Fly ash screening device

Abstract

The present invention relates to a fly ash screening device, and belongs to the technical field of screening equipment. The present invention comprises a screening box, a discharge box, an auxiliary screen and a main screen, a feeding port is provided at the top of the screening box, a discharge port is provided on the right side box wall of the screening box, a baffle is hinged at the top of the discharge port, a support rod is provided at the bottom end of the baffle, an inclined support plate is provided at the bottom of the discharge port, the discharge box is connected to the right side box wall of the screening box, the auxiliary screen is located in the inner cavity of the screening box, the top end is hinged on the screening box, and the bottom end is suspended in the inner cavity of the screening box, the left end of the main screen is hinged at the bottom end of the auxiliary screen, and the right end rests on the inclined support plate under its own weight, a strip convex ridge is provided at the bottom of the main screen, and the auxiliary screen can swing back and forth within a first angle range to drive the right end of the main screen to slide back and forth on the inclined support plate; the auxiliary screen can also swing upward at a second angle to move the bottom end of the auxiliary screen to the top of the discharge port and block the space below the feeding port. The present invention can effectively improve the overall screening efficiency of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of screening equipment, and in particular to a fly ash screening device. Background Art

[0002] Fly ash is fine particles produced during the combustion process of coal-fired power generation, waste incineration, etc. These particles are mainly composed of ash after coal combustion. Through the rational collection and utilization of fly ash, environmental pollution can be reduced, resource utilization can be improved, and it is of great significance to environmental protection.

[0003] The collected fly ash can be mixed into concrete as a building material to improve the strength of the concrete, or used as filling material for roadbeds to improve the stability and bearing capacity of the roadbed. It can also be used as a soil conditioner to improve soil fertility and has important applications in many fields.

[0004] Different application fields have different requirements for fly ash particle size. For example, when fly ash is used as a concrete admixture, the particle size is usually required to be less than 45μm, while when it is used as a soil conditioner, the particle size is only required to be less than 250μm. Therefore, before fly ash is put into use, it is usually necessary to use a screening device to screen it, and screen out the part with the particle size that meets the requirements from the fly ash raw material for use.

[0005] A screening device in the prior art, such as a titanium alloy powder screening device disclosed in a patent with authorization announcement number CN115156042B, includes a support box, a screening cylinder, a first protective door, a second protective door, a first screening net and a second screening net, etc. A screening cylinder is fixedly connected to the top of the support box, a first protective door is rotatably provided on the front upper side of the screening cylinder, a second protective door is rotatably provided on the front lower side of the screening cylinder to prevent alloy powder from splashing, a first screening net is fixedly connected in the middle of the screening cylinder, a second screening net is slidably provided in the lower part of the screening cylinder, and the mesh openings on the first screening net are larger than the mesh openings on the second screening net.

[0006] During the use of the device, if a large amount of large-particle alloy powder is accumulated on the first screening net and the second screening net, the subsequent screening effect will be deteriorated. In order to avoid affecting the screening effect, the large-particle alloy powder accumulated on the screening net needs to be removed regularly. The process of removing the large-particle alloy powder requires the equipment to be shut down, resulting in the screening process being suspended, affecting the screening efficiency. In addition, the process of removing the large-particle alloy powder also requires manual operation, and the manual operation efficiency is low, which will further extend the equipment downtime and further reduce the screening efficiency. Summary of the invention

[0007] The present invention provides a fly ash screening device to solve the technical problems that the powder grading and screening device in the prior art needs to shut down the device to remove the screened large particles, and the process of removing the large particles requires manual operation, resulting in reduced screening efficiency of the device.

[0008] In order to solve the above problems, the present invention provides a fly ash screening device adopting the following technical solutions:

[0009] A fly ash screening device comprises a screening box, wherein a material inlet is arranged at the top of the screening box, a material outlet is arranged on the right box wall of the screening box, a baffle plate extending forward and backward of a rotating axis is hingedly connected to the top of the material outlet, a support rod is arranged at the bottom of the baffle plate, an inclined support plate inclined upward from left to right is arranged at the bottom of the material outlet, and the baffle plate can be placed on the top of the inclined support plate under its own weight to close the material outlet, and the fly ash screening device also comprises:

[0010] The discharge box is connected to the right wall of the screening box and can be connected to the screening box through the discharge port;

[0011] The auxiliary screen is located in the inner cavity of the screening box, the top end of which is hinged on the screening box around a rotation axis extending forward and backward, and the bottom end is suspended in the inner cavity of the screening box and can be opposite to the middle of the inclined support plate when it droops naturally;

[0012] The main screen has a left end hinged to the bottom end of the auxiliary screen around a rotation axis extending forward and backward, and a right end that can rest against the inclined support plate under its own weight. The bottom of the main screen is provided with a plurality of strip convex ridges spaced from left to right;

[0013] The auxiliary screen can swing back and forth within a first angle range to drive the right end of the main screen to slide back and forth on the inclined support plate; the auxiliary screen can also swing upward at a second angle to move the bottom end of the auxiliary screen to above the discharge port and block the space below the inlet. During the process of the auxiliary screen swinging upward at the second angle, the right end of the main screen is driven to pass over the inclined support plate and the baffle and swing downward into the discharge box; the support rod is used to be pressed on the top surface of the main screen after the right end of the main screen passes over the baffle, so that a gap is formed between the baffle and the main screen for large particles of fly ash to pass through.

