Accumulated sand hardening prevention device for grit chamber

Abstract

The utility model discloses an accumulated sand hardening prevention device for a grit chamber, which belongs to the technical field of sewage treatment equipment and comprises a lifting aeration component and an aeration air source device. The liftable aeration assembly is mounted on the grit chamber working bridge through a lifting device and structurally comprises an aeration device connecting pipe, an annular pipe arranged at the lower end of the aeration device connecting pipe and a plurality of aeration pipes vertically downward from the annular pipe. The aeration air source device is provided with at least two air outlet connecting ends with a height difference, and the upper end of the aeration device connecting pipe can be detached and selectively connected to any one of the air outlet connecting ends according to requirements, so that the operation depth of the aeration assembly in the grit chamber is adjusted. And when the sand accumulation is serious, the aeration assembly can be lowered to a deeper position, so that the hardened accumulated sand can be effectively crushed, and the continuous and stable operation of the grit chamber is ensured.

Description

Technical Field

[0001] This utility model relates to the field of sewage treatment equipment technology, and in particular to a device for preventing sand accumulation and caking in a grit chamber. Background Technology

[0002] In municipal and industrial wastewater treatment processes, grit chambers are a crucial pretreatment unit. Their main function is to remove denser inorganic particles (such as sand, gravel, and cinders) from wastewater using gravity separation principles. This prevents wear and blockage of subsequent treatment equipment (such as pumps and pipes) and reduces the load on subsequent biological treatment units. Swirl grit chambers are widely used due to their small footprint and high grit removal efficiency.

[0003] To improve sand removal efficiency and separate sand from organic matter, existing vortex grit chambers are typically equipped with aeration and sand removal systems. For example, a Chinese utility model patent (authorization announcement number: CN2255302Y) discloses a "vortex aeration sand removal device". This device has aeration pipes distributed along the pool wall in the middle of the pool to enhance the vortex effect of water; in the sand hopper at the bottom, there is a fixed air jet pipe (7) and an air lift sand removal pump (5). Its working method is that before sand is pumped out, air is supplied to the sand hopper through the fixed air jet pipe (7) to agitate and loosen the accumulated sand, and then the sand-water mixture is pumped out by the air lift sand removal pump (5).

[0004] However, the aforementioned existing technology has obvious drawbacks in practical applications: First, the air-flushing pipe (7) used for loosening accumulated sand is fixedly installed, and its air-flushing range is limited, easily forming flushing blind spots in the corners or non-central areas of the sand hopper, resulting in some accumulated sand not being effectively loosened. Second, once the accumulated sand becomes severely compacted, exceeding the processing capacity of the air-flushing pipe (7) and the air-lift sand removal pump (5), the entire sand removal system will be paralyzed. At this time, the only solution is to shut down and empty the sedimentation tank, and then have people manually enter the bottom of the tank to carry out arduous crushing and cleaning work. This not only seriously affects the normal continuous production of the sewage treatment plant, but also consumes a lot of manpower and resources, and poses safety risks. Utility Model Content

[0005] The purpose of this utility model is to provide a device for preventing sand accumulation and caking in sedimentation tanks, so as to solve the technical problems of sand accumulation and caking and system paralysis caused by the fixed structure of the sand cleaning device and the inability to adjust the flushing range in the existing technology.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a device for preventing sand accumulation and caking in a sedimentation tank, installed on the working bridge of the sedimentation tank, comprising:

[0007] Aeration device connecting pipe;

[0008] An annular pipe is installed at the lower end of the connecting pipe of the aeration device;

[0009] At least two aeration pipes are vertically downwardly arranged on the annular pipe;

[0010] An aeration air source device, wherein the aeration air source device is provided with at least two air outlet connection ends with a height difference;

[0011] A lifting device connecting the working bridge and the aeration device connecting pipe;

[0012] The lifting device is used to drive the aeration device connecting pipe, annular pipe and aeration pipe to achieve overall vertical lifting; the upper end of the aeration device connecting pipe is detachably and selectively connected to any air outlet connection end of the aeration air source device.

