Pendulum mill thin oil lubrication grinding roller with oil stain separation function

Abstract

The invention belongs to the technical field of pendulum mill grinding rollers, and particularly relates to a pendulum mill thin oil lubrication grinding roller with an oil stain separation function. A pendulum mill thin oil lubrication grinding roller with an oil stain separation function comprises a grinding roller shaft, a grinding roller frame, a sealing cylinder, a rotating cylinder, a grinding roller core, a grinding roller and a bearing, a lower cover is fixedly sealed at an opening in the lower end of the grinding roller core, and a dirt containing disc abutting against the upper end of the lower cover is embedded in the grinding roller core; a dirt containing cavity is defined by the dirt containing disc and the lower cover, and a lubricating cavity is defined by the inner wall of the grinding roller core, the dirt containing disc and the grinding roller shaft; a sediment hole communicated with the lubricating cavity and the pollutant containing cavity is formed in the upper end of the pollutant containing disc, and lubricating oil and impurities can enter the pollutant containing cavity from the lubricating cavity through the sediment hole. High-reliability sealing of the inner cavity of the grinding roller core can be achieved, oil dirt separation of the inner cavity of the grinding roller core can be achieved, and lubricating oil can be replaced conveniently.

Description

Technical Field

[0001] This invention belongs to the technical field of pendulum mill rollers, and particularly relates to a pendulum mill thin oil lubrication roller with oil-stain separation function. Background Technology

[0002] Oil-lubricated grinding rollers have been successfully applied in pendulum mills due to their long oil replenishment cycle and low maintenance costs. During operation, the grinding rollers of a pendulum mill both revolve around the grinding roller axis and rotate on their own axis, while also oscillating along the crossbeam axis. Because of these unique operating conditions, pendulum mills use oil-lubricated grinding rollers, and the bearing lubrication method typically employs a closed-cavity oil bath lubrication. Since the lubricating oil cannot be circulated and filtered, regular oil replacement is necessary to ensure the healthy operation of the grinding rollers.

[0003] Existing oil-lubricated grinding rollers include Chinese utility model patents such as CY2387968 (Grinding Roller Assembly for Suspended Roller Grinding Mill) and CN102728437B (Self-Lubricating Grinding Roller). In particular, Chinese utility model patent CN217464014U (Lubricated Grinding Roller Assembly) discloses a lubricated grinding roller assembly where the grinding roller drives the grinding roller sleeve and bearing to rotate, while the grinding roller shaft remains stationary. High-temperature resistant machine oil can be injected into the grinding roller sleeve and bearing sleeve, immersing the bearing in the oil. The machine oil lubricates the bearing and dissipates heat, thereby improving the fluidity and lubricity of the lubricating medium, enhancing the high-temperature resistance of the equipment, and reducing internal wear of the grinding roller assembly. A pressure cap with a sealing element is also provided at the end of the grinding roller shaft, further reducing internal wear, preventing oil leakage, and minimizing dust entry into the assembly cavity, thus increasing the service life of the grinding roller assembly and reducing costs.

[0004] The existing traditional pendulum mill with thin oil lubrication has the following shortcomings: 1. During operation, the iron filings, sludge, and other impurities generated inside the grinding roller core increase in oil concentration over time, severely affecting the service life of the bearings inside the grinding roller core and easily leading to bearing wear; 2. The existing seals between the inner cavity of the grinding roller core and the inner cavity of the mill main unit mostly use oil seals, which have limited sealing effect. Dust generated inside the mill main unit can easily enter the inner cavity of the grinding roller core through the worn parts of the oil seal, leading to bearing wear; in addition, the oil seals on the grinding roller assembly are not lubricated and are easily damaged; 3. The grinding chamber of the pendulum mill is small, and when changing the lubricating oil, it is necessary to remove the grinding roller chamber, which is time-consuming and laborious; 4. The lubricating oil level inside the grinding roller core cannot be measured. Too much oil can easily leak, while insufficient oil can lead to inadequate lubrication and easy bearing damage. Summary of the Invention

[0005] To address at least one technical problem in the prior art, this application provides a pendulum mill thin oil lubricated mill roller with oil-stain separation function, which can achieve high-reliability sealing of the inner cavity of the mill roller core, achieve oil-stain separation of the inner cavity of the mill roller core, and facilitate the replacement of lubricating oil.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A pendulum mill with oil-sludge separation function and thin oil lubrication roller includes a roller shaft, a roller frame, a sealing cylinder fixedly connected to the lower part of the roller frame, a rotating cylinder rotatably inserted into the sealing cylinder, a roller core fixedly connected to the lower part of the rotating cylinder, a roller mounted on the roller core, a bearing sleeved on the roller shaft inside the inner cavity of the roller core, a lower cover fixedly sealed at the lower opening of the roller core, and a dirt-collecting disc embedded in the roller core that abuts against the upper end of the lower cover; the dirt-collecting disc and the lower cover enclose a dirt-collecting cavity, and the inner wall of the roller core, the dirt-collecting disc, and the roller shaft enclose a lubrication cavity; a sedimentation hole is opened at the upper end of the dirt-collecting disc to connect the lubrication cavity and the dirt-collecting cavity, and lubricating oil and impurities can enter the dirt-collecting cavity from the lubrication cavity through the sedimentation hole.

