Cement production wastewater treatment device

Abstract

The present application belongs to the technical field of sewage treatment, and particularly relates to a cement production sewage treatment device, which comprises a treatment frame body, a reaction box is fixedly connected inside the treatment frame body, a water inlet pipeline for injecting sewage and a feed pipeline for injecting flocculants are fixedly connected to the reaction box, the reaction box is used for gathering fine particles in the sewage to form large flocs, a filter frame body is fixedly connected to a position below the reaction box in the treatment frame body, a water outlet pipeline is fixedly connected to the lower end of the reaction box and used for discharging the sewage from the reaction box into the filter frame body. The driving mechanism is arranged to accurately control three working states (deep into the filter frame body, stretch out of the filter frame body and feeding) of the elastic filter belt: the elastic filter belt is deep into the filter frame body to stably intercept the flocs during filtration; the elastic filter belt is stretched out of the filter frame body during blockage cleaning and floc conveying, and the flocs are conveyed to the outside of the device for centralized collection through the feeding action.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and in particular relates to a wastewater treatment device for cement production. Background Technology

[0002] The cement production process generates a large amount of wastewater during raw material crushing, raw meal grinding, clinker calcination, and cement grinding. This wastewater contains a large amount of suspended cement dust, fine particles, mineral impurities, and other pollutants, characterized by high turbidity and high suspended solids content. Direct discharge of this wastewater will not only cause water pollution but also lead to ecological problems such as soil hardening and vegetation destruction. Therefore, it must undergo strict treatment before it can be reused or discharged.

[0003] Currently, wastewater treatment in cement production often employs a combined process of "flocculation sedimentation + filtration." The flocculation stage involves adding flocculants to the wastewater, causing fine particles to aggregate into large flocs, facilitating subsequent separation. The filtration stage uses filter media such as filter screens and cloths to intercept the flocs and residual particles, achieving water purification. However, existing technologies have the following shortcomings in practical applications:

[0004] 1. Filter media (such as filter screens and filter cloths) are mostly fixed structures with non-adjustable filter pore sizes. They are easily clogged by flocs or fine particles, leading to a rapid decline in filtration efficiency. Frequent shutdowns for cleaning or replacement are required, affecting the continuity of processing.

[0005] 2. The cleaning of filter media mostly relies on manual rinsing or mechanical scraping, which is not thorough in cleaning. It is especially difficult to remove fine cement dust embedded in the filter pores, and the filtration performance will decline significantly after long-term use.

[0006] 3. The lack of an automated working state switching mechanism means that manual intervention is required for switching between filtration and unclogging, floc conveying, and other processes, which is cumbersome and has high maintenance costs. Summary of the Invention

[0007] The purpose of this invention is to address the problems mentioned in the background art by providing a cement production wastewater treatment device that uses the synergistic effect of bending and reverse jet cleaning to clear blockages.

[0008] To achieve the above objectives, the present invention adopts the following technical solutions:

[0009] A cement production wastewater treatment device, comprising:

[0010] The treatment frame has a reaction tank fixedly connected inside. The reaction tank is fixedly connected to an inlet pipe for injecting wastewater and a feed pipe for injecting flocculant. The reaction tank is used to aggregate fine particles in the wastewater into large flocs. A filter frame is fixedly connected inside the treatment frame below the reaction tank. A water supply pipe is fixedly connected to the lower end of the reaction tank for discharging wastewater from the reaction tank into the filter frame.

[0011] A filtration mechanism is used to filter sewage within a filter frame. The filtration mechanism includes fixed plate assemblies fixedly connected to the upper ends of the two side walls of the filter frame. Each fixed plate assembly is rotatably connected to a fixed conveying roller. Each fixed conveying roller has an upper movable conveying roller movably disposed on the side away from the filter frame. Lower movable conveying rollers are movably disposed on both sides below the filter frame. An elastic filter belt is sleeved between the fixed conveying rollers, the upper movable conveying rollers, and the lower movable conveying rollers.

[0012] Preferably, a U-shaped mounting plate is fixedly connected to the upper end of the filter frame, and a limiting mechanism is provided between the U-shaped mounting plate and the filter frame to limit the portion of the elastic filter belt located inside the filter frame. The limiting mechanism includes two symmetrically distributed vertical limiting grooves on the inner walls of the filter frame and the U-shaped mounting plate. A limiting block is slidably connected to the filter frame along the vertical limiting grooves. A guide rod is fixedly connected to the lower end of the limiting block. The guide rod extends through to the bottom of the filter frame and is in a sealed sliding connection with the filter frame. A first spring is provided between the limiting block and the bottom wall of the filter frame.

