Mill lubricating oil station protected by bearing bush in case of power failure

Abstract

The utility model discloses an outage bearing bush protection mill lubricating oil station which comprises an oil tank and an energy accumulator, the oil tank is communicated with six second oil pumps, four of the six second oil pumps are main high-pressure oil pumps, the liquid outlet end of each main high-pressure oil pump is communicated with a main oil supply pipeline, and the end of each main oil supply pipeline is communicated with an oil supply port; by additionally arranging the standby oil supply pipeline, the pressure increasing value of the energy accumulator is increased, it can be ensured that the bearing bush still has stable oil supply after power failure or an oil station oil pump breaks down, and the bearing bush burning accident is completely eradicated; by adding a first pressure sensor, a second pressure sensor and a pressure gauge for cooperative use, the stable pressure of lubricating oil in the energy accumulator can be guaranteed; the oil supply system of the oil station is adjusted through the standby oil supply pipeline, needed lubricating oil can be supplemented in time, the situation of oil loss and pressure loss of a bearing of the mill is effectively eradicated, and therefore reliable shutdown of the mill is protected in the first time, and the reliability of the system is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mill lubricating oil stations, in particular to a mill lubricating oil station for protecting a bearing bush from power failure. Background Art

[0002] Large grinding mills are usually supported by sliding bearings, so the requirements for lubricating oil stations are relatively high. If there is a sudden power outage in the factory, or a high-pressure oil pump fails, the oil pressure will drop instantly. Since the mill body has a large inertia during operation, it takes a certain amount of time from normal operation to complete stop. During this period of time, the lack of lubricating oil is very likely to cause the bearing to burn out, which will cause significant economic losses. Usually, the protection logic of the oil station design is to send an alarm signal when the oil pressure is lower than the set value and start the backup oil pump. Since it takes a process for the backup pump to reach normal pressure from start-up, and in addition, the parallel pipeline of the backup pump belongs to a normal pressure system, there is a small amount of air in the pipeline, and the oil pressure cannot be maintained for a short time when the backup pump is started. This leads to insufficient oil supply to the bearing. In addition, if there is a sudden power outage in the factory, the oil station stops working without a backup power supply. In order to ensure normal oil supply during the mill stop stage, an accumulator must be equipped to maintain the mill stop.

[0003] In order to solve the purpose of protecting the bearing in the case of power outage, the following methods are currently used:

[0004] The accumulator is directly connected in parallel to the high-pressure pipeline of the oil station. The oil supply to the accumulator comes from the main high-pressure oil pump of the oil station. This connection method makes the oil pressure in the high-pressure oil supply port and the oil pressure in the accumulator equal. When the oil station fails or the power is cut off, the oil pressure and flow in the accumulator are not enough to maintain the shutdown process of the mill, and the protective effect is very small.

[0005] For this reason, we propose a lubricating oil station for protecting the mill with power-off bearing. Utility Model Content

[0006] The utility model aims to provide a lubricating oil station for protecting a mill with a power-off bearing, so as to solve the problems raised by the above-mentioned background technology.

[0007] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0008] A lubricating oil station for protecting a mill with a power-off bearing, comprising:

[0009] The oil tank and the accumulator, the oil tank is connected with six second oil pumps, four of which are main high-pressure oil pumps, and the other two are auxiliary high-pressure oil pumps. The liquid outlet of each main high-pressure oil pump is connected with a main oil supply pipeline, and the end of each main oil supply pipeline is connected with an oil supply port. Each main oil supply pipeline is connected with a spare oil supply pipeline, and two spare oil supply pipelines form a group. The two groups of spare oil supply pipelines are connected with the liquid outlets of the two auxiliary high-pressure oil pumps one by one. The liquid outlet of the auxiliary high-pressure oil pump is equipped with an electromagnetic The reversing valve is provided with four accumulators, and the liquid outlet ends of the four accumulators are connected to four main oil supply pipelines one by one respectively. The liquid outlet ends of the accumulators are installed with electromagnetic on-off valves and throttle valves. The liquid inlet ends of the four accumulators are commonly connected to an oil pipeline. The end of the oil pipeline away from the accumulator is connected to a first oil pump. The liquid inlet end of the first oil pump is connected to the oil tank. Pressure gauges are respectively installed on the oil pipeline and the main oil supply pipeline. A first pressure sensor is also installed on the main oil supply pipeline, and a second pressure sensor is also installed on the oil pipeline.

