Embedded scraper type coal feeder

Abstract

The embodiment of the invention provides an embedded scraper type coal feeder which comprises a machine shell, a scraper blade and a coal feeder body, and the machine shell is provided with a coal inlet and a coal outlet; a blanking port of the hopper is communicated with a coal inlet of the machine shell; the weighing type belt coal conveying device is arranged in the machine shell and corresponds to the position of the coal inlet; and the scraper type conveying coal feeding device is arranged corresponding to the coal outlet of the machine shell and is used for conveying the coal guided out from the coal outlet to a coal mill. According to the weighing type belt coal conveying device, the machine shell is arranged, so that the weighing type belt coal conveying device arranged in the machine shell can be effectively prevented from being influenced by the high temperature outside the machine shell, accurate measurement of the coal feeding amount can be achieved, and the situation that a weighing functional part of the weighing type belt coal conveying device catches fire can be avoided.

Description

Technical Field

[0001] Embodiments of the present disclosure belong to the technical field of coal feeding equipment, and particularly relate to an enclosed drag conveyor feeder. Background Art

[0002] The operation of a fan mill requires a supporting enclosed drag conveyor feeder. The enclosed drag conveyor feeder is the main coal feeding equipment in the coal pulverizing system. It has the characteristic of uniform coal feeding and can continuously feed coal (infinitely adjustable according to the operating conditions) into the fan mill. The enclosed drag conveyor feeder can meet the coal feeding requirements for a relatively long distance, and its sealed box structure is suitable for operation under positive and negative pressure conditions.

[0003] However, when the enclosed drag conveyor feeder is supporting a fan mill, since the air source of the fan mill generally comes from the furnace flue in the boiler, and then with the supporting hot secondary air and cold furnace flue, the internal environment temperature of the mill reaches above 500 °C, and the ambient temperature at the lower part of the feeder can reach up to 800 °C at most. If the coal pulverizing system has positive and negative pressure, it will cause high temperature inside the feeder, thus seriously affecting the operation of the weighing module inside the enclosed drag conveyor feeder, resulting in a large error in the metering of the feeder, and seriously affecting the calculation of the power supply coal consumption and the inventory check in the factory.

[0004] Therefore, how to solve the above problems has become an urgent technical problem for those skilled in the art. Summary of the Invention

[0005] Embodiments of the present disclosure aim to at least solve one of the technical problems existing in the prior art, and provide an enclosed drag conveyor feeder.

[0006] One aspect of the embodiments of the present disclosure provides an enclosed drag conveyor feeder, including: a housing having a coal inlet and a coal outlet;

[0007] a hopper, the discharging port of the hopper is communicated with the coal inlet of the housing;

[0008] a weighing belt coal feeding device disposed inside the housing and corresponding to the position of the coal inlet;

[0009] a scraper conveyor coal feeding device corresponding to the coal outlet of the housing, for conveying the coal discharged from the coal outlet to the mill.

[0010] Further, the feeder further includes: an upper feeding pipe, the inlet end of the upper feeding pipe is communicated with the discharging port of the hopper, and the outlet end of the upper feeding pipe is communicated with the coal inlet of the housing.

[0011] Further, the feeder further includes: an upper plug plate of the feeder, the upper plug plate of the feeder is inserted into the upper feeding pipe for adjusting the feeding flow rate of the upper feeding pipe.

[0012] Further, the coal feeder further includes a downward coal pipe, an inlet end of the downward coal pipe is communicated with a coal outlet of the housing, an outlet end of the downward coal pipe corresponds to the position of the scraper conveyor coal feeding device, and the downward coal pipe conducts coal to the scraper conveyor coal feeding device through its outlet end.

[0013] Further, the coal feeder further includes a lower plug plate of the coal feeder, and the lower plug plate of the coal feeder is inserted into the downward coal pipe for adjusting the coal falling flow rate of the downward coal pipe.

[0014] Optionally, the weighing belt coal feeding device includes a weighing driving wheel and a weighing driven wheel that are relatively spaced apart in the housing, a weighing belt wound around the weighing driving wheel and the weighing driven wheel, and a pressure sensor disposed in the housing and abutting against the weighing belt for measuring the mass carried by the weighing belt.

[0015] Further, the coal feeder further includes a chain cleaning device, the chain cleaning device is disposed in the housing and is relatively spaced apart from the weighing belt coal feeding device, and the chain cleaning device is used for cleaning the coal falling on the bottom wall of the housing.

[0016] Optionally, the chain cleaning device includes a chain driving wheel and a chain driven wheel that are relatively spaced apart in the housing, a chain wound around the chain driving wheel and the chain driven wheel, and a chain scraper disposed on the chain and in contact with the bottom wall of the housing.

