A grit removal device for aerated grit chambers

Abstract

The application discloses an aerated grit chamber sand removal device to solve the problems of the existing aerated grit chamber sand removal device, such as the suction inlet of the sand suction pump being easily buried and blocked, the sand suction pump being unable to continuously operate, and complicated operation and inconvenient maintenance. The application comprises an aerated grit chamber, a movable bridge and a sand suction pump, the upper part of the movable bridge is provided with a lifting mechanism, the outlet end of the sand suction pump is sequentially connected with the sand removal tank through a steel flexible pipe and a steel pipe, the application has the advantages of compact structure and simple operation, the upper part of the movable bridge is provided with the lifting mechanism, the lifting mechanism can move along the length and width of the tank body, the sand suction pump at the bottom of the movable bridge is precisely positioned and lifted, meanwhile, the whole sand suction pump is a modular unit which can be integrally lifted, the lifting mechanism is used for adjusting the relative height of the suction inlet of the sand suction pump and the bottom surface of the sand collecting groove, so that the amount of mud and sand can be flexibly dealt with, and the outlet end of the sand suction pump is connected with the steel pipe through the steel flexible pipe, and the mixture of mud and water is discharged to the sand removal tank.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, specifically to a sand removal device for an aerated grit chamber. Background Technology

[0002] In the treatment of municipal wastewater, aerated grit chambers are required to remove fine-grained sand and gravel (d≥0.2mm) and floating grease from the wastewater.

[0003] The existing aerated grit chamber desanding device includes a rectangular tank. An aeration device is installed on one side of the rectangular tank along its length. A sand collection trough is located at the bottom of the rectangular tank. A bridge-type grit remover and its sliding rail are installed across the top of the rectangular tank. A sand suction pump that moves with the bridge is installed at the bottom of the bridge-type grit remover. Desanding tanks are also located on both sides of the top of the rectangular tank. The outlet of the sand suction pump is connected to the desanding tanks through a sand discharge pipe. During operation, the aeration disturbance creates a spiral flow field. Sand particles settle to the sand collection trough under the action of swirling flow and gravity. The grit remover moves back and forth along the sliding rail, and the sand suction pump continuously or intermittently pumps the sand-water mixture to the top desanding tank for preliminary separation before discharge.

[0004] However, the above-mentioned aerated grit chamber sand removal device has the following defects:

[0005] 1. The outlet of the sand suction pump first passes through a vertical first rigid pipe and then turns into a horizontal second rigid pipe, forming an "L" shaped pipeline. The end of this pipeline is connected to the sand removal tank. When repairing the pump body, the vertical section must be removed first, and a lifting frame must be erected on the top of the tank or a crane must be used for lifting, which makes the operation cumbersome and maintenance inconvenient.

[0006] 2. Existing sand suction pumps generally adopt a "pump base-pump body" coupled fixing structure. The pump body must be placed on the mounting base as a whole and form a rigid coupling with the base before it can operate. When the sand content in the sewage increases, the deposited sand layer can easily bury the bottom suction port of the pump body, causing suction port blockage. At this time, the pump must be stopped and the entire pump lifted for manual dredging, which not only disrupts continuous operation, but also significantly increases the frequency of maintenance and labor intensity.

[0007] 3. Existing mobile bridges typically have a sand suction pump installed in each of the two pools, resulting in low sand removal efficiency and poor flexibility. Utility Model Content

[0008] Therefore, this application provides a sand removal device for aerated grit chambers to solve the problems of the suction pump inlet of existing aerated grit chamber sand removal devices being easily buried and blocked, causing the suction pump to be unable to operate continuously, as well as the cumbersome operation and inconvenient maintenance.

[0009] To achieve the above objectives, this application provides the following technical solution:

[0010] A sand removal device for an aerated grit chamber includes: an aerated grit chamber, a movable bridge, and a sand suction pump. The aerated grit chamber includes a tank body, a sand collection trough is provided at the bottom of the tank body, the movable bridge is provided at the top of the tank body, and two transverse guide rails are provided on both sides of the top of the tank body along its length, so that the movable bridge moves back and forth along the two transverse guide rails under the drive of a first drive mechanism.

[0011] The upper part of the movable bridge is equipped with a lifting mechanism, and the bottom of the movable bridge is equipped with a longitudinal guide rail corresponding to the position of the sand collection trough. The longitudinal guide rail is provided with a sliding groove along its length, and a roller is provided on one side of the sand suction pump inside the sliding groove. Under the action of the lifting mechanism, the roller drives the sand suction pump to slide up and down along the sliding groove, thereby adjusting the relative height between the suction port of the sand suction pump and the bottom surface of the sand collection trough.