[0007] Preferably, a sludge-collecting trough for accommodating impurities is provided in the sludge-collecting cavity. The sludge-collecting trough is formed on the inner wall of the sludge-collecting tray, or on the inner wall of the lower cover, or on both the inner wall of the sludge-collecting tray and the inner wall of the lower cover.

[0008] Preferably, multiple sludge-collecting troughs are provided along the axial direction of the sludge-collecting tray, and each sludge-collecting trough is opened along the axial direction of the sludge-collecting tray.

[0009] Preferably, the sedimentation hole is located in the middle of the sludge receiving plate, and a main shaft lower nut is fixedly connected to the grinding roller shaft below the bearing. The lower part of the grinding roller shaft and the main shaft lower nut are rotatably inserted into the sedimentation hole. A separation gap is provided between the main shaft lower nut and the inner wall of the sedimentation hole, and lubricating oil and impurities can enter the sludge receiving chamber from the lubrication chamber through the separation gap.

[0010] Preferably, the sedimentation hole is located in the middle of the sludge receiving plate, the lower end of the grinding roller shaft is located above the sedimentation hole, and a separation gap two is provided between the lower end of the grinding roller shaft and the sedimentation hole. Lubricating oil and impurities can enter the sludge receiving chamber from the lubrication chamber through the separation gap two and the sedimentation hole in sequence.

[0011] Preferably, an upper cylinder is coaxially arranged on the lower end face of the sludge receiving plate at the sludge hole, and a lower cylinder is arranged on the upper end face of the lower cover. The upper cylinder is inserted into the lower cylinder, and a cylinder through groove is formed on the circumference of the lower cylinder to connect the inner cavity of the lower cylinder and the sludge receiving cavity.

[0012] Preferably, rectangular threaded grooves are formed along the axial direction on both the inner and outer circumferences of the rotating cylinder, a bushing is fixedly sleeved on the grinding roller shaft inside the rotating cylinder, an annular fixing groove is formed on the upper end face of the rotating cylinder, and an oil seal is embedded in the fixing groove, the oil seal abutting against the outer circumference of the bushing.

[0013] Preferably, a threaded hole is provided at the lower part of the grinding roller frame, and a smooth hole is provided at the lower end face of the grinding roller frame. The threaded hole is connected to the smooth hole, and the sealing bolt is threaded into the threaded hole. Lubricating grease can be added to the oil seal through the threaded hole and the smooth hole.

[0014] Preferably, the rotating cylinder is fixedly connected to the grinding roller core via a connecting flange, and an oblique hole communicating with the inner cavity of the grinding roller core is obliquely opened on the connecting flange. A detection plug with an oil dipstick is detachably installed in the oblique hole.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The beneficial effects of this invention patent are that it has oil-stain separation function, is easy to maintain, and is reliable in operation, which are specifically reflected in the following aspects: 1. Impurities such as iron filings and sludge in the lubricating oil can be separated and collected, ensuring the cleanliness of the lubricating oil inside the grinding roller core and extending the service life of the lubricating oil and bearings.

[0016] 2. When changing the lubricating oil, the grinding roller does not need to be removed from the main unit of the grinding mill. The oil is changed conveniently and efficiently through the oil filling port (i.e., oil filling hole) and the venting port (i.e., inclined hole).

[0017] 3. Equipped with an oil dipstick, the oil level in the lubrication chamber inside the grinding roller core can be measured, ensuring accurate oil replenishment and avoiding both insufficient and excessive oil.

[0018] 4. By setting sealing bolts, threaded holes, and smooth holes, channels for adding grease are opened. By injecting grease into the oil seal, the oil seal can be lubricated and its service life can be extended.

[0019] 5. By using two sets of mechanical seals formed between the sealing cylinder and the rotating cylinder, and between the rotating cylinder and the bushing, as well as two sets of oil seals embedded at the upper end of the rotating cylinder, a reliable seal is achieved between the inner cavity of the grinding roller core and the inside of the grinding mill main unit. This prevents dust inside the grinding mill main unit from contaminating the lubricating oil and effectively prevents lubricating oil leakage from the inner cavity of the grinding roller core. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of Embodiments 1 and 2 of the present invention.

[0021] Figure 2 This is a schematic diagram of the connection structure between the rotating cylinder and the connecting flange in an embodiment of the present invention.

[0022] Figure 3 for Figure 1 A magnified structural diagram at point A.

[0023] Figure 4 for Figure 1 A magnified structural diagram at point B.

[0024] Figure 5 for Figure 1 A magnified structural diagram at point C.

[0025] Figure 6 This is a half-section structural diagram and a bottom view structural diagram of Embodiment 2 of the present invention.

[0026] Figure 7 This is a schematic diagram of the overall structure of Embodiment 3 of the present invention.

[0027] Figure 8 for Figure 7 Enlarged structural diagram at point D (second type of sludge tray and lower cover structure).