[0013] Preferably, the U-shaped mounting plate is provided with a driving mechanism for switching the working state of the elastic filter belt. The working state of the elastic filter belt includes: extending into the filter frame, extending out of the filter frame, and feeding the elastic filter belt. The driving mechanism includes an extension plate fixedly connected to the U-shaped mounting plate. A threaded rod is rotatably connected to the lower end of the U-shaped mounting plate. A lifting plate is threadedly connected to the threaded rod. Guide wheels are hinged to both lower ends of the lifting plate via hinge rods. Two first guide rails are fixedly connected to both side walls of the filter frame via connecting rods. A first support block is slidably connected between the two first guide rails in the horizontal direction. A second spring is provided between the portion of the first support block extending into the corresponding first guide rail and the inner wall of the first guide rail. The upper moving conveyor roller is rotatably connected between the two side walls of the first support block. An inclined guide plate is fixedly connected to the upper end of the first support block via a U-shaped frame. The guide wheel contacts and rolls with the inclined guide plate at the corresponding position. A drive shaft is rotatably connected to one of the first guide rails on both sides. A gear set is provided on the drive shaft and the upper moving conveyor roller shaft at the corresponding position.

[0014] Preferably, the guide wheel and the inclined guide plate work together to switch the working state of the elastic filter belt between being inserted into the filter frame and being extended out of the filter frame, and the gear set works to switch the working state of the elastic filter belt between being extended out of the filter frame and being fed into the filter frame.

[0015] Preferably, a first synchronous gear set is provided between the two drive shafts, a drive rod is rotatably connected through the extension plate, a first gear is fixedly connected to the top end of the drive rod, a bevel gear set is provided between the drive rod and the corresponding drive shaft, a rotating rod is rotatably connected to the extension plate, a drive motor for driving the rotating rod is fixedly connected to the lower end of the extension plate, a second gear is fixedly connected to the portion of the threaded rod extending above the U-shaped mounting plate, a first arc-shaped rack, a second arc-shaped rack, and a notched arc-shaped rack are fixedly connected to the rotating rod via a connecting rod, the first arc-shaped rack and the second arc-shaped rack mesh with the two sides of the second gear respectively, and they have the same number of teeth, the notched arc-shaped rack meshes with the first gear, and its notch angle is greater than the sum of the angles of the first arc-shaped rack and the second arc-shaped rack.

[0016] Preferably, the lower end of the U-shaped mounting plate is fixedly connected to two limiting rods, which are slidably connected to the lifting plate.

[0017] Preferably, a collection frame is fixedly connected to the processing frame below the filter frame. A bending mechanism is provided below the filter frame for bending the elastic filter belt to adjust the size of the filter holes. The bending mechanism includes a U-shaped fixing plate fixedly connected to the lower end of the filter frame. A drive rod is rotatably connected between the two side walls of the U-shaped fixing plate. A cam is fixedly connected to the drive rod. A push plate is slidably connected through the lower wall of the U-shaped fixing plate. The top of the push plate contacts and engages with the cam. A top roller is fixedly connected to the part of the push plate extending below the U-shaped fixing plate. Two symmetrically distributed third springs are provided between the top roller and the bottom wall of the U-shaped fixing plate. A second synchronous wheel set is provided between the drive rod and one of the fixed conveying roller shafts. Two second guide rails are fixedly connected to both sides below the collection frame. A second support block is slidably connected between the two second guide rails in the horizontal direction. The lower moving conveying roller is rotatably connected between the two side walls of the second support block. A fourth spring is provided between the part of the second support block extending into the corresponding second guide rail and the inner wall of the second guide rail.

[0018] Preferably, a backflushing mechanism is provided above the collection frame to impact the elastic filter belt from the opposite direction during the bending process of the elastic filter belt. The backflushing mechanism includes two suction boxes fixedly connected to the upper ends of the two side walls of the collection frame. A piston plate is slidably connected inside the suction box. A connecting plate is provided between the piston plate and the corresponding second support block. The second guide rail is fixedly connected to the outer side wall of the corresponding suction box by an L-shaped rod. Two symmetrically distributed exhaust boxes are provided directly above the lower half of the elastic filter belt. The exhaust boxes are fixedly connected to the side wall of the collection frame by a support rod. An air supply pipe is fixedly connected between the exhaust box and the corresponding suction box. An air inlet communicating with the outside is opened on the side wall of the suction box. A one-way valve is provided in both the air supply pipe and the air inlet.

[0019] Compared with existing technologies, the advantages of this cement production wastewater treatment device are:

[0020] 1. This invention pre-treats wastewater by setting up a reaction tank, and adds flocculants to aggregate fine particles into large flocs, laying the foundation for subsequent filtration. The filtration mechanism uses an elastic filter belt as the core filter medium, which can efficiently intercept large flocs. Combined with the structural design of the filter frame, it can achieve rapid separation of wastewater and flocs, significantly improving filtration efficiency and effluent quality.

[0021] 2. This invention precisely controls the three working states of the elastic filter belt (deep in the filter frame, extended out of the filter frame, and feeding) by setting up a drive mechanism: during filtration, the elastic filter belt penetrates the filter frame to stably intercept lint; during unclogging and lint conveying, it extends out of the filter frame and conveys the lint to the outside of the device for centralized collection through a feeding action. The entire process requires no manual intervention, has a high degree of automation, reduces downtime, and ensures continuous processing.