[0013] Furthermore, the lifting device includes a mounting base fixed to the working bridge, a guide sleeve disposed on the mounting base, a connecting block welded to the connecting pipe of the aeration device, and a hand crank screw threaded through the guide sleeve and pulsatorically connected to the connecting block.

[0014] Furthermore, the lifting device also includes a bearing seat mounted on the connecting block, and the lower end of the hand crank screw is inserted into the bearing seat.

[0015] Furthermore, the aeration gas source device includes a Roots blower for generating compressed gas and a main air pipe connected to the Roots blower, and the outlet connection end is an upper air source interface and a lower air source interface respectively provided on the main air pipe.

[0016] Furthermore, the annular tube is composed of two C-shaped tubes connected by a flange.

[0017] Furthermore, the end of the aeration pipe is provided with a flat nozzle.

[0018] Furthermore, the aeration device connecting pipe, the annular pipe, and the aeration pipe are all made of stainless steel.

[0019] Furthermore, the main gas pipe is equipped with a solenoid valve for controlling the main gas supply switch.

[0020] Furthermore, the upper and lower air source interfaces are connected to the main air pipe via ball valves to control the on / off state.

[0021] Furthermore, the vertical height difference between the upper air source interface and the lower air source interface is 50cm.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] This invention achieves two core operating modes by setting two air outlet connection ends with a height difference and cooperating with a height-adjustable aeration component. When connected to the upper air source interface, the reference operating height of the aeration component is higher, mainly acting on the upper layer of sand accumulation, suitable for daily, preventative anti-caking and loosening operations. When deep sand accumulation needs to be treated, it can be switched to the lower air source interface, lowering the reference operating height of the aeration component to penetrate into the middle and lower layers of sand accumulation for powerful flushing. This design, which allows for selection of different operating depths according to working conditions, solves the problem that existing fixed devices cannot cope with changing working conditions.

[0024] By fine-tuning the lifting device and switching between two different height interfaces, the aeration component can completely cover the entire area from the top to the bottom of the sand hopper. This all-around coverage effectively eliminates the blind spots in washing caused by the fixed structure of existing technologies, ensuring thorough sand removal.

[0025] Because this device can flexibly adjust its position according to the accumulation of sand, it effectively prevents and treats existing caking, thus avoiding the paralysis of the entire sand removal system due to blockage. This eliminates the need for costly and high-risk maintenance operations such as production shutdowns, emptying, and manual sand cleaning, effectively ensuring the continuous and stable operation of the sedimentation tank. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the anti-sand accumulation and caking device for sedimentation tanks of this utility model;

[0027] Figure 2 This is a schematic diagram of the aeration air source device of this utility model;

[0028] Figure 3 This is a schematic diagram of the lifting device of this utility model;

[0029] Figure 4 This is a schematic diagram of the aeration device of this utility model;

[0030] Figure 5 This is a partial enlarged view of the end of the aeration pipe of this utility model.

[0031] In the diagram: 1. Roots blower; 2. Main air pipe; 3. Upper air source interface; 4. Lower air source interface; 5. Aeration device connecting pipe; 6. Ring pipe; 7. Aeration pipe; 8. Lifting device; 801. Mounting base; 802. Guide sleeve; 803. Hand crank screw; 804. Connecting block; 805. Bearing seat; 9. Working bridge. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] Please see Figures 1 to 5 This utility model provides a device for preventing sand accumulation and caking in a sedimentation tank. The entire device is installed on a working bridge 9 above the sedimentation tank. The working bridge 9 is a platform spanning the top of the sedimentation tank, used for installing specialized equipment and also serving as a work platform for manual operations. The device mainly consists of an aeration air source device, a set of liftable aeration components, and a lifting device 8. The lifting device 8 is used to install the aeration components on the working bridge 9 and adjust their vertical height. The aeration air source device acts as a power source, providing high-pressure air to the aeration components, which act as actuators, penetrating deep into the sedimentation tank to flush away accumulated sand.