[0017] Optionally, the scraper conveyor coal feeding device includes a housing supporting the housing, a coal feeding driving wheel and a coal feeding driven wheel that are relatively spaced apart in the housing, a scraper conveyor belt wound around the coal feeding driving wheel and the coal feeding driven wheel, and a scraper disposed on the scraper conveyor belt; the housing has a coal falling port communicated with the coal outlet of the housing and a coal conveying port.

[0018] Further, the coal feeder further includes a coal conveying pipe and a coal feeding plug plate, an inlet end of the coal conveying pipe is communicated with the coal conveying port of the housing, an outlet end of the coal conveying pipe is communicated with a coal mill; the coal feeding plug plate is inserted into the coal conveying pipe for adjusting the coal conveying flow rate of the coal conveying pipe.

[0019] The beneficial effects of the embodiments of the present disclosure include:

[0020] In the present invention, by providing a housing, the weighing belt coal feeding device disposed in the housing can be effectively protected, preventing the weighing belt coal feeding device from being affected by the high temperature outside the housing, so that both the accurate measurement of the coal feeding amount can be realized and the weighing functional components of the weighing belt coal feeding device can be prevented from catching fire. Description of the Drawings

[0021] Figure 1 This is a schematic structural diagram of a buried scraper coal feeder according to an embodiment of the present disclosure.

[0022] 1. Housing; 2. Weighing belt coal feeding device; 3. Chain cleaning device; 4. Scraper conveyor coal feeding device; 5. Hopper; 6. Upper and lower feeding pipes; 7. Lower feeding pipe; 8. Upper coal feeder plug; 9. Lower coal feeder plug; 10. Coal conveying pipe; 11. Coal feeding plug;

[0023] 12. Support member; 21. Weighing driving wheel; 22. Weighing driven wheel; 23. Weighing belt;

[0024] 24. Pressure sensor; 31. Chain driving wheel; 32. Chain driven wheel; 33. Chain;

[0025] 34. Chain scraper; 41. Housing; 42. Coal feeding driving wheel; 43. Coal feeding driven wheel;

[0026] 44. Scraper conveyor belt. Detailed implementation manners

[0027] To enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0028] The following further describes in detail the implementation manners of the present application in conjunction with the accompanying drawings and embodiments. The detailed descriptions and drawings of the following embodiments are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments. In the description of the present application, it should be noted that unless otherwise specified, the meaning of "a plurality" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate the orientation or positional relationship only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0029] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0030] As Figure 1 shown, a scraper coal feeder includes a housing 1, a hopper 5, a weighing belt coal feeding device 2, and a scraper conveyor coal feeding device 4. The housing 1 has a coal inlet and a coal outlet. The feeding port of the hopper 5 is communicated with the coal inlet of the housing 1. The weighing belt coal feeding device 2 is arranged in the housing 1 and corresponds to the position of the coal inlet. The scraper conveyor coal feeding device 4 is arranged corresponding to the coal outlet of the housing 1 and is used to convey the coal discharged from the coal outlet to the coal mill.

[0031] In the present invention, by providing the housing 1, the weighing belt coal feeding device 2 arranged in the housing 1 can be effectively protected, preventing the weighing belt coal feeding device 2 from being affected by the high temperature outside the housing 1. It can not only achieve accurate measurement of the coal feeding amount, but also avoid the weighing function parts of the weighing belt coal feeding device 2 catching fire.

[0032] In some embodiments, the coal feeder further includes an upper feeding pipe 6. The inlet end of the upper feeding pipe 6 is communicated with the feeding port of the hopper 5, and the outlet end of the upper feeding pipe 6 is communicated with the coal inlet of the housing 1.

[0033] In some embodiments, the coal feeder further includes an upper coal feeder plug plate 8. The upper coal feeder plug plate 8 is inserted into the upper feeding pipe 6 and is used to adjust the feeding flow rate of the upper feeding pipe 6.

[0034] In some embodiments, the coal feeder further includes a lower feeding pipe 7. The inlet end of the lower feeding pipe 7 is communicated with the coal outlet of the housing 1, and the outlet end of the lower feeding pipe 7 corresponds to the position of the scraper conveyor coal feeding device 4. The lower feeding pipe 7 conducts the coal to the scraper conveyor coal feeding device 4 through its outlet end.

[0035] In some embodiments, the coal feeder further includes a lower coal feeder plug plate 9. The lower coal feeder plug plate 9 is inserted into the lower feeding pipe 7 and is used to adjust the feeding flow rate of the lower feeding pipe 7.

