A circulating coal grinding device with adjustable coal powder fineness

Abstract

The present invention discloses a circulating coal grinding device with adjustable coal powder fineness, which comprises a coal grinding chamber, an impact sleeve, and an air impact separator. A discharge port is provided on both sides of the bottom of the coal grinding chamber, and a first pump is provided in the discharge port. The first pump forms a negative pressure in the discharge port and discharges the coal particles transported to the discharge port at a higher speed than the feed. The impact sleeve is formed with a plurality of impact holes. The coal particles pass through the impact holes to form a coal particle impact flow, forming a counter-impact collision in the triple chamber to obtain coal powder. In the present invention, the fineness of the final obtained coal powder can be adjusted by controlling the size of the coal particles in the coal particle impact flow, and the impact of the coal particles can disperse the coal powder in a lump, preventing the lump coal powder from accumulating and getting stuck in the air impact separator, thereby achieving the regulation of the coal powder fineness. In addition, the air impact separator allows the coal powder that does not meet the fineness standard to be blown away from the leak hole under the action of air and re-enter the coal grinding chamber for grinding, preventing the coal powder that does not meet the fineness standard from getting stuck in the machine body.

Description

Technical Field

[0001] The invention relates to the technical field of coal grinding equipment, and in particular to circulating coal grinding equipment with adjustable coal powder fineness. Background Art

[0002] For coal-fired power plant pulverizers, the fineness of coal powder varies greatly under different working conditions, which is related to parameters such as the coal feed rate of the pulverizer, the primary air volume of the pulverizer, and the pulverizer separator. When the coal feed rate of the pulverizer is high, as the coal feed rate of the pulverizer increases, the frequency of the dynamic and static combined rotating separator motor remains unchanged and is not adjusted, resulting in the coal powder fineness being higher when the coal feed rate is high, that is, the coal powder is coarser, which will lead to incomplete combustion of the coal powder, increased coal loss, and reduced economic efficiency.

[0003] The coal blocks enter the grinding bin from the feeding port, and the ground coal powder enters the separation bin. The large particles are separated and fall back into the grinding bin. The coal powder enters the combustion device from the coal powder outlet pipe. In the separation bin, most coal-fired power plants use coal powder separators in their pulverizing systems to screen the coal powder that meets the fineness standards and discharge it. The coal powder that does not meet the fineness standards remains in the system for further grinding.

[0004] However, in the existing technology, the setting of the coal powder separator can only control the fineness of the discharged coal powder, and cannot control the fineness of all the coal powder produced in the system in real time. The produced coal powder may form agglomerates due to environmental reasons and cannot be discharged out of the cabin. At the same time, there is a problem that large particles of coal powder are stuck in the separator during the continuous circulation process and cannot re-enter the grinding chamber, resulting in the gradual increase of large particles of coal powder in the grinding chamber. Summary of the Invention

[0005] To this end, the present invention provides a circulating coal grinding equipment with adjustable coal powder fineness, which effectively solves the problem in the prior art that it is impossible to control the fineness of all coal powder produced in the system in real time, and the produced coal powder may form agglomerates due to environmental reasons and cannot be discharged out of the cabin. At the same time, it faces the problem that large particles of coal powder are stuck in the separator during the continuous circulation process and cannot re-enter the grinding chamber, resulting in the gradual increase of large particles of coal powder in the grinding chamber.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: a circulating coal grinding device with adjustable coal powder fineness, comprising:

[0007] A coal mill chamber, wherein a coal drop pipe is provided at its hatch, and grinding rollers are provided in the coal mill chamber, and the grinding rollers cooperate with the inner wall of the coal mill chamber to roll and grind the coal blocks to form coal particles. A first air inlet is formed on the circumferential side of the inner wall of the bottom of the coal mill chamber and is arranged close to the inner wall of the bottom of the coal mill chamber, and discharge ports are provided on both sides of the bottom of the coal mill chamber;

[0008] An impact sleeve is connected to the output end of the discharge port. A first pumping pump is provided in the discharge port. The first pumping pump forms a negative pressure in the discharge port and discharges the coal particles transported to the discharge port at a higher speed than the feed. Two impact sleeves are provided, and a triple cabin is provided between them. The impact sleeves are in the same straight line. A gravity cylinder is provided at the bottom of the triple cabin. A plurality of impact holes are formed in the impact sleeve. The impact holes between the impact sleeves correspond to each other one by one. The coal particles pass through the impact holes to form a coal particle impact flow, forming a counter-impact collision in the triple cabin to obtain coal powder.

[0009] An air-blast separator is provided at the end of the gravity cylinder. A return channel is provided directly above the air-blast separator. The end of the return channel is connected to the coal mill chamber. The air-blast separator is provided with an external extension frame. The end of the extension frame is introduced into the air-blast separator and is connected to the output port opened at the other end. The extension frame is provided with a hollow structure. A plurality of leakage holes are opened on the extension frame. The coal powder enters the extension frame through the leakage holes and is discharged through the output port.