[0014] By adopting the above technical scheme, during the screening process, the auxiliary screen swings back and forth within the first angle range, driving the right end of the main screen to slide back and forth on the inclined support plate, and the main screen continuously switches back and forth between tilting from top to bottom toward the lower right and tilting from top to bottom toward the lower left during movement, driving the fly ash falling on the main screen to continuously switch back and forth between sliding from the left side of the main screen to the right side and from the right side of the main screen to the left side, so that the fly ash rolls back and forth above the main screen, and is fully screened. Small particles of fly ash fall through the main screen, and large particles of fly ash remain above the main screen, with a good screening effect.

[0015] When a large number of large particles of fly ash are accumulated on the main screen, in order to avoid affecting the subsequent screening effect, the auxiliary screen is swung upward at a second angle, driving the main screen to pass over the inclined support plate and push the baffle to enter the discharge box. After entering the discharge box, the main screen swings downward to a state of tilting from top to bottom to the lower right, so that large particles of fly ash can slide from the main screen into the discharge box to achieve discharge. The discharge process is automatic, time-saving and efficient. After the main screen passes over the baffle, the support rod at the bottom of the baffle is pressed on the top surface of the main screen, forming a gap between the baffle and the main screen, so that large particles of fly ash can fall through the gap to prevent affecting the discharge.

[0016] When the main screen moves toward the discharge box for discharging, the strip ridges at the bottom of the main screen are scratched by the top of the inclined support plate, causing the main screen to vibrate. During this process, the feed port can continue to feed, and the fly ash falling on the main screen can be continuously screened under the action of vibration, preventing the new fly ash that falls from being carried into the discharge box by the main screen plate and causing waste. In addition, since the auxiliary screen swings upward at a faster speed and takes a shorter time to swing to the second angle, less material falls during this period, and the vibration caused by the scratching of the main screen is sufficient to make the new fly ash that falls on the main screen in this process be screened more cleanly. By discharging in the above manner, the equipment does not need to be shut down during the process of discharging large particles of fly ash, and the equipment remains in working condition. Compared with the prior art, the overall screening efficiency of the equipment can be effectively improved.

[0017] Furthermore, the right end of the main screen is connected to a roller, and the right end of the main screen is pressed onto an inclined support plate through the roller. The top surface of the inclined support plate is provided with a plurality of strip edges extending forward and backward and spaced apart along the inclined direction of the inclined support plate.

[0018] By adopting the above technical solution, a strip edge is provided on the inclined support plate. When the right end of the main screen moves back and forth up and down along the inclined support plate, the main screen can vibrate to enhance the screening effect. The main screen is pressed on the inclined support plate by rollers, so that the main screen moves on the inclined support plate more smoothly and prevents the main screen from being stuck by the strip edge.

[0019] Furthermore, a separator plate is vertically connected to the bottom end of the auxiliary screen, which is located on the side of the auxiliary screen facing the fly ash. The separator plate is provided with a plurality of feeding holes arranged in a front-to-back interval, and the feeding holes are strip-shaped and extend in a direction perpendicular to the auxiliary screen.

[0020] By adopting the above technical solution, during the process of discharging large particles of fly ash, the auxiliary screen swings upward to a second angle. During the swinging process, the angle between the partition plate and the main screen becomes larger. The partition plate moves the fly ash accumulated between the auxiliary screen and the main screen, and can turn the new fly ash on the top of the fly ash accumulated on the main screen during the discharge process to the bottom of the accumulated fly ash, thereby enhancing the screening effect of the newly fallen fly ash, and further avoiding the problem that the newly fallen fly ash cannot be screened cleanly during the discharge process and is discharged into the discharge box with the main screen, causing waste.

[0021] Furthermore, the partition plate is provided with a plurality of grid plate groups arranged at intervals in front and back, each grid plate group corresponds to each feeding hole one by one, the grid plate group includes two grid plates arranged symmetrically in front and back, the grid plates are movably installed in the partition plate in the front and back direction, the grid plate includes a plate body extending in a direction perpendicular to the auxiliary screen and a plurality of grid bars vertically connected to the plate body and arranged at equal intervals along the extension direction of the plate body, the grid bars are located on the side of the plate body facing the other plate body in the grid plate group, during the process of the auxiliary screen swinging upward within the first angle range, the two grid plates in the grid plate group can approach each other so that the grid bars extend into the feeding hole to block the feeding hole, and during the process of the auxiliary screen swinging downward within the first angle range, the two grid plates in the grid plate group can move away from each other so that the grid bars leave the feeding hole to expose the feeding hole.

[0022] By adopting the above technical scheme, when the fly ash raw material contains some agglomerated fly ash, the auxiliary screen swings upward within the first angle range, and the main screen gradually tilts from top to bottom and toward the left. The agglomerated fly ash will roll to the left side of the main screen and fall on the partition plate. At this time, the feeding hole on the partition plate is blocked by the grid bars, and the agglomerated fly ash remains above the partition plate. Then the auxiliary screen swings downward within the first angle range, and the two grid plates in the grid plate group gradually move away from each other to expose the feeding hole. At this time, the agglomerated fly ash can pass through the feeding hole and fall between the partition plate and the main screen. Then the auxiliary screen swings upward again within the first angle range, and the angle between the partition plate and the main screen gradually becomes smaller. The two grid plates in the grid plate group approach each other, and the grid bars can squeeze the agglomerated fly ash between the partition plate and the main screen to crush the agglomerated fly ash. The crushed agglomerated fly ash can be screened normally instead of being directly discharged, thus avoiding waste.

