A treatment device and method for domestic sewage

Abstract

The present invention relates to the technical field of sewage treatment devices, and specifically discloses a treatment device and method for domestic sewage, including a pool body, a sand hopper located at the lower end of the pool body, a stirrer arranged in the pool body, a sand discharge head movably assembled up and down in the pool body, a lifting drive member installed above the pool body for driving the sand discharge head to reciprocate up and down, a sand discharge valve installed on the sand discharge pipe, and a trigger installed on the sand hopper for controlling the opening and closing of the sand discharge valve. The pool body is communicated with a water inlet pipe and a drain pipe, and the sand hopper is communicated with a sand discharge pipe; the size of the sand discharge head is adapted to the cross-section of the sand hopper, and it includes a partition board, a filter board spaced apart below the partition board, and an elastic member connected between the partition board and the filter board; the elastic member is used to be compressed when the filter board pushes the sand grains to detect the storage amount of the sand grains. The treatment device and method for domestic sewage can carry out sand discharge under the state where the normal sand sedimentation process continues, realizing continuous sand sedimentation and on-line sand discharge.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment devices, and particularly relates to a treatment device and method for domestic sewage. Background Art

[0002] With the continuous acceleration of the urbanization process, the treatment of domestic sewage has become an important issue concerning the ecological environment and human health. Domestic sewage contains a large amount of organic matter, suspended solids, and various impurities. If directly discharged without treatment, it will cause serious pollution to water bodies, soil, and even the entire ecosystem. In the process of domestic sewage treatment, the vortex grit chamber, as one of the important devices, plays a key role. Through the swirling action of the water flow, heavy particulate matters such as sand grains in the sewage can settle and separate under the action of centrifugal force, thereby effectively removing the sand grain impurities in the sewage, reducing the burden on subsequent treatment processes, and improving the sewage treatment efficiency. And these settled sand grains will eventually accumulate in the sand hopper at the bottom of the vortex grit chamber. The sand hopper, as a temporary storage space for sand grains, the discharge of sand grains therein is equally crucial. If the sand grains cannot be discharged in time, it will not only affect the normal operation of the vortex grit chamber, reduce the grit removal effect, but also may cause the sand hopper to be blocked, thereby triggering a series of equipment failures.

[0003] In the existing vortex grit chambers, such as a vortex grit chamber disclosed in a Chinese patent document with the authorization announcement number CN220265376U, this vortex grit chamber can reduce the probability of sand and gravel staying in the middle of the vortex through an anti-blocking part and a bottom flushing pipe, making the sand and gravel move with the rotation of the vortex water flow to prevent the sand and gravel from caking. The middle flushing pipe impacts the water flow vortex, making the organic matter evenly distributed in the water flow. When discharging the sewage from the grit chamber, the organic matter can be discharged together with the sewage. The bottom flushing pipe can impact the sand and gravel located at the center of the water flow vortex to the water flow vortex, making it move with the water flow vortex, further preventing the sand and gravel at the bottom from caking. The stirring part includes an upper stirring paddle, a middle stirring paddle, and a lower stirring paddle. When the stirring part rotates, it can form a vortex in the grit chamber faster, and the stirring effect of the stirring part on the sand and gravel at the bottom of the grit chamber is better.

[0004] However, when the sand grains at the bottom of the above-mentioned vortex grit chamber in the prior art accumulate to a certain extent, it is necessary to open the sand discharge pipe to discharge the sand grains. During the sand discharge process, it is necessary to pause or reduce the water inflow to avoid the water flow directly flowing out through the opening sand discharge port, which will affect the continuity of the water treatment process and lead to a reduction in the grit removal efficiency. Summary of the Invention

[0005] The present invention provides a treatment device and method for domestic sewage, aiming to solve the problem that when discharging sand in the vortex grit chamber in the related art, it is necessary to pause the normal grit sedimentation process, which will cause the operation of the device to be interrupted and the grit removal efficiency to be reduced.

[0006] A treatment device for domestic sewage provided by the present invention adopts the following technical solutions:

[0007] A treatment device for domestic sewage, comprising a pool body, a sand hopper located at the lower end of the pool body, and a stirrer arranged in the pool body. The pool body is communicated with a water inlet pipe and a drain pipe, and the sand hopper is communicated with a sand discharge pipe. The treatment device for domestic sewage further comprises a sand discharge head movably assembled up and down in the pool body, a lifting driving member installed above the pool body for driving the sand discharge head to reciprocate up and down, a sand discharge valve installed on the sand discharge pipe, and a trigger installed on the sand hopper for controlling the opening and closing of the sand discharge valve;

[0008] The size of the sand discharge head is adapted to the cross-section of the sand hopper, and it comprises a partition plate, a filter plate spaced apart below the partition plate, and an elastic member connected between the partition plate and the filter plate;

