Treatment device and method for domestic sewage

Abstract

The invention relates to the technical field of sewage treatment devices, and particularly discloses a treatment device and method for domestic sewage. Comprising a pool body, a sand hopper located at the lower end of the pool body, a stirrer arranged in the pool body, a sand discharging head assembled in the pool body in an up-down moving mode, a lifting driving piece installed above the pool body and used for driving the sand discharging head to move up and down in a reciprocating mode, a sand discharging valve installed on a sand discharging pipe and a trigger installed on the sand hopper and used for controlling opening and closing of the sand discharging valve. The tank body is communicated with a water inlet pipe and a water discharge pipe; the sand hopper is communicated with a sand discharge pipe; the size of the sand discharging head is matched with the cross section of the sand hopper, and the sand discharging head comprises an isolation plate, a filter plate distributed below the isolation plate in a spaced manner, and an elastic piece connected between the isolation plate and the filter plate; the elastic piece is used for being compressed when the filter plate pushes the sand grains so as to detect the storage amount of the sand grains. According to the domestic sewage treatment device and method, sand can be discharged in the state that the normal sand setting process is continuously carried out, and continuous sand setting and online sand discharging are achieved.

Description

Technical Field

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

[0002] With the continuous acceleration of urbanization, 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 matter and various impurities. If it is discharged directly without treatment, it will cause serious pollution to the water body, soil and even the entire ecosystem. In the process of domestic sewage treatment, the cyclone grit chamber, as one of the important devices, plays a key role. Through the cyclone effect of the water flow, heavy particles such as sand in the sewage can be settled and separated under the action of centrifugal force, thereby effectively removing sand impurities in the sewage, reducing the burden of subsequent treatment processes, and improving sewage treatment efficiency. These settled sand particles will eventually gather in the sand hopper at the bottom of the cyclone grit chamber. As a temporary storage space for sand particles, the discharge of sand particles in the sand hopper is also crucial. If the sand particles cannot be discharged in time, it will not only affect the normal operation of the cyclone grit chamber and reduce the sand settling effect, but may also cause the sand hopper to be blocked, thereby causing a series of equipment failures.

[0003] The vortex grit chamber in the prior art, such as a vortex grit chamber disclosed in a Chinese patent document with authorization announcement number CN220265376U, 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, so that the sand and gravel move with the rotation of the vortex water flow to prevent the sand and gravel from agglomerating. The middle flushing pipe impacts the water flow vortex, so that the organic matter is evenly distributed in the water flow. When the sewage is discharged 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 in the center of the water flow vortex to the water flow vortex, so that it moves with the water flow vortex, further preventing the sand and gravel at the bottom from agglomerating. The stirring part includes an upper stirring blade, a middle stirring blade and a lower stirring blade. When the stirring part rotates, a vortex can be formed in the grit chamber more quickly, and the stirring part has a better stirring effect on the sand and gravel at the bottom of the grit chamber.

[0004] However, when the sand at the bottom of the cyclone sand settling tank in the prior art accumulates to a certain extent, it is necessary to open the sand discharge pipe to discharge the sand. During the sand discharge process, it is necessary to pause or reduce the water intake to avoid the water flowing directly through the opening sand discharge port, which will affect the continuity of the water treatment process and reduce the sand settling efficiency. Summary of the invention

[0005] The present invention provides a domestic sewage treatment device and method, aiming to solve the problem in the related art that the normal sand settling process needs to be suspended when discharging sand in a cyclone sand settling tank, which will cause the operation of the device to be interrupted and the sand settling efficiency to be reduced.