[0022] 3. The present invention sets up a limiting mechanism, in which the limiting block slides along the vertical limiting groove, closely adhering to the upper and lower surfaces of the elastic filter belt, restricting its movement only in the vertical direction, avoiding displacement of the filter position due to sewage impact or belt tension changes, ensuring stable coverage of the filtration area, and improving the floc interception effect.

[0023] 4. This invention incorporates a bending mechanism that uses a cam-driven roller to periodically push the elastic filter belt, causing it to bend back and forth. This dynamically adjusts the size of the filter holes, loosening and dislodging fine particles embedded within them. Simultaneously, a backflushing mechanism uses an exhaust box to blow the loosened particles away from the filter holes. The combined effect of bending and backflushing ensures more thorough cleaning, effectively solving the problem of filter media blockage, extending its service life, and reducing maintenance costs.

[0024] 5. In this invention, power transmission and adaptive adjustment are achieved between various mechanisms through components such as gear sets, synchronous pulley sets, and springs. For example, the gears and racks of the drive mechanism cooperate to achieve precise state transitions, the springs of the bending mechanism ensure stable belt tension, and the one-way valve of the backflushing mechanism ensures directional airflow delivery. The overall structure is compact, with strong functional synergy, stable and reliable operation, and is suitable for the long-term continuous treatment of high-turbidity wastewater from cement production. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0026] Figure 2 This is a cross-sectional structural schematic diagram of the present invention;

[0027] Figure 3 This is a partial structural diagram of the internal structure of the present invention;

[0028] Figure 4 yes Figure 3 Enlarged view of point A in the middle;

[0029] Figure 5 yes Figure 3 Enlarged view of point B in the middle;

[0030] Figure 6 This is a partial cross-sectional view of the filter frame in this invention;

[0031] Figure 7 This is a partial structural diagram of the drive mechanism in this invention;

[0032] Figure 8 This is a partial structural diagram of the bending mechanism in this invention;

[0033] Figure 9 This is a partial structural diagram of the recoil mechanism in this invention.

[0034] In the picture:

[0035] 1. Processing frame; 11. Reaction chamber; 12. Filter frame; 13. Collection frame;

[0036] 2. Filtering mechanism; 21. Fixed plate assembly; 22. Fixed conveyor roller; 23. Upper movable conveyor roller; 24. Lower movable conveyor roller; 25. Elastic filter belt;

[0037] 3. U-shaped mounting plate;

[0038] 4. Limiting mechanism; 41. Vertical limiting groove; 42. Limiting block; 43. Guide rod; 44. First spring;

[0039] 5. Drive mechanism; 51. Extension plate; 52. Threaded rod; 53. Lifting plate; 54. Guide wheel; 55. First guide rail; 56. First support block; 57. Second spring; 58. Inclined guide plate; 59. Drive shaft; 510. Gear set;

[0040] 6. First synchronous pulley set; 61. Transmission rod; 62. First gear; 63. Bevel gear set; 64. Rotating rod; 65. Drive motor; 66. Second gear; 67. First arc-shaped rack; 68. Second arc-shaped rack; 69. Notched arc-shaped rack;

[0041] 7. Bending mechanism; 71. U-shaped fixed plate; 72. Drive rod; 73. Cam; 74. Push plate; 75. Top roller; 76. Third spring; 77. Second synchronous pulley group; 78. Second guide rail; 79. Second support block; 710. Fourth spring;

[0042] 8. Recoil mechanism; 81. Suction box; 82. Piston plate; 83. Connecting plate; 84. Exhaust box; 85. Gas supply pipe. Detailed Implementation

[0043] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention. Example: Refer to Figures 1 to 9 A cement production wastewater treatment device, comprising:

[0044] The treatment frame 1 has a reaction tank 11 fixedly connected inside it. The reaction tank 11 is fixedly connected to an inlet pipe for injecting sewage and a feed pipe for injecting flocculant. The reaction tank 11 is used to aggregate fine particles in sewage into large flocs. The filter frame 12 is fixedly connected inside the treatment frame 1 below the reaction tank 11. The lower end of the reaction tank 11 is fixedly connected to a water supply pipe for discharging sewage from the reaction tank 11 into the filter frame 12.

[0045] Specifically, a drain pipe is fixedly connected to the side wall of the filter frame 12 for discharging the wastewater after the large flocs are removed from the wastewater for subsequent purification treatment.

[0046] The filtration mechanism 2 is used to filter the sewage in the filter frame 12. The filtration mechanism 2 includes fixed plate groups 21 fixedly connected to the upper ends of the two side walls of the filter frame 12. Each fixed plate group 21 is rotatably connected to a fixed conveying roller 22. Each fixed conveying roller 22 has an upper movable conveying roller 23 movably arranged on the side away from the filter frame 12. Lower movable conveying rollers 24 are movably arranged on both sides below the filter frame 12. An elastic filter belt 25 is sleeved between the fixed conveying roller 22, the upper movable conveying roller 23 and the lower movable conveying roller 24.

