Coal mill and pull rod sealing device thereof
By designing a structure including a first seal, a shell, a sealing bag and an accumulator in the tie rod sealing device of the coal mill, the problem of leakage of the tie rod sealing device of the coal mill is solved, and a higher seal reliability and stability are achieved.
Patent Information
- Application Number
- CN202420015201.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-03
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-01-03
AI Technical Summary
The tie rod sealing device of the coal mill often has leakage problems, resulting in leakage of sealing air and coal powder, affecting the operating stability of the coal mill.
A tie rod sealing device including a first seal, a housing, a sealing bag and an energy accumulator is designed. The device blocks the leakage of sealing wind and coal powder by forming a sealing chamber at the bottom of the housing and controlling the gas pressure when the pull rod is moved by an accumulator, thereby controlling the positive pressure of the sealing chamber.
It effectively improves the seal reliability between the tie rod and the shell, prevents the leakage of sealing air and coal powder, and ensures the normal operation and good stability of the coal mill.
Smart Images
Figure CN222543012U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of coal-fired power plant pulverizing systems, and in particular to a coal pulverizer and a tie rod sealing device thereof. Background Art
[0002] Coal mill is a machine that breaks coal blocks and grinds them into coal powder. It is an important auxiliary equipment for pulverized coal furnace. There are many types of coal mills. According to the rotation speed of the coal mill working parts, they can be divided into three types, namely low-speed coal mill, medium-speed coal mill and high-speed coal mill. Among them, medium-speed coal mill refers to a coal mill with a working speed of 50-300r / min, which is a professional equipment for the preparation and processing of auxiliary materials for blast furnace ironmaking. As one of the important equipment in the pulverizing system, the stability of the operation of the medium-speed coal mill is directly related to the pulverizing efficiency and quality.
[0003] However, it is found that the tie rod seal often leaks during the operation of the coal mill, affecting the running stability of the coal mill. In particular, there is often leakage of sealing air and coal powder between the gap between the outer shell of the tie rod and the tie rod, which seriously affects the normal operation of the coal mill.
[0004] Therefore, there is an urgent need to provide a new technical solution for a tie rod sealing device for a coal mill to improve the sealing reliability of the tie rod sealing device. Utility Model Content
[0005] The purpose of the present disclosure is to provide a coal mill and a tie rod sealing device thereof to avoid the problems of sealing air and coal powder leakage and at least partially solve the related technical problems.
[0006] In order to achieve the above-mentioned purpose, according to the first aspect of the present disclosure, a rod sealing device for a coal mill is provided. The coal mill includes a rod and a shell, the rod extending outward from the inside of the coal mill through the shell, the rod sealing device includes a first sealing member arranged between the rod and the shell, and the rod sealing device also includes: a shell, which is sleeved on the rod, one end of which is connected to the bottom of the shell, and the other end of which extends away from the shell along the extension direction of the rod; a sealing bag, which is sleeved on the rod and located between the shell and the rod, one end of the sealing bag is connected to the circumferential inner side wall of the shell, and the other end is connected to the rod, the shell, the sealing bag and the rod form a sealed chamber; and an accumulator, which is connected to the sealed chamber, and the accumulator is configured to: store gas when the rod moves upward to compress the sealed chamber; and replenish gas into the sealed chamber when the rod moves downward; wherein the gas pressure in the sealed chamber is greater than the gas pressure in the shell.
[0007] Optionally, the outer shell is connected to the bottom of the housing through a flange.
[0008] Optionally, the shell includes a connecting portion connected to the bottom of the flange, and an extending portion sleeved on the outside of the connecting portion, one end of the sealing bag is connected to the connecting portion through a first clamping piece, and the other end is connected to the pull rod through a fixing assembly.
[0009] Optionally, the fixing assembly includes a sliding bearing sleeved outside the pull rod, and the other end of the sealing bag is connected to the sliding bearing via a second clamping member.
[0010] Optionally, a sealing gasket is further provided between the sliding bearing and the pull rod.
[0011] Optionally, a mounting portion is formed by extending from one end of the extension portion away from the housing toward a side close to the pull rod, and the bottom of the sliding bearing is connected to the mounting portion via an elastic component.
[0012] Optionally, the elastic component includes an elastic tube, one end of which is connected to the mounting portion, and the other end of which is connected to the sliding bearing via a mounting plate.