[0012] The outlet end of the sand suction pump is connected to one end of a rigid hose, and the other end of the rigid hose is connected to the sand removal tank via a rigid pipe.

[0013] Optionally, the lifting mechanism includes a lifting frame and an electric hoist mounted on the lifting frame;

[0014] The top of the movable bridge is provided with a first slide rail along the width direction of the pool body, and the bottom of the lifting frame is provided with the first slide rail via a first pulley and moves along the first slide rail via a second drive mechanism;

[0015] The top of the lifting frame is provided with a second slide rail along the length of the pool body. The electric hoist is set at the second slide rail via a second pulley and moves along the second slide rail via a third drive mechanism.

[0016] Optionally, the roller is fixed to the pump body of the sand suction pump by an annular structural member.

[0017] Optionally, the aerated grit chamber includes two rectangular chambers arranged side by side;

[0018] The number of sand suction pumps is four, and the four sand suction pumps are arranged symmetrically in pairs along the front and rear sides of the movable bridge.

[0019] Optionally, the sand suction pump is a cutting-type sand suction pump.

[0020] Optionally, it also includes a sand content detection unit, which is used to detect the sand content in the wastewater;

[0021] The output of the sand content detection unit is connected to the input of the control terminal, and the three outputs of the control terminal are respectively connected to the drive mechanism of the mobile bridge, the sand suction pump, and the lifting mechanism.

[0022] Optionally, the sand content detection unit is an ultrasonic mud level meter or an optical turbidity sensor.

[0023] Optionally, the top of the sand suction pump is provided with a lifting ring, which is connected to the lifting device of the lifting mechanism via a chain.

[0024] Optionally, the rigid pipe is fixed to the movable cable tray by pipe clamps.

[0025] Compared with the prior art, this application has at least the following beneficial effects:

[0026] 1. This application provides a sand removal device for an aerated grit chamber. The overall structure is simple and easy to operate. A lifting mechanism is installed on the upper part of the movable bridge, and the drive mechanism allows the lifting mechanism to move along the length and width of the chamber, precisely positioning and lifting the sand suction pump at the bottom of the movable bridge. This effectively avoids the cumbersome operation caused by the need to erect a lifting frame or use a crane on-site in traditional technologies, greatly saving maintenance time and improving maintenance efficiency. The outlet end of the sand suction pump is connected to a horizontally arranged steel pipe via a rigid hose, discharging the mud-water mixture into the sand removal tank, effectively avoiding the trouble of disassembling the longitudinal steel pipe during the maintenance of traditional sand suction pumps. This further improves maintenance efficiency. Meanwhile, the pump body and base of the sand suction pump are integrally formed, making the entire pump a modular unit that can be lifted as a whole. The sand suction pump can be flexibly moved using the lifting mechanism according to the amount of sand, thereby adjusting the relative height between the pump's suction inlet and the bottom of the sand collection trough. This effectively solves the problem of clogging and shutdown under high sand content conditions, reducing maintenance frequency and labor intensity. The lifting mechanism and sand suction pump can be quickly disassembled, eliminating the need to empty the sedimentation tank during maintenance. The longitudinal guide rail has a groove along its length, and a roller located inside the groove on one side of the sand suction pump drives it to slide up and down along the groove, further ensuring the reliability of the sand suction pump's lifting.

[0027] 2. This application is equipped with four sand suction pumps, which are symmetrically arranged in pairs along the front and rear sides of the movable bridge, which significantly improves the sand removal efficiency and the continuous operation reliability of the aerated grit chamber.

[0028] 3. The lifting mechanism of this application, through the drive mechanism and the setting of the first and second slide rails, enables the electric hoist to move along the width direction (Y direction) and along the length direction (X direction) of the pool, thereby allowing the electric hoist to cover any point on the entire pool surface and accurately position and lift the four sand suction pumps on the front or rear side.

[0029] 4. This application also includes a sand content detection unit and a control terminal. The sand content detection unit monitors the sand content of the wastewater in real time and outputs a signal to the control terminal. The control terminal then controls the operation of the lifting mechanism. When the detected sand content is higher than the set threshold, the lifting mechanism raises the suction port of the sand suction pump to avoid being buried by the high sand layer. When the detected sand content is lower than the set threshold, the lifting mechanism lowers the suction port of the sand suction pump to the optimal suction height to ensure suction efficiency. This application is linked with the control terminal and adjusts the suction port height of the sand suction pump in real time according to the change of sand content. No manual intervention is required throughout the process. This avoids shutdown and clogging caused by high sand content and ensures continuous and efficient sand removal when the sand content is low, significantly reducing maintenance frequency and operating energy consumption. Attached Figure Description

[0030] To more intuitively illustrate the prior art and this application, exemplary drawings are provided below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing this application; for example, based on the technical concept disclosed in this application and the exemplary drawings, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, size ratios, etc. of certain units (components).