[0047] After the wastewater enters the filter frame 12, the elastic filter belt 25 acts as the core filter component to intercept and filter the wastewater. The large flocs formed after being processed by the reaction chamber 11 are trapped on the surface of the elastic filter belt 25, and the filtered clean water falls through the filter holes of the elastic filter belt 25 and is finally discharged through the drain pipe on the side wall of the filter frame 12.

[0048] A U-shaped mounting plate 3 is fixedly connected to the upper end of the filter frame 12. A limiting mechanism 4 is provided between the U-shaped mounting plate 3 and the filter frame 12 to limit the portion of the elastic filter belt 25 located inside the filter frame 12. The limiting mechanism 4 includes two symmetrically distributed vertical limiting grooves 41 on the inner walls of the filter frame 12 and the U-shaped mounting plate 3. A limiting block 42 is slidably connected to the filter frame 12 along the vertical limiting grooves 41. A guide rod 43 is fixedly connected to the lower end of the limiting block 42. The guide rod 43 extends through to the bottom of the filter frame 12, and the guide rod 43 and the filter frame 12 are in a sealed sliding connection. A first spring 44 is provided between the limiting block 42 and the inner bottom wall of the filter frame 12.

[0049] When the elastic filter belt 25 is performing filtration, the limiting block 42 slides downward along the vertical limiting groove 41 under the elastic force of the first spring 44. Since the limiting block 42 is in close contact with the upper and lower surfaces of the elastic filter belt 25, it can drive the elastic filter belt 25 to move, so that the elastic filter belt 25 can only move in the vertical direction, and switch between the working state of going into the filter frame 12 and going out of the filter frame 12, so as to prevent the filter position from shifting due to sewage impact or belt tension changes, and ensure the stability of the filtration area.

[0050] The U-shaped mounting plate 3 is equipped with a drive mechanism 5, which is used to switch the working state of the elastic filter belt 25. The working states of the elastic filter belt 25 are: extending into the filter frame 12, extending out of the filter frame 12, and feeding the elastic filter belt 25. The drive mechanism 5 includes an extension plate 51 fixedly connected to the U-shaped mounting plate 3. A threaded rod 52 is rotatably connected to the lower end of the U-shaped mounting plate 3. A lifting plate 53 is threadedly connected to the threaded rod 52. Guide wheels 54 are hinged to the lower ends of both sides of the lifting plate 53 through hinge rods. Two first guide rails 55 are fixedly connected to the two side walls of the filter frame 12 through connecting rods. A first support block 56 is slidably connected between the tracks 55 in the horizontal direction. The first support block 56 extends into the corresponding position of the first guide rail 55 and is provided with a second spring 57 between it and the inner wall of the first guide rail 55. The upper moving conveyor roller 23 is rotatably connected between the two side walls of the first support block 56. The upper end of the first support block 56 is fixedly connected to an inclined guide plate 58 through a U-shaped frame. The guide wheel 54 contacts and rolls with the inclined guide plate 58 at the corresponding position. A drive shaft 59 is rotatably connected to one of the first guide rails 55 on both sides. A gear set 510 is provided on the drive shaft 59 and the roller shaft of the upper moving conveyor roller 23 at the corresponding position.

[0051] The guide wheel 54 and the inclined guide plate 58 work together to switch the working state of the elastic filter belt 25 between being inserted into the filter frame 12 and extending out of the filter frame 12. The gear set 510 is used to switch the working state of the elastic filter belt 25 between extending out of the filter frame 12 and feeding the elastic filter belt 25.

[0052] When the elastic filter belt 25 needs to be switched from the working state of being inserted into the filter frame 12 to the extended state, the threaded rod 52 rotates, causing the lifting plate 53 to move downward. The guide wheel 54 moves downward and rolls along the inclined guide plate 58, pushing the first support block 56 to overcome the elastic force of the second spring 57 and move away from the filter frame 12 along the first guide track 55. The upper moving conveyor roller 23 moves outward synchronously, thereby pulling the elastic filter belt 25 out of the filter frame 12. When resetting is required, the elastic force of the second spring 57 pushes the first support block 56 back, the guide wheel 54 moves upward, and the elastic filter belt 25 re-inserts into the filter frame 12. When the elastic filter belt 25 is in the extended state, the drive shaft 59 drives the upper moving conveyor roller 23 to rotate through the gear set 510, realizing the feeding action of the elastic filter belt 25.