[0006] The present invention provides a domestic sewage treatment device that adopts the following technical solution: A domestic sewage treatment device comprises a tank body, a sand hopper located at the lower end of the tank body, and an agitator arranged in the tank body, the tank body is connected with a water inlet pipe and a drain pipe, the sand hopper is connected with a sand discharge pipe, the domestic sewage treatment device also comprises a sand discharge head assembled in the tank body for moving up and down, a lifting driving member installed above the tank body for driving the sand discharge head to move up and down reciprocatingly, a sand discharge valve installed on the sand discharge pipe, and a trigger installed on the sand hopper for controlling the switch of the sand discharge valve; The size of the sand discharge head is adapted to the cross section of the sand hopper, and comprises an isolation plate, a filter plate spaced apart and distributed below the isolation plate, and an elastic member connected between the isolation plate and the filter plate; When the sand discharge head moves up to the highest position, a material gap is left 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 isolation plate is sealed between the sand hopper and the pool body, and the filter plate pushes the sand grains in the sand hopper to move downward, so as to level and compact the sand grains. The elastic member is used to compress when the filter plate pushes the sand to detect the storage amount of the sand. When the compression degree of the elastic member reaches a set value, the trigger opens the sand discharge valve to release the elastic potential energy stored in the elastic member, thereby driving the filter plate to move downward and push the sand out.

[0007] By adopting the above technical solution, the sand discharge head moves up and down reciprocatingly, so that when the normal sand settling process continues, the filter plate can push the sand in the sand bucket to move downward, flatten and compact the sand, and the isolation plate is sealed between the sand bucket and the pool body, effectively isolating the water flow between the pool body and the sand bucket, preventing the water flow in the pool body from entering the sand bucket 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 discharge of sand particles, which is conducive to ensuring that the sand particles can be discharged smoothly and improving the sand discharge efficiency. At the same time, through the isolation effect of the isolation plate, the sand particles in the sand bucket can be prevented from being dispersed or re-suspended by the water flow during the sand discharge process, ensuring that the sand settling process is not disturbed and improving the sand settling efficiency. The storage amount of the sand particles is detected by the elastic member. When the storage amount of the sand particles reaches a certain value, the trigger automatically opens the sand discharge valve to release the elastic potential energy stored in the elastic member, thereby driving the filter plate to move downward to push the sand particles out. In this way, the sand settling process in the pool body can continue without being affected by the sand discharge operation, thereby realizing continuous sand settling and online sand discharge, and significantly improving the water treatment efficiency.

[0008] Furthermore, a water hole penetrating from top to bottom is provided on the isolation plate, and a one-way valve allowing water to flow upward is installed at the water hole.

[0009] With the above technical solution, the one-way valve is used to maintain the pressure stability on the upper and lower 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.

[0010] Furthermore, the output shaft of the lifting drive member has a slot, the upper end of the isolation plate is connected to a sleeve, a card block is installed in the sleeve through a plug spring, and the plug spring is used to apply elastic force to the card block so that the card block is inserted into the slot, thereby connecting the sand discharge head to the output shaft of the lifting drive member; The upper end of the filter plate is connected to an inner shaft that penetrates upward into the sleeve. The upper end of the inner shaft has a pushing head, which is used to push the block upward to move the block out of the slot, thereby disengaging the sand discharge head from the output shaft of the lifting drive member.

[0011] Furthermore, the lower end of the output shaft has a protruding portion, the slot is opened on the protruding portion and extends horizontally, the two blocks are symmetrically distributed relative to the central axis of the sleeve, so that they approach each other under the drive of the plug-in spring and are inserted into the slot from both ends of the slot respectively, the lower end of each block has a slope inclined downward from the inside to the outside, and the cross-section of the pushing head is an isosceles trapezoid with a small upper part and a large lower part, so as to push upward against the slopes at the lower ends of the two blocks so that the two blocks are away from each other.

[0012] Furthermore, the upper end of each of the blocks has a slope that slopes downward from the outside to the inside, and the lower end of the protruding portion gradually shrinks for inserting downward into the sleeve and pushing against the slopes on the upper ends of the two blocks, thereby moving the two blocks away from each other.

[0013] By adopting the above technical solution, the lower end of the extension part is gradually reduced, so that the extension part can push downward against the inclined surface of the upper ends of the two blocks, so that the two blocks move away from each other, and then the extension part can be smoothly moved down between the two blocks, so that the sand discharge head and the output shaft of the lifting drive can be reconnected.