[0028] Figure 9 This is a half-sectional schematic diagram and a top view of the sludge tray and lower cover of Embodiment 3 of the present invention (first type of sludge tray and lower cover structure).

[0029] Figure 10 This is a schematic diagram of the lower cover of Embodiment 3 of the present invention.

[0030] Figure 11 This is a half-sectional view of the sludge tray and lower cover of Embodiment 3 of the present invention (the third type of sludge tray and lower cover structure).

[0031] Figure 12 This is a half-section and bottom view schematic diagram of the sludge receiving tray of Embodiment 3 of the present invention.

[0032] Figure 13 This is a half-sectional view of the sludge tray and lower cover of Embodiment 3 of the present invention (the fourth type of sludge tray and lower cover structure).

[0033] Figure 14 This is a half-section and top view structural diagram of the lower cover of Embodiment 3 of the present invention.

[0034] In the diagram: 1. Grinding roller shaft; 11. Sealing plug; 12. Shaft sleeve; 13. Oil filling hole. 2. Grinding roller frame; 21. Sealing cylinder; 22. Threaded hole; 23. Smooth hole; 24. Sealing bolt. 3. Rotating cylinder; 31. Connecting flange; 311. Upper O-ring; 312. Angled hole; 32. Grinding roller core; 33. Threaded groove; 34. Fixing groove; 35. Oil seal; 36. Oil dipstick; 37. Inspection plug. 4. Grinding roller; 41. Roller core lower nut; 5. Bearing; 51. Upper bearing; 52. Lower bearing; 53. Spacer; 54. Lower spindle nut. 6. Lower cover; 61. Lower plate; 62. Support protrusion; 621. Stain collection groove; 63. Lower O-ring; 64. Lower cylinder; 65. Cylinder through groove. 7. Sludge receiving tray; 71. Sludge hole; 72. Separation tank; 73. Guide channel; 74. Sludge receiving tank; 75. Guide channel hole; 76. Upper cylinder. 81. Dirt receiving chamber; 82. Lubrication chamber; 83. Separation gap one; 84. Separation gap two. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Example 1

[0037] See Figure 1 As shown, a pendulum mill thin oil lubricating roller with oil-stain separation function includes a roller shaft 1 with a stepped shaft structure, a roller frame 2 fixedly sleeved on the upper part of the roller shaft 1, a sealing cylinder 21 fixedly connected to the lower part of the roller frame 2 by welding and coaxially arranged with the roller shaft 1, a rotating cylinder 3 rotatably inserted into the sealing cylinder 21 and rotatably sleeved on the roller shaft 1, a connecting flange 31 fixedly connected to the lower part of the rotating cylinder 3 by welding, a hollow roller core 32 fixedly connected to the lower end of the connecting flange 31 by bolts, a roller 4 fixed to the outer circumference of the roller core 32 by a roller core lower nut 41, and a bearing 5 sleeved on the roller shaft 1 in the inner cavity of the roller core 32.

[0038] Specifically, the grinding roller core 32 has an inverted truncated cone structure, the grinding roller 4 is sleeved on the grinding roller core 32, and the lower nut 41 of the grinding roller core is threadedly connected to the grinding roller core 32 below the grinding roller 4. By tightening the lower nut 41 of the grinding roller core, the lower nut 41 of the grinding roller core abuts against the grinding roller 4, thereby fixing the grinding roller 4 on the grinding roller core 32.

[0039] An upper bearing 51 and a lower bearing 52 are respectively fitted along the upper and lower edges of the grinding roller shaft 1 inside the grinding roller core 32, and are separated by a spacer 53. A lower spindle nut 54 is threaded onto the grinding roller shaft 1 below the lower bearing 52, and the lower bearing 52 is axially limited by the lower spindle nut 54. The above structure can be used for existing pendulum grinding rollers with thin oil lubrication. With the above structure, the grinding roller 4, grinding roller core 32, connecting flange 31, and rotating cylinder 3 can rotate relative to the grinding roller shaft 1 under the action of the bearing 5. It should be noted that the installation method of the bearing 5 on the grinding roller shaft 1 and grinding roller core 32 is existing technology and will not be described in detail here.

[0040] In this embodiment, the lower end of the grinding roller core 32 has an open structure. Therefore, a lower cover 6 is fixedly sealed at the lower opening of the grinding roller core 32, and the lower cover 6 is fixedly installed on the lower end face of the grinding roller core 32 by bolts. An oiling through hole 13 is provided along the axial direction of the grinding roller shaft 1, and a sealing plug 11 is detachably installed on the upper end of the grinding roller shaft 1 via a thread. The oiling through hole 13 on the grinding roller shaft 1 forms an oiling and oil extraction channel. When it is necessary to add or extract oil from the inner cavity of the grinding roller core 32, the sealing plug 11 can be removed. The lubricating oil immerses the upper bearing 51 and the lower bearing 52 in gear oil, ensuring reliable lubrication of the bearings 5.

