Roller shaft sealing device for grinding machine
By setting an annular seal and a floating sealing ring structure at the roller shaft of the grinding mill, combined with elastic gaskets and skeleton oil seals, the problem of sealing failure caused by dust is solved, achieving a more efficient sealing effect and ensuring stable operation of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-29
- Publication Date
- 2026-03-10
AI Technical Summary
In existing grinding machines, the rolling bearings suffer from seal failure due to dust particles entering, affecting normal operation.
The system employs annular seals and floating sealing rings, combined with elastic gaskets and skeleton oil seals, to form a multi-layer sealing system that ensures a good seal.
It effectively prevents dust from entering the rolling bearing, improves sealing quality, avoids seal failure due to wear, and ensures stable equipment operation.
Smart Images
Figure CN223984808U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of grinding machine technology, and in particular to a sealing device for grinding machine roller shafts. Background Technology
[0002] Powder manufacturing is a crucial part of modern industry, and with the increasing sophistication of modern industry, the requirements for powder products are constantly rising. Existing powder production lines use ball mills, Raymond mills, and other grinding machines as the main grinding equipment, along with conveyor belts to transport powder products and store them in storage rooms.
[0003] Raymond mill is the most common type of large-scale fine powder grinding equipment. It is widely used for fine powder processing of more than 280 kinds of materials in the mining, chemical and construction industries, such as barite, calcite, potassium feldspar, talc, marble, limestone, dolomite, fluorite, lime, activated clay, activated carbon, bentonite, kaolin, cement, phosphate rock, gypsum, glass, and insulation materials, with a Mohs hardness of no more than 9.3 and a moisture content of less than 6%. The finished particle size of Raymond mill can be adjusted arbitrarily within the range of 80-325 mesh, and some materials can reach up to 600 mesh.
[0004] The Raymond mill mainly consists of a casing, main unit, analyzer, fan, and discharge pipe. The main unit comprises a frame, inlet volute, shovel, grinding rollers, grinding ring, and cover. During operation, the material to be pulverized is fed into the mill through the feed hopper on the side of the cover. The grinding rollers, suspended on the main unit's frame, revolve around the vertical axis while simultaneously rotating on their own axis. Due to centrifugal force during rotation, the grinding rollers swing outwards, pressing tightly against the grinding ring. The shovel scoops up the material and delivers it between the grinding rollers and the grinding ring, where the rolling and crushing action of the grinding rollers achieves the purpose of pulverizing the material.
[0005] The grinding roller device typically uses a vertically mounted roller shaft to drive the grinding roller's rotation. The roller shaft is usually fixed at its top with a bushing, and then fixedly connected to the grinding roller at its bottom. Therefore, a rolling bearing is generally used to connect the roller shaft and the bushing, ensuring that it can only rotate axially. However, the machine's interior is filled with a large amount of fine dust particles from the grinding process. These dust particles can easily enter the rolling bearings, increasing their operating friction. In severe cases, this can affect the normal operation of the rolling bearings, leading to downtime and economic losses. Currently, ordinary oil seals are used to seal the bottom of the rolling bearings. However, in dusty environments, oil seals are also prone to failure due to the large amount of dust particles entering, thus requiring a better sealing device. Utility Model Content
[0006] To address the shortcomings of existing technologies, this utility model provides a sealing device for the roller shaft of a grinding machine, which solves the problem that existing technologies using oil seals to seal rolling bearings are prone to seal failure due to a large amount of dust particles entering the oil seal.
[0007] According to an embodiment of this utility model, a sealing device for a grinding mill roller shaft is provided. The sealing device is configured to cooperate with a bushing and a roller shaft rotatably connected inside the bushing. The bottom end of the bushing is connected to the roller shaft via a rolling bearing. The sealing device is located at the bottom of the rolling bearing, thereby sealing the bottom end of the rolling bearing. The sealing device includes a first sealing element and a fourth sealing element arranged opposite to each other. Both the first sealing element and the fourth sealing element are annular structures. The first sealing element is fixedly installed on the bottom end face of the bushing, and the fourth sealing element is sleeved and fixed outside the roller shaft. A floating sealing ring is provided at the bottom opening of the fourth sealing element and the first sealing element for sealing, thereby forming an annular closed space between the floating sealing ring, the fourth sealing element, and the first sealing element. The closed space is filled with lubricating fluid, and an elastic washer is also provided in the closed space. The elastic washer is positioned on the side of the floating sealing ring closer to the inside of the closed space.