[0009] When the sand discharge head moves up to the highest position, there is a material passing gap between the sand discharge head and the sand hopper to allow sand grains to enter the sand hopper. When the sand discharge head moves down to the lowest position, it extends into the sand hopper, so that the partition plate seals between the sand hopper and the pool body, and the filter plate pushes the sand grains in the sand hopper downward to level and compact the sand grains;

[0010] The elastic member is used to compress when the filter plate pushes the sand grains to detect the storage amount of the sand grains. When the compression degree of the elastic member reaches a set value, the trigger opens the sand discharge valve, so that the elastic potential energy stored in the elastic member is released to drive the filter plate to move downward and push the sand grains out.

[0011] By adopting the above technical solutions, through the reciprocating up and down movement of the sand discharge head, during the continuous normal sand sedimentation process, the filter plate can push the sand grains in the sand hopper downward to level and compact the sand grains, while the partition plate seals between the sand hopper and the pool body, effectively isolating the water flow between the pool body and the sand hopper, preventing the water flow in the pool body from entering the sand hopper during the sand discharge process and directly flowing out through the opened sand discharge port, reducing the interference of the water flow on the sand grain discharge, being beneficial to ensuring the smooth discharge of the sand grains and improving the sand discharge efficiency. At the same time, through the isolation of the partition plate, the sand grains in the sand hopper can be prevented from being washed away or resuspended by the water flow during the sand discharge process, ensuring that the sand sedimentation process is not interfered and improving the sand sedimentation efficiency. And the storage amount of the sand grains is detected by the elastic member. When the storage amount of the sand grains reaches a certain value, the trigger automatically opens the sand discharge valve, so that the elastic potential energy stored in the elastic member is released, thereby driving the filter plate to move downward and push the sand grains out. In this way, the sand sedimentation process in the pool body can continue without being affected by the sand discharge operation, thus realizing continuous sand sedimentation and on-line sand discharge, and significantly improving the water treatment efficiency.

[0012] Further, through holes penetrating up and down are formed in the partition plate, and a one-way valve allowing water flow to flow upward is installed at the through holes.

[0013] With the above technical solution, the check valve is provided to maintain the pressure stability on both sides of the isolation plate, so as to reduce the resistance of the water flow to the downward movement of the isolation plate and ensure the smooth downward movement of the isolation plate.

[0014] Furthermore, the output shaft of the lifting driving member has a slot, the upper end of the isolation plate is connected with a sleeve, a clamping block is installed in the sleeve through a plugging spring, and the plugging spring is used to apply an elastic force to the clamping block so that the clamping block is inserted into the slot, thereby connecting the sand discharging head with the output shaft of the lifting driving member;

[0015] The upper end of the filter plate is connected with an inner shaft that penetrates upward into the sleeve, the upper end of the inner shaft has a pushing head, and the pushing head is used to push the clamping block upward so that the clamping block moves out of the slot, thereby disconnecting the sand discharging head from the output shaft of the lifting driving member.

[0016] Furthermore, the lower end of the output shaft has an extending portion, the slot is opened on the extending portion and extends horizontally, the two clamping blocks are symmetrically distributed relative to the central axis of the sleeve, and are driven by the plugging spring to approach each other and are respectively inserted into the slot from both ends of the slot. The lower end of each clamping block has an inclined surface that slopes downward from inside to outside, and the cross-section of the pushing head is an isosceles trapezoid with a smaller upper part and a larger lower part, so as to push against the inclined surfaces at the lower ends of the two clamping blocks to make the two clamping blocks move away from each other.

[0017] Furthermore, the upper end of each clamping block has an inclined surface that slopes downward from outside to inside, and the lower end of the extending portion gradually shrinks, and is used to be inserted downward into the sleeve and push against the inclined surfaces at the upper ends of the two clamping blocks, so that the two clamping blocks move away from each other.

[0018] With the above technical solution, the setting that the lower end of the extending portion gradually shrinks enables the extending portion to push against the inclined surfaces at the upper ends of the two clamping blocks, so that the two clamping blocks move away from each other, and then enables the extending portion to smoothly move downward between the two clamping blocks, so that the sand discharging head and the output shaft of the lifting driving member can be reconnected.

[0019] Furthermore, the trigger includes a moving table that is assembled to move up and down on the sand hopper, a first spring connected between the moving table and the sand hopper, a rack arranged on the moving table, a first gear rotatably installed on the sand hopper and meshing with the rack, a first bevel gear coaxially arranged with the first gear, and a second bevel gear arranged on the sand discharging valve and meshing with the first bevel gear;

[0020] A trigger rod is movably assembled along the radial direction of the partition plate on the upper surface of the partition plate. A return spring is arranged between the partition plate and the trigger rod. The return spring is used to apply an elastic force to the trigger rod to make the trigger rod move inwards. The inner shaft has a receiving groove extending vertically for receiving the trigger rod. When the filter plate approaches the partition plate, the lower groove wall of the receiving groove can push the trigger rod, so that the trigger rod moves outwards and extends onto the moving platform, so that the trigger rod can push the moving platform downwards.