[0041] See Figure 5 As shown, to improve the sealing effect of the lower cover 6 on the inner cavity of the grinding roller core 32, the lower cover 6 includes a lower plate 61 and a cylindrical support protrusion 62 coaxially fixedly connected to the lower plate 61. A lower O-ring 63 is embedded in the outer circumference of the support protrusion 62. The lower plate 61 is fixedly installed on the lower end face of the grinding roller core 32 by bolts. The contact surface between the lower O-ring 63 and the grinding roller core 32 is coated with sealant.

[0042] In addition, an upper O-ring 311 is embedded in the outer circumference of the portion of the connecting flange 31 that extends into the grinding roller core 32, and sealant is applied to the contact surface between the upper O-ring 311 and the grinding roller core 32. Thus, by setting the lower O-ring 63 and the upper O-ring 311, a sealed cavity can be formed inside the grinding roller core 32 to accommodate lubricating oil.

[0043] See Figure 2 As shown, rectangular threaded grooves 33 are formed along the axial direction on both the inner and outer circumferences of the rotating cylinder 3. A bushing 12 is fixedly sleeved on the grinding roller shaft 1 inside the rotating cylinder 3. In this embodiment, a shoulder can be provided on the grinding roller shaft 1 at the corresponding position of the bushing 12 to limit the bushing 12 in the axial direction. An annular fixing groove 34 is formed on the upper end face of the rotating cylinder 3, and an oil seal 35 is embedded in the fixing groove 34. The inner side of the oil seal 35 abuts against the outer circumference of the bushing 12.

[0044] The oil seal 35 installed at the upper end of the rotating cylinder 3 serves to isolate oil and prevent dust, thus preventing particles in the main body of the swing mill from entering the inner cavity of the grinding roller core 32 through the gap between the inner wall of the rotating cylinder 3 and the outer circumference of the bushing 12, thereby causing corrosion and wear to the bearing 5.

[0045] The outer circumference of the rotating cylinder 3 is provided with a threaded groove 33, which forms a spiral seal with the inner wall of the sealing cylinder 21. This prevents particles in the swing mill main unit from entering the oil seal 35 through the gap between the inner wall of the sealing cylinder 21 and the outer circumference of the rotating cylinder 3, thereby further preventing corrosion and wear on the bearing 5.

[0046] The inner wall of the rotating cylinder 3 is provided with a threaded groove 33, which forms a spiral seal with the bushing 12 on the grinding roller shaft 1. This allows the lubricating oil that has been thrown to the upper part of the rotating cylinder by the grinding roller shaft 1 to be discharged downwards, thus preventing oil leakage.

[0047] See Figure 4 As shown, a threaded hole 22 is horizontally provided at the lower part of the grinding roller frame 2, and a smooth hole 23 is vertically provided on the lower end face of the grinding roller frame 2 that extends into the sealing cylinder 21. The threaded hole 22 is connected to the smooth hole 23. The sealing bolt 24 is detachably threaded into the threaded hole 22. When it is necessary to add grease to the oil seal 35 for lubrication, the grease can be added to the oil seal 35 through the threaded hole 22 and the smooth hole 23.

[0048] See Figure 3 As shown, the rotating cylinder 3 is fixedly connected to the grinding roller core 32 via the connecting flange 31. An oblique hole 312 is provided on the connecting flange 31, which is inclined toward the inner cavity of the grinding roller core 32 and communicates with the inner cavity of the grinding roller core 32. A detection plug 37 with an oil dipstick 36 is detachably threaded into the oblique hole 312.

[0049] When lubricating oil needs to be added to or removed from the inner cavity of the grinding roller core 32, the sealing plug 11 and the detection plug 37 can be removed to vent the oil through the inclined hole 312. By installing an oil dipstick 36 on the detection plug 6, when lubricating oil is added to the inner cavity of the grinding roller core 32 through the oil filling hole 13 of the grinding roller shaft 1, the detection bolt 6 can be inserted into the inclined hole 312 along with the oil dipstick 36, allowing for measurement of the oil level in the inner cavity of the grinding roller core 32 during oil filling. It should be noted that the inclined hole 312 is located above the upper bearing 51.

[0050] See Figure 1 As shown, a dirt-collecting tray 7 is embedded in the grinding roller core 32, which abuts against the upper end of the support protrusion 62 of the lower cover 6; the dirt-collecting tray 7 and the opposite lower cover 6 enclose a dirt-collecting cavity 81, and the inner wall of the grinding roller core 32, the dirt-collecting tray 7 and the grinding roller shaft 1 enclose a lubrication cavity 82; lubricating oil is added to the lubrication cavity 82, and the upper bearing 51 and the lower bearing 52 are both immersed in the lubricating oil for lubrication.

[0051] A sedimentation hole 71 is provided at the upper end of the sludge receiving plate 7, which connects the lubrication chamber 82 and the sludge receiving chamber 81. Lubricating oil and impurities can enter the sludge receiving chamber 81 from the lubrication chamber 82 through the sedimentation hole 71.

