Crushing and conveying device for dry lime desulfurization

Abstract

The invention belongs to the technical field of crushing and conveying, and discloses a crushing and conveying device for dry lime desulfurization, which comprises a crushing box, a feeding hole is formed in the crushing box, a large rotating shaft is arranged in the crushing box, a plurality of large crushing blades are arranged on the large rotating shaft, one end of the large rotating shaft is connected with a driving structure, the end part of the large rotating shaft is connected with a screen layer, and a screen is arranged in the screen layer. Meshing teeth are partially installed on the periphery of the screening layer at equal intervals, a circulating barrel is installed at the position, right opposite to the screening layer, of the outer wall of the smashing box, a transmission structure is installed outside the circulating barrel, a push column is arranged in the circulating barrel, the meshing teeth are in transmission connection with the transmission structure, and a secondary smashing barrel is arranged on the inner wall, close to the circulating barrel, of the smashing box. Lime particles are subjected to secondary crushing and then fall onto the screen to be re-screened, the process is repeated until all lime blocks are crushed into lime powder, and the problem that the desulfurization effect is poor is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of crushing and conveying, and in particular to a crushing and conveying device for dry lime desulfurization. Background Art

[0002] The sulfur dioxide produced by coal combustion will form acid rain when released into the air. In industrial production, lime powder is usually added to coal to remove the sulfur dioxide produced by coal combustion. This desulfurization method requires a large amount of lime powder. In order to reduce production costs, factories usually purchase lime blocks, then crush the lime blocks into lime powder and then add it to the coal.

[0003] In order to crush the lime blocks and transport them into the coal, the existing technology usually connects the crusher with the conveying equipment. The crusher mainly includes a powder hopper, a driving motor installed on the powder hopper, a large rotating shaft installed at the driving end of the driving motor, and several crushing blades installed on the large rotating shaft. The large rotating shaft passes through the powder hopper. When in use, the driving motor is started to drive the large rotating shaft to rotate, and the lime blocks are put into the powder hopper from the feeding port on the powder hopper. Under the cutting of the high-speed rotating large rotating shaft and the crushing blades, the lime blocks are crushed into lime powder and enter the screw conveyor from the discharge port below the powder hopper, and are transported to the coal box by the screw conveyor.

[0004] In the prior art, if too much lime blocks are added at one time, the crushing blades will find it difficult to completely crush the lime blocks into lime powder. Instead, they will be crushed into lime particles with a larger diameter than the lime powder. The contact area between the lime particles and sulfur dioxide is smaller than that of the lime powder. If they are directly added to the coal, the desulfurization effect will be poor. Summary of the Invention

[0005] To this end, the present invention provides a crushing and conveying device for dry lime desulfurization to solve the technical problem in the prior art that too much lime blocks are added at one time, and the crushing blades crush them into larger lime particles. If they are directly added to the coal, the desulfurization effect will be poor.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0007] A crushing and conveying device for dry lime desulfurization, comprising a crushing box, the crushing box being provided with a material inlet, a large rotating shaft being provided in the crushing box, a plurality of large crushing blades being provided on the large rotating shaft, one end of the large rotating shaft passing through the crushing box and being connected to a driving structure;

[0008] The crushing box is opened on one side away from the feed port and forms a discharge port. The end of the large rotating shaft is connected to a screen layer, which is located at the bottom of the discharge port. A screen is provided in the screen layer, and meshing teeth are installed on a portion of the outer circumference of the screen layer at equal intervals.

[0009] A circulation barrel is installed on the outer wall of the crushing box at a position corresponding to the screen layer, a transmission structure is installed outside the circulation barrel, a push column is provided inside the circulation barrel, the meshing teeth are in transmission connection with the transmission structure, the meshing teeth on the screen layer rotate under the drive structure, and the push column is driven to rise and fall along the height direction of the circulation barrel through the transmission structure;

[0010] Wherein, the crushing box is provided with a secondary crushing cylinder near the inner wall of the circulation barrel, and the secondary crushing cylinder is open downward;

[0011] The side walls at the upper and lower positions of the circulation barrel are respectively provided with a secondary feeding port and a through-feed port. The circulation barrel is connected with the interior of the crushing box through the through-feed port, and is connected with the secondary crushing cylinder through the secondary feeding port.

