Thin oil lubrication station of coal mill

Abstract

The utility model discloses a thin oil lubrication station of a coal mill, and relates to the technical field of thin oil equipment. Comprising a lubricating oil flow guide system; the motor pump set, the filtering system and the cooling system are arranged on a pipeline of the lubricating oil flow guide system. A system capable of pressurizing, filtering and cooling lubricating oil is formed by the cooling system, the lubricating oil flow guide system, the motor pump set and the filtering system, friction parts of a machine can be lubricated during use, and friction between the friction parts of the machine is reduced; through the arrangement of the double-cylinder filter, super-running standard granular impurities in lubricating oil flowing in the lubricating oil flow guide system can be filtered, the working states of the two filter cylinders are switched at the same time, the filter elements are replaced according to needs, and the filtering effect on the super-running standard granular impurities in the lubricating oil is effectively guaranteed; the problem that granular impurities exceeding the operation standard in lubricating oil cannot be effectively filtered in an existing thin oil lubrication station is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of thin oil equipment, in particular to a thin oil lubrication station for a coal mill. Background Art

[0002] Coal mill is a machine used to crush coal blocks and grind them into coal powder, and is an important auxiliary equipment for pulverized coal furnace. In the thin oil circulation lubrication system of the coal mill, the main function of the coal mill thin oil lubrication station is to force the lubricating oil to the friction parts of the machine to reduce the friction between the friction parts of the machine, thereby protecting the user's mechanical equipment in the best lubrication state, reducing equipment failures, extending the service life of the equipment, helping users save costs and improve productivity.

[0003] The traditional thin oil lubrication station only has the function of conveying and pressurizing, so that the lubricating oil can reach the friction parts of each machine, thereby reducing friction. However, in actual use, due to the friction of the machine friction parts during use, the friction will produce debris and debris, and there will be dust and other granular impurities between the gaps of the machine friction parts, which will produce granular impurities exceeding the operating standard in the lubricating oil, which will seriously affect the lubricating effect of the lubricating oil and the service life of the equipment.

[0004] Based on this, the utility model proposes a coal mill thin oil lubrication station to filter the granular impurities exceeding the operating standard in the lubricating oil, thereby solving the problems existing in the above-mentioned prior art. Utility Model Content

[0005] In view of this, the main purpose of the utility model is to provide a coal mill thin oil lubrication station to solve the problem that the existing thin oil lubrication station cannot effectively filter the particulate impurities exceeding the operating standard in the lubricating oil.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A coal mill thin oil lubrication station, comprising:

[0008] Lubricating oil diversion system;

[0009] And, arranged on the lubricating oil diversion system pipeline:

[0010] The motor pump group is arranged at the lubricating oil inlet end of the lubricating oil diversion system;

[0011] A filtering system, arranged on a pipeline of a lubricating oil diversion system between the motor pump unit and the cooling system, including a filter;

[0012] The cooling system is arranged at the lubricating oil outlet end of the lubricating oil guiding system and comprises a cooler.

[0013] In a preferred embodiment, the lubricating oil diversion system comprises:

[0014] The oil inlet pipe has open ends at both ends, and oil inlets are provided at the ends of the oil inlet pipe;

[0015] A first oil guide pipe, one end of which is connected to the oil inlet pipe, and the other end of which is connected to the motor pump group respectively;

[0016] A second oil guide pipe, one end of which is connected to the oil inlet passage of the filter, and the other end of which is connected to the motor pump unit;

[0017] A third oil guide pipe, one end of which is connected to the duplex filter, and the other end of which is connected to the cooler;

[0018] The drain oil pipe is connected to the cooler, and oil outlets are arranged at both ends of the drain oil pipe.

[0019] In a preferred embodiment, the first oil guide pipe is connected to the motor pump assembly via a connecting branch, and a first butterfly valve is provided on the connecting branch.

[0020] In a preferred embodiment, the second oil guide pipe is connected to the motor pump assembly via a connecting branch, and a check valve and a second butterfly valve are provided on the connecting branch.

[0021] In a preferred embodiment, the second oil guide pipe and the oil discharge pipe are both provided with a first pressure detection gauge and a bimetallic thermometer.

[0022] In a preferred embodiment, a pressure switch is provided on one end of the drain oil pipe close to the oil outlet.

