Pebble coal chamber of coal mill
By using a wear-resistant scraper and arc-shaped sealing ring in the gravel coal chamber of the coal mill, the torsion spring applies pre-force to make the scraper swing and buffer impact when subjected to resistance, solving the problem of easy wear of the scraper, improving the cleaning efficiency and service life, reducing maintenance costs, and ensuring the safe and stable operation of the coal mill.
Patent Information
- Application Number
- CN202420731113.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-10
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-04-10
AI Technical Summary
The scraper of the gravel coal chamber of the coal mill is prone to wear, affecting the cleaning effect, resulting in high equipment maintenance costs, and when the scraper is partially worn, it will cause debris to accumulate or spontaneous combustion, affecting the safe and stable operation of the coal mill.
A coal grinder gravel chamber is designed, using a wear-resistant scraper and an arc-shaped sealing ring. The wear-resistant scraper can swing and buffer impact when subjected to resistance, extend the service life, and avoid cleaning blind spots through the arc-shaped sealing ring.
It improves the design efficiency of the scraper in the gravel coal chamber, reduces equipment maintenance costs, extends the service life of the scraper, and ensures the cleaning effect and the safe and stable operation of the coal mill.
Smart Images
Figure CN222624794U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of coal mill structure, in particular to a coal mill stone coal chamber. Background Art
[0002] During the operation of the coal mill, the debris in the coal that is difficult to break, such as iron blocks and gravel coal, cannot be carried away by the airflow. They fall into the gravel coal chamber at the bottom of the grinding bowl through the impeller device. Four scrapers are symmetrically installed at the bottom of the grinding bowl to scrape the debris in the gravel coal chamber into the gravel coal box for storage and regular discharge. As the gravel coal chamber scraper continues to clean the debris in the gravel coal chamber as the coal mill runs, the gravel coal chamber scraper will start to wear to varying degrees from the end of the scraper along the contact surface of the cleaning surface and the gap between the gravel coal chamber bottom plate and the gravel coal chamber scraper after running for a period of time. Over time, the wear of the gravel coal chamber scraper gradually increases, its design efficiency gradually decreases, and the cleaning effect gradually decreases. The material of the gravel coal chamber scraper is mostly 16Mn or Q235A combined with bimetallic surfacing and is made as a whole. This type of gravel coal chamber scraper not only has the disadvantages of heavy spare parts, complex disassembly and assembly, high installation precision requirements, large replacement workload, and high maintenance cost, but also when the local wear of the gravel coal chamber scraper exceeds 20mm, it will lead to incomplete cleaning of the gravel coal chamber debris, which can easily cause the accumulation of gravel coal chamber debris or spontaneous combustion of gravel coal, which can directly affect the safe and stable operation of the coal mill in severe cases. Utility Model Content
[0003] In view of the technical problem that the existing gravel coal chamber scrapers are easy to wear and affect the cleaning effect, the utility model provides a gravel coal chamber of a coal mill. The gravel coal chamber of a coal mill can not only improve the design efficiency of the gravel coal chamber scrapers, but also effectively reduce the equipment maintenance cost. At the same time, it has the advantages of simple design, stable operation and easy replacement.
[0004] The utility model provides a coal mill stone coal chamber, comprising a stone coal chamber, a grinding bowl shaft, a support member, a scraper shaft, a torsion spring, a scraper base, a wear-resistant scraper and an arc-shaped sealing ring, wherein the grinding bowl shaft is located in the stone coal chamber, the support member is connected to the side wall of the grinding bowl shaft, the scraper shaft is arranged at the bottom of the support member, the scraper base is rotatably arranged on the scraper shaft, the torsion spring is sleeved on the scraper shaft, and one end of the torsion spring abuts the support member, and the other end of the torsion spring abuts the scraper base, the wear-resistant scraper is connected to the bottom of the scraper base, the wear-resistant scraper is obliquely arranged, and the bottom surface of the wear-resistant scraper abuts the bottom surface of the stone coal chamber, the arc-shaped sealing ring is arranged at the bottom angle of the side wall of the stone coal chamber, the top surface of the arc-shaped sealing ring is an inclined surface, and the top surface of the arc-shaped sealing ring is adapted to the side surface of the wear-resistant scraper.
[0005] Furthermore, the support member is rotatably connected to the grinding bowl shaft, and the rotation axis of the support member is parallel to the rotation axis of the grinding bowl shaft.
[0006] Furthermore, the scraper base is provided with a rectangular bolt hole, and the wear-resistant scraper and the scraper base are installed and connected through the rectangular bolt hole.