[0010] The size of the coal particles in the coal particle impact flow can be adjusted by adjusting the area of ​​the opening portion of the impact blocking hole.

[0011] Furthermore,

[0012] A first air pump is installed outside the first air inlet;

[0013] The bottom of the discharge port is connected to a connecting pipe, and the end of the connecting pipe is connected to an impact sleeve;

[0014] The connecting pipe is arc-shaped.

[0015] Furthermore,

[0016] The impact sleeve includes a first feeding cylinder, a first adjusting cylinder and a first discharging cylinder;

[0017] The first adjusting cylinder is connected to the first connecting cylinder and the second connecting cylinder at both ends respectively. The first adjusting cylinder is connected to the first feeding cylinder via the first connecting cylinder, and the first adjusting cylinder is connected to the first discharging cylinder via the second connecting cylinder.

[0018] The inner diameter of the first connecting cylinder is consistent with the outer diameter of the first feeding cylinder, and the inner diameter of the second connecting cylinder is consistent with the outer diameter of the first discharging cylinder;

[0019] The first discharge barrel is connected to one of the horizontal hatches of the triple cabin.

[0020] Furthermore,

[0021] An outlet plate is provided at the outlet end of the first feed barrel, and the outlet plate seals the outlet portion of the first feed barrel;

[0022] The impact hole is provided through the outlet plate;

[0023] The inner radius of the first discharge cylinder is greater than the distance from the impact hole to the center position of the outlet plate.

[0024] Furthermore,

[0025] The impact hole is configured as a square;

[0026] Two limit blocks are provided on the outer side wall of the outlet plate, an adjustment plate is provided between the limit blocks, the adjustment plate at least partially corresponds to the outlet end of the impact hole, and the adjustment plate and the end of the impact hole form a first adjustment hole;

[0027] The size of the first adjustment hole gradually increases from the top point along the circumferential direction, and the arrangement order of the first adjustment holes on the impact sleeve at the opposite position is opposite to the arrangement order of the first adjustment holes of the impact sleeve;

[0028] The end of the adjustment plate is arc-shaped, a limit plate is provided on the outside of the adjustment plate, and the limit plate and the limit block are connected by a spring;

[0029] An installation groove is formed on the inner wall of the first adjustment cylinder, and the end of the adjustment plate is inserted into the installation groove.

[0030] Furthermore,

[0031] First meshing teeth are arranged at equal intervals on the outer circumference of the first adjustment cylinder, a first driving gear is arranged outside the first adjustment cylinder, and a first driving motor is connected to the first driving gear;

[0032] The first driving gear meshes with the first meshing teeth.

[0033] Furthermore,

[0034] The impact hole is configured as a circle;

[0035] An adjustment plate is connected to the first adjustment cylinder, wherein at least a portion of the adjustment plate corresponds to the outlet end of the impact hole, and the adjustment plate and the opening of the impact hole form a second adjustment hole;

[0036] The size of the second adjustment hole gradually increases from the top point along the circumferential direction, and the arrangement order of the second adjustment holes on the impact sleeve at the relative position is opposite to the arrangement order of the second adjustment holes of the impact sleeve.

[0037] Furthermore,

[0038] The width of the adjustment plate is not less than the diameter of the impact hole.

[0039] Furthermore,

[0040] Second meshing teeth are arranged at equal intervals on the outer circumference of the first adjustment cylinder, a second driving gear is arranged outside the first adjustment cylinder, and a second driving motor is connected to the second driving gear;

[0041] The second driving gear is engaged with the second engaging teeth.

[0042] Furthermore,

[0043] The air-blast separator includes a separation cabin, a collecting seat arranged at the bottom of the separation cabin, and a fan arranged in the collecting seat;

[0044] The extension frame extends to the outside of the collecting seat, and the extension frame is connected along the length direction, and one end of the extension frame is connected to the fan, and the other end is connected to the output port;

[0045] The extension frames are provided in a plurality of numbers, and the extension frames extending out of the collecting seat are arc-shaped;

[0046] A second pumping pump is provided in the return channel.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] In the present invention, a discharge port is provided at the bottom of the coal mill chamber, and an impact sleeve is provided at the output end of the discharge port. A plurality of impact holes are formed in the impact sleeve, and the impact holes between the impact sleeves correspond to each other. Coal particles pass through the impact holes to form a coal particle impact flow, and form a counter-impact collision in the triple chamber to obtain coal powder. The size of the coal particles in the coal particle impact flow can be adjusted by adjusting the area of ​​the part that blocks the opening of the impact hole. By controlling the size of the coal particles in the coal particle impact flow, the fineness of the finally obtained coal powder can be adjusted. Moreover, the impact of the coal particles can disperse the coal powder in a lump, thereby preventing the coal powder in a lump from accumulating and getting stuck in the air impact separator, thereby realizing the regulation of the fineness of the coal powder.

