Oil spraying device for bull gear of coal mill in power plant

Abstract

The invention relates to the technical field of gear oil injection, and provides a power plant coal mill bull gear oil spraying device which comprises an oil storage tank used for storing oil, one side of the oil storage tank is communicated with a pump body provided with two liquid outlets, the two liquid outlets of the pump body are communicated with a spraying assembly in a coal mill gearbox through oil injection pipes, and the spraying assembly is communicated with the oil storage tank. The spraying assembly is driven by an electric push rod to be stored, a cavity is formed in the other side of the oil storage tank, a motor is installed in the cavity, and two cooling pipes in the oil storage tank are located on the outer wall of the motor in a spiral mode so that energy transmission between the cooling pipes and the motor can be achieved. The phenomenon that the spray head is blocked due to exposure in air is avoided, the spraying efficiency of lubricating oil is ensured, meanwhile, the flowability and the lubricating performance of the lubricating oil are ensured through energy conversion, the lubricating effect is improved, gear abrasion is reduced, the service life of the gear is prolonged, and on the contrary, a certain cooling effect can be achieved on the motor.

Description

Technical Field

[0001] The invention relates to the technical field of gear oil spraying, in particular to a large gear oil spraying device for a coal mill in a power plant. Background Art

[0002] During the operation of the coal mill in a thermal power plant, it is necessary to spray oil mist on the large gear at regular intervals. The main function is to spray oil and lubricate the large and small gears of the coal mill to protect them. During the operation of the coal mill in a power plant, the lubrication of the large gear is very important.

[0003] After searching, for example, the large gear oil injection device of the power plant coal mill with announcement number CN115539614A includes a hydraulic oil injection mechanism for oil injection to the large gear, a PLC program controller for controlling the operation of the large gear oil injection, and a jog button installed on the local equipment. The PLC program controller can be detachably installed on the local equipment, the power input end and the jog button of the PLC program controller are electrically connected to the local equipment, the signal input end of the PLC program controller is electrically connected to the output end of the jog button, the signal output end of the PLC program controller is electrically connected to the hydraulic oil injection mechanism, and the PLC program controller is provided with an oil injection interval cycle timing module, an oil injection duration timing module, a local jog injection module and an automatic circulation injection module, which solves the problem that the local secondary table used in the traditional coal mill large gear oil injection controls the oil injection method, the secondary table has a high failure rate, and brings safety hazards to the operation of the coal mill equipment unit;

[0004] However, there are many problems with the traditional lubrication method of large gears in coal mills. Some lubrication devices have simple structures and can only achieve basic oil spray lubrication. They cannot accurately control the amount of lubricating oil, which easily leads to waste of lubricating oil or insufficient lubrication. Moreover, in high temperature environments, the performance of lubricating oil is easily affected. Traditional devices lack an effective oil temperature regulation mechanism, which may cause changes in lubricating oil viscosity, affect the lubrication effect, and accelerate gear wear and shorten the service life of gears. At the same time, the efficiency of recycling lubricating oil after spraying is low, and the excess lubricating oil on the gear surface cannot be recycled and reused in a timely and effective manner, which increases operating costs and may cause environmental pollution. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a large gear oil spraying device for a coal mill in a power plant, which solves the problems that the performance of the lubricating oil is easily affected, which accelerates gear wear and shortens the service life of the gears, and the excess lubricating oil on the gear surface cannot be recovered and reused in a timely and effective manner, which increases operating costs and may cause environmental pollution.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a large gear oil spraying device for a coal mill in a power plant, comprising an oil storage tank for storing oil, one side of the oil storage tank is connected to a pump body provided with two liquid outlets, the two liquid outlets of the pump body are connected to the spray assembly inside the coal mill gear box through an oil filling pipe, the spray assembly is stored by the drive of an electric push rod, the other side of the oil storage tank is provided with a cavity, and a motor is installed in the cavity, two cooling pipes inside the oil storage tank are spirally located on the outer wall of the motor to realize energy transfer with the motor, an adapter is installed on the side of the motor at the driving end, the outer wall of the transmission end of the adapter is connected to the chassis, a speed regulating conduction assembly is arranged inside the chassis to change the speed of the motor and transmit it to the oil suction assembly, the oil suction assembly is located inside the oil suction box, and the oil suction box is installed at the bottom of the coal mill gear box.

