A hydraulic gyratory crusher friction disc anti-wear protection device

Abstract

The present invention relates to the field of hydraulic gyratory crushers, and in particular to an anti-wear protection device for a friction disc of a hydraulic gyratory crusher. The device comprises a mounting seat; the mounting seat is arranged on the inner wall of a mounting sleeve and is located above a plunger, and a mounting frame is arranged on the mounting seat; an anti-wear component is arranged on the side of the mounting frame facing the friction disc. The present invention is provided with an anti-wear component, and the extrusion piece is randomly touched by the movement of the friction disc. The nozzle sprays oil toward the friction disc in small amounts, multiple times, and dispersedly. The lubricating oil covers the working surface of the friction disc, effectively reducing wear, playing a role in protecting the friction disc, and reducing maintenance costs. By alternately discharging and inletting oil, the oil output is small and the energy consumption is low. The device is simple to install and operate, has strong firmness, and is convenient for subsequent disassembly and maintenance. It can be adapted to hydraulic gyratory crushers of different brands.

Description

Technical Field

[0001] The invention relates to the field of hydraulic gyratory crushers, in particular to an anti-wear protection device for a friction disc of a hydraulic gyratory crusher. Background Art

[0002] The crushing cone of the hydraulic gyratory crusher is supported by the bottom hydraulic cylinder, and the upper part is inserted into the conical bushing in the center hole of the crossbeam. The lower part of the crushing cone is tightly connected with the upper friction disc. The cylinder is installed at the lower part of the machine base, which supports the crushing cone and bears the axial force when the crusher is working. There are three friction discs on the upper part of the cylinder. The upper friction disc has a flat surface on the top, which is connected to the lower end of the main shaft of the moving cone through a pressure ring, and a spherical surface on the bottom. The middle friction disc has a spherical surface on the top, and the radius of the spherical surface is the same as that of the lower spherical surface of the upper friction disc, and the bottom is a flat surface. The lower friction disc is fixed on the plunger, and the upper plane contacts the lower plane of the middle friction disc to participate in sliding friction. When the crusher is working, the upper friction disc, the middle friction disc and the lower friction disc in the cylinder form a set of sliding friction lubrication device.

[0003] A Chinese patent document with the authorization announcement number CN 106513098 B discloses a middle friction disc limiting device for a single-cylinder hydraulic cone crusher, which includes an upper friction disc fixedly mounted on the lower part of a moving cone, a middle friction disc and a lower friction disc arranged in sequence at the lower part of the upper friction disc, the lower part of the middle friction disc is inserted into an inner hole with a step in the lower friction disc, and then the middle friction disc and the lower friction disc are connected together with a nut; the lower friction disc is located on the piston and positioned by the inner concave in the middle of the piston; when the moving cone performs a rotary pendulum motion, the middle friction disc performs a small range of swing.

[0004] The prior art achieves the purpose of protecting the friction disc by improving the structure of the friction disc itself. In the actual working process, the weight and impact vibration of the moving cone are transmitted to the oil cylinder through the friction disc, so the friction disc is subjected to great force and wear during friction operation, and there is no further anti-wear protection device. Summary of the invention

[0005] In view of the problems existing in the background technology, a hydraulic gyratory crusher friction disc anti-wear protection device is proposed. The present invention is provided with an anti-wear component, which randomly touches the extrusion part through the movement of the friction disc. The nozzle sprays oil towards the friction disc in small amounts, multiple times, and dispersedly. The lubricating oil covers the working surface of the friction disc, which effectively reduces wear, plays an effect of protecting the friction disc, and reduces maintenance costs. By alternating oil discharge and oil intake, the oil output is small and the energy consumption is low. The device is simple to install and operate, has strong firmness, and is convenient for subsequent disassembly and maintenance. It can be adapted to hydraulic gyratory crushers of different brands.