[0049] In addition, in the air-blast separator, the end of the extension frame is introduced into the air-blast separator and connected to the output port opened at the other end. A number of leakage holes are opened on the extension frame. Under the action of air pressure, the coal powder with fineness that meets the standard enters the extension frame through the leakage holes and is discharged through the output port. The coal powder with substandard fineness is blown away from the leakage holes by the air at the leakage holes and re-enters the coal grinding chamber through the return channel for grinding, thereby avoiding the situation where the coal powder with substandard fineness is stuck in the air-blast separator in the machine body, causing the coal powder in the chamber to gradually increase. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0051] Figure 1 A schematic structural diagram of a circulating coal grinding device with adjustable coal powder fineness provided in an embodiment of the present invention;

[0052] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of A;

[0053] Figure 3 Schematic diagram of the cross-sectional structure of the bottom of the coal grinding chamber in an embodiment of the present invention;

[0054] Figure 4 is a schematic diagram of the cross-sectional structure of one of the impact sleeves in the first embodiment;

[0055] Figure 5 is a schematic diagram of the cross-sectional structure of the impact sleeve at relative positions in the first embodiment;

[0056] Figure 6 Schematic diagram of the structure of the first adjustment hole when the first adjustment cylinder rotates in the first embodiment;

[0057] Figure 7 Schematic diagram of the structure of the impact sleeve in the first embodiment;

[0058] Figure 8 is a schematic cross-sectional structural diagram of one of the impact sleeves in the second embodiment;

[0059] Figure 9 is a schematic cross-sectional structural diagram of the impact sleeve at relative positions in the second embodiment;

[0060] Figure 10 This is a schematic diagram of the structure in which the adjustment plate rotates and the second adjustment hole has two impact areas in the second embodiment;

[0061] Figure 11 It is a structural schematic diagram of the second embodiment in which the adjustment plate rotates and the second adjustment hole is converted into an impact area;

[0062] Figure 12 for Figure 10 Schematic diagram of the enlarged structure of B;

[0063] Figure 13 for Figure 11 Schematic diagram of the enlarged structure of B;

[0064] Figure 14 Schematic diagram of the structure of the impact sleeve in the second embodiment;

[0065] Figure 15 Schematic diagram of the structure of the air shock separator in an embodiment of the present invention.

[0066] The numbers in the figure represent the following:

[0067] 1- coal mill chamber; 2- impact sleeve; 3- air impact separator; 4- coal drop pipe; 5- grinding roller; 6- first air inlet; 7- discharge port; 8- first extraction pump; 9- triple chamber; 10- gravity cylinder; 11- impact hole; 12- return channel; 13- first air pump; 14- connecting pipe;

[0068] 21-first feeding cylinder; 22-first adjusting cylinder; 23-first discharging cylinder; 24-first connecting cylinder; 25-second connecting cylinder; 26-exit plate; 27-limiting block; 28-adjusting plate; 29-first adjusting hole; 210-limiting plate; 211-spring; 212-mounting slot; 213-first meshing tooth; 214-first driving gear; 215-first driving motor; 216-adjusting plate; 217-second adjusting hole; 218-second meshing tooth; 219-second driving gear; 2110-second driving motor;

[0069] 31- extension frame; 32- output port; 33- leakage hole; 34- separation cabin; 35- collection seat; 36- fan; 37- second extraction pump. DETAILED DESCRIPTION

[0070] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0071] like Figure 1 As shown, the present invention provides a circulating coal grinding equipment with adjustable coal powder fineness, which is equipped with a coal grinding chamber 1, an impact sleeve 2 and an air impact separator 3.

[0072] like Figure 1 and Figure 3 As shown, the coal mill chamber 1 is provided with a coal drop pipe 4 at its hatch, and grinding rollers 5 are provided in the coal mill chamber 1. The grinding rollers 5 cooperate with the inner wall of the coal mill chamber 1 to roll and grind the coal blocks to form coal particles. A first air inlet 6 is formed on the peripheral side of the inner wall of the bottom of the coal mill chamber 1 and is arranged along the direction close to the inner wall of the bottom of the coal mill chamber 1. Discharge ports 7 are opened on both sides of the bottom of the coal mill chamber 1.

[0073] The impact sleeve 2 is connected to the output end of the discharge port 7. A first pumping pump 8 is provided in the discharge port 7. The first pumping pump 8 forms a negative pressure in the discharge port 7 and discharges the coal particles transported to the discharge port 7 at a speed higher than the feed rate. Two impact sleeves 2 are provided, and a triple cabin 9 is provided between them. The impact sleeves 2 are on the same straight line. A gravity cylinder 10 is provided at the bottom of the triple cabin 9. Several impact holes 11 are formed in the impact sleeve 2. The impact holes between the impact sleeves 2 correspond to each other one by one. The coal particles pass through the impact holes 11 to form a coal particle impact flow and form a counter-collision in the triple cabin 9 to obtain coal powder.