[0013] Optionally, the tie rod sealing device further comprises a safety valve arranged on the outer shell, and the safety valve is used to control the wind pressure inside the sealing chamber.
[0014] Optionally, the accumulator is connected to the housing through a connecting pipe and is connected to the sealed chamber, and a filter element for filtering coal powder is provided in the connecting pipe.
[0015] According to a second aspect of the present disclosure, a coal mill is provided, which includes the tie rod sealing device described above.
[0016] Through the above technical solution, i.e., the tie rod sealing device of the coal mill, the tie rod sealing device forms a new sealing structure at the bottom of the shell on the basis of using the first sealing member to seal the tie rod and the shell, so that when there is a problem of sealing wind and coal powder leakage between the gap between the tie rod and the shell, the leakage of sealing wind and coal powder can be effectively blocked and collected by the tie rod sealing device, thereby improving the sealing reliability between the tie rod and the shell. Specifically, the tie rod sealing device includes a first sealing member arranged between the tie rod and the shell, and also includes a shell, a sealing bag and an accumulator. Among them, the shell, the sealing bag and the tie rod can enclose a sealed chamber at the bottom of the shell, and the accumulator is connected to the sealed chamber. When in use, the tie rod moves upward to compress the sealed chamber and store gas through the accumulator, and the tie rod moves downward to replenish gas into the sealed chamber through the accumulator. The gas pressure in the sealed chamber is greater than the gas pressure in the shell. Therefore, whether the tie rod moves upward or downward, the sealed chamber formed at the bottom of the shell can always maintain a positive pressure state to prevent the sealing wind in the shell from leaking outward from the gap between the shell and the tie rod. In addition, the sealing bag can also collect at least part of the leaked coal powder. Further, the coal mill equipped with the tie rod sealing device can have good operating stability.
[0017] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:
[0019] Figure 1 It is a schematic structural diagram of a tie rod sealing device provided according to an embodiment of the present disclosure.
[0020] Description of Reference Numerals
[0021] 1. Pull rod; 2. Shell; 3. First sealing member; 4. Pull rod sealing device; 41. Shell; 411. Connecting portion; 412. Extension portion; 413. Mounting portion; 42. Sealing bag; 43. Accumulator; 44. Sealing chamber; 45. Flange; 46. First clip; 47. Fixing assembly; 471. Sliding bearing; 48. Second clip; 49. Sealing pad; 50. Elastic assembly; 501. Elastic cylinder; 502. Mounting plate; 51. Safety valve; 52. Connecting pipe; 53. Filter. DETAILED DESCRIPTION
[0022] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.
[0023] In the present disclosure, unless otherwise stated, the directional words used, such as "inside" and "outside", refer to the outline of the corresponding parts themselves. In addition, the terms "first" and "second" used in the present disclosure are to distinguish one element from another element and do not have order and importance. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.
[0024] According to the first aspect of the present disclosure, Figure 1 As shown, a tie rod sealing device 4 of a coal mill is provided. The coal mill may include a tie rod 1 and a shell 2. The tie rod 1 extends outward from the inside of the coal mill through the shell 2. The tie rod sealing device 4 includes a first sealing member 3 arranged between the tie rod 1 and the shell 2. For example, the first sealing member 3 may be a rubber sealing ring, which is not limited here, and those skilled in the art may design it according to actual needs. The tie rod sealing device 4 may also include a shell 41, a sealing bag 42 and an accumulator 43. The shell 41 is sleeved on the tie rod 1, one end of which is connected to the bottom of the shell 2, and the other end extends in the extension direction of the tie rod 1 in a direction away from the shell 2. The sealing bag 42 is sleeved on the tie rod 1 and is located between the shell 41 and the tie rod 1. One end of the sealing bag 42 is connected to the circumferential inner side wall of the shell 41, and the other end is connected to the tie rod 1. The shell 41, the sealing bag 42 and the tie rod 1 form a sealed chamber 44. The accumulator 43 is connected to the sealed chamber 44 and is configured to store gas when the pull rod 1 moves upward to compress the sealed chamber 44. When the pull rod 1 moves downward, gas is added into the sealed chamber 44. The gas pressure in the sealed chamber 44 is greater than the gas pressure in the housing 2.