[0006] The present invention proposes an anti-wear protection device for the friction disc of a hydraulic gyratory crusher, comprising a mounting seat; the mounting seat is arranged on the inner wall of the mounting sleeve and is located above the plunger, and a mounting frame is arranged on the mounting seat; an anti-wear component is arranged on the side of the mounting frame facing the friction disc. The anti-wear component comprises an oil storage tank; an isolation frame is arranged inside the oil storage tank, and is divided into an oil outlet chamber and an oil storage chamber by the isolation frame; an extrusion bag with rebound performance and an extrusion member matched with the extrusion bag are arranged in the oil outlet chamber; a nozzle is arranged at the upper end of the extrusion bag, and an oil inlet pipe is arranged at the lower end; the nozzle extends out of the oil storage tank, and the oil spraying direction is toward the friction disc, and a one-way valve 1 that can only discharge oil is arranged on the nozzle; the lower end of the oil inlet pipe extends into the oil storage chamber, and a one-way valve 2 that can only take in oil is arranged; a lubricating oil inlet pipe is also arranged in the oil storage chamber.

[0007] Preferably, multiple groups of oil outlet chambers are provided; and the extrusion capsules are arranged one-to-one in each group of oil outlet chambers.

[0008] Preferably, multiple groups of nozzles are provided corresponding to each group of extrusion capsules, and the spraying directions are staggered.

[0009] Preferably, the extrusion member includes an extrusion rod; the extrusion rod is slidably arranged on the oil storage tank, one end of the extrusion rod extends into the oil storage chamber and is connected to the extrusion plate, and the other end is connected to the extrusion frame.

[0010] Preferably, the extrusion plate is slidably disposed in the oil storage chamber and is always located at one side of the extrusion bag.

[0011] Preferably, the extrusion frame is an arc-shaped structure, with its concave surface facing the friction disk and provided with balls.

[0012] Preferably, the mounting frame is a horizontal U-shaped structure, the vertical section is slidably connected to the side wall of the mounting seat, and the horizontal section is provided with an oil storage tank.

[0013] Preferably, the mounting seat is welded to the mounting sleeve, and the mounting seat is provided with mounting hole one and mounting hole two; the mounting frame is slidably arranged on the mounting seat, and a rotatable adjusting bolt is arranged on the horizontal section of the mounting frame; the adjusting bolt is respectively threadedly connected with the corresponding mounting hole one, and the end portion extends out of the mounting sleeve and the connecting nut; the lubricating oil inlet pipe passes through mounting hole two and the mounting frame, extends out of the mounting sleeve and is connected to the external oil supply equipment.

[0014] Preferably, a sealing plate is provided between the mounting seat and the mounting frame; a fixing nail 1 and a fixing nail 2 are provided on the sealing plate; the fixing nail 1 connects the sealing plate and the mounting frame; and the fixing nail 2 connects the sealing plate and the mounting seat.

[0015] Preferably, the above-mentioned hydraulic gyratory crusher friction disc anti-wear protection device works as follows:

[0016] S1. When the moving cone performs a pendulum motion, the middle friction disc performs a small range of swing;

[0017] S2. When the middle friction disc swings toward the oil storage tank, the ball contacts the middle friction disc and is squeezed by force; the squeezing frame, squeezing rod and squeezing plate move synchronously, and one side of the squeezing bag is squeezed, so that the lubricating oil inside is squeezed out and sprayed toward the friction disc through the nozzle;

[0018] S3, when the middle friction disc is moving away from the oil storage tank, the negative pressure in the extrusion bag causes the lubricating oil in the oil storage chamber to be sucked into the extrusion bag through the oil inlet pipe;

[0019] S4, the lubricating oil is sprayed out in small amounts, multiple times and dispersedly, acting on the friction disc;

[0020] S5. When the oil level in the oil storage chamber is insufficient, oil is added through the lubricating oil inlet pipe.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects:

[0022] 1. The present invention is provided with an anti-wear component, which randomly touches the extrusion part through the movement of the friction disk. The extrusion frame, the extrusion rod and the extrusion plate move synchronously, and one side of the extrusion bag is extruded. The nozzle sprays oil toward the friction disk in small amounts, multiple times and dispersedly. The lubricating oil covers the working surface between the upper friction disk and the middle friction disk, and between the middle friction disk and the lower friction disk, effectively reducing wear and playing the role of protecting the friction disk, preventing the friction disk from being frequently replaced due to wear, and achieving the purpose of reducing maintenance costs.

[0023] Second, the present invention utilizes the extrusion bag with rebound performance to alternately discharge and inlet oil, with a small amount of oil discharge and low energy consumption.