[0074] The air shock separator 3 is arranged at the end of the gravity cylinder 10, and a return channel 12 is arranged directly above the air shock separator 3. The end of the return channel 12 is connected to the coal grinding chamber 1. The air shock separator 3 has an extension frame 31 arranged outside. The end of the extension frame 31 is introduced into the air shock separator 3 and is connected to the output port 32 opened at the other end. The extension frame 31 is set to a hollow structure, and a number of leakage holes 33 are opened on the extension frame 31. The coal powder enters the extension frame 31 through the leakage holes 33 and is discharged through the output port 32.

[0075] The size of the coal particles in the coal particle impact flow can be adjusted by adjusting the area of ​​the opening portion of the impact blocking hole 11 .

[0076] In the present invention, a discharge port 7 is provided at the bottom of the coal grinding chamber 1, and an impact sleeve 2 is provided at the output end of the discharge port 7. A plurality of impact holes 11 are formed in the impact sleeve 2, and the impact holes 11 between the impact sleeves 2 correspond to each other one by one. Coal particles pass through the impact holes 11 to form a coal particle impact flow, and form a counter-collision in the triple chamber 9 to obtain coal powder. The size of the coal particles in the coal particle impact flow can be adjusted by adjusting the area of ​​the opening part of the impact hole 11. The fineness of the final coal powder can be adjusted by controlling the size of the coal particles in the coal particle impact flow, and the coal powder can be dispersed into block-shaped blocks by impacting the coal particles, thereby avoiding the accumulation of block-shaped coal powder and getting stuck on the air impact separator, thereby realizing the regulation of the fineness of the coal powder.

[0077] In addition, in the air-blast separator 3, the end of the extension frame 31 is introduced into the air-blast separator 3 and is connected to the output port 32 opened at the other end. A number of leakage holes 33 are opened on the extension frame 31. Under the action of air pressure, the coal powder with fineness that meets the standard enters the extension frame 31 through the leakage hole 33 and is discharged through the output port 32. The coal powder with substandard fineness is blown away from the leakage hole 33 by the air at the leakage hole 33 and re-enters the coal mill chamber 1 for grinding through the return channel 12, thereby avoiding the situation where the coal powder with substandard fineness is stuck in the air-blast separator 3 in the machine body, causing the coal powder in the chamber to gradually increase.

[0078] The coal blocks fall into the coal mill chamber 1 from the coal drop pipe 4, are gradually rolled into coal particles under the rolling of the grinding roller 5, and enter the coal mill chamber 1. In order to arrange the coal particles of different fineness in a non-zoning manner, the present invention also provides a first air inlet 6, and a first air pump 13 is installed outside the first air inlet 6. Gas is discharged into the first air inlet 6 through the first air pump 13, pushing the coal particles in the direction opposite to the first air inlet 6 to move along the circumferential direction. During the movement, the coal particles are discharged from the discharge port 7.

[0079] A connecting pipe 14 is connected to the bottom of the discharge port 7 , and the end of the connecting pipe 14 is connected to the impact sleeve 2 . The connecting pipe 14 is arc-shaped.

[0080] The coal particles enter the connecting pipe 14 from the discharge port 7. Under the action of the first pumping pump 8, the driving force for the coal particles to enter the discharge port 7 is further increased. Under the action of the first pumping pump 8, the coal particles transported to the discharge port 7 are discharged at a higher speed than the feed speed, and form a coal particle impact flow at a higher speed through the connecting pipe 14 and the impact hole 11.

[0081] The present invention uses a method of colliding coal particles of various sizes. In actual application, the size of the coal particles in the coal particle impact flow determines the fineness of the coal powder finally obtained. Specifically, the fineness of the coal powder is related to the size of the colliding coal particles and the number of impact points. When the number of impact points is not considered, the larger the coal particle size, the roughly unchanged number of impact points, the greater the fineness of the coal powder separated after the impact of the impacted coal particles, and the finer the coal powder obtained. When the size of the coal particles is smaller, the finer the coal powder obtained. The above analysis is for reference only. When adjusting the size of the coal particles in the coal particle impact flow, the fineness of the coal powder can be roughly adjusted, and the coal particles can be broken into blocks.

[0082] To this end, the present invention discloses the following two embodiments, the first embodiment of which is:

[0083] like Figure 2 、 Figure 7 、 Figure 14 As shown, the impact sleeve 2 includes a first feed cylinder 21, a first adjusting cylinder 22 and a first discharge cylinder 23. The two ends of the first adjusting cylinder 22 are respectively connected to the first connecting cylinder 24 and the second connecting cylinder 25. The first adjusting cylinder 22 is installed and connected to the first feed cylinder 21 through the first connecting cylinder 24, and the first adjusting cylinder 22 is installed and connected to the first discharge cylinder 23 through the second connecting cylinder 25. The first discharge cylinder 23 is connected to one of the horizontal hatches of the triple cabin 9.