[0008] Furthermore, a second sealing element protruding outward is fixedly provided on the outer side of the fourth sealing element. The height of the second sealing element is lower than the bottom of the first sealing element, so that the top of the second sealing element after extending outward is adjacent to the bottom of the first sealing element. The floating sealing ring is provided on the adjacent end faces of the first sealing element and the second sealing element.
[0009] Furthermore, the floating sealing ring includes a fixed ring, a moving ring, and a floating ring, wherein the fixed ring is fixed to the bottom end face of the first sealing element, the moving ring is fixed to the top end face of the second sealing element, and the floating ring is floatingly disposed between the fixed ring and the moving ring.
[0010] Furthermore, the elastic gasket includes an upper ring and a lower ring arranged side by side, wherein the upper ring is disposed between the fixed ring and the fourth seal, and the lower ring is disposed between the moving ring and the fourth seal. Both the upper and lower rings are bent structures. The top of the upper ring is parallel to the fourth seal and the bottom is inclined toward the floating seal ring. The bottom of the lower ring is parallel to the fourth seal and the top is inclined toward the floating seal ring. The bottom end of the upper ring and the top end of the lower ring are in close contact with each other, and the contact surfaces of the two correspond to the position of the floating ring of the floating seal ring.
[0011] Furthermore, floating oil seals are respectively provided between the fixed ring and the upper ring, and between the moving ring and the lower ring.
[0012] Furthermore, an annular third seal is also fitted and fixed on the outside of the fourth seal. The third seal is located below the second seal, and the top of the third seal is in close contact with the bottom of the second seal, thereby supporting the bottom surface of the second seal.
[0013] Furthermore, the top regions of the first and fourth seals adjacent to the rolling bearing are also provided with skeleton oil seals.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] 1. This utility model provides a first sealing element and a second sealing element at the connection between the bottom end of the bushing and the roller shaft, thereby sealing the bottom end of the rolling bearing. The first sealing element and the second sealing element are respectively connected to the bushing and the roller shaft to form a sealing structure that moves with each other. At the same time, a floating sealing ring is provided at the connection between the two for sealing treatment. In the closed space formed by the first sealing element and the second sealing element, an elastic washer is also provided corresponding to the floating sealing ring. During the assembly process, the assembly preload of the first sealing element and the second sealing element will cause the elastic washer to be squeezed and deformed in the closed space, thereby further completing the sealing of the connection between the first sealing element and the second sealing element and achieving a better sealing effect.
[0016] 2. The elastic gasket in this utility model includes an upper ring and a lower ring arranged side by side. The bottom end of the upper ring and the top end of the lower ring are in close contact with each other, and the contact surfaces of the two rings correspond to the position of the floating ring of the floating sealing ring. Therefore, the pressure on the upper and lower rings causes the end of the upper ring and the lower ring to move towards the floating ring, thereby making close contact with the floating ring. When the floating ring wears down due to long-term operation, the upper and lower rings continue to be in close contact with the floating ring under pressure, preventing the floating ring from having gaps due to wear, which would allow external dust to enter, and further improving the sealing quality. Attached Figure Description
[0017] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.
[0018] Figure 2 for Figure 1 An enlarged schematic diagram of part A in the middle.
[0019] In the above figures: 1. Bushing; 2. Roller shaft; 3. Rolling bearing; 4. First seal; 5. Fourth seal; 6. Second seal; 7. Third seal; 8. Floating sealing ring; 9. Elastic washer; 51. Floating oil seal; 52. Skeleton oil seal; 81. Fixed ring; 82. Moving ring; 83. Floating ring; 91. Upper ring; 92. Lower ring. Detailed Implementation
[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.