[0014] Further, the trigger includes a moving platform assembled on the sand bucket for moving up and down, a first spring connected between the moving platform and the sand bucket, a rack arranged on the moving platform, a first gear rotatably mounted on the sand bucket and meshing with the rack, a first bevel gear coaxially arranged with the first gear, and a second bevel gear arranged on the sand discharge valve and meshing with the first bevel gear; The upper surface of the isolation plate is equipped with a trigger rod that moves radially along the isolation plate. A return spring is arranged between the isolation plate and the trigger rod. The return spring is used to apply elastic force to the trigger rod so that the trigger rod moves inward. The inner shaft has a receiving groove extending up and down for accommodating the trigger rod. When the filter plate is close to the isolation plate, the lower groove wall of the receiving groove can push the trigger rod so that the trigger rod moves outward and extends to the moving platform, so that the trigger rod can push the moving platform to move downward.

[0015] Furthermore, the inner end of the trigger rod has an inclined surface that slopes downward from the inside to the outside, and the lower groove wall of the accommodating groove slopes downward from the inside to the outside, and is used to push upward against the inclined surface of the inner end of the trigger rod to move the trigger rod outward.

[0016] Furthermore, a material guide plate is installed on the inner side wall of the pool body, and the material guide plate is spirally distributed around the central axis of the pool body.

[0017] With the above technical solution, the guide plate is used to guide the sand particles to move downward through its spirally distributed structure, thereby ensuring that the sand particles can settle evenly.

[0018] Furthermore, the drainage pipe is located above the water inlet pipe, and the pool body is also provided with a first filter plate located at the lower end of the drainage pipe and a second filter plate located at the connection point between the pool body and the drainage pipe.

[0019] By adopting the above technical scheme, the first filter plate is used to perform preliminary filtration on the domestic sewage after sand settling treatment to intercept larger particles of impurities, and the second filter plate is used to perform secondary filtration on the domestic sewage after the preliminary filtration to intercept smaller particles of impurities, thereby reducing the processing load of subsequent treatment units and improving drainage quality.

[0020] The present invention also provides a method for treating domestic sewage, comprising the following steps: In the first step, the sand particles settle. The domestic sewage enters the tank through the water inlet pipe and is discharged through the drain pipe. The agitator stirs the water in the tank to form a vortex flow. The sand particles in the domestic sewage settle and separate under the action of centrifugal force. The second step is to compact the sand particles. The lifting drive member drives the sand discharge head to move up and down in the tank body. When the sand discharge head moves up to the highest position, there is a gap between the sand discharge head and the sand hopper. The settled sand particles enter the sand hopper through the gap. When the sand discharge head moves down to the lowest position, it extends into the sand hopper to seal the isolation plate between the sand hopper and the tank body. The filter plate pushes the sand particles in the sand hopper to move downward to level and compact the sand particles. The third step is to discharge the sand. When the filter plate pushes the sand, the elastic part is compressed. When the compression degree of the elastic part reaches the set value, the trigger opens the sand discharge valve, and the elastic potential energy stored in the elastic part is released, driving the filter plate to move downward. The filter plate pushes the sand to be discharged through the sand discharge pipe.

[0021] By adopting the above technical solution, the sand discharge head moves up and down reciprocatingly, so that when the normal sand settling process continues, the filter plate can push the sand in the sand hopper to move downward, flatten and compact the sand, and 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. The storage amount of sand is detected by the elastic part. When the storage amount of sand reaches a certain value, the trigger automatically opens the sand discharge valve to release the elastic potential energy stored in the elastic part, thereby driving the filter plate to move downward to push the sand out. In this way, the sand settling process in the pool body can continue without being affected by the sand discharge operation, thereby realizing continuous sand settling and online sand discharge, and significantly improving water treatment efficiency.

[0022] The beneficial effect of the domestic sewage treatment device and method provided by the present invention is that: through the reciprocating up and down movement of the sand discharge head, the filter plate can push the sand in the sand hopper to move downward and flatten and compact the sand while the normal sand settling process is ongoing, and 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, preventing 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 discharge of sand particles, which is conducive to ensuring that the sand particles can be discharged smoothly and improving the sand discharge efficiency. At the same time, through the isolation effect of the isolation plate, the sand particles in the sand hopper can be prevented from being dispersed or re-suspended by the water flow during the sand discharge process, ensuring that the sand settling process is not disturbed and improving the sand settling efficiency. The storage amount of the sand particles is detected by the elastic member, and when the storage amount of the sand particles reaches a certain value, the trigger automatically opens the sand discharge valve to release the elastic potential energy stored in the elastic member, thereby driving the filter plate to move downward and push the sand particles out. In this way, the sand settling process in the pool can continue without being affected by the sand discharge operation, thus realizing continuous sand settling and online sand discharge, significantly improving water treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of a domestic sewage treatment device of the present invention.