[0031] Figure 1 A schematic diagram of the structure of an aerated grit chamber sand removal device provided in one embodiment of this application;

[0032] Figure 2 for Figure 1 A partial schematic diagram of the mobile cable tray and lifting mechanism;

[0033] Figure 3 for Figure 1 The sectional view shown Figure 1 ;

[0034] Figure 4 for Figure 1 The sectional view shown Figure 2 ;

[0035] Figure 5 for Figure 1 A partial schematic diagram of the longitudinal guide rail, sand suction pump, and chain;

[0036] Figure 6 for Figure 1 A partial schematic diagram of the connection between the longitudinal guide rail and the sand suction pump.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Aerated grit chamber; 101. Chamber body; 102. Grit collection trough; 2. Movable cable tray; 201. First slide rail; 3. Sand suction pump; 301. Pump body; 302. Lifting ring; 4. Lifting mechanism; 401. Lifting frame; 402. Electric hoist; 403. Second slide rail; 5. Horizontal guide rail; 6. Longitudinal guide rail; 601. Slide chute; 7. Rigid flexible hose; 8. Rigid pipe; 9. Roller; 10. Grit removal tank; 11. Chain; 12. Annular structural component. Detailed Implementation

[0039] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "comprising," "including," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0041] The terms used in this application, such as "upper," "lower," "left," "right," and "middle," are generally used to indicate the general relative positional relationship for the purpose of intuitive understanding by referring to the accompanying drawings, and are not absolute limitations on the positional relationship in the actual product.

[0042] One embodiment of this application provides a sand removal device for an aerated grit chamber, such as... Figures 1-6 As shown, it includes: an aerated grit chamber 1, a movable bridge frame 2, and a sand suction pump 3; the aerated grit chamber 1 includes a tank body 101, and a sand collection trough 102 is provided at the bottom of the tank body 101; the pump base and pump body 301 of the sand suction pump 3 are integrally formed, and the whole pump is a modular unit that can be lifted as a whole; the movable bridge frame 2 is provided at the top of the tank body 101, and two transverse guide rails 5 are provided on both sides of the top of the tank body 101 along its length direction, and the movable bridge frame 2 reciprocates along the two transverse guide rails 5 under the drive of the first drive mechanism;

[0043] The upper part of the movable cable tray 2 is equipped with a lifting mechanism 4, which is used to lift or lower the sand suction pump 3 to adjust the relative height between the suction port of the sand suction pump 3 and the bottom surface of the sand collection trough 102. The bottom of the movable cable tray 2 is equipped with a longitudinal guide rail 6 corresponding to the position of the sand collection trough 102. The longitudinal guide rail 6 is provided with a sliding groove 601 along its length. A roller 9 is provided on one side of the sand suction pump 3 and is located inside the sliding groove 601. Under the action of the lifting mechanism 4, the roller 9 drives the sand suction pump 3 to slide up and down along the sliding groove 601, thereby adjusting the relative height between the suction port of the sand suction pump 3 and the bottom surface of the sand collection trough 102.

[0044] The outlet end of the sand suction pump 3 is connected to one end of the rigid hose 7, and the other end of the rigid hose 7 is connected to the sand removal tank 10 via the rigid pipe 8. The sand suction pump 3 slides to the bottom of the sand collection tank 102 via the longitudinal guide rail 6, and extracts the mud and sand in the sand collection tank 102 and discharges them through the rigid hose 7 and the rigid pipe 8 in sequence. The rigid pipe 8 is fixed to the mobile cable tray 2 by pipe clamps or pipe supports, or other fixing structures such as clamps or clips can be used.

[0045] Preferably, such as Figure 2 and Figure 3 As shown, the lifting mechanism 4 includes a lifting frame 401 and an electric hoist 402 mounted on the lifting frame 401;

[0046] The top of the movable bridge 2 is provided with a first slide rail 201 along the width direction of the pool body 101. The bottom of the lifting frame 401 is set at the first slide rail 201 by the first pulley and moves along the first slide rail 201 by the second drive mechanism, that is, the lifting frame 401 moves along the length direction of the movable bridge 2.