[0052] See Figure 5 As shown, specifically, the sludge receiving disc 7 has a disc-shaped structure. A separation groove 72 is formed below the sediment hole 71 on the sludge receiving disc 7, penetrating the disc 7. The separation groove 72 connects to the sediment hole 71, and its inner diameter is larger than that of the sediment hole 71. A conical guide groove 73 is formed on the upper end face of the sludge receiving disc 7 at the sediment hole 71 to facilitate the rapid entry of lubricating oil and impurities into the separation groove 72. The inner cavity of the separation groove 72 is the sludge receiving cavity 81. A stepped structure is provided on the inner wall of the grinding roller core 32 at the upper end face of the sludge receiving disc 7. The upper end face of the sludge receiving disc 7 abuts against the lower end face of this step, and the lower end face of the sludge receiving disc 7 abuts against the upper end face of the supporting protrusion 62, thereby fixing the sludge receiving disc 7 inside the grinding roller core 32.

[0053] In this embodiment, the sedimentation hole 71 is opened in the middle of the sludge receiving plate 7. A main shaft lower nut 54 is fixedly connected to the grinding roller shaft 1 below the lower bearing 52. The lower part of the grinding roller shaft 1 and the main shaft lower nut 54 are rotatably inserted into the sedimentation hole 71. A separation gap 83 is provided between the main shaft lower nut 54 and the inner wall of the sedimentation hole 71. Lubricating oil and impurities can enter the sludge receiving chamber 81 from the lubrication chamber 82 through the separation gap 83.

[0054] The oil separation function of this invention is achieved as follows: After the grinding mill stops, under the action of gravity, impurities such as iron filings and sludge in the grinding roller core 32 pass through the separation gap 83 on the sludge collection plate 7 from the lubrication chamber 82 into the sludge collection chamber 81, completing the separation of iron filings, sludge, and other impurities from the lubrication chamber 82. When the grinding mill is running, the grinding roller core 32 rotates at high speed along the grinding roller shaft 1. Under the action of centrifugal force, impurities such as iron filings and sludge are thrown to the edge of the sludge collection chamber 81, completing the collection of iron filings, sludge, and other impurities. Since the grinding roller shaft 1 is inserted into the sludge hole 71, it is difficult for the iron filings, sludge, and other impurities thrown to the edge of the sludge collection chamber 81 to re-enter the lubrication chamber 82 through the separation gap 83, thereby avoiding the wear of the bearing 5 in the lubrication chamber 82 and realizing the separation of oil and sludge.

[0055] In addition, when the lubricating oil needs to be changed, the lubricating oil can be added and sucked in through the oil filling hole 13 via the pipeline. At this time, the lubricating oil in the sludge chamber 81 can also be replaced. When it is necessary to remove impurities such as iron filings and sludge, the sludge tray 7 can be removed by simply stopping the machine and removing the lower cover 6 to remove the impurities in the sludge tray 7. Example 2

[0056] This embodiment is a further improvement on embodiment 1. Compared with embodiment 1, this embodiment can further collect impurities such as iron filings and sludge to further prevent impurities from flowing back into the lubrication cavity 82.

[0057] See Figure 6 As shown, a dirt-collecting trough 74 for collecting impurities is provided in the dirt-collecting cavity 81, and the dirt-collecting trough 74 is formed on the inner wall of the dirt-collecting plate 7.

[0058] Specifically, the sludge receiving groove 74 is formed along the axial direction of the sludge receiving disc 7 on the inner wall of the separation groove 72, and multiple sludge receiving grooves 74 are evenly distributed around the circumference of the separation groove 72. The cross-section of the sludge receiving groove 74 can have various shapes, such as rectangular, arc-shaped, or dovetail-shaped. In addition, threaded sludge receiving grooves 74 can also be formed on the inner wall of the separation groove 72.

[0059] The oil separation function of this invention is achieved as follows: After the grinding mill stops, under the action of gravity, impurities such as iron filings and sludge in the grinding roller core 32 pass through the separation gap 83 on the sludge collection plate 7 from the lubrication chamber 82 into the sludge collection chamber 81, completing the separation of impurities such as iron filings and sludge from the lubrication chamber 82. When the grinding mill is running, the grinding roller core 32 rotates at high speed along the grinding roller shaft 1. Under the action of centrifugal force, impurities such as iron filings and sludge are thrown to the edge of the sludge collection chamber 81 and enter the sludge collection trough 74, completing the collection of impurities such as iron filings and sludge.

[0060] Of course, in other embodiments, the sludge tank 74 may not be provided. Instead, a filter element structure may be embedded in the separation tank 72. Impurities such as sponges, iron filings, and sludge are thrown into the filter element structure under centrifugal force to complete the collection of impurities. Example 3

[0061] See Figure 7 , 8 As shown, this embodiment is a modification of embodiment 1. The difference between this embodiment and embodiment 1 is that the structure of the sludge tray 7 and the lower cover 6, as well as the positional relationship between the grinding roller shaft 1 and the sludge tray 7 are different. Other structures remain unchanged.

[0062] In this embodiment, the lower end of the grinding roller shaft 1 and the main shaft lower nut 54 mounted thereon are located above the sedimentation hole 71. The sedimentation hole 71 is opened in the middle of the sludge receiving plate 7. A separation gap 2 84 is provided between the lower end of the grinding roller shaft 1 and the sedimentation hole 71, and between the outer side of the main shaft lower nut 54 and the inner wall of the grinding roller core 32. Lubricating oil and impurities can enter the sludge receiving chamber 81 from the lubrication chamber 82 through the separation gap 2 84 and the sedimentation hole 71 in sequence. The support protrusion 62 is a cylindrical hollow structure with an opening at its upper end.