[0084] The first feeding cylinder 21 , the first connecting cylinder 24 , the first adjusting cylinder 22 , the second connecting cylinder 25 and the first discharging cylinder 23 are connected in sequence. The first connecting cylinder 24 , the first adjusting cylinder 22 and the second connecting cylinder 25 are an integrated structure, and the integrated structure can rotate.

[0085] The inner diameter of the first connecting cylinder 24 is consistent with the outer diameter of the first feeding cylinder 21 , and the inner diameter of the second connecting cylinder 25 is consistent with the outer diameter of the first discharging cylinder 23 . The first feeding cylinder 21 and the first connecting cylinder 24 , and the second connecting cylinder 25 and the first discharging cylinder 23 are always sealed.

[0086] In order to arrange the impact holes 11 , an outlet plate 26 is provided at the outlet end of the first feed barrel 21 . The outlet plate 26 seals the outlet portion of the first feed barrel 21 , and the impact holes 11 are provided through the outlet plate 26 .

[0087] In order to allow the coal particle impact flow to smoothly pass through the impact hole 11 into the first discharge barrel 23 without interfering with the inner wall of the first discharge barrel 23, it is necessary to make the internal radius of the first discharge barrel 23 larger than the distance from the impact hole 11 to the center position of the outlet plate 26.

[0088] Among them, such as Figure 4 As shown, the impact hole 11 is set to be square, and two limit blocks 27 are set on the outer wall of the outlet plate 26. An adjustment plate 28 is set between the limit blocks 27. The adjustment plate 28 at least partially corresponds to the outlet end of the impact hole 11. The adjustment plate 28 and the end of the impact hole 11 form a first adjustment hole 29. The size of the first adjustment hole 29 gradually increases along the circumferential direction from the first adjustment hole 29 at the top. Figure 5 As shown, the arrangement order of the first adjustment holes 29 on the impact sleeve 2 at the relative position is opposite to the arrangement order of the first adjustment holes 29 of the impact sleeve 2 .

[0089] Taking the figure as an example, Figure 4 As shown, in the impact sleeve 2 located on the left, the size of the top first adjustment hole 29 is the smallest, and the size of the bottom first adjustment hole 29 is the largest. It can be seen that the size of the first adjustment hole 29 gradually increases from top to bottom (viewed counterclockwise or clockwise), and correspondingly, the length of the adjustment plate 28 gradually becomes smaller, so that the coal particle size a in the coal particle impact flow impacted by the first adjustment hole 29 located at the top is smaller, and the coal particle size b in the coal particle impact flow impacted by the first adjustment hole 29 located at the bottom is larger.

[0090] like Figure 5 As shown, in the impact sleeve 2 at a relative position (located on the right), the size of the top first adjustment hole 29 is the largest, and the size of the bottom first adjustment hole 29 is the smallest. It can be seen that the size of the first adjustment hole 29 gradually becomes smaller from top to bottom (viewed counterclockwise or clockwise), and correspondingly, the length of the adjustment plate 28 gradually becomes larger, so that the coal particle size b in the coal particle impact flow impacted by the first adjustment hole 29 located at the top is larger, and the coal particle size a in the coal particle impact flow impacted by the first adjustment hole 29 located at the bottom is smaller.

[0091] In the above case, the coal particle impact flow at the top is the mutual impact of coal particles of size b and coal particles of size a. From top to bottom, the sizes of coal particles in the mutually impacting coal particle impact flow gradually tend to be the same and then gradually become larger. This setting of coal particle impact of multiple sizes can ensure multi-size impact and avoid the situation where coal particles of some sizes cannot be effectively separated.

[0092] In order to adjust the size of the coal particles in the coal particle impact flow, the present invention also makes the following design: the end of the adjusting plate 28 is arc-shaped, and a limiting plate 210 is provided on the outside of the adjusting plate 28. The limiting plate 210 and the limiting block 27 are connected by a spring 211. An installation groove 212 is provided on the inner wall of the first adjusting cylinder 22, and the end of the adjusting plate 28 is stuck in the installation groove 212.

[0093] like Figure 4 and Figure 7 As shown, first meshing teeth 213 are evenly spaced on the outer circumference of the first adjustment cylinder 22 , a first driving gear 214 is provided outside the first adjustment cylinder 22 , a first driving motor 215 is connected to the first driving gear 214 , and the first driving gear 214 meshes with the first meshing teeth 213 .

[0094] The first driving motor 215 drives the first driving gear 214 to rotate, and drives the first adjusting cylinder 22 to rotate through the first meshing teeth 213. Figure 6 As shown, the rotation of the first adjusting cylinder 22 drives the installation slot 212 to rotate. During the rotation of the installation slot 212, the adjusting plate 28 is driven to move gradually inward, the spring 211 is gradually squeezed, and the area of ​​the adjusting plate 28 blocking the impact hole 11 gradually increases. The size of the corresponding first adjusting hole 29 also gradually becomes smaller, so that the size of the coal particles in the impact flow of the coal particles that impact each other becomes smaller, and the fineness of the coal powder obtained by the final impact separation is smaller.