[0023] In a preferred embodiment, a bypass branch is provided between the liquid oil inlet pipe and the third oil guide pipe, and a flow valve and a differential pressure gauge are provided on the bypass branch.

[0024] In a preferred embodiment, the filter is a double-tube filter disposed between the second oil conduit and the third oil conduit, comprising:

[0025] The filter cartridge is connected to one end of the switching valve housing through a connecting pipe;

[0026] A filter element is arranged in the filter cartridge;

[0027] The switching valve housing is arranged between two symmetrically arranged filter cartridges, and a switching valve core is arranged in the switching valve housing. The switching valve core is provided with flow guide holes which match the connecting pipe, the second oil guide pipe and the third oil guide pipe respectively.

[0028] In a preferred embodiment, an air bleed plug is provided on the filter cartridge cover at the upper end of the filter cartridge, and an oil drain plug is provided at the lower end of the filter cartridge.

[0029] In a preferred embodiment, an oil pressure detection branch is provided at the oil inlet and the oil outlet of the filter, and the two ends of the oil pressure detection branch are respectively connected to the second oil guide pipe and the third oil guide pipe, and a second control valve, a second pressure gauge and a third control valve are provided on the oil pressure detection branch, and the second pressure gauge is provided between the second control valve and the third control valve.

[0030] Compared with the prior art, the utility model provides a coal mill thin oil lubrication station, which has the following beneficial effects:

[0031] 1. Through the setting of cooling system, lubricating oil diversion system, motor pump group and filtering system, a system capable of pressurizing, filtering and cooling lubricating oil is formed, which can lubricate the friction parts of the machine during use and reduce the friction between the friction parts of the machine;

[0032] 2. Through the setting of the double-tube filter, it is possible to filter the granular impurities exceeding the operating standard in the lubricating oil flowing in the lubricating oil diversion system, and at the same time, the working states of the two filter cartridges can be switched, and the filter element can be replaced as needed, effectively ensuring the filtering effect of the granular impurities exceeding the operating standard in the lubricating oil; it solves the problem that the existing thin oil lubrication station cannot effectively filter the granular impurities exceeding the operating standard in the lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained like these drawings without paying creative work.

[0034] Figure 1 This is a structural schematic diagram of the utility model coal mill thin oil lubrication station;

[0035] Figure 2 This is the front view of the utility model coal mill thin oil lubrication station;

[0036] Figure 3 It is a side view of the utility model coal mill thin oil lubrication station;

[0037] Figure 4 This is a top view of the coal mill oil lubrication station of the utility model;

[0038] Figure 5 This is a schematic diagram of the structure of the filtration system of the utility model;

[0039] Figure 6 It is a cross-sectional view of the switching valve core of the utility model;

[0040] Figure 7 This is the control principle diagram of the utility model coal mill thin oil lubrication station.

[0041]

Main component symbol description

[0042] 1. Cooling system; 1-1. Cooler; 1-2. Cooler water inlet; 1-3. Cooler water outlet; 2. Lubricating oil diversion system; 2-1. Oil inlet pipe; 2-2. Bypass branch; 2-3. Oil inlet; 2-4. Oil outlet; 3. Motor pump unit; 3-1. Check valve; 4. Filter system; 4-1. Filter; 4-1-1. Filter cartridge; 4-1-2. Filter element; 4-1-3. Filter cartridge cover; 4-1-4. Switch valve cover; 4-1-5. Switch valve housing; 4-1- 6. Switching valve core; 4-1-7. Vent plug; 4-1-8. Oil drain plug; 4-2. First oil guide pipe; 4-3. Second oil guide pipe; 4-4. Third oil guide pipe; 4-5. Drain oil pipe; 5. First pressure detection gauge; 6. Bimetallic thermometer; 7. Pressure differential switch; 8. Flow valve; 9. Pressure differential gauge; 10. Pressure switch; 11. First butterfly valve; 12. Second butterfly valve; 13. First control valve; 14. Second control valve; 15. Second pressure gauge; 16. Third control valve. DETAILED DESCRIPTION

[0043] The structure of the coal mill thin oil lubrication station is further described in detail below in conjunction with the accompanying drawings and embodiments of the utility model.

