Device for drying raw coal at inlet of coal mill

Abstract

The invention belongs to the technical field of pulverized coal processing, and discloses a device for drying raw coal at an inlet of a coal mill, which comprises a medium-speed coal mill, a coal mill feed port is arranged at the top end of the medium-speed coal mill, a drying box is mounted at the top end of the coal mill feed port, a drying feed port is arranged at the top end of the drying box, and a first motor is mounted at the top end of the drying box. A beating transmission mechanism is arranged at the bottom end of the first motor, and after wet coal briquettes are put into the drying box through the drying feeding opening, the coal briquettes make contact with beating transmission paddles; only the coal briquettes which are completely dried and scattered can fall into the bottom through the shaking plate and enter the interior of the medium-speed coal mill through the coal mill feeding port to be subjected to follow-up treatment, and the blowing shaking force can be controlled by setting the contact time of a position sensor and the coal briquettes, so that the device is more intelligent; in this way, the purpose that the coal briquettes can be driven to shake while the coal briquettes are scattered through the first motor of the device is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of coal powder processing, in particular to a device for drying raw coal at an inlet of a coal mill. Background Art

[0002] Coal is ground into powder and burned in the furnace of the boiler of a thermal power plant. The water in the boiler absorbs heat and becomes steam with certain parameters to drive the turbine to rotate. The turbine drives the generator to generate electricity. At present, the coal used in power plants needs to be ground into powder. A medium-speed coal mill is needed for grinding. When the coal powder enters the medium-speed coal mill, it enters the medium-speed coal mill through the coal inlet pipe. At this time, it is necessary to break up and dry the wet coal before it enters the coal inlet pipe to avoid clogging the coal inlet pipe with damp wet coal.

[0003] However, during the rainy season or cloudy or rainy periods, the coal will become damp, causing the coal inlet pipe to be blocked, making it unusable. Although the drying device has a certain adaptability to a variety of raw coals, when processing certain special types of coal, coal blocks that are too large or too small may not be able to fully contact the hot air, resulting in uneven drying, which may not be effective or require additional treatment measures.

[0004] It is necessary to ensure the uniformity of drying when drying the coal blocks entering the device, so as to efficiently evaporate the moisture in the raw coal and achieve rapid drying. In addition, since a large amount of energy is consumed during the drying process, it is necessary to utilize the excess energy resources used during the operation of the device to achieve an environmental protection effect. Summary of the invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides a device for drying raw coal at the inlet of a coal mill.

[0006] To achieve the above object, the present invention provides the following technical solution: a device for drying raw coal at the inlet of a coal mill, comprising a medium-speed coal mill, a coal mill feed port is arranged at the top of the medium-speed coal mill, a drying box is installed at the top of the coal mill feed port, a drying feed port is opened at the top of the drying box, a first motor is installed at the top of the drying box, and a scattering transmission mechanism is arranged at the bottom of the first motor; The dispersing transmission mechanism includes a transmission rod, a dispersing transmission paddle and fan blades, the transmission rod is installed at the bottom end of the first motor, the outer wall of the transmission rod is fixed with a dispersing transmission paddle, the bottom end of the transmission rod is installed with fan blades, the inner wall of the drying box is fixed with a mounting rod, the side wall of the mounting rod is fixed with an air collecting bin, the inner wall of the air collecting bin is provided with an air outlet, the output end of the air outlet is connected with an air supply pipe, the outer wall of the air supply pipe is installed with a first solenoid valve, the bottom end of the first solenoid valve is provided with a multi-angle jet mechanism, the outer wall of the air supply pipe is provided with a second solenoid valve, the top of the second solenoid valve is provided with a lifting air hole, and the top of the dispersing transmission paddle is fixed with a position sensor.

[0007] Preferably, the spreading transmission paddles are provided with several groups fixed on the outer wall of the transmission rod, and the spreading transmission paddles are distributed at equal intervals about the central axis of the transmission rod. The fan blades are provided with several groups fixed on the outer wall of the transmission rod, and the fan blades are distributed at equal intervals about the central axis of the transmission rod.

[0008] Preferably, the mounting rods are provided with four groups fixed on the inner wall of the drying box, the mounting rods are distributed at equal intervals about the central axis of the drying box, a hole is opened at the top of the air collecting bin, and the transmission rod and the air collecting bin are movably connected.