[0024] 3. The present invention adjusts the distance between the anti-wear component and the friction disc by rotating the adjusting bolt. Tighten the nut to fix the mounting frame. Finally, use the fixing nail 1 and the fixing nail 2 to install the sealing plate between the mounting seat and the mounting frame. The entire installation operation is simple, strong and convenient for subsequent disassembly and maintenance. It can be adapted to different brands of hydraulic gyratory crushers. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of an installation state of an embodiment of the present invention;

[0026] Figure 2 A rear view of an embodiment of the present invention;

[0027] Figure 3 A front view of an embodiment of the present invention;

[0028] Figure 4 This is a disassembly diagram of an embodiment of the present invention;

[0029] Figure 5 It is a schematic diagram of disassembly of an anti-wear component in an embodiment of the present invention.

[0030] Figure numerals: 1. upper friction disc; 2. middle friction disc; 3. lower friction disc; 4. mounting sleeve; 5. plunger; 6. mounting seat; 7. mounting frame; 8. anti-wear component; 9. oil storage tank; 10. isolation frame; 11. oil storage chamber; 12. oil outlet chamber; 13. extrusion bag; 14. oil inlet pipe; 15. nozzle; 16. extrusion plate; 17. extrusion rod; 18. extrusion frame; 19. ball; 20. adjusting bolt; 21. nut; 22. sealing plate; 23. fixing nail one; 24. fixing nail two; 25. extrusion piece; 26. mounting hole two; 27. lubricating oil inlet pipe; 28. mounting hole one. DETAILED DESCRIPTION

[0031] Embodiment 1

[0032] like Figure 1-5 As shown, a wear protection device for the friction disc of a hydraulic gyratory crusher proposed by the present invention comprises a mounting seat 6; the mounting seat 6 is arranged on the inner wall of the mounting sleeve 4 and is located above the plunger 5, and a mounting frame 7 is arranged on the mounting seat 6; an anti-wear component 8 is arranged on the side of the mounting frame 7 facing the friction disc. The anti-wear component 8 comprises an oil storage tank 9; an isolation frame 10 is arranged inside the oil storage tank 9, and is divided into an oil outlet chamber 12 and an oil storage chamber 11 by the isolation frame 10; an extrusion bag 13 with rebound performance and an extrusion member 25 matched with the extrusion bag 13 are arranged in the oil outlet chamber 12; a nozzle 15 is arranged at the upper end of the extrusion bag 13, and an oil inlet pipe 14 is arranged at the lower end; the nozzle 15 extends out of the oil storage tank 9, and the oil spraying direction faces the friction disc, and a one-way valve 1 that can only discharge oil is arranged on the nozzle 15; the lower end of the oil inlet pipe 14 extends into the oil storage chamber 11, and is provided with a one-way valve 2 that can only inlet oil; and a lubricating oil inlet pipe 27 is also arranged in the oil storage chamber 11.

[0033] In this embodiment, an anti-wear component 8 is provided, and the friction disc performs a swinging motion to trigger the extrusion piece 25. The extrusion piece 25 presses one side of the extrusion bag 13, so that the lubricating oil inside is squeezed out and sprayed toward the friction disc through the nozzle 15. As the middle friction disc 2 swings, the lubricating oil covers between the upper friction disc 1 and the middle friction disc 2, and between the middle friction disc 2 and the lower friction disc 3, thereby preventing the working surface from being worn.

[0034] Embodiment 2

[0035] like Figure 1-5As shown, a wear protection device for the friction disc of a hydraulic gyratory crusher proposed by the present invention comprises a mounting seat 6; the mounting seat 6 is arranged on the inner wall of the mounting sleeve 4 and is located above the plunger 5, and a mounting frame 7 is arranged on the mounting seat 6; an anti-wear component 8 is arranged on the side of the mounting frame 7 facing the friction disc. The anti-wear component 8 comprises an oil storage tank 9; an isolation frame 10 is arranged inside the oil storage tank 9, and is divided into an oil outlet chamber 12 and an oil storage chamber 11 by the isolation frame 10; an extrusion bag 13 with rebound performance and an extrusion member 25 matched with the extrusion bag 13 are arranged in the oil outlet chamber 12; a nozzle 15 is arranged at the upper end of the extrusion bag 13, and an oil inlet pipe 14 is arranged at the lower end; the nozzle 15 extends out of the oil storage tank 9, and the oil spraying direction faces the friction disc, and a one-way valve 1 that can only discharge oil is arranged on the nozzle 15; the lower end of the oil inlet pipe 14 extends into the oil storage chamber 11, and is provided with a one-way valve 2 that can only inlet oil; and a lubricating oil inlet pipe 27 is also arranged in the oil storage chamber 11.

