular hole.

10. The coal mill inlet primary air volume adjustment system according to claim 1, characterized in that: There are two guide plates (6), and the two guide plates (6) are installed at the inner bending position of the hot air duct (1).

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