[0053] A first synchronous gear set 6 is provided between the two drive shafts 59. A drive rod 61 is rotatably connected through the extension plate 51. A first gear 62 is fixedly connected to the top of the drive rod 61. A bevel gear set 63 is provided between the drive rod 61 and the corresponding drive shaft 59. A rotating rod 64 is rotatably connected to the extension plate 51. A drive motor 65 for driving the rotating rod 64 is fixedly connected to the lower end of the extension plate 51. A second gear 66 is fixedly connected to the part of the threaded rod 52 that extends above the U-shaped mounting plate 3. A first arc-shaped rack 67, a second arc-shaped rack 68, and a notched arc-shaped rack 69 are fixedly connected to the rotating rod 64 through a connecting rod. The first arc-shaped rack 67 and the second arc-shaped rack 68 mesh with the two sides of the second gear 66 respectively, and they have the same number of teeth. The notched arc-shaped rack 69 meshes with the first gear 62, and its notch angle is greater than the sum of the angles of the first arc-shaped rack 67 and the second arc-shaped rack 68.

[0054] When the drive motor 65 drives the rotating rod 64 to rotate, the first arc-shaped rack 67 first meshes with the second gear 66, driving the threaded rod 52 to rotate in the forward direction, so that the elastic filter belt 25 extends out of the filter frame 12. At this time, the notched arc-shaped rack 69 does not mesh with the first gear 62, and the elastic filter belt 25 is not fed. Then the rotating rod 64 continues to rotate, the first arc-shaped rack 67 disengages from the second gear 66, and the notched arc-shaped rack 69 meshes with the first gear 62. Through the transmission rod 61, bevel gear set 63, transmission shaft 59 and first synchronous pulley set 6, the upper moving conveyor rollers 23 on both sides are driven to rotate, so that the elastic filter belt 25 is fed. Finally, the rotating rod 64 rotates until the second arc-shaped rack 68 meshes with the second gear 66, driving the threaded rod 52 to rotate in the reverse direction, so that the elastic filter belt 25 returns to its original position and goes deep into the filter frame 12. During this process, the notched arc-shaped rack 69 disengages from the first gear 62, the feeding action stops, and one working cycle is completed.

[0055] Specifically, two limiting rods are fixedly connected to the lower end of the U-shaped mounting plate 3. The two limiting rods are slidably connected to the lifting plate 53. The limiting rods guide the lifting movement of the lifting plate 53, preventing it from rotating and deviating under the drive of the threaded rod 52, and ensuring stable contact between the guide wheel 54 and the inclined guide plate 58.

[0056] A collection frame 13 is fixedly connected to the processing frame 1 below the filter frame 12. A bending mechanism 7 is provided below the filter frame 12 to bend the elastic filter belt 25 to adjust the size of its filter holes. The bending mechanism 7 includes a U-shaped fixing plate 71 fixedly connected to the lower end of the filter frame 12. A drive rod 72 is rotatably connected between the two side walls of the U-shaped fixing plate 71. A cam 73 is fixedly connected to the drive rod 72. A push plate 74 is slidably connected through the lower wall of the U-shaped fixing plate 71. The top of the push plate 74 contacts and engages with the cam 73. The part of the push plate 74 extending below the U-shaped fixing plate 71 is fixedly connected to a top plate. Two symmetrically distributed third springs 76 are provided between the moving roller 75, the top moving roller 75 and the bottom wall of the U-shaped fixed plate 71. A second synchronous wheel set 77 is provided between the drive rod 72 and one of the fixed conveying rollers 22. Two second guide rails 78 are fixedly connected to both sides of the lower part of the collecting frame 13. A second support block 79 is slidably connected between the two second guide rails 78 in the horizontal direction. The lower moving conveying roller 24 is rotatably connected between the two side walls of the second support block 79. A fourth spring 710 is provided between the part of the second support block 79 that extends into the corresponding position of the second guide rail 78 and the inner wall of the second guide rail 78.

[0057] During the filtration or feeding process of the elastic filter belt 25, the fixed conveyor roller 22 rotates, driving the drive rod 72 to rotate via the second synchronous pulley set 77. The cam 73 rotates with the drive rod 72 and periodically pushes the push plate 74 downward. The jacking roller 75 moves downward synchronously and then resets under the elastic force of the third spring 76, thereby periodically pushing the lower part of the elastic filter belt 25, causing it to bend back and forth. When the elastic filter belt 25 bends, the size of the filter holes changes, which can loosen and dislodge fine particles (such as cement dust) embedded in the pores. At the same time, the lower moving conveyor roller 24 slides adaptively along the second guide rail 78 via the second support block 79 under the action of the belt bending force, and the fourth spring 710 ensures that the belt always maintains appropriate tension.

[0058] A backflushing mechanism 8 is provided above the collection frame 13 to impact the elastic filter belt 25 from the opposite direction during the bending process of the elastic filter belt 25. The backflushing mechanism 8 includes two suction boxes 81 fixedly connected to the upper ends of the two side walls of the collection frame 13. A piston plate 82 is slidably connected inside the suction box 81. A connecting plate 83 is provided between the piston plate 82 and the corresponding second support block 79. The second guide rail 78 is fixedly connected to the outer side wall of the corresponding suction box 81 by an L-shaped rod. Two symmetrically distributed exhaust boxes 84 are provided directly above the lower half of the elastic filter belt 25. The exhaust boxes 84 are fixedly connected to the side wall of the collection frame 13 by a support rod. An air supply pipe 85 is fixedly connected between the exhaust box 84 and the corresponding suction box 81. An air inlet communicating with the outside is opened on the side wall of the suction box 81. A one-way valve is provided in both the air supply pipe 85 and the air inlet.

