Compensated medium speed coal mill pull rod sealing device
By designing a compensable medium-speed coal mill tie rod sealing device, and using specially made rubber parts and PTFE sealing guide sleeves, the problems of poor sealing performance and short service life of medium-speed coal mill tie rods have been solved, achieving long-cycle sealing and convenient maintenance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGXI DATANG INTERNATIONAL FUZHOU POWER GENERATION CO LTD
- Filing Date
- 2025-07-11
- Publication Date
- 2026-07-21
AI Technical Summary
The tie rod seal of medium-speed coal mill has poor performance and short service life, and is prone to air and dust leakage, leading to environmental pollution and the risk of spontaneous combustion of coal accumulation.
The compensable medium-speed coal mill tie rod sealing device is adopted, including an upper sealing component and a lower sealing component. It uses special rubber parts and PTFE sealing guide sleeves to form elastic contact. The sealing housing can swing with the tie rod. It is designed as a split structure for easy installation and disassembly.
It achieves long-term sealing compensation performance, reduces tie rod wear, prevents material accumulation, maintains sealing effect, and facilitates equipment maintenance.
Smart Images
Figure CN224533474U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medium-speed coal mill tie rod sealing technology, and more specifically, to a compensable medium-speed coal mill tie rod sealing device. Background Technology
[0002] Medium-speed coal mills are the main grinding equipment in industry, and are widely used in power generation, cement and building materials, metallurgy and other industries.
[0003] Currently, most tie rod seals in medium-speed coal mills use metal structures, which are rigid. These older tie rod seals, entirely made of metal, lack elastic compensation capabilities. During long-term operation, the tie rod seal rubs against the vertical movement of the tie rod, gradually wearing down. When this wear reaches a certain level, it leads to poor sealing and powder leakage. Furthermore, this type of metal seal relies primarily on sealing air to maintain its seal, resulting in persistent air leakage during operation. Therefore, older tie rod seals are prone to air and powder leakage; leaks in coal mill tie rod seals directly cause environmental pollution and pose a risk of spontaneous combustion of coal, significantly disrupting production. Due to the large amount of tie rod sway in medium-speed coal mills, the performance and lifespan of tie rod seals currently on the market are unsatisfactory, making it difficult to achieve long-term sealing.
[0004] Therefore, based on the operating principle of medium-speed coal mills and the actual operating conditions of tie rods, it is urgent to develop a compensable tie rod sealing device for medium-speed coal mills to solve the problems of poor sealing performance and short service life of tie rods in medium-speed coal mills. Summary of the Invention
[0005] The technical problem this invention aims to solve is the poor performance and short lifespan of the tie rod seal in medium-speed coal mills.
[0006] To solve the above-mentioned technical problems, this utility model provides a compensable medium-speed coal mill tie rod sealing device, which includes an upper sealing assembly and a lower sealing assembly. The upper sealing assembly includes: a sealing seat, which is sleeved on the medium-speed coal mill tie rod for fixing and installing the upper sealing assembly; a sealing connection part, which is sleeved on the medium-speed coal mill tie rod and has a protrusion at the lower part, which is engaged in the sealing seat; a guide sleeve, which maintains a gap between the sealing connection part and the medium-speed coal mill tie rod for setting the guide sleeve; a sealing shell, which is sleeved on the medium-speed coal mill tie rod and has the sealing connection part extending upward to engage with the sealing shell; and a first sealing core, which is sleeved on the medium-speed coal mill tie rod and has a cavity between the sealing shell and the medium-speed coal mill tie rod for engaging the first sealing core. The top of the first sealing core protrudes from the upper part of the sealing shell and has a conical structure to prevent material accumulation.
[0007] According to an embodiment of the present invention, a circumferential groove may be provided on the inner surface of the first sealing core close to the tie rod of the medium-speed coal mill.
[0008] According to an embodiment of this utility model, there may be three grooves to reduce the friction between the first sealing core and the medium-speed coal mill tie rod, and to ensure the sealing effect.
[0009] According to an embodiment of this utility model, the first sealing core may be made of rubber.
[0010] According to an embodiment of this utility model, a cavity can be retained between the sealing shell and the medium-speed coal mill tie rod, which is radially larger at the bottom and smaller at the top, to hold the first sealing core in place.
[0011] According to an embodiment of this utility model, the guide sleeve may be made of polytetrafluoroethylene (PTFE).
[0012] According to an embodiment of the present invention, the first sealing core and the guide sleeve can be designed with circumferential openings so that they can be directly pried open and fitted onto the pull rod when periodically replaced, facilitating installation and disassembly.
[0013] According to an embodiment of this utility model, the sealing shell and sealing seat can be designed with a half-open shape, which is convenient for installation. During installation, the screws can be directly inserted and tightened.
[0014] According to an embodiment of the present invention, the lower sealing assembly may include: a first clamping plate, a second clamping plate, a sealing chamber, and a second sealing core.
