Bearing chock sealing device and mill

Abstract

This invention discloses a bearing housing sealing device and a mill. The bearing housing sealing device includes a sealing cover module and an oil collection assembly. The sealing cover module is fitted onto a drive shaft and seals the inner cavity of the bearing housing at the sealing end. The sealing cover module has an oil return hole on the lower side of the drive shaft that communicates with the inner cavity of the bearing housing. The oil collection assembly is located in the inner cavity of the bearing housing and includes an oil slinger ring and an oil baffle. The oil slinger ring is fixedly fitted onto the drive shaft near the gap between the sealing cover module and the drive shaft. The oil baffle extends around the oil slinger ring on the upper side of the drive shaft. The upper end of the oil baffle is connected to the sealing cover module, and the lower end has a first oil collection groove formed on the side facing the sealing cover module. The first oil collection groove has a first oil outlet on the outer side of the oil slinger ring. Thus, it not only has the sealing function of the sealing cover module, but also the drainage function of the oil collection assembly. The combination of the two can improve the reliability of the thin oil seal and effectively prevent thin oil leakage.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery technology, and in particular relates to a bearing housing sealing device and a mill. Background Technology

[0002] Currently, grinding mills, used for crushing and grinding various ores, are widely used in industries such as metallurgy, building materials, chemicals, and mineral processing. The core rotating component of the grinding mill, the drive shaft, bears the crucial responsibility of transmitting power from the motor to the grinding mechanism. Under high-speed, heavy-load, and continuous operation conditions, the reliable sealing of the drive shaft's bearings and journals is one of the decisive factors in ensuring the long-term stable operation of the mill.

[0003] As mills develop towards larger size, higher speed, and higher load, the drawbacks of grease sealing have become increasingly apparent. Compared to grease, thin oil has significant advantages such as better fluidity, higher heat dissipation efficiency, stronger cleaning ability, and the ability to quickly penetrate into tiny gaps to form a continuous oil film. Therefore, thin oil sealing has become a more advanced sealing solution that better meets the operating requirements of modern mill equipment.

[0004] However, in practical applications, the technical difficulty of implementing thin oil seals is significantly higher than that of grease seals, and they generally face problems such as insufficient sealing reliability and easy lubricating oil leakage. Therefore, how to effectively solve the increased sealing difficulty while making full use of the advantages of thin oil seals, such as good heat dissipation and high cleanliness, is a technical problem that urgently needs to be solved in the field of mill drive shaft sealing technology. Summary of the Invention

[0005] To address the aforementioned defects or deficiencies, this invention provides a bearing housing sealing device and a mill, aiming to solve the technical problems of insufficient sealing reliability and easy lubricating oil leakage when using thin oil seals.

[0006] To achieve the above objectives, the first aspect of the present invention provides a bearing housing sealing device, wherein the bearing housing sealing device includes a sealing cover module and an oil collection assembly; the sealing cover module is fitted onto a drive shaft and seals the inner cavity of the bearing housing at the sealing end of the bearing housing, and the sealing cover module is provided with an oil return hole communicating with the inner cavity of the bearing housing on the lower side of the drive shaft; the oil collection assembly is located in the inner cavity of the bearing housing and includes an oil slinger ring and an oil baffle, the oil slinger ring is fixedly fitted onto the drive shaft near the gap between the sealing cover module and the drive shaft, the oil baffle extends around the oil slinger ring on the upper side of the drive shaft, the upper end of the oil baffle is connected to the sealing cover module, and the lower end forms a first oil collection groove on the side facing the sealing cover module, and the first oil collection groove forms a first oil outlet on the outer side of the oil slinger ring.

[0007] In one embodiment of the present invention, the oil slinger ring includes a sealing section and an oil slinger section arranged sequentially along the axial direction of the drive shaft. The sealing section is placed between the drive shaft and the sealing cover module and forms a non-contact sealing structure with the sealing cover module. The oil slinger section extends into the inner cavity of the bearing seat, and the outer peripheral side of the oil slinger section is opposite to and spaced apart from the oil baffle.

[0008] In one embodiment of the present invention, the non-contact sealing structure is configured as a first labyrinth sealing structure, and the first labyrinth sealing structure is configured to extend axially along the drive shaft.

[0009] In one embodiment of the present invention, the outer peripheral side of the oil-slinging section has a pointed head that protrudes radially.