[0010] As a preferred technical solution, one side of the oil tank is connected to an oil drain pipe, a liquid level gauge is installed in the oil tank, a heater and a platinum thermal resistor are also installed in the inner cavity of the oil tank, an exhaust pipe is connected to the oil tank, and an air filter is installed on the exhaust pipe.

[0011] As a preferred technical solution, the oil tank is divided into an oil supply area and an oil return area. The liquid inlet ends of the main high-pressure oil pump, the auxiliary high-pressure oil pump and the first oil pump are respectively connected to the oil supply area of ​​the oil tank. The oil tank is connected to an oil return pipe connected to the oil return area, and a return oil filter is installed on the oil return pipe.

[0012] As a preferred technical solution, the oil return area of ​​the oil tank is connected to two circulation pumps, the liquid outlet ends of the two circulation pumps are commonly connected to a circulation pipe, the other end of the circulation pipe is connected to the oil supply area of ​​the oil tank, and a cooler and a third pressure sensor are installed on the circulation pipe in sequence along the circulation direction of the lubricating oil, and one pressure gauge is installed on the circulation pipe.

[0013] As a preferred technical solution, the circulation pipeline, the main oil supply pipeline, the backup oil supply pipeline and the oil pipeline are respectively connected with overflow pipelines, the other end of the overflow pipeline is connected with the oil tank, the overflow pipeline connected with the oil pipeline is installed with a first overflow valve, and the remaining overflow pipelines are all installed with a second overflow valve, and the circulation pipeline, the main oil supply pipeline, the backup oil supply pipeline and the oil pipeline are respectively installed with a one-way valve.

[0014] As a preferred technical solution, high-pressure filters are installed on both the main oil supply pipeline and the circulation pipeline.

[0015] As a preferred technical solution, the four oil supply ports are respectively divided into high-pressure oil supply port a, high-pressure oil supply port b, high-pressure oil supply port c and high-pressure oil supply port d.

[0016] As a preferred technical solution, the oil tank is equipped with a controller which is electrically connected to the circulating pump, the first pressure sensor, the pressure gauge, the electromagnetic on-off valve, the throttle valve, the second pressure sensor, the electromagnetic reversing valve, the first oil pump, the first overflow valve, the heater, the second overflow valve, the second oil pump, the liquid level gauge, the third pressure sensor and the platinum thermal resistor respectively. The controller is used to adjust the working states or parameters of the circulating pump, the first pressure sensor, the pressure gauge, the electromagnetic on-off valve, the throttle valve, the second pressure sensor, the electromagnetic reversing valve, the first oil pump, the first overflow valve, the heater, the second overflow valve, the second oil pump, the liquid level gauge, the third pressure sensor and the platinum thermal resistor, and to receive the pressure information transmitted by the first pressure sensor, the second pressure sensor and the third pressure sensor, the liquid level information transmitted by the liquid level gauge and the temperature information transmitted by the platinum thermal resistor.

