Grinding roller assembly for Raymond mill / overhang roller mill

Abstract

The utility model relates to a grinding roller assembly for Raymond mill / overhang roller mill, which sequentially comprises a grinding roller shaft frame, a grinding roller fixing frame and a grinding roller shaft from outside to inside, the grinding roller fixing frame can circumferentially rotate relative to the grinding roller shaft frame and the grinding roller shaft, the end part of the grinding roller fixing frame extends into the end part of the grinding roller shaft frame, the end face of the grinding roller fixing frame is provided with a lip-shaped sealing ring, and the lip-shaped sealing ring is connected with the grinding roller shaft frame. The lip-shaped sealing ring is in sealing fit with the grinding roller shaft; the peripheral surface of the grinding roller fixing frame is also provided with a piston ring sealing support ring and a labyrinth sealing groove, the piston ring sealing support ring and the labyrinth sealing groove are in sealing fit with the inner wall surface of the grinding roller shaft frame, and the sealing grade of the labyrinth sealing groove is lower than the sealing grade of the piston ring sealing support ring in a working state; and the piston ring sealing support ring is closer to the end part of the grinding roller fixing frame. Three seals are arranged, so that external dust can be prevented from entering an internal oil pool to pollute oil liquid, and the internal oil liquid can be prevented from leaking outwards. Therefore, the grinding roller assembly is not easy to damage, has long service life and does not need to be frequently maintained.

Description

Technical Field

[0001] The utility model relates to the field of pulverization, in particular to a grinding roller assembly used for a Raymond mill / suspension roller mill. Background Art

[0002] Raymond mill / suspension roller mill is a common grinding equipment, which is widely used in high-fine powder grinding and processing in metallurgy, building materials, chemical industry, mining and other industries. The grinding roller assembly is the most important grinding device in the Raymond mill / suspension roller mill and plays an important role. The traditional grinding roller assembly is lubricated by grease, with a short maintenance cycle, time-consuming and labor-intensive maintenance, and the seal used is prone to failure. Therefore, it is urgent to improve the structure of the grinding roller assembly in the prior art. Utility Model Content

[0003] The utility model aims to provide a grinding roller assembly for Raymond mill / suspension roller mill to solve the technical problems of short maintenance period and easy failure of sealing of the grinding roller assembly in the prior art.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A grinding roller assembly for a Raymond mill / suspension roller mill comprises, from outside to inside, a grinding roller shaft frame, a grinding roller fixing frame and a grinding roller shaft, the grinding roller fixing frame can rotate circumferentially relative to the grinding roller shaft frame and the roller shaft, the end of the grinding roller fixing frame extends into a recessed groove opened at the end of the grinding roller shaft frame, a lip sealing ring is arranged on the end surface of the grinding roller fixing frame, and the lip sealing ring is sealed with the grinding roller shaft; an expansion ring sealing support ring and a labyrinth sealing groove are also arranged on the outer peripheral surface of the grinding roller fixing frame, the expansion ring sealing support ring and the labyrinth sealing groove are sealed with the inner wall surface of the grinding roller shaft frame, the sealing level of the labyrinth sealing groove is lower than the sealing level of the expansion ring sealing support ring when the grinding roller assembly is started; compared with the labyrinth sealing groove, the expansion ring sealing support ring is closer to the end of the grinding roller fixing frame.

[0006] Furthermore, an end face groove is processed on the upper end face of the grinding roller fixing frame, and the lip sealing ring is arranged in the end face groove.

[0007] Furthermore, the grinding roller fixing frame is cylindrical, the inner end of the end face groove passes through the inner wall of the grinding roller fixing frame, the outer ring of the lip sealing ring is tightly attached to the side wall of the end face groove, the lip is pressed on the outer wall surface of the grinding roller shaft, and the end is tightly attached to the bottom of the end face groove.

[0008] Furthermore, a circumferential surface annular groove is arranged on the outer circumferential surface of the grinding roller fixing frame, and the expansion ring sealing support ring is arranged in the circumferential surface annular groove.

[0009] Furthermore, the width of the circumferential annular groove is greater than the width of the expansion ring sealing support ring. Under normal circumstances, a gap is left between the side surface of the expansion ring sealing support ring and the side wall of the annular groove. When the grinding roller assembly is working and high pressure is generated inside the grinding roller fixing frame, the side surface of the expansion ring sealing support ring is pressed against the side wall of the annular groove.