[0024] Figure 2 It is a schematic structural diagram of the domestic sewage treatment device of the present invention from another viewing angle.

[0025] Figure 3 It is a structural schematic diagram of a sand discharge head of a domestic sewage treatment device of the present invention.

[0026] Figure 4 It is a structural schematic diagram of a domestic sewage treatment device of the present invention in which a sand discharge head and an output shaft are in a connected state.

[0027] Figure 5 It is a structural schematic diagram of the domestic sewage treatment device of the present invention, in which the sand discharge head and the output shaft are in a disengaged state.

[0028] Figure 6 It is a schematic structural diagram of a trigger of a domestic sewage treatment device of the present invention.

[0029] Figure 7 It is a schematic structural diagram of the trigger of the domestic sewage treatment device of the present invention from another perspective.

[0030] Reference numerals: 10, tank body; 110, water inlet pipe; 120, drain pipe; 20, sand bucket; 210, sand discharge pipe; 30, agitator; 310, stirring motor; 320, stirring drum; 330, stirring blade; 40, sand discharge head; 410, isolation plate; 411, one-way valve; 420, filter plate; 430, elastic member; 440, sleeve; 441, plug spring; 442, block; 450, inner shaft; 451, push head; 4 52. Receiving groove; 460. Trigger rod; 470. Return spring; 50. Lifting drive member; 510. Output shaft; 511. Extension portion; 512. Slot; 60. Sand discharge valve; 70. Trigger; 710. Moving platform; 720. First spring; 730. Rack; 740. First gear; 750. First bevel gear; 760. Second bevel gear; 80. Material guide plate; 910. First filter plate; 920. Second filter plate. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0032] like Figures 1 to 7 As shown, an embodiment of the domestic sewage treatment device of the present invention comprises a tank body 10, a sand hopper 20, an agitator 30, a sand discharge head 40, a lifting drive 50, a sand discharge valve 60 and a trigger 70. The tank body 10 is the main container for treating domestic sewage, which is used to contain domestic sewage and perform sand settling treatment; the sand hopper 20 is located at the lower end of the tank body 10 and is connected to the tank body 10, and is used to collect and store settled sand particles; the agitator 30 is arranged in the tank body 10, and is used to stir the domestic sewage in the tank body 10 to form a vortex water flow, thereby helping the sand particles to settle; the sand discharge head 40 is assembled in the tank body 10 to move up and down, and can extend downward into the sand hopper 20, and is used to compact and push the sand particles in the sand hopper 20; the lifting drive 50 is installed above the tank body 10, and is used to drive the sand discharge head 40 to move up and down; the sand discharge valve 60 is installed on the sand discharge pipe 210, and is used to control the discharge of sand particles in the sand hopper 20; the trigger 70 is installed on the sand hopper 20, and is used to control the switch of the sand discharge valve 60.

[0033] like Figure 1 and Figure 2As shown, the tank body 10 is cylindrical in shape and has a conical bottom to facilitate the gathering and discharge of sand particles. The tank body 10 is connected with an inlet pipe 110 and a drain pipe 120. The inlet pipe 110 is used to introduce domestic sewage into the tank body 10. The drain pipe 120 is located above the inlet pipe 110 and is used to discharge the domestic sewage after the sand settling treatment.

[0034] A material guide plate 80 is fixedly installed on the inner wall of the cylindrical section of the pool body 10. The material guide plate 80 is spirally distributed around the central axis of the pool body 10. The material guide plate 80 is used to guide the sand particles to move downward through its spirally distributed structure to ensure that the sand particles can settle evenly.

[0035] The tank body 10 is also fixedly installed with a first filter plate 910 located at the lower end of the drain pipe 120 and a second filter plate 920 located at the connection between the tank body 10 and the drain pipe 120. The first filter plate 910 is used to perform preliminary filtration on the domestic sewage after the grit settling treatment to intercept larger particles of impurities, and the second filter plate 920 is used to perform secondary filtration on the domestic sewage after the preliminary filtration to intercept smaller particles of impurities, thereby reducing the processing load of the subsequent processing unit and improving the drainage quality.

