A fuel pulverizing device for a thermal power plant coal yard

Abstract

The present invention discloses a fuel pulverizing device, and specifically relates to a fuel pulverizing device for a thermal power coal yard, comprising a pulverizing device shell, the bottom end of the pulverizing device shell is fixedly connected to the pulverizing device base, a fan duct connected to a booster fan is provided on one side of the pulverizing device base, a feed port connected to a vibrating feeder is provided on one side of the pulverizing device shell, and the top end of the pulverizing device shell is fixedly connected to a pulverizing device top cover. In this scheme, a multi-axis grinding effect is achieved by a pulverizing mechanism correspondingly arranged inside the pulverizing device shell, thereby increasing the grinding efficiency of the device, and the reverse rotation of the lifting device is utilized to reduce the coal powder cyclone phenomenon inside the pulverizing device shell to a certain extent, and at the same time, the feeding process of the lifting device is utilized to enable fine particles to be ground in a targeted manner, thereby reducing the use pressure of the filtering device.

Description

Technical Field

[0001] The invention belongs to the technical field of fuel pulverizing devices, and in particular relates to a fuel pulverizing device for a thermal power coal yard. Background Art

[0002] A thermal power plant is a factory that uses combustibles (such as coal) as fuel to produce electricity. Its basic working principle is: the fuel is burned to heat water to generate steam, the pressure generated by the steam drives the turbine to rotate, and then the turbine drives the generator to rotate, and finally the mechanical energy is converted into electrical energy, thereby generating electricity. At the same time, the hot water or steam generated in the boiler can also directly provide the required heat energy for industrial production and people's lives.

[0003] When the existing thermal power coal yard fuel pulverizing equipment is in use, its grinding part mostly adopts multi-head or single-head unidirectional impact grinding to make powder. This structure produces more gap particles during grinding. Although the air pressure circulation grinding method can filter and block the granular coal powder, it needs to be repeatedly reworked and ground, thereby accelerating the wear and aging of the blocking and filtering part.

[0004] At the same time, after the circulating granular coal powder is ground and crushed in the main bin, its size is critical to the threshold aperture of the filter device, so the secondary rotary grinding and pulverizing effect is also poor. For this reason, we propose a fuel pulverizing device for thermal power coal yards. Summary of the invention

[0005] The object of the present invention is to provide a fuel pulverizing device for a thermal power plant coal yard to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a fuel pulverizing device for a thermal power coal yard, comprising a pulverizing device shell, the bottom end position of the pulverizing device shell is fixedly connected to the pulverizing device base, a fan duct connected to a booster fan is provided on one side of the pulverizing device base, a feed port connected to a vibrating feeder is provided on one side of the pulverizing device shell, the top end position of the pulverizing device shell is fixedly connected to the pulverizing device top cover, and a filter device for filtering coal powder is installed at the middle position of the bottom end of the pulverizing device top cover, and the pulverizing device A discharge pipe is provided at the top end of the top cover, and a powder making mechanism is fixedly installed inside the shell of the powder making device, and the powder making mechanism includes a powder making grinding table fixedly installed at the bottom of the shell of the powder making device, and a driving motor fixedly installed inside the base of the powder making device, wherein the top output shaft of the driving motor is fixedly connected to the powder making main shaft, a grinding cutter head is installed at the middle position of the outer side of the powder making main shaft, and a plurality of powder making sub-shafts are synchronously driven at the top end of the powder making main shaft through a linkage device, and a lifting grinding head is fixedly installed at the bottom end of the powder making sub-shaft.

[0007] A powder making cavity used in conjunction with a grinding head is provided at the inner center of the powder making and grinding table, and a fine crushing cavity used in conjunction with a lifting grinding head is provided in a ring shape with the powder making cavity as the center at the outer edge of the powder making and grinding table;

[0008] A lifting device for feeding is installed on the inner side of the base of the powder making device at a position corresponding to the bottom of the fine crushing cavity (49).

