A dynamic and static ring gap adjusting device

Abstract

The application relates to the technical field of coal mills, and provides a dynamic and static ring gap adjusting device, a wind ring assembly, a compensation ring, a detection rod, a driving piece and a transmission assembly. The wind ring assembly comprises coaxially arranged static rings and dynamic rings, and the dynamic and static ring gaps exist between the static rings and the dynamic rings. The compensation ring is slidably arranged on the static ring, and one end of the compensation ring can slide into the dynamic and static ring gap. The detection rod is located outside the compensation ring, and one end of the detection rod abuts against the dynamic ring after penetrating through the static ring. The driving piece is used for simultaneously driving the compensation ring and the detection rod to slide. The transmission assembly is used for driving the driving piece to move. The application can reduce the adjusting difficulty of the dynamic and static ring gaps.

Description

Technical Field

[0001] This application relates to the technical field of coal mills, and in particular to a device for adjusting the gap between the moving and stationary rings. Background Technology

[0002] Medium-speed coal mills refer to coal mills with an operating speed of 50–300 r / min. They are specialized equipment for preparing auxiliary materials for blast furnace ironmaking, providing suitable auxiliary materials—pulverized coal—to the blast furnace ironmaking system. Medium-speed coal mills are the most important large-scale equipment in coal-to-oil pulverizing systems; their operational safety and economy are extremely important for the normal operation of coal-to-oil production.

[0003] The moving and stationary rings of a coal mill are key components, playing a crucial role in organizing primary air to dry pulverized coal and delivering it to the boiler for combustion. The primary airflow field directly affects the air-to-pulverized coal ratio, mill output, pulverized coal fineness, and the characteristics of gravel discharge. During operation, the moving and stationary rings move and wear, causing the gap between them to gradually widen. This results in turbulent flow within the medium-speed mill, reducing primary air efficiency. Consequently, the primary air diverges at the outlet, carrying pulverized coal into ineffective grinding zones and increasing grinding time. Worsening mill wear further reduces ventilation output. Currently, when the gap between the moving and stationary rings widens, the primary solution is often to replace the damaged components to increase the outlet air velocity. However, this repair method is difficult, time-consuming, and labor-intensive. Summary of the Invention

[0004] To reduce the difficulty of adjusting the gap between the moving and stationary rings, this application provides a device for adjusting the gap between the moving and stationary rings.

[0005] This application provides a device for adjusting the gap between the moving and stationary rings, which adopts the following technical solution:

[0006] A device for adjusting the gap between moving and stationary rings, comprising:

[0007] An air ring assembly, comprising a stationary ring and a rotating ring coaxially arranged, with a gap between the stationary ring and the rotating ring;

[0008] A compensation ring is slidably disposed on the stationary ring, and one end of the compensation ring can slide into the gap between the moving and stationary rings;

[0009] A detection rod is located outside the compensation ring, with one end of the detection rod passing through the stationary ring and abutting against the moving ring;

[0010] A driving component, which is used to simultaneously drive the compensation ring and the detection rod to slide;

[0011] A transmission assembly for driving the drive component to move.

[0012] By adopting the above technical solution, after the medium-speed coal mill has been running for a period of time, it is shut down. The transmission assembly drives the drive component to move, causing the drive component to move the detection rod towards the stationary ring. If the upper surface of the rotating ring descends, the end of the detection rod will no longer abut against the rotating ring end face. The detection rod will then move under the action of the drive component until it abuts against the rotating ring end face again. The drive component's movement also drives the compensation ring towards the stationary ring, partially sealing the enlarged gap between the rotating and stationary rings, thus reducing the gap and achieving adjustment. If the gap between the rotating and stationary rings does not widen due to the descent of the upper surface of the rotating ring, the end of the detection rod remains in contact with the rotating ring end face. When the transmission assembly drives the drive component, the detection rod obstructs the drive component's movement, making it difficult for the transmission assembly to move the drive component. The operator can judge the wear or misalignment of the upper surface of the rotating ring by observing the movement of the drive component.