[0023] Furthermore, a trigger plate is elastically installed on the right end of the separator plate for sliding along a direction perpendicular to the auxiliary screen, and the grid plate is elastically installed on the separator plate for sliding front and rear. A sliding slope is provided on the right end of the plate body, and the two sliding slopes on the two plate bodies in the grid plate group are arranged opposite to each other and away from each other in the direction away from the auxiliary screen. A plurality of push plates are provided on the left side of the trigger plate and are spaced apart along the front and back directions. Each push plate is respectively located between two grid plates in each grid plate group, and two push slopes are provided on the left side of the push plate, which are arranged back to back and away from each other in the direction away from the auxiliary screen. The two push slopes are respectively fitted with the two push slopes in the grid plate group, and a push block is provided on the top of the main screen. A driving slope inclined from top to bottom along a direction perpendicular to the main screen and facing away from the separator plate is provided on the left side of the push block. The right end of the trigger plate is elastically pressed on the driving slope, and a guide slope inclined from top to bottom along a direction perpendicular to the main screen and facing away from the separator plate is provided on the right side of the push block.

[0024] By adopting the above technical scheme, when the auxiliary screen swings downward within the first angle range, the angle between the separator plate and the main screen increases, and the pushing block pushes the trigger plate through the driving inclined surface to move the trigger plate toward the auxiliary screen. The trigger plate cooperates with the pushing inclined surface on the grid plate through the pushing inclined surface to push the two grid plates in the grid plate group away from each other, thereby exposing the feeding hole. When the auxiliary screen swings upward within the first angle range, the angle between the separator plate and the main screen decreases. In this process, the two grid plates in the grid plate group are reset under the action of elasticity, and the grid bars extend into the feeding hole to block the feeding hole. The distance between the two grid plates in the grid plate group is adjusted by the cooperation between the trigger plate and the pushing block combined with the movement transformation of the main screen. The structure is ingenious, and there is no need to separately set a driving mechanism for driving the grid plates to move closer or farther away from each other, which can save power costs.

[0025] A guiding slope is provided on the right side of the push block, which can guide the agglomerated fly ash to move above the partition plate. The push block is blocked on the right side of the partition plate, which can block the agglomerated fly ash between the partition plate and the main screen, so that the agglomerated fly ash is squeezed and crushed multiple times, which has a better crushing effect on the agglomerated fly ash.

[0026] Furthermore, a first elastic member is connected to the left box wall of the screening box, and the right end of the first elastic member is connected to a pressure plate. The bottom end of the auxiliary screen can be placed on the pressure plate. The screening box is provided with a first driving assembly, and the first driving assembly includes a cam rotatably installed on the screening box around a rotating axis extending forward and backward. The cam can be pressed on the surface of the auxiliary screen for facing the fly ash, and cooperate with the first elastic member and the pressure plate to push the auxiliary screen to swing back and forth within a first angle range during rotation. The cam can also move in the forward and backward direction to exit the inner cavity of the screening box and disengage from the auxiliary screen when the auxiliary screen needs to rotate upward by a second angle.

[0027] By adopting the above technical solution, the cam cooperates with the pressure plate and the first elastic member to drive the auxiliary screen to swing within the first angle range, and the structure is simple. The cam can move back and forth, and when the auxiliary screen needs to swing upward to the second angle, the cam can exit the inner cavity of the screening box, and will not hinder the upward swing of the auxiliary screen.

[0028] Furthermore, a second elastic member is connected to the top box wall of the screening box, and a push plate is connected to the bottom end of the second elastic member. The push plate can fit with the surface of the auxiliary screen facing the fly ash after the auxiliary screen is swung upward by a second angle. The cam can move in the front-to-back direction into the inner cavity of the screening box after the auxiliary screen is swung upward by a second angle, so as to be supported on the surface of the auxiliary screen facing away from the fly ash, and cooperate with the second elastic member and the push plate to push the auxiliary screen to swing back and forth up and down during the rotation.

[0029] By adopting the above technical solution, after the auxiliary screen swings upward to the second angle, the cam extends into the inner cavity of the screening box and is supported on the surface of the auxiliary screen facing away from the fly ash. At this time, the cam cooperates with the push plate and the second elastic member to drive the auxiliary screen to swing up and down, and the auxiliary screen drives the main screen to move back and forth. Since the bottom surface of the main screen is erected on the top of the inclined support plate at this time, when the main screen moves back and forth, the inclined support plate scratches the strip convex ridges, causing the main screen to vibrate, which can shake off the fly ash stuck on the main screen.

[0030] Furthermore, the screening box is provided with a second driving member, which has a driving output end that can rotate around a rotating axis extending forward and backward. The driving output end of the second driving member is vertically connected to a connecting rod, and the end of the connecting rod facing away from the second driving member is vertically connected to a lever, and the lever is supported on a side of the auxiliary screen that is facing away from the fly ash. The second driving member can drive the connecting rod to swing upward, thereby driving the lever to swing upward to drag the auxiliary screen to swing upward to a second angle.