[0036] like Figure 2 As shown, the agitator 30 includes a stirring drum 320 rotatably mounted in the tank body 10, a plurality of stirring blades 330 fixed on the stirring drum 320 along the circumference of the stirring drum 320, and a stirring motor 310 mounted 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. The plurality of stirring blades 330 stir the domestic sewage in the tank body 10 to form a vortex water flow, thereby helping the sand particles to settle.

[0037] like Figure 2 As shown, the sand hopper 20 is cylindrical as a whole, and the lower end of the sand hopper 20 is connected to a sand discharge pipe 210 , which is used to discharge the sand particles in the sand hopper 20 .

[0038] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the lifting drive member 50 in the embodiment is a hydraulic cylinder, and an output shaft 510 is installed at the output end of the lifting drive member 50. The lower end of the output shaft 510 has an extension portion 511, and the lower end of the extension portion 511 gradually decreases. The extension portion 511 is provided with a horizontally extending slot 512, and the slot 512 is used to connect the sand discharge head 40. In other embodiments, the lifting drive member 50 can also be a cylinder or an electric push rod.

[0039] like Figures 2 to 5As shown, the sand discharge head 40 includes an isolation plate 410, a filter plate 420 distributed in the air below the isolation plate 410, an elastic member 430 connected between the isolation plate 410 and the filter plate 420, a sleeve 440 arranged at the upper end of the isolation plate 410, an inner shaft 450 arranged at the upper end of the filter plate 420, a trigger rod 460 assembled on the upper surface of the isolation plate 410 for radial movement along the isolation plate 410, and a return spring 470 connected between the isolation plate 410 and the trigger rod 460.

[0040] The sizes of the isolation plate 410 and the filter plate 420 are both adapted to the cross-section of the sand hopper 20. The isolation plate 410 is used to seal between the sand hopper 20 and the pool body 10 during the sand discharge process, 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 directly flowing out through the sand discharge port that is being opened, reducing the interference of the water flow on the discharge of sand particles, which is conducive to ensuring that the sand particles can be discharged smoothly and improving the sand discharge efficiency. At the same time, through the isolation effect of the isolation plate 410, the sand particles in the sand hopper 20 can be prevented from being dispersed or re-suspended by the water flow during the sand discharge process, ensuring that the sand settling process is not disturbed and improving the sand settling efficiency. A water hole that runs through the upper and lower parts is opened on the isolation plate 410, and a one-way valve 411 that allows water to flow upward is installed at the water hole. The one-way valve 411 is provided to maintain the pressure stability on the upper and lower sides of the isolation plate 410 to reduce the resistance of the water flow to the downward movement of the isolation plate 410 and ensure the smooth downward movement of the isolation plate 410.

[0041] The filter plate 420 is used to push the sand in the sand hopper 20 downward to flatten and compact the sand, ensure that the sand is closely arranged, reduce the gaps between the sand, and push the sand downward when the storage amount of the sand reaches a certain value to ensure that the sand is discharged smoothly.

[0042] 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 compress when the filter plate 420 pushes the sand to detect the storage amount of the sand, and release elastic potential energy when the sand discharge valve 60 is opened to drive the filter plate 420 to move downward, so that the filter plate 420 can push the sand downward to discharge. In other embodiments, the elastic member 430 can also be a reed or other elastic member, but is not limited thereto.

[0043] The extension 511 can be inserted downward into the sleeve 440, and a clamping block 442 is installed in the sleeve 440 through the plug spring 441. The two clamping blocks 442 are symmetrically distributed relative to the central axis of the sleeve 440, so that they are close to each other under the drive of the plug spring 441, and are respectively inserted into the slot 512 from both ends of the slot 512, so that the sand discharge head 40 is connected to the output shaft 510 of the lifting drive member 50. The upper end of each clamping block 442 has an inclined surface that tilts downward from the outside to the inside, and the lower end of each clamping block 442 has an inclined surface that tilts downward from the inside to the outside. The inner shaft 450 is inserted upward into the sleeve 440. The upper end of the inner shaft 450 is provided with a pushing head 451. The cross section of the pushing head 451 is an isosceles trapezoid with a small upper part and a large lower part. The pushing head 451 is used to push upward against the inclined surfaces at the lower ends of the two clamping blocks 442 to move the two clamping blocks 442 away from each other, so that the clamping blocks 442 are moved out of the slot 512, thereby disengaging the sand discharge head 40 from the output shaft 510 of the lifting drive member 50.