[0009] Furthermore, the linkage device includes a bevel gear platform 1 fixedly mounted on the outside of the milling main shaft, and a bevel gear platform 2 correspondingly mounted on the outside of the milling sub-shaft, wherein a support structure is mounted on the outside of the top end of the milling main shaft, and a double-headed bevel gear transmission rod meshing with the bevel gear platform 1 and the bevel gear platform 2 is rotatably mounted inside the support structure.

[0010] Furthermore, the support structure includes a powder running support rotatably mounted on the outside of the powder making main shaft through a bearing swivel seat, and a support top cover correspondingly sleeved at the top position of the powder running support, wherein the powder running support and the double-headed bevel gear transmission rod are rotatably connected through a rotating shaft.

[0011] Furthermore, grinding teeth which are used in an interlaced manner with the grinding cutter head are integrally mounted on the inner wall of the powder making chamber.

[0012] Furthermore, the lifting device includes a lifting hopper installed at the bottom of the fine crushing cavity, and a loading turntable installed at the top of the base of the powder making device, wherein the interior of the loading turntable is provided with a lifting ring groove for accommodating the lifting hopper, and the interior of the base of the powder making device is fixedly provided with a transmission device for driving the loading turntable to rotate.

[0013] Furthermore, the transmission device includes a transmission motor correspondingly installed on the outside of the base of the powder making device, wherein the transmission shaft of the transmission motor passes through the side wall of the base of the powder making device and is fixedly connected to the transmission gear, and an annular tooth meshing with the transmission gear is installed at the bottom position of the loading turntable, wherein the loading turntable is rotatably installed at the inner top position of the base of the powder making device through a bearing structure to grind the teeth.

[0014] Furthermore, the bearing structure includes an embedded retainer fixedly mounted on the top inner wall of the base of the powder making device, and the top and bottom positions of the embedded retainer are annularly filled with multiple roller steel balls.

[0015] Furthermore, a positioning hole for inserting the bottom of the milling shaft is provided at the middle of each of the fine crushing cavities, and a lifting and loading hole is provided at the bottom of the fine crushing cavity corresponding to the highest point of the lifting hopper.

[0016] Furthermore, a hole for the powder-making main shaft to pass through is opened at the inner center position of the powder-making cavity, and a plurality of air holes are opened at the bottom position of the powder-making cavity.

[0017] Furthermore, a wall-adhering roller is fixedly mounted on the top end of the milling sub-shaft, and the two are fixed by welding.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In this scheme, the multi-axis grinding effect is achieved by correspondingly setting the powder making mechanism inside the shell of the powder making device, thereby increasing the grinding efficiency of the device, and utilizing the reverse rotation of the lifting device to reduce the cyclone phenomenon of coal powder inside the shell of the powder making device to a certain extent. At the same time, utilizing the feeding treatment of the lifting device, fine particles are ground in a targeted manner, thereby reducing the use pressure of the filtering device.

[0020] 2. The bearing structure corresponding to the base of the milling device ensures the smooth rotation of the lifting device. At the same time, the coordinated use of the feeding turntable and the lifting hopper reduces the situation of particle retention and increases the feeding efficiency.

[0021] 3. The wall-attached rollers correspondingly arranged at the top of the pulverizing shaft can assist in grinding the pulverized coal particles falling along the inner wall of the pulverizing device shell, thereby preventing large pulverized coal particles from falling onto the feeding turntable and blocking its rotation. This part can also directly prevent large combustible blocks from falling directly into the fine crushing chamber during the vibration feeding process of the device, thereby reducing the grinding and pulverizing pressure of the fine crushing chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 For the present invention Figure 1 Exploded diagram of

[0025] Figure 3 For the present invention Figure 2 Schematic diagram of the structure rotated ninety degrees counterclockwise;

[0026] Figure 4 It is a schematic diagram of the structure of the powder making mechanism of the present invention;

[0027] Figure 5 It is a schematic diagram of the combined structure of the milling shaft and the linkage device of the present invention;

[0028] Figure 6 For the present invention Figure 5 Exploded diagram of

[0029] Figure 7 It is an exploded view of the powder making and grinding table and the material lifting device of the present invention;