[0036] In some embodiments, the weighing belt coal feeding device 2 includes a weighing driving wheel 21 and a weighing driven wheel 22 that are relatively spaced apart in the housing 1, a weighing belt 23 wound around the weighing driving wheel 21 and the weighing driven wheel 22, and a pressure sensor 24 arranged in the housing 1 and abutting against the weighing belt 23 for measuring the mass carried by the weighing belt 23.

[0037] In some embodiments, the coal feeder further includes a chain cleaning device 3. The chain cleaning device 3 is arranged in the housing 1 and is relatively spaced apart from the weighing belt coal feeding device 2. The chain cleaning device 3 is used to clean the coal falling on the bottom wall of the housing 1.

[0038] In some embodiments, the chain cleaning device 3 is relatively and spacedly arranged between a chain driving wheel 31 and a chain driven wheel 32 disposed in the casing 1, a chain 33 wound around the chain driving wheel 31 and the chain driven wheel 32, and a chain scraper 34 disposed on the chain 33 and in contact with the bottom wall of the casing 1.

[0039] In some embodiments, the scraper type coal feeding device 4 includes a casing 41 supporting the casing 1, a coal feeding driving wheel 42 and a coal feeding driven wheel 43 relatively and spacedly arranged in the casing 41, a scraper conveyor belt 44 wound around the coal feeding driving wheel 42 and the coal feeding driven wheel 43, and a scraper disposed on the scraper conveyor belt 44. The casing 41 has a coal dropping port communicating with the coal outlet of the casing 1 and a coal conveying port.

[0040] In some embodiments, the coal feeder further includes a coal conveying pipe 10 and a coal feeding plug plate 11. The inlet end of the coal conveying pipe 10 communicates with the coal conveying port of the casing 41, the outlet end of the coal conveying pipe 10 communicates with the coal mill, and the coal feeding plug plate 11 is inserted into the coal conveying pipe 10 for adjusting the coal conveying flow rate of the coal conveying pipe 10.

[0041] Specifically, the weighing belt coal feeding device 2 and the scraper type coal feeding device 4 are vertically and relatively spacedly distributed in the casing 1. The diameter of the hopper 5 is 800 - 1000 mm, and the coal feeder is further provided with a weighing idler in contact with the weighing belt 23. The chain cleaning device 3 is provided with a chain scraper 34 in contact with the bottom wall of the casing 1 to clean the pulverized coal on the bottom wall of the casing 1.

[0042] Both sides of the casing 1 are open, and the openings are connected to the outlet pipelines of the cold secondary air or micro - oil distribution blower as the sealing air of the coal feeder.

[0043] The motors of the chain driving wheel 31 and the weighing driving wheel 21 are both variable - frequency motors, and the motor frequency of the coal feeding driving wheel 42 is the same as that of the motors of the chain driving wheel 31 and the weighing driving wheel 21. The coal feeder further includes a coal flow indicator and a control box, and the pressure sensor 24, the coal flow indicator and the control box are all electrically connected to the motor.

[0044] The raw coal in the hopper 5 falls onto the upper part of the weighing belt 23 (rubber belt) through the upper coal feeding plug plate 8 on the upper coal feeding pipe 6. During the movement of the weighing belt 23, the coal feeding amount is measured in real time through the signal of the pressure sensor 24 and the rotation speed signal of the weighing belt 23, and the raw coal directly enters the casing 41 through the lower coal feeding plug plate 9 on the lower coal feeding pipe 7 and is conveyed into the internal of the fan coal mill by the motor of the coal feeding driving wheel 42 at the same frequency to complete the whole process.

[0045] The control logic of the coal feeder includes:

[0046] Startup permission:

[0047] The coal mill and the drag scraper type coal feeder are operating;

[0048] The ignition energy of this corner meets the requirement;

[0049] The lower slide plate of the coal feeder is opened;

[0050] The outlet temperature of the coal mill is appropriate;

[0051] There is no tripping condition.

[0052] Trip due to protection:

[0053] The coal mill trips;

[0054] The lower slide plate of the coal feeder is closed;

[0055] The boiler MFT occurs;

[0056] Trip due to abnormality;

[0057] Manual shutdown;

[0058] The drag scraper coal feeder stops;

[0059] Signals of coal interruption and chain breakage of the drag scraper coal feeder come.

[0060] The control logic of the lower slide plate of the coal feeder includes:

[0061] Automatic opening:

[0062] When the operation signal of the drag scraper coal feeder comes, the lower slide plate of the coal feeder automatically opens.