[0063] Specifically, the structure of the sludge tray 7 and the corresponding lower cover 6 can be at least as follows: 1. The first type of sludge tray and lower cover structure is as follows: See Figure 9As shown, specifically, the sludge receiving disc 7 has a disc-shaped structure, with a sedimentation hole 71 located in the middle of the disc and penetrating through it. The separation groove 72 described in embodiments 1 and 2 is not provided on the lower end face of the disc 7. The lower end face of the disc 7 rests on the upper end face of the supporting protrusion 62, and the lower end face of the disc 7 and the inner cavity of the supporting protrusion 62 enclose a sludge receiving cavity 81. In this embodiment, to prevent impurities from flowing back into the lubrication cavity 82 through the sedimentation hole 71, the inner diameter of the sedimentation hole 71 is smaller than the outer diameter of the grinding roller shaft 1. Its specific size can accommodate the outer diameter of the oil pipe extending into the sedimentation hole 71 through the oil filling through-hole 13.

[0064] An inverted frustum-shaped guide groove 73 is provided on the upper end face of the sludge receiving plate 7 at the sedimentation hole 71 so that impurities can quickly enter the sludge receiving chamber 81.

[0065] Furthermore, in order to accelerate the flow of impurities into the dirt-collecting cavity 81, multiple guide holes 75 are provided at the bottom of the guide channel 73. The shape of the guide holes 75 can be in various forms, such as round hole, arc, or strip.

[0066] See Figure 10 As shown, a dirt-holding groove 621 for accommodating impurities is provided on the inner wall of the support protrusion 62. The dirt-holding groove 621 is opened along the axial direction of the support protrusion 62, and multiple grooves can be evenly distributed around the circumference of the support protrusion 62. Similar to the dirt-holding groove 74 in Embodiment 2, the cross-section of the dirt-holding groove 621 can have various shapes, such as rectangular, arc-shaped, or dovetail-shaped. In addition, a threaded dirt-holding groove 621 can also be opened along the axial direction on the inner wall of the support protrusion 62.

[0067] The oil separation function of this invention is achieved as follows: After the grinding mill stops, under the action of gravity, impurities such as iron filings and sludge in the grinding roller core 32 pass through the separation gap 84, the guide hole 75, and the sludge hole 71 from the lubrication chamber 82 into the dirt-collecting chamber 81, completing the separation of impurities such as iron filings and sludge from the lubrication chamber 82. When the grinding mill is running, the grinding roller core 32 rotates at high speed along the grinding roller shaft 1. Under the action of centrifugal force, impurities such as iron filings and sludge are thrown to the edge of the dirt-collecting chamber 81 and enter the dirt-collecting tank 621, completing the collection of impurities such as iron filings and sludge.

[0068] Of course, in other embodiments, the dirt-holding tank 621 may not be provided. Instead, a filter element structure, such as a sponge, iron filings, sludge, and other impurities, may be embedded in the inner cavity of the supporting protrusion 62 to complete the collection of impurities.

[0069] 2. The second type of sludge tray and lower cover structure is as follows: See Figure 8As shown, this structure is an improvement on the first type of sludge-collecting tray and lower cover structure described above. Specifically, the sludge-collecting tray 7 is a disc-shaped structure, with a sediment hole 71 located in the middle of the tray 7 and penetrating through it. A separation groove 72, as described in embodiments 1 and 2, is formed on the lower end face of the tray 7. The separation groove 72 and the inner cavity of the supporting protrusion 62 enclose each other to form a sludge-collecting cavity 81. The lower end face of the tray 7 rests on the upper end face of the supporting protrusion 62, and the lower end face of the tray 7 and the inner cavity of the supporting protrusion 62 enclose each other to form the sludge-collecting cavity 81. An inverted frustum-shaped guide groove 73 is formed on the upper end face of the tray 7 at the sediment hole 71. Multiple guide holes 75 are formed at the bottom of the guide groove 73. The shape of the guide holes 75 can be various, such as circular, arc-shaped, or elongated.

[0070] A dirt-holding groove 621 for holding impurities is provided on the inner wall of the support protrusion 62. Multiple dirt-holding grooves 74 are opened on the inner wall of the separation groove 72 along the axial direction of the dirt-holding plate 7. The cross-section of the dirt-holding groove 74 can have various shapes, such as rectangular, arc or dovetail.

[0071] Furthermore, an upper cylinder 76 is coaxially and fixedly connected to the lower end face of the sludge receiving plate 7 at the sludge hole 71, and the upper cylinder 76 can extend into the inner cavity of the support protrusion 62.