[0059] When the elastic filter belt 25 bends, causing the lower moving conveyor roller 24 and the second support block 79 to move, the connecting plate 83 pulls the piston plate 82 to slide inside the suction box 81. When the piston plate 82 moves outward, the one-way valve of the air inlet opens, and outside air enters the suction box 81. When the piston plate 82 moves inward, the one-way valve of the air supply pipe 85 opens, and the air in the suction box 81 is sent to the exhaust box 84 through the air supply pipe 85. Air is then sprayed downward from above the elastic filter belt 25 (opposite to the filtration direction). Combined with the porosity changes caused by the bending of the belt, this further blows away deep-seated clogged particles from the filter holes, significantly improving the cleaning effect.

[0060] Specifically, the upper end of the connecting plate 83 is provided with a triangular smooth plate, which is used to allow the large flocs to slide directly into the collection frame 13 when they fall onto the connecting plate 83 during the process of being scooped out and conveyed by the elastic filter belt 25, so as to avoid obstructing the collection of the large flocs.

[0061] The functional principle of this invention can be explained through the following operational methods:

[0062] I. Wastewater Pretreatment and Flocculation Reaction Stage

[0063] Cement production wastewater first enters reaction tank 11 through the inlet pipe, while flocculant is simultaneously injected into reaction tank 11 through the feed pipe. Inside reaction tank 11, the flocculant mixes thoroughly with the wastewater. Utilizing the adsorption and bridging effects of the flocculant, suspended cement dust, fine particles, and other pollutants in the wastewater are aggregated into structurally stable large flocs. This process significantly reduces the difficulty of subsequent filtration, transforming previously difficult-to-intercept microparticles into effectively filterable flocculent impurities, laying the foundation for subsequent filtration and separation. After the reaction is complete, the wastewater containing the large flocs is discharged into the filter frame 12 below through the water supply pipe at the bottom of reaction tank 11, entering the filtration stage.

[0064] II. Filtration and Separation Stage

[0065] The filter mechanism 2 inside the filter frame 12 is the core execution component of sewage purification. The elastic filter belt 25, which is sleeved between the fixed conveyor roller 22, the upper moving conveyor roller 23 and the lower moving conveyor roller 24, serves as the filter medium to intercept and filter sewage: large flocs in the sewage are trapped on the upper surface of the elastic filter belt 25, while the purified water falls through the filter holes of the elastic filter belt 25 and is finally discharged through the drain pipe on the side wall of the filter frame 12 to enter the subsequent deep treatment stage.

[0066] During this process, the limiting mechanism 4 ensures filtration stability: under the elastic force of the first spring 44, the limiting block 42 closely fits the upper and lower surfaces of the elastic filter belt 25 along the vertical limiting groove 41, restricting the elastic filter belt 25 to move only in the vertical direction, avoiding displacement of the filtration position due to sewage impact or belt tension changes, and ensuring effective coverage of the filtration area.

[0067] III. Flexible Filter Belt State Transition and Impurity Transport Stage

[0068] To achieve alternating filtration and impurity removal, the drive mechanism 5 precisely controls the switching between three working states of the elastic filter belt 25, as follows:

[0069] The filter frame extends to stage 12: the drive motor 65 drives the rotating rod 64 to rotate, and the first arc-shaped rack 67 on the rotating rod 64 meshes with the second gear 66, driving the threaded rod 52 to rotate forward. The threaded rod 52 drives the lifting plate 53 to move downward along the limit rod, and the guide wheel 54 at the lower end of the lifting plate 53 rolls along the inclined guide plate 58, pushing the first support block 56 to overcome the elastic force of the second spring 57 and move along the first guide track 55 away from the filter frame 12. The upper moving conveyor roller 23 moves outward synchronously with the first support block 56, pulling the elastic filter belt 25 to extend out from inside the filter frame 12, so that large lint trapped on the surface can be removed from the filtration area.

[0070] Feeding stage: Rotating rod 64 continues to rotate, the first arc-shaped rack 67 disengages from the second gear 66, and at this time, the notched arc-shaped rack 69 meshes with the first gear 62. Power is transmitted to the transmission shaft 59 via transmission rod 61 and bevel gear set 63, and then drives the two transmission shafts 59 to rotate synchronously through the first synchronous pulley set 6. The transmission shaft 59 drives the upper moving conveyor roller 23 to rotate through gear set 510, realizing the uniform feeding of the elastic filter belt 25, and conveying the large flocs on the surface to the outside of the device for collection.