[0010] In one embodiment of the present invention, the sealing cover module includes a sealing pressure cover assembly and a sealing end cover assembly. The sealing pressure cover assembly is placed at the sealing end of the bearing housing and includes a first pressure cover, a second pressure cover, and a contact seal. The first pressure cover and the second pressure cover are respectively disposed on the upper and lower sides of the drive shaft and are both connected to the bearing housing. The contact seal and the sealing section are sequentially disposed between the sealing pressure cover assembly and the drive shaft along the axial direction of the drive shaft. The second pressure cover is provided with an oil return hole. The sealing end cover assembly is fitted onto the drive shaft and the sealing cover is disposed on the outside of the sealing pressure cover assembly.

[0011] In one embodiment of the present invention, the second pressure cap is further provided with a first oil return channel with both ends open. The upper end of the first oil return channel is connected to the end of the non-contact sealing structure near the contact seal, and the lower end is connected to the inner cavity of the bearing seat.

[0012] In one embodiment of the present invention, the second pressure cap is further provided with a second oil return channel with both ends open. The upper end of the second oil return channel is guided to contact the side of the sealing member away from the oil slinger ring, and the lower end is connected to the inner cavity of the bearing seat. The lower end of the first oil return channel is guided to the second oil return channel so as to be connected to the inner cavity of the bearing seat through the second oil return channel.

[0013] In one embodiment of the present invention, the second oil return channel is inclined downward along the direction of the sealing end cap assembly toward the second pressure cap, and the lower end of the second oil return channel penetrates the side of the second pressure cap toward the inner cavity of the bearing seat to form a third oil outlet. The first oil return channel is vertically arranged above the second oil return channel and its lower end is connected to the second oil return channel.

[0014] In one embodiment of the present invention, the upper end of the second oil return channel penetrates the mating surface of the second pressure cap and the sealing end cap assembly. The sealing end cap assembly is provided with a third oil return channel on the lower side of the drive shaft. The upper end of the third oil return channel is connected to the gap between the sealing end cap assembly and the drive shaft, and the lower end is connected to the upper end of the second oil return channel.

[0015] In one embodiment of the present invention, the oil baffle includes a connecting plate, an oil baffle plate, and a first groove plate. The connecting plate is attached to the sealing cover module. The oil baffle plate is inclined from the connecting plate away from the sealing cover module in a top-to-bottom direction. The first groove plate is located on the side of the oil baffle plate facing the sealing cover module. The lower end of the first groove plate is connected to the lower end of the oil baffle plate, and the upper end of the first groove plate is spaced apart from the oil baffle plate, so that a first oil collection groove with a first oil outlet at both ends is formed between the first groove plate and the oil baffle plate.

[0016] In one embodiment of the present invention, the oil baffle further includes a second groove plate, which is located on the side of the oil baffle plate away from the sealing cover module. The lower end of the second groove plate is connected to the lower end of the oil baffle plate, and the upper end of the second groove plate is spaced apart from the oil baffle plate, so as to form a second oil collection groove with a second oil outlet at both ends between the second groove plate and the oil baffle plate.

[0017] In one embodiment of the present invention, the sealing end cap assembly includes an end cap body and a labyrinth sealing ring. The end cap body is fitted onto the drive shaft and is sealed on the outside of the sealing cap assembly. The labyrinth sealing ring is fixedly fitted onto the drive shaft on the side of the end cap body away from the sealing cap assembly, and a second labyrinth sealing structure is formed between the labyrinth sealing ring and the end cap body. The end cap body is provided with a grease filling hole that communicates with the second labyrinth sealing structure.

[0018] In one embodiment of the present invention, the second labyrinth seal structure extends radially along the drive shaft.

[0019] In one embodiment of the present invention, the sealing end cap assembly further includes an oil-absorbing sealing ring press-fitted onto the end cap body. The oil-absorbing sealing ring seals the outer end of the second labyrinth sealing structure, and the oil-absorbing sealing ring is a felt sealing ring.

[0020] In one embodiment of the present invention, the end cap body has a first stop boss portion that extends into the space between the sealing cover assembly and the drive shaft and presses against the sealing member.

[0021] In one embodiment of the present invention, the contact seal is configured as a skeleton oil seal; and / or, both the first and second glands are provided with a stop fit structure between them and the bearing housing.

[0022] To achieve the above objectives, a second aspect of the present invention provides a mill, wherein the mill includes a bearing housing sealing device according to the above description.