[0031] Furthermore, a baffle rod is vertically connected to the top of the main screen, and the top end of the baffle rod is used to push the baffle plate, so that a gap is maintained between the baffle plate and the pushing block to form a falling channel for the fly ash to fall.

[0032] By adopting the above technical solution, the baffle rod pushes the baffle plate to form a gap between the baffle plate and the pushing block, thereby preventing the pushing block from blocking the fly ash and affecting its falling.

[0033] The fly ash screening device provided by the present invention has the following beneficial effects: the fly ash can slide back and forth on the main screen, and the screening effect is good. The large particles of fly ash accumulated on the main screen can be discharged while the screening process is in progress. The equipment does not need to be shut down during the discharge process, and the overall screening efficiency of the equipment is higher. The newly fallen fly ash during the discharge process can be effectively screened and will not be discharged completely with the movement of the main screen, thereby reducing waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0035] Figure 1 A front view of a fly ash screening device provided by the present invention after removing the rear side box walls of the screening box and the discharge box;

[0036] Figure 2 for Figure 1 A schematic diagram of the structure enlargement at the center A;

[0037] Figure 3 for Figure 1 A schematic diagram of the structure enlarged at B in the middle;

[0038] Figure 4 A schematic diagram of the three-dimensional structure of a fly ash screening device provided by the present invention after removing the rear side box walls of the screening box and the discharge box;

[0039] Figure 5 A schematic diagram of the state of the main screen in the fly ash screening device provided by the present invention during the swinging of the auxiliary screen within the first angle range Figure 1 ;

[0040] Figure 6 A schematic diagram of the state of the main screen in the fly ash screening device provided by the present invention during the swinging of the auxiliary screen within the first angle range Figure 2 ;

[0041] Figure 7 A schematic diagram of the state of a fly ash screening device during the discharge process provided by the present invention Figure 1 ;

[0042] Figure 8 A schematic diagram of the state of a fly ash screening device during the discharge process provided by the present invention Figure 2 ;

[0043] Fig. 9 A schematic diagram of the state of a fly ash screening device during the discharge process provided by the present invention Figure 3 ;

[0044] Fig.10 A top view of a separator plate in a fly ash screening device provided by the present invention.

[0045] Description of reference numerals:

[0046] 1. Screening box; 101. Discharge port; 2. Discharge box; 3. Inlet port; 4. Baffle; 5. Auxiliary screen; 6. First elastic member; 7. Pressure plate; 8. Main screen; 801. Strip ridge; 802. Strip protrusion; 9. Inclined support plate; 10. Roller; 11. Push block; 111. Vertical plane; 112. Driving inclined plane; 113. Guide inclined plane; 12. Baffle rod; 13. Trigger plate; 14. Material separator; 141. Pressing hole; 142. Feeding hole; 15. Support rod; 16. Pressing plate; 17. Push plate; 18. Grid plate; 181. Plate body; 182. Grid bar; 19. Block; 20. Cam; 21. Second elastic member; 22. Push plate. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0048] The following is one embodiment of a fly ash screening device provided by the present invention:

[0049] like Figure 1-Figure 10 As shown, a fly ash screening device includes a screening box 1, a discharge box 2, an auxiliary screen 5, a main screen 8, a separator plate 14, a grid plate group, a trigger plate 13, a first drive assembly and a second drive member.

[0050] like Figure 1 , Figure 4 As shown, the screening box 1 is placed on a horizontal ground, and a feed port 3 communicating with the inner cavity of the screening box 1 is provided on the top box wall of the screening box 1. A discharge port 101 is provided on the right box wall of the screening box 1, and a baffle 4 whose rotation axis extends in the front-to-back direction is hinged on the top of the discharge port 101, and a support rod 15 is connected to the bottom end of the baffle 4. An inclined support plate 9 tilted upward from left to right is connected to the bottom of the discharge port 101, and a horizontal support plate is connected to the bottom end of the inclined support plate 9. The top end of the inclined support plate 9 extends to the outside of the screening box 1, and a plurality of strip edges extending forward and backward and distributed at equal intervals along the inclined direction of the inclined support plate 9 are provided on the top surface of the inclined support plate 9. The above-mentioned baffle 4 can be erected on the top of the inclined support plate 9 under the action of its own weight, thereby blocking the discharge port 101.

[0051] like Figure 1As shown, the left side of the top box wall of the screening box 1 is connected to a second elastic member 21, which is a compression spring that can be extended in the up-down direction, and the bottom end of the second elastic member 21 is connected to a push plate 22. The left box wall of the screening box 1 is connected to a first elastic member 6, which is a compression spring that can be extended in the left-right direction, and the right end of the first elastic member 6 is connected to a pressure plate 7.

[0052] The discharge box 2 is connected to the right wall of the screening box 1. The bottom end of the discharge box 2 is provided with a discharge port. The discharge box 2 can cover the discharge port 101 and communicate with the inner cavity of the screening box 1 through the discharge port 101. The top end of the above-mentioned inclined support plate 9 extends into the discharge box 2, and the baffle 4 can rotate rightward to enter the discharge box 2. A cross bar extending forward and backward is provided in the discharge box 2, and the cross bar is located above the inclined support plate 9 and on the left side of the baffle 4.