[0030] Figure 8 This is a schematic diagram of the structure of the powder making and grinding table of the present invention;

[0031] Fig. 9 It is a schematic diagram of the structure of the feeding turntable of the present invention;

[0032] In the figure: 1. pulverizing device housing; 11. feed inlet; 12. pulverizing grinding table; 2. pulverizing device top cover; 21. filter device; 22. discharge pipe; 3. pulverizing device base; 31. fan pipe; 4. drive motor; 41. pulverizing main shaft; 42. grinding cutter head; 43. bearing swivel seat; 44. pulverizing sub-shaft; 45. lifting grinding head; 451. wall-attached roller; 46. pulverizing bracket; 47. bracket top cover; 48. pulverizing chamber; 481. grinding teeth; 49. fine crushing chamber; 51. double-headed helical gear transmission rod; 52. helical gear table one; 53. helical gear table two; 6. transmission motor; 61. feeding turntable; 62. lifting hopper; 63. lifting ring groove; 71. transmission gear; 72. annular teeth; 73. embedded retaining frame; 74. roller steel ball. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as a limitation on the present invention.

[0035] Reference Figure 1-Figure 9The present invention proposes a technical solution: a fuel pulverizing device for a thermal power plant coal yard, comprising a pulverizing device housing 1, the bottom end of the pulverizing device housing 1 is fixedly connected to a pulverizing device base 3, a fan duct 31 connected to a booster fan is provided on one side of the pulverizing device base 3, a feed port 11 connected to a vibrating feeder is provided on one side of the pulverizing device housing 1, the top end of the pulverizing device housing 1 is fixedly connected to a pulverizing device top cover 2, and a filter device 21 for filtering coal powder is installed at the middle position of the bottom end of the pulverizing device top cover 2, and a filter device 21 for filtering coal powder is installed at the top end of the pulverizing device top cover 2. A discharge pipe 22 is provided through the powder making device. A powder making mechanism is fixedly installed inside the powder making device housing 1. The powder making mechanism includes a powder making grinding table 12 fixedly installed at the bottom of the powder making device housing 1, and a driving motor 4 fixedly installed inside the base 3 of the powder making device. The top output shaft of the driving motor 4 is fixedly connected to a powder making main shaft 41. A grinding cutter head 42 is installed at the middle position of the outer side of the powder making main shaft 41. A plurality of powder making sub-shafts 44 are synchronously driven at the top position of the powder making main shaft 41 through a linkage device, and a lifting grinding head 45 is fixedly installed at the bottom position of the powder making sub-shaft 44.

[0036] A powder making cavity 48 for use with the grinding head 42 is provided at the inner center of the powder making and grinding table 12, and a fine crushing cavity 49 for use with the lifting grinding head 45 is provided in a ring shape with the powder making cavity 48 as the center at the outer edge of the powder making and grinding table 12; a lifting device for feeding is installed on the inner side of the powder making device base 3 at a position directly below the fine crushing cavity 49, wherein the bottom of the powder making device base 3 is a double-layer structure, the drive motor 4 is placed at the bottom position of the powder making device base 3, and a ventilation duct is provided in the middle layer of the powder making device base 3, and the fan duct 31 is arranged in this part, and the ventilation duct is a hyperbolic tower-shaped structure, and above it is the position where the embedded retaining frame 73 is provided.