[0047] The top of the lifting frame 401 is provided with a second slide rail 403 along the length of the pool body 101. The electric hoist 402 is set at the second slide rail 403 via a second pulley and moves along the second slide rail 403 via a third drive mechanism, that is, the electric hoist 402 moves along the width of the lifting frame 401.

[0048] Through the drive mechanism and the setting of two slide rails, the electric hoist 402 can move vertically along the width direction (Y direction) and laterally along the length direction (X direction) of the pool, so that the electric hoist 402 can cover any point on the entire pool surface and accurately position and lift the four sand suction pumps 3 on the front or rear side.

[0049] Preferably, such as Figure 5 , Figure 6 As shown, the roller 9 is fixed to the pump body 301 of the sand suction pump 3 by an annular structural member 12. The annular structural member 12 can be a traditional annular clamp type structure.

[0050] Preferably, the sand suction pump 3 is a cutting type sand suction pump to prevent clogging of the sand suction pump.

[0051] More preferably, it also includes a sand content detection unit and a control terminal, wherein the sand content detection unit, the mobile cable tray 2, the sand suction pump 3, and the lifting mechanism 4 are respectively connected to the control terminal;

[0052] The sand content detection unit is used to detect the sand content in the sewage in real time and send the data to the control terminal. Based on the sand content data fed back by the sand content detection unit, the control terminal controls the suction port height of the sand suction pump 3 in real time through the drive mechanism of the electric hoist 402. When the detected sand content is higher than the set threshold, the control terminal instructs the lifting mechanism 4 to raise the suction port of the sand suction pump 3 to avoid it being buried by the high sand layer. When the detected sand content is lower than the set threshold, the control terminal instructs the lifting mechanism 4 to lower the suction port of the sand suction pump 3 to ensure the suction efficiency.

[0053] More preferably, the sand content detection unit is an ultrasonic mud level meter or an optical turbidity sensor.

[0054] Preferably, such as Figure 5 , Figure 6 As shown, a lifting ring 302 is provided on the top of the pump body 301 of the sand suction pump 3. The lifting ring 302 is connected to the lifting device of the lifting mechanism 4 through the chain 11. When it is necessary to lift the sand suction pump 3, the lifting device tightens the chain 11 to make the sand suction pump 3 rise vertically along the slide groove 601 of the longitudinal guide rail 6. After reaching the set height, the chain 11 passes through the preset locking pin hole on the longitudinal guide rail 6 and inserts the quick pin.

[0055] The aforementioned aerated grit chamber 1 is typically designed as two rectangular chambers 101 arranged side by side (see...). Figure 1 This system forms a dual-tank parallel operation mode to balance wastewater treatment capacity, sand removal efficiency, and flexibility in inspection and maintenance. Both tanks 101 are equipped with aeration devices, and both tanks 101 have sand collection troughs 102 at their bottom. The movable bridge 2 spans the two rectangular tanks 101 and moves continuously between the two tanks.

[0056] Preferably, there are four sand suction pumps 3, which are arranged symmetrically in pairs along the front and rear sides of the movable bridge 2. In actual application, they can be flexibly activated according to the amount of sand.

[0057] Two longitudinal guide rails 6 are respectively installed on the front and rear sides of the mobile cable tray 2, corresponding to the positions of the two sand collection tanks 102. Each longitudinal guide rail 6 is equipped with a sand suction pump 3, for a total of four sand suction pumps 3, forming a "two in front and two in back, symmetrical layout of two pools": the two sand suction pumps 3 on the front side correspond to the front end of the first pool 101 and the front end of the second pool 101, respectively, and the two sand suction pumps 3 on the rear side correspond to the rear end of the first pool 101 and the rear end of the second pool 101, respectively. The four sand suction pumps 3 operate independently and can simultaneously or alternately pump the sand-water mixture in the sand collection tank 102 at the bottom of their respective pools, realizing synchronous and efficient sand removal in both pools; when any sand suction pump 3 needs maintenance, the mobile cable tray 2 can move it to the lifting position at the end of the pool, and then lift it by the lifting mechanism 4, while the other three pumps continue to work, ensuring that the system does not stop production.