[0044] In addition, the gradually narrowing setting of the lower end of the extension portion 511 enables the extension portion 511 to push downward against the inclined surfaces of the upper ends of the two clamping blocks 442, so that the two clamping blocks 442 move away from each other, and then the extension portion 511 can smoothly move downward between the two clamping blocks 442, so that the sand discharge head 40 and the output shaft 510 of the lifting drive member 50 can be reconnected.

[0045] like Figure 6 and Figure 7 As shown, the trigger 70 includes a moving platform 710 assembled on the sand bucket 20 for vertical movement, a first spring 720 connected between the moving platform 710 and the sand bucket 20, a rack 730 provided on the moving platform 710, a first gear 740 rotatably installed on the sand bucket 20 and meshing with the rack 730, a first bevel gear 750 coaxially provided 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 elastic force to the moving platform 710 so that the moving platform 710 moves upward and resets.

[0046] The return spring 470 is used to apply elastic force to the trigger rod 460 to move the trigger rod 460 inward, and 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 that extends up and down to accommodate the trigger rod 460, and the lower groove wall of the receiving groove 452 slopes downward from the inside to the outside.

[0047] It should be noted that as the sand settling process continues, the sand stored in the sand hopper 20 gradually increases, and is flattened and compacted by the filter plate 420 multiple times during the reciprocating movement of the sand discharge head 40. Each time the sand discharge head 40 moves down to the lowest position so that the filter plate 420 pushes the sand, the downward movement resistance of the filter plate 420 will gradually increase due to the gradual increase in the amount of sand stored in the sand hopper 20, and the compression degree of the elastic member 430 will also gradually increase. Accordingly, the filter plate 420 gradually moves up 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 sand reaches a certain value and the compression degree of the elastic member 430 reaches a set value, the distance between the filter plate 420 and the isolation plate 410 is reduced to the point that the lower groove wall of the accommodating 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 movable platform 710. At this time, under the drive of the lifting drive member 50, the isolation plate 410 continues to move downward, and pushes the movable platform 710 downward through the trigger rod 460, and the movable platform 710 drives the rack 730 to move downward, and 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.

[0048] An embodiment of the method for treating domestic sewage of the present invention comprises the following steps: In the first step, the sand particles are settled, and the domestic sewage enters the tank body 10 through the water inlet pipe 110 and is discharged through the drain pipe 120. The agitator 30 stirs the water in the tank body 10 to form a vortex flow, and the sand particles in the domestic sewage are settled and separated under the action of centrifugal force.

[0049] In the second step, the sand particles are compacted. The sand discharge head 40 is connected to the output shaft 510 of the lifting drive member 50. The lifting drive member 50 drives the sand discharge head 40 to move up and down in the pool 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 bucket 20, and the settled sand particles enter the sand bucket 20 through the material passing gap; when the sand discharge head 40 moves down to the lowest position, it extends into the sand bucket 20, so that the isolation plate 410 is sealed between the sand bucket 20 and the pool body 10, and the sand settling process above the isolation plate 410 is not disturbed and continues, and the filter plate 420 pushes the sand particles in the sand bucket 20 to move downward, so as to level and compact the sand particles.

[0050] The third step is sand storage. As the sand settling process continues, the sand stored in the sand bucket 20 gradually increases, and is flattened and compacted by the filter plate 420 many times during the reciprocating movement of the sand discharge head 40. When the storage amount of the sand 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 is reduced to the point where 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, under the drive of the lifting drive member 50, the isolation plate 410 continues to move downward, and the trigger rod 460 pushes the moving platform 710 downward, and the moving platform 710 drives the rack 730 downward, and 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 start rotating and gradually open.

