Automatic sand adding equipment for high-density sand settling tank

Abstract

The utility model relates to sewage treatment technical field provides a kind of high density sand adding equipment of sand precipitation tank, including discharge pipe, bunker and fan, the top of discharge pipe is provided with bunker, the bottom of bunker is provided with spiral machine, the rear end of discharge pipe is provided with fan, the front end of discharge pipe is respectively provided with A pipeline and B pipeline, the utility model directly adds microsand into precipitation tank by pipeline, cancels manual handling microsand step, reduces microsand leakage risk from source;Meanwhile, the whole closed sand blowing avoids dust generation, reduces the harm of dust to employee respiratory system, significantly improves the sanitary condition of pool surface, equipment and surrounding environment, creates safe and healthy working environment for employee. Through full-automatic control realizes unattended operation, only needs artificial periodic replenishment bunker microsand, substantially shortens manual handling distance and operation time. Reduce the physical labor of operation and maintenance personnel, so that they can engage in other work, significantly reduce labor cost.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to an automatic sand-adding device for a high-density sand-adding sedimentation tank. Background Technology

[0002] In the advanced treatment stage of wastewater treatment projects, the high-density sand-added sedimentation tank process is widely used due to its highly efficient solid-liquid separation capability. For example, a project with a treatment capacity of 100,000 tons / day uses this process. In this process, the addition of micro-sand is a key step in ensuring treatment effectiveness: micro-sand can enhance coagulation, promote the formation of structurally stable flocs from suspended particles in the water, accelerate the growth rate of flocs, and increase their weight, thereby significantly improving sedimentation efficiency. During continuous system operation, micro-sand is naturally lost, with a loss of approximately 1 g / m³. To maintain the circulating micro-sand concentration in the tank within a suitable range of 3-5 g / L, 100 kg of micro-sand needs to be added daily. The natural sea sand used has an average particle size of 90-110 μm. However, the current process of adding micro-sand still relies on manual operation, and there are many problems that urgently need to be solved: High labor intensity: Every day, micro-sand needs to be manually moved from the storage room to the reaction tank. The repeated back-and-forth moving process consumes a lot of manpower, resulting in extremely high labor intensity for operation and maintenance personnel. The on-site environment is harsh: due to the light weight and strong adsorption of micro-sand, it is very easy to be scattered during transportation and addition; and after micro-sand comes into contact with floor tiles or walls, especially after absorbing moisture, it will stick firmly, making it extremely difficult to clean. Long-term accumulation leads to a dirty and messy environment around the sedimentation tank. Poor mixing effect and safety hazards: Manual addition is mostly done in one concentrated session, making it difficult for the fine sand to be evenly mixed in the tank. The insufficiently mixed fine sand is prone to accumulate in the sedimentation zone, which may cause excessive starting torque of the sludge scraper over time, or even cause pipeline blockage, seriously affecting the normal operation of the sedimentation tank. Harm to employee health: The sand-adding process generates a large amount of dust. Although labor protection measures have been taken, long-term exposure to sand-containing dust environment still poses a potential threat to the respiratory system and physical health of employees. Utility Model Content

[0003] The purpose of this invention is to provide an automatic sand-adding device for a high-density sand-adding sedimentation tank. By using this device, the above-mentioned problems can be solved.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an automatic sand adding device for a high-density sand sedimentation tank, including a discharge pipe, a silo and a blower. The top of the discharge pipe is equipped with a silo, the bottom of the silo is equipped with a screw conveyor, the rear end of the discharge pipe is equipped with a blower, and the front end of the discharge pipe is equipped with pipe A and pipe B respectively. Pipe A is equipped with valve A, and pipe B is equipped with valve B.

[0005] Preferably, a silo wall vibrator is installed on the outer wall of the silo, and the outer perimeter of the silo is fixed with support legs.

[0006] Preferably, the legs are evenly spaced around the outer perimeter of the hopper, and a weighing device is installed on the legs.

[0007] Preferably, pipe A and pipe B are of the same size, and pipe A and pipe B are symmetrically distributed on both sides of the centerline at the front end of the discharge pipe.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0009] 1. The present invention provides an automatic sand adding device for a high-density sand sedimentation tank, which directly adds micro-sand to the sedimentation tank through pipelines, eliminating the step of manually handling micro-sand and reducing the risk of micro-sand leakage from the source; at the same time, the fully enclosed sand blowing avoids dust generation, reduces the harm of dust to the respiratory system of employees, significantly improves the cleanliness and hygiene of the tank surface, equipment and surrounding environment, and creates a safe and healthy working environment for employees.

[0010] 2. This utility model provides an automatic sand-adding device for a high-density sand sedimentation tank. Through fully automatic control, it achieves unattended operation, requiring only periodic manual replenishment of the fine sand in the silo, significantly reducing manual handling distances and operation time. This reduces the physical labor of maintenance personnel, allowing them to devote themselves to other tasks and significantly lowering labor costs.

[0011] 3. This utility model provides an automatic sand-adding device for a high-density sand-adding sedimentation tank. Through a screw conveyor for uniform conveying, a weighing sensor for quantity control, and a dual-pipeline independent dosing design, micro-sand can be uniformly added to the reaction tank according to a set amount, avoiding excessive waste or sludge backflow caused by untimely dosing during manual addition. Simultaneously, by monitoring the micro-sand content of the sludge and effluent indicators in real time, the dosing amount can be dynamically adjusted, greatly reducing micro-sand consumption and saving significant operating costs.