[0058] The operating principle of the above embodiments:

[0059] Wastewater enters two rectangular tanks 101 arranged side by side through the inlet of the aerated grit chamber 1. Under the action of the air continuously blown in by the aeration device, a spiral flow is formed. The less dense suspended organic matter is lifted to the water surface and flows out with the water, while the denser sand particles slide into the sand collection trough 102 along the bottom slope of the tank. The movable bridge 2 moves back and forth along the length of the tank under the drive of the first drive mechanism. Four sand suction pumps 3 symmetrically arranged on the front and rear sides of the movable bridge 2 suck the sand-water mixture in the two sand collection troughs 102 into the pump chamber in real time. The sand-water mixture enters the top sand removal tank 10 through the pump outlet, rigid hose 7, and rigid pipe 8, and then the sand-water separation is completed by the subsequent sand-water separator.

[0060] When the sand content detection unit detects that the sand content is higher than the set threshold, the suction port of the sand suction pump 3 is raised by the lifting mechanism 4 to prevent the suction port of the sand suction pump 3 from being buried by the high sand layer; when the sand content detection unit detects that the sand content is lower than the set threshold, the suction port of the sand suction pump 3 is lowered by the lifting mechanism 4 to ensure the suction efficiency.

[0061] When a sand suction pump 3 needs maintenance, the mobile cable tray 2 can move it to the end of the pool, and then use the lifting mechanism 4 built into the mobile cable tray 2 to lift it vertically, so as to achieve rapid maintenance without stopping the pool. During the lifting, the electric hoist 402, under the action of the drive mechanism, lowers the lifting device and quickly lifts the sand suction pump 3 through the chain 11, and smoothly lifts it to the maintenance platform at the top of the mobile cable tray 2 along the slide 601 of the longitudinal guide rail 6. After the sand suction pump 3 has been repaired or replaced, the sand suction pump 3 can be reset along the original path of the slide 601 by reversing the operation.

[0062] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A sand removal device for an aerated grit chamber, comprising: An aerated grit chamber, a movable bridge, and a sand suction pump are provided. The aerated grit chamber includes a tank body, a sand collection trough at the bottom of the tank body, and the movable bridge at the top of the tank body. Two transverse guide rails are provided on both sides of the top of the tank body along its length, allowing the movable bridge to reciprocate along the two transverse guide rails under the drive of a first driving mechanism. The invention is characterized in that... The upper part of the movable bridge is equipped with a lifting mechanism, and the bottom of the movable bridge is equipped with a longitudinal guide rail corresponding to the position of the sand collection trough. The longitudinal guide rail is provided with a sliding groove along its length, and a roller is provided on one side of the sand suction pump inside the sliding groove. Under the action of the lifting mechanism, the roller drives the sand suction pump to slide up and down along the sliding groove, thereby adjusting the relative height between the suction port of the sand suction pump and the bottom surface of the sand collection trough. The outlet end of the sand suction pump is connected to one end of a rigid hose, and the other end of the rigid hose is connected to the sand removal tank via a rigid pipe.

2. The aerated grit chamber sand removal device according to claim 1, characterized in that, The lifting mechanism includes a lifting frame and an electric hoist mounted on the lifting frame; The top of the movable bridge is provided with a first slide rail along the width direction of the pool body, and the bottom of the lifting frame is provided with the first slide rail via a first pulley and moves along the first slide rail via a second drive mechanism; The top of the lifting frame is provided with a second slide rail along the length of the pool body. The electric hoist is set at the second slide rail via a second pulley and moves along the second slide rail via a third drive mechanism.

3. The aerated grit chamber sand removal device according to claim 1, characterized in that, The roller is fixed to the pump body of the sand suction pump by a ring-shaped structural component.

4. The aerated grit chamber sand removal device according to claim 1, characterized in that, The aerated grit chamber includes two rectangular chambers arranged side by side. The number of sand suction pumps is four, and the four sand suction pumps are arranged symmetrically in pairs along the front and rear sides of the movable bridge.

5. The aerated grit chamber sand removal device according to claim 1, characterized in that, The sand suction pump is a cutting type sand suction pump.

6. The aerated grit chamber sand removal device according to claim 1, 4, or 5, characterized in that, It also includes a sand content detection unit, which is used to detect the sand content in the wastewater; The output of the sand content detection unit is connected to the input of the control terminal, and the three outputs of the control terminal are respectively connected to the drive mechanism of the mobile bridge, the sand suction pump, and the lifting mechanism.

7. The aerated grit chamber sand removal device according to claim 6, characterized in that, The sand content detection unit is an ultrasonic mud level meter or an optical turbidity sensor.

8. The aerated grit chamber sand removal device according to claim 1, characterized in that, The top of the sand suction pump is equipped with a lifting ring, which is connected to the lifting device of the lifting mechanism via a chain.

9. The aerated grit chamber sand removal device according to claim 1, characterized in that, The rigid pipe is fixed to the movable cable tray by pipe clamps.

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