Guide plate structure for coal mill
By designing the guidance plate structure of ceramic materials in the coal mill, the problem of high temperature anti -grinding coatings caused by the thick side wall of the coal grinder wind wheels is high and the welding plugs are easily damaged, and the grinding grinding is achieved. The effect of the life of the coal machine and the stability of the internal flow field.
Patent Information
- Application Number
- CN202421114416.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-05-21
AI Technical Summary
There is a gap in the thickened side walls of the wind wheel of the medium-speed bowl coal grinder, which leads to high-temperature anti-wear coating cost and complex construction, and the fixed welding plug of the high-chromium cast iron lining plate is easily blown, affecting the coal grinder safe operation and internal flow field stability.
The design of a coal milling machine is designed, which uses ceramic materials, including vertical sections and diameter sections. The vertical section is located between the wind wheel and the coal mill shell. Gradually increase the width of the section away from the direction of the vertical section to prevent the heat wind from eroding and guiding the hot air.
Effectively prevent the direct impact of the wind wheel heat at one wind on the side wall, improve the service life of the coal mill, reduce the "escape volume" of the hot air in the guidance plate area, improve the efficiency of the use of thermal air use and maintain the stability of the flow field in the coal mill.
Smart Images
Figure CN222401670U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of coal mill structures, and in particular relates to a guide plate structure for a coal mill. Background Art
[0002] The original design of the medium-speed bowl-type coal mill is to set a thickened side wall on the outer periphery of the impeller. The original thickened side wall is made of a high-chromium cast iron liner fixed on the base through a welding plug. Due to the gap in the assembly position of the original thickened side wall, the gap needs to be filled with high-temperature resistant and wear-resistant coating to prevent the base from being blown away and causing the internal flow field of the coal mill to be turbulent. At the same time, the use cost of high-temperature resistant and wear-resistant coating is relatively high and the construction process is complicated; the fixed welding plug of the high-chromium cast iron liner of the original thickened side wall is easily blown away, which may cause the liner to fall off in severe cases. The fallen liner may cause the grinding roller assembly to get stuck during operation or cause impact damage to the grinding roller sleeve of the grinding roller assembly, thereby affecting the safe operation of the coal mill; the original thickened side wall adopts an angled structure, and the gap between the thickened side wall and the impeller side wall can only be adjusted through the impeller outer ring adjustment plate, and the adjustment workload is large and the adjustment accuracy is relatively low, resulting in uneven gap adjustment, which is not conducive to the stability of the internal flow field of the coal mill and is easy to cause eccentric wear of the coal mill or related accessories. Utility Model Content
[0003] In view of the above-mentioned technical problems, the utility model provides a guide plate structure for a coal mill to solve the problem of blowing damage on the periphery of the wind wheel of the existing coal mill. A guide plate structure for a coal mill is designed, which can effectively prevent the hot primary air of the wind wheel from directly impacting the side wall and improve the service life.
[0004] The utility model provides a guide plate structure for a coal mill, comprising a coal mill housing, a grinding disc, a wind wheel, a grinding roller and a guide plate, wherein the grinding disc, the wind wheel, the grinding roller and the guide plate are all located in the coal mill housing, the grinding roller is located above the grinding disc, the wind wheel is arranged at the outer periphery of the grinding disc, the guide plate surrounds the outer periphery of the wind wheel, and the guide plate and the wind wheel are arranged at intervals, the outer wall of the guide plate is fixed to the inner wall of the coal mill housing, the guide plate is a ceramic part, the guide plate comprises a vertical section and an expanded diameter section, the vertical section is located between the wind wheel and the inner wall of the coal mill, the expanded diameter section is located above the vertical section, and the width of the cross section of the expanded diameter section gradually increases in a direction away from the vertical section.
[0005] Furthermore, the guide plate structure for the coal mill also includes a mounting seat, the mounting seat is connected to the coal mill housing, and the grinding roller is rotatably mounted on the mounting seat.
[0006] Furthermore, the wind wheel is provided with a plurality of ventilation holes.