[0012] After the lime blocks enter the crushing box from the feed port, they are crushed by the large crushing blade and then fall onto the screen. The lime particles that have not passed through the mesh of the screen enter the circulation barrel through the feed port. The push column rises and pushes the lime particles in the circulation barrel into the secondary crushing barrel through the secondary feed port. After being crushed by the secondary crushing barrel, they fall back onto the screen.

[0013] Furthermore, the screen covers the discharge port.

[0014] Furthermore, when the push pin rises to the highest position in the circulation barrel, the pushing end of the push pin is flush with the secondary feeding port;

[0015] When the push pin descends to the lowest position in the circulation barrel, the pushing end of the push pin is located lower than the position of the material passage.

[0016] Furthermore, the push column is provided with rectangular teeth on the side wall facing the transmission structure;

[0017] The transmission structure includes a first gear meshing with the meshing teeth, a threaded shaft coaxially mounted on the first gear, and a second gear mounted on a side of the threaded shaft;

[0018] The second gear meshes with the rectangular teeth;

[0019] The driving structure drives the screen layer to rotate, the screen layer drives the first gear and the threaded shaft to rotate synchronously, the threaded shaft drives the second gear to rotate, and the second gear drives the push column to rise.

[0020] Furthermore, a central shaft is installed at the end of the threaded shaft away from the first gear, and a mainspring is installed at the end of the central shaft away from the threaded shaft;

[0021] The first gear drives the threaded shaft to rotate, and the central shaft rotates synchronously, and the central shaft drives the mainspring to curl;

[0022] When the meshing teeth disengage from the first gear, the mainspring is reset and drives the threaded shaft to rotate in the opposite direction through the central shaft, and the threaded shaft drives the second gear to rotate in the opposite direction, and the second gear drives the push column to descend.

[0023] Furthermore, a small rotating shaft is provided in the secondary crushing cylinder, and a plurality of small crushing blades are installed on the small rotating shaft. One end of the small rotating shaft passes through the crushing box and is connected to the driving structure.

[0024] Furthermore, the driving mechanism includes a driving motor mounted on the end of the large rotating shaft, a small pulley mounted on the small rotating shaft passing through the end of the crushing box, a large pulley mounted on the large rotating shaft passing through the end of the crushing box, and a belt sequentially sleeved on the small pulley and the large pulley;

[0025] The driving motor drives the large rotating shaft to rotate, and the large pulley and the belt rotate synchronously. The belt drives the small pulley to rotate, and the small pulley drives the small rotating shaft and the small crushing blade to rotate.

[0026] Furthermore, a powder storage hopper is installed below the crushing box at the bottom of the discharge port, and the bottom of the powder storage hopper is connected to an air-powder mixing box;

[0027] One side of the air-powder mixing box is connected to an air inlet pipe, the end of the air inlet pipe away from the air-powder mixing box is connected to a fan, the side of the air-powder mixing box away from the air inlet pipe is installed with an air outlet pipe, and the end of the air outlet pipe away from the air-powder mixing box is connected to a coal hopper.

[0028] Furthermore, the air inlet pipe is connected to an exhaust pipe, and a plurality of ventilation interfaces are equidistantly installed on the air outlet pipe, and the exhaust pipe is connected to the ventilation interfaces.

[0029] Furthermore, the bottom of the crushing box is provided with a plurality of fixing ears, each of which is provided with a connecting hole, and the powder storage hopper is provided with a plurality of mounting ears, each of which is provided with a mounting hole, screws are inserted into the connecting holes and the mounting holes, and nuts are threadedly installed on the ends of the screws.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] In the present invention, after the lime blocks enter the crushing box through the feed inlet, they will first be cut and crushed by the large crushing blade, and then fall onto the screen below. The screen will screen the crushed lime blocks, and lime powder smaller than the mesh size of the screen will pass through the screen, while lime particles larger than the mesh size will be screened onto the screen, and then enter the circulation barrel through the feed inlet, and are pushed into the secondary crushing cylinder by the pushing column that reciprocates in the circulation barrel. After the secondary crushing, the lime particles fall onto the screen for re-screening, and the cycle is repeated until all the lime blocks are crushed into lime powder, thereby avoiding the problem that the lime particles are directly put into the coal after the lime blocks are crushed into lime particles, resulting in poor desulfurization effect, and improving the crushing effect of the lime blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] Figure 1 A schematic diagram of the front view of a crushing and conveying device for dry lime desulfurization provided by an embodiment of the present invention;