[0023] Through the above technical solution, the bearing housing sealing device provided by the present invention has the following beneficial effects: When the above-mentioned bearing housing sealing device is used, it includes a sealing cover module and an oil collection assembly. The sealing cover module is fitted onto the drive shaft and seals the inner cavity of the bearing housing at the sealing end. The sealing cover module has an oil return hole on the lower side of the drive shaft that communicates with the inner cavity of the bearing housing. The oil collection assembly is located in the inner cavity of the bearing housing and includes an oil slinger ring and an oil baffle. The oil slinger ring is fixedly fitted onto the drive shaft near the gap between the sealing cover module and the drive shaft, so that when the drive shaft rotates, the thin oil leakage at the gap can be treated by slinging oil. The oil slingered on the lower side of the drive shaft falls directly to the bottom of the inner cavity of the bearing housing and is collected through the oil return hole. The oil slingered on the upper side of the drive shaft is stopped by the oil baffle and flows into the first oil collection groove along the wall of the oil baffle. Since the first oil collection groove forms a first oil outlet on the outside of the oil slinger ring, the thin oil collected in the first oil collection groove can fall directly from the first oil outlet to the bottom of the inner cavity of the bearing housing and then be collected through the oil return hole. In this way, it not only has the sealing function of the sealing cap module, but also the drainage function of the oil collection component. The combination of the two can improve the reliability of the thin oil seal and effectively prevent thin oil leakage.

[0024] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. Those skilled in the art can obtain other drawings based on the structures shown in these drawings without any inventive effort. In the drawings: Figure 1 This is a schematic diagram of the structure of a bearing housing sealing device according to an embodiment of the present invention; Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 3 yes Figure 1 Enlarged view of point B in the middle; Figure 4 This is a schematic diagram of the structure of an oil baffle according to an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures: 100. Sealing cap module; 200. Sealing gland assembly; 210. First gland; 220. Second gland; 221. Oil return hole; 222. First oil return channel; 223. Second oil return channel; 2231. Third oil outlet; 230. Contact seal; 240. Second sealing ring; 300. Sealing end cap assembly; 310. End cap body; 311. Third oil return channel; 312. Grease filling hole; 313. First stop boss; 320. Labyrinth sealing ring; 321. Second labyrinth sealing structure; 322. Fifth fastener; 323. Fourth sealing ring; 330. Third sealing ring; 340. Suction... 350. Oil seal ring; 400. Pressure plate; 410. Oil collection assembly; 411. Oil slinger ring; 411. Sealing section; 4111. First labyrinth seal structure; 412. Oil slinger section; 4121. Pointed head; 413. First fastener; 414. First seal ring; 420. Oil baffle; 421. Connecting plate; 422. Oil baffle plate; 423. First groove plate; 424. First oil collection groove; 4241. First lower oil port; 425. Second groove plate; 426. Second oil collection groove; 4261. Second lower oil port; 500. Bearing seat; 600. Drive shaft; 700. Bearing body; 800. Locking nut; 900. Snap ring. Detailed Implementation

[0027] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0028] The bearing housing sealing device and mill of the present invention are described below with reference to the accompanying drawings.

[0029] like Figures 1 to 4 As shown, the present invention provides a bearing housing sealing device, wherein the bearing housing sealing device includes: The sealing cover module 100 is fitted onto the drive shaft 600 and seals the inner cavity of the bearing housing 500 at the sealing end of the bearing housing 500. The sealing cover module 100 has an oil return hole 221 on the lower side of the drive shaft 600 that communicates with the inner cavity of the bearing housing 500. The oil collection assembly 400 is located in the inner cavity of the bearing housing 500 and includes an oil slinger ring 410 and an oil baffle 420. The oil slinger ring 410 is fixedly fitted onto the drive shaft 600 near the gap between the sealing cover module 100 and the drive shaft 600. The oil baffle 420 extends around the oil slinger ring 410 on the upper side of the drive shaft 600. The upper end of the oil baffle 420 is connected to the sealing cover module 100, and the lower end forms a first oil collection groove 424 on the side facing the sealing cover module 100. The first oil collection groove 424 forms a first oil outlet 4241 on the outer side of the oil slinger ring 410.