[0017] The utility model has at least the following beneficial effects:

[0018] The beneficial effect of the utility model of the present application is that, by adding an independent spare oil supply pipeline to the accumulator, the boost value of the accumulator is improved, which can ensure that the bearing shells still have a stable oil supply after a power outage or a failure of the oil pump at the oil station, thereby preventing the bearing shells from burning out; by adding the first pressure sensor, the second pressure sensor and the pressure gauge for coordinated use, the stable pressure of the lubricating oil in the accumulator can be guaranteed; in addition, by the coordinated use of the electromagnetic on-off valve and the throttle valve, it can be ensured that the oil is replenished in time when the oil station is powered off or the pressure at the oil supply port drops suddenly. Therefore, the power-off bearing shell protection mill lubricating oil station not only increases the measurement accuracy, but also enables the power-off bearing shell protection mill lubricating oil station to have the function of uninterrupted oil supply. By adjusting the oil supply system of the oil station through the spare oil supply pipeline, the required lubricating oil can be replenished in time, effectively preventing the mill bearings from losing oil and pressure, thereby protecting the mill from reliable shutdown at the first time, and greatly improving the reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a structural schematic diagram of a lubricating oil station for protecting a mill with a power-off bearing.

[0020] In the figure: 1. circulation pump; 2. cooler; 3. main oil supply pipeline; 4. oil supply port; 5. first pressure sensor; 6. pressure gauge; 7. electromagnetic on-off valve; 8. accumulator; 9. oil pipeline; 10. throttle valve; 11. high-pressure filter; 12. second pressure sensor; 13. electromagnetic reversing valve; 14. first oil pump; 15. first overflow valve; 16. air filter; 17. heater; 18. second overflow valve; 19. second oil pump; 20. level gauge; 21. third pressure sensor. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1 , an embodiment of the utility model provides a power-off bearing protection mill lubricating oil station, including: an oil tank and an accumulator 8, six second oil pumps 19 are connected to the oil tank, four of which are main high-pressure oil pumps, and the other two second oil pumps 19 are auxiliary high-pressure oil pumps, and the liquid outlet of each main high-pressure oil pump is respectively connected to a main oil supply pipeline 3, and the end of each main oil supply pipeline 3 is connected to an oil supply port 4, and each main oil supply pipeline 3 is respectively connected to a spare oil supply pipeline, and the two spare oil supply pipelines form a group, and the two groups of spare oil supply pipelines are respectively connected to the liquid outlets of the two auxiliary high-pressure oil pumps one by one, and an electromagnetic reversing valve 13 is installed on the liquid outlet of the auxiliary high-pressure oil pump, and the electromagnetic reversing valve 13 is a two-position four-way electromagnetic valve. The accumulator 8 is provided with four The liquid outlet ends of the four accumulators 8 are connected to the four main oil supply pipelines 3 one by one, and the liquid outlet ends of the accumulators 8 are respectively connected to the four main oil supply pipelines 3. The electromagnetic on-off valve 7 and the throttle valve 10 are installed on the liquid outlet end of the accumulator 8. The electromagnetic on-off valve 7 is in a normally closed state. The electromagnetic on-off valve 7 is close to the accumulator 8. The liquid inlet ends of the four accumulators 8 are commonly connected to an oil pipeline 9. The end of the oil pipeline 9 away from the accumulator 8 is connected to a first oil pump 14. The liquid inlet end of the first oil pump 14 is connected to the oil tank. Pressure gauges 6 are respectively installed on the oil pipeline 9 and the main oil supply pipeline 3. A first pressure sensor 5 is also installed on the main oil supply pipeline 3. The first pressure sensor 5 is close to the oil supply port 4. A second pressure sensor 12 is also installed on the oil pipeline 9. The second pressure sensor 12 is close to the first oil pump 14.

[0023] Among them, one side of the oil tank is connected to an oil drain pipe, a liquid level meter 20 is installed in the oil tank, a heater 17 and a platinum thermal resistor are also installed in the inner cavity of the oil tank, an exhaust pipe is connected to the oil tank, and an air filter 16 is installed on the exhaust pipe, so as to be suitable for the mill used in cold areas.