[0021] Further, the inner end of the trigger rod has an inclined surface inclined downwards from inside to outside, and the lower groove wall of the receiving groove is inclined downwards from inside to outside for pushing against the inclined surface of the inner end of the trigger rod upwards to make the trigger rod move outwards.

[0022] Further, a material guiding plate is installed on the inner side wall of the pool body, and the material guiding plate is spirally distributed around the central axis of the pool body.

[0023] Adopting the above technical solution, the material guiding plate is used to guide the sand grains to move downwards through its spiral distribution structure to ensure that the sand grains can settle evenly.

[0024] Further, the drain pipe is located above the water inlet pipe, and a first filter plate is also arranged at the lower end of the drain pipe in the pool body, and a second filter plate is arranged at the connection between the pool body and the drain pipe.

[0025] Adopting the above technical solution, the first filter plate is used to preliminarily filter the domestic sewage after grit removal treatment to intercept impurities with larger particles, and the second filter plate is used to perform secondary filtration on the preliminarily filtered domestic sewage to intercept impurities with smaller particles, so as to reduce the treatment load of the subsequent treatment unit and improve the drainage quality.

[0026] The present invention also provides a treatment method for domestic sewage, including the following steps:

[0027] The first step is grit settlement. Domestic sewage enters the pool body through the water inlet pipe and is discharged through the drain pipe. The stirrer stirs in the pool body to form a swirling water flow, and the sand grains in the domestic sewage settle and separate under the action of centrifugal force.

[0028] The second step is grit compaction. The lifting drive member drives the sand discharging head to reciprocate up and down in the pool body. When the sand discharging head moves up to the highest position, there is a material passing gap between the sand discharging head and the sand hopper. The settled sand grains enter the sand hopper through the material passing gap. When the sand discharging head moves down to the lowest position, it extends into the sand hopper so that the partition plate seals between the sand hopper and the pool body, and the filter plate pushes the sand grains in the sand hopper downwards to level and compact the sand grains.

[0029] Step 3: Sand discharge. When the filter plate pushes the sand grains, the elastic member is compressed. When the compression degree of the elastic member reaches the set value, the trigger opens the sand discharge valve, and the elastic potential energy stored in the elastic member is released, driving the filter plate to move downward. The filter plate pushes the sand grains to be discharged through the sand discharge pipe.

[0030] With the above technical solution, through the reciprocating movement of the sand discharge head up and down, under the condition that the normal sand sedimentation process continues, the filter plate can push the sand grains in the sand hopper downward to level and compact the sand grains. The isolation plate is sealed between the sand hopper and the pool body, effectively isolating the water flow between the pool body and the sand hopper. And the storage amount of the sand grains is detected by the elastic member. When the storage amount of the sand grains reaches a certain value, the trigger automatically opens the sand discharge valve, so that the elastic potential energy stored in the elastic member is released, thereby driving the filter plate to move downward to push the sand grains out. In this way, the sand sedimentation process in the pool body can continue without being affected by the sand discharge operation, thus realizing continuous sand sedimentation and on-line sand discharge, and significantly improving the water treatment efficiency.

[0031] The beneficial effects of a sewage treatment device and method provided by the present invention are as follows: Through the reciprocating movement of the sand discharge head up and down, under the condition that the normal sand sedimentation process continues, the filter plate can push the sand grains in the sand hopper downward to level and compact the sand grains. The isolation plate is sealed between the sand hopper and the pool body, effectively isolating the water flow between the pool body and the sand hopper, avoiding the water flow in the pool body from entering the sand hopper during the sand discharge process and directly flowing out through the sand discharge port that is being opened, reducing the interference of the water flow on the sand grain discharge, which is beneficial to ensuring the smooth discharge of the sand grains and improving the sand discharge efficiency. At the same time, through the isolation of the isolation plate, it is possible to avoid the sand grains in the sand hopper from being washed away or resuspended by the water flow during the sand discharge process, ensuring that the sand sedimentation process is not interfered and improving the sand sedimentation efficiency. And the storage amount of the sand grains is detected by the elastic member. When the storage amount of the sand grains reaches a certain value, the trigger automatically opens the sand discharge valve, so that the elastic potential energy stored in the elastic member is released, thereby driving the filter plate to move downward to push the sand grains out. In this way, the sand sedimentation process in the pool body can continue without being affected by the sand discharge operation, thus realizing continuous sand sedimentation and on-line sand discharge, and significantly improving the water treatment efficiency. Description of the Drawings

[0032] Figure 1 It is a schematic structural diagram of the sewage treatment device for domestic sewage of the present invention.