[0053] like Figure 1 , Figure 4 As shown, the top of the auxiliary screen 5 is hinged to the top of the left wall of the screening box 1 along the rotation axis extending forward and backward, and the bottom of the auxiliary screen 5 is suspended in the inner cavity of the screening box 1. The auxiliary screen 5 is provided with fine auxiliary screen holes for screening micron-level fly ash particles. The figure only shows the auxiliary screen holes. The auxiliary screen 5 can be set on the pressure plate 7 under the action of its own weight, and the bottom of the auxiliary screen 5 can be opposite to the middle of the inclined support plate 9 when it is in a naturally drooping state.

[0054] like Figure 1 , Figure 2 As shown, the left end of the main screen 8 is hinged to the bottom end of the auxiliary screen 5 around the rotation axis extending forward and backward, and the right end of the main screen 8 is provided with a roller 10, and the right end of the main screen 8 is placed on the above-mentioned inclined support plate 9 through the roller 10. The main screen 8 is provided with fine main screen holes for screening micron-level fly ash particles, and the figure only shows the main screen holes.

[0055] like Figure 1 , Figure 2 , Figure 3 As shown, the bottom of the main screen 8 is provided with a plurality of strip ridges 801 extending forward and backward, and the plurality of strip ridges 801 are evenly spaced along the length direction of the main screen 8. A section of the left side of the top surface of the main screen 8 is provided with a plurality of strip protrusions 802 extending forward and backward, and the plurality of strip protrusions 802 are evenly spaced along the length direction of the main screen 8.

[0056] like Figure 3As shown, the top of the main screen 8 is also connected to a push block 11, which is located on the left side of the main screen 8 and on the right side of the area where the strip protrusion 802 is provided. The left side of the push block 11 is provided with a driving inclined surface 112 and a vertical plane 111 connected sequentially from top to bottom, the driving inclined surface 112 is inclined from top to bottom along the direction perpendicular to the main screen 8 and back to the auxiliary screen 5, and the vertical plane 111 is perpendicular to the main screen 8. The right side of the main screen 8 is provided with a guide inclined surface 113, which is sequentially connected to the top surface of the main screen 8 and inclined from top to bottom along the direction perpendicular to the main screen 8 and back to the auxiliary screen 5. The area of ​​the push block 11 opposite to the vertical plane 111 is provided with sieve holes with fine arrangement and the axis parallel to the main screen 8. The push block 11 is also connected with a blocking rod 12, which is perpendicular to the main screen 8. The top end of the baffle rod 12 is used to be supported on the baffle plate 4 so that a gap is maintained between the baffle plate 4 and the push block 11 to form a drop channel for the fly ash to fall.

[0057] The material separator 14 is vertically connected to the bottom end of the auxiliary screen 5, and the material separator 14 is located on the side of the auxiliary screen 5 facing the fly ash. Fig.10 As shown, the material separator 14 is provided with a plurality of material passing holes 142 arranged at equal intervals in the front-to-back direction, and the material passing holes 142 are in a strip shape and extend in a direction perpendicular to the auxiliary screen 5. The material separator 14 is also provided with a plurality of material pressing holes 141 arranged at equal intervals in the front-to-back direction, and the material pressing holes 141 are in a strip shape and extend in a direction perpendicular to the auxiliary screen 5, and each material pressing hole 141 is provided with a plurality of material pressing plates 16 arranged at equal intervals along the extension direction of the material pressing hole 141. The plurality of material pressing holes 141 and the plurality of material passing holes 142 are arranged alternately in the front-to-back direction.

[0058] like Fig.10 As shown, there are multiple grid plate groups, all connected to the above-mentioned material separator 14, and each grid plate group corresponds to each material passing hole 142. The grid plate group includes two grid plates 18 arranged symmetrically in front and back. The grid plates 18 are movably installed on the material separator 14 in the front and back directions, and a third elastic member is connected between the grid plates 18 and the material separator 14. The third elastic member is a compression spring that can be extended and retracted in the front and back directions. The third elastic member is used to apply an elastic force to the grid plate 18 toward another grid plate 18 in the grid plate group, so that the two grid plates 18 in the grid plate group are pressed against each other in a natural state. The third elastic member is not shown in the figure. The grid plate 18 includes a plate body 181 extending in a direction perpendicular to the auxiliary screen 5 and a plurality of grid bars 182 vertically connected to the plate body 181 and arranged at equal intervals along the extension direction of the plate body 181. The grid bars 182 are located on the side of the plate body 181 facing the other plate body 181 in the grid plate group. The right end of the plate body 181 is provided with a push inclined surface, and the two push inclined surfaces on the two grid plates 18 in the grid plate group are arranged to face each other and move away from each other in the direction away from the auxiliary screen 5.

[0059] The third elastic member is specifically connected between the plate body 181 and the separator plate 14, and the two grid plates 18 in the grid plate group are specifically pressed against each other through the grid bars 182. When the two grid plates 18 in the grid plate group are pressed against each other, the grid bars 182 in the two grid plates 18 extend into the feed hole 142 to block the feed hole 142, and when the two grid plates 18 in the grid plate group are moved away from each other, the grid bars 182 in the grid plates 18 leave the feed hole 142 to expose the feed hole 142.