[0024] Among them, the oil tank is divided into an oil supply area and an oil return area. The liquid inlet ends of the main high-pressure oil pump, the auxiliary high-pressure oil pump and the first oil pump 14 are respectively connected to the oil supply area of ​​the oil tank. The oil tank is connected to a return oil pipe connected to the oil return area. The return oil pipe is installed with a return oil filter, which can filter impurities in the return oil.

[0025] Among them, the oil return area of ​​the oil tank is connected to two circulation pumps 1, the liquid outlet ends of the two circulation pumps 1 are commonly connected to a circulation pipe, the other end of the circulation pipe is connected to the oil supply area of ​​the oil tank, and the circulation pipe is sequentially installed with a cooler 2 and a third pressure sensor 21 along the circulation direction of the lubricating oil. A pressure gauge 6 is installed on the circulation pipe. By starting the circulation pump 1, the lubricating oil in the oil return area can be transported to the circulation pipe and cooled through the cooler 2 for subsequent oil supply operations.

[0026] Among them, the circulation pipeline, the main oil supply pipeline 3, the backup oil supply pipeline and the oil pipeline 9 are respectively connected with overflow pipelines, the other end of the overflow pipeline is connected with the oil tank, the overflow pipeline connected with the oil pipeline 9 is installed with a first overflow valve 15, and the remaining overflow pipelines are installed with a second overflow valve 18, and the circulation pipeline, the main oil supply pipeline 3, the backup oil supply pipeline and the oil pipeline 9 are respectively installed with check valves.

[0027] Wherein, high-pressure filters 11 are installed on both the main oil supply pipeline 3 and the circulation pipeline, which can filter the lubricating oil supplied to the oil supply port 4 and the circulation pipeline.

[0028] The four fuel supply ports 4 are divided into a high pressure fuel supply port a, a high pressure fuel supply port b, a high pressure fuel supply port c and a high pressure fuel supply port d in sequence.

[0029] The oil tank is provided with a controller which is electrically connected to the circulating pump 1, the first pressure sensor 5, the pressure gauge 6, the electromagnetic on-off valve 7, the throttle valve 10, the second pressure sensor 12, the electromagnetic reversing valve 13, the first oil pump 14, the first overflow valve 15, the heater 17, the second overflow valve 18, the second oil pump 19, the liquid level gauge 20, the third pressure sensor 21, the platinum thermal resistor, etc. The controller is used to adjust the circulating pump 1, the first pressure sensor 5, the pressure gauge 6, the electromagnetic on-off valve 7, the throttle valve 10, the second pressure sensor The controller can use a DSP controller with model TMS320F2812 for the working status or parameters of the sensor 12, the electromagnetic reversing valve 13, the first oil pump 14, the first relief valve 15, the heater 17, the second relief valve 18, the second oil pump 19, the liquid level gauge 20, the third pressure sensor 21 and the platinum thermal resistor, and receive the pressure information transmitted by the first pressure sensor 5, the second pressure sensor 12 and the third pressure sensor 21, the liquid level information transmitted by the liquid level gauge 20 and the temperature information transmitted by the platinum thermal resistor.

[0030] The working principle of the utility model is:

[0031] Open the lubrication oil station before starting the mill;

[0032] When the lubricating oil station is started, the electromagnetic on-off valve 7 is in a de-energized conduction state, the circulating pump 1 starts working first, and after the level gauge 20 detects the liquid level in the oil tank and the third pressure sensor 21 detects that the liquid level and pressure in the oil tank are normal, the main high-pressure oil pump starts working, so that the lubricating oil in the oil tank is supplied through the main oil supply pipeline 3 and the oil supply port 4 in turn; at this time, the accumulator 8 and the main oil supply pipeline 3 are in a conduction state, and the accumulator 8 can absorb part of the pressure shock to protect the main oil supply pipeline 3. The first pressure sensor 5 detects the high-pressure oil pressure in the main oil supply pipeline 3. After reaching the set value and the oil pressure is stable, it sends an oil station ready signal to the controller, the electromagnetic on-off valve 7 is energized to disconnect the oil circuit, and the mill can be started;

[0033] When the mill is ready to start, the controller simultaneously issues a command to start the first oil pump 14, and the accumulator 8 continues to be supplied with oil by the first oil pump 14 and the oil pipeline 9. The second pressure sensor 12 detects the high-pressure oil pressure in the oil pipeline 9. When the pressure reaches the preset upper limit, the first oil pump 14 is stopped, and the accumulator 8 is in a pressure-maintaining state. At this time, the lubricating oil pressure in the accumulator 8 is higher than the pressure in the main oil supply pipeline 3.