[0030] When using the above-mentioned bearing housing sealing device, since it includes a sealing cover module 100 and an oil collection assembly 400, the sealing cover module 100 is fitted onto the drive shaft 600 and seals the inner cavity of the bearing housing 500 at the sealing end. The sealing cover module 100 has an oil return hole 221 on the lower side of the drive shaft 600 that communicates with the inner cavity of the bearing housing 500. The oil collection assembly 400 is located in the inner cavity of the bearing housing 500 and includes an oil slinger ring 410 and an oil baffle 420. The oil slinger ring 410 is fixedly fitted onto the drive shaft 600 near the gap between the sealing cover module 100 and the drive shaft 600, so that when the oil returns to the bearing housing, the oil return hole 221 communicates with the inner cavity of the bearing housing 500. When the drive shaft 600 rotates, it can handle the leakage of thin oil at the gap. The oil spun from the lower side of the drive shaft 600 falls directly to the bottom of the inner cavity of the bearing housing 500 and is collected through the oil return hole 221. The oil spun from the upper side of the drive shaft 600 is stopped by the oil baffle 420 and flows along the wall of the oil baffle 420 into the first oil collection groove 424 for collection. Since the first oil collection groove 424 forms a first oil outlet 4241 on the outside of the oil spun ring 410, the thin oil collected in the first oil collection groove 424 can fall directly from the first oil outlet 4241 to the bottom of the inner cavity of the bearing housing 500 and then be collected through the oil return hole 221. In this way, not only is there the sealing function of the sealing cover module 100, but also the drainage function of the oil collection assembly 400. The combination of the two can improve the reliability of the thin oil seal and effectively prevent thin oil leakage.

[0031] Specifically, the bearing housing 500 is provided with a thin oil filling hole for adding thin oil to lubricate the bearing in the inner cavity of the bearing housing 500. The oil return hole 221 can be connected to the hydraulic system on the equipment. The bearing body 700 is installed on the drive shaft 600 in the inner cavity of the bearing housing 500 by a retaining ring 900 and a locking nut 800. The oil slinger ring 410 is fitted onto the drive shaft 600 and fixedly connected to the drive shaft 600 by a first fastener 413. A first sealing ring 414 is provided between the oil slinger ring 410 and the drive shaft 600. The first fastener 413 includes, but is not limited to, a screw, and the first sealing ring 414 includes, but is not limited to, a rubber sealing ring.

[0032] See Figures 1 to 3In one embodiment of the present invention, the oil slinger ring 410 includes a sealing section 411 and an oil slinger section 412 arranged sequentially along the axial direction of the drive shaft 600. The sealing section 411 is placed between the drive shaft 600 and the sealing cover module 100 and forms a non-contact sealing structure with the sealing cover module 100. The oil slinger section 412 extends into the inner cavity of the bearing seat 500, and the outer peripheral side of the oil slinger section 412 is opposite to and spaced apart from the oil baffle 420. Specifically, the upward-facing side of the oil slinger section 412 is opposite to and spaced apart from the oil baffle 420. The oil slinger ring 410 not only has an oil slinger section 412 that extends into the inner cavity of the bearing housing 500 and can perform oil slinging operations, but also a sealing section 411 that directly intervenes between the drive shaft 600 and the sealing cover module 100. The sealing section 411 and the sealing cover module 100 form a non-contact sealing structure, which allows a seal to be formed between the sealing cover modules 100. This allows the oil slinger ring 410 to increase the resistance to thin oil leakage between the drive shaft 600 and the sealing cover module 100 while rotating with the drive shaft 600.

[0033] In one embodiment of the present invention, the non-contact sealing structure is a first labyrinth seal structure 4111, which extends axially along the drive shaft 600. The first labyrinth seal structure 4111 forms a tortuous sealing channel by providing alternating axially arranged protrusions and grooves between the outer peripheral wall of the sealing section 411 and the inner peripheral wall of the sealing cover module 100. This effectively extends the leakage path of the thin oil, increases flow resistance, and further improves the sealing effect. Of course, the present invention is not limited to this; the non-contact sealing structure can also be a gap seal structure or a spiral seal structure, etc.

[0034] In one embodiment of the present invention, a pointed head 4121 is radially protruding from the outer periphery of the oil-throwing section 412. The pointed head 4121 enhances the oil-throwing function. Specifically, the oil-throwing ring 410 is provided with a plurality of protruding teeth at intervals along the axial direction of the drive shaft 600. The protruding teeth on the sealing section 411 can form a first labyrinth seal structure 4111 with the groove on the inner peripheral wall of the sealing cover module 100 to increase the resistance to oil leakage. The tips of the protruding teeth on the oil-throwing section 412 can form a pointed head 4121, which can rotate with the drive shaft 600 to more efficiently throw the thin oil toward the first oil collection groove 424 of the oil baffle 420, thereby improving the oil-throwing efficiency.