[0033] Figure 2 It is a schematic structural diagram of the sewage treatment device for domestic sewage of the present invention from another perspective.

[0034] Figure 3 It is a schematic structural diagram of the sand discharge head of the sewage treatment device for domestic sewage of the present invention.

[0035] Figure 4It is a schematic structural diagram of the sand discharge head and the output shaft of the sewage treatment device for domestic sewage of the present invention in a connected state.

[0036] Figure 5 It is a schematic structural diagram of the sand discharge head and the output shaft of the sewage treatment device for domestic sewage of the present invention in a separated state.

[0037] Figure 6 It is a schematic structural diagram of the trigger of the sewage treatment device for domestic sewage of the present invention.

[0038] Figure 7 It is a schematic structural diagram of the trigger of the sewage treatment device for domestic sewage of the present invention from another perspective.

[0039] Reference numerals:

[0040] 10, pool body; 110, water inlet pipe; 120, drain pipe; 20, sand hopper; 210, sand discharge pipe; 30, stirrer; 310, stirring motor; 320, stirring drum; 330, stirring blades; 40, sand discharge head; 410, partition plate; 411, check valve; 420, filter plate; 430, elastic member; 440, sleeve; 441, insertion spring; 442, clamping block; 450, inner shaft; 451, pushing head; 452, receiving groove; 460, trigger rod; 470, return spring; 50, lifting drive member; 510, output shaft; 511, protruding portion; 512, slot; 60, sand discharge valve; 70, trigger; 710, moving table; 720, first spring; 730, rack; 740, first gear; 750, first bevel gear; 760, second bevel gear; 80, material guiding plate; 910, first filter plate; 920, second filter plate. Detailed Description of the Invention

[0041] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0042] As Figures 1 to 7As shown in the figure, an embodiment of the treatment device for domestic sewage according to the present invention includes a pool body 10, a sand hopper 20, a stirrer 30, a sand discharging head 40, a lifting driving member 50, a sand discharging valve 60, and a trigger 70. Among them, the pool body 10 is the main container for treating domestic sewage, which is used to hold domestic sewage and perform sand sedimentation treatment; the sand hopper 20 is located at the lower end of the pool body 10 and communicates with the pool body 10, and is used to collect and store the sedimented sand grains; the stirrer 30 is arranged in the pool body 10 and is used to stir the domestic sewage in the pool body 10 to form a swirling water flow, so as to help the sand grains settle; the sand discharging head 40 is assembled to move up and down in the pool body 10 and can extend downward into the sand hopper 20, and is used to compact and push the sand grains in the sand hopper 20; the lifting driving member 50 is installed above the pool body 10 and is used to drive the sand discharging head 40 to reciprocate up and down; the sand discharging valve 60 is installed on the sand discharging pipe 210 and is used to control the discharge of the sand grains in the sand hopper 20; the trigger 70 is installed on the sand hopper 20 and is used to control the opening and closing of the sand discharging valve 60.

[0043] As Figure 1 and Figure 2 shown in the figure, the pool body 10 is generally cylindrical in shape with a conical bottom, which is convenient for the aggregation and discharge of sand grains. The pool body 10 is connected with a water inlet pipe 110 and a drain pipe 120. The water inlet pipe 110 is used to introduce domestic sewage into the pool body 10, and the drain pipe 120 is located above the water inlet pipe 110 and is used to discharge the domestic sewage after sand sedimentation treatment.

[0044] A guide plate 80 is fixedly installed on the inner side wall of the cylindrical section of the pool body 10. The guide plate 80 is spirally distributed around the central axis of the pool body 10. The guide plate 80 is used to guide the sand grains to move downward through its spiral distribution structure to ensure that the sand grains can settle evenly.

[0045] A first filter plate 910 is also fixedly installed in the pool body 10 at the lower end of the drain pipe 120, and a second filter plate 920 is located at the connection between the pool body 10 and the drain pipe 120. The first filter plate 910 is used to preliminarily filter the domestic sewage after sand sedimentation treatment to intercept larger particle impurities, and the second filter plate 920 is used to perform secondary filtration on the preliminarily filtered domestic sewage to intercept smaller particle impurities, so as to reduce the treatment load of the subsequent treatment unit and improve the drainage quality.