[0034] Figure 2 Schematic diagram of the overall structure of the screen layer, screen mesh, and meshing teeth in an embodiment of the present invention;

[0035] Figure 3 Schematic diagram of the side structure of the transmission structure, push column, circulation barrel and other components in an embodiment of the present invention;

[0036] Figure 4 This is a front view structural schematic diagram of the push column in an embodiment of the present invention when it rises to the secondary feed inlet.

[0037] The numbers in the figure represent the following:

[0038] 1- Crushing box; 2- Feeding port; 3- Large rotating shaft; 4- Large crushing blade; 5- Screen layer; 6- Screen mesh; 7- Meshing teeth; 8- Transmission structure; 9- Circulation barrel; 10- Push column; 11- Secondary crushing cylinder; 12- Small rotating shaft; 13- Small crushing blade; 14- Feeding port; 15- Secondary feeding port; 16- Rectangular teeth; 17- Driving motor; 18- Small pulley; 19- Large pulley; 20- Belt; 21- Powder storage hopper; 22- Air-powder mixing box; 23- Air inlet pipe; 24- Fan; 25- Upper coal hopper; 26- Exhaust pipe; 27- Ventilation interface; 28- Fixing ear; 29- Mounting ear; 30- Screw; 31- Nut; 32- Scraper; 33- Spring; 34- Transmission box; 35- Valve; 36- Leg; 37- Air outlet pipe; 38- Tilt plate;

[0039] 801-first gear; 802-threaded shaft; 803-second gear; 804-center shaft; 805-spring; 806-rotating bearing; 807-connecting shaft; 808-limit bearing; 809-movable shaft. DETAILED DESCRIPTION

[0040] 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.

[0041] like Figure 1 、 Figure 2 As shown, the present invention provides a crushing and conveying device for dry lime desulfurization, comprising a crushing box 1, a material inlet 2 being provided on the crushing box 1, a large rotating shaft 3 being provided in the crushing box 1, a plurality of large crushing blades 4 being provided on the large rotating shaft 3, one end of the large rotating shaft 3 passing through the crushing box 1 and being connected to a driving structure;

[0042] The crushing box 1 is open on one side away from the feed port 2 and forms a discharge port. The end of the large rotating shaft 3 is connected to a screen layer 5, which is located at the bottom of the discharge port. A screen mesh 6 is provided inside the screen layer 5. The outer periphery of the screen layer 5 is evenly spaced and partially equipped with meshing teeth 7.

[0043] A circulation barrel 9 is installed on the outer wall of the crushing box 1 at a position corresponding to the screen layer 5. A transmission structure 8 is installed outside the circulation barrel 9. A push column 10 is provided inside the circulation barrel 9. The meshing teeth 7 are in transmission connection with the transmission structure 8. The meshing teeth 7 on the screen layer 5 rotate under the drive structure, so as to drive the push column 10 to rise and fall along the height direction of the circulation barrel 9 through the transmission structure 8.

[0044] The crushing box 1 is provided with a secondary crushing cylinder 11 on the inner wall close to the circulation barrel 9, and the secondary crushing cylinder 11 opens downward.

[0045] The side walls of the circulation barrel 9 at the upper and lower positions are respectively provided with a secondary feeding port 15 and a through-feed port 14. The circulation barrel 9 is connected to the interior of the crushing box 1 through the through-feed port 14, and is connected to the secondary crushing cylinder 11 through the secondary feeding port 15.