[0044] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0045] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0046] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0047] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0048] As the instruction manual Figure 1-Figure 7 As shown, the utility model provides a technical solution:

[0049] A coal mill thin oil lubrication station comprises a lubricating oil diversion system 2, and a cooling system 1, a motor pump group 3 and a filtering system 4 arranged on the pipeline of the lubricating oil diversion system 2; wherein: the motor pump group 3 is arranged at the lubricating oil inlet end of the lubricating oil diversion system 2, and is used to pressurize the lubricating oil; the filtering system 4 is arranged between the motor pump group 3 and the cooling system 1, and comprises a double-tube filter 4-1, and is used to filter the lubricating oil after being pressurized by the motor pump group 3; the cooling system 1 is arranged at the lubricating oil outlet end of the lubricating oil diversion system 2, and comprises a cooler 1-1, and is used to cool the lubricating oil after being filtered in the lubricating oil diversion system 2.

[0050] It should be noted that in this embodiment, through the arrangement of the above-mentioned cooling system 1, lubricating oil diversion system 2, motor pump group 3 and filtering system 4, a system capable of pressurizing, filtering and cooling lubricating oil is formed, which can lubricate the friction parts of the machine when in use. In specific use: connect the coal mill thin oil lubrication station to the thin oil circulation lubrication system of the coal mill, and then control the corresponding valve to open, so that the lubricating oil can enter the pipeline of the lubricating oil diversion system 2 from the lubricating oil inlet end of the lubricating oil diversion system 2, and then pressurize it through the motor pump group 3 during the flow process, filter it through the filtering system 4, and cool the filtered lubricating oil through the cooling system 1, so that the lubricating oil can enter the friction parts of the machine at a lower temperature, which plays a role in reducing friction.

[0051] As a preferred embodiment, Figure 1 and Figure 2 As shown, the liquid inlet end of the cooler 1-1 is provided with a cooler water inlet 1-2, and the liquid outlet end is provided with a cooler water outlet 1-3. When in use, an external cooler supply source can be connected to the cooler water inlet 1-2 according to use requirements.

[0052] As a preferred embodiment, Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, the lubricating oil flow guiding system 2 includes an inlet oil pipe 2-1, a first oil pipe 4-2, a second oil pipe 4-3, a third oil pipe 4-4 and a drain oil pipe 4-5; wherein: both ends of the inlet oil pipe 2-1 are open ends, and an oil inlet port 2-3 is provided at the end of the inlet oil pipe 2-1, so as to facilitate connection and oil inlet when connected; one end of the first oil pipe 4-2 is connected with the inlet oil pipe 2-1, and the other end is connected with the motor pump group 3 respectively through a tee; one end of the second oil pipe 4-3 is connected with the oil inlet channel of the binocular filter 4-1, and the other end is connected with the motor pump group 3; one end of the third oil pipe 4-4 is connected with the oil outlet channel of the binocular filter 4-1, and the other end is connected with the oil inlet port of the cooler 1-1; the drain oil pipe 4-5 is connected with the oil outlet port of the cooler 1-1 through a tee, and oil outlet ports 2-4 are provided at both ends of the drain oil pipe 4-5.

[0053] It should be noted that, in this embodiment, a lubricating oil passage is formed by the arrangement of the above-mentioned inlet oil pipe 2-1, the first oil guide pipe 4-2, the second oil guide pipe 4-3, the third oil guide pipe 4-4 and the discharge oil pipe 4-5, so that the oil can be introduced through any oil inlet 2-3 during use, and discharged through the oil outlet 2-4 after being pressurized, filtered and cooled.

[0054] In this embodiment, two oil inlets 2-3 are provided on the liquid inlet oil pipe 2-1, and two oil outlets 2-4 are provided on the liquid discharge oil pipe 4-5, so as to facilitate the adaptation and installation of the lubricating oil diversion system 2 when in use. After one oil inlet 2-3 is determined as the liquid inlet, the other oil inlet 2-3 needs to be sealed, and after one oil outlet 2-4 is determined as the liquid outlet, the other oil outlet 2-4 needs to be sealed.

[0055] In this embodiment, a first butterfly valve 11 is further installed on the branch of the first oil guide pipe 4 - 2 for controlling the opening and closing of the branch of the first oil guide pipe 4 - 2 through the first butterfly valve 11 so as to control the lubricating oil entering the motor pump unit 3 .