[0025] Through the above technical solution, the tie rod sealing device 4 can be based on the first sealing member 3 used to seal the tie rod 1 and the housing 2 in the related technology, and a new sealing structure is formed at the bottom of the housing 2, so that when there is a problem of sealing wind and coal powder leakage between the tie rod 1 and the housing 2, the tie rod sealing device 4 can effectively block and collect the leaked sealing wind and coal powder, thereby improving the sealing reliability between the tie rod 1 and the housing 2. Specifically, the tie rod sealing device 4 includes a shell 41, a sealing bag 42 and an accumulator 43. Among them, the shell 41, the sealing bag 42 and the tie rod 1 can enclose a sealed chamber 44 at the bottom of the housing 2, and the accumulator 43 is connected to the sealed chamber 44. When in use, the tie rod 1 moves upward to compress the sealed chamber 44 and store gas through the accumulator 43, and the tie rod 1 moves downward to replenish gas into the sealed chamber 44 through the accumulator 43. The gas pressure in the sealed chamber 44 is greater than the gas pressure in the housing 2. Therefore, whether the pull rod 1 moves upward or downward, the sealed chamber 44 formed at the bottom of the shell 2 can always maintain a positive pressure state to prevent the sealed air in the shell 2 from leaking outward from the gap between the shell 2 and the pull rod 1. In addition, the sealing bag 42 can also collect at least part of the leaked coal powder.
[0026] Optionally, the sealing bag 42 can be made of double-sided silicon-titanium alloy canvas, mainly due to its high strength, wear resistance, tear resistance, durability, etc. Of course, the sealing bag 42 can also be made of other suitable materials, which are not limited here.
[0027] In some embodiments, Figure 1 As shown, the housing 41 is connected to the bottom of the housing 2 through a flange 45. Accordingly, the first seal 3 can be arranged between the flange 45 and the pull rod 1. The first seal 3 and the flange 45 cooperate with each other to form a good sealing effect on the end of the housing 41 close to the housing 2. The method of connecting the housing 41 and the housing 2 using the flange 45 is mainly to utilize the characteristics of the flange 45 that it is easy to connect and disassemble, has high strength, and has good sealing performance. Of course, the housing 41 can also be connected to the housing 2 through other connection methods, which are not limited here, and those skilled in the art can design according to actual needs.
[0028] In some embodiments, the housing 41 includes a connecting portion 411 connected to the bottom of the flange, and an extension portion 412 sleeved on the outside of the connecting portion 411. Accordingly, one end of the sealing bag 42 is connected to the connecting portion 411 through a first clamping member 46, and the other end is connected to the pull rod 1 through a fixing assembly 47. Optionally, the first clamping member 46 can be configured as a throat clamp clamp. The throat clamp clamp is firmly and tightly locked, has a large adjustment range, and has a beautiful appearance after assembly. Of course, the first clamping member 46 can also be selected from other materials such as a connecting plate, etc., which is not limited here, and those skilled in the art can choose according to actual needs. Optionally, the fixing assembly 47 may include a sliding bearing 471 sleeved on the outside of the pull rod 1. The other end of the sealing bag 42 is connected to the sliding bearing 471 through a second clamping member 48. After assembly, the inner side of the sliding bearing 471 can be fixedly connected to the pull rod 1, and the outer side of the sliding bearing 471 can be fixedly connected to the other end of the sealing bag 42 through the second clamping member 48. Furthermore, a sealing gasket 49 may be provided between the sliding bearing 471 and the pull rod 1. In this embodiment, the sliding bearing 471 and the sealing gasket 49 cooperate with each other to form a good sealing effect on the end of the housing 41 away from the shell 2, and cooperate with the flange 45 and the first sealing member 3 mentioned above to form a sealing chamber 44, thereby effectively blocking and collecting the leaked sealing wind and coal powder, thereby improving the sealing reliability between the pull rod 1 and the shell 2.
[0029] In some embodiments, the extension portion 412 extends from one end of the housing 2 toward the side close to the pull rod 1 to form a mounting portion 413. The bottom of the sliding bearing 471 is connected to the mounting portion 413 through an elastic component 50. When the pull rod 1 moves upward to drive the sliding bearing 471 to move upward, the elastic component 50 connected to the bottom of the sliding bearing 471 can form a certain driving force on the sliding bearing 471. The setting of the elastic component 50 improves the stability of the pull rod 1 during movement. As an illustration, the elastic component 50 may include an elastic cylinder 501 and a mounting plate 502. One end of the elastic cylinder 501 is connected to the mounting portion 413, and the other end is connected to the sliding bearing 471 through the mounting plate 502. The setting of the mounting plate 502 can increase the connection area between the sliding bearing 471 and the elastic cylinder 501, and improve the stability of the connection. Of course, the elastic component 50 can also be a plurality of springs arranged at intervals, which is not limited here, and those skilled in the art can design according to actual conditions.