[0071] Reset Deepening Stage: Rotating rod 64 rotates until the second arc-shaped rack 68 meshes with the second gear 66, driving the threaded rod 52 to rotate in the opposite direction. The lifting plate 53 moves upward, and the guide wheel 54 disengages from the inclined guide plate 58. The first support block 56 moves back under the elastic force of the second spring 57, the upper moving conveyor roller 23 resets, and the elastic filter belt 25 re-enters the filter frame 12, restoring the filtering state. At this time, the notched arc-shaped rack 69 disengages from the first gear 62, the feeding action stops, and one working cycle is completed.

[0072] IV. Dynamic Clearing and Recoil Enhancement Phase

[0073] To address the deep clogging issue of the elastic filter belt 25, the bending mechanism 7 and the backflushing mechanism 8 work together to achieve efficient clogging removal.

[0074] Bending and Unblocking: During the feeding process of the elastic filter belt 25, the rotation of the fixed conveyor roller 22 drives the drive rod 72 to rotate via the second synchronous pulley set 77. The cam 73 on the drive rod 72 periodically pushes the push plate 74 downward. After the push plate 74 moves downward, the jacking roller 75 is reset under the elastic force of the third spring 76, periodically pushing the lower part of the elastic filter belt 25. Under the jacking action, the elastic filter belt 25 reciprocates and bends, and the size of the filter holes changes dynamically with the bending action, causing fine particles such as cement dust embedded in the pores to loosen and fall off due to structural deformation. At the same time, the lower moving conveyor roller 24 slides adaptively within the second guide rail 78 via the second support block 79, and the fourth spring 710 ensures that the elastic filter belt 25 always maintains appropriate tension, avoiding excessive stretching or slack.

[0075] Backwash Enhancement: When the elastic filter belt 25 bends, the lower moving conveyor roller 24 drives the second support block 79 to move along the second guide rail 78, pulling the piston plate 82 to slide back and forth in the suction box 81 via the connecting plate 83. When the piston plate 82 moves outward, the suction box 81 draws in outside air through the one-way valve of the air inlet; when the piston plate 82 moves inward, the air in the suction box 81 is delivered to the exhaust box 84 through the one-way valve of the air supply pipe 85, and is sprayed downward from above the elastic filter belt 25 (opposite to the filtration direction). Combined with the dynamic changes in the filter holes, loose particles are blown away from the pores, significantly improving the unclogging effect. The detached impurities eventually fall into the collection frame 13 below for centralized collection and treatment.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cement production wastewater treatment device, characterized in that, include: The processing frame (1) has a reaction box (11) fixedly connected inside. The reaction box (11) is fixedly connected to an inlet pipe for injecting sewage and a feed pipe for injecting flocculant. The reaction box (11) is used to aggregate small particles in sewage to form large flocs. The processing frame (12) is fixedly connected to the processing frame (1) below the reaction box (11). The lower end of the reaction box (11) is fixedly connected to a water supply pipe for discharging sewage from the reaction box (11) into the filter box (12). The filter mechanism (2) is used to filter the sewage in the filter frame (12). The filter mechanism (2) includes a fixed plate group (21) fixedly connected to the upper end of the two side walls of the filter frame (12). Each fixed plate group (21) is rotatably connected to a fixed conveying roller (22). Each fixed conveying roller (22) is movably provided with an upper moving conveying roller (23) on the side away from the filter frame (12). Lower moving conveying rollers (24) are movably provided on both sides below the filter frame (12). An elastic filter belt (25) is sleeved between the fixed conveying roller (22), the upper moving conveying roller (23) and the lower moving conveying roller (24). The filter frame (12) is fixedly connected to a U-shaped mounting plate (3) at its upper end. A limiting mechanism (4) is provided between the U-shaped mounting plate (3) and the filter frame (12) to limit the portion of the elastic filter belt (25) located inside the filter frame (12). The limiting mechanism (4) includes two symmetrically distributed vertical limiting grooves (41) on the inner walls of the filter frame (12) and the U-shaped mounting plate (3). A limiting block (42) is slidably connected to the filter frame (12) along the vertical limiting groove (41). A guide rod (43) is fixedly connected to the lower end of the limiting block (42). The guide rod (43) extends through to the bottom of the filter frame (12), and the guide rod (43) and the filter frame (12) are in a sealed sliding connection. A first spring (44) is provided between the limiting block (42) and the bottom wall of the filter frame (12). The U-shaped mounting plate (3) is equipped with a drive mechanism (5) for switching the working state of the elastic filter belt (25). The working state of the elastic filter belt (25) is divided into: penetrating the filter frame (12), extending out of the filter frame (12), and feeding the elastic filter belt (25). The drive mechanism (5) includes an extension plate (51) fixedly connected to the U-shaped mounting plate (3). The lower end of the U-shaped mounting plate (3) is rotatably connected to a threaded rod (52). A lifting plate (53) is threadedly connected to the threaded rod (52). The lower ends of both sides of the lifting plate (53) are hinged to guide wheels (54) through hinge rods. Two first guide rails (55) are fixedly connected to both sides of the filter frame (12) through connecting rods. A first support block (56) is slidably connected between a guide rail (55) in the horizontal direction. The first support block (56) extends into the corresponding part of the first guide rail (55) and is provided with a second spring (57) between it and the inner wall of the first guide rail (55). The upper moving conveyor roller (23) is rotatably connected between the two side walls of the first support block (56). The upper end of the first support block (56) is fixedly connected to an inclined guide plate (58) by a U-shaped frame. The guide wheel (54) contacts and rolls with the inclined guide plate (58) at the corresponding position. A drive shaft (59) is rotatably connected to one of the first guide rails (55) on both sides. The drive shaft (59) and the upper moving conveyor roller (23) at the corresponding position are provided with a gear set (510).