[0056] In this embodiment, the second oil guide pipe 4-3 is connected to the motor pump group 3 through a connecting branch, and a check valve 3-1 and a second butterfly valve 12 are arranged on the connecting branch. The check valve 3-1 prevents backflow in the connecting branch, and the second butterfly valve 12 controls the opening and closing of the connecting branch. At the same time, a first pressure detection gauge 5 and a bimetallic thermometer 6 are arranged on the second oil guide pipe 4-3 and the drain oil pipe 4-5. The first pressure detection gauge 5 and the bimetallic thermometer 6 are connected to the second oil guide pipe 4-3 through the first control valve 13. When in use, the pressure of the lubricating oil in the second oil guide pipe 4-3 and the drain oil pipe 4-5 is measured by the first pressure detection gauge 5, and the temperature of the lubricating oil in the second oil guide pipe 4-3 and the drain oil pipe 4-5 is measured by the bimetallic thermometer 6.

[0057] In this embodiment, a pressure switch 10 is also provided on one end of the drain oil pipe 4-5 near the oil outlet 2-4. When the pressure of the lubricating oil in the drain oil pipe 4-5 is greater than the set value of the pressure switch 10, the pressure switch 10 automatically opens to provide high-pressure lubricating oil to the friction parts of the machine.

[0058] In this embodiment, a bypass branch 2-2 is further provided between the liquid oil inlet pipe 2-1 and the third oil guide pipe 4-4, and a flow valve 8 is provided on the bypass branch 2-2. The flow in the bypass branch 2-2 is controlled by the flow valve 8, and a pressure differential meter 9 is also provided on the bypass branch 2-2 to monitor the pressure difference at both ends of the bypass branch 2-2.

[0059] As a preferred embodiment, Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7As shown, the double-barrel filter 4-1 is arranged between the second oil guide pipe 4-3 and the third oil guide pipe 4-4, and includes two filter cartridges 4-1-1 and a switching valve housing 4-1-5; wherein: the filter cartridge 4-1-1 is connected to one end of the switching valve housing 4-1-5 through a connecting pipe, a filter element 4-1-2 is installed in the filter cartridge 4-1-1, and a bleed screw plug 4-1-7 is installed on the filter cartridge cover 4-1-3 at the upper end of the filter cartridge 4-1-1, and an oil drain screw plug 4-1-8 is installed at the lower end of the filter cartridge 4-1-1; the switching valve housing 4-1-5 is installed between two symmetrically arranged filter cartridges 4-1-1, and a switching valve core 4-1-6 is arranged in the switching valve housing 4-1-5, and a guide hole is arranged on the switching valve core 4-1-6 for use with the connecting pipe, the second oil guide pipe 4-3 and the third oil guide pipe 4-4 respectively.

[0060] It should be noted that, in this embodiment, through the arrangement of the above-mentioned filter cartridge 4-1-1, filter element 4-1-2, filter cartridge cover 4-1-3, switching valve cover 4-1-4, switching valve shell 4-1-5 and switching valve core 4-1-6, when in use, it can not only connect the second oil guide pipe 4-3 and the third oil guide pipe 4-4 to filter the particulate impurities exceeding the operating standard in the oil; at the same time, when the two filter cartridges 4-1-1 are in use, one can be used as a backup (the two filter cartridges 4-1-1 can also work at the same time), which is convenient for online replacement of the filter element 4-1-2 during use.

[0061] In this embodiment, a pressure differential transmitter is also provided in the filter cartridge 4-1-1. When the pressure differential between the inside and outside of the filter element 4-1-2 exceeds 0.15MPa, a switch alarm signal is issued. At the same time, a red button on the transmitter pops up to remind you to replace the filter element 4-1-2 in time. Before replacing the filter element 4-1-2, the switching valve core 4-1-6 connecting the filter cartridges 4-1-1 on both sides needs to be opened. When the pressure on both sides of the filter cartridge 4-1-1 is balanced (loosen the upper cover plate venting bolt 4-1-7, and the oil overflows), turn the switching handle to the other side (note that it is rotated in place), and close the switching valve core 4-1-6 at the same time. At this time, the upper cover of the filter cartridge whose filter element 4-1-2 needs to be replaced can be opened; the filter element 4-1-2 can be lifted out for replacement; and then the upper cover is reset.

