Novel sealing structure for grinding roller assembly of Raymond mill

Abstract

The utility model discloses a novel sealing structure of a Raymond mill grinding roller assembly, which comprises a grinding roller shaft arranged in a grinding roller sleeve through an upper bearing component and a lower bearing component, a gland corresponding to the bearing component in a limiting manner is arranged at the lower port of the grinding roller sleeve, and a sealing ring group for preventing dust from entering the bearing component is arranged in the gland. A grinding roller is mounted at the end part of the grinding roller shaft extending out of the lower port of the grinding roller sleeve; the grinding roller shaft between the gland and the grinding roller is sleeved and fixedly provided with a static ring plate and a rotating ring plate, the static ring plate is connected with the gland through a static sleeve, the bottom of the static ring plate is provided with more than two layers of static isolation sleeves from inside to outside, and the top of the rotating ring plate is provided with more than two layers of rotating isolation sleeves from inside to outside; the static isolation sleeve and the rotating isolation sleeve are inserted in a staggered mode, and a zigzag air channel is formed between the two isolation sleeves to prevent dust from entering the sealing ring set.

Description

Technical Field

[0001] This utility model relates to the structure of grinding mill components, specifically a novel sealing structure for a Raymond mill grinding roller assembly. Background Technology

[0002] In the Raymond mill structure, the grinding roller assembly is the component that crushes and grinds the material. It is mainly composed of grinding roller shaft, grinding roller sleeve, grinding roller, bearing, oil seal, clamping nut and other parts. During the crushing process, the grinding roller assembly rotates at high speed to crush the material and collides with the material continuously. The working conditions are harsh, so the reliability requirements of the oil seal (protecting the bearing) are very high.

[0003] In existing technologies, bearing protection typically employs a combination of lip seals and floating oil seals.

[0004] Because floating oil seals have high requirements for the machining accuracy and installation process of the parts they work with, it is difficult to achieve the ideal sealing effect if these requirements are not met. In practical applications, floating oil seals often have poor reliability, with the sealing ring failing and powder entering, ultimately leading to bearing seizure. Furthermore, floating oil seals are more expensive than lip seals, require a higher level of technical expertise from installers, and are time-consuming and labor-intensive to replace, affecting maintenance efficiency. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model proposes a novel sealing structure for Raymond mill grinding roller assemblies that offers high reliability, low maintenance costs, and high maintenance efficiency.

[0006] A novel sealing structure for Raymond mill grinding roller assemblies, capable of solving existing technical problems, includes a grinding roller shaft mounted within a grinding roller sleeve via upper and lower bearing assemblies. A pressure cap corresponding to the bearing assembly is installed at the lower end of the grinding roller sleeve. The pressure cap contains a sealing ring assembly to prevent dust from entering the bearing assembly. A grinding roller is mounted on the end of the grinding roller shaft extending outside the lower end of the grinding roller sleeve. The difference lies in:

[0007] A stationary ring plate and a rotating ring plate are fitted and fixed on the grinding roller shaft between the pressure cap and the grinding roller. The stationary ring plate is connected to the pressure cap through a stationary sleeve. The bottom of the stationary ring plate is provided with two or more layers of stationary isolation sleeves from the inside out. The top of the rotating ring plate is provided with two or more layers of rotating isolation sleeves from the inside out. The stationary isolation sleeves and the rotating isolation sleeves are staggered and inserted to form a tortuous air passage between the two isolation sleeves to prevent dust from entering the sealing ring assembly.

[0008] Furthermore, the sealing ring assembly preferably adopts a double-layer lip sealing ring.

[0009] The beneficial effects of this utility model are:

[0010] Compared to the traditional sealing method of floating oil seals, the tortuous air passage sealing structure in this invention can more effectively prevent dust from entering the gland and corroding the sealing ring assembly, thereby damaging the bearing assembly. The structure is simple and effective, highly reliable, easy to process and assemble, and can effectively reduce manufacturing and maintenance costs, and extend the service life of the equipment. Attached Figure Description

[0011] Figure 1 This is a first-view isometric view of one embodiment of the present invention.

[0012] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0013] Part Number Identification: 1. Bearing assembly; 2. Grinding roller sleeve; 3. Grinding roller shaft; 4. Grinding roller; 5. Pressure cap; 6. Stationary ring plate; 7. Rotating ring plate; 8. Stationary sleeve; 9. Stationary isolation sleeve; 10. Rotating isolation sleeve; 11. Protective sleeve; 12. Locking nut I; 13. Roller core; 14. Pressure plate; 15. Locking nut II; 16. Sealing ring assembly. Detailed Implementation

[0014] The technical solution of this utility model will be further described below with reference to the embodiments shown in the accompanying drawings.