[0015] According to an embodiment of this utility model, the second sealing core may be made of rubber.
[0016] Compared with the prior art, the technical solution provided by the embodiments of this utility model can achieve at least the following beneficial effects:
[0017] The compensable medium-speed coal mill tie rod sealing device of this utility model uses a specially made rubber part as the sealing body, with inner and outer sealing devices. The rubber seal can withstand high temperature of 180℃ and has good wear resistance, while forming elastic contact to reduce wear on the tie rod. The rubber sealing core on the tie rod and the PTFE sealing guide sleeve form a radial sealing form. The sealing shell can swing with the tie rod in the horizontal direction. The sealing shell is a split design and can be disassembled at will. The top of the seal is designed with a conical structure to prevent material accumulation. The lower part of the tie rod seal uses an integral rubber seal, which forms elastic contact after installation to compensate for gaps. The movable sealing chamber of the tie rod allows the rubber sealing core to swing freely within a certain range.
[0018] The compensable medium-speed coal mill tie rod sealing device of this utility model can maintain long-term sealing compensation performance, has a simple structural design, and its split and open design facilitates equipment maintenance and replacement. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only involve some embodiments of this utility model, and are not intended to limit this utility model.
[0020] Figure 1 This is a schematic diagram of the upper sealing assembly according to an embodiment of the present invention;
[0021] Figure 2 This is a schematic diagram of the lower sealing assembly according to an embodiment of the present invention. Detailed Implementation
[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the described embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0023] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a limitation of quantity, but rather indicate the presence of at least one.
[0024] Figure 1 This is a schematic diagram of the upper sealing assembly according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the lower sealing assembly according to an embodiment of the present invention.
[0025] like Figure 1 and Figure 2 As shown, the compensable medium-speed coal mill tie rod sealing device includes an upper sealing assembly and a lower sealing assembly. The upper sealing assembly includes: a sealing seat 1, a sealing connection part 2, a guide sleeve 3, a sealing shell 4, and a first sealing core 5.
[0026] The sealing seat 1 is fitted onto the tie rod of the medium-speed coal mill for fixing and installing the upper sealing assembly; the sealing connection part 2 is fitted onto the tie rod of the medium-speed coal mill, with a protrusion at the bottom, which is engaged in the sealing seat 1; a gap is maintained between the sealing connection part 2 and the tie rod of the medium-speed coal mill for setting the guide sleeve 3; the sealing housing 4 is fitted onto the tie rod of the medium-speed coal mill, and the sealing connection part 2 extends upward to engage with the sealing housing 4.
[0027] The first sealing core 5 is fitted onto the tie rod of the medium-speed coal mill. A cavity is maintained between the sealing housing 4 and the tie rod to hold the first sealing core 5 in place. The top of the first sealing core 5 protrudes beyond the upper part of the sealing housing 4, and the top of the first sealing core 5 has a conical structure to prevent material accumulation.
[0028] According to one or more embodiments of the present invention, a circumferential groove is provided on the inner surface of the first sealing core 5 close to the tie rod of the medium-speed coal mill.
[0029] According to one or more embodiments of the present invention, there are three grooves to reduce the friction between the first sealing core 5 and the medium-speed coal mill tie rod, and to ensure the sealing effect.
[0030] According to one or more embodiments of the present invention, the first sealing core 5 is made of rubber.
[0031] According to one or more embodiments of the present invention, the cavity between the sealing shell 4 and the medium-speed coal mill tie rod is radially larger at the bottom and smaller at the top, so as to hold the first sealing core 5 in place.
[0032] According to one or more embodiments of the present invention, the guide sleeve 3 is made of polytetrafluoroethylene.
[0033] According to one or more embodiments of the present invention, the first sealing core 5 and the guide sleeve 3 are designed with circumferential openings so that they can be directly pried open and fitted onto the pull rod when periodically replaced, facilitating installation and disassembly.
[0034] According to one or more embodiments of this utility model, the sealing shell 4 and the sealing seat 1 are designed with a half-open shape, which is convenient for installation. During installation, the screws can be directly inserted and tightened.
[0035] According to one or more embodiments of the present invention, the lower sealing assembly includes: a first clamping plate 6, a second clamping plate 7, a sealing chamber 8, and a second sealing core 9.
[0036] According to one or more embodiments of the present invention, the second sealing core 9 is made of rubber.
[0037] According to this utility model, the compensable medium-speed coal mill tie rod sealing device uses a specially made rubber part as the sealing body, with inner and outer sealing devices. The rubber seal can withstand high temperatures of 180℃ and has good wear resistance, while forming elastic contact to reduce wear on the tie rod. The rubber sealing core on the tie rod and the PTFE sealing guide sleeve 3 form a radial sealing form. The sealing shell 4 can swing with the tie rod in the horizontal direction. The sealing shell 4 is a split design and can be disassembled at will. The top of the seal is designed with a conical structure to prevent material accumulation. The lower part of the tie rod seal uses an integral rubber seal, which forms elastic contact after installation to compensate for gaps. The movable sealing chamber 8 of the tie rod allows the rubber sealing core to swing freely within a certain range.