[0010] Furthermore, a recessed groove is provided on the inner wall surface of the grinding roller shaft frame which cooperates with the labyrinth sealing groove.

[0011] Furthermore, the depth of the sink is 0.5mm-1mm.

[0012] Furthermore, the labyrinth sealing groove is a radial labyrinth sealing groove.

[0013] Furthermore, a gap is left between the middle of the grinding roller fixing frame and the grinding roller shaft, and the gap is used to store oil to form an oil pool.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model is provided with three seals, which can prevent external dust from entering the internal oil pool to pollute the oil, and can also prevent the internal oil from leaking out. The lip seal ring cooperates with the grinding roller shaft dynamic seal through the lip. When working, the expansion ring seal support ring is pressed against the side wall of the peripheral ring groove and returns to its original position when the temperature drops. The labyrinth seal groove with a relatively low sealing level is conducive to improving the service life of the sealing structure, ensuring that the grinding roller assembly of the utility model is not easily damaged, has a long service life, and does not require frequent maintenance.

[0016] When the roller assembly is working, the lubricating oil heats up and forms a high-pressure chamber above the expansion ring seal support ring. The high-pressure chamber presses the expansion ring seal support ring against the side wall of the peripheral ring groove and increases the sealing level. According to the relevant theories of fluid dynamics, at this time, external dust cannot enter the interior of the roller holder through the high-pressure chamber. When the roller assembly stops working, as the temperature gradually decreases, the chamber pressure between the expansion ring seal support ring and the lip seal ring will gradually decrease. After the pressure decreases, the side of the expansion ring seal support ring no longer presses the side wall of the peripheral ring groove but creates a small distance from it. The chamber between the expansion ring seal support ring and the lip seal ring is connected to the small chamber above the radial labyrinth seal groove. The airflow outside the roller holder can establish a microcirculation with the upper space of the expansion ring seal support ring after filtering the dust through the radial labyrinth seal groove, ensuring that the roller assembly can still establish a high-pressure chamber with sealing effect above the expansion ring seal support ring when it works next time.

[0017] The parts not involved in the device are the same as the existing technology or can be implemented by using the existing technology. The utility model has a scientific and reasonable structure, is safe and convenient to use, and provides great help to people. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 This is a schematic structural diagram of a grinding roller assembly for a Raymond mill / suspension roller mill according to the utility model;

[0020] Figure 2 It is a local enlarged schematic diagram of point A;

[0021] Figure 3 It is a partial enlarged schematic diagram of point B;

[0022] In the figure: 1. Grinding roller shaft frame; 2. Lip seal ring; 3. Grinding roller fixing frame; 4. Expansion ring seal support ring; 5. Radial labyrinth seal groove; 6. Grinding roller shaft; 7. Grinding roller transverse axis; 8. Oil pool. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only 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 creative work are within the scope of protection of the utility model.

[0024] An embodiment of a grinding roller assembly for a Raymond mill / suspension roller mill according to the utility model:

[0025] The specific structure of a grinding roller assembly for a Raymond mill / suspension roller mill in this embodiment is as follows: Figure 1 As shown, it includes a grinding roller shaft frame 1, a grinding roller fixing frame 3, a grinding roller shaft 6 and a grinding roller transverse axis 7. The grinding roller shaft frame 1 is connected to the grinding roller transverse axis 7, fixed on the grinding roller hanger and rotated with the main shaft of the main machine. The grinding roller shaft 6 is fixedly installed in the grinding roller shaft frame 1.

[0026] exist Figure 1 In the direction shown, the upper half of the roller frame 1 is tightly matched with the roller shaft 6, the lower half of the roller frame 1 has a larger inner diameter and leaves an annular gap with the outer wall of the roller shaft 6, and the upper end of the roller fixing frame 3 is inserted into the annular gap at the lower end of the roller frame 1. The roller fixing frame 3 and the roller frame 1 are in a relative rotation relationship in the circumferential direction, and the roller fixing frame 3 and the roller shaft 6 are also in a relative rotation relationship in the circumferential direction. The oil pool for storing thin oil is located between the roller fixing frame 3 and the roller shaft 6. Specifically, the middle section of the roller fixing frame 3 has a larger inner diameter and leaves a gap with the inner wall of the roller shaft 6, and oil is stored in the gap to form an oil pool 8.