[0013] Optionally, the detection rod includes a rod body and a ball rotatably disposed at one end of the rod body, the ball being used to abut against the moving ring.

[0014] By adopting the above technical solution, when the detection rod is installed on the air ring assembly, the ball at one end of the rod abuts against the moving ring to reduce the friction between the detection rod and the moving ring. Even without shutting down the medium-speed coal mill, the detection rod can be driven to move to detect the gap between the moving and stationary rings.

[0015] Optionally, the driving component includes a driving block, on which a first driving surface and a second driving surface are provided, and both the first driving surface and the second driving surface are inclined downward in a direction away from the compensation ring.

[0016] The distance between the first driving surface and the compensation ring is smaller than the distance between the second driving surface and the compensation ring, and the first driving surface is located above the second driving surface.

[0017] By adopting the above technical solution, if the gap between the moving and stationary rings widens due to the descent of the upper end face of the moving ring, when the transmission assembly drives the driving component to move towards the compensating ring, the second driving surface first presses against the detection rod, and the detection rod gradually moves towards the moving ring as the second driving surface moves; after the detection component moves, the first driving surface also presses against the compensating ring, and the compensating ring moves towards the moving ring as the first driving surface moves, so as to reduce the gap between the moving and stationary rings.

[0018] Optionally, the slopes of the first driving surface and the second driving surface are the same.

[0019] By adopting the above technical solution, the slopes of the first driving surface and the second driving surface are the same, so that when the driving component drives the detection rod and the compensation ring to move simultaneously, the moving distance of the detection rod and the moving distance of the compensation ring are the same; wherein, the moving distance of the detection rod is the amount of descent of the end face of the moving ring, and the moving distance of the compensation ring is the amount of compensation for the gap between the moving and stationary rings; the slopes of the first driving surface and the second driving surface are the same, so that the descent is equal to the compensation amount.

[0020] Optionally, it also includes a coal mill cylinder, the air ring assembly is disposed inside the coal mill cylinder, and the transmission assembly includes a drive screw and an operating rod disposed at one end of the drive screw, the drive screw passing through the side wall of the coal mill cylinder and being rotatably connected to the side wall of the coal mill cylinder;

[0021] The drive screw is threaded to the drive block at one end inside the coal mill barrel. A guide rod is connected to one end of the drive block, and one end of the guide rod passes through the side wall of the coal mill barrel.

[0022] By adopting the above technical solution, when it is necessary to move the driving component, the operating lever is rotated, causing the driving block on the driving screw to move towards the compensating ring. A guide rod is provided at one end of the driving component, and one end of the guide rod passes through the side wall of the coal mill cylinder to prevent the driving block from rotating with the driving screw.

[0023] Optionally, the stationary ring is provided with an adjustment hole for the compensation ring to slide, and the stationary ring is provided with a sliding hole for the detection rod to slide. The inner walls of the adjustment hole and the sliding hole are both made into rough surfaces.

[0024] By adopting the above technical solution, the inner wall of the adjusting hole is set as a rough surface to enhance the friction between the compensation ring and the inner wall of the adjusting hole, so that the compensation ring is not easy to slide when it is not driven by the driving component; the inner wall of the sliding hole is also set as a rough surface to enhance the friction between the detection rod and the inner wall of the sliding hole, so that the detection rod is not easy to slide when it is not driven by the driving component.

[0025] Optionally, the detection rod is provided with an observation rod, and an observation strip hole is opened on the side wall of the coal mill cylinder, with the end of the observation rod away from the detection rod passing through the observation strip hole.

[0026] By adopting the above technical solution, when the detection rod slides under the action of the driving component, the observation rod located on the detection rod slides together with the detection rod, and the operator can obtain the amount of descent of the dynamic ring end face by the position change of the observation rod before and after sliding in the observation strip hole, so as to determine whether the component needs to be replaced.