[0035] Please see again Figures 1 to 3In one embodiment of the present invention, the sealing cover module 100 includes a sealing cover assembly 200 and a sealing end cover assembly 300. The sealing cover assembly 200 is placed at the sealing end of the bearing housing 500 and includes a first cover 210, a second cover 220, and a contact seal 230. The first cover 210 and the second cover 220 are respectively disposed on the upper and lower sides of the drive shaft 600 and are both connected to the bearing housing 500. That is, the first cover 210 is located on the upper side of the drive shaft 600, and the second cover 220 is located on the lower side of the drive shaft 600. The first cover 210 and the second cover 220 can be assembled into a ring shape and are both connected to the bearing housing 500 by a second fastener. This split design facilitates the installation and maintenance of the contact seal 230 and the oil slinger ring 410. At the same time, the contact seal 230 and the sealing section 411 are arranged sequentially along the axial direction of the drive shaft 600 between the sealing gland assembly 200 and the drive shaft 600. The contact seal 230 can be a skeleton oil seal, with its lip in close contact with the drive shaft 600, forming a contact-type sealing barrier. This works in conjunction with the non-contact sealing structure formed by the sealing section 411 to form a multi-layered sealing barrier. The second pressure cap 220 is provided with an oil return hole 221, which is located at the bottom of the inner cavity of the bearing housing 500. This allows the thin oil that falls into the bottom of the inner cavity of the bearing housing 500 to flow back to the hydraulic system through the oil return hole 221 on the second pressure cap 220. The sealing end cap assembly 300 is fitted on the drive shaft 600 and the sealing cap is located on the outside of the sealing pressure cap assembly 200. This can protect the sealing pressure cap assembly 200 and further prevent external dust and impurities from entering the inner cavity of the bearing housing 500, as well as prevent the internal thin oil from leaking outward.

[0036] In addition, a second sealing ring 240 may be provided between the two caps of the sealing cap assembly 200 and the bearing seat 500, and a third sealing ring 330 may be provided between the end cap body 310 of the sealing end cap assembly 300 and the two caps of the sealing cap assembly 200. The end cap body 310 may be connected to the two caps of the sealing cap assembly 200 respectively by a third fastener.

[0037] See Figure 1 and Figure 3 In one embodiment of the present invention, the second pressure cap 220 is further provided with a first oil return channel 222, which is open at both ends. The upper end of the first oil return channel 222 is connected to the end of the non-contact sealing structure near the contact seal 230, and the lower end is connected to the inner cavity of the bearing housing 500. When a small amount of thin oil breaks through the non-contact sealing structure, it can enter the upper opening of the first oil return channel 222, and then flow downward along the channel, eventually flowing back to the inner cavity of the bearing housing 500, further preventing leakage.

[0038] In one embodiment of the present invention, the second pressure cap 220 is further provided with a second oil return channel 223, which is open at both ends. The upper end of the second oil return channel 223 guides the contact seal 230 to the side away from the oil slinger ring 410, and the lower end communicates with the inner cavity of the bearing housing 500. The lower end of the first oil return channel 222 is guided to the second oil return channel 223, so as to communicate with the inner cavity of the bearing housing 500 through the second oil return channel 223. If the contact seal 230 leaks a little, the leaked thin oil will be collected by the second oil return channel 223 and flow back to the inner cavity of the bearing housing 500 through its lower end, forming supplementary protection for the contact seal 230. At the same time, by connecting the second oil return channel 223 with the first oil return channel 222, only one third oil outlet 2231 needs to be formed on the second pressure cap 220.

[0039] In one embodiment of the present invention, the second oil return channel 223 is inclined downward along the direction from the sealing end cap assembly 300 toward the second pressure cap 220, and the lower end of the second oil return channel 223 penetrates the side of the second pressure cap 220 toward the inner cavity of the bearing seat 500 to form a third oil outlet 2231. This inclined design utilizes gravity to promote the flow of thin oil, making it easier for it to flow to the third oil outlet 2231. At the same time, the first oil return channel 222 is vertically arranged above the second oil return channel 223 and its lower end is connected to the second oil return channel 223. The vertically arranged first oil return channel 222 can accelerate the return speed of thin oil.

[0040] In one embodiment of the present invention, the upper end of the second oil return channel 223 penetrates the mating surface of the second pressure cap 220 and the sealing end cap assembly 300. The sealing end cap assembly 300 has a third oil return channel 311 on the lower side of the drive shaft 600. The upper end of the third oil return channel 311 communicates with the gap between the sealing end cap assembly 300 and the drive shaft 600, and the lower end communicates with the upper end of the second oil return channel 223. By adding the third oil return channel 311, the channel for solving the leakage of the contact seal 230 is moved outward, so that the thin oil leaking between the sealing end cap assembly 300 and the drive shaft 600 can be recovered. Therefore, if a very small amount of thin oil passes through the contact seal 230 and enters the gap between the sealing end cap assembly 300 and the drive shaft 600, it will be collected by the third oil return channel 311, then flow into the second oil return channel 223 through its lower end, and finally return through the third oil outlet 2231, forming a complete oil return path from the sealing end cap assembly 300 to the sealing gland assembly 200. Furthermore, when the second oil return channel 223 is inclined downwards along the direction from the sealing end cap assembly 300 toward the second gland 220, the third oil return channel 311 can be coaxial with the second oil return channel 223.