[0007] Preferably, couplings are fixedly connected to both sides of the coal mill gearbox, and the couplings gradually decrease in size from top to bottom, and the couplings in the middle and bottom are connected to the chassis through shafts.

[0008] Preferably, a base is fixedly connected to the bottom of the oil storage tank, a cover plate is connected to the oil filling port at the top of the oil storage tank via a torsion spring, and a sealing ring is fixedly connected to the bottom edge of the cover plate to seal the oil filling port.

[0009] Preferably, the oil storage tank is connected to the motor by using a mounting plate, wherein the mounting plate located on the outer wall of the motor is double-layered, and the inner layer is used to connect with the adapter, the bottom of the adapter is fixedly connected to a support seat, and the other side of the oil storage tank is fixedly connected to a shell for wrapping the outer wall of the motor.

[0010] Preferably, an opening is provided in the middle of one side of the coal mill gear box, and a box door is installed at the opening by bolts for observing the two gears inside the coal mill gear box. The diameter of the upper gear inside the coal mill gear box is larger than the diameter of the lower gear inside the coal mill gear box, and cooling fins are provided on both sides of the outer wall of the coal mill gear box.

[0011] Preferably, the spray assembly includes spray boxes located on both sides of the coal mill gear box, and the spray box is located between the two gears, the interior of the spray box is horizontally slidably connected to a slide seat, the top of the slide seat is connected to a spray head through a torsion spring, the spray head is connected to the oil filling pipe through a telescopic tube, the end of the slide seat is connected to the telescopic end of the electric push rod, and the electric push rod is located on both sides of the outer wall of the coal mill gear box.

[0012] Preferably, the oil suction assembly includes a turntable located inside the oil suction box for rotation, the outer wall of the turntable is provided with a corrugated oil absorption sponge, the oil absorption sponge is tightly attached to the gear on the lower side of the inner side of the coal mill gear box, and the turntable is connected to the coupling on the lower side of the outer wall of the coal mill gear box through a shaft so as to rotate under the guidance of the speed regulation transmission assembly.

[0013] Preferably, an oil collecting hopper is fixedly connected to the bottom of the oil suction box, and an oil outlet on one side of the oil collecting hopper is connected to the bottom of the oil storage tank through a recovery pipe to pump the oil into the interior of the oil storage tank. A filter is provided inside the oil collecting hopper to filter the oil.

[0014] Preferably, the speed regulation transmission component includes sprocket 2 and sprocket 1 which are located inside the chassis and rotate, the diameter of sprocket 2 is larger than the diameter of the lower sprocket 1, sprocket 2 and sprocket 1 are connected by a chain, sprocket 2 is connected to the coupling in the middle through an axis, and sprocket 1 is connected to the coupling at the bottom through an axis.

[0015] Preferably, the speed regulation transmission component also includes gear 2 and gear 1 which rotate inside the chassis, the diameter of gear 2 is larger than the diameter of gear 1 at the lower side, gear 2 and gear 1 are meshed with each other, gear 2 is connected to the coupling in the middle through a shaft, and gear 1 is connected to the coupling at the bottom through a shaft.

[0016] Working principle: First, inject lubricating oil into the oil storage tank. The lubricating oil enters through the oil filling port. The cover plate at the oil filling port is usually closed under the action of the torsion spring. The sealing ring at the bottom edge ensures the sealing of the oil filling port to prevent dust and other impurities from entering.