[0009] Preferably, the inner wall of the air collecting bin is provided with four groups of air outlets, and the air outlets are evenly spaced about the central axis of the air collecting bin. Two groups of position sensors are provided and fixed on the top of the dispersion transmission propeller, and the position sensors are symmetrically distributed about the central axis of the dispersion transmission propeller.

[0010] Preferably, the multi-angle jet mechanism includes a first conveying head, a second motor and a first gear, the first conveying head is installed at the bottom end of the first solenoid valve, the outer wall of the first conveying head is fixed with a second motor, the bottom end of the second motor is provided with a first gear, the bottom end of the first conveying head is movably connected with the second conveying head, the outer wall of the second conveying head is fixed with a third motor, the bottom end of the third motor is provided with a second gear, the bottom end of the second conveying head is movably connected with the third conveying head, the outer wall of the third conveying head is fixed with a fourth motor, the bottom end of the fourth motor is installed with a third gear, and the bottom end of the third conveying head is movably connected with a cleaning nozzle.

[0011] Preferably, the outer wall of the second motor is provided with a plurality of groups of teeth with equal spacing, the outer wall of the second conveying head is provided with a plurality of groups of teeth with equal spacing, and the second motor and the second conveying head are meshingly connected.

[0012] Preferably, the outer wall of the second gear is provided with a plurality of groups of teeth with equal spacing, the outer wall of the third delivery head is provided with a plurality of groups of teeth with equal spacing, and the second gear and the third delivery head are meshingly connected.

[0013] Preferably, the outer wall of the third gear is provided with a plurality of groups of teeth with equal spacing, the outer wall of the cleaning nozzle is provided with a plurality of groups of teeth with equal spacing, and the third gear and the cleaning nozzle are meshingly connected.

[0014] Preferably, a shaking plate is installed on the inner wall of the drying box, a slide groove is opened on the inner wall of the drying box, the outer wall of the shaking plate is close to the slide groove opened in the drying box, the shaking plate and the drying box are slidably connected, a plurality of groups of filter holes are opened on the top of the shaking plate, and a plurality of groups of heating wires are installed on the inner wall of the drying box.

[0015] Preferably, a control panel is fixed to the outer wall of the drying box, a display screen is fixed to the outer wall of the control panel, and a plurality of groups of control buttons are arranged on the outer wall of the control panel.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention cooperates with structures such as a transmission rod, a scattering transmission paddle, and fan blades so that after the wet coal blocks are placed in the drying box through the drying feed port, the coal blocks contact the scattering transmission paddle, and the shape of the scattering transmission paddle drives the scattering transmission paddle and the transmission rod to rotate, so that the weight generated by the falling coal blocks is recovered to a certain extent. After starting the first motor, the transmission rod and the scattering transmission paddle can be driven to rotate, so that the fan blades rotate inside the gas collecting bin, thereby driving the gas flow, so that the airflow passes through the gas transmission pipe, the first solenoid valve, the second solenoid valve and the lifting air hole to blow to the bottom end of the shaking plate. Since the shaking plate and the inner wall of the drying box are slidably connected, the shaking plate can move upward, and after reaching the top of the slide slot, it contacts the sensor at the top of the slide slot, and automatically controls the second solenoid valve to close. Closed, causing the shaking plate and the coal blocks remaining on the top of the shaking plate to fall downward. In this process, the coal blocks can be shaken off, so that the coal blocks constantly contact the scattering transmission paddle and are broken up by the scattering transmission paddle. Since the heating wire is always in the started state, the inside of the drying box can be heated, and the heating and drying effect can be better after breaking up. Only the coal blocks that have been completely dried and broken up can pass through the shaking plate and fall to the bottom and enter the medium-speed coal mill through the coal mill feed port for subsequent processing. The strength of the blowing and shaking can also be controlled by setting the contact time between the position sensor and the coal block, making the device more intelligent, so as to achieve the purpose of facilitating the device to use the first motor to break up the coal blocks and drive the coal blocks to shake at the same time.