[0046] As Figure 2As shown in the figure, the agitator 30 includes a stirring drum 320 rotatably installed in the tank body 10, a plurality of stirring blades 330 fixed on the stirring drum 320 along the circumferential direction of the stirring drum 320, and a stirring motor 310 installed above the tank body 10 for driving the stirring drum 320 to rotate. The stirring drum 320 is distributed along the central axis of the tank body 10. When the stirring motor 310 drives the stirring drum 320 to rotate, the stirring drum 320 drives the plurality of stirring blades 330 to rotate around the central axis of the tank body 10, and the plurality of stirring blades 330 stir the domestic sewage in the tank body 10 to form a swirling water flow, thereby helping the sand particles to settle.

[0047] As Figure 2 shown, the sand hopper 20 is generally cylindrical as a whole, and a sand discharge pipe 210 is connected to the lower end of the sand hopper 20, and the sand discharge pipe 210 is used to discharge the sand particles in the sand hopper 20.

[0048] As Figure 1 , Figure 2 , Figure 4 and Figure 5 shown, the lifting driving member 50 in the embodiment is a hydraulic cylinder. An output shaft 510 is installed at the output end of the lifting driving member 50. The lower end of the output shaft 510 has an extending portion 511. The lower end of the extending portion 511 gradually tapers. A horizontally extending slot 512 is formed in the extending portion 511, and the slot 512 is used to connect the sand discharge head 40. In other embodiments, the lifting driving member 50 can also be a cylinder or an electric push rod.

[0049] As Figures 2 to 5 shown, the sand discharge head 40 includes a partition plate 410, a filter plate 420 spaced apart below the partition plate 410, an elastic member 430 connected between the partition plate 410 and the filter plate 420, a sleeve 440 provided at the upper end of the partition plate 410, an inner shaft 450 provided at the upper end of the filter plate 420, a trigger rod 460 movably assembled on the upper surface of the partition plate 410 along the radial direction of the partition plate 410, and a return spring 470 connected between the partition plate 410 and the trigger rod 460.

[0050] The sizes of the partition plate 410 and the filter plate 420 are both adapted to the cross-section of the sand hopper 20. The partition plate 410 is used to be sealed between the sand hopper 20 and the tank body 10 during the sand discharging process, effectively isolating the water flow between the tank body 10 and the sand hopper 20, preventing the water flow in the tank body 10 from entering the sand hopper 20 during the sand discharging process and directly flowing out through the opening sand discharging port, reducing the interference of the water flow on the discharge of sand grains, which is beneficial to ensuring the smooth discharge of sand grains and improving the sand discharging efficiency. At the same time, through the isolation function of the partition plate 410, the sand grains in the sand hopper 20 can be prevented from being washed away or resuspended by the water flow during the sand discharging process, ensuring that the sedimentation process is not interfered and improving the sedimentation efficiency. The partition plate 410 is provided with a water passing hole penetrating up and down, and a one-way valve 411 allowing the water flow to flow upward is installed at the water passing hole. The setting of the one-way valve 411 is used to maintain the pressure stability on both sides of the partition plate 410, so as to reduce the resistance of the water flow to the downward movement of the partition plate 410 and ensure the smooth downward movement of the partition plate 410.

[0051] The filter plate 420 is used to push the sand grains in the sand hopper 20 downward to level and compact the sand grains, ensuring that the sand grains are closely arranged, reducing the gaps between the sand grains, and pushing the sand grains downward when the storage amount of the sand grains reaches a certain value to ensure the smooth discharge of the sand grains.

[0052] The elastic member 430 in the embodiment is a spring and is installed between the sleeve 440 and the inner shaft 450. The elastic member 430 is used to be compressed when the filter plate 420 pushes the sand grains to detect the storage amount of the sand grains, and release the elastic potential energy when the sand discharging valve 60 is opened to drive the filter plate 420 to move downward, so that the filter plate 420 can push the sand grains downward for discharge. In other embodiments, the elastic member 430 can also adopt elastic components such as reed pieces, and is not limited thereto.

[0053] The protruding portion 511 can be inserted downward into the sleeve 440. A clamping block 442 is installed in the sleeve 440 through a plugging spring 441. The two clamping blocks 442 are symmetrically distributed with respect to the central axis of the sleeve 440, and approach each other under the drive of the plugging spring 441 and are respectively inserted into the slot 512 from both ends of the slot 512, so as to connect the sand discharging head 40 with the output shaft 510 of the lifting driving member 50. The upper end of each clamping block 442 has an inclined surface inclined downward from outside to inside, and the lower end of each clamping block 442 has an inclined surface inclined downward from inside to outside.

[0054] The inner shaft 450 penetrates upward into the sleeve 440. The upper end of the inner shaft 450 has a pushing head 451. The cross-section of the pushing head 451 is an isosceles trapezoid with a smaller upper part and a larger lower part, which is used to push upward against the inclined surfaces at the lower ends of the two clamping blocks 442 to separate the two clamping blocks 442 from each other, so that the clamping blocks 442 are removed from the slot 512, thereby disconnecting the sand discharging head 40 from the output shaft 510 of the lifting driving member 50.