[0063] Automatic closing:

[0064] When the chain breakage signal of the drag scraper coal feeder comes, the lower slide plate of the coal feeder automatically closes.

[0065] When the coal interruption signal of the drag scraper coal feeder or the weighing belt coal feeding device comes, the lower slide plate of the coal feeder automatically closes.

[0066] When the overtemperature signal of the drag scraper coal feeder comes, the lower slide plate of the coal feeder automatically closes.

[0067] When the shutdown signal of the drag scraper coal feeder comes, the lower slide plate of the coal feeder automatically closes.

[0068] When the abnormal tripping signal of the coal mill comes, the lower slide plate of the coal feeder automatically closes.

[0069] When the boiler MFT signal comes, the lower slide plate of the coal feeder automatically closes.

[0070] Other control logics also include:

[0071] The judgment condition of the coal flame detector is changed to that the coal quantity signal of the weighing coal feeder comes and a delay time is added, so as to start judging the flame detector. The micro-oil flame detector needs to take the micro-oil mode signal and has no association with the coal feeder.

[0072] It is understandable that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present disclosure. However, the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present disclosure, and these modifications and improvements are also regarded as the protection scope of the present disclosure.

Claims

1. A buried scraper coal feeder, characterized in that, include: A casing, wherein the casing has a coal inlet and a coal outlet; A hopper, wherein a material discharge port of the hopper is connected to a coal inlet of the casing; A weighing type belt coal conveying device, wherein the weighing type belt coal conveying device is arranged in the casing and corresponds to the position of the coal inlet; A scraper-type coal conveying and feeding device is arranged corresponding to the coal outlet of the casing, and is used for conveying the coal discharged from the coal outlet to the coal mill.

2. The drag scraper coal feeder according to claim 1, characterized in that The coal feeder further comprises an upper drop pipe, wherein an inlet end of the upper drop pipe is communicated with a drop opening of the hopper, and an outlet end of the upper drop pipe is communicated with a coal inlet of the casing.

3. The drag scraper coal feeder according to claim 2, wherein, The coal feeder further comprises: an upper plug plate of the coal feeder, wherein the upper plug plate of the coal feeder is plugged into the upper drop pipe and is used for adjusting the drop flow rate of the upper drop pipe.

4. The drag scraper coal feeder according to claim 1, wherein, The coal feeder also includes: a lower drop pipe, the inlet end of the lower drop pipe is connected to the coal outlet of the casing, the outlet end of the lower drop pipe corresponds to the position of the scraper-type coal conveying feeding device, and the lower drop pipe conducts the coal to the scraper-type coal conveying feeding device through its outlet end.

5. The drag scraper coal feeder according to claim 4, wherein, The coal feeder further comprises: a coal feeder lower plug plate, which is inserted into the lower drop pipe and is used to adjust the drop flow rate of the lower drop pipe.

6. The drag feeder according to claim 1, wherein The weighing-type belt coal conveying device includes a weighing drive wheel and a weighing driven wheel which are relatively spaced apart and arranged in the casing, a weighing belt wound around the weighing drive wheel and the weighing driven wheel, and a pressure sensor which is arranged in the casing and abuts against the weighing belt and is used to measure the load-bearing mass of the weighing belt.

7. The drag scraper coal feeder according to claim 1, characterized in that The coal feeder further comprises: a chain cleaning device, which is arranged in the casing and spaced apart from the weighing-type belt coal conveying device, and is used for cleaning the fallen coal on the bottom wall of the casing.

8. The drag scraper coal feeder according to claim 7, wherein The chain cleaning device comprises a chain driving wheel and a chain driven wheel which are relatively spaced apart and arranged in the housing, a chain wound around the chain driving wheel and the chain driven wheel, and a chain scraper which is arranged on the chain and contacts the bottom wall of the housing.

9. The drag scraper coal feeder according to claim 1, wherein, The scraper-type coal conveying device includes a shell supporting the casing, a coal feeding drive wheel and a coal feeding driven wheel arranged relatively and spaced apart in the shell, a scraper conveyor belt wound around the coal feeding drive wheel and the coal feeding driven wheel, and a scraper arranged on the scraper conveyor belt; the shell has a coal drop port connected to the coal outlet of the casing, and a coal delivery port.

10. The drag scraper coal feeder according to claim 9, characterized in that, The coal feeder also includes: a coal conveying pipe and a coal feeding plug plate, the inlet end of the coal conveying pipe is connected to the coal conveying port of the shell, and the outlet end of the coal conveying pipe is connected to the coal mill; the coal feeding plug plate is inserted in the coal conveying pipe to adjust the coal conveying flow rate of the coal conveying pipe.

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