[0027] An end face groove is processed on the upper end face of the grinding roller fixing frame 3, and the inner end of the end face groove passes through the inner wall of the grinding roller fixing frame 3. A lip seal ring 2 is arranged in the end face groove, and the opening of the lip seal ring 2 is arranged upward. The outer ring is pressed against the side wall of the end face groove, the lip is pressed against the outer wall surface of the grinding roller shaft, and the lower end is pressed against the groove bottom of the end face groove. The lip seal ring 2 forms a dynamic seal with the grinding roller shaft 6. Since the lower end of the lip seal ring 2 is pressed against the groove bottom of the end face groove, the gas between the grinding roller fixing frame 3 and the grinding roller shaft 6 can flow to between the grinding roller fixing frame 3 and the grinding roller shaft frame 1 through the lip seal ring 2, but the gas between the grinding roller fixing frame 3 and the grinding roller shaft frame 1 cannot flow to between the grinding roller fixing frame 3 and the grinding roller shaft 6 through the lip seal ring 2. Therefore, the lip seal ring 2 can prevent the oil in the oil pool 8 from flowing out, and on the other hand, it substantially acts as a one-way valve in terms of blocking gas.

[0028] A circumferential ring groove is arranged on the outer circumferential surface of the grinding roller fixing frame 3, and the circumferential ring groove is opened on the shaft section where the grinding roller fixing frame 3 and the grinding roller shaft frame 1 match. An expansion ring sealing support ring 4 is arranged in the circumferential ring groove, and forms a static sealing matching relationship with the inner wall surface of the grinding roller shaft frame 1. The width of the circumferential ring groove is larger than the width of the expansion ring sealing support ring 4. Under normal circumstances, a small gap will be left between the side surface of the expansion ring sealing support ring 4 and the two side walls of the circumferential ring groove so that the airflow above and below the expansion ring sealing support ring 4 can circulate; when the grinding roller assembly is working and the oil temperature in the oil pool increases, the air pressure in the grinding roller fixing frame 3 increases, and the lower side surface of the expansion ring sealing support ring 4 is pressed against the lower side wall surface of the circumferential ring groove (such as Figure 2 As shown), the high-pressure gas is blocked from diffusing outwards.

[0029] A radial labyrinth seal groove 5 is also provided on the outer circumference of the roller fixing frame 3. The radial labyrinth seal groove 5 is located on the shaft section where the roller fixing frame 3 and the roller shaft frame 1 match, and is located below the expansion ring seal support ring 4. The radial labyrinth seal groove 5 forms a labyrinth seal with the inner wall of the roller shaft frame 1. The radial labyrinth seal groove 5 prevents external dust from diffusing into the oil pool.

[0030] The radial labyrinth seal groove 5 refers to a seal groove that spirals and extends along the circumference of the grinding roller fixing frame 3. In other embodiments, the radial labyrinth seal groove can also be replaced by a labyrinth seal groove with other directions. The working principle of the labyrinth seal groove is that the fluid passes through a channel composed of many throttling gaps and expansion cavities, and after multiple throttling, a large energy loss is generated, and the fluid pressure head is greatly reduced, making it difficult for the fluid to leak, so as to achieve the purpose of sealing. The specific structural design of the labyrinth seal groove belongs to the prior art and will not be repeated in this application.

[0031] When the roller assembly is working, the roller holder 3 rotates continuously, the lubricating oil heats up and forms a high-pressure chamber above the expansion ring seal support ring 4, at which time external dust cannot enter the interior of the roller holder 3 through the high-pressure chamber. Through the two sealing structures of the lip seal 2 and the expansion ring seal support ring 4, the oil inside the roller holder 3 will not leak out.