[0017] The present invention arranges the coordination of the first conveying head, the second motor, the first gear and other structures so that the device can discharge the gas through the first conveying head, the second conveying head, the third conveying head and the cleaning nozzle after opening the first solenoid valve and closing the second solenoid valve, so that the gas blows the coal blocks retained at the bottom of the drying box, so that they fall into the interior of the medium-speed coal mill at the bottom through the coal mill feed port for processing. The first solenoid valve and the second solenoid valve can be manually controlled by the control button and automatically controlled by the position sensor, so as to achieve the purpose of facilitating the device to dry and break up the coal blocks and then collect and feed them. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the drying box structure of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the drying box of the present invention; Figure 4 It is a schematic diagram of the structure of the breaking up transmission mechanism of the present invention; Figure 5 It is a schematic cross-sectional structure diagram of the breaking up transmission mechanism of the present invention; Figure 6 It is a schematic diagram of the structure of the multi-angle jet mechanism of the present invention; Figure 7 It is a schematic diagram of the structure of the multi-angle jet mechanism of the present invention in a rotating state.

[0019] In the figure: 1. medium-speed coal mill; 2. coal mill feed port; 3. drying box; 4. drying feed port; 5. first motor; 6. scattering transmission mechanism; 601. transmission rod; 602. scattering transmission paddle; 603. fan blade; 604. mounting rod; 605. gas collection bin; 606. gas outlet; 607. gas pipeline; 608. first solenoid valve; 609. second solenoid valve; 610. lifting air hole; 611. position sensor; 7. multi-angle jet mechanism; 701. first conveying head; 702. second motor; 703. first gear; 704. second conveying head; 705. third motor; 706. second gear; 707. third conveying head; 708. fourth motor; 709. third gear; 710. cleaning nozzle; 8. shaking plate; 9. heating wire; 10. control panel; 11. display screen; 12. control button. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] like Figures 1 to 7 As shown, the present invention provides a device for drying raw coal at the inlet of a coal mill, comprising a medium-speed coal mill 1, a coal mill feed port 2 is arranged at the top of the medium-speed coal mill 1, a drying box 3 is installed at the top of the coal mill feed port 2, a drying feed port 4 is opened at the top of the drying box 3, a first motor 5 is installed at the top of the drying box 3, a breaking up transmission mechanism 6 is arranged at the bottom end of the first motor 5, a shaking plate 8 is installed on the inner wall of the drying box 3, a slide groove is opened on the inner wall of the drying box 3, the outer wall of the shaking plate 8 is close to the slide groove opened in the drying box 3, the shaking plate 8 and the drying box 3 are slidably connected, a plurality of groups of filter holes are opened at the top of the shaking plate 8, a plurality of groups of heating wires 9 are installed on the inner wall of the drying box 3, a control panel 10 is fixed to the outer wall of the drying box 3, a display screen 11 is fixed to the outer wall of the control panel 10, and a plurality of groups of control buttons 12 are arranged on the outer wall of the control panel 10.

[0022] The above solution is adopted: by starting the heating wire 9, the heating wire 9 can heat the inside of the device, thereby drying the coal blocks inside the device.

[0023] like Figures 1 to 7 As shown, the scattering transmission mechanism 6 includes a transmission rod 601, a scattering transmission paddle 602 and a fan blade 603. The transmission rod 601 is installed at the bottom end of the first motor 5. The scattering transmission paddle 602 is fixed on the outer wall of the transmission rod 601. The fan blade 603 is installed on the bottom end of the transmission rod 601. The scattering transmission paddle 602 is provided with several groups fixed on the outer wall of the transmission rod 601, and the scattering transmission paddle 602 is evenly distributed about the central axis of the transmission rod 601. The fan blade 603 is provided with several groups fixed on the outer wall of the transmission rod 601, and the fan blade 603 is evenly distributed about the central axis of the transmission rod 601.

[0024] like Figures 1 to 7 As shown, a mounting rod 604 is fixed to the inner wall of the drying box 3, and an air collecting bin 605 is fixed to the side wall of the mounting rod 604. Four groups of mounting rods 604 are fixed to the inner wall of the drying box 3. The mounting rods 604 are evenly spaced about the central axis of the drying box 3. A hole is provided at the top of the air collecting bin 605, and the transmission rod 601 and the air collecting bin 605 are movably connected.