[0046] After the lime blocks enter the crushing box 1 from the feed port 2, they are crushed by the large crushing blade 4 and then fall onto the screen 6. The lime particles that have not passed through the mesh of the screen 6 enter the circulation barrel 9 through the feed port 14. The push column 10 rises and pushes the lime particles in the circulation barrel 9 into the secondary crushing cylinder 11 through the secondary feed port 15. After being crushed by the secondary crushing cylinder 11, they fall onto the screen 6 again.

[0047] In the present invention, after the lime blocks enter the crushing box 1 through the feed port 2, they will first be cut and crushed by the large crushing blade 4, and then fall onto the screen 6 below. The screen 6 will screen the crushed lime blocks, and the lime powder smaller than the mesh aperture of the screen 6 will pass through the screen 6, while the lime particles larger than the mesh aperture will be screened onto the screen 6, and then enter the circulation barrel 9 through the feed port 14, and are pushed to the secondary crushing cylinder 11 by the push column 10 that reciprocates in the circulation barrel 9. After the secondary crushing, the lime particles fall onto the screen 6 for re-screening, and the cycle is repeated until all the lime blocks are crushed into lime powder, thereby avoiding the problem that the lime particles are directly put into the coal after the lime blocks are crushed into lime particles, resulting in poor desulfurization effect, and improving the crushing effect of the lime blocks.

[0048] If the diameter of the screen 6 is smaller than the diameter of the outlet of the crushing box 1, the lime powder formed after the lime blocks are crushed will be discharged directly from the discharge port together with the lime particles, and the screen 6 will not be able to play a screening role, and the lime particles will not be able to enter the secondary powder barrel 11 for secondary crushing. In order to thoroughly screen the lime powder and lime particles, the screen 6 is covered with the discharge port, and the lime blocks will fall completely onto the screen 6 after being crushed. The screen 6 will screen out the lime particles, and then the push column 10 will push them to the secondary powder barrel 11 for secondary crushing.

[0049] The lime particles formed after the lime blocks are crushed fall evenly onto the screen 6. In order to ensure that all the lime particles enter the circulation barrel 9 through the feeding port 14, a scraper 32 is provided on the inner wall of the crushing box 1 near the feeding port 14. The bottom of the scraper 32 contacts the screen 6. When the screen layer 5 drives the screen 6 to rotate, the scraper 32 intercepts the lime particles along the circumference of the screen 6 to the feeding port 14. As the lime particles gradually accumulate at the feeding port 14, the lime particles will enter the circulation barrel 9 through the feeding port 14.

[0050] After the lime particles enter the circulation barrel 9, they are pushed upward by the push pin 10 to the secondary feeding port 15, and finally enter the secondary crushing cylinder 11 through the secondary feeding port 15. In order to enable the push pin 10 to push the lime particles entering from the feeding port 14 to the secondary feeding port 15 when it rises, when the push pin 10 rises to the highest position in the circulation barrel 9, the pushing end of the push pin 10 is flush with the secondary feeding port 15. When the push pin 10 falls to the lowest position in the circulation barrel 9, the pushing end of the push pin 10 is lower than the position of the feeding port 14. As a result, when the push pin 10 rises, it can pass through the feeding port 14 and push the lime particles entering from the feeding port 14. The lime particles are pushed to the secondary feed port 15. Since the lime particles continuously enter the circulation barrel 9, in order to prevent the lime particles from falling from the bottom of the push column 10 to the bottom of the circulation barrel 9 when the push column 10 pushes the lime particles to the position of the secondary feed port 15, the height of the push column 10 is greater than the height from the through port 14 to the secondary feed port 15, so that when the top of the push column 10 reaches the height of the secondary feed port 15, its bottom is lower than the height of the through port 14. Therefore, the side wall of the push column 10 can block the through port 14, preventing the lime particles from still entering the circulation barrel 9 from the through port 14 when the push column 10 pushes the lime particles up.