[0055] In addition, the lower end of the protruding portion 511 is gradually narrowed, so that the protruding portion 511 can push against the inclined surfaces at the upper ends of the two clamping blocks 442 downward, thereby causing the two clamping blocks 442 to move away from each other, and then enabling the protruding portion 511 to smoothly move downward between the two clamping blocks 442, so that the sand discharge head 40 and the output shaft 510 of the lifting driving member 50 can be reconnected.

[0056] As Figure 6 and Figure 7 shown, the trigger 70 includes a moving platform 710 movably assembled up and down on the sand hopper 20, a first spring 720 connected between the moving platform 710 and the sand hopper 20, a rack 730 provided on the moving platform 710, a first gear 740 rotatably mounted on the sand hopper 20 and meshing with the rack 730, a first bevel gear 750 coaxially arranged with the first gear 740, and a second bevel gear 760 provided on the sand discharge valve 60 and meshing with the first bevel gear 750. The first spring 720 is used to apply an elastic force to the moving platform 710 to move the moving platform 710 upward to reset.

[0057] The reset spring 470 is used to apply an elastic force to the trigger rod 460 to move the trigger rod 460 inward. The inner end of the trigger rod 460 has an inclined surface that slopes downward from the inside to the outside. The inner shaft 450 has a receiving groove 452 extending up and down for receiving the trigger rod 460, and the lower groove wall of the receiving groove 452 slopes downward from the inside to the outside.

[0058] It should be noted that as the sand sedimentation process continues, the sand grains stored in the sand hopper 20 gradually increase and are leveled and compacted multiple times by the filter plate 420 during the up and down reciprocating movement of the sand discharge head 40. Each time the sand discharge head 40 moves downward to the lowest position and the filter plate 420 pushes the sand grains, since the storage amount of the sand grains in the sand hopper 20 gradually increases, the downward movement resistance of the filter plate 420 will gradually increase, and the compression degree of the elastic member 430 will also gradually increase. Correspondingly, the filter plate 420 gradually moves upward relative to the isolation plate 410, and the distance between the filter plate 420 and the isolation plate 410 gradually decreases. Until the storage amount of the sand grains reaches a certain value and the compression degree of the elastic member 430 reaches the set value, the distance between the filter plate 420 and the isolation plate 410 decreases to such an extent that the lower groove wall of the receiving groove 452 can push the inclined surface of the inner end of the trigger rod 460, so that the trigger rod 460 moves outward and extends onto the moving platform 710. At this time, driven by the lifting driving member 50, the isolation plate 410 continues to move downward and pushes the moving platform 710 downward through the trigger rod 460. The moving platform 710 drives the rack 730 to move downward. The rack 730 drives the first bevel gear 750 to rotate by meshing with the first gear 740, and the first bevel gear 750 drives the second bevel gear 760 to rotate, so that the second bevel gear 760 drives the sand discharge valve 60 to open.

[0059] An embodiment of the treatment method for domestic sewage according to the present invention includes the following steps:

[0060] First step, sand particle sedimentation. Domestic sewage enters the tank body 10 through the water inlet pipe 110 and is discharged through the drain pipe 120. The stirrer 30 stirs in the tank body 10 to form a swirling water flow, and the sand particles in the domestic sewage settle and separate under the action of centrifugal force.

[0061] Second step, sand particle compaction. The sand discharge head 40 is connected to the output shaft 510 of the lifting driving member 50. The lifting driving member 50 drives the sand discharge head 40 to reciprocate up and down in the tank body 10. When the sand discharge head 40 moves up to the highest position, there is a material passing gap between the sand discharge head 40 and the sand hopper 20, and the settled sand particles enter the sand hopper 20 through the material passing gap; when the sand discharge head 40 moves down to the lowest position, it extends into the sand hopper 20, so that the isolation plate 410 seals between the sand hopper 20 and the tank body 10. The sand sedimentation process above the isolation plate 410 is not disturbed and continues. The filter plate 420 pushes the sand particles in the sand hopper 20 downward to level and compact the sand particles.

[0062] Third step, sand particle storage. As the sand sedimentation process continues, the sand particles stored in the sand hopper 20 gradually increase and are leveled and compacted multiple times by the filter plate 420 during the reciprocating up and down movement of the sand discharge head 40. Until the storage amount of the sand particles reaches a certain value and the compression degree of the elastic member 430 reaches the set value, the distance between the filter plate 420 and the isolation plate 410 decreases to such an extent that the lower groove wall of the receiving groove 452 can push the inclined surface at the inner end of the trigger rod 460, so that the trigger rod 460 moves outward and extends onto the moving table 710. At this time, under the drive of the lifting driving member 50, the isolation plate 410 continues to move down and pushes the moving table 710 to move down through the trigger rod 460. The moving table 710 drives the rack 730 to move down. The rack 730 drives the first bevel gear 750 to rotate through meshing with the first gear 740. The first bevel gear 750 drives the second bevel gear 760 to rotate, so that the second bevel gear 760 drives the sand discharge valve 60 to start rotating and gradually open.