[0060] like Fig.10 As shown, the trigger plate 13 is slidably mounted on the right end of the separator plate 14 in a direction perpendicular to the auxiliary screen 5, and a fourth elastic member is connected between the trigger plate 13 and the separator plate 14. The fourth elastic member is a compression spring that can be extended and retracted in a direction perpendicular to the auxiliary screen 5, and the fourth elastic member is not shown in the figure. A plurality of push plates 17 are arranged at equal intervals in the front-to-back direction on the left side of the trigger plate 13, and each push plate 17 corresponds to each grid plate group one by one, and the push plate 17 is located between two grid plates 18 in the corresponding grid plate group. Two push inclined surfaces are arranged back to back and away from each other in the direction away from the auxiliary screen 5 on the left side of the push plate 17, and the two push inclined surfaces are respectively fitted with the two push inclined surfaces in the corresponding grid plate group. When the right end of the main screen 8 is pressed on the inclined support plate 9 and moves back and forth, the trigger plate 13 can be elastically pressed against the driving inclined surface 112 on the above-mentioned push block 11.

[0061] The first driving assembly is installed on the screening box 1, and is used to drive the auxiliary screen 5 to swing back and forth within the first angle range. The first driving assembly includes a first driving motor and a cam 20. The first driving motor and the cam 20 can be installed on the screening box 1 in a movable manner along the front and rear directions. The specific installation method is: the top of the front side box wall of the screening box 1 is provided with a through hole that penetrates front and back, and a block 19 is slidably penetrated in the through hole. The first driving motor is fixedly installed on the block 19, and the cam 20 is connected to the output shaft end of the first driving motor to stop rotation. The outer side of the screening box 1 is connected to a push cylinder, and the push cylinder has a piston rod end that can move forward and backward. The block 19 is connected to the piston rod end of the push cylinder. The push cylinder pushes the block 19 to move forward and backward, thereby driving the cam 20 and the first driving motor to move forward and backward.

[0062] The second driving member adopts a second driving motor, and the second driving motor is fixedly mounted on the screening box 1. The second driving motor has an output shaft with an axis extending in the front-to-back direction. The output shaft end of the second driving motor is vertically connected with a connecting rod. The shifting rod extends in the front-to-back direction and is connected to an end of the connecting rod facing away from the second driving motor. The shifting rod is located on the side of the auxiliary screen 5 facing away from the fly ash. When the second driving motor drives the connecting rod to swing upward, it drives the shifting rod to swing upward. The shifting rod shifts the auxiliary screen 5 to swing upward. The structure of the second driving motor, the connecting rod and the shifting rod is not shown in the figure.

[0063] When the present invention is used, the state of the device in the initial state is as follows Figure 1 , Figure 4 As shown, the auxiliary screen 5 is mounted on the pressure plate 7, the cam 20 extends into the inner cavity of the screening box 1 and is pressed on the side of the auxiliary screen 5 facing the fly ash, the right end of the main screen 8 is mounted on the upper surface of the inclined support plate 9, and the baffle 4 is mounted on the top of the inclined support plate 9 to block the discharge port 101. At this time, fly ash raw materials are fed into the screening box 1 from the feed port 3, and the fed fly ash falls on the main screen 8. Start the first drive motor, and the first drive motor drives the cam 20 to rotate. The cam 20 cooperates with the first elastic member 6 and the pressure plate 7 to drive the auxiliary screen 5 to swing back and forth within the first angle range. During the swinging process, the right end of the main screen 8 is driven to move back and forth up and down on the upper surface of the inclined support plate 9. The main screen 8 is scratched by the strip edges on the inclined support plate 9 to produce vibrations. The main screen 8 continuously switches back and forth between tilting from top to bottom to the left and tilting from top to bottom to the right. These two states are shown in FIG. Figure 5 , Figure 6 As shown, the fly ash falling on the main screen 8 is driven to continuously switch back and forth between sliding toward the lower left and sliding toward the lower right, thereby screening the fly ash. Small particles of fly ash pass through the holes of the main screen and fall below the main screen 8, while large particles of fly ash remain above the main screen 8.

[0064] During the screening process, there will be some agglomerated materials in the fly ash. When the right end of the main screen 8 moves to the top of the inclined support plate 9, the main screen 8 tilts from top to bottom and to the left, and the agglomerated materials roll to the left and pass through the guiding inclined surface 113 on the pushing block 11 to roll above the partition plate 14. Then the auxiliary screen 5 swings downward, driving the right end of the main screen 8 to move downward on the inclined support plate 9. During the movement, the angle between the auxiliary screen 5 and the main screen 8 gradually increases, and the main screen 8 gradually rotates back to the partition plate 14. During this process, the driving inclined surface 112 on the pushing block 11 pushes the trigger plate 13 to move toward the auxiliary screen 5. The trigger plate 13 pushes the two grid plates 18 in the grid plate group away from each other through the cooperation between the pushing inclined surface and the pushing inclined surface in the grid plate group, so that the passing hole 142 is exposed, and the agglomerated material falls into between the partition plate 14 and the main screen 8 through the feed hole 142, and then the auxiliary screen 5 swings upward again, and during the swinging process, it drives the right end of the main screen 8 to move toward the top of the inclined support plate 9, and the angle between the partition plate 14 and the main screen 8 gradually decreases, and the trigger plate 13 gradually resets to make the two grid plates 18 in the grid plate group approach each other, and the grid bars 182 in the grid plates 18 abut against each other and pass through the feed hole 142 to block the feed hole 142. As the partition plate 14 and the main screen 8 approach each other, the grid bars 182 and the pressure plate 16 are pressed on the agglomerated material to break the agglomerated material, and the auxiliary screen 5 swings back and forth within the first angle range, and the agglomerated material is continuously broken and gradually loosened, so that normal screening can be carried out.