[0051] like Figure 3 、 Figure 4 As shown, the screen layer 5 drives the transmission structure 8 to rotate, and the transmission structure 8 drives the push column 10 to rise or fall. In order to be able to drive the push column 10 to rise or fall, the present invention makes the following design for the push column 10 and the transmission structure 8. Specifically, a rectangular tooth 16 is engraved on the side wall of the push column 10 facing the transmission structure 8. The transmission structure 8 includes a first gear 801 meshing with the meshing teeth 7, a threaded shaft 802 coaxially installed on the first gear 801, and a second gear 803 installed on the side of the threaded shaft 802. The second gear 803 is meshed with the rectangular teeth 16. The driving structure drives the screen layer 5 to rotate, and the screen layer 5 drives the first gear 801 and the threaded shaft 802 to rotate synchronously. The threaded shaft 802 drives the second gear 803 to rotate, and the second gear 803 drives the push column 10 to rise.

[0052] However, in actual use, only rotating and cutting in one direction can better crush the lime blocks. In order to better crush the lime blocks, the driving structure can only drive the large crushing blade 4 and the screen layer 5 to rotate clockwise or counterclockwise, so that the screen layer 5 can only drive the first gear 801, the threaded shaft 802, and the second gear 803 to rotate in one direction, resulting in the transmission structure 8 only being able to drive the push post 10 to rise. When the push post 10 descends, the rectangular teeth 16 will drive the second gear 803 to rotate, and the threaded shaft 802 will get stuck in the gear teeth of the second gear 803, hindering the rotation of the second gear 803, and ultimately preventing the push post 10 from descending. In order to ensure that the push post 10 can still descend after the screen layer 5 drives the push post 10 to rise, the present invention makes the following design:

[0053] A central shaft 804 is mounted on the end of the threaded shaft 802 away from the first gear 801 , and a spring 805 is mounted on the end of the central shaft 804 away from the threaded shaft 802 ;

[0054] The first gear 801 drives the threaded shaft 802 to rotate, and the central shaft 804 rotates synchronously, and the central shaft 804 drives the mainspring 805 to curl;

[0055] When the meshing teeth 7 disengage from the first gear 801, the mainspring 805 resets and drives the threaded shaft 802 to rotate in the opposite direction via the central shaft 804. The threaded shaft 802 drives the second gear 803 to rotate in the opposite direction, and the second gear 803 drives the push rod 10 to descend.

[0056] Since the meshing teeth 7 are only installed on a part of the outer periphery of the screen layer 5, the first gear 801 can be driven to rotate only when the meshing teeth 7 turn to the first gear 801 and mesh with the first gear 801. When the meshing teeth 7 turn to a position away from the first gear 801, the spring 805 will immediately release the potential energy stored when following the rotation of the first gear 801 and drive the threaded shaft 802 and the first gear 801 to rotate in the opposite direction. The threaded shaft 802 drives the second gear 802 to rotate in the opposite direction. The reverse rotation of the second gear 802 drives the push column 10 to reset. If the transmission structure 8 drives the push column 10 to rise or fall, the spring 805 rotates in the opposite direction to drive the push column 10 to fall.

[0057] In order to prevent the push column 10 from hitting the bottom of the circulation barrel 9 under the action of its own gravity when it descends, a spring 33 is installed at the bottom of the circulation barrel 9. The end of the spring 33 away from the circulation barrel 9 is connected to the push column 10. Therefore, when the push column 10 moves downward, the spring 33 can buffer part of the gravity of the push column 10, thereby reducing the impact force of the push column 10 on the circulation barrel 9.

[0058] like Figure 3 As shown, the screen layer 5 drives the first gear 801, the second gear 803, the threaded shaft 802 and other components in the transmission structure 8 to rotate, and the transmission structure 8 needs to be fixed to the outer wall of the crushing box 1. In order to enable the transmission structure 8 to be fixed to the outer wall of the crushing box 1, a transmission box 34 is installed at a position where the outer wall of the crushing box 1 is opposite to the screen layer 5, and the first gear 801, the second gear 803, the threaded shaft 802 and other components are installed in the transmission box 34. Specifically, a rotating bearing 806 is installed at the bottom of the inner wall of the transmission box 34, and a connecting shaft 807 is axially installed at the bottom of the first gear 801. The end of the connecting shaft 807 away from the first gear 801 is installed on the rotating bearing 806, and a limiting bearing 808 is installed on the side wall of the transmission box 34. A movable shaft 809 is installed on the side of the second gear 803, and the end of the movable shaft 809 away from the second gear 803 is installed on the limiting bearing 808.