[0025] like Figures 1 to 7As shown, an air outlet 606 is provided on the inner wall of the air collecting bin 605, and the output end of the air outlet 606 is connected to an air supply pipe 607. A first solenoid valve 608 is installed on the outer wall of the air supply pipe 607, and a multi-angle jet mechanism 7 is provided at the bottom end of the first solenoid valve 608. A second solenoid valve 609 is provided on the outer wall of the air supply pipe 607, and a lifting air hole 610 is installed on the top of the second solenoid valve 609. A position sensor 611 is fixed to the top of the dispersion transmission paddle 602. Four groups of air outlets 606 are provided on the inner wall of the air collecting bin 605, and the air outlets 606 are evenly spaced about the central axis of the air collecting bin 605. Two groups of position sensors 611 are provided and fixed on the top of the dispersion transmission paddle 602, and the position sensors 611 are symmetrically distributed about the central axis of the dispersion transmission paddle 602.

[0026] The above scheme is adopted: after the wet coal blocks are placed into the drying box 3 through the drying feed port 4, the coal blocks contact the scattering transmission paddle 602, and the shape of the scattering transmission paddle 602 drives the scattering transmission paddle 602 and the transmission rod 601 to rotate, so that the weight generated by the falling coal blocks is recovered to a certain extent. After starting the first motor 5, the transmission rod 601 and the scattering transmission paddle 602 can be driven to rotate, so that the fan blades 603 rotate inside the gas collecting bin 605, thereby driving the gas flow, so that the air flow passes through the gas supply pipe 607, the first solenoid valve 608, the second solenoid valve 609 and the lifting air hole 610 to blow to the bottom end of the shaking plate 8. Since the shaking plate 8 and the inner wall of the drying box 3 are in sliding connection, the shaking plate 8 can move upward, and after reaching the top of the slide groove, it contacts the sliding groove. The sensor at the top of the trough automatically controls the second solenoid valve 609 to close, causing the shaking plate 8 and the coal blocks remaining on the top of the shaking plate 8 to fall downward. In this process, the coal blocks can be shaken off, so that the coal blocks constantly contact the scattering transmission paddle 602 and are broken up by the scattering transmission paddle 602. Since the heating wire 9 is always in the started state, the inside of the drying box 3 can be heated, and the heating and drying effect can be better after breaking up. Only the coal blocks that have been completely dried and broken up can pass through the shaking plate 8 and fall to the bottom and enter the medium-speed coal mill 1 through the coal mill feed port 2 for subsequent processing. The strength of the blowing and shaking can also be controlled by setting the contact time between the position sensor 611 and the coal block, making the device more intelligent.

[0027] like Figures 1 to 7As shown, the multi-angle jet mechanism 7 includes a first delivery head 701, a second motor 702 and a first gear 703. The first delivery head 701 is installed at the bottom end of the first solenoid valve 608. The second motor 702 is fixed to the outer wall of the first delivery head 701. The bottom end of the second motor 702 is provided with a first gear 703. The bottom end of the first delivery head 701 is movably connected with the second delivery head 704. The outer wall of the second motor 702 is provided with a plurality of groups of equally spaced teeth. The outer wall of the second delivery head 704 is provided with a plurality of groups of equally spaced teeth. The second motor 702 and the second delivery head 704 are meshingly connected.

[0028] like Figures 1 to 7 As shown, a third motor 705 is fixed to the outer wall of the second delivery head 704, a second gear 706 is provided at the bottom end of the third motor 705, a third delivery head 707 is movably connected to the bottom end of the second delivery head 704, a plurality of groups of equally spaced teeth are provided on the outer wall of the second gear 706, a plurality of groups of equally spaced teeth are provided on the outer wall of the third delivery head 707, and the second gear 706 and the third delivery head 707 are meshingly connected.

[0029] like Figures 1 to 7 As shown, a fourth motor 708 is fixed to the outer wall of the third delivery head 707, a third gear 709 is installed at the bottom end of the fourth motor 708, a cleaning nozzle 710 is movably connected to the bottom end of the third delivery head 707, a plurality of groups of equally spaced teeth are arranged on the outer wall of the third gear 709, a plurality of groups of equally spaced teeth are arranged on the outer wall of the cleaning nozzle 710, and the third gear 709 and the cleaning nozzle 710 are meshingly connected.