[0037] In this embodiment, further, the linkage device includes a bevel gear platform 1 52 fixedly mounted on the outside of the milling main shaft 41, and a bevel gear platform 2 53 correspondingly mounted on the outside of the milling sub-shaft 44, wherein a bracket structure is mounted on the outside of the top end of the milling main shaft 41, and a double-headed bevel gear transmission rod 51 meshing with the bevel gear platform 1 52 and the bevel gear platform 2 53 is rotatably mounted inside the bracket structure, and the bracket structure includes a powder running bracket 46 rotatably mounted on the outside of the milling main shaft 41 through a bearing swivel 43, and a bracket top cover 47 correspondingly sleeved at the top position of the powder running bracket 46, wherein the powder running bracket 46 and the double-headed bevel gear transmission rod 51 are rotatably connected through a rotating shaft, and the inner wall of the powder making chamber 48 is integrally installed with grinding teeth 481 which are used in an interlaced manner with the grinding cutter head 42. Through the corresponding wall-adhering roller 451 arranged on the top of the powder making sub-axis 44, the coal powder particles falling along the inner wall of the powder making device shell 1 are auxiliary ground to avoid large particles of coal powder falling onto the feeding turntable 61 and blocking the rotation. This part can also directly avoid the situation where large pieces of combustible block structures fall directly into the fine crushing chamber 49 during the vibration feeding process of the device, thereby reducing the grinding and powder making pressure of the fine crushing chamber 49.

[0038] In the present embodiment, further, the lifting device includes a lifting hopper 62 correspondingly installed at the bottom position of the fine crushing cavity 49, and a loading turntable 61 correspondingly rotatably installed at the top position of the powder making device base 3, wherein the interior of the loading turntable 61 is cooperated with to open a lifting ring groove 63 for accommodating the lifting hopper 62, and the interior of the powder making device base 3 is fixedly installed with a transmission device for driving the loading turntable 61 to rotate, and the transmission device includes a transmission motor 6 correspondingly installed on the outside of the powder making device base 3, wherein the transmission shaft of the transmission motor 6 passes through the side wall of the powder making device base 3 and is fixedly connected to the transmission gear 71, and the bottom position of the loading turntable 61 is cooperated with to install a transmission motor 6 corresponding to the feeding turntable 61. The transmission gear 71 has mutually meshing annular teeth 72, wherein the loading turntable 61 is rotatably installed at the inner top position of the base 3 of the powder making device through a bearing structure, wherein the interior of the lifting ring groove 63 is in a fit with the lifting hopper 62, and when the transmission device drives the loading turntable 61 to rotate, the granular coal powder inside the lifting ring groove 63 will move up along the lifting hopper 62 to the interior of the fine crushing cavity 49, and then use the coordinated grinding of the powder making sub-axis 44, so that the particles blocked by the filtering device 21 from falling off the wall will be correspondingly ground for the second time, and this part is used for fine crushing, and the threshold output particle size can be smaller than the grinding particle size of the middle main shaft, thereby reducing the number of rework grinding times.

[0039] In order to cooperate with the booster fan connected to the fan duct 31, an air hole for the booster wind to pass through is opened at the bottom position of the lifting ring groove 63, and when the wind passes through the air hole, it will have the effect of lifting and moving the granular coal powder inside the turntable, making it easier for the granular coal powder to pass through the hole on the top of the lifting hopper 62 and enter the interior of the fine crushing cavity 49. Then, by utilizing the reverse grinding of the pulverizing shaft 44 and the fine crushing cavity 49, the prepared pulverized coal is put into the mainstream wind on the pulverizing cavity 48 for wind pressure circulation.

[0040] In this embodiment, further, the bearing structure includes an embedded retainer 73 fixedly mounted on the top inner wall of the powder making device base 3, and the top and bottom positions of the embedded retainer 73 are annularly filled with multiple roller steel balls 74, and a positioning hole for inserting the bottom of the powder making shaft 44 is opened at the middle position of each fine crushing cavity 49, and a lifting and feeding hole is opened at the bottom of the fine crushing cavity 49 corresponding to the highest point of the lifting hopper 62. The bearing structure corresponding to the arrangement on the powder making device base 3 is used to ensure the smoothness of the rotation of the lifting device. At the same time, the coordinated use of the feeding turntable 61 and the lifting hopper 62 reduces the situation of particle retention and increases the feeding efficiency. The air hole opened on the powder making cavity 48 only allows coal powder that reaches the combustion standard volume to pass through, and the bottom of the powder making grinding table 12 is a truncated cone structure. When the ground coal powder structure passes through the air hole, under the action of the booster fan, the coal powder will pass through this part and return to the internal wind pressure of the powder making device housing 1.