[0059] like Figure 1As shown, since lime particles are smaller than lime blocks, if a large crushing blade 4 is used to crush the lime particles, the lime particles will easily slip between the large crushing blades 4, and the large crushing blade 4 will have difficulty in chopping the lime particles. In order to better crush the lime particles, a small rotating shaft 12 is provided in the secondary crushing cylinder 11, and a number of small crushing blades 13 are installed on the small rotating shaft 12. One end of the small rotating shaft 12 passes through the crushing box 1 and is connected to the driving structure. The small crushing blade 13 has a thinner blade and can better cut and crush the lime particles when rotating.

[0060] In order to better drive the large rotating shaft 3 and the small rotating shaft 12 to rotate at the same time, the driving mechanism includes a driving motor 17 installed at the end of the large rotating shaft 3, a small pulley 18 installed at the end of the small rotating shaft 12 passing through the crushing box 1, a large pulley 19 installed at the end of the large rotating shaft 3 passing through the crushing box 1, and a belt 20 sequentially sleeved on the small pulley 18 and the large pulley 19;

[0061] The driving motor 17 drives the large rotating shaft 3 to rotate, and the large pulley 19 and the belt 20 rotate synchronously. The belt 20 drives the small pulley 18 to rotate, and the small pulley 18 drives the small rotating shaft 12 and the small crushing blade 13 to rotate. The driving motor 17 also drives the large crushing blade 4 and the small crushing blade 13 to rotate, thereby crushing the lime blocks and lime particles at the same time.

[0062] In actual production, due to the limitations of the work site, it is usually necessary to connect the two screw conveyors at the end to convey the lime powder to the upper coal hopper 25. The process is cumbersome, and the lime powder may overflow at the connection between the two conveyors and pollute the work site environment. In order to be able to directly transport the lime powder to the upper coal hopper 25, a powder storage hopper 21 is installed at the bottom of the discharge port below the crushing box 1. The bottom of the powder storage hopper 21 is connected to an air-powder mixing box 22. One side of the air-powder mixing box 22 is connected to an air inlet pipe 23. The end of the air inlet pipe 23 away from the air-powder mixing box 22 is connected to a fan 24. The side of the air-powder mixing box 22 away from the air inlet pipe 23 is installed with an air outlet pipe 37. The end of the air outlet pipe 37 away from the air-powder mixing box 22 is connected to the upper coal hopper 25.

[0063] The powder storage hopper 21 is located at the bottom of the screen 6 and is used to temporarily store the lime powder screened by the screen 6. The lime powder enters the storage hopper 21 and then falls into the air-powder mixing box 22. The fan 24 is started, and the wind generated by the fan 24 enters the air-powder mixing box 22 through the air inlet pipe 23. The lime powder is then blown into the upper coal hopper 25 through the air outlet pipe 37 to mix with the coal.

[0064] If only one air outlet pipe 37 is used to transport lime powder to the upper coal hopper 25, the length of the air outlet pipe 37 will be relatively long, and the lime powder may be blocked in the air outlet pipe 37 during the transportation process. In order to prevent the lime powder from blocking the air outlet pipe 37, an exhaust pipe 26 is connected to the air inlet pipe 23, and several ventilation interfaces 27 are installed at equal intervals on the air outlet pipe 37. The exhaust pipe 26 is connected to the ventilation interface 27. The ventilation interface 27 is installed at different positions of the air outlet pipe 37, which can ventilate different positions of the air outlet pipe 37, thereby better clearing the blocked position.

[0065] When there is no blockage in the air outlet pipe 37, stop blowing air into the exhaust pipe 26 to prevent the exhaust pipe 26 from diverting the wind force in the air inlet pipe 23, which makes it difficult for the wind force blown into the air outlet pipe 37 to pass the lime powder into the upper coal hopper 25. In order to stop ventilation into the exhaust pipe 26, a valve 35 is installed on the exhaust pipe 26.