[0032] The sealing level of the radial labyrinth seal groove 5 is lower than the sealing level of the expansion ring seal support ring 4 after it expands. When the grinding roller assembly stops working, as the temperature gradually decreases, the pressure in the chamber between the expansion ring seal support ring 4 and the lip seal ring 2 will gradually decrease. After the pressure is reduced, the side of the expansion ring seal support ring 4 retracts to a small distance from the side wall of the peripheral ring groove, and the chamber between the expansion ring seal support ring 4 and the lip seal ring 2 is connected to the small chamber above the radial labyrinth seal groove 5. The airflow outside the grinding roller fixing frame 3 can establish a microcirculation with the upper space of the expansion ring seal support ring 4 after filtering the dust through the radial labyrinth seal groove 5, ensuring that the grinding roller assembly can still establish a high-pressure chamber with a sealing effect above the expansion ring seal support ring 4 when it works next time.

[0033] In the present application, a groove is provided on the inner wall surface of the grinding roller shaft frame 1 and the radial labyrinth seal groove 5 on the grinding roller fixing frame 3, and the depth of the groove is 0.5mm-1mm. In this gap state, the radial labyrinth seal groove 5 can not only play a dust-proof role, but also ensure that the air after preliminary dust removal can enter the upper space of the expansion ring seal support ring 4 to establish a high-pressure chamber in the working state.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A grinding roller assembly for Raymond mill / suspension roller mill, characterized in that: From outside to inside, it includes a grinding roller shaft frame, a grinding roller fixing frame and a grinding roller shaft. The grinding roller fixing frame can rotate circumferentially relative to the grinding roller shaft frame and the roller shaft. The end of the grinding roller fixing frame extends into a recessed groove opened at the end of the grinding roller shaft frame. A lip sealing ring is arranged on the end surface of the grinding roller fixing frame, and the lip sealing ring is sealed with the grinding roller shaft; an expansion ring sealing support ring and a labyrinth sealing groove are also arranged on the outer peripheral surface of the grinding roller fixing frame, and the expansion ring sealing support ring and the labyrinth sealing groove are sealed with the inner wall surface of the grinding roller shaft frame, and the sealing level of the labyrinth sealing groove is lower than the sealing level of the expansion ring sealing support ring when the grinding roller assembly is started; compared with the labyrinth sealing groove, the expansion ring sealing support ring is closer to the end of the grinding roller fixing frame.

2. The grinding roller assembly for Raymond mill / suspension roller mill according to claim 1, characterized in that: An end face groove is processed on the upper end face of the grinding roller fixing frame, and the lip sealing ring is arranged in the end face groove.

3. The grinding roller assembly for Raymond mill / suspension roller mill according to claim 2, characterized in that: The grinding roller fixing frame is cylindrical, the inner end of the end face groove passes through the inner wall of the grinding roller fixing frame, the outer ring of the lip-shaped sealing ring is tightly attached to the side wall of the end face groove, the lip is pressed on the outer wall surface of the grinding roller shaft, and the end is tightly attached to the bottom of the end face groove.

4. The grinding roller assembly for Raymond mill / suspension roller mill according to claim 1, characterized in that: A peripheral ring groove is arranged on the outer peripheral surface of the grinding roller fixing frame, and the expansion ring sealing support ring is arranged in the peripheral ring groove.

5. The grinding roller assembly for Raymond mill / suspension roller mill according to claim 4, characterized in that: The width of the circumferential annular groove is greater than the width of the expansion ring sealing support ring. Under normal circumstances, a gap is left between the side surface of the expansion ring sealing support ring and the side wall of the annular groove. When the grinding roller assembly is working and high pressure is generated inside the grinding roller fixing frame, the side surface of the expansion ring sealing support ring is pressed against the side wall of the annular groove.

6. The grinding roller assembly for Raymond mill / suspension roller mill according to claim 1, characterized in that: A recessed groove is provided on the inner wall surface of the grinding roller shaft frame which matches the labyrinth sealing groove.

7. The grinding roller assembly for Raymond mill / suspension roller mill according to claim 6, characterized in that: The depth of the sinking groove is 0.5mm-1mm.

8. The grinding roller assembly for Raymond mill / suspension roller mill according to claim 1, characterized in that: The labyrinth sealing groove is a radial labyrinth sealing groove.

9. A grinding roller assembly for a Raymond mill / suspension roller mill according to any one of claims 1 to 8, characterized in that: A gap is left between the middle of the grinding roller fixing frame and the grinding roller shaft, and the gap is used to store oil to form an oil pool.

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