[0037] Please see Figure 2The aeration air source device includes a Roots blower 1 (its mounting platform can be a working bridge 9, or a separate dedicated platform), which serves as the power source for generating compressed air. The outlet of the Roots blower 1 is connected to a main air pipe 2 via a pipeline. To achieve precise control of the air source, preferably, a solenoid valve can be installed on the main air pipe 2 for remote or automatic control of the main air source switch. The end of the main air pipe 2 is provided with two outlet connection ends with a fixed vertical height difference, namely, the upper air source interface 3 at a higher position and the lower air source interface 4 at a lower position. In this preferred embodiment, the height difference between the two interfaces is 50cm, which aims to provide two reference connection points at different heights, thereby quickly switching the macroscopic operating depth of the aeration component. Ball valves are installed on both the upper air source interface 3 and the lower air source interface 4 to adjust the opening or closing degree of the air source interface. Standard flanges are provided at the ends of both the upper air source interface 3 and the lower air source interface 4 to facilitate quick and detachable connection of the aeration component.

[0038] Please see Figure 3 The fixed part of the lifting device 8 is a mounting base 801, which is firmly fixed to the steel section of the working bridge 9 by bolts or other means. The mounting base 801 has an integral or separate guide sleeve 802, which has internal threads that mate with the hand crank screw 803. The hand crank screw 803 is vertically positioned, and its threaded portion passes through and engages with the guide sleeve 802. A connecting block 804 is fixedly connected to the wall of the aeration device connecting pipe 5 by welding. To achieve smooth lifting and lowering and prevent unnecessary rotation of the aeration assembly during adjustment, a bearing seat 805 is installed on the connecting block 804. The lower end of the smooth rod of the hand crank screw 803 is inserted into this bearing seat 805 and connected to it for transmission. When the operator turns the handwheel at the top of the hand crank screw 803, the screw undergoes vertical displacement due to thread engagement with the fixed guide sleeve 802. This displacement is transmitted to the aeration device connecting pipe 5 through the bearing seat 805 and the connecting block 804, thereby driving the entire aeration assembly to rise or fall. The application of bearing housing 805 allows the lead screw to rotate freely, while the connecting block 804 and aeration components connected to it only perform pure up-and-down linear motion, ensuring the stability and accuracy of the adjustment process.

[0039] Please see Figure 4 and Figure 5The aeration assembly mainly consists of a long rod-shaped aeration device connecting pipe 5 and its lower end aeration pipeline. The aeration pipeline includes an annular pipe 6, whose function is to evenly distribute the air to each action point. For ease of manufacturing, on-site installation, and internal cleaning, this annular pipe 6 is preferably made of two C-shaped pipes joined together by flanges. Around the circumference of the annular pipe 6, at least two (in this embodiment, four) vertically downward aeration pipes 7 are welded at even intervals. This uniform layout ensures that the scouring range can cover the central area of ​​the sand hopper 360 degrees without dead angles. To maximize the scouring effect of the high-pressure air, each aeration pipe 7 has a flat nozzle at its end, as shown in the enlarged view. Figure 5 As shown. This nozzle can shape the airflow into a fan shape, increasing the effective area and improving the efficiency of breaking up compacted sand blocks. In addition, considering the highly corrosive nature of the wastewater environment, all water-contacting components of the aeration device, such as the connecting pipe 5, the annular pipe 6, and the aeration pipe 7, are preferably made of stainless steel to ensure the long-term stable operation and service life of the device.