[0063] Fourth step, sand particle discharge. After the isolation plate 410 moves down until the sand discharge valve 60 is fully opened, the distance between the filter plate 420 and the isolation plate 410 decreases to such an extent that the pushing head 451 of the inner shaft 450 pushes the two clamping blocks 442, causing the two clamping blocks 442 to move away from each other, so that the clamping blocks 442 move out of the slot 512, thereby disconnecting the sand discharge head 40 from the output shaft 510 of the lifting driving member 50. Under the drive of the lifting driving member 50, the output shaft 510 moves up and continues to reciprocate up and down. The isolation plate 410 remains in place, and the sand particles gradually discharge from the opened sand discharge port. The elastic potential energy stored in the elastic member 430 is released, driving the filter plate 420 to move down. The filter plate 420 pushes the sand particles to discharge through the sand discharge pipe 210.

[0064] Step 5: Reset. During the process of the filter plate 420 moving downward driven by the elastic member 430, the distance between the filter plate 420 and the isolation plate 410 gradually increases. The trigger rod 460 can extend inward into the receiving groove 452 driven by the reset spring 470, so as to release the limit of the trigger rod 460 on the moving platform 710. The moving platform 710 can move upward and reset driven by the first spring 720, and then drive the sand discharge valve 60 to close. When the output shaft 510 moves downward driven by the lifting drive member 50, the protruding portion 511 pushes against the inclined surfaces at the upper ends of the two latch blocks 442 downward, so that the two latch blocks 442 move away from each other, and then the protruding portion 511 can move downward smoothly between the two latch blocks 442, so that the sand discharge head 40 is reconnected to the output shaft 510 of the lifting drive member 50.

[0065] In this way, in the embodiment of the domestic sewage treatment device and method of the present invention, through the reciprocating up and down movement of the sand discharge head 40, the filter plate 420 can push the sand grains in the sand hopper 20 downward to level and compact the sand grains while the normal sand sedimentation process continues. The isolation plate 410 is sealed between the sand hopper 20 and the pool body 10, effectively isolating the water flow between the pool body 10 and the sand hopper 20, preventing the water flow in the pool body 10 from entering the sand hopper 20 during the sand discharge process and flowing out directly through the sand discharge port that is being opened, reducing the interference of the water flow on the discharge of the sand grains, which is beneficial to ensuring the smooth discharge of the sand grains and improving the sand discharge efficiency. At the same time, through the isolation of the isolation plate 410, the sand grains in the sand hopper 20 can be prevented from being washed away or resuspended by the water flow during the sand discharge process, ensuring that the sand sedimentation process is not interfered and improving the sand sedimentation efficiency. The elastic member 430 is used to detect the storage amount of the sand grains. When the storage amount of the sand grains reaches a certain value, the trigger 70 automatically opens the sand discharge valve 60, so that the elastic potential energy stored in the elastic member 430 is released, thereby driving the filter plate 420 to move downward to push the sand grains out. In this way, the sand sedimentation process in the pool body 10 can continue without being affected by the sand discharge operation, thus realizing continuous sand sedimentation and on-line sand discharge, and significantly improving the water treatment efficiency.