[0036] Furthermore, multiple groups of oil outlet chambers 12 are provided, and the extrusion capsules 13 are provided one by one in each group of oil outlet chambers 12. Multiple groups of nozzles 15 are provided corresponding to each group of extrusion capsules 13, and the oil injection directions are staggered. The oil injection directions are dispersed, and the single oil injection amount is small.

[0037] Furthermore, the extrusion member 25 includes an extrusion rod 17; the extrusion rod 17 is slidably arranged on the oil storage tank 9, one end of which extends into the oil storage chamber 11 and is connected to the extrusion plate 16, and the other end is connected to the extrusion frame 18. The extrusion plate 16 is slidably arranged in the oil storage chamber 11 and is always located on one side of the extrusion bag 13. The extrusion frame 18 is an arc-shaped structure, with its concave surface facing the friction disk, and is provided with a ball 19. When the middle friction disk 2 swings toward the oil storage tank 9, the ball 19 contacts the middle friction disk 2 and is squeezed by force; the extrusion frame 18, the extrusion rod 17 and the extrusion plate 16 move synchronously, and one side of the extrusion bag 13 is squeezed.

[0038] Furthermore, a water level sensor is provided in the oil storage chamber 11 to monitor the remaining amount of lubricating oil to avoid the situation where there is no oil available. An electric control valve is provided on the lubricating oil inlet pipe 27. When the amount of lubricating oil is lower than the set value, the electric control valve opens and oil is supplied through the external oil supply device, which is automatic and intelligent.

[0039] Embodiment 3

[0040] like Figure 1-5As shown, a wear protection device for the friction disc of a hydraulic gyratory crusher proposed by the present invention comprises a mounting seat 6; the mounting seat 6 is arranged on the inner wall of the mounting sleeve 4 and is located above the plunger 5, and a mounting frame 7 is arranged on the mounting seat 6; an anti-wear component 8 is arranged on the side of the mounting frame 7 facing the friction disc. The anti-wear component 8 comprises an oil storage tank 9; an isolation frame 10 is arranged inside the oil storage tank 9, and is divided into an oil outlet chamber 12 and an oil storage chamber 11 by the isolation frame 10; an extrusion bag 13 with rebound performance and an extrusion member 25 matched with the extrusion bag 13 are arranged in the oil outlet chamber 12; a nozzle 15 is arranged at the upper end of the extrusion bag 13, and an oil inlet pipe 14 is arranged at the lower end; the nozzle 15 extends out of the oil storage tank 9, and the oil spraying direction faces the friction disc, and a one-way valve 1 that can only discharge oil is arranged on the nozzle 15; the lower end of the oil inlet pipe 14 extends into the oil storage chamber 11, and is provided with a one-way valve 2 that can only inlet oil; and a lubricating oil inlet pipe 27 is also arranged in the oil storage chamber 11.

[0041] Furthermore, multiple groups of oil outlet chambers 12 are provided, and the extrusion capsules 13 are provided one by one in each group of oil outlet chambers 12. Multiple groups of nozzles 15 are provided corresponding to each group of extrusion capsules 13, and the oil injection directions are staggered. The oil injection directions are dispersed, and the single oil injection amount is small.

[0042] Furthermore, the extrusion member 25 includes an extrusion rod 17; the extrusion rod 17 is slidably arranged on the oil storage tank 9, one end of which extends into the oil storage chamber 11 and is connected to the extrusion plate 16, and the other end is connected to the extrusion frame 18. The extrusion plate 16 is slidably arranged in the oil storage chamber 11 and is always located on one side of the extrusion bag 13. The extrusion frame 18 is an arc-shaped structure, with its concave surface facing the friction disk, and is provided with a ball 19. When the middle friction disk 2 swings toward the oil storage tank 9, the ball 19 contacts the middle friction disk 2 and is squeezed by force; the extrusion frame 18, the extrusion rod 17 and the extrusion plate 16 move synchronously, and one side of the extrusion bag 13 is squeezed.