[0017] When it is necessary to spray lubricate the gears in the coal mill gearbox, start the pump body, which draws lubricating oil from the oil storage tank and transports the lubricating oil through its two outlets through the oil filling pipe to the nozzles on both sides of the coal mill gearbox. At the same time, start the electric push rod, and the telescopic end of the electric push rod drives the slide seat to slide out of the spray box. Under the action of the torsion spring, the nozzle on the top of the slide seat extends out of the spray box along the push of the slide seat (the nozzle pre-adjusts the extension length according to the gear position), and the nozzle sprays the lubricating oil evenly on the gears in the coal mill gearbox to lubricate and cool the gears. After the spraying is completed, the electric push rod moves in the opposite direction to pull the nozzle back into the spray box, returning to the initial storage state, and waiting for the next spraying.

[0018] In addition, when the motor of the power plant's coal mill is started, the heat generated is transferred to the lubricating oil in the oil storage tank through heat exchange with the spiral cooling tube. The lubricating oil absorbs the heat and has a certain cooling effect on the motor. At the same time, the temperature of the lubricating oil itself increases to avoid solidification.

[0019] The power of the motor is transmitted to sprocket two through the adapter. Since the diameter of sprocket two is larger than that of sprocket one, sprocket one will rotate at different speeds through the transmission of the chain. At this time, sprocket one drives the turntable to rotate, and the corrugated oil-absorbing sponge sleeved on its outer wall contacts the gear on the lower side of the coal mill gear box, and then absorbs and spreads it evenly. As the gear rotates, the oil-absorbing sponge absorbs excess lubricating oil on the gear (including the lubricating oil that flows down after spraying and is brought out during the operation of the gear).

[0020] The oil-absorbing sponge that has absorbed the lubricating oil drips into the oil collecting hopper under the contact and squeezing inside the oil suction box. After being filtered by the internal filter to remove impurities, it flows back to the bottom of the oil storage tank through the recovery pipe, realizing the recovery and reuse of the lubricating oil.

[0021] The present invention provides a large gear oil spraying device for a coal mill in a power plant, which has the following beneficial effects:

[0022] 1. The present invention uses an electric push rod to control the nozzle to be in a storage state when not in use, thereby avoiding clogging of the nozzle due to exposure to the air and ensuring the efficiency of lubricating oil spraying. In addition, the rotation speed difference is used to wipe the surface of the gear with an oil-absorbing sponge, efficiently absorbing excess lubricating oil on the gear, and achieving a smoothing effect when saturated. At the same time, the corrugated design increases the contact area with the gear and improves the oil absorption efficiency.

[0023] 2. The spiral cooling pipe in the oil storage tank of the present invention can utilize the heat generated by the operation of the motor to heat the lubricating oil. It can increase the oil temperature in a low temperature environment, ensure the fluidity and lubricating performance of the lubricating oil, and achieve effective regulation of the oil temperature, so that the lubricating oil is always in a suitable temperature range, thereby improving the lubrication effect, reducing gear wear, and extending the service life of the gear. Conversely, it can also play a certain cooling role on the motor.

[0024] 3. After the oil sprayed out through the nozzle of the present invention is filtered by the oil collecting hopper, the lubricating oil returns to the oil storage tank through the recovery pipe, thereby realizing the recovery and reuse of the lubricating oil, reducing the operating cost, reducing the waste of lubricating oil, and also being beneficial to environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A perspective view of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the coupling in the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the present invention when the door is open;

[0028] Figure 4 It is a schematic diagram of the states of the nozzle in use and when stored in the present invention;

[0029] Figure 5 It is a schematic diagram of the internal structure of the oil suction box in the present invention;

[0030] Figure 6 It is a schematic diagram of the connection structure of the motor in the present invention;

[0031] Figure 7 It is a structural schematic diagram of the oil storage tank in the present invention;

[0032] Figure 8 is a schematic diagram of a cooling tube in the present invention;

[0033] Fig. 9 It is a structural schematic diagram of the chassis in the present invention;

[0034] Fig.10 This is a schematic diagram of the internal structure of a chassis according to Embodiment 1 of the present invention;

[0035] Fig.11 This is a schematic diagram of the internal structure of the chassis of Example 2 of the present invention.