[0007] The guide plate structure for the coal mill is provided with a guide plate between the wind wheel and the inner wall of the coal mill housing. The guide plate is a ceramic part and has the advantage of wear resistance compared with the coal mill housing made of metal. The vertical section is used to avoid hot wind erosion in the gap between the wind wheel and the coal mill housing. An expanded diameter section is arranged above the guide plate. On the one hand, the expanded diameter section has a higher erosion resistance and can guide the hot primary air away from the inner wall of the coal mill housing, thereby better protecting the coal mill housing and prolonging its service life. On the other hand, it can greatly reduce the "escape amount" of hot air in the guide plate area, thereby effectively improving the hot air utilization efficiency and maintaining the stability of the internal flow field of the coal mill. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0009] Figure 1 It is a structural schematic diagram of a guide plate structure for a coal mill; DETAILED DESCRIPTION
[0010] The utility model discloses a guide plate structure for a coal mill. The guide plate structure for a coal mill can effectively prevent the hot primary air of a wind wheel from directly impacting a side wall, thereby increasing the service life.
[0011] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution in the utility model. Obviously, what is described is only a part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0012] See also Figure 1As shown, the utility model provides a guide plate structure for a coal mill, comprising a coal mill housing 5, a grinding disc 2, a wind wheel 1, a grinding roller 7 and a guide plate, wherein the grinding disc 2, the wind wheel 1, the grinding roller 7 and the guide plate are all located in the coal mill housing 5, the grinding roller 7 is located above the grinding disc 2, the wind wheel 1 is arranged at the outer periphery of the grinding disc 2, the guide plate surrounds the outer periphery of the wind wheel 1, and the guide plate and the wind wheel 1 are spaced apart, the outer wall of the guide plate is fixed to the inner wall of the coal mill housing 5, the guide plate is a ceramic part, the guide plate comprises a vertical section 3 and an expanded diameter section 4, the vertical section 3 is located between the wind wheel 1 and the inner wall of the coal mill, the expanded diameter section 4 is located above the vertical section 3, and the width of the cross section of the expanded diameter section 4 gradually increases in the direction away from the vertical section 3.
[0013] The guide plate structure for the coal mill further includes a mounting seat 6 , which is connected to the coal mill housing 5 , and the grinding roller 7 is rotatably mounted on the mounting seat 6 .
[0014] The wind wheel 1 is provided with a plurality of ventilation holes.
[0015] The guide plate structure for the coal mill is provided with a guide plate between the wind wheel 1 and the inner wall of the coal mill housing 5. The guide plate is a ceramic part and has the advantage of wear resistance compared with the coal mill housing 5 made of metal. The vertical section 3 is used to avoid hot wind erosion in the gap between the wind wheel 1 and the coal mill housing 5. An expanded diameter section 4 is provided above the guide plate. On the one hand, the expanded diameter section 4 has a higher erosion resistance and can guide the hot primary air away from the inner wall of the coal mill housing 5, thereby better protecting the coal mill housing 5 and prolonging its service life. On the other hand, it can greatly reduce the "escape amount" of hot air in the guide plate area, thereby effectively improving the hot air utilization efficiency and maintaining the stability of the internal flow field of the coal mill.
[0016] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.
Claims
1. A guide plate structure for a coal mill, characterized in that: The invention comprises a coal mill housing, a grinding disc, a wind wheel, a grinding roller and a guide plate, wherein the grinding disc, the wind wheel, the grinding roller and the guide plate are all located in the coal mill housing, the grinding roller is located above the grinding disc, the wind wheel is arranged at the outer periphery of the grinding disc, the guide plate surrounds the outer periphery of the wind wheel, and the guide plate and the wind wheel are arranged at intervals, the outer wall of the guide plate is fixed to the inner wall of the coal mill housing, the guide plate is a ceramic part, the guide plate comprises a vertical section and an expanded diameter section, the vertical section is located between the wind wheel and the inner wall of the coal mill, the expanded diameter section is located above the vertical section, and the width of the cross section of the expanded diameter section gradually increases in the direction away from the vertical section.
2. A guide plate structure for a coal mill according to claim 1, characterized in that: The guide plate structure for the coal mill also includes a mounting seat, which is connected to the coal mill housing, and the grinding roller is rotatably mounted on the mounting seat.
3. The guide plate structure for a coal mill according to claim 1, characterized in that: The wind wheel is provided with a plurality of ventilation holes.