[0043] Furthermore, a water level sensor is provided in the oil storage chamber 11 to monitor the remaining amount of lubricating oil to avoid the situation where there is no oil available. An electric control valve is provided on the lubricating oil inlet pipe 27. When the amount of lubricating oil is lower than the set value, the electric control valve opens and oil is supplied through the external oil supply device, which is automatic and intelligent.

[0044] Furthermore, the mounting frame 7 is a horizontal U-shaped structure, the vertical section is slidably connected to the side wall of the mounting seat 6, and the horizontal section is provided with an oil storage tank 9.

[0045] Furthermore, the mounting seat 6 is welded to the mounting sleeve 4, and the mounting seat 6 is provided with a mounting hole 1 28 and a mounting hole 26; the mounting frame 7 is slidably arranged on the mounting seat 6, and a rotatable adjusting bolt 20 is arranged on the horizontal section of the mounting frame 7; the adjusting bolt 20 is threadedly connected with the corresponding mounting hole 1 28, and the end portion extends out of the mounting sleeve 4 and connects with the nut 21; the lubricating oil inlet pipe 27 passes through the mounting hole 26 and the mounting frame 7, extends out of the mounting sleeve 4 and is connected with the external oil supply equipment.

[0046] Furthermore, a sealing plate 22 is provided between the mounting seat 6 and the mounting frame 7; a fixing nail 1 23 and a fixing nail 24 are provided on the sealing plate 22; the fixing nail 1 23 connects the sealing plate 22 and the mounting frame 7; and the fixing nail 24 connects the sealing plate 22 and the mounting seat 6.

[0047] When installing the device, firstly, adjust the adjusting bolt 20 relative to the mounting hole 1 28, rotate and install, adjust the distance between the anti-wear component 8 and the friction plate to a suitable value, tighten the nut 21, and fix the mounting frame 7. At the same time, pass the lubricating oil inlet pipe 27 through the mounting hole 2 26 to connect the oil storage chamber 11 and the external oil supply device. Use the fixing nail 1 23 and the fixing nail 24 to install the sealing plate 22 between the mounting seat 6 and the mounting frame 7.

[0048] Embodiment 4

[0049] The anti-wear protection device for the friction disc of a hydraulic gyratory crusher described in Examples 1-3 works as follows:

[0050] S1, when the moving cone performs a pendulum motion, the middle friction disc 2 performs a small range of swing;

[0051] S2, during the swinging process of the middle friction disc 2 toward the oil storage tank 9, the ball 19 contacts the middle friction disc 2 and is squeezed by force; the squeezing frame 18, the squeezing rod 17 and the squeezing plate 16 move synchronously, and one side of the squeezing bag 13 is squeezed, so that the lubricating oil inside is squeezed out and sprayed toward the friction disc through the nozzle 15;

[0052] S3, when the middle friction disc 2 is moving away from the oil storage tank 9, the negative pressure in the squeezing bag 13 causes the lubricating oil in the oil storage chamber 11 to be sucked into the squeezing bag 13 through the oil inlet pipe 14;

[0053] S4, the lubricating oil is sprayed out in small amounts, multiple times and dispersedly, acting on the friction disc;

[0054] S5. When the oil level in the oil storage chamber 11 is insufficient, oil is introduced through the lubricating oil inlet pipe 27.

[0055] The device in this embodiment drives the extrusion member 25 to work through the movement of the friction disc, triggers the oil injection and oil feeding actions, realizes small, multiple, and dispersed oil injection, acts on the working surface between the upper friction disc 1 and the middle friction disc 2, and between the middle friction disc 2 and the lower friction disc 3, effectively reduces wear, plays an effect of protecting the friction disc, prevents the friction disc from being frequently replaced due to wear, and achieves the purpose of reducing maintenance costs. The working method is simple, the energy consumption is low, and the oil requirement is small.