[0072] The oil separation function of this invention is achieved as follows: After the grinding mill stops, under the action of gravity, impurities such as iron filings and sludge in the grinding roller core 32 pass through the separation gap 84, the guide hole 75, the sludge hole 71, and the upper cylinder 76 from the lubrication chamber 82 into the dirt-collecting chamber 81, completing the separation of impurities such as iron filings and sludge from the lubrication chamber 82. When the grinding mill is running, the grinding roller core 32 rotates at high speed along the grinding roller shaft 1. Under the action of centrifugal force, impurities such as iron filings and sludge are thrown to the edge of the dirt-collecting chamber 81 and enter the dirt-collecting tank 621 and the dirt-collecting tank 74, completing the collection of impurities such as iron filings and sludge.

[0073] 3. The third type of sludge tray and lower cover structure is as follows: See Figure 11 , 12As shown, this structure is an improvement on the second type of sludge tray and lower cover structure described above. Compared to the second type of sludge tray and lower cover structure, the structure of the lower cover 7 is the same in this structure, while the structure of the sludge tray 7 is different in that: the bottom of the inverted frustum-shaped guide groove 73 at the upper end of the sludge tray 7 extends along its taper to the upper end of the sediment hole 71, so that impurities such as iron filings and sludge can quickly enter the sediment hole 71; in addition, the guide groove 73 is not opened on the guide groove 73, thereby further preventing impurities entering the sludge chamber 81 from flowing back into the lubrication chamber 82 through the guide groove 73. An upper cylinder 76 is coaxially and fixedly connected to the lower end face of the sludge tray 7 at the sediment hole 71, and the upper cylinder 76 extends into the inner cavity of the support protrusion 62. The gap t between the lower end face of the upper cylinder 76 and the bottom of the inner cavity of the support protrusion 62 is 3-5mm.

[0074] In addition, a dirt-holding groove 621 for holding impurities is provided on the inner wall of the support protrusion 62, and multiple dirt-holding grooves 74 are opened on the inner wall of the separation groove 72 along the axial direction of the dirt-holding plate 7. The cross-section of the dirt-holding groove 74 can have various shapes, such as rectangular, arc or dovetail.

[0075] The oil separation function of this invention is achieved as follows: After the grinding mill stops, under the action of gravity, impurities such as iron filings and sludge in the grinding roller core 32 pass through the separation gap 84, the sludge hole 71, and the upper cylinder 76 from the lubrication chamber 82 into the dirt-collecting chamber 81, completing the separation of impurities such as iron filings and sludge from the lubrication chamber 82. When the grinding mill is running, the grinding roller core 32 rotates at high speed along the grinding roller shaft 1. Under the action of centrifugal force, impurities such as iron filings and sludge are thrown to the edge of the dirt-collecting chamber 81 and enter the dirt-collecting tank 621 and the dirt-collecting tank 74, completing the collection of impurities such as iron filings and sludge.

[0076] Of course, in this sludge tray and lower cover structure, the sludge tank 621 and sludge tank 74 may not be provided. Instead, a filter element structure is embedded in the sludge chamber 81. Impurities such as sponge, iron filings, and sludge are thrown into the filter element structure under the action of centrifugal force to complete the collection of impurities.

[0077] 4. The fourth type of sludge tray and lower cover structure is as follows: See Figure 13 , 14As shown, this structure is an improvement on the third type of sludge tray and lower cover structure described above. The difference lies in the following: a lower cylinder 64 is fixedly connected to the bottom of the inner cavity of the supporting protrusion 62 of the lower cover 6. An upper cylinder 76 is inserted into the lower cylinder 64. The gap between the outer circumference of the upper cylinder 76 and the inner wall of the lower cylinder 64 is 1-3 mm. The distance between the lower end face of the upper cylinder 76 and the upper end face of the lower cylinder 64 can be 3-5 mm. A cylinder through groove 65 is formed on the circumference of the lower cylinder 64, connecting the inner cavity of the lower cylinder 64 and the sludge-collecting cavity 81. Multiple cylinder through grooves 65 are evenly distributed along the circumference of the lower cylinder 64.

[0078] The oil separation function of this invention is achieved as follows: After the grinding mill stops, under the action of gravity, impurities such as iron filings and sludge in the grinding roller core 32 pass through the separation gap 84, the sludge hole 71, and the upper cylinder 76 from the lubrication chamber 82 into the lower cylinder 64, completing the separation of iron filings, sludge, and other impurities from the lubrication chamber 82. When the grinding mill is running, the grinding roller core 32 rotates at high speed along the grinding roller shaft 1. Under the action of centrifugal force, impurities such as iron filings and sludge in the lower cylinder 64 are thrown out through the cylinder through groove 65 to the edge of the dirt collection chamber 81, and enter the dirt collection tank 621 and dirt collection tank 74, completing the collection of iron filings, sludge, and other impurities. Because of the centrifugal force and the small size of the cylinder through groove 65, it is possible to prevent iron filings and other impurities from returning to the lubrication chamber 82.