[0066] In order to fix the crushing box 1 on the ground, a number of vertical legs 36 are installed on the outer wall of the powder storage hopper 21. The powder box 1 is connected to the powder storage hopper 21 and fixed to the ground through the vertical legs 36, and the screen layer 5 needs to be rotatably installed at the bottom of the crushing box 1. In order to prevent the powder storage hopper 21 from hindering the rotation of the screen layer 5, a number of fixing ears 28 are provided at the bottom of the crushing box 1, and connecting holes are provided on the fixing ears 28. The powder storage hopper 21 is provided with a number of mounting ears 29, and mounting holes are provided on the mounting ears 29. Screws 30 are inserted into the connecting holes and the mounting holes, and a nut 31 is threadedly installed on the end of the screw 30. This installation method leaves a gap between the bottom of the crushing box 1 and the powder storage hopper 21, and the screen layer 5 can rotate in the gap.

[0067] The large rotating shaft 3 and the large crushing blade 4 are arranged in the middle of the crushing box 1, which can crush the lime blocks evenly. In order to make the driving motor 17 better drive the large rotating shaft 3 to rotate, the driving motor 17 is set in the middle position of the crushing box 1. In this case, the feeding port 2 can only be set at a position near the edge of the crushing box 1. When the lime blocks enter the crushing box 1 from the feeding port 2, most of them will pass through the edges of the large crushing blade 4, resulting in poor crushing effect of the lime blocks. In order to enable the lime blocks entering from the feeding port 2 to fall to the position near the middle of the large crushing blade 4, an inclined plate 38 is provided below the feeding port 2 in the crushing box 1. The inclined plate 38 is inclined toward the middle position in the powder box 1. When the lime blocks enter the crushing box 1 from the feeding port 2, they will fall into the position near the middle of the large crushing blade 4 under the drainage action of the inclined plate 38, so that the large crushing blade 4 can better crush the lime blocks.

[0068] 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 crushing and conveying device for dry lime desulfurization, characterized in that: The invention comprises a crushing box (1), wherein the crushing box (1) is provided with a material inlet (2), a large rotating shaft (3) is provided in the crushing box (1), a plurality of large crushing blades (4) are provided on the large rotating shaft (3), and one end of the large rotating shaft (3) passes through the crushing box (1) and is connected to a driving structure; The crushing box (1) is opened on one side away from the feed port (2) and forms a discharge port. The end of the large rotating shaft (3) is connected to a screen layer (5). The screen layer (5) is located at the bottom of the discharge port. A screen (6) is provided in the screen layer (5). The outer periphery of the screen layer (5) is evenly spaced and partially equipped with meshing teeth (7). A circulation barrel (9) is installed on the outer wall of the crushing box (1) at a position corresponding to the screen layer (5), a transmission structure (8) is installed outside the circulation barrel (9), a push column (10) is arranged inside the circulation barrel (9), the meshing teeth (7) are in transmission connection with the transmission structure (8), and the meshing teeth (7) on the screen layer (5) rotate under the drive of the drive structure, so as to drive the push column (10) to rise and fall along the height direction of the circulation barrel (9) through the transmission structure (8); Wherein, the crushing box (1) is provided with a secondary crushing cylinder (11) near the inner wall of the circulation barrel (9), and the secondary crushing cylinder (11) opens downward; The side walls at the upper and lower positions of the circulation barrel (9) are respectively provided with a secondary feeding port (15) and a through-feed port (14); the circulation barrel (9) is communicated with the interior of the crushing box (1) through the through-feed port (14), and is communicated with the secondary crushing cylinder (11) through the secondary feeding port (15); The lime blocks enter the crushing box (1) from the feed port (2) and are crushed by the large crushing blade (4) before falling onto the screen (6). The lime particles that have not passed through the mesh of the screen (6) enter the circulation barrel (9) through the feed port (14). The push column (10) rises and pushes the lime particles in the circulation barrel (9) into the secondary crushing drum (11) through the secondary feed port (15). The lime particles are crushed by the secondary crushing drum (11) and fall back onto the screen (6).

2. A crushing and conveying device for dry lime desulfurization according to claim 1, characterized in that: The screen (6) covers the discharge port.