[0038] like Figure 1 The diagram shows a compensable sealing device on the tie rod of a medium-speed coal mill, consisting of a specially made rubber sealing core, a PTFE sealing guide sleeve 3, a sealing housing 4, and a sealing seat 1. The sealing device uses the specially made rubber sealing core as the main sealing element, which directly contacts the tie rod to form a seal. The PTFE sealing guide sleeve 3 ensures that the compressive force on the rubber core seal does not exceed limits during the movement of the tie rod. The combination of the specially made rubber sealing core and the PTFE sealing guide sleeve 3 allows the rubber seal to maintain elastic compensation over a long period without exceeding the stress limit. Both the specially made rubber sealing core and the PTFE sealing guide sleeve 3 are open designs, allowing them to be easily pried open and fitted onto the tie rod for periodic replacement. The sealing housing 4 and the top cover of the sealing seat 1 are designed with a semi-open shape, allowing for direct screw tightening during installation. During use, the sealing housing 4 can swing radially within the sealing seat 1, compensating for the impact of radial movement of the tie rod. The top of the seal is designed with a conical structure to prevent material accumulation.
[0039] like Figure 2 The diagram shows a compensable medium-speed coal mill tie rod lower sealing device, which consists of a specially made rubber second sealing core 9, a first clamping plate 6, and a second clamping plate 7. This sealing device uses two integral specially made rubber sealing cores as the main sealing components. After installation, they form elastic contact, which can compensate for gaps and reduce wear on the tie rod. The movable sealing chamber 8 of the tie rod allows the rubber sealing core to swing freely within a certain range, meeting the sealing requirements during the operation of the medium-speed coal mill.
[0040] The compensable medium-speed coal mill tie rod sealing device of this utility model can maintain long-term sealing compensation performance, has a simple structural design, and its split and open design facilitates equipment maintenance and replacement.
[0041] The above description is merely an exemplary embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. The scope of protection of the present utility model is determined by the appended claims.
Claims
1. A compensable medium-speed coal mill tie rod sealing device, characterized in that, It includes an upper sealing assembly and a lower sealing assembly, wherein the upper sealing assembly includes: A sealing seat, which is sleeved on the tie rod of the medium-speed coal mill, is used to fix and install the upper sealing assembly; A sealing connection part is sleeved on the tie rod of the medium-speed coal mill, and has a protrusion at the lower part, which is engaged in the sealing seat; A guide sleeve is provided, with a gap maintained between the sealing connection and the medium-speed coal mill tie rod for the purpose of installing the guide sleeve. A sealing housing is sleeved on the tie rod of a medium-speed coal mill, and the sealing connection extends upward and engages with the sealing housing. The first sealing core is sleeved on the tie rod of the medium-speed coal mill. A cavity is reserved between the sealing shell and the tie rod of the medium-speed coal mill for securing the first sealing core. The top of the first sealing core protrudes from the upper part of the sealing housing, and the top of the first sealing core has a conical structure to prevent material accumulation.
2. The compensable medium-speed coal mill tie rod sealing device as described in claim 1, characterized in that, The first sealing core has a circumferential groove on the inner surface of the medium-speed coal mill tie rod.
3. The compensable medium-speed coal mill tie rod sealing device as described in claim 2, characterized in that, There are three grooves to reduce the friction between the first sealing core and the medium-speed coal mill tie rod, and to ensure the sealing effect.
4. The compensable medium-speed coal mill tie rod sealing device as described in claim 1, characterized in that, The first sealing core is made of rubber.
5. The compensable medium-speed coal mill tie rod sealing device as described in claim 1, characterized in that, The cavity between the sealing shell and the medium-speed coal mill tie rod is radially larger at the bottom and smaller at the top, so as to hold the first sealing core in place.
6. The compensable medium-speed coal mill tie rod sealing device as described in claim 1, characterized in that, The guide sleeve is made of polytetrafluoroethylene.
7. The compensable medium-speed coal mill tie rod sealing device as described in claim 1, characterized in that, The first sealing core and the guide sleeve are designed with circumferential openings so that they can be directly pried open and fitted onto the pull rod for periodic replacement, facilitating installation and disassembly.
8. The compensable medium-speed coal mill tie rod sealing device as described in claim 1, characterized in that, The sealing housing and the sealing seat are designed with a split opening for easy installation; during installation, simply insert screws and tighten them.
9. The compensable medium-speed coal mill tie rod sealing device as described in claim 1, characterized in that, The lower sealing assembly includes: a first clamping plate, a second clamping plate, a sealing chamber, and a second sealing core.
10. The compensable medium-speed coal mill tie rod sealing device as described in claim 9, characterized in that, The second sealing core is made of rubber.