Sealing-improved grinding roller device of vertical coal mill

Abstract

A grinding roller is installed on a rotating shaft through a bearing, an oil filling pipe penetrates through the rotating shaft and extends to a positioning sleeve, an oil outlet hole of the positioning sleeve is communicated with the oil filling pipe, a sealing sleeve piece is arranged on the side face of the grinding roller, and a sealing lip is arranged between the sealing sleeve piece and the bearing. A sealing protection assembly is arranged in a first sealing groove of the sealing kit, and a framework oil seal is installed in a second sealing groove and fixed through an end gland. A positioning sealing shaft sleeve is further installed on the outer side of the rotating shaft, a sealing cavity is formed by the positioning sealing shaft sleeve and the gas sealing pipe, and the gas sealing pipe is fixedly installed between the sealing kit and the rocker arm installation base. According to the device, the oil filling pipe extends to the position between the two bearings, sufficient lubrication of the two bearings is guaranteed, nitrogen positive pressure sealing is adopted, pulverized coal is prevented from entering a bearing cavity from a shaft gap, the overall equipment performance of the vertical coal mill is improved through assembly structure optimization and sealing improvement of the grinding roller device, and stable operation of the mill is guaranteed; qualified supply of the pulverized coal for the smelting process is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of grinding roller devices, and in particular to a vertical coal mill grinding roller device with improved sealing. Background Art

[0002] The vertical coal mill of the fuming furnace provides qualified pulverized coal for pyrometallurgical lead smelting processes such as Isa furnace smelting and fuming furnace blowing. During the operation of the mill, there are problems such as excessive wear of the grinding roller. After dismantling the machine for inspection, it was found that the design of the grinding roller device of the mill was unreasonable and the sealing was not tight. It is necessary to optimize the grinding roller device and improve the sealing, and to reasonably repair the grinding roller shaft and roller sleeve.

[0003] The main defects of the grinding roller are: the grinding roller bearings use both lubrication filling holes and nitrogen sealing holes, and the two sets of bearings use one oil pipe to fill oil from one side, which easily causes the other set of bearings to lack oil. At the same time, the filling pipe and the gas sealing pipe are the same pipe. After filling oil, there is grease in the pipe, and ventilation causes grease to block the pipe, resulting in leakage faults such as air and oil leakage in multiple parts, seal failure, pulverized coal entering the bearing cavity, and bearing wear and damage.

[0004] The unreasonable structure of the vertical mill roller leads to oil shortage and damage of the bearing, gas seal failure, shaft and bearing wear, and unreasonable shaft assembly design. Utility Model Content

[0005] In order to solve or partially solve the problems existing in the related technology, the present application provides a vertical coal mill grinding roller device with improved sealing, which optimizes the design and improvement of the grinding roller assembly structure and the sealing device to ensure adequate lubrication of the two sets of bearings, adopts nitrogen positive pressure sealing, and prevents pulverized coal from entering the bearing cavity through the shaft gap.

[0006] The first aspect of the present application provides a vertical coal mill grinding roller device with improved sealing, comprising: a refueling pipe, a gas sealing pipe and a sealing kit, the grinding roller is installed on the rotating shaft through a bearing, the refueling pipe penetrates the rotating shaft and extends to a positioning sleeve, an oil outlet hole is opened on the positioning sleeve and the oil outlet hole is connected to the refueling pipe, a sealing kit for sealing the bearing is arranged on the side of the grinding roller, a sealing lip is arranged between the sealing kit and the bearing, a first sealing groove and a second sealing groove are arranged in the sealing kit, a sealing protection component corresponding to the rotating shaft is arranged in the first sealing groove, a skeleton oil seal is installed in the second sealing groove and the skeleton oil seal is fixed by an end pressure cover; a positioning sealing sleeve is also installed on the outer side of the rotating shaft, the positioning sealing sleeve and the gas sealing pipe form a sealing cavity, and the gas sealing pipe is fixedly installed between the sealing kit and the rocker arm mounting seat.

[0007] Furthermore, the grinding roller is mounted on the rotating shaft through two sets of bearings, and the positioning sleeve is arranged between the two sets of bearings.

[0008] Furthermore, a gas interface is provided on the gas sealing tube, and the gas interface is connected to a compressed nitrogen source.

[0009] Furthermore, the sealing protection assembly includes a countersunk bolt, an elastic steel plate and a wool felt sealing gasket. The skeleton oil seal presses the sealing lip through the elastic steel plate, and a wool felt sealing gasket is arranged on the inner side of the elastic steel plate. The elastic steel plate and the wool felt sealing gasket are fixed and installed by countersunk bolts.

[0010] The technical solution provided by this application may have the following beneficial effects:

[0011] The present application provides a vertical coal mill roller device with improved sealing. The device extends the oil filling pipe between two sets of bearings to ensure that the two sets of bearings are adequately lubricated. Nitrogen positive pressure sealing is adopted to prevent pulverized coal from entering the bearing cavity from the shaft gap. By optimizing the assembly structure and improving the sealing of the roller device, the overall equipment performance of the vertical coal mill is improved, the smooth operation of the mill is guaranteed, and the qualified supply of pulverized coal for the smelting process is ensured.