[0034] When the mill is in normal operation, if the oil pressure in the inner cavity of a main oil supply pipeline 3 suddenly drops, the first pressure sensor 5 sends a signal to the controller, and the electromagnetic on-off valve 7 connected to the accumulator 8 on the corresponding pipeline loses power. The accumulator 8 first replenishes lubricating oil to the main oil supply pipeline 3, and at the same time, the electromagnetic reversing valve 13 is energized to start the standby high-pressure pump. After the standby high-pressure pump has been running for 3 seconds, the electromagnetic on-off valve 7 is energized to disconnect the main oil supply pipeline 3 corresponding to the accumulator 8; when an unexpected situation occurs and the standby high-pressure pump cannot be started, the controller will keep the electromagnetic on-off valve 7 of the corresponding pipeline in a power-off state, and the accumulator 8 will continue to supply oil. After the pressure of the accumulator 8 drops to the set lower limit value, the first oil pump 14 is started. After the maintenance is completed, the first oil pump 14 continues to supply oil to the accumulator 8 through the oil pipeline 9 until the set value is reached;

[0035] When the factory unexpectedly loses power, the electromagnetic on-off valves 7 are all powered off and on, and the accumulator 8 continues to supply oil to the oil supply port 4 until the mill stops running, ensuring that the bearing is not damaged. The throttle valve 10 on the corresponding main oil supply pipeline 3 can be adjusted according to the on-site situation to ensure the oil supply speed of the accumulator 8;

[0036] Therefore, it can be ensured that when the oil pump of the lubricating oil station fails or the power is cut off in the factory, the accumulator 8 has enough lubricating oil to supply the mill bearings, so as to protect the mill from normal shutdown and prevent the accident of burning bearings.

[0037] Parts not involved in the present invention are the same as the prior art or can be implemented by the prior art. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A power-off bearing protection mill lubricating oil station, characterized in that: include: An oil tank and an accumulator (8), wherein the oil tank is connected to six second oil pumps (19), four of which are main high-pressure oil pumps, and the other two are auxiliary high-pressure oil pumps. The liquid outlet of each main high-pressure oil pump is connected to a main oil supply pipeline (3), and the end of each main oil supply pipeline (3) is connected to an oil supply port (4). Each main oil supply pipeline (3) is connected to a spare oil supply pipeline, and two spare oil supply pipelines form a group. The two groups of spare oil supply pipelines are connected to the liquid outlets of the two auxiliary high-pressure oil pumps one by one. The liquid outlet of the auxiliary high-pressure oil pump is equipped with an electromagnetic reversing valve (13). The accumulator (8) is provided with four The four accumulators (8) are connected to four main oil supply pipelines (3) one by one, and the liquid outlet ends of the four accumulators (8) are connected to four main oil supply pipelines (3) one by one. The liquid outlet ends of the accumulators (8) are installed with electromagnetic on-off valves (7) and throttle valves (10). The liquid inlet ends of the four accumulators (8) are connected to an oil pipeline (9) in common. The end of the oil pipeline (9) away from the accumulator (8) is connected to a first oil pump (14). The liquid inlet end of the first oil pump (14) is connected to an oil tank. Pressure gauges (6) are installed on the oil pipeline (9) and the main oil supply pipeline (3), respectively. A first pressure sensor (5) is also installed on the main oil supply pipeline (3), and a second pressure sensor (12) is also installed on the oil pipeline (9).