[0041] See Figure 1 , Figure 2 and Figure 4In one embodiment of the present invention, the oil baffle 420 includes a connecting plate 421, an oil baffle 422, and a first groove plate 423. The connecting plate 421 is fitted onto the sealing cap module 100. Specifically, the connecting plate 421 can be shaped like a semi-flange plate and is fixedly connected to the first pressure cap 210 in the sealing cap module 100 by a plurality of fourth fasteners to ensure that the oil baffle 420 is installed securely. The oil baffle 422 is inclined from the connecting plate 421 away from the sealing cap module 100 in the direction from top to bottom. The inclination angle of the oil baffle 422 can be designed according to the actual oil splashing situation to more effectively receive the oil splashed from the upper side of the oil splashing ring 410. The first groove plate 423 is located on the side of the oil baffle plate 422 facing the sealing cover module 100, and the lower end of the first groove plate 423 is connected to the lower end of the oil baffle plate 422, and the upper end of the first groove plate 423 is spaced apart from the oil baffle plate 422, so that a first oil collection groove 424 with a first oil outlet 4241 at both ends is formed between the first groove plate 423 and the oil baffle plate 422. The width and depth of the first oil collection groove 424 can also be optimized according to the expected oil collection volume to ensure that the collected thin oil can flow smoothly from the first oil outlet 4241 at both ends and flow to the bottom of the inner cavity of the bearing seat 500, avoiding the oil slinger ring 410 on the drive shaft 600.

[0042] In one embodiment of the present invention, the oil baffle 420 further includes a second groove plate 425. The second groove plate 425 is located on the side of the oil baffle plate 422 away from the sealing cover module 100, and the lower end of the second groove plate 425 is connected to the lower end of the oil baffle plate 422, and the upper end of the second groove plate 425 is spaced apart from the oil baffle plate 422, so that a second oil collecting groove 426 with a second oil outlet 4261 at both ends is formed between the second groove plate 425 and the oil baffle plate 422. The second oil collecting groove 426 can collect a small amount of thin oil that may splash from the side of the oil baffle plate 422 away from the first groove plate 423, further improving the oil collection efficiency and preventing thin oil from scattering randomly. The second oil outlet 4261 can guide the collected thin oil to the bottom of the inner cavity of the bearing seat 500, and the oil is returned through the oil return hole 221. Understandably, the thin oil, under certain pressure, will splash within the bearing housing 500 cavity. Some thin oil will splash onto the upper wall of the oil baffle plate 422. This portion of thin oil can flow along the side of the oil baffle plate 422 away from the sealing cover module 100 to the second oil collection groove 426, and then flow to the bottom of the bearing housing 500 cavity through the second oil outlets 4261 at both ends.

[0043] Please see again Figures 1 to 3In one embodiment of the present invention, the sealing end cap assembly 300 includes an end cap body 310 and a labyrinth sealing ring 320. The end cap body 310 is fitted onto the drive shaft 600 and sealed on the outside of the sealing cap assembly 200. The labyrinth sealing ring 320 is fixedly fitted onto the drive shaft 600 on the side of the end cap body 310 away from the sealing cap assembly 200. A second labyrinth sealing structure 321 is formed between the labyrinth sealing ring 320 and the end cap body 310. The end cap body 310 is provided with a grease filling hole 312 that communicates with the second labyrinth sealing structure 321. The sealing end cap assembly 300 also includes a non-contact sealing structure, such as a second labyrinth sealing structure 321. The second labyrinth sealing structure 321 forms a tortuous sealing path, and grease is added into the second labyrinth sealing structure 321 through the grease filling hole 312. This allows the labyrinth sealing ring 320 to rotate with the drive shaft 600 while effectively blocking external contaminants from entering through the second labyrinth sealing structure 321, and also creating a certain resistance to possible leakage of thin oil inside.

[0044] Specifically, the labyrinth sealing ring 320 is fixedly connected to the drive shaft 600 by the fifth fastener 322, and a fourth sealing ring 323 is provided between the labyrinth sealing ring 320 and the drive shaft 600. The fifth fastener 322 includes, but is not limited to, a screw, and the fourth sealing ring 323 includes, but is not limited to, a rubber sealing ring.