3. A crushing and conveying device for dry lime desulfurization according to claim 1, characterized in that: When the push column (10) rises to the highest position in the circulation barrel (9), the pushing end of the push column (10) is flush with the secondary feed port (15); When the push pin (10) descends to the lowest position in the circulation barrel (9), the position of the pushing end of the push pin (10) is lower than the position of the material passage (14).

4. A crushing and conveying device for dry lime desulfurization according to claim 3, characterized in that: The push column (10) is provided with rectangular teeth (16) on the side wall facing the transmission structure (8); The transmission structure (8) comprises a first gear (801) meshing with the meshing teeth (7), a threaded shaft (802) coaxially mounted on the first gear (801), and a second gear (803) mounted on a side of the threaded shaft (802); The second gear (803) is meshed with the rectangular teeth (16); The driving structure drives the screen layer (5) to rotate, the screen layer (5) drives the first gear (801) and the threaded shaft (802) to rotate synchronously, the threaded shaft (802) drives the second gear (803) to rotate, and the second gear (803) drives the push column (10) to rise.

5. A crushing and conveying device for dry lime desulfurization according to claim 4, characterized in that: A central shaft (804) is installed at the end of the threaded shaft (802) away from the first gear (801), and a spring (805) is installed at the end of the central shaft (804) away from the threaded shaft (802); The first gear (801) drives the threaded shaft (802) to rotate, and the central shaft (804) rotates synchronously therewith, and the central shaft (804) drives the mainspring (805) to curl; When the meshing teeth (7) are disengaged from the first gear (801), the mainspring (805) is reset and drives the threaded shaft (802) to rotate in the opposite direction via the central shaft (804), and the threaded shaft (802) drives the second gear (803) to rotate in the opposite direction, and the second gear (803) drives the push column (10) to descend.

6. A crushing and conveying device for dry lime desulfurization according to claim 1, characterized in that: A small rotating shaft (12) is provided in the secondary crushing cylinder (11), and a plurality of small crushing blades (13) are installed on the small rotating shaft (12). One end of the small rotating shaft (12) passes through the crushing box (1) and is connected to the driving structure.

7. A crushing and conveying device for dry lime desulfurization according to claim 6, characterized in that: The driving mechanism comprises a driving motor (17) mounted on the end of the large rotating shaft (3), a small pulley (18) mounted on the small rotating shaft (12) and passing through the end of the crushing box (1), a large pulley (19) mounted on the large rotating shaft (3) and passing through the end of the crushing box (1), and a belt (20) sequentially sleeved on the small pulley (18) and the large pulley (19); The driving motor (17) drives the large rotating shaft (3) to rotate, and the large pulley (19) and the belt (20) rotate synchronously. The belt (20) drives the small pulley (18) to rotate, and the small pulley (18) drives the small rotating shaft (12) and the small crushing blade (13) to rotate.

8. The crushing and conveying device for dry lime desulfurization according to claim 1, characterized in that: A powder storage hopper (21) is installed below the crushing box (1) and at the bottom of the discharge port, and the bottom of the powder storage hopper (21) is connected to an air-powder mixing box (22); One side of the air-powder mixing box (22) is connected to an air inlet pipe (23), and the end of the air inlet pipe (23) away from the air-powder mixing box (22) is connected to a fan (24). An air outlet pipe (37) is installed on the side of the air-powder mixing box (22) away from the air inlet pipe (23), and the end of the air outlet pipe (37) away from the air-powder mixing box (22) is connected to a coal hopper (25).

9. A crushing and conveying device for dry lime desulfurization according to claim 8, characterized in that: The air inlet pipe (23) is connected to an exhaust pipe (26), and a plurality of ventilation interfaces (27) are equidistantly installed on the air outlet pipe (37), and the exhaust pipe (26) is connected to the ventilation interfaces (27).

10. The crushing and conveying device for dry lime desulfurization according to claim 1, characterized in that: The bottom of the crushing box (1) is provided with a plurality of fixing ears (28), and the fixing ears (28) are provided with connection holes. The powder storage hopper (21) is provided with a plurality of mounting ears (29), and the mounting ears (29) are provided with mounting holes. Screws (30) are inserted into the connection holes and the mounting holes, and nuts (31) are threadedly installed on the ends of the screws (30).

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