Filter screen anti-blocking back flushing device of large gear oil injection device of coal mill

Abstract

The utility model discloses a coal mill bull gear oil injection device filter screen anti-blocking blowback device which comprises an air inlet pipe, one end of the air inlet pipe is connected with an air source of an oil injection device, and the other end of the air inlet pipe is communicated with an air inlet of the oil injection device and a part, located at the downstream of a filter screen in the flowing direction of oil, in an oil suction pipe. When the oil injection device stops using, the filter screen is reversely blown to be smooth, and safe operation of the coal mill can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of oil injection devices, and more specifically, to a filter screen anti-blocking and back-blowing device for a large gear oil injection device of a coal mill. Background Art

[0002] Coal mill is the core equipment of thermal power plant, and steel ball mill is one of them. The operating environment of steel ball mill is bad. In order to ensure the normal operation and maintenance of coal mill, the coal mill of the unit is usually used in rotation under low load. Due to the vibration, dust and coal powder leakage generated during the operation of coal mill, the oil barrel of the oil injection device often enters the coal powder. During the use and shutdown of coal mill, the mixture of lubricating grease and coal powder in the oil barrel stays at the filter screen of the oil suction pipe for a long time, cools and solidifies. Over time, the filter screen of the oil injection device is blocked by the mixture, and the oil injection device cannot extract the lubricating grease in the oil barrel, causing the entire lubrication system to fail to operate, affecting the normal operation of the coal mill. Utility Model Content

[0003] The utility model aims to provide a filter screen anti-blocking back-blowing device for a large gear oil injection device of a coal mill, which back-blows the filter screen when the oil injection device stops being used to make it unobstructed, thereby ensuring the safe operation of the coal mill.

[0004] In order to achieve these purposes and other advantages of the utility model, a filter screen anti-blocking back-blowing device for a large gear oil injection device of a coal mill is provided, wherein the filter screen is arranged in an oil suction pipe of the oil injection device, and the oil suction pipe is inserted into an oil barrel, comprising:

[0005] The air inlet pipe has one end connected to the air source of the oil injection device, and the other end connected to the air inlet of the oil injection device and the part of the oil suction pipe located downstream of the filter screen along the oil flow direction.

[0006] Preferably, in the filter anti-blocking back-blowing device of the large gear oil injection device of the coal mill, the air inlet pipe is provided with a pressure switch, a pressure reducing valve and an electromagnetic three-way valve in sequence from one end to the other end, the inlet of the electromagnetic three-way valve is connected to the air source of the oil injection device, and the two outlets are respectively connected to the air inlet of the oil suction pipe and the part of the oil suction pipe located downstream of the filter along the flow direction of the oil.

[0007] Preferably, the filter screen anti-blocking back-blowing device of the coal mill gear oil injection device further comprises:

[0008] An oil groove into which flows industrial gear oil which absorbs the temperature of the bearing bush;

[0009] A heating pipe has one end connected to the oil tank and the other end connected to the coal mill lubricating oil station. A portion of the heating pipe is wound around the oil suction pipe and is close to the filter.

[0010] Preferably, in the filter screen anti-blocking back-blowing device of the coal mill large gear oil injection device, the portion of the heating pipe wound around the oil suction pipe is located downstream of the filter screen.

[0011] The utility model at least has the following beneficial effects:

[0012] The utility model adds an air pipe capable of bearing 0.4-0.8M at the electromagnetic reversing valve on the air source control panel of the fuel injection device. After the air pipe is connected to the oil suction pipe of the fuel injection device, after the normal fuel injection gas is finished, the electromagnetic reversing valve is connected to the back-blowing air pipe to blow off the oil-coal mixture on the filter screen to prevent the filter screen from being blocked, thus ensuring the normal operation of the fuel injection device.

[0013] The utility model transfers the heat of the return oil to the filter screen and the oil barrel at the bottom of the oil injection device to prevent the sludge from condensing and clogging at the filter screen, and heats the lubricating grease of the oil injection device, and finally returns to the oil station. This method of heating the lubricating grease and filter screen of the oil injection device has a moderate temperature, does not require extra equipment for heating, and will not cause fire when used in places with a lot of coal powder. The return oil pressure is low, which will not bring danger to maintenance.

[0014] The utility model is safe, reliable and durable, and ensures that the oil injection device can normally provide continuous lubrication for the large gear of the coal mill in a harsh environment, thereby improving the safety and economy of the coal mill.

[0015] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a schematic structural diagram of a filter screen anti-blocking back-blowing device of a large gear oil injection device of a coal mill according to an embodiment of the utility model. DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0018] It should be noted that, in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] like Figure 1As shown, the utility model provides a filter screen anti-blocking back-blowing device for a large gear oil injection device of a coal mill. The filter screen is arranged in an oil suction pipe of the oil injection device, and the oil suction pipe is inserted into an oil barrel. The filter screen anti-blocking back-blowing device comprises:

[0020] Intake pipe 1, one end of which (such as Figure 1 The left end as shown is connected to the air source of the oil injection device 2, and the other end is connected to the air inlet 201 of the oil injection device 2 and the part of the oil suction pipe 202 located downstream of the filter screen along the oil flow direction.