[0045] In one embodiment of the present invention, the second labyrinth seal structure 321 extends radially along the drive shaft 600. Specifically, the second labyrinth seal structure 321 forms a radially distributed tortuous sealing channel by providing radially alternating protrusions and grooves on the side of the labyrinth seal ring 320 opposite to the end cap body 310. This structure effectively extends the path for external contaminants to enter and the path for internal thin oil leakage while occupying less space axially, further improving the sealing performance of the sealing end cap assembly 300.

[0046] In one embodiment of the present invention, the sealing end cap assembly 300 further includes an oil-absorbing sealing ring 340 press-fitted onto the end cap body 310. The oil-absorbing sealing ring 340 seals the outer end of the second labyrinth sealing structure 321 to prevent grease from overflowing from the outer end of the second labyrinth sealing structure 321. Simultaneously, it has oil-absorbing properties, capable of absorbing trace amounts of thin oil that may penetrate to this location, further enhancing the sealing effect. The oil-absorbing sealing ring 340 can be made of a material with good oil absorption and elasticity, such as a felt sealing ring or an oil-absorbing rubber sealing ring. Specifically, the sealing end cap assembly 300 further includes a pressure plate 350, which presses the oil-absorbing sealing ring 340 onto the end cap body 310 and seals the outer end of the second labyrinth sealing structure 321, forming an auxiliary sealing barrier.

[0047] In one embodiment of the present invention, the end cap body 310 is provided with a first stop boss portion 313, which extends into the sealing cap assembly 200 and the drive shaft 600 and presses against the contact seal 230 to ensure the positional stability of the contact seal 230 and enhance the reliability of the contact seal.

[0048] In one embodiment of the present invention, both the first pressure cap 210 and the second pressure cap 220 are provided with a stop fit structure between themselves and the bearing seat 500. The stop fit structure enables rapid positioning and installation of the first pressure cap 210 and the second pressure cap 220 on the bearing seat 500, ensuring coaxiality and tight connection between them and the bearing seat 500.

[0049] Furthermore, the present invention also provides a mill, wherein the mill includes a bearing housing sealing device according to the above-described embodiments. Since the mill adopts all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here.

[0050] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A bearing housing sealing device, characterized in that, include: A sealing cover module (100) is fitted onto the drive shaft (600) and seals the inner cavity of the bearing housing (500) at the sealing end of the bearing housing (500). The sealing cover module (100) has an oil return hole (221) on the lower side of the drive shaft (600) that communicates with the inner cavity of the bearing housing (500). An oil collection assembly (400) is located in the inner cavity of the bearing housing (500) and includes an oil slinger ring (410) and an oil baffle (420). The oil slinger ring (410) is fixedly fitted onto the drive shaft (600) near the gap between the sealing cover module (100) and the drive shaft (600). The oil baffle (420) extends around the oil slinger ring (410) on the upper side of the drive shaft (600). The upper end of the oil baffle (420) is connected to the sealing cover module (100), and the lower end forms a first oil collection groove (424) on the side facing the sealing cover module (100). The first oil collection groove (424) forms a first oil outlet (4241) on the outer side of the oil slinger ring (410).

2. The bearing housing sealing device according to claim 1, characterized in that, The oil slinger ring (410) includes a sealing section (411) and an oil slinger section (412) arranged sequentially along the axial direction of the drive shaft (600). The sealing section (411) is placed between the drive shaft (600) and the sealing cover module (100) and forms a non-contact sealing structure with the sealing cover module (100). The oil slinger section (412) extends into the inner cavity of the bearing seat (500), and the outer peripheral side of the oil slinger section (412) is opposite to and spaced apart from the oil baffle (420).

3. The bearing housing sealing device according to claim 2, characterized in that, The non-contact sealing structure is configured as a first labyrinth sealing structure (4111), and the first labyrinth sealing structure (4111) is configured to extend axially along the drive shaft (600); and / or, the outer peripheral side of the oil-slinging section (412) is provided with a pointed head (4121).

4. The bearing housing sealing device according to claim 2, characterized in that, The sealing cover module (100) includes a sealing cover assembly (200) and a sealing end cover assembly (300). The sealing cover assembly (200) is placed at the sealing end of the bearing housing (500) and includes a first cover (210), a second cover (220), and a contact seal (230). The first cover (210) and the second cover (220) are respectively disposed on the upper and lower sides of the drive shaft (600) and are both connected to the bearing housing (500). The contact seal (230) and the sealing section (411) are sequentially disposed between the sealing cover assembly (200) and the drive shaft (600) along the axial direction of the drive shaft (600). The second cover (220) is provided with the oil return hole (221). The sealing end cover assembly (300) is fitted onto the drive shaft (600) and the sealing cover is disposed on the outside of the sealing cover assembly (200).