[0030] The above scheme is adopted: by opening the first solenoid valve 608 and closing the second solenoid valve 609, the gas is discharged through the first conveying head 701, the second conveying head 704, the third conveying head 707 and the cleaning nozzle 710, so that the gas blows the coal blocks retained at the bottom of the drying box 3, so that the coal blocks fall into the inside of the medium-speed coal mill 1 at the bottom through the coal mill feed port 2 for processing. The first solenoid valve 608 and the second solenoid valve 609 can be manually controlled by the control button 12 and automatically controlled by the position sensor 611. By starting the second motor 702, the second motor 7 02 can drive the first gear 703 to rotate, and then drive the second delivery head 704 to rotate, start the third motor 705, the third motor 705 can drive the second gear 706 to rotate, and then drive the third delivery head 707 to rotate, start the fourth motor 708, the fourth motor 708 can drive the third gear 709 to rotate, and then drive the cleaning nozzle 710 to rotate. Since the second delivery head 704 and the third delivery head 707 are of special shapes, the direction of the airflow can be changed during rotation, so as to achieve the effect of blowing the inside of the drying box 3 in all directions.

[0031] The working principle and use process of the present invention are as follows: by starting the heating wire 9, the heating wire 9 can heat the inside of the device, and then dry the coal blocks inside the device. After the wet coal blocks are put into the drying box 3 through the drying feed port 4, the coal blocks contact the scattering transmission paddle 602, and the shape of the scattering transmission paddle 602 drives the scattering transmission paddle 602 and the transmission rod 601 to rotate, so that the weight generated by the falling coal blocks can be recovered to a certain extent. After starting the first motor 5, the transmission rod 601 and the scattering transmission paddle 602 can be driven to rotate, so that the fan blades 603 rotate inside the gas collection bin 605, and then drive the gas flow, so that the airflow passes through the gas pipe 607, the first solenoid valve 608, the second solenoid valve 609 and the lifting air hole 610 to blow to the bottom end of the shaking plate 8. Since the shaking plate 8 and the inner wall of the drying box 3 are in sliding connection, the shaking The movable plate 8 can move upward, and after reaching the top of the slide slot, it contacts the sensor at the top of the slide slot, automatically controlling the second solenoid valve 609 to close, causing the shaking plate 8 and the coal blocks remaining on the top of the shaking plate 8 to fall downward. In this process, the coal blocks can be shaken off, causing the coal blocks to continuously contact the scattering transmission paddle 602 and be broken up by the scattering transmission paddle 602. Since the heating wire 9 is always in the started state, the inside of the drying box 3 can be heated, and after being broken up, the heating and drying effect can be better. Only the coal blocks that have been completely dried and broken up can pass through the shaking plate 8 and fall to the bottom and enter the medium-speed coal mill 1 through the coal mill feed port 2 for subsequent processing. The strength of the blowing and shaking can also be controlled by setting the contact time between the position sensor 611 and the coal block, making the device more intelligent.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for drying raw coal at the inlet of a coal mill, comprising a medium-speed coal mill (1), characterized in that: The top of the medium-speed coal mill (1) is provided with a coal mill feed port (2), the top of the coal mill feed port (2) is provided with a drying box (3), the top of the drying box (3) is provided with a drying feed port (4), the top of the drying box (3) is provided with a first motor (5), and the bottom of the first motor (5) is provided with a breaking up transmission mechanism (6); The scattering transmission mechanism (6) comprises a transmission rod (601), a scattering transmission paddle (602) and a fan blade (603); the transmission rod (601) is mounted at the bottom end of the first motor (5); the scattering transmission paddle (602) is fixed to the outer wall of the transmission rod (601); the fan blade (603) is mounted at the bottom end of the transmission rod (601); a mounting rod (604) is fixed to the inner wall of the drying box (3); a gas collecting bin (605) is fixed to the side wall of the mounting rod (604); and the inner wall of the gas collecting bin (605) is fixed to the side wall of the mounting rod (604). An air outlet (606) is provided, the output end of the air outlet (606) is connected to an air supply pipe (607), a first solenoid valve (608) is installed on the outer wall of the air supply pipe (607), a multi-angle jet mechanism (7) is provided at the bottom end of the first solenoid valve (608), a second solenoid valve (609) is provided on the outer wall of the air supply pipe (607), a lifting air hole (610) is installed at the top end of the second solenoid valve (609), and a position sensor (611) is fixed at the top end of the dispersion transmission propeller (602).