[0015] This utility model discloses a novel sealing structure for a Raymond mill grinding roller assembly. It includes a grinding roller shaft 3 coaxially mounted within a grinding roller sleeve 2 via upper and lower bearing assemblies 1. During operation, the grinding roller shaft 3 rotates freely within the grinding roller sleeve 2. A pressure cap 5, which limits the lower bearing assembly 1, is coaxially mounted at the lower end of the grinding roller sleeve 3 using a bolt assembly. The pressure cap 5 contains a sealing ring assembly 16 that seals the corresponding position on the grinding roller shaft 3. The sealing ring assembly 16 employs a double-layer lip seal to prevent dust from entering the lower bearing assembly 1. A grinding roller 4 is coaxially mounted on the end of the grinding roller shaft 3 extending outside the lower end of the grinding roller sleeve 2. Figure 1 As shown.

[0016] A stationary ring plate 6 and a rotating ring plate 7 are fitted onto the grinding roller shaft 3 between the pressure cap 5 and the grinding roller 4. The stationary ring plate 6 is coaxially fitted and fixed to the lower end of the stationary sleeve 8, and the stationary sleeve 8 is coaxially fitted onto the grinding roller shaft 3. The upper end of the stationary sleeve 8 is fixedly connected to the bottom of the pressure cap 5. The bottom of the rotating ring plate 7 is axially limited on the axial step of the grinding roller shaft 3. Two locking nuts I12 are screwed onto the grinding roller shaft 3 to press the rotating ring plate 7 downwards. Figure 1 As shown.

[0017] Four layers of isolation sleeves, coaxially fitted from the inside out, are provided between the stationary ring plate 6 and the rotating ring plate 7. The first and third layers of isolation sleeves are fixedly installed on the rotating ring plate 7 to form the rotating isolation sleeve 10 (rotating with the grinding roller shaft 3). The diameter of the first layer of isolation sleeve is larger than that of the locking nut I12 and is at the same height as the two locking nuts I12. A gap is maintained between the third layer of isolation sleeve and the stationary ring plate 6. The second and fourth layers of isolation sleeves are fixedly installed at the bottom of the stationary ring plate 6 to form the stationary isolation sleeve 9. A gap is maintained between the second and fourth layers of isolation sleeves and the rotating ring plate 7. Figure 1 , Figure 2 As shown.

[0018] The stationary isolation sleeve 9 and the rotating isolation sleeve 10 are misaligned to form a tortuous air passage between the two isolation sleeves. This tortuous air passage connects at the annular cavity B to the gap air passage formed between the stationary sleeve 8 and the grinding roller shaft 3. For dust to enter the double-layer lip seal ring inside the pressure cap 5, it must first pass through the tortuous air passage and reach the annular cavity B. At this point, the dust's momentum is almost completely exhausted, and it settles at the annular cavity B. Even if a small amount of dust manages to break through the tortuous air passage and enter the gap air passage, due to the height of the gap air passage, the leaked dust will fall back to the annular cavity B due to loss of momentum. Therefore, this effectively prevents dust from entering the double-layer lip seal ring inside the pressure cap 5. Figure 2 As shown.

[0019] The grinding roller 4 is installed in the following manner:

[0020] The grinding roller 4 is coaxially mounted on the lower end of the grinding roller shaft 3 via the roller core 13. A protective sleeve 11 is coaxially mounted on the grinding roller shaft 3 between the grinding roller 4 and the rotating ring plate 7. A pressure plate 14 is coaxially mounted on the grinding roller shaft 3 at the bottom of the grinding roller 4. Two locking nuts II 15 are screwed onto the grinding roller shaft 3 at the bottom of the pressure plate 14. Tightening the locking nuts II 15 locks the grinding roller 4 onto the grinding roller shaft 3 between the protective sleeve 11 and the pressure plate 14. Figure 1 As shown.

Claims

1. A novel sealing structure for a Raymond mill grinding roller assembly, comprising a grinding roller shaft (3) installed within a grinding roller sleeve (2) via upper and lower bearing assemblies (1), wherein a pressure cap (5) corresponding to the bearing assembly (1) is installed at the lower end of the grinding roller sleeve (2), and a sealing ring assembly (16) is provided inside the pressure cap (5) to prevent dust from entering the bearing assembly (1), and a grinding roller (4) is installed on the end of the grinding roller shaft (3) extending outside the lower end of the grinding roller sleeve (2), characterized in that: A stationary ring plate (6) and a rotating ring plate (7) are fitted and fixed on the grinding roller shaft (3) between the pressure cap (5) and the grinding roller (4). The stationary ring plate (6) is connected to the pressure cap (5) through a stationary sleeve (8). The bottom of the stationary ring plate (6) is provided with two or more layers of stationary isolation sleeves (9) from the inside out. The top of the rotating ring plate (7) is provided with two or more layers of rotating isolation sleeves (10) from the inside out. The stationary isolation sleeves (9) and the rotating isolation sleeves (10) are staggered and inserted to form a tortuous air passage between the two isolation sleeves to prevent dust from entering the sealing ring assembly (16).

2. The novel sealing structure of the Raymond mill roller assembly according to claim 1, characterized in that: The sealing ring assembly (16) is a double-layer lip seal ring.

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