[0062] As a preferred embodiment, Figure 6 As shown, an oil pressure detection branch is also provided at the oil inlet and the oil outlet of the duplex filter 4-1, and the oil pressure detection branch is connected to the second oil guide pipe 4-3 and the third oil guide pipe 4-4 respectively, and a second control valve 14, a second pressure gauge 15 and a third control valve 16 are provided on the oil pressure detection branch, and the second control valve 14 and the second pressure gauge 15 are respectively provided at both ends of the oil pressure detection branch.

[0063] It should be noted that, in the present embodiment, the opening and closing of the oil pressure detection branch is controlled by the second control valve 14 and the second pressure gauge 15, and the oil pressure in the oil pressure detection branch is detected by the second pressure gauge 15 as required.

[0064] As a preferred embodiment, Figure 6 As shown, an oil circuit protection branch is also provided at the oil inlet and the oil outlet of the duplex filter 4 - 1 , and a pressure difference switch 7 is provided on the oil circuit protection branch.

[0065] It should be noted that, in this embodiment, the differential pressure switch 7 uses the differential pressure of the oil circuit protection branch pipes on both sides to send out an electrical signal. When the differential pressure at both ends of the series oil circuit protection branch increases (or decreases) and exceeds the set value of the differential pressure switch 7 controller, a signal is sent to control the reversing valve or monitor the lubrication system. The valve is then opened (or closed), so that the differential pressure at both ends of the system liquid pipe is reduced, and the normal operation of the system is achieved.

[0066] The necessary parameters and operating principles of the new type of coal mill oil lubrication station include:

[0067] 1. The viscosity of the lubricating oil suitable for this coal mill thin oil lubrication station is 22-320cst (at 40℃), equivalent to N22-N320.

[0068] 2. The main technical parameters of this coal mill oil lubrication station are:

[0069] (1) BDBH-350 thin oil lubricating oil station system set pressure: 1MPa;

[0070] (2) Nominal flow rate of BDBH-350 thin oil lubrication station system: 350L / min;

[0071] (3) Working medium: N320 sulfur-phosphorus heavy extreme pressure industrial gear oil;

[0072] (4) Oil supply temperature: 50°C;

[0073] (5) Duplex filter filtration accuracy: 25μm

[0074] (6) Cooler water inlet temperature: ≤40℃

[0075] (7) Maximum water inlet pressure of cooler: 1.2MPa

[0076] (8) Cooling water flow: 21m 3 / h

[0077] (9) Low-pressure pump motor: 7 / 11KW / 380VAC / 50HZ / 720 / 1450r / min.

[0078] 3. The maintenance process of this coal mill oil lubrication station is as follows:

[0079] (1) When using the duplex filter 4-1 for the first time, you need to turn the switch valve handle to one side before starting the pump (note: it needs to be rotated 90 degrees. Due to position restrictions, the handle needs to be withdrawn once and then turned to the right position after changing the angle). The filter cartridge 4-1-1 pointed by the tail of the handle is the working filter cartridge; at the same time, confirm that the filter's switch valve core 4-1-6 is in the closed position (the switch valve core 4-1-6 is a ball valve structure, and the ball valve handle is perpendicular to the pipeline direction of the switch valve core 4-1-6 for the closed position, and parallel to it for the disconnected position);

[0080] (2) Start the pump. After the oil enters the filter cartridge 4-1-1, loosen the upper cover plate bleed bolt 4-1-7 of the upper cover 4-1-3 of the working filter cartridge to release air. When loosening, remember not to unscrew it completely (to avoid a large amount of oil leakage); when a small amount of oil overflows from the cover plate bleed bolt 4-1-7, tighten the cover plate bleed bolt 4-1-7. Note that when the double-tube filter 4-1 needs to switch to the other side filter cartridge 4-1-1 for operation, when the switching valve core 4-1-6 is opened to implement the switch, the filter cartridge to be put into operation also needs to be bleed. Bleeding is a must to avoid a large amount of air in the oil and cause pipeline air shock.