[0027] Optionally, a sealing assembly is provided inside the observation bar hole. The sealing assembly includes a first force-applying component, a second force-applying component, and a first sealing plate and a second sealing plate that are slidably disposed on the inner sidewall of the observation bar hole.

[0028] The first sealing plate and the second sealing plate are located on both sides of the observation rod. The first force-applying component is used to drive the first sealing plate to move toward the observation rod, and the second force-applying component is used to drive the second sealing plate to move toward the observation rod.

[0029] By adopting the above technical solution, when the observation rod moves with the detection rod, the first sealing plate moves to abut against the observation rod under the action of the first force-applying component, and the second sealing plate abuts against the observation plate under the action of the second force-applying component, so that the observation bar hole is always in a closed state when the detection rod moves or is stationary, and the material in the coal mill cylinder is not easy to leak out from the observation bar hole.

[0030] Optionally, the width of the observation strip hole is equal to the width of the observation rod.

[0031] By adopting the above technical solution, the rod segment of the observation rod located between the first sealing plate and the second sealing plate is completely surrounded between the first sealing plate, the second sealing plate and the inner wall of the observation strip hole, thereby improving the sealing performance at the observation strip hole.

[0032] In summary, this application includes at least one of the following beneficial effects:

[0033] 1. This application includes a compensation ring, a detection rod, and a driving component. The driving component drives the detection rod to move towards the stationary ring. If the gap between the moving and stationary rings widens due to the descent of the upper end face of the moving ring, the end of the detection rod will no longer abut against the end face of the moving ring. The moving driving component drives the detection rod to move down to continue abutting against the stationary ring. When the driving component moves, it can also drive the compensation ring to move towards the stationary ring, partially blocking the widened gap between the moving and stationary rings, thereby achieving the adjustment of the gap between the moving and stationary rings.

[0034] 2. The driving component in this application is used to simultaneously drive the compensation ring and the detection rod to slide. If the detection rod is difficult to slide under the action of the driving component, the driving component cannot drive the compensation ring to move. The operator can judge whether the upper end face of the moving ring has dropped by the movement state of the driving component, thereby knowing the approximate expansion of the gap between the moving and stationary rings.

[0035] 3. The detection rod in this application includes a rod body and a ball bearing rotatably disposed at one end of the rod body, so as to reduce the friction between one end of the detection rod and the moving ring. It can also detect the gap between the moving and stationary rings during the operation of the medium-speed coal mill. Attached Figure Description

[0036] Figure 1This is a partial cross-sectional view of the dynamic and static ring gap adjustment device according to an embodiment of this application;

[0037] Figure 2 yes Figure 1 Enlarged structural diagram at point A;

[0038] Figure 3 This is a schematic diagram of the overall structure of the compensation ring in an embodiment of this application.

[0039] Explanation of reference numerals in the attached drawings: 1. Air ring assembly; 11. Stationary ring; 111. Stationary inner ring; 112. Stationary outer ring; 113. Connecting strip; 114. Adjusting hole; 115. Sliding hole; 12. Moving ring; 13. Gap between moving and stationary rings; 131. Lateral gap; 132. Longitudinal gap; 2. Compensation ring; 21. Relief groove; 3. Detection rod; 31. Rod body; 32. Ball bearing; 4. Drive block; 41. First drive surface; 42. Second drive surface; 5. Transmission assembly; 51. Drive screw; 52. Operating rod; 53. Guide rod; 531. Limiting block; 6. Coal mill cylinder; 61. Observation strip hole; 611. First slot; 612. Second slot; 7. Observation rod; 8. Sealing assembly; 81. First force-applying component; 82. Second force-applying component; 83. First sealing plate; 84. Second sealing plate. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0041] This application provides a device for adjusting the gap between the moving and stationary rings.