[0030] In some embodiments, the tie rod sealing device 4 may further include a safety valve 51 disposed on the housing 41. The safety valve 51 is used to control the wind pressure inside the sealed chamber 44. The provision of the safety valve 51 improves the safety of the tie rod sealing device 4. The operator can adjust the wind pressure inside the sealed chamber 44 by controlling the opening of the safety valve 51 to avoid safety hazards caused by excessive pressure.
[0031] In some embodiments, the accumulator 43 is connected to the housing 41 through a connecting pipe 52, and a filter 53 for filtering coal powder is provided in the connecting pipe 52. For example, the filter 53 can be a filter, and of course, it can also be other suitable equipment or materials, which is not limited here, and those skilled in the art can choose according to actual needs. The setting of the filter 53 can prevent the coal powder collected in the sealing bag 42 from entering the accumulator 43 through the connecting pipe 52, thereby ensuring the normal and effective operation of the accumulator 43, thereby improving the reliability of the entire tie rod sealing device 4.
[0032] According to a second aspect of the present disclosure, a coal mill is further provided, the coal mill comprising the above-mentioned tie rod sealing device 4. The coal mill equipped with the tie rod sealing device 4 can have good operating stability.
[0033] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.
[0034] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.
[0035] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.
Claims
1. A tie rod sealing device for a coal mill, the coal mill comprising a tie rod and a housing, the tie rod extending outward from the inside of the coal mill through the housing, the tie rod sealing device comprising a first sealing member arranged between the tie rod and the housing, characterized in that: The tie rod sealing device also includes: A shell, which is sleeved on the pull rod, one end of which is connected to the bottom of the shell, and the other end of which extends away from the shell along the extension direction of the pull rod; a sealing bag, which is sleeved on the pull rod and is located between the outer shell and the pull rod, wherein one end of the sealing bag is connected to the circumferential inner side wall of the outer shell, and the other end is connected to the pull rod, and the outer shell, the sealing bag and the pull rod form a sealed chamber; and An accumulator is connected to the sealed chamber, and the accumulator is configured to: store gas when the pull rod moves upward to compress the sealed chamber; and replenish gas into the sealed chamber when the pull rod moves downward; Wherein, the gas pressure in the sealed chamber is greater than the gas pressure in the shell.
2. The tie rod sealing device according to claim 1, characterized in that: The outer shell is connected to the bottom of the housing through a flange.
3. The rod sealing device according to claim 2, characterized in that: The shell includes a connecting portion connected to the bottom of the flange, and an extending portion sleeved on the outside of the connecting portion. One end of the sealing bag is connected to the connecting portion through a first clamping piece, and the other end is connected to the pull rod through a fixing assembly.
4. The rod sealing device according to claim 3, characterized in that: The fixing assembly comprises a sliding bearing sleeved outside the pull rod, and the other end of the sealing bag is connected to the sliding bearing through a second clamping piece.
5. The rod sealing device according to claim 4, characterized in that: A sealing gasket is also arranged between the sliding bearing and the pull rod.
6. The rod sealing device according to claim 4, characterized in that: The extension portion extends from one end of the housing toward a side close to the pull rod to form a mounting portion, and the bottom of the sliding bearing is connected to the mounting portion through an elastic component.
7. The tie rod sealing device according to claim 6, characterized in that: The elastic component comprises an elastic tube and a mounting plate, one end of the elastic tube is connected to the mounting portion, and the other end is connected to the sliding bearing through the mounting plate.
8. The tie rod sealing device according to claim 2, characterized in that: The tie rod sealing device further comprises a safety valve arranged on the housing, and the safety valve is used to control the wind pressure inside the sealing chamber.
9. The tie rod sealing device according to claim 2, characterized in that: The accumulator is connected to the shell through a connecting pipe, and a filter element for filtering coal powder is arranged in the connecting pipe.
10. A coal mill, characterized in that: The invention comprises a tie rod sealing device as claimed in any one of claims 1 to 9.