2. The device for drying raw coal at the inlet of a coal mill according to claim 1, characterized in that: The scattering transmission paddles (602) are provided with a plurality of groups fixed on the outer wall of the transmission rod (601), and the scattering transmission paddles (602) are distributed at equal intervals about the central axis of the transmission rod (601); the fan blades (603) are provided with a plurality of groups fixed on the outer wall of the transmission rod (601), and the fan blades (603) are distributed at equal intervals about the central axis of the transmission rod (601).

3. The device for drying raw coal at the inlet of a coal mill according to claim 1, characterized in that: The mounting rods (604) are provided with four groups fixed on the inner wall of the drying box (3), the mounting rods (604) are distributed at equal intervals about the central axis of the drying box (3), a hole is opened at the top of the gas collecting bin (605), and the transmission rod (601) and the gas collecting bin (605) are movably connected.

4. The device for drying raw coal at the inlet of a coal mill according to claim 1, characterized in that: The inner wall of the gas collecting bin (605) is provided with four groups of gas outlets (606), and the gas outlets (606) are distributed at equal intervals about the central axis of the gas collecting bin (605). Two groups of position sensors (611) are provided and fixed on the top of the dispersion transmission paddle (602), and the position sensors (611) are distributed symmetrically about the central axis of the dispersion transmission paddle (602).

5. The device for drying raw coal at the inlet of a coal mill according to claim 1, characterized in that: The multi-angle jet mechanism (7) comprises a first conveying head (701), a second motor (702) and a first gear (703); the first conveying head (701) is mounted at the bottom end of a first solenoid valve (608); the second motor (702) is fixed to the outer wall of the first conveying head (701); the first gear (703) is arranged at the bottom end of the second motor (702); the second conveying head (704) is movably connected to the bottom end of the first conveying head (701); the third motor (705) is fixed to the outer wall of the second conveying head (704); the second gear (706) is arranged at the bottom end of the third motor (705); the third conveying head (707) is movably connected to the bottom end of the second conveying head (704); the fourth motor (708) is fixed to the outer wall of the third conveying head (707); the third gear (709) is arranged at the bottom end of the fourth motor (708); and the cleaning nozzle (710) is movably connected to the bottom end of the third conveying head (707).

6. The device for drying raw coal at the inlet of a coal mill according to claim 5, characterized in that: The outer wall of the second motor (702) is provided with a plurality of groups of teeth with equal spacing, the outer wall of the second conveying head (704) is provided with a plurality of groups of teeth with equal spacing, and the second motor (702) and the second conveying head (704) are meshingly connected.

7. The device for drying raw coal at the inlet of a coal mill according to claim 5, characterized in that: The outer wall of the second gear (706) is provided with a plurality of groups of teeth with equal spacing, the outer wall of the third delivery head (707) is provided with a plurality of groups of teeth with equal spacing, and the second gear (706) and the third delivery head (707) are meshingly connected.

8. The device for drying raw coal at the inlet of a coal mill according to claim 5, characterized in that: The outer wall of the third gear (709) is provided with a plurality of groups of teeth with equal spacing, and the outer wall of the cleaning nozzle (710) is provided with a plurality of groups of teeth with equal spacing, and the third gear (709) and the cleaning nozzle (710) are meshingly connected.

9. The device for drying raw coal at the inlet of a coal mill according to claim 1, characterized in that: The inner wall of the drying box (3) is provided with a shaking plate (8), the inner wall of the drying box (3) is provided with a slide groove, the outer wall of the shaking plate (8) is close to the slide groove provided in the drying box (3), the shaking plate (8) and the drying box (3) are slidably connected, a plurality of groups of filter holes are provided at the top of the shaking plate (8), and a plurality of groups of heating wires (9) are provided on the inner wall of the drying box (3).

10. The device for drying raw coal at the inlet of a coal mill according to claim 1, characterized in that: A control panel (10) is fixed to the outer wall of the drying box (3), a display screen (11) is fixed to the outer wall of the control panel (10), and a plurality of groups of control buttons (12) are arranged on the outer wall of the control panel (10).

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