[0042] refer to Figure 1 and Figure 2 A device for adjusting the gap between the stationary and moving rings includes a coal mill cylinder 6 and an air ring assembly 1 disposed inside the coal mill cylinder 6. The air ring assembly 1 includes a stationary ring 11 and a moving ring 12 arranged coaxially. The stationary ring 11 is detachably fixed to the inner wall of the coal mill cylinder 6. The moving ring 12 is rotatably disposed below the stationary ring 11. The stationary ring 11 and the moving ring 12 gradually form a gap 13 between the stationary and moving rings. The gap 13 between the stationary and moving rings includes a transverse gap 131 and a longitudinal gap 132 that are connected.

[0043] refer to Figure 1 and Figure 2A compensation ring 2 and a detection rod 3 are slidably mounted on the stationary ring 11. The detection rod 3 is located between the compensation ring 2 and the inner wall of the coal mill cylinder 6. The stationary ring 11 includes a coaxially arranged inner stationary ring 111 and an outer stationary ring 112, with the bottom ends of the outer stationary ring 112 and the inner stationary ring 111 located on the same horizontal plane. An annular adjustment hole 114 is formed between the outer wall of the inner stationary ring 111 and the inner wall of the outer stationary ring 112, allowing the compensation ring 2 to slide. Multiple connecting strips 113 are fixed inside the adjustment hole 114, providing a fixed connection between the inner stationary ring 111 and the outer stationary ring 112. In this embodiment, four connecting strips 113 are evenly spaced around the axis of the adjustment hole 114.

[0044] refer to Figure 1 and Figure 3 One end of the compensation ring 2 has a relief groove 21 that corresponds one-to-one with the connecting strip 113. When the compensation ring 2 slides in the adjusting hole 114, the connecting strip 113 is engaged in the relief groove 21. The side walls of the adjusting hole 114 are all made with rough surfaces to enhance the friction between the compensation ring 2 and the inner side wall of the adjusting hole 114, so that the compensation ring 2 is not easy to slip during the operation of the medium-speed coal mill.

[0045] refer to Figure 2 A sliding hole 115 is provided on the stationary ring 11. One end of the detection rod 3 passes through the sliding hole 115 and abuts against the end face of the rotating ring 12. The detection rod 3 is slidably disposed within the sliding hole 115. The detection rod 3 includes a rod body 31 and a ball bearing 32 rotatably connected to one end of the rod body 31. The ball bearing 32 is located at the end of the rod body 31 near the rotating ring 12, and the ball bearing 32 abuts against the end face of the rotating ring 12. The inner sidewall of the sliding hole 115 is made into a rough surface to enhance the friction between the detection rod 3 and the inner sidewall of the sliding hole 115, making it less likely for the detection rod 3 to slip during the operation of the medium-speed coal mill.

[0046] refer to Figure 2A driving component, including a driving block 4, is disposed above the stationary ring 11. A first driving surface 41 and a second driving surface 42 are integrally formed on one end of the driving block 4 near the stationary ring 11; both the first driving surface 41 and the second driving surface 42 are inclined downwards away from the compensation ring 2. The first driving surface 41 is located on one side of the compensation ring 2, and the second driving surface 42 is located on one side of the detection rod 3. The vertical height of the upper end face of the compensation ring 2 is greater than the vertical height of the upper end face of the detection rod 3, and the first driving surface 41 is located above the second driving surface 42. The slope of the first driving surface 41 is greater than or equal to the slope of the second driving surface 42; in this embodiment, the slopes of the first driving surface 41 and the second driving surface 42 are equal. If the upper end face of the moving ring 12 descends, causing the transverse gap 131 of the moving-stationary ring gap 13 to widen, when the driving block 4 moves towards the compensating ring 2, the second driving surface 42 drives the detection rod 3 to move towards the moving ring 12; simultaneously, the first driving surface 41 drives the compensating ring 2 to slide out of the adjusting hole 114 towards the moving ring 12, partially blocking the transverse gap 131, thereby adjusting the moving-stationary ring gap 13. Under the action of the compensating ring 2, the air outlet efficiency of the moving-stationary ring gap 13 is restored, improving the ventilation output of the coal mill and reducing the energy consumption of the medium-speed coal mill.