[0036] Among them, 1. Coal mill gearbox; 2. Electric push rod; 3. Chassis; 4. Recovery pipe; 5. Base; 6. Pump body; 7. Oil storage tank; 8. Cover plate; 9. Oil filling pipe; 10. Adapter; 11. Coupling; 12. Box door; 13. Oil collecting hopper; 14. Oil suction tank; 15. Spray box; 16. Slide seat; 17. Cooling pipe; 18. Nozzle; 19. Turntable; 20. Oil absorption sponge; 21. Motor; 22. Mounting plate; 23. Support seat; 24. Housing; 25. Sprocket one; 26. Sprocket two; 27. Chain; 28. Gear one; 29. ​​Gear two. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Embodiment 1:

[0039] As one aspect of the present invention, please refer to the attached Figure 1 , Attachment Figure 3 and attached Figure 8 The embodiment of the present invention provides a large gear oil spraying device for a coal mill in a power plant, comprising an oil storage tank 7 for storing oil, a base 5 being fixedly connected to the bottom of the oil storage tank 7, a cover plate 8 being connected to the oil filling port at the top of the oil storage tank 7 through a torsion spring, and a sealing ring being fixedly connected to the bottom edge of the cover plate 8 to seal the oil filling port and prevent dust and other impurities from entering, see the attached Figure 8 The two cooling pipes 17 inside the oil storage tank 7 are located on the outer wall of the motor 21 in a spiral manner. When the motor 21 of the coal mill of the power plant is started, the heat generated is transferred to the lubricating oil in the oil storage tank 7 through heat exchange with the spiral cooling pipe 17. The lubricating oil absorbs the heat and plays a certain cooling role on the motor 21. At the same time, the temperature of the lubricating oil itself increases to avoid solidification. See the attached Figure 7 The bottom of the oil storage tank 7 is connected with the oil outlet on one side of the oil collecting hopper 13 through the recovery pipe 4, so as to realize the oil being pumped into the interior of the oil storage tank 7, wherein the interior of the oil collecting hopper 13 is provided with a filter screen to filter the oil, and the oil collecting hopper 13 is fixedly installed at the bottom of the oil suction box 14, so as to realize the recycling and reuse of the lubricating oil, reduce the operating cost, reduce the waste of the lubricating oil, and also benefit the environmental protection, and the oil suction box 14 is installed on the coal mill gear box 1, and an opening is provided in the middle of one side of the coal mill gear box 1, and a box door 12 is installed at the opening by bolts, so as to observe the two gears inside the coal mill gear box 1, and the diameter of the upper gear inside the coal mill gear box 1 is larger than the diameter of the lower gear inside the coal mill gear box 1, and the outer wall of the coal mill gear box 1 is provided with cooling fins on both sides to assist the heat dissipation, thereby extending the service life of the gear;

[0040] Please see attached Figure 4 - Attachment Figure 6 , one side of the oil storage tank 7 is connected to a pump body 6 with two liquid outlets, and the two liquid outlets of the pump body 6 are connected to the nozzle 18 inside the coal mill gear box 1 through the oil filling pipe 9. The nozzle 18 is stored in the box 15 by the drive of the electric push rod 2, wherein the spray box 15 is located on both sides of the coal mill gear box 1, and the nozzle 18 is connected to the oil filling pipe 9 through a telescopic tube. The bottom of the nozzle 18 is connected to the top of the slide 16 through a torsion spring, and the slide 16 is located in the spray box 15 and slides horizontally. The end of the slide 16 is connected to the telescopic end of the electric push rod 2, and the electric push rod 2 is located on both sides of the outer wall of the coal mill gear box 1. After the spraying is completed, the electric push rod 2 moves in the opposite direction to pull the nozzle 18 back into the spray box 15, restore it to the initial storage state, and wait for the next spraying, so as to control the nozzle 18 in the storage state when it is not in use, avoid the nozzle 18 from being blocked due to exposure to the air, and ensure the efficiency of lubricating oil spraying. Figure 2 , both sides of the coal mill gearbox 1 are fixedly connected with couplings 11, and the size of the couplings 11 gradually decreases from top to bottom, and the middle and bottom couplings 11 are connected to the chassis 3 through shafts;