[0066] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A treatment device for domestic sewage, comprising a pool body, a sand hopper located at the lower end of the pool body, and a stirrer arranged in the pool body. The pool body is connected with a water inlet pipe and a drain pipe, and the sand hopper is connected with a sand discharge pipe. Its characteristics are that, It further includes a sand discharging head movably assembled up and down in the pool body, a lifting driving member installed above the pool body for driving the sand discharging head to reciprocate up and down, a sand discharging valve installed on the sand discharging pipe, and a trigger installed on the sand hopper for controlling the opening and closing of the sand discharging valve; The size of the sand discharging head is adapted to the cross-section of the sand hopper, and it includes a partition plate and a filter plate spaced apart below the partition plate; When the sand discharging head moves up to the highest position, there is a feeding gap between the sand discharging head and the sand hopper to allow sand grains to enter the sand hopper. When the sand discharging head moves down to the lowest position, it extends into the sand hopper, so that the partition plate seals between the sand hopper and the pool body, and the filter plate pushes the sand grains in the sand hopper downward to level and compact the sand grains; The upper end of the partition plate is connected with a sleeve, the upper end of the filter plate is connected with an inner shaft that penetrates upward into the sleeve, and an elastic member is connected between the sleeve and the inner shaft for compressing to detect the sand grain storage amount when the filter plate pushes the sand grains; when the compression degree of the elastic member reaches the set value, the trigger opens the sand discharging valve, and the elastic potential energy stored in the elastic member is released to drive the filter plate to move downward to push the sand grains out; The trigger includes a moving table movably assembled up and down on the sand hopper, a first spring connected between the moving table and the sand hopper, a rack arranged on the moving table, a first gear rotatably installed on the sand hopper and meshing with the rack, a first bevel gear coaxially arranged with the first gear, and a second bevel gear arranged on the sand discharging valve and meshing with the first bevel gear; A trigger rod is movably assembled along the radial direction of the partition plate on the upper surface of the partition plate. The inner end of the trigger rod has an inclined surface that slopes downward from inside to outside. A return spring is arranged between the partition plate and the trigger rod for applying an elastic force to the trigger rod to make the trigger rod move inward; the inner shaft has a receiving groove extending up and down for receiving the trigger rod. The lower groove wall of the receiving groove slopes downward from inside to outside for pushing up against the inclined surface of the inner end of the trigger rod to make the trigger rod move outward; When the filter plate approaches the partition plate, the lower groove wall of the receiving groove can push the trigger rod to move outward and extend onto the moving table, so that the trigger rod can push the moving table downward.

2. The treatment device for domestic sewage according to claim 1, its characteristics are that, The partition plate is provided with a water passing hole that penetrates up and down, and a one-way valve allowing water to flow upward is installed at the water passing hole.

3. The treatment device for domestic sewage according to claim 1, its characteristics are that, The output shaft of the lifting driving member has a slot, and a clamping block is installed in the sleeve through a plugging spring. The plugging spring is used to apply an elastic force to the clamping block to make the clamping block insert into the slot, so that the sand discharging head is connected to the output shaft of the lifting driving member; The upper end of the inner shaft has a pushing head for pushing the clamping block upward to make the clamping block move out of the slot, so that the sand discharging head is disengaged from the output shaft of the lifting driving member.

4. The treatment device for domestic sewage according to claim 3, its characteristics are that, The lower end of the output shaft has an extending portion, the slot is opened on the extending portion and extends horizontally. The two clamping blocks are symmetrically distributed relative to the central axis of the sleeve, and are driven by the plugging spring to approach each other and respectively insert into the slot from both ends of the slot. The lower end of each clamping block has an inclined surface that slopes downward from inside to outside. The cross-section of the pushing head is an isosceles trapezoid with a smaller upper part and a larger lower part for pushing up against the inclined surfaces at the lower ends of the two clamping blocks to make the two clamping blocks move away from each other.

5. The treatment device for domestic sewage according to claim 4, its characteristics are that, The upper end of each of the clamping blocks has an inclined surface that slopes downward from the outside to the inside. The lower end of the protruding portion gradually narrows and is used to be inserted downward into the sleeve and push against the inclined surfaces of the upper ends of the two clamping blocks, so that the two clamping blocks move away from each other.

6. The treatment device for domestic sewage according to any one of claims 1 to 5, its characteristics are that, A material guiding plate is installed on the inner side wall of the pool body, and the material guiding plate is spirally distributed around the central axis of the pool body.

7. The treatment device for domestic sewage according to any one of claims 1 to 5, its characteristics are that, The drain pipe is located above the water inlet pipe. A first filter plate is further arranged at the lower end of the drain pipe in the pool body, and a second filter plate is arranged at the connection between the pool body and the drain pipe.

8. A treatment method for domestic sewage, its characteristics are that, Using the treatment device for domestic sewage described in claim 1, the following steps are included: In the first step, sand particle sedimentation: Domestic sewage enters the pool body through the water inlet pipe and is discharged through the drain pipe. The stirrer stirs in the pool body to form a swirling water flow, and the sand particles in the domestic sewage settle and separate under the action of centrifugal force. In the second step, sand particle compaction: The lifting driving member drives the sand discharging head to reciprocate up and down in the pool body. When the sand discharging head moves up to the highest position, there is a material passing gap between the sand discharging head and the sand hopper. The settled sand particles enter the sand hopper through the material passing gap. When the sand discharging head moves down to the lowest position, it extends into the sand hopper so that the isolation plate seals between the sand hopper and the pool body, and the filter plate pushes the sand particles in the sand hopper to move downward to level and compact the sand particles. In the third step, sand particle discharge: When the filter plate pushes the sand particles, the elastic member is compressed. When the compression degree of the elastic member reaches the set value, the trigger opens the sand discharging valve, and the elastic potential energy stored in the elastic member is released to drive the filter plate to move downward, and the filter plate pushes the sand particles to be discharged through the sand discharging pipe.

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