[0047] refer to Figure 2 If the gap 13 between the moving and stationary rings does not widen due to the descent of the upper surface of the moving ring 12, the detection rod 3 will obstruct the movement of the drive block 4 when the drive block 4 moves, and the position of the compensation ring 2 will remain unchanged. The operator can determine whether the gap 13 between the moving and stationary rings has widened by observing the movement state of the drive component. In other embodiments, multiple detection rods 3 can be set on the stationary ring 11 according to the required detection accuracy, with the drive component and the detection rod 3 corresponding one-to-one.

[0048] refer to Figure 2 The coal mill cylinder 6 is equipped with transmission components 5 corresponding to the driving components. Each transmission component 5 includes a drive screw 51 and an operating rod 52. The drive screw 51 passes through the side wall of the coal mill cylinder 6 and is rotatably connected to the inner wall of the coal mill cylinder 6 via bearings. One end of the drive screw 51 is threaded into the drive block 4, and the other end is fixedly connected to the operating rod 52, which is located outside the coal mill cylinder 6. A guide rod 53 is fixed to one end of the drive block 4 near the side wall of the coal mill cylinder 6. The guide rod 53 is parallel to the drive screw 51, and one end of the guide rod 53 passes through the side wall of the coal mill cylinder 6 and connects to a limit block 531. When it is necessary to detect the change in the gap 13 between the moving and stationary rings, rotating the operating rod 52 will move the driving component closer to the compensation ring 2.

[0049] refer to Figure 3To directly observe the approximate expansion of the gap 13 between the moving and stationary rings, an observation rod 7 is fixed on the side wall of the detection rod 3, and the observation rod 7 is set perpendicular to the detection rod 3. An observation slot 61 is provided on the side wall of the coal mill cylinder 6. A sealing component 8 is provided in the observation slot 61, which includes a first sealing plate 83 and a second sealing plate 84 arranged opposite to each other; a first slot 611 is provided on the inner side wall of the observation slot 61, and one end of the first sealing plate 83 slides in the first slot; a second slot is also provided on the inner side wall of the observation slot 61, and one end of the second sealing plate 84 slides in the second slot 612. The end of the observation rod 7 away from the detection rod 3 passes through the observation slot 61 between the first sealing plate 83 and the second sealing plate 84.

[0050] refer to Figure 2 A first force-applying member 81 is connected between the inner wall of the first snap-fit ​​groove and the first sealing plate 83, and a second force-applying member 82 is connected between the inner wall of the second snap-fit ​​groove 612 and the second sealing plate 84. In this embodiment, both the first force-applying member 81 and the second force-applying member 82 are springs. When the detection rod 3 moves downward under the action of the driving member, the observation rod 7 moves downward together with the observation rod 7; the operator can obtain the amount of descent of the end face of the moving ring 12 by the position change of the observation rod 7 before and after sliding in the observation strip hole 61. When the observation rod 7 moves, the first sealing plate 83 moves downward with the observation rod 7 under the action of the first force-applying member 81, and the second sealing plate 84 moves downward under the pressure of the observation plate. This makes the rod segment of the observation rod 7 located between the first sealing plate 83 and the second sealing plate 84 completely surrounded between the first sealing plate 83, the second sealing plate 84 and the inner wall of the observation strip hole 61, so as to improve the sealing performance at the observation strip hole 61.