[0041] Please see attached Fig. 9 - Attachment Fig.10A cavity is provided on the other side of the oil storage tank 7, and a motor 21 is placed in the cavity. The other side of the oil storage tank 7 is connected to the motor 21 through a mounting plate 22, wherein the mounting plate 22 located on the outer wall of the motor 21 is double-layered, and the inner layer is used to connect with the adapter 10. A support seat 23 is fixedly connected to the bottom of the adapter 10. A sleeve 24 is also fixedly connected to the other side of the oil storage tank 7 for wrapping the outer wall of the motor 21. The outer wall of the transmission end of the adapter 10 is connected to the chassis 3, and the sprocket 26 and sprocket 1 25 rotating inside the chassis 3 have a diameter of the sprocket 26 greater than that of the lower sprocket 1 25. The sprocket 26 and the sprocket 1 25 are connected by a chain 27. Through the transmission of the chain 27, the sprocket 1 25 will rotate at different speeds. The sprocket 26 is connected to the middle coupling 11 through a shaft, and the sprocket 1 25 is connected to the bottom coupling 11 through a shaft to change the speed of the motor 21 and transmit it to the turntable 19. The corrugated oil-absorbing sponge 20 sleeved on the outer wall of the turntable 19 is rotated to absorb and spread the oil on the gear on the lower side of the coal mill gear box 1. As the gear rotates, the oil-absorbing sponge 20 absorbs excess lubricating oil on the gear (including the lubricating oil that flows down after spraying and the lubricating oil brought out during the operation of the gear).

[0042] Embodiment 2:

[0043] As another aspect of the present invention, please refer to the attached Fig.11 , different from the technical solution provided inside the above-mentioned chassis 3, this embodiment 2 proposes a gear 29 and a gear 1 28 that rotate in the chassis 3. The diameter of the gear 29 is larger than the diameter of the lower gear 1 28. The gear 29 and the gear 1 28 are meshed with each other. The gear 29 is connected to the middle coupling 11 through a shaft, and the gear 1 28 is connected to the bottom coupling 11 through a shaft. The power of the motor is transmitted to the gear 2 29 through the adapter. Since the diameter of the gear 29 is larger than that of the gear 1 28, the gear 1 28 will rotate at a different speed. At this time, the gear 1 28 drives the turntable 19 to rotate, and the corrugated oil-absorbing sponge 20 sleeved on its outer wall contacts the gear on the lower side of the coal mill gear box 1, and then absorbs and spreads it. As the gear rotates, the oil-absorbing sponge 20 absorbs excess lubricating oil on the gear (including the lubricating oil that flows down after spraying and the lubricating oil brought out during the operation of the gear).

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large gear oil spraying device for a coal mill in a power plant, characterized in that: The invention comprises an oil storage tank (7) for storing oil, one side of the oil storage tank (7) is connected to a pump body (6) provided with two liquid outlets, the two liquid outlets of the pump body (6) are connected to a spray assembly inside a coal mill gear box (1) through an oil injection pipe (9), the spray assembly is stored by the drive of an electric push rod (2), the other side of the oil storage tank (7) is provided with a cavity, and a motor (21) is installed in the cavity, and two cooling pipes (17) inside the oil storage tank (7) are spirally connected. The motor (21) is located on the outer wall of the motor (21) to achieve energy transfer with the motor (21); an adapter (10) is installed on one side of the motor (21) located at the driving end; the outer wall of the transmission end of the adapter (10) is connected to the chassis (3); a speed regulating transmission component is arranged inside the chassis (3) to change the rotation speed of the motor (21) and transmit it to the oil suction component; the oil suction component is located inside the oil suction box (14), wherein the oil suction box (14) is installed on the gear box (1) of the coal mill.

2. The large gear oil spraying device for coal mill in power plant according to claim 1, characterized in that: Couplings (11) are fixedly connected to both sides of the coal mill gearbox (1), and the size of the couplings (11) gradually decreases from top to bottom. The couplings (11) in the middle and bottom are connected to the chassis (3) through shafts.