[0095] The second embodiment is:

[0096] like Figure 8 、 Figure 14 As shown, the impact sleeve 2 includes a first feed cylinder 21, a first adjusting cylinder 22 and a first discharge cylinder 23. The two ends of the first adjusting cylinder 22 are respectively connected to the first connecting cylinder 24 and the second connecting cylinder 25. The first adjusting cylinder 22 is installed and connected to the first feed cylinder 21 through the first connecting cylinder 24, and the first adjusting cylinder 22 is installed and connected to the first discharge cylinder 23 through the second connecting cylinder 25. The first discharge cylinder 23 is connected to one of the horizontal hatches of the triple cabin 9.

[0097] The first feeding cylinder 21 , the first connecting cylinder 24 , the first adjusting cylinder 22 , the second connecting cylinder 25 and the first discharging cylinder 23 are connected in sequence. The first connecting cylinder 24 , the first adjusting cylinder 22 and the second connecting cylinder 25 are an integrated structure, and the integrated structure can rotate.

[0098] The inner diameter of the first connecting cylinder 24 is consistent with the outer diameter of the first feeding cylinder 21 , and the inner diameter of the second connecting cylinder 25 is consistent with the outer diameter of the first discharging cylinder 23 . The first feeding cylinder 21 and the first connecting cylinder 24 , and the second connecting cylinder 25 and the first discharging cylinder 23 are always sealed.

[0099] In order to arrange the impact holes 11 , an outlet plate 26 is provided at the outlet end of the first feed barrel 21 . The outlet plate 26 seals the outlet portion of the first feed barrel 21 , and the impact holes 11 are provided through the outlet plate 26 .

[0100] In order to allow the coal particle impact flow to smoothly pass through the impact hole 11 into the first discharge barrel 23 without interfering with the inner wall of the first discharge barrel 23, it is necessary to make the internal radius of the first discharge barrel 23 larger than the distance from the impact hole 11 to the center position of the outlet plate 26.

[0101] Among them, such as Figure 8 As shown, the impact hole 11 is set to be circular, and an adjustment plate 216 is connected to the first adjustment cylinder 22. The adjustment plate 216 at least partially corresponds to the outlet end of the impact hole 11. The adjustment plate 216 and the opening of the impact hole 11 form a second adjustment hole 217. The size of the second adjustment hole 217 gradually increases along the circumferential direction from the second adjustment hole 217 at the top. Figure 9 As shown, the arrangement order of the second adjustment holes 217 on the impact sleeve 2 at the relative position is opposite to the arrangement order of the second adjustment holes 217 of the impact sleeve 2.

[0102] Taking the figure as an example, Figure 8 As shown, in the impact sleeve 2 located on the left, the size of the second adjustment hole 217 at the top is the smallest, and the size of the second adjustment hole 217 at the bottom is the largest. It can be seen that the size of the second adjustment hole 217 gradually increases from top to bottom (viewed counterclockwise or clockwise), and correspondingly, the length of the adjustment plate 216 gradually becomes smaller, so that the size of the coal particles in the coal particle impact flow impacted by the second adjustment hole 217 at the top is smaller, and the size of the coal particles in the coal particle impact flow impacted by the second adjustment hole 217 at the bottom is larger.

[0103] like Figure 9 As shown, in the impact sleeve 2 at a relative position (located on the right), the size of the second adjustment hole 217 at the top is the largest, and the size of the second adjustment hole 217 at the bottom is the smallest. It can be seen that the size of the second adjustment hole 217 from top to bottom (viewed counterclockwise or clockwise) gradually becomes smaller, and correspondingly, the length of the adjustment plate 216 gradually becomes larger, so that the size of the coal particles in the coal particle impact flow impacted by the second adjustment hole 217 at the top can be larger, and the size of the coal particles in the coal particle impact flow impacted by the second adjustment hole 217 at the bottom can be smaller.

[0104] Similar to the first embodiment, the setting of impact of coal particles of various sizes can ensure multi-size impact and avoid the situation where coal particles of certain sizes cannot be effectively separated.

[0105] In order to ensure that one second adjustment hole 217 corresponds to one impact area in the initial state, the present invention makes the following design: the width of the adjustment plate 216 is not less than the diameter of the impact hole 11 .

[0106] In addition, in order to adjust the size of the coal particles in the coal particle impact flow, second meshing teeth 218 are arranged at equal intervals on the outer peripheral side of the first adjusting cylinder 22, and a second driving gear 219 is arranged outside the first adjusting cylinder 22. The second driving gear 219 is connected to the second driving motor 2110, and the second driving gear 219 is engaged with the second meshing teeth 218.