[0041] In this embodiment, further, a hole for the powder making main shaft 41 to pass through is opened at the inner center position of the powder making chamber 48, and a plurality of air holes are opened at the bottom position of the powder making chamber 48, and a wall-attached roller 451 is fixedly installed at the top end of the powder making sub-shaft 44.

[0042] Working principle and use process of the present invention: When this type of coal-fired power plant fuel pulverizing device is in use, the vibrating feeder connected to the feed port 11 feeds the screened coal blocks into the interior of the pulverizing device housing 1, and some powdered coal particles pass through the booster fan connected to the fan duct 31, directly through the filter device 21 into the interior of the discharge duct 22, and the coal powder is supplied accordingly.

[0043] Some larger coal blocks will fall into the interior of the powder making chamber 48, and through the cooperation of the grinding head 42 and the grinding teeth 481, a grinding volume capable of taking off and feeding will be reached, and then transmitted to the position of the filter device 21 along the mainstream air duct. The unblocked coal powder will be directly supplied for combustion through the discharge pipe 22, and the blocked crushed materials will fall to the top position of the loading turntable 61 along the wall-adhering down ramp of the powder making device shell 1. Due to the wall-adhering falling method in the prior art, the crushed materials will first pass through the coarse crushing and stirring part formed by the wall-adhering roller 451 and the side wall of the powder making device shell 1, which has the effect of one coarse crushing and grinding. Then the crushed materials will fall directly to the position of the loading turntable 61, and at this time, they will move to the inside of the lifting ring groove 63 through the gap between the loading turntable 61 and the powder making grinding table 12.

[0044] Then, the power supply of the transmission motor 6 is turned on. Driven by the transmission motor 6, the transmission gear 71 drives the loading turntable 61 to rotate along the embedded retaining frame 73 in the opposite direction of the driving motor 4, so that the granular crushed materials inside the lifting ring groove 63 move up along the slope structure of the lifting hopper 62 to the interior of the fine crushing cavity 49. At the same time, when this part is in use, it utilizes the air holes at the bottom of the lifting ring groove 63. Driven by the booster fan, it can play an auxiliary role in lifting the granular crushed materials, so that the crushed materials gather at the lifting loading port of the fine crushing cavity 49, thereby increasing the functionality and feeding efficiency of the device.

[0045] It is worth noting that the powder making main shaft 41 and the powder making branch shaft 44 achieve the grinding processing effect of linked rotation through the cooperation of the double-headed bevel gear transmission rod 51 with the bevel gear table 1 52 and the bevel gear table 2 53, and the wall-sticking falling method mentioned in the above steps, that is, a material running ramp is opened on the inner wall of the powder making device shell 1 in a spiral shape, to ensure that the particulate fragments blocked by the filter device 21 can fall along the inner wall of the powder making device shell 1.