[0021] When the oil spray device 2 is in use, the air source of the oil spray device 2 supplies air to the oil spray device 2. When the oil spray device 2 stops being used, its filter screen is back-blown to make it unobstructed.

[0022] Because the end of the oil suction pipe 202 (such as Figure 1 The bottom end shown in the figure is inserted into the oil drum, and the oil-coal mixture blown off from the filter screen enters the oil drum.

[0023] In another embodiment, in the filter screen anti-blocking back-blowing device of the large gear oil injection device 2 of the coal mill, the air intake pipe 1 is provided with a pressure switch 3 (to adjust the pressure of the gas), a pressure reducing valve 4 (to reduce the pressure of the gas) and an electromagnetic three-way valve 5 in sequence from one end to the other end. The inlet of the electromagnetic three-way valve 5 is connected to the gas source of the oil injection device 2, and the two outlets are respectively connected to the air inlet 201 of the oil suction pipe 202 and the part of the oil suction pipe 202 located downstream of the filter screen along the flow direction of the oil.

[0024] One outlet of the electromagnetic three-way valve 5 is communicated with a portion of the oil suction pipe 202 located downstream of the filter screen through the back-blowing air pipe 6 .

[0025] A back-blowing air pipe 6 capable of bearing 0.4-0.8M is installed at the electromagnetic reversing valve on the air source control panel of the fuel injection device 2. After the back-blowing air pipe 6 is connected to the oil suction pipe 202 of the fuel injection device 2, after the normal fuel injection gas is used, the electromagnetic three-way valve 5 is connected to the back-blowing air pipe 6 to blow off the oil-coal mixture on the filter screen to prevent the filter screen from being blocked, thereby ensuring the normal operation of the fuel injection device 2.

[0026] In another embodiment, the filter screen anti-blocking back-blowing device of the coal mill gear oil injection device 2 further includes:

[0027] An oil groove into which flows industrial gear oil which absorbs the temperature of the bearing bush;

[0028] The heating pipe 7 has one end connected to the oil tank and the other end connected to the coal mill lubricating oil station. A portion of the heating pipe 7 (such as the middle portion of the heating pipe 7) is wound around the oil suction pipe 202 and is close to the filter.

[0029] The coal mill lubricating oil station (hereinafter referred to as the oil station) delivers industrial gear oil to the coal mill bearings through high and low pressure oil pumps, provides bearing lubrication and high pressure jacking bearings (provides bearing clearance), provides complete lubrication and pressure, and absorbs the industrial gear oil at the bearing temperature (normal temperature 40°C) and falls into the return oil tank. A part of the industrial gear oil in the oil tank is directly returned to the oil station through the return oil pipe for circulation, and the other part of the industrial gear oil passes through the bottom of the suction pipe 202 through the heating pipe 7, and transfers the heat of the return oil to the filter at the bottom of the suction pipe 202 to prevent the sludge from condensing and clogging at the filter, and heats the lubricating grease of the oil injection device 2, and finally returns to the oil station. This method of heating the lubricating grease and filter of the oil injection device 2 has a moderate temperature, does not require extra equipment for heating, and will not cause fire when used in places with a lot of coal powder, and the return oil pressure is low, which will not bring danger to maintenance.

[0030] In another embodiment, in the filter screen anti-blocking back-blowing device of the coal mill gear oil injection device 2, the portion of the heating pipe 7 wound on the oil suction pipe 202 is located downstream of the filter screen. The portion of the oil suction pipe 202 located upstream of the filter screen is inserted into the oil drum, so the heating pipe 7 is wound on the portion of the oil suction pipe 202 located downstream of the filter screen.

[0031] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A filter screen anti-blocking back-blowing device for a large gear oil injection device of a coal mill. The filter screen is arranged in the oil suction pipe of the oil injection device, and the oil suction pipe is inserted into the oil barrel. The device is characterized in that: include: The air inlet pipe has one end connected to the air source of the fuel injection device, and the other end communicates with the air inlet of the fuel injection device and a portion of the oil suction pipe located downstream of the filter screen along the oil flow direction.

2. The filter screen anti-blocking and back-blowing device for the large gear oil injection device of the coal mill according to claim 1, characterized in that: The air intake pipe is provided with a pressure switch, a pressure reducing valve and an electromagnetic three-way valve in sequence from one end to the other end. The inlet of the electromagnetic three-way valve is connected to the air source of the oil injection device, and the two outlets are respectively connected to the air inlet of the oil suction pipe and the part of the oil suction pipe located downstream of the filter along the oil flow direction.

3. The filter screen anti-blocking and back-blowing device for the large gear oil injection device of the coal mill according to claim 1, characterized in that: Also includes: An oil groove into which flows industrial gear oil which absorbs the temperature of the bearing bush; A heating pipe has one end connected to the oil tank and the other end connected to the coal mill lubricating oil station. A portion of the heating pipe is wound around the oil suction pipe and is close to the filter.

4. The filter screen anti-blocking and back-blowing device for the large gear oil injection device of the coal mill according to claim 3, characterized in that: The portion of the heating tube that wraps around the oil suction pipe is located downstream of the filter.

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