[0012] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0014] Figure 1 It is a schematic diagram of the structure of the device shown in the embodiment of the present application;

[0015] Figure 2 It is a partial enlarged schematic diagram of the device shown in the embodiment of the present application;

[0016] Reference numerals:

[0017] In the figure, 1 is the oil filling pipe, 2 is the positioning sealing sleeve, 3 is the gas sealing tube, 4 is the sealing kit, 4-1 is the skeleton oil seal, 4-2 is the end pressure cover, 4-3 is the bolt, 5 is the sealing protection assembly, 5-1 is the countersunk bolt, 5-2 is the elastic steel plate, 5-3 is the wool felt sealing gasket, 6 is the positioning sleeve, 7 is the No. 1 bearing, 8 is the No. 2 bearing, 9 is the rotating shaft, 10 is the sealing lip, 11 is the rocker arm mounting seat. DETAILED DESCRIPTION

[0018] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0019] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0020] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0021] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0023] As shown in the figure, the vertical coal mill roller device with improved sealing includes: an oil filling pipe 1, a gas sealing pipe 3 and a sealing kit 4. The roller is installed on the rotating shaft 9 through two sets of bearings. The rotating shaft 9 is a straight shaft. The straight shaft structure is convenient for replacing the skeleton oil seal 4-1. The roller can be replaced by simply pulling it out of the grinding disc. The bearings are No. 1 bearing 7 and No. 2 bearing 8, and a positioning sleeve 6 is installed between the No. 1 bearing 7 and the No. 2 bearing 8.

[0024] The device sets the gas sealing tube 3 and the lubricating oil filling pipe 1 separately. The oil filling pipe 1 passes through the rotating shaft 9 and extends to the positioning sleeve 6. The positioning sleeve 6 is provided with an oil outlet hole, which is connected with the oil filling pipe 1. After refueling, the lubricating oil flows out from the oil outlet hole to lubricate the No. 1 bearing 7 and the No. 2 bearing 8 on both sides to ensure that the two sets of bearings are adequately lubricated.

[0025] A sealing kit 4 for sealing the bearing is arranged on the side of the grinding roller, a sealing lip 10 is arranged between the sealing kit 4 and the bearing, a first sealing groove and a second sealing groove are arranged in the sealing kit 4, a sealing protection assembly 5 corresponding to the rotating shaft 9 is arranged in the first sealing groove, three groups of skeleton oil seals 4-1 are installed in the second sealing groove, and the skeleton oil seals 4-1 are fixed by end glands 4-2 and bolts 4-3. The sealing protection assembly 5 includes a countersunk bolt 5-1, an elastic steel plate 5-2 and a wool felt sealing gasket 5-3, the skeleton oil seal 4-1 is pressed against the sealing lip 10 by the elastic steel plate 5-2, a wool felt sealing gasket 5-3 is arranged on the inner side of the elastic steel plate 5-2, and the elastic steel plate 5-2 and the wool felt sealing gasket 5-3 are fixed and installed by the countersunk bolt 5-1. The design adopts imported high temperature resistant skeleton oil seal 4-1, which is pressed tightly by elastic steel plate 5-2 to seal lip 10, without abrasion to shaft. During maintenance, only skeleton oil seal 4-1 needs to be replaced. A wool felt seal (20mm) is added inside skeleton oil seal 4-1 to form multi-level sealing protection, and oil seal can prevent pulverized coal from entering into bearing cavity.

[0026] A positioning sealing sleeve 2 is installed on the outside of the rotating shaft 9, and the positioning sealing sleeve 2 and the gas sealing tube 3 form a sealed cavity. The gas sealing tube 3 is fixedly installed between the sealing kit 4 and the rocker arm mounting seat 11. A gas interface is provided on the gas sealing tube 3, and the gas interface is connected to a compressed nitrogen source. Nitrogen enters the sealed cavity through the gas interface. The device adopts nitrogen positive pressure sealing to prevent pulverized coal from entering the bearing cavity from the shaft gap.

[0027] The present application provides a vertical coal mill roller device with improved sealing. The device extends the oil filling pipe between two sets of bearings to ensure that the two sets of bearings are adequately lubricated. Nitrogen positive pressure sealing is adopted to prevent pulverized coal from entering the bearing cavity from the shaft gap. By optimizing the assembly structure and improving the sealing of the roller device, the overall equipment performance of the vertical coal mill is improved, the smooth operation of the mill is guaranteed, and the qualified supply of pulverized coal for the smelting process is ensured.

[0028] Finally, it should be noted that, in this article, relationships such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms include, include or any other variations are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0030] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A vertical coal mill roller device with improved sealing, characterized in that: include: A refueling pipe, a gas sealing pipe and a sealing kit, the grinding roller is installed on the rotating shaft through the bearing, the refueling pipe passes through the rotating shaft and extends to the positioning sleeve, the positioning sleeve is provided with an oil outlet hole and the oil outlet hole is connected with the refueling pipe, the side of the grinding roller is provided with a sealing kit for sealing the bearing, a sealing lip is provided between the sealing kit and the bearing, a first sealing groove and a second sealing groove are provided in the sealing kit, a sealing protection component corresponding to the rotating shaft is provided in the first sealing groove, a skeleton oil seal is installed in the second sealing groove and the skeleton oil seal is fixed by an end pressure cover; a positioning sealing sleeve is also installed on the outside of the rotating shaft, the positioning sealing sleeve and the gas sealing pipe form a sealing cavity, and the gas sealing pipe is fixedly installed between the sealing kit and the rocker arm mounting seat.

2. The vertical coal mill roller device according to claim 1, characterized in that: The grinding roller is mounted on the rotating shaft through two sets of bearings, and the positioning sleeve is arranged between the two sets of bearings.

3. The vertical coal mill grinding roller device according to claim 1, characterized in that: The gas sealing tube is provided with a gas interface, and the gas interface is connected to a compressed nitrogen source.

4. The vertical coal mill grinding roller device according to claim 1, characterized in that: The sealing protection assembly includes a countersunk bolt, an elastic steel plate and a wool felt sealing gasket. The skeleton oil seal presses the sealing lip through the elastic steel plate, and the wool felt sealing gasket is arranged on the inner side of the elastic steel plate. The elastic steel plate and the wool felt sealing gasket are fixedly installed by the countersunk bolt.

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