5. The bearing housing sealing device according to claim 4, characterized in that, The second pressure cap (220) is also provided with a first oil return channel (222) with both ends open. The upper end of the first oil return channel (222) is connected to the end of the non-contact sealing structure near the contact seal (230), and the lower end is connected to the inner cavity of the bearing seat (500).

6. The bearing housing sealing device according to claim 5, characterized in that, The second pressure cap (220) is also provided with a second oil return channel (223) with both ends open. The upper end of the second oil return channel (223) is guided to the side of the contact seal (230) away from the oil slinger ring (410), and the lower end is connected to the inner cavity of the bearing seat (500). The lower end of the first oil return channel (222) is guided to the second oil return channel (223) so as to be connected to the inner cavity of the bearing seat (500) through the second oil return channel (223).

7. The bearing housing sealing device according to claim 6, characterized in that, The second oil return channel (223) is inclined downward along the direction of the sealing end cap assembly (300) toward the second pressure cap (220), and the lower end of the second oil return channel (223) penetrates the side of the second pressure cap (220) toward the inner cavity of the bearing seat (500) to form a third oil outlet (2231). The first oil return channel (222) is vertically arranged above the second oil return channel (223) and its lower end is connected to the second oil return channel (223).

8. The bearing housing sealing device according to claim 6, characterized in that, The upper end of the second oil return channel (223) passes through the mating surface of the second pressure cap (220) and the sealing end cap assembly (300); the sealing end cap assembly (300) is provided with a third oil return channel (311) on the lower side of the drive shaft (600), the upper end of the third oil return channel (311) is connected to the gap between the sealing end cap assembly (300) and the drive shaft (600), and the lower end is connected to the upper end of the second oil return channel (223).

9. The bearing housing sealing device according to any one of claims 1 to 8, characterized in that, The oil baffle (420) includes a connecting plate (421), an oil baffle (422), and a first groove plate (423). The connecting plate (421) is attached to the sealing cover module (100). The oil baffle (422) is inclined from the connecting plate (421) away from the sealing cover module (100) in a downward direction. The first groove plate (423) is located on the side of the oil baffle (422) facing the sealing cover module (100). The lower end of the first groove plate (423) is connected to the lower end of the oil baffle (422), and the upper end of the first groove plate (423) is spaced apart from the oil baffle (422) so that a first oil collection groove (424) with the first oil outlet (4241) at both ends is formed between the first groove plate (423) and the oil baffle (422).

10. The bearing housing sealing device according to claim 9, characterized in that, The oil baffle (420) further includes a second groove plate (425), which is located on the side of the oil baffle (422) away from the sealing cover module (100). The lower end of the second groove plate (425) is connected to the lower end of the oil baffle (422), and the upper end of the second groove plate (425) is spaced apart from the oil baffle (422) so that a second oil collection groove (426) with a second oil outlet (4261) at both ends is formed between the second groove plate (425) and the oil baffle (422).

11. The bearing housing sealing device according to claim 4, characterized in that, The sealing end cap assembly (300) includes an end cap body (310) and a labyrinth sealing ring (320). The end cap body (310) is fitted onto the drive shaft (600) and sealed to the outside of the sealing cap assembly (200). The labyrinth sealing ring (320) is fixedly fitted onto the drive shaft (600) on the side of the end cap body (310) away from the sealing cap assembly (200). A second labyrinth sealing structure (321) is formed between the labyrinth sealing ring (320) and the end cap body (310). The end cap body (310) is provided with a grease filling hole (312) communicating with the second labyrinth sealing structure (321).

12. The bearing housing sealing device according to claim 11, characterized in that, The second labyrinth sealing structure (321) is provided to extend radially along the drive shaft (600); And / or, the sealing end cap assembly (300) further includes an oil-absorbing sealing ring (340) press-fitted onto the end cap body (310), the oil-absorbing sealing ring (340) sealing the outer end of the second labyrinth sealing structure (321), and the oil-absorbing sealing ring (340) being a felt sealing ring. And / or, the end cap body (310) has a first stop boss (313) protruding out, the first stop boss (313) extending between the sealing cap assembly (200) and the drive shaft (600) and pressing the contact seal (230).

13. The bearing housing sealing device according to claim 4, characterized in that, The contact seal (230) is configured as a skeleton oil seal; and / or, the first gland (210) and the second gland (220) are both provided with a stop fit structure between them and the bearing seat (500).

14. A mill, characterized in that, The mill includes a bearing housing sealing device according to any one of claims 1 to 13.

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