[0040] The specific working process of this utility model is as follows: In daily operation, to prevent newly settled gravel from caking, the device operates in "daily anti-caking mode". At this time, the flange at the upper end of the aeration device connecting pipe 5 is connected and fixed to the upper air source interface 3, which is located higher. By operating the lifting device 8, the aeration assembly is finely adjusted to a higher working height, for example, so that the nozzle of its aeration pipe 7 is above the mixing blades. According to the preset program or manual operation, the Roots blower 1 and the corresponding valves are turned on at regular intervals to aerate the surface sand and keep it fluid. When it is necessary to deal with sand that has accumulated to a thicker thickness or shows signs of caking, the device switches to "powerful caking breaking mode". First, the operator lowers the entire aeration assembly by turning the hand crank screw 803 so that the nozzle of its aeration pipe 7 can penetrate into the middle and lower part of the sand layer. Then, the flange is loosened, the aeration device connecting pipe 5 is disconnected from the upper air source interface 3, and then connected and tightened to the lower air source interface 4, which is located lower. Because the connection point is lowered by 50cm, the overall operating depth of the aeration unit is also significantly reduced, allowing it to directly target the core area with the most severe compaction. When the air source is activated, high-pressure air is forcefully ejected from nozzles deep within the sand layer, directly and efficiently breaking up and loosening the hardened sand blocks until they regain fluidity and can be smoothly discharged by the subsequent sand removal system. After the operation is completed, the device is returned to its normal operating mode. Through this adjustment, precise and efficient treatment of different sand accumulation conditions within the grit chamber is achieved.

[0041] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A device for preventing sand accumulation and caking in a sedimentation tank, installed on the working bridge (9) of the sedimentation tank, characterized in that, include: Aeration device connecting pipe (5); The annular pipe (6) is installed at the lower end of the connecting pipe (5) of the aeration device. At least two aeration pipes (7) are vertically downwardly arranged on the annular pipe (6); An aeration air source device, wherein the aeration air source device is provided with at least two air outlet connection ends with a height difference; A lifting device (8) is connected between the working bridge (9) and the aeration device connecting pipe (5); The lifting device (8) is used to drive the aeration device connecting pipe (5), the annular pipe (6) and the aeration pipe (7) to achieve overall vertical lifting; the upper end of the aeration device connecting pipe (5) is detachably and selectively connected to any air outlet connection end of the aeration air source device.

2. The apparatus according to claim 1, characterized in that, The lifting device (8) includes a mounting base (801) fixed on the working bridge (9), a guide sleeve (802) provided on the mounting base (801), a connecting block (804) welded to the aeration device connecting pipe (5), and a hand crank screw (803) threaded through the guide sleeve (802) and connected to the connecting block (804) in a transmission manner.

3. The apparatus according to claim 2, characterized in that, The lifting device (8) also includes a bearing seat (805) mounted on the connecting block (804), and the lower end of the hand crank screw (803) is inserted into the bearing seat (805).

4. The apparatus according to claim 1, characterized in that, The aeration gas source device includes a Roots blower (1) for generating compressed gas and a main air pipe (2) connected to the Roots blower (1). The outlet connection end is an upper air source interface (3) and a lower air source interface (4) respectively provided on the main air pipe (2).

5. The apparatus according to claim 1, characterized in that, The annular pipe (6) is composed of two C-shaped pipes connected by a flange.

6. The apparatus according to claim 1, characterized in that, The aeration pipe (7) is equipped with a flat nozzle at its end.

7. The apparatus according to claim 1, characterized in that, The aeration device connecting pipe (5), the annular pipe (6) and the aeration pipe (7) are all made of stainless steel.

8. The apparatus according to claim 4, characterized in that, The main gas pipe (2) is equipped with a solenoid valve for controlling the main gas source switch.

9. The apparatus according to claim 4, characterized in that, The upper air source interface (3) and the lower air source interface (4) are connected to the main air pipe (2) by ball valves.

10. The apparatus according to claim 4, characterized in that, The vertical height difference between the upper air source interface (3) and the lower air source interface (4) is 50cm.

Images