[0056] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A hydraulic gyratory crusher friction disc anti-wear protection device, characterized in that: The mounting seat (6) is provided on the inner wall of the mounting sleeve (4) and is located above the plunger (5); a mounting frame (7) is provided on the mounting seat (6); an anti-wear component (8) is provided on the side of the mounting frame (7) facing the friction disc; The anti-wear component (8) comprises an oil storage tank (9); an isolation frame (10) is arranged inside the oil storage tank (9) and is divided into an oil outlet chamber (12) and an oil storage chamber (11); an extrusion bag (13) with rebound performance and an extrusion member (25) matched with the extrusion bag (13) are arranged in the oil outlet chamber (12); a nozzle (15) is arranged at the upper end of the extrusion bag (13), and an oil inlet pipe (14) is arranged at the lower end; the nozzle (15) extends out of the oil storage tank (9), and the oil spraying direction is toward the friction disk, and a one-way valve (1) that can only discharge oil is arranged on the nozzle (15); the lower end of the oil inlet pipe (14) extends into the oil storage chamber (11) and is provided with a one-way valve (2) that can only inlet oil; and a lubricating oil inlet pipe (27) is also arranged in the oil storage chamber (11); A plurality of groups of oil outlet chambers (12) are provided; and the extrusion capsules (13) are provided in each group of oil outlet chambers (12) in a one-to-one correspondence; Multiple groups of spray heads (15) are provided corresponding to each group of extrusion capsules (13), and the spraying directions are staggered; The extrusion member (25) comprises an extrusion rod (17); the extrusion rod (17) is slidably arranged on the oil storage tank (9), one end of which extends into the oil storage chamber (11) and is connected to the extrusion plate (16), and the other end of which is connected to the extrusion frame (18); The extrusion frame (18) is an arc-shaped structure, the concave surface of which faces the friction disc, and is provided with a ball (19).

2. A hydraulic gyratory crusher friction disc anti-wear protection device according to claim 1, characterized in that: The squeezing plate (16) is slidably arranged in the oil storage chamber (11) and is always located on one side of the squeezing bag (13).

3. A hydraulic gyratory crusher friction disc anti-wear protection device according to claim 1, characterized in that: The mounting frame (7) is in a transverse U-shaped structure, the vertical section is slidably connected to the side wall of the mounting seat (6), and the horizontal section is provided with an oil storage tank (9).

4. A hydraulic gyratory crusher friction disc anti-wear protection device according to claim 3, characterized in that: The mounting seat (6) is welded to the mounting sleeve (4), and the mounting seat (6) is provided with a first mounting hole (28) and a second mounting hole (26); the mounting frame (7) is slidably arranged on the mounting seat (6), and a rotatable adjusting bolt (20) is arranged on the horizontal section of the mounting frame (7); the adjusting bolt (20) is threadedly connected to the corresponding first mounting hole (28), and the end of the adjusting bolt extends out of the mounting sleeve (4) and is connected to the nut (21); the lubricating oil inlet pipe (27) passes through the second mounting hole (26) and the mounting frame (7), extends out of the mounting sleeve (4), and is connected to an external oil supply device.

5. A hydraulic gyratory crusher friction disc anti-wear protection device according to claim 4, characterized in that: A sealing plate (22) is arranged between the mounting seat (6) and the mounting frame (7); a fixing nail (23) and a fixing nail (24) are arranged on the sealing plate (22); the fixing nail (23) connects the sealing plate (22) and the mounting frame (7); and the fixing nail (24) connects the sealing plate (22) and the mounting seat (6).

6. A hydraulic gyratory crusher friction disc anti-wear protection device according to any one of claims 1 to 5, characterized in that: The working method is as follows: S1, when the moving cone performs a rotary pendulum motion, the middle friction disc (2) performs a small range of swing; S2, during the swinging of the middle friction disc (2) toward the oil storage tank (9), the ball (19) contacts the middle friction disc (2) and is squeezed by force; the squeezing frame (18), the squeezing rod (17) and the squeezing plate (16) move synchronously, and one side of the squeezing bag (13) is squeezed, so that the lubricating oil inside is squeezed out and sprayed toward the friction disc through the nozzle (15); S3, when the middle friction disc (2) moves away from the oil storage tank (9), the negative pressure in the extrusion bag (13) causes the lubricating oil in the oil storage chamber (11) to be sucked into the extrusion bag (13) through the oil inlet pipe (14); S4, the lubricating oil is sprayed out in small amounts, multiple times and dispersedly, acting on the friction disc; S5. When the oil level in the oil storage chamber (11) is insufficient, oil is introduced through the lubricating oil inlet pipe (27).

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