2. The lubricating oil station for protecting a mill with a power-off bearing according to claim 1, characterized in that: One side of the oil tank is connected to an oil drain pipe, a liquid level meter (20) is installed in the oil tank, a heater (17) and a platinum thermal resistor are also installed in the inner cavity of the oil tank, an exhaust pipe is connected to the oil tank, and an air filter (16) is installed on the exhaust pipe.

3. The lubricating oil station for protecting a mill with a power-off bearing according to claim 2, characterized in that: The oil tank is divided into an oil supply area and an oil return area. The oil tank is connected with an oil return pipe connected with the oil return area, and an oil return filter is installed on the oil return pipe.

4. The lubricating oil station for protecting a mill with a power-off bearing according to claim 3 is characterized by: The oil return area of ​​the oil tank is connected to two circulation pumps (1), the liquid outlet ends of the two circulation pumps (1) are commonly connected to a circulation pipeline, the other end of the circulation pipeline is connected to the oil supply area of ​​the oil tank, a cooler (2) and a third pressure sensor (21) are sequentially installed on the circulation pipeline along the circulation direction of the lubricating oil, and one pressure gauge (6) is installed on the circulation pipeline.

5. The lubricating oil station for protecting a mill with a power-off bearing according to claim 4 is characterized by: The circulation pipeline, the main oil supply pipeline (3), the standby oil supply pipeline and the oil delivery pipeline (9) are respectively connected to overflow pipelines, the other end of the overflow pipeline is connected to the oil tank, the overflow pipeline connected to the oil delivery pipeline (9) is installed with a first overflow valve (15), and the remaining overflow pipelines are all installed with a second overflow valve (18), and the circulation pipeline, the main oil supply pipeline (3), the standby oil supply pipeline and the oil delivery pipeline (9) are respectively installed with a check valve.

6. The lubricating oil station for protecting a mill with a power-off bearing according to claim 1, characterized in that: The main oil supply pipeline (3) and the circulation pipeline are both installed with a high-pressure filter (11).

7. The lubricating oil station for protecting a mill with a power-off bearing according to claim 1, characterized in that: The four oil supply ports (4) are respectively divided into a high-pressure oil supply port a, a high-pressure oil supply port b, a high-pressure oil supply port c and a high-pressure oil supply port d.

8. The lubricating oil station for protecting a mill with a power-off bearing according to claim 5, characterized in that: The oil tank is provided with a controller which is electrically connected to the circulation pump (1), the first pressure sensor (5), the pressure gauge (6), the electromagnetic on-off valve (7), the throttle valve (10), the second pressure sensor (12), the electromagnetic reversing valve (13), the first oil pump (14), the first overflow valve (15), the heater (17), the second overflow valve (18), the second oil pump (19), the liquid level gauge (20), the third pressure sensor (21) and the platinum thermal resistor. The controller is used to adjust the circulation pump (1), the first pressure sensor (5), the pressure gauge (6), the electromagnetic on-off valve (7), the throttle valve (10), the second pressure sensor (12), the electromagnetic reversing valve (13), the first oil pump (14), the first overflow valve (15), the heater (17), the second overflow valve (18), the second oil pump (19), the liquid level gauge (20), the third pressure sensor (21) and the platinum thermal resistor. The device comprises an on-off valve (7), a throttle valve (10), a second pressure sensor (12), an electromagnetic reversing valve (13), a first oil pump (14), a first overflow valve (15), a heater (17), a second overflow valve (18), a second oil pump (19), a liquid level meter (20), a third pressure sensor (21) and a platinum thermal resistor for receiving operating states or parameters thereof, and receiving pressure information transmitted by the first pressure sensor (5), the second pressure sensor (12) and the third pressure sensor (21), liquid level information transmitted by the liquid level meter (20) and temperature information transmitted by the platinum thermal resistor.

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