[0051] The implementation principle of the dynamic-static ring gap adjustment device in this application embodiment is as follows: After the medium-speed coal mill has been running for a period of time, the medium-speed coal mill is shut down; the operating lever 52 is rotated to drive the driving block 4 to move towards the compensating ring 2. If the operator observes that the observation rod 7 moves, it indicates that the dynamic-static ring gap 13 has widened due to the lowering of the upper end face of the dynamic ring 12. As the driving block 4 moves, the detection rod 3 moves under the action of the second driving surface 42 to abut against the static ring 11 again; the compensating ring 2 moves towards the static ring 11 under the action of the first driving surface 41, partially blocking the widened dynamic-static ring gap 13, thereby reducing the dynamic-static ring gap 13 and achieving the adjustment of the dynamic-static ring gap 13. If the operator observes that the observation rod 7 does not move when rotating the operating lever 52, it indicates that the upper end face of the dynamic ring 12 has not lowered; at this time, the end of the detection rod 3 abuts against the end face of the dynamic ring 12, and the relative position of the compensating ring 2 and the static ring 11 remains unchanged.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dynamic stator-rotor gap adjustment device, characterized by, The wind ring assembly (1) comprises a static ring (11) and a dynamic ring (12) arranged coaxially, and a dynamic-static ring gap (13) is formed between the static ring (11) and the dynamic ring (12); a compensation ring (2) is arranged on the static ring (11) in a sliding manner, and one end of the compensation ring (2) can slide into the dynamic-static ring gap (13); a detection rod (3) is arranged outside the compensation ring (2), and one end of the detection rod (3) passes through the static ring (11) and abuts against the dynamic ring (12); a driving member is arranged for simultaneously driving the compensation ring (2) and the detection rod (3) to slide; a transmission assembly (5) is arranged for driving the driving member to move; the driving member comprises a driving block (4), and a first driving surface (41) and a second driving surface (42) are arranged on the driving block (4); the first driving surface (41) and the second driving surface (42) are both inclined downward in a direction away from the compensation ring (2); the distance between the first driving surface (41) and the compensation ring (2) is smaller than the distance between the second driving surface (42) and the compensation ring (2), and the first driving surface (41) is located above the second driving surface (42); a coal mill barrel (6) is further arranged, the wind ring assembly (1) is arranged in the coal mill barrel (6), the transmission assembly (5) comprises a driving screw (51) and an operating rod (52) arranged at one end of the driving screw (51), and the driving screw (51) passes through the side wall of the coal mill barrel (6) and is rotationally connected with the side wall of the coal mill barrel (6); one end of the driving screw (51) located in the coal mill barrel (6) is threadedly connected with the driving block (4), one end of the driving block (4) is connected with a guide rod (53), and one end of the guide rod (53) passes through the side wall of the coal mill barrel (6); an adjusting hole (114) for the sliding of the compensation ring (2) is arranged on the static ring (11), a sliding hole (115) for the sliding of the detection rod (3) is arranged on the static ring (11), and the inner side walls of the adjusting hole (114) and the sliding hole (115) are both arranged as rough surfaces; an observation rod (7) is arranged on the detection rod (3), an observation strip hole (61) is arranged on the side wall of the coal mill barrel (6), and one end of the observation rod (7) located away from the detection rod (3) passes through the observation strip hole (61). The detection rod (3) comprises a rod body (31) and a ball (32) rotationally arranged at one end of the rod body (31), and the ball (32) is arranged to abut against the dynamic ring (12). The slopes of the first driving surface (41) and the second driving surface (42) are the same. The observation strip hole (61) is provided with a sealing assembly (8), and the sealing assembly (8) comprises a first urging member (81), a second urging member (82), and a first sealing plate (83) and a second sealing plate (84) arranged on the inner side wall of the observation strip hole (61) in a sliding manner. ​ ​ ​ ​ ​ ​ ​ ​ 2. A dynamic stator-rotor interstitial gap adjustment device according to claim 1, wherein, ​ 3. The dynamic stator / scroll gap adjustment device of claim 1, wherein, ​ 4. The dynamic stator / scroll gap adjustment device of claim 1, wherein, ​ The first closing plate (83) and the second closing plate (84) are respectively located on both sides of the observation rod (7), the first force applying member (81) is used to drive the first closing plate (83) to move towards the direction close to the observation rod (7), and the second force applying member (82) is used to drive the second closing plate (84) to move towards the direction close to the observation rod (7).

5. A dynamic stator-rotor interstitial gap adjustment device according to claim 4, wherein, The width of the observation strip hole (61) is equal to the width of the observation rod (7).

Images