[0065] After the screening process has been carried out for a period of time, a large amount of large-particle fly ash is accumulated on the main screen 8. A large amount of large-particle fly ash is blocked above the main screen 8, which will affect the subsequent screening effect. It is necessary to remove these accumulated large-particle fly ash. At this time, start the push cylinder to drive the cam 20 to leave the inner cavity of the screening box 1. During this process, the block 19 does not separate from the through hole, and the through hole is always blocked to prevent fly ash from escaping from the through hole to the outside of the screening box 1.

[0066] Then the second driving motor is started, and the lever drives the auxiliary screen 5 to swing upward to a second angle, and during the swinging process, the right end of the main screen 8 is driven to pass over the inclined support plate 9 and push the baffle 4 to penetrate into the discharge box 2. In this process, the top of the inclined support plate 9 scrapes the main screen 8 through the strip protrusion 802 at the bottom of the main screen 8, causing the main screen 8 to vibrate, so that the new fly ash falling from the inlet 3 can be kept in the screening state. At the same time, since the right end of the main screen 8 gradually swings downward after entering the discharge box 2, the angle between the partition plate 14 and the main screen 8 gradually increases, and the partition plate 14 moves the fly ash accumulated on the main screen 8, so that the new fly ash falling during this period can be stirred to the lower layer, and it is easier to screen out the small particles of fly ash in the newly fallen fly ash.

[0067] like Figure 7 , Figure 8 , Fig. 9 As shown, the main screen 8 gradually tilts from top to bottom and toward the right in the discharge box 2 after pushing the baffle 4 open. After the baffle 4 is pushed open, the support rod 15 at its bottom end is pressed above the main screen 8, so that a gap is formed between the main screen 8 and the baffle 4, so that large particles of fly ash on the main screen 8 can fall through the gap, and the baffle 4 will not push the fly ash on the main screen 8 upward, and the fly ash will not be pushed back by the baffle 4.

[0068] After the auxiliary screen 5 swings upward to the second angle, the bottom end of the auxiliary screen 5 moves to above the discharge port 101 and is blocked on the right wall of the screening box 1, blocking the space below the feed port 3 to prevent the fly ash entering from the feed port 3 from being directly discharged from the discharge port 101.

[0069] When the main screen 8 needs to be cleaned, the feeding can be paused, and the push cylinder can be driven to push the cam 20 into the screening box 1. The cam 20 is pressed on the side of the auxiliary screen 5 facing away from the fly ash, and the first drive motor is started to drive the cam 20 to rotate. The cam 20 cooperates with the second elastic member 21 and the push plate 22 to keep the main screen 8 in this position and swing up and down in a small range. During the swinging process, the main screen 8 is driven to move back and forth in the discharge box 2, and the top of the inclined support plate 9 repeatedly scratches the main screen 8 through the strip convex ridge 801, so that the main screen 8 vibrates, and the fly ash stuck in the main screen holes in the main screen 8 is shaken off.

[0070] The present invention can discharge large-particle fly ash without stopping the machine, and the process of discharging large-particle fly ash is automatically performed, which takes less time and can effectively improve the overall screening efficiency of the equipment.

[0071] In this embodiment, the first drive component includes a first drive motor and a cam 20. The cam 20 pushes the auxiliary screen 5 provided on the pressure plate 7 to realize the swing of the auxiliary screen 5 within the first angle range. In other embodiments, the first drive component includes a first drive motor and a rocker arm. At this time, the output shaft of the first drive motor extends in the up and down directions, and the rocker arm extends in the horizontal direction. One end of the rocker arm is connected to the output shaft of the first drive motor in a fixed manner. The first drive motor drives the rocker arm to rotate. During the rotation of the rocker arm, the auxiliary screen 5 can be pushed, so that the auxiliary screen 5 swings back and forth within the first angle range.

[0072] In this embodiment, strip edges are provided on the top surface of the inclined support plate 9. In other embodiments, no strip edges are provided on the top surface of the inclined support plate 9. In this case, the screening effect of the main screen 8 is relatively weak.