[0107] The second driving motor 2110 drives the second driving gear 219 to rotate, and drives the adjustment plate 216 to rotate through the second meshing teeth 218 .

[0108] Assuming that the symmetry axis of the adjustment plate 216 is aligned with the diameter direction of the impact hole 11 in the initial state, during the rotation of the adjustment plate 216, the second adjustment hole 217 formed between the adjustment plate 216 and the impact hole 11 forms two impact areas, such as Figure 10 and Figure 12 As shown, one is at the bottom of the impact hole 11 and the other is at the side of the impact hole 11. That is, a second adjustment hole 217 forms two areas for the coal particle impact flow to pass through. The increase in the number of areas can increase the efficiency of coal particle separation based on the initial state.

[0109] Then the adjustment plate 216 continues to rotate, as shown in FIG. Figure 11 and Figure 13 As shown, the two impact areas form one impact area, and the area gradually increases during the rotation process. Correspondingly, in this process, the size of the coal particles in the coal particle impact flow gradually increases.

[0110] In actual application, the enlargement of the second adjustment hole 217 can further improve the efficiency of coal particle separation, but it may cause the coal particle size to become larger and the final coal powder fineness to increase. Therefore, in response to the above situation, the adjustment plate 216 is gradually rotated to form two impact areas and the size only increases within a certain range. This can improve the separation efficiency while ensuring the coal powder fineness.

[0111] The present invention also provides an air shock separator 3, such as Figure 1 and Figure 15As shown, the air shock separator 3 includes a separation cabin 34, a collecting seat 35 arranged at the bottom of the separation cabin 34, and a fan 36 arranged in the collecting seat 35. The extension frame 31 extends to the outside of the collecting seat 35. The extension frame 31 is connected along the length direction, and one end of it is connected to the fan 36, and the other end is connected to the output port 32.

[0112] There are multiple extension frames 31 , and the extension frames 31 extending out of the collecting seat 35 are arc-shaped.

[0113] Driven by the fan 36, gas is injected into the extension frame 31. Part of the gas drives the coal powder that has entered the leakage hole 33 to be discharged into the output port 32, and the other part of the gas blows the coal powder outside the leakage hole 33 away from the leakage hole. Some coal powder that meets the fineness standard but fails to enter the leakage hole in time can also enter the leakage hole 33 on other extension frames 31 under the encouragement of the gas in the extension frame 31.

[0114] A second pumping pump 37 is provided in the return channel 12. At regular intervals, the second pumping pump 37 in the return channel 12 drives the coal powder that does not meet the fineness standards in the separation cabin 34 to be pumped out into the coal grinding cabin 1 for re-rolling.

[0115] The above embodiments are merely exemplary embodiments of the present application and are not intended to limit the scope of the present application. The scope of protection of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and scope of protection of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present application.

Claims

1. A circulating coal grinding equipment with adjustable coal powder fineness, characterized in that: have: A coal mill chamber (1) is provided with a coal drop pipe (4) at its hatch, a grinding roller (5) is provided in the coal mill chamber (1), and the grinding roller (5) cooperates with the inner wall of the coal mill chamber (1) to roll and grind the coal blocks to form coal particles, a first air inlet (6) is formed on the circumferential side of the inner wall of the bottom of the coal mill chamber (1) and is arranged in a direction close to the inner wall of the bottom of the coal mill chamber (1), and discharge ports (7) are opened on both sides of the bottom of the coal mill chamber (1); An impact sleeve (2) is connected to the output end of the discharge port (7), a first pumping pump (8) is provided in the discharge port (7), the first pumping pump (8) forms a negative pressure in the discharge port (7), and discharges the coal particles transported to the discharge port (7) at a speed higher than the feed rate, the impact sleeves (2) are provided in two, and a triple cabin (9) is provided between them, the impact sleeves (2) are on the same straight line, a gravity cylinder (10) is provided at the bottom of the triple cabin (9), a plurality of impact holes (11) are formed in the impact sleeve (2), the impact holes between the impact sleeves (2) are in one-to-one correspondence, the coal particles pass through the impact holes (11) to form a coal particle impact flow, and form a counter-impact collision in the triple cabin (9) to obtain coal powder; An air-blast separator (3) is provided at the end of the gravity cylinder (10); a return channel (12) is provided directly above the air-blast separator (3); an end of the return channel (12) is connected to the coal mill chamber (1); the air-blast separator (3) is provided with an extension frame (31) provided outside; an end of the extension frame (31) is introduced into the air-blast separator (3) and communicated with an output port (32) provided at the other end; the extension frame (31) is provided with a hollow structure; a plurality of leakage holes (33) are provided on the extension frame (31); the coal powder enters the extension frame (31) through the leakage holes (33) and is discharged through the output port (32); The size of the coal particles in the coal particle impact flow can be adjusted by adjusting the area of ​​the opening portion of the impact blocking hole (11).