[0079] When the lubricating oil in the lubrication chamber 82 needs to be replaced, remove the sealing plug 11 and the detection plug 37, and insert the oil suction pipe into the dirt receiving chamber 81 through the oil filling hole 13 and the sediment hole 71 to extract the lubricating oil from the lubrication chamber 82 and the dirt receiving chamber 81. Then, inject lubricating oil into the dirt receiving chamber 81 and the lubrication chamber 82 through the oil filling hole 13 until the upper bearing 51 is submerged. During this process, the dipstick 36 can be inserted into the inner cavity of the grinding roller core 32 to check the level of lubricating oil in the lubrication chamber 82 to determine whether the lubricating oil has been filled to the required level. After filling is completed, install the sealing plug 11 and the detection plug 37.

[0080] When it is necessary to remove impurities from the dirt collection trough 74 of the dirt collection tray 7 and the dirt holding trough 621 of the lower cover 6, remove the lower cover 6 from the grinding roller core 32 and take out the dirt collection tray 7, and then remove the impurities from both of them.

[0081] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pendulum mill thin oil lubricating roller with oil-sludge separation function, comprising a roller shaft, a roller frame, a sealing cylinder fixedly connected to the lower part of the roller frame, a rotating cylinder rotatably inserted into the sealing cylinder, a roller core fixedly connected to the lower part of the rotating cylinder, a roller disposed on the roller core, and a bearing sleeved on the roller shaft within the inner cavity of the roller core, characterized in that: A lower cover is fixedly sealed at the lower end opening of the grinding roller core, and a dirt-collecting disc is embedded in the grinding roller core, abutting against the upper end of the lower cover; the dirt-collecting disc and the lower cover enclose a dirt-collecting cavity, and the inner wall of the grinding roller core, the dirt-collecting disc and the grinding roller shaft enclose a lubrication cavity; a sedimentation hole is opened at the upper end of the dirt-collecting disc, connecting the lubrication cavity and the dirt-collecting cavity, and lubricating oil and impurities can enter the dirt-collecting cavity from the lubrication cavity through the sedimentation hole.

2. The pendulum mill thin oil lubricating roller with oil-stain separation function according to claim 1, characterized in that: A sludge-collecting trough for accommodating impurities is provided inside the sludge-collecting cavity. The sludge-collecting trough is located on the inner wall of the sludge-collecting tray, or on the inner wall of the lower cover, or on both the inner wall of the sludge-collecting tray and the inner wall of the lower cover.

3. The pendulum mill thin oil lubricating roller with oil-stain separation function according to claim 2, characterized in that: Multiple sludge-collecting troughs are provided along the axial direction of the sludge-collecting disc, and each sludge-collecting trough is opened along the axial direction of the sludge-collecting disc.

4. The pendulum mill thin oil lubricating roller with oil-stain separation function according to claim 1, characterized in that: The sedimentation hole is located in the middle of the sludge receiving plate. A main shaft lower nut is fixedly connected to the grinding roller shaft below the bearing. The lower part of the grinding roller shaft and the main shaft lower nut are rotatably inserted into the sedimentation hole. A separation gap is provided between the main shaft lower nut and the inner wall of the sedimentation hole. Lubricating oil and impurities can enter the sludge receiving chamber from the lubrication chamber through the separation gap.

5. The pendulum mill thin oil lubricating roller with oil-stain separation function according to claim 1, characterized in that: The sedimentation hole is located in the middle of the sludge receiving plate. The lower end of the grinding roller shaft is located above the sedimentation hole. A separation gap two is provided between the lower end of the grinding roller shaft and the sedimentation hole. Lubricating oil and impurities can enter the sludge receiving chamber from the lubrication chamber through the separation gap two and the sedimentation hole in sequence.

6. The pendulum mill thin oil lubricating roller with oil-stain separation function according to claim 5, characterized in that: An upper cylinder is coaxially arranged on the lower end face of the sludge receiving plate at the sludge hole, and a lower cylinder is arranged on the upper end face of the lower cover. The upper cylinder is inserted into the lower cylinder, and a cylinder through groove is opened on the circumference of the lower cylinder to connect the inner cavity of the lower cylinder and the sludge receiving cavity.

7. The pendulum mill thin oil lubricating roller with oil-stain separation function according to claim 1, characterized in that: Rectangular threaded grooves are provided along the axial direction on both the inner and outer circumferences of the rotating cylinder. A bushing is fixedly sleeved on the grinding roller shaft inside the rotating cylinder. An annular fixing groove is provided on the upper end face of the rotating cylinder. An oil seal is embedded in the fixing groove, and the oil seal abuts against the outer circumference of the bushing.

8. The pendulum mill thin oil lubricating roller with oil-stain separation function according to claim 7, characterized in that: A threaded hole is provided at the lower part of the grinding roller frame, and a smooth hole is provided at the lower end face of the grinding roller frame. The threaded hole is connected to the smooth hole, and the sealing bolt is threaded into the threaded hole. Lubricating grease can be added to the oil seal through the threaded hole and the smooth hole.

9. The pendulum mill thin oil lubricating roller with oil-stain separation function according to claim 1, characterized in that: The rotating cylinder is fixedly connected to the grinding roller core via a connecting flange. An oblique hole communicating with the inner cavity of the grinding roller core is obliquely opened on the connecting flange. A detection plug with an oil dipstick is detachably installed in the oblique hole.

Images