3. The large gear oil spraying device for coal mill in power plant according to claim 1, characterized in that: The bottom of the oil storage box (7) is fixedly connected to a base (5), the oil filling port at the top of the oil storage box (7) is connected to a cover plate (8) via a torsion spring, and the bottom edge of the cover plate (8) is fixedly connected to a sealing ring to seal the oil filling port.

4. The large gear oil spraying device for coal mill in power plant according to claim 1 is characterized in that: The oil storage tank (7) is connected to the motor (21) by means of a mounting plate (22), wherein the mounting plate (22) located on the outer wall of the motor (21) is double-layered, and the inner layer is used to connect to the adapter (10). A support seat (23) is fixedly connected to the bottom of the adapter (10), and a casing (24) is fixedly connected to the other side of the oil storage tank (7) for wrapping the outer wall of the motor (21).

5. The large gear oil spraying device for coal mill in power plant according to claim 1, characterized in that: An opening is provided in the middle of one side of the coal mill gear box (1), and a box door (12) is installed at the opening by means of bolts for observing two gears inside the coal mill gear box (1). The diameter of the upper gear inside the coal mill gear box (1) is greater than the diameter of the lower gear inside the coal mill gear box (1). Heat dissipation fins are provided on both sides of the outer wall of the coal mill gear box (1).

6. The oil spraying device for large gear of coal mill in power plant according to claim 1, characterized in that: The spray assembly comprises spray boxes (15) located on both sides of the inside of a coal mill gearbox (1), and the spray box (15) is located between two gears. The inside of the spray box (15) is horizontally slidably connected to a slide seat (16). The top of the slide seat (16) is connected to a spray head (18) via a torsion spring. The spray head (18) is connected to an oil injection pipe (9) via a telescopic tube. The end of the slide seat (16) is connected to the telescopic end of an electric push rod (2). The electric push rod (2) is located on both sides of the outer wall of the coal mill gearbox (1).

7. The oil spraying device for large gear of coal mill in power plant according to claim 1, characterized in that: The oil suction assembly comprises a turntable (19) located inside the oil suction box (14) and rotating. The outer wall of the turntable (19) is provided with a corrugated oil absorption sponge (20). The oil absorption sponge (20) is in close contact with the gear on the lower side of the inner side of the coal mill gear box (1). The turntable (19) is connected to the coupling (11) on the lower side of the outer wall of the coal mill gear box (1) through a shaft so as to rotate under the guidance of the speed control transmission assembly.

8. The oil spraying device for large gear of coal mill in power plant according to claim 7, characterized in that: The bottom of the oil suction box (14) is fixedly connected to an oil collecting hopper (13), and an oil outlet on one side of the oil collecting hopper (13) is connected to the bottom of the oil storage box (7) through a recovery pipe (4) so ​​as to pump the oil into the interior of the oil storage box (7). A filter screen is arranged inside the oil collecting hopper (13) so as to filter the oil.

9. The large gear oil spraying device for coal mill in power plant according to claim 1, characterized in that: The speed regulating transmission component comprises a sprocket wheel 2 (26) and a sprocket wheel 1 (25) which are located inside the chassis (3) and rotate. The diameter of the sprocket wheel 2 (26) is larger than the diameter of the lower sprocket wheel 1 (25). The sprocket wheel 2 (26) and the sprocket wheel 1 (25) are connected via a chain (27). The sprocket wheel 2 (26) is connected to the middle coupling (11) via a shaft, and the sprocket wheel 1 (25) is connected to the bottom coupling (11) via a shaft.

10. The large gear oil spraying device for coal mill in power plant according to claim 1, characterized in that: The speed regulating transmission component also includes a second gear (29) and a first gear (28) which are located inside the chassis (3) and rotate. The diameter of the second gear (29) is larger than the diameter of the lower gear (28). The second gear (29) and the first gear (28) are meshed with each other. The second gear (29) is connected to the middle coupling (11) through a shaft, and the first gear (28) is connected to the bottom coupling (11) through a shaft.

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