2. The cement production wastewater treatment device according to claim 1, characterized in that, The guide wheel (54) and the inclined guide plate (58) work together to switch the working state of the elastic filter belt (25) between being inserted into the filter frame (12) and extending out of the filter frame (12), and the gear set (510) is used to switch the working state of the elastic filter belt (25) between extending out of the filter frame (12) and feeding the elastic filter belt (25).

3. The cement production wastewater treatment device according to claim 2, characterized in that, A first synchronous pulley set (6) is provided between the two drive shafts (59). A drive rod (61) is rotatably connected through the extension plate (51). A first gear (62) is fixedly connected to the top end of the drive rod (61). A bevel gear set (63) is provided between the drive rod (61) and the corresponding drive shaft (59). A rotating rod (64) is rotatably connected to the extension plate (51). A drive motor (65) for driving the rotating rod (64) is fixedly connected to the lower end of the extension plate (51). The threaded rod (52) extends to the U-shaped mounting plate. (3) The upper part is fixedly connected to the second gear (66). The rotating rod (64) is fixedly connected to the first arc-shaped rack (67), the second arc-shaped rack (68) and the notched arc-shaped rack (69) by the connecting rod. The first arc-shaped rack (67) and the second arc-shaped rack (68) mesh with the two sides of the second gear (66) respectively, and the number of teeth on them is the same. The notched arc-shaped rack (69) meshes with the first gear (62), and its notch angle is greater than the sum of the angles of the first arc-shaped rack (67) and the second arc-shaped rack (68).

4. The cement production wastewater treatment device according to claim 1, characterized in that, The lower end of the U-shaped mounting plate (3) is fixedly connected to two limiting rods, which are slidably connected to the lifting plate (53).

5. The cement production wastewater treatment device according to claim 1, characterized in that, A collection frame (13) is fixedly connected to the processing frame (1) below the filter frame (12). A bending mechanism (7) is provided below the filter frame (12) to bend the elastic filter belt (25) to adjust the size of the filter holes. The bending mechanism (7) includes a U-shaped fixing plate (71) fixedly connected to the lower end of the filter frame (12). A drive rod (72) is rotatably connected between the two side walls of the U-shaped fixing plate (71). A cam (73) is fixedly connected to the drive rod (72). A push plate (74) is slidably connected through the lower wall of the U-shaped fixing plate (71). The top of the push plate (74) contacts and cooperates with the cam (73), and the part of the push plate (74) extending below the U-shaped fixing plate (71) is fixed. A top roller (75) is connected to the bottom wall of the U-shaped fixed plate (71), and two symmetrically distributed third springs (76) are provided between the top roller (75) and the bottom wall of the U-shaped fixed plate (71). A second synchronous wheel set (77) is provided between the drive rod (72) and the roller shaft of one of the fixed conveying rollers (22). Two second guide rails (78) are fixedly connected to both sides of the lower part of the collection frame (13). A second support block (79) is slidably connected between the two second guide rails (78) in the horizontal direction. The lower moving conveying roller (24) is rotatably connected between the two side walls of the second support block (79). A fourth spring (710) is provided between the part of the second support block (79) that extends into the corresponding position of the second guide rail (78) and the inner wall of the second guide rail (78).

6. The cement production wastewater treatment device according to claim 5, characterized in that, A backflush mechanism (8) is provided above the collection frame (13) to impact the elastic filter belt (25) from the opposite direction during the bending process of the elastic filter belt (25). The backflush mechanism (8) includes two suction boxes (81) fixedly connected to the upper ends of the two side walls of the collection frame (13). A piston plate (82) is slidably connected inside the suction box (81). A connecting plate (83) is provided between the piston plate (82) and the corresponding second support block (79). The second guide rail (78) passes through... The L-shaped rod is fixedly connected to the outer wall of the corresponding suction box (81). Two symmetrically distributed exhaust boxes (84) are provided directly above the lower half of the elastic filter belt (25). The exhaust boxes (84) are fixedly connected to the side wall of the collection frame (13) by the support rod. An air supply pipe (85) is fixedly connected between the exhaust boxes (84) and the corresponding suction box (81). An air inlet communicating with the outside is opened on the side wall of the suction box (81). A one-way valve is provided in both the air supply pipe (85) and the air inlet.

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