[0007] The gravel coal chamber of the coal mill rotates to connect the scraper base to the support and applies a certain force through the torsion spring. Therefore, when the resistance encountered by the wear-resistant scraper is greater than the elastic force of the torsion spring itself, the wear-resistant scraper can achieve a certain degree of swing under the elastic action, thereby buffering the impact damage to the wear-resistant scraper caused by the resistance and further improving the service life of the wear-resistant scraper. Moreover, the wear-resistant scraper is arranged at an angle, and a certain pre-force is applied by the torsion spring to ensure that the wear-resistant scraper fits the bottom surface of the gravel coal chamber. When the wear-resistant scraper has a certain wear, it can also adaptively fit, thereby improving the service life. On the other hand, an arc-shaped sealing ring is arranged on the outer periphery of the wear-resistant scraper, and the top surface of the arc-shaped sealing ring is an inclined surface, which is conducive to guiding the gravel coal at the corners to the wear-resistant scraper and avoiding cleaning dead corners. 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 coal mill stone coal chamber. DETAILED DESCRIPTION
[0010] The utility model discloses a coal mill stone coal chamber, which can not only improve the design efficiency of the stone coal chamber scraper, but also effectively reduce the equipment maintenance cost, and has the advantages of simple design, stable operation, easy replacement, etc.
[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 discloses a coal mill stone coal chamber, including a stone coal chamber 8, a grinding bowl shaft 7, a support member 6, a scraper shaft 4, a torsion spring 5, a scraper base 3, a wear-resistant scraper 2 and an arc-shaped sealing ring 1, wherein the grinding bowl shaft 7 is located in the stone coal chamber 8, the support member 6 is connected to the side wall of the grinding bowl shaft 7, the scraper shaft 4 is arranged at the bottom of the support member 6, the scraper base 3 is rotatably arranged on the scraper shaft 4, and the torsion spring 5 is sleeved on the scraper shaft 4 , and one end of the torsion spring 5 abuts against the support member 6, and the other end of the torsion spring 5 abuts against the scraper base 3, the wear-resistant scraper 2 is connected to the bottom of the scraper base 3, the wear-resistant scraper 2 is arranged at an angle, and the bottom surface of the wear-resistant scraper 2 abuts against the bottom surface of the stone coal chamber 8, and the arc-shaped sealing ring 1 is arranged at the bottom corner of the side wall of the stone coal chamber 8, the top surface of the arc-shaped sealing ring 1 is an inclined surface, and the top surface of the arc-shaped sealing ring 1 is adapted to the side surface of the wear-resistant scraper 2.
[0013] The support member 6 is rotatably connected to the grinding bowl shaft 7 , and the rotation axis of the support member 6 is parallel to the rotation axis of the grinding bowl shaft 7 .
[0014] The scraper base 3 is provided with a rectangular bolt hole, and the wear-resistant scraper 2 and the scraper base 3 are installed and connected through the rectangular bolt hole.
[0015] The gravel coal chamber of the coal mill rotates the scraper base 3 and the support 6, and applies a certain force through the torsion spring 5. Therefore, when the resistance encountered by the wear-resistant scraper 2 is greater than the elastic force of the torsion spring 5 itself, the wear-resistant scraper 2 can achieve a certain degree of swing under the elastic action, thereby buffering the impact damage to the wear-resistant scraper 2 caused by the resistance, and further improving the service life of the wear-resistant scraper 2. Moreover, the wear-resistant scraper 2 is skewed and a certain pre-force is applied by the torsion spring 5, which can ensure that the wear-resistant scraper 2 fits the bottom surface of the gravel coal chamber 8. When the wear-resistant scraper 2 has a certain wear, it can also adaptively fit, thereby improving the service life. On the other hand, an arc-shaped sealing ring 1 is provided on the outer periphery of the wear-resistant scraper 2, and the top surface of the arc-shaped sealing ring 1 is an inclined surface, which is conducive to guiding the gravel coal at the corners to the wear-resistant scraper 2 to avoid cleaning dead corners.
[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 coal mill stone coal chamber, characterized in that: The invention comprises a stone coal chamber, a grinding bowl shaft, a support member, a scraper shaft, a torsion spring, a scraper base, a wear-resistant scraper and an arc-shaped sealing ring, wherein the grinding bowl shaft is located in the stone coal chamber, the support member is connected to the side wall of the grinding bowl shaft, the scraper shaft is arranged at the bottom of the support member, the scraper base is rotatably arranged on the scraper shaft, the torsion spring is sleeved on the scraper shaft, and one end of the torsion spring abuts the support member, and the other end of the torsion spring abuts the scraper base, the wear-resistant scraper is connected to the bottom of the scraper base, the wear-resistant scraper is obliquely arranged, and the bottom surface of the wear-resistant scraper abuts the bottom surface of the stone coal chamber, the arc-shaped sealing ring is arranged at the bottom angle of the side wall of the stone coal chamber, the top surface of the arc-shaped sealing ring is an inclined surface, and the top surface of the arc-shaped sealing ring is matched with the side surface of the wear-resistant scraper.
2. A coal mill stone coal chamber according to claim 1, characterized in that: The support member is rotatably connected to the grinding bowl shaft, and the rotation axis of the support member is parallel to the rotation axis of the grinding bowl shaft.
3. The coal mill stone coal chamber according to claim 1, characterized in that: The scraper base is provided with a rectangular bolt hole, and the wear-resistant scraper and the scraper base are installed and connected through the rectangular bolt hole.