[0021] like Figure 1 As shown in the figure, this utility model embodiment proposes a sealing device for a grinding mill roller shaft 2. The sealing device is configured in conjunction with a bushing 1 and a roller shaft 2 rotatably connected inside the bushing 1. The bottom end of the bushing 1 is connected to the roller shaft 2 through a rolling bearing 3. In this embodiment, preferably, the bottom end of the bushing 1 is rotatably connected to the roller shaft 2 through a spherical roller bearing.
[0022] In this embodiment, the sealing device is located at the bottom of the rolling bearing 3 to seal the bottom end of the rolling bearing 3. The sealing device includes a first sealing element 4 and a fourth sealing element 5 arranged opposite each other. Both the first sealing element 4 and the fourth sealing element 5 are annular structures. The first sealing element 4 is fixedly installed on the bottom end face of the bushing 1 by a screw structure. The fourth sealing element 5 is sleeved and fixed to the outside of the roller shaft 2. A floating sealing ring 8 is provided at the bottom opening of the fourth sealing element 5 and the first sealing element 4 for sealing, thereby forming an annular closed space between the floating sealing ring 8, the fourth sealing element 5 and the first sealing element 4. The closed space is filled with lubricating fluid. An elastic washer 9 is also provided in the closed space. The elastic washer 9 is provided on the side of the floating sealing ring 8 closer to the inside of the closed space. During the assembly process, the assembly pre-tightening force of the first sealing element 4 and the second sealing element 6 will cause the elastic washer 9 to be squeezed and deformed in the closed space, thereby further completing the sealing of the connection between the first sealing element 4 and the second sealing element 6 and achieving a better sealing effect.
[0023] In a specific embodiment, a second sealing element 6 protruding outward is fixedly disposed on the outer surface of the fourth sealing element 5. The height of the second sealing element 6 is lower than the bottom of the first sealing element 4, meaning that the second sealing element 6 extends radially from the outside of the fourth sealing element 5 to partially overlap with the first sealing element 4, such that the top end of the second sealing element 6 is adjacent to the bottom end of the first sealing element 4. The floating sealing ring 8 is disposed on the adjacent end faces of the first sealing element 4 and the second sealing element 6. In a further embodiment, a ring-shaped third sealing element 7 is also fixedly sleeved on the outside of the fourth sealing element 5. The third sealing element 7 is located below the second sealing element 6, and the top end of the third sealing element 7 is in close contact with the bottom end of the second sealing element 6, thereby supporting the bottom surface of the second sealing element 6.
[0024] like Figure 2As shown, the floating sealing ring 8 includes a fixed ring 81, a rotating ring 82, and a floating ring 83. The fixed ring 81 is fixed to the bottom end face of the first sealing element 4, the rotating ring 82 is fixed to the top end face of the second sealing element 6, and the floating ring 83 is floatingly disposed between the fixed ring 81 and the rotating ring 82. Correspondingly, the elastic washer 9 includes an upper ring 91 and a lower ring 92 arranged side-by-side. The upper ring 91 is disposed between the fixed ring 81 and the fourth sealing element 5, and the lower ring 92 is disposed between the rotating ring 82 and the fourth sealing element 5. Both the upper ring 91 and the lower ring 92 are bent structures. The top of the upper ring 91 is parallel to the fourth sealing element 5, and the bottom is inclined towards the floating sealing ring 8. The bottom of the lower ring 92 is parallel to the fourth sealing element 5, and the top is inclined towards the floating sealing ring 8. The bottom of the upper ring 91 and the top of the lower ring 92 are in close contact with each other, and their contact surfaces correspond to the position of the floating ring 83 of the floating sealing ring 8.
[0025] When the elastic washer 9 is subjected to the preload of the assembly, it is obvious that the top of the upper ring 91 is stressed, causing its bottom end to press against the floating ring 83 on the outside. Meanwhile, the bottom of the lower ring 92 is stressed, causing its top end to press against the floating ring 83 on the outside. Thus, both the upper and lower rings 91 and 92 simultaneously apply pressure to the floating ring 83, causing it to remain in place under the influence of external air pressure and dust pressure. At the same time, when the floating ring 83 wears down due to prolonged operation, the upper and lower rings 91 and 92 continue to maintain close contact with the floating ring 83 under pressure, preventing gaps caused by wear and allowing external dust to enter, further improving the sealing quality.