[0081] (3) When the entire oil station needs to be replaced, since there is oil in the filter cartridge 4-1-1, the drain plug 4-1-8 on the outer side of the lower part of the filter cartridge 4-1-2 (each filter cartridge 4-1-1 has an oil drain plug 4-1-8 on the outer side of the lower part) needs to be unscrewed to drain all the oil.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A coal mill oil lubrication station, characterized in that: include: Lubricating oil flow guide system (2); And, arranged on the pipeline of the lubricating oil diversion system (2): A motor pump group (3) is arranged at the lubricating oil inlet end of the lubricating oil diversion system (2); A filtering system (4) is arranged on a pipeline of the lubricating oil guiding system (2) between the motor pump unit (3) and the cooling system (1), and comprises a filter (4-1); The cooling system (1) is arranged at the lubricating oil outlet end of the lubricating oil guiding system (2), and comprises a cooler (1-1).

2. A coal mill thin oil lubrication station as claimed in claim 1, characterized in that: The lubricating oil guiding system (2) comprises: The liquid inlet oil pipe (2-1) has open ends at both ends, and oil inlets (2-3) are provided at the ends of the liquid inlet oil pipe (2-1); A first oil guide pipe (4-2), one end of which is connected to the liquid oil inlet pipe (2-1), and the other end of which is connected to the motor pump group (3); A second oil guide pipe (4-3), one end of which is connected to the oil inlet passage of the filter (4-1), and the other end of which is connected to the motor pump unit (3); A third oil guide pipe (4-4), one end of which is connected to the duplex filter (4-1), and the other end of which is connected to the cooler (1-1); The drain oil pipe (4-5) is connected to the cooler (1-1), and oil outlets (2-4) are provided at both ends of the drain oil pipe (4-5).

3. A coal mill thin oil lubrication station as claimed in claim 2, characterized in that: The first oil guide pipe (4-2) is connected to the motor pump group (3) via a connecting branch, and a first butterfly valve (11) is provided on the connecting branch.

4. A coal mill thin oil lubrication station as claimed in claim 2, characterized in that: The second oil guide pipe (4-3) is connected to the motor pump group (3) via a connecting branch, and a check valve (3-1) and a second butterfly valve (12) are provided on the connecting branch.

5. A coal mill thin oil lubrication station as claimed in claim 2, characterized in that: The second oil guide pipe (4-3) and the liquid discharge oil pipe (4-5) are both provided with a first pressure detection gauge (5) and a bimetallic thermometer (6).

6. A coal mill thin oil lubrication station as claimed in claim 2, characterized in that: A pressure switch (10) is provided on one end of the oil discharge pipe (4-5) close to the oil outlet (2-4).

7. A coal mill thin oil lubrication station as claimed in claim 2, characterized in that: A bypass branch (2-2) is provided between the liquid oil inlet pipe (2-1) and the third oil guide pipe (4-4), and a flow valve (8) and a differential pressure gauge (9) are provided on the bypass branch (2-2).

8. A coal mill thin oil lubrication station as claimed in claim 2, characterized in that: The filter (4-1) is a double-tube filter arranged between the second oil guide pipe (4-3) and the third oil guide pipe (4-4), comprising: The filter cartridge (4-1-1) is connected to one end of the switching valve housing (4-1-5) through a connecting pipe; A filter element (4-1-2) is arranged in the filter cartridge (4-1-1); The switching valve housing (4-1-5) is arranged between two symmetrically arranged filter cartridges (4-1-1), and a switching valve core (4-1-6) is arranged in the switching valve housing (4-1-5). The switching valve core (4-1-6) is provided with flow guide holes respectively matching the connecting pipe, the second oil guide pipe (4-3) and the third oil guide pipe (4-4).

9. A coal mill thin oil lubrication station as claimed in claim 8, characterized in that: An air release screw plug (4-1-7) is arranged on the filter cartridge cover (4-1-3) at the upper end of the filter cartridge (4-1-1), and an oil release screw plug (4-1-8) is arranged at the lower end of the filter cartridge (4-1-1).

10. A coal mill thin oil lubrication station as claimed in claim 8, characterized in that: An oil pressure detection branch is provided at the oil inlet and the oil outlet of the filter (4-1), the two ends of the oil pressure detection branch are respectively connected to the second oil guide pipe (4-3) and the third oil guide pipe (4-4), and a second control valve (14), a second pressure gauge (15) and a third control valve (16) are provided on the oil pressure detection branch, and the second pressure gauge (15) is provided between the second control valve (14) and the third control valve (16).

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