[0051] Step 4: Sand is discharged. 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 is reduced until the push head 451 of the inner shaft 450 pushes the two blocks 442 to move the two blocks 442 away from each other, so that the blocks 442 are moved out of the slot 512, thereby disengaging the sand discharge head 40 from the output shaft 510 of the lifting drive 50. Driven by the lifting drive 50, the output shaft 510 moves up and continues to reciprocate up and down, the isolation plate 410 remains in place, the sand is gradually discharged 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, and the filter plate 420 pushes the sand to be discharged through the sand discharge pipe 210.

[0052] Step 5: Reset. When the filter plate 420 moves downward under the drive of 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 under the drive of the reset spring 470, so that the limit of the movable platform 710 by the trigger rod 460 is released. The movable platform 710 can move upward and reset under the drive of the first spring 720, and then drive the sand discharge valve 60 to close. When the output shaft 510 moves downward under the drive of the lifting drive member 50, the extension part 511 pushes downward against the inclined surface of the upper ends of the two blocks 442, so that the two blocks 442 move away from each other, and then the extension part 511 moves down smoothly between the two blocks 442, so that the sand discharge head 40 is reconnected with the output shaft 510 of the lifting drive member 50.

[0053] In this way, the embodiment of the domestic sewage treatment device and method of the present invention reciprocates up and down through the sand discharge head 40, so that when the normal sand settling process continues, the filter plate 420 can push the sand in the sand bucket 20 to move downward, flatten and compact the sand, and the isolation plate 410 is sealed between the sand bucket 20 and the pool body 10, effectively isolating the water flow between the pool body 10 and the sand bucket 20, preventing the water flow in the pool body 10 from entering the sand bucket 20 during the sand discharge process, and directly flowing out through the opening sand discharge port, reducing the interference of the water flow on the discharge of sand particles, which is conducive to ensuring that the sand particles can be discharged smoothly and improving the sand discharge efficiency. At the same time, through the isolation effect of the isolation plate 410, the sand particles in the sand bucket 20 can be prevented from being dispersed or re-suspended by the water flow during the sand discharge process, ensuring that the sand settling process is not disturbed and improving the sand settling efficiency. The storage amount of sand is detected by the elastic member 430. When the storage amount of sand reaches a certain value, the trigger 70 automatically opens the sand discharge valve 60 to release the elastic potential energy stored in the elastic member 430, thereby driving the filter plate 420 to move downward to push the sand out. In this way, the sand settling process in the pool body 10 can be carried out continuously without being affected by the sand discharge operation, thereby realizing continuous sand settling and online sand discharge, and significantly improving the water treatment efficiency.

[0054] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A domestic sewage treatment device, comprising a tank body, a sand hopper located at the lower end of the tank body, and an agitator arranged in the tank body, wherein the tank body is connected to a water inlet pipe and a drain pipe, and the sand hopper is connected to a sand discharge pipe, characterized in that: The domestic sewage treatment device also includes a sand discharge head installed in the pool body for moving up and down, a lifting drive member installed above the pool body for driving the sand discharge head to move up and down reciprocatingly, a sand discharge valve installed on the sand discharge pipe, and a trigger installed on the sand bucket for controlling the opening and closing of the sand discharge valve; The size of the sand discharge head is adapted to the cross section of the sand hopper, and comprises an isolation plate, a filter plate spaced apart and distributed below the isolation plate, and an elastic member connected between the isolation plate and the filter plate; When the sand discharge head moves up to the highest position, a material gap is left 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 isolation plate is sealed between the sand hopper and the pool body, and the filter plate pushes the sand grains in the sand hopper to move downward, so as to level and compact the sand grains. The elastic member is used to compress when the filter plate pushes the sand to detect the storage amount of the sand. When the compression degree of the elastic member reaches a set value, the trigger opens the sand discharge valve to release the elastic potential energy stored in the elastic member, thereby driving the filter plate to move downward and push the sand out.

2. A domestic sewage treatment device according to claim 1, characterized in that: The isolation plate is provided with a water hole which passes through from top to bottom, and a one-way valve which allows water to flow upward is installed at the water hole.