[0026] Preferably, floating oil seals 51 are respectively provided between the fixed ring 81 and the upper ring 91, and between the moving ring 82 and the lower ring 92. The floating oil seals 51 are respectively positioned parallel to the fourth sealing element 5 on the upper ring 91 and the lower ring 92, thereby fixing the upper ring 91 and the lower ring 92 to a certain extent and maintaining their pressure direction on the floating ring 83. In addition, skeleton oil seals 52 are also provided in the areas adjacent to the rolling bearing 3 at the top of the first sealing element 4 and the fourth sealing element 5, thereby sealing the gap between the top of the first sealing element 4 and the fourth sealing element 5 and the rolling bearing 3.
[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.
Claims
1. A sealing device for a grinding mill roller shaft, said sealing device being arranged in cooperation with a shaft sleeve and a roller shaft rotatingly connected inside the shaft sleeve, said shaft sleeve bottom end being connected to the roller shaft by means of rolling bearings, characterized in that: The sealing device is arranged at the bottom of the rolling bearing to seal the bottom end of the rolling bearing, and comprises oppositely arranged first and fourth sealing members, both of which are annular structures, wherein the first sealing member is fixedly installed on the end face of the bottom end of the shaft sleeve, and the fourth sealing member is fixedly sleeved on the outside of the roller shaft, and the bottom end opening of the fourth sealing member is provided with a floating sealing ring for sealing, so as to form an annular closed space between the floating sealing ring, the fourth sealing member and the first sealing member, which is filled with lubricating liquid, and an elastic washer is further arranged in the closed space, which is arranged on the side of the floating sealing ring close to the inside of the closed space.
2. A seal for a grinding mill roller shaft as claimed in claim 1 wherein: The second sealing member is fixedly arranged on the outer side of the fourth sealing member and protrudes outward, and the height of the second sealing member is lower than the bottom end of the first sealing member, so that the top end of the second sealing member extends outward and is adjacent to the bottom end of the first sealing member, and the floating sealing ring is arranged on the adjacent end faces of the first and second sealing members.
3. A seal for a grinder roll shaft as defined in claim 2 wherein: The floating sealing ring comprises a fixed ring, a movable ring and a floating ring, wherein the fixed ring is fixed to the bottom end face of the first sealing member, the movable ring is fixed to the top end face of the second sealing member, and the floating ring is floatingly arranged between the fixed ring and the movable ring.
4. A seal for a grinder roll shaft as defined in claim 3 wherein: The elastic washer comprises an upper washer and a lower washer arranged side by side, wherein the upper washer is arranged between the fixed ring and the fourth sealing member, and the lower washer is arranged between the movable ring and the fourth sealing member, both of which are bent structures, the top of the upper washer is parallel to the fourth sealing member, and the bottom is inclined towards the floating sealing ring, the bottom of the lower washer is parallel to the fourth sealing member, and the top is inclined towards the floating sealing ring, the bottom end of the upper washer and the top end of the lower washer are closely attached to each other, and the contact surfaces of the two correspond to the position of the floating ring of the floating sealing ring.
5. A seal for a grinder roll shaft as defined in claim 4 wherein: Floating oil seals are arranged between the fixed ring and the upper washer and between the movable ring and the lower washer.
6. A seal for a grinder roll shaft as defined in claim 1 wherein: The fourth sealing member is further fixedly sleeved with an annular third sealing member, which is located below the second sealing member, and the top end of the third sealing member is in close contact with the bottom end of the second sealing member, so as to support the bottom surface of the second sealing member.
7. A seal for a grinder roll shaft as defined in claim 1 wherein: The top of the first sealing member and the fourth sealing member is further provided with a skeleton oil seal adjacent to the rolling bearing.