2. The circulating coal grinding equipment with adjustable coal powder fineness according to claim 1, characterized in that: A first air pump (13) is installed outside the first air inlet (6); The bottom of the discharge port (7) is connected to a connecting pipe (14), and the end of the connecting pipe (14) is connected to the impact sleeve (2); The connecting pipe (14) is arc-shaped.

3. The circulating coal grinding equipment with adjustable coal powder fineness according to claim 2, characterized in that: The impact sleeve (2) comprises a first feeding cylinder (21), a first regulating cylinder (22) and a first discharging cylinder (23); The first adjusting cylinder (22) is connected to a first connecting cylinder (24) and a second connecting cylinder (25) at both ends thereof, the first adjusting cylinder (22) is connected to the first feeding cylinder (21) via the first connecting cylinder (24), and the first adjusting cylinder (22) is connected to the first discharging cylinder (23) via the second connecting cylinder (25); The inner diameter of the first connecting cylinder (24) is consistent with the outer diameter of the first feeding cylinder (21), and the inner diameter of the second connecting cylinder (25) is consistent with the outer diameter of the first discharging cylinder (23); The first discharge barrel (23) is connected to one of the horizontal hatches of the triple cabin (9).

4. The circulating coal grinding equipment with adjustable coal powder fineness according to claim 3, characterized in that: An outlet plate (26) is provided at the outlet end of the first feed barrel (21), and the outlet plate (26) seals the outlet portion of the first feed barrel (21); The impact hole (11) is provided through the outlet plate (26); The inner radius of the first discharge barrel (23) is greater than the distance from the impact hole (11) to the center position of the outlet plate (26).

5. The circulating coal grinding equipment with adjustable coal powder fineness according to claim 4, characterized in that: The impact hole (11) is configured in a square shape; Two limit blocks (27) are provided on the outer side wall of the outlet plate (26), an adjustment plate (28) is provided between the limit blocks (27), the adjustment plate (28) at least partially corresponds to the outlet end of the impact hole (11), and the adjustment plate (28) and the end of the impact hole (11) form a first adjustment hole (29); The size of the first adjustment hole (29) gradually increases along the circumferential direction starting from the topmost point, and the arrangement order of the first adjustment holes (29) on the impact sleeve (2) at the relative position is opposite to the arrangement order of the first adjustment holes (29) of the impact sleeve (2); The end of the adjustment plate (28) is arc-shaped, and a limiting plate (210) is provided on the outside of the adjustment plate (28), and the limiting plate (210) and the limiting block (27) are connected via a spring (211); The inner wall of the first adjustment cylinder (22) is provided with a mounting groove (212), and the end of the adjustment plate (28) is snapped into the mounting groove (212).

6. The circulating coal grinding equipment with adjustable coal powder fineness according to claim 5, characterized in that: First meshing teeth (213) are arranged at equal intervals on the outer circumference of the first adjustment cylinder (22); a first driving gear (214) is arranged outside the first adjustment cylinder (22); and a first driving motor (215) is connected to the first driving gear (214); The first driving gear (214) meshes with the first meshing teeth (213).

7. The circulating coal grinding equipment with adjustable coal powder fineness according to claim 4, characterized in that: The impact hole (11) is configured to be circular; An adjustment plate (216) is connected to the inside of the first adjustment cylinder (22), and the adjustment plate (216) at least partially corresponds to the outlet end of the impact hole (11), and the adjustment plate (216) and the opening portion of the impact hole (11) form a second adjustment hole (217); The size of the second adjustment hole (217) gradually increases along the circumferential direction starting from the vertex, and the arrangement order of the second adjustment holes (217) on the impact sleeve (2) at the relative position is opposite to the arrangement order of the second adjustment holes (217) of the impact sleeve (2).

8. The circulating coal grinding equipment with adjustable coal powder fineness according to claim 7, characterized in that: The width of the adjustment plate (216) is not less than the diameter of the impact hole (11).

9. The circulating coal grinding equipment with adjustable coal powder fineness according to claim 8, characterized in that: Second meshing teeth (218) are arranged at equal intervals on the outer circumference of the first adjustment cylinder (22), a second driving gear (219) is arranged outside the first adjustment cylinder (22), and a second driving motor (2110) is connected to the second driving gear (219); The second driving gear (219) is engaged with the second meshing teeth (218).

10. The circulating coal grinding equipment with adjustable coal powder fineness according to claim 6 or 9, characterized in that: The air-blast separator (3) comprises a separation cabin (34), a collecting seat (35) arranged at the bottom of the separation cabin (34), and a fan (36) arranged in the collecting seat (35); The extension frame (31) extends to the outside of the collecting seat (35), the extension frame (31) is connected along the length direction, and one end thereof is connected to the fan (36), and the other end is connected to the output port (32); The extension frames (31) are provided in a plurality, and the extension frames (31) extending out of the collecting seat (35) are arc-shaped; A second pumping pump (37) is provided in the return channel (12).

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