3. A domestic sewage treatment device according to claim 1, characterized in that: The output shaft of the lifting drive member has a slot, the upper end of the isolation plate is connected to a sleeve, a clamping block is installed in the sleeve through a plug-in spring, and the plug-in spring is used to apply elastic force to the clamping block so that the clamping block is inserted into the slot, thereby connecting the sand discharge head to the output shaft of the lifting drive member; The upper end of the filter plate is connected to an inner shaft that penetrates upward into the sleeve. The upper end of the inner shaft has a pushing head, which is used to push the block upward to move the block out of the slot, thereby disengaging the sand discharge head from the output shaft of the lifting drive member.

4. A domestic sewage treatment device according to claim 3, characterized in that: The lower end of the output shaft has a protruding portion, the slot is opened on the protruding portion and extends horizontally, the two blocks are symmetrically distributed relative to the central axis of the sleeve, so that they are driven by the plug-in spring to approach each other and are inserted into the slot from both ends of the slot respectively, the lower end of each block has an inclined surface sloping downward from the inside to the outside, and the cross-section of the pushing head is an isosceles trapezoid with a small upper part and a large lower part, so as to push upward against the inclined surfaces of the lower ends of the two blocks so that the two blocks are away from each other.

5. A domestic sewage treatment device according to claim 4, characterized in that: The upper end of each of the blocks has an inclined surface that slopes downward from the outside to the inside, and the lower end of the protruding portion gradually shrinks for inserting downward into the sleeve and pushing against the inclined surfaces at the upper ends of the two blocks, thereby moving the two blocks away from each other.

6. A domestic sewage treatment device according to claim 3, characterized in that: The trigger includes a moving platform mounted on the sand bucket for vertical movement, a first spring connected between the moving platform and the sand bucket, a rack arranged on the moving platform, a first gear rotatably mounted on the sand bucket and meshing with the rack, a first bevel gear coaxially arranged with the first gear, and a second bevel gear arranged on the sand discharge valve and meshing with the first bevel gear; The upper surface of the isolation plate is equipped with a trigger rod that moves radially along the isolation plate. A return spring is arranged between the isolation plate and the trigger rod. The return spring is used to apply elastic force to the trigger rod so that the trigger rod moves inward. The inner shaft has a receiving groove extending up and down for accommodating the trigger rod. When the filter plate is close to the isolation plate, the lower groove wall of the receiving groove can push the trigger rod so that the trigger rod moves outward and extends to the moving platform, so that the trigger rod can push the moving platform to move downward.

7. A domestic sewage treatment device according to claim 6, characterized in that: The inner end of the trigger rod has an inclined surface that slopes downward from the inside to the outside, and the lower groove wall of the accommodating groove slopes downward from the inside to the outside, and is used to push upward against the inclined surface of the inner end of the trigger rod to move the trigger rod outward.

8. A domestic sewage treatment device according to any one of claims 1 to 7, characterized in that: The inner side wall of the pool body is provided with a material guide plate, and the material guide plate is spirally distributed around the central axis of the pool body.

9. A domestic sewage treatment device according to any one of claims 1 to 7, characterized in that: The drain pipe is located above the water inlet pipe, and the pool body is also provided with a first filter plate located at the lower end of the drain pipe and a second filter plate located at the connection point between the pool body and the drain pipe.

10. A method for treating domestic sewage, characterized in that: The domestic sewage treatment device according to claim 1 comprises the following steps: In the first step, the sand particles settle. The domestic sewage enters the tank through the water inlet pipe and is discharged through the drain pipe. The agitator stirs the water in the tank to form a vortex flow. The sand particles in the domestic sewage settle and separate under the action of centrifugal force. The second step is to compact the sand particles. The lifting drive member drives the sand discharge head to move up and down in the tank body. When the sand discharge head moves up to the highest position, there is a gap between the sand discharge head and the sand hopper. The settled sand particles enter the sand hopper through the gap. When the sand discharge head moves down to the lowest position, it extends into the sand hopper to seal the isolation plate between the sand hopper and the tank body. The filter plate pushes the sand particles in the sand hopper to move downward to level and compact the sand particles. The third step is to discharge the sand. When the filter plate pushes the sand, the elastic part is compressed. When the compression degree of the elastic part reaches the set value, the trigger opens the sand discharge valve, and the elastic potential energy stored in the elastic part is released, driving the filter plate to move downward. The filter plate pushes the sand to be discharged through the sand discharge pipe.

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