[0046] According to the above working process, it can be known that: in this scheme, the multi-axis grinding effect is achieved by the corresponding powder making mechanism arranged inside the powder making device shell 1, the grinding efficiency of the device is increased, and the reverse rotation of the lifting device is utilized to reduce the coal powder cyclone phenomenon inside the powder making device shell 1 to a certain extent. At the same time, the feeding treatment of the lifting device is utilized to enable fine particles to be ground in a targeted manner, thereby reducing the use pressure of the filtering device 21.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fuel pulverizing device for a thermal power plant coal yard, comprising a pulverizing device housing (1), wherein the bottom end of the pulverizing device housing (1) is fixedly connected to a pulverizing device base (3), a fan duct (31) connected to a booster fan is provided on one side of the pulverizing device base (3), a feed port (11) connected to a vibrating feeder is provided on one side of the pulverizing device housing (1), the top end of the pulverizing device housing (1) is fixedly connected to a pulverizing device top cover (2), and a filter device (21) for filtering coal powder is installed at the middle position of the bottom end of the pulverizing device top cover (2), and a discharge pipe (22) is provided through the top end of the pulverizing device top cover (2), characterized in that: A powder making mechanism is fixedly installed inside the powder making device housing (1), and the powder making mechanism comprises a powder making grinding table (12) fixedly installed at the bottom of the powder making device housing (1), and a drive motor (4) fixedly installed inside the powder making device base (3), wherein the top output shaft of the drive motor (4) is fixedly connected to a powder making main shaft (41), and a grinding cutter head (42) is installed at the middle position of the outer side of the powder making main shaft (41). A first bevel gear platform (52) is fixed on the outside of the milling main shaft (41), and a second bevel gear platform (53) is fixed on the outside of the milling branch shaft (44), wherein a support structure is installed on the outside of the top end of the milling main shaft (41), and a double-headed bevel gear transmission rod (51) meshing with the first bevel gear platform (52) and the second bevel gear platform (53) is rotatably installed inside the support structure, The support structure comprises a powder running support (46) rotatably mounted on the outside of a powder making main shaft (41) via a bearing rotating seat (43), and a support top cover (47) correspondingly sleeved at the top position of the powder running support (46), wherein the powder running support (46) and a double-headed helical gear transmission rod (51) are rotatably connected via a rotating shaft. A lifting grinding head (45) is fixedly installed at the bottom end of the milling shaft (44). A powder making cavity (48) for use with the grinding head (42) is provided at the inner center of the powder making and grinding table (12), and a fine crushing cavity (49) for use with the lifting grinding head (45) is provided in an annular shape with the powder making cavity (48) as the center at the outer edge of the powder making and grinding table (12); A lifting device for feeding is installed on the inner side of the powder making device base (3) at a position corresponding to the bottom of the fine crushing cavity (49).

2. A fuel pulverizing device for a thermal power plant coal field according to claim 1, characterized in that: The inner wall of the powder making cavity (48) is integrally mounted with grinding teeth (481) that are used in an interlaced manner with the grinding blade head (42).

3. A fuel pulverizing device for a thermal power plant coal field according to claim 1, characterized in that: The lifting device comprises a material lifting hopper (62) correspondingly installed at the bottom position of the fine crushing chamber (49), and a material loading turntable (61) correspondingly rotatably installed at the top position of the base (3) of the powder making device, wherein the interior of the material loading turntable (61) is provided with a material lifting ring groove (63) for accommodating the material lifting hopper (62), and the interior of the base (3) of the powder making device is fixedly provided with a transmission device for driving the material loading turntable (61) to rotate.

4. A fuel pulverizing device for a thermal power plant coal field according to claim 3, characterized in that: The transmission device comprises a transmission motor (6) correspondingly mounted on the outer side of the powder making device base (3), wherein the transmission shaft of the transmission motor (6) passes through the side wall of the powder making device base (3) and is fixedly connected to the transmission gear (71), and an annular tooth (72) meshing with the transmission gear (71) is mounted at the bottom of the loading turntable (61), wherein the loading turntable (61) is rotatably mounted at the inner top position of the powder making device base (3) through a bearing structure.

5. A fuel pulverizing device for a thermal power plant coal field according to claim 4, characterized in that: The bearing structure comprises an embedded retainer (73) fixedly mounted on the top inner wall of the powder making device base (3), and a plurality of roller steel balls (74) are annularly filled at the top and bottom positions of the embedded retainer (73).

6. A fuel pulverizing device for a thermal power plant coal field according to claim 3, characterized in that: A positioning hole for inserting the bottom of the milling shaft (44) is provided at the middle of each of the fine crushing cavities (49), and a lifting and loading hole is provided at the bottom of the fine crushing cavity (49) corresponding to the highest point of the lifting hopper (62).

7. The fuel pulverizing device for a thermal power plant coal field according to claim 1, characterized in that: A hole for the powder making main shaft (41) to pass through is provided at the inner center of the powder making cavity (48), and a plurality of air holes are provided at the bottom of the powder making cavity (48).

8. The fuel pulverizing device for a thermal power plant coal field according to claim 1, characterized in that: A wall-adhering roller (451) is fixedly mounted on the top end of the flour-making sub-shaft (44).

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