Claims

1. A fly ash screening device, comprising a screening box, the top of which is provided with a feed inlet, characterized in that: A discharge port is provided on the right wall of the screening box, a baffle extending forward and backward of the rotation axis is hinged on the top of the discharge port, a support rod is provided at the bottom of the baffle, and an inclined support plate inclined upward from left to right is provided at the bottom of the discharge port. The baffle can be placed on the top of the inclined support plate under its own weight to close the discharge port. The fly ash screening device also includes: The discharge box is connected to the right wall of the screening box and can be connected to the screening box through the discharge port; The auxiliary screen is located in the inner cavity of the screening box, the top end of which is hinged on the screening box around a rotation axis extending forward and backward, and the bottom end is suspended in the inner cavity of the screening box and can be opposite to the middle of the inclined support plate when it droops naturally; The main screen has a left end hinged to the bottom end of the auxiliary screen around a rotation axis extending forward and backward, and a right end that can rest against the inclined support plate under its own weight. The bottom of the main screen is provided with a plurality of strip convex ridges spaced from left to right; The right end of the main screen is connected to a roller, and the right end of the main screen is pressed on the inclined support plate through the roller. The top surface of the inclined support plate is provided with a plurality of strip edges extending forward and backward and spaced apart along the inclined direction of the inclined support plate; The bottom end of the auxiliary screen is vertically connected with a material separator, which is located on the side of the auxiliary screen facing the fly ash, and is provided with a plurality of material holes arranged at intervals in front and back, and the material holes are strip-shaped and extend in a direction perpendicular to the auxiliary screen; The auxiliary screen can swing back and forth within a first angle range to drive the right end of the main screen to slide back and forth on the inclined support plate; the auxiliary screen can also swing upward at a second angle to move the bottom end of the auxiliary screen to above the discharge port and block the space below the inlet. During the process of the auxiliary screen swinging upward at the second angle, the right end of the main screen is driven to pass over the inclined support plate and the baffle and swing downward into the discharge box; the support rod is used to be pressed on the top surface of the main screen after the right end of the main screen passes over the baffle, so that a gap is formed between the baffle and the main screen for large particles of fly ash to pass through.

2. A fly ash screening device according to claim 1, characterized in that: The partition plate is provided with a plurality of grid plate groups arranged in a front-to-back interval, each grid plate group corresponds to each feeding hole one by one, the grid plate group includes two grid plates arranged symmetrically in the front-to-back direction, the grid plates are movably installed in the partition plate in the front-to-back direction, the grid plates include a plate body extending in a direction perpendicular to the auxiliary screen and a plurality of grid bars vertically connected to the plate body and arranged at equal intervals along the extension direction of the plate body, the grid bars are located on a side of the plate body facing the other plate body in the grid plate group, during the process of the auxiliary screen swinging upward within the first angle range, the two grid plates in the grid plate group can approach each other so that the grid bars extend into the feeding hole to block the feeding hole, and during the process of the auxiliary screen swinging downward within the first angle range, the two grid plates in the grid plate group can move away from each other so that the grid bars leave the feeding hole to expose the feeding hole.

3. A fly ash screening device according to claim 2, characterized in that: A trigger plate is elastically installed on the right end of the separator plate for sliding along a direction perpendicular to the auxiliary screen, and the grid plate is elastically installed on the separator plate for sliding front and back. A sliding slope is provided on the right end of the plate body, and the two sliding slopes on the two plate bodies in the grid plate group are arranged opposite to each other and away from each other in the direction back to the auxiliary screen. A plurality of push plates are arranged at intervals along the front and back directions on the left side of the trigger plate, and each push plate is respectively located between two grid plates in each grid plate group. Two push slopes are arranged back to back and away from each other in the direction back to the auxiliary screen on the left side of the push plate, and the two push slopes are respectively fitted with the two push slopes in the grid plate group. A push block is provided on the top of the main screen, and a driving slope inclined from top to bottom along a direction perpendicular to the main screen and back to the separator is provided on the left side of the push block. The right end of the trigger plate is elastically pressed on the driving slope, and a guide slope inclined from top to bottom along a direction perpendicular to the main screen and back to the separator is provided on the right side of the push block.

4. A fly ash screening device according to any one of claims 1 to 3, characterized in that: A first elastic member is connected to the left box wall of the screening box, and the right end of the first elastic member is connected to a pressure plate. The bottom end of the auxiliary screen can be placed on the pressure plate. The screening box is provided with a first driving assembly, and the first driving assembly includes a cam rotatably installed on the screening box around a rotating axis extending forward and backward. The cam can be pressed on the surface of the auxiliary screen facing the fly ash, and cooperate with the first elastic member and the pressure plate to push the auxiliary screen to swing back and forth within a first angle range during rotation. The cam can also move in the forward and backward direction to exit the inner cavity of the screening box and disengage from the auxiliary screen when the auxiliary screen needs to rotate upward by a second angle.

5. A fly ash screening device according to claim 4, characterized in that: A second elastic member is connected to the top box wall of the screening box, and a push plate is connected to the bottom end of the second elastic member. The push plate can fit with the surface of the auxiliary screen facing the fly ash after the auxiliary screen swings upward at a second angle. The cam can move in the front-to-back direction into the inner cavity of the screening box after the auxiliary screen swings upward at a second angle, so as to be supported on the surface of the auxiliary screen facing away from the fly ash, and cooperate with the second elastic member and the push plate to push the auxiliary screen to swing back and forth up and down during the rotation.

6. A fly ash screening device according to any one of claims 1 to 3, characterized in that: The screening box is provided with a second driving member, which has a driving output end that can rotate around a rotating axis extending forward and backward. The driving output end of the second driving member is vertically connected to a connecting rod, and the end of the connecting rod facing away from the second driving member is vertically connected to a shifting rod, and the shifting rod is supported on a side of the auxiliary screen that faces away from the fly ash. The second driving member can drive the connecting rod to swing upward, thereby driving the shifting rod to swing upward to drag the auxiliary screen to swing upward by a second angle.

7. A fly ash screening device according to claim 3, characterized in that: A baffle rod is vertically connected to the top of the main screen, and the top end of the baffle rod is used to push the baffle plate, so that the baffle plate and the pushing block are spaced apart to form a falling channel for the fly ash to fall.

Images