[0012] 4. This utility model provides an automatic sand-adding device for a high-density sand-adding sedimentation tank. Through preset programs, sensor linkage, and automatic alarm functions, it can fully automatically complete the sand-blowing process. It promptly alarms when the sand level in the silo is insufficient or when the equipment malfunctions, eliminating the need for real-time manual monitoring and laying a technical foundation for the intensive management of wastewater treatment plants. Furthermore, the anti-clogging design of the silo wall vibrator ensures continuous and stable operation of the equipment, reducing downtime due to malfunctions and improving overall operation and maintenance efficiency.

[0013] 5. This utility model provides an automatic sand adding device for a high-density sand adding sedimentation tank. The device supports various sand adding scenarios such as daily loss, emergency sand replenishment, and post-maintenance sand adding. The parameters can be flexibly set to meet the needs of different working conditions. The independent sand blowing function of A and B pipelines adapts to the differentiated needs of the two sedimentation tanks. Combined with the weighing feedback and vibration-assisted feeding mechanism, it ensures that the amount added each time is accurate and controllable, and comprehensively guarantees the stability of the treatment effect of the high-density sand adding sedimentation tank. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] The following are the labels in the attached diagram: 1. Discharge pipe; 2. Pipe A; 21. Valve A; 3. Pipe B; 31. Valve B; 4. Hopper; 41. Support leg; 42. Weighing device; 5. Hopper wall vibrator; 6. Screw conveyor; 7. Fan. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.

[0018] Combination Figure 1 As shown, the present invention discloses an automatic sand adding device for a high-density sand settling tank, comprising a discharge pipe 1, a silo 4, and a blower 7. The silo 4 is provided at the top of the discharge pipe 1, and a screw conveyor 6 is provided at the bottom of the silo 4. The blower 7 is provided at the rear end of the discharge pipe 1, and pipes A 2 and B 3 are provided at the front end of the discharge pipe 1. A valve 21 is provided on pipe A 2, and a valve B 31 is provided on pipe B 3.

[0019] A bin wall vibrator 5 is installed on the outer wall of the bin 4, and a support leg 41 is fixed on the outer periphery of the bin 4.

[0020] Support legs 41 are evenly spaced around the outer perimeter of the hopper 4, and weighing devices 42 are installed on the support legs 41.

[0021] Pipe A2 and pipe B3 have the same dimensions and are symmetrically distributed on both sides of the centerline at the front end of discharge pipe 1.

[0022] Specifically,

[0023] Sand Storage Unit: Silo 4 is a sand storage silo used to store a large amount of fine sand, and weighing device 42 is a weighing sensor. The sand storage silo is equipped with a weighing sensor, which can monitor the amount of fine sand stored in the silo in real time. When the amount of fine sand stored is lower than the preset value, the system will automatically issue an alarm to remind the staff to replenish the fine sand in time. The bottom of the sand storage silo is designed to be inclined and is equipped with a silo wall vibrator 5. When the sand is discharged, the silo wall vibrator 5 is activated, which can effectively prevent the fine sand from clogging the discharge port due to agglomeration or moisture, and ensure that the fine sand can flow smoothly to the conveying unit.

[0024] Conveying Unit: The conveying equipment uses air pressure differential as the driving force for conveying the micro-sand; the screw conveyor 6 is the feeding device. One end of the blower 7's outlet is tightly connected to the discharge port at the bottom of the sand storage silo, and the other end extends above the sand feeding point. The blower 7 is driven by a dedicated motor, and the conveying volume of micro-sand is controlled by adjusting the airflow and the feeding device to meet the sand feeding requirements under different working conditions. An observation window and maintenance door are also provided for convenient daily inspection of equipment operation and maintenance in case of malfunction.

[0025] Mixing Unit: At the sand addition point, the amount of sand added is controlled. The mixture is stirred in the high-density coagulation tank to thoroughly mix the fine sand, water, and reagents (PAM / PAC) to form a uniform, abundant flocculent body. By controlling the amount of sand, the concentration of the sand-water mixture can be kept stable within a suitable range, allowing the fine sand to disperse rapidly and evenly after entering the sedimentation tank.

[0026] Control Unit: The entire automatic sand adding equipment is managed centrally by the control system. The control system is based on a programmable logic controller (PLC) and uses a human-machine interface (HMI) for operation and monitoring. Operators can set various sand adding parameters on the HMI, such as the sand adding amount and the sand adding time interval. Based on preset parameters and the micro-sand storage information from the weighing sensor, the PLC automatically controls the start / stop and operation of the vibration device, the rotary feeding motor, and the valves on the water inlet pipe, achieving a fully automated sand adding process. Simultaneously, the control system also has fault diagnosis and alarm functions. When equipment malfunctions, it can promptly issue audible and visual alarm signals and display fault information on the HMI, facilitating quick troubleshooting and problem resolution for operators.

[0027] Working principle:

[0028] The outlet of pipe A2 is designated as sand blowing port A, and the outlet of pipe B3 is designated as sand blowing port B. After sand blowing is completed at port A, sand blowing is carried out at port B at intervals of 30 minutes (time is adjustable). Sand is added intermittently to prevent uneven sand addition.

[0029] The PLC uses a Siemens RS485 communication port, which enables remote control from the host computer via a communication module.

[0030] The specific implementation steps of the equipment are as follows: Step 1: Power on the system; Step 2: Use valves A 21 and B 31 to set the sand blowing volume, sand blowing interval time, and valve opening sequence. At the same time, set the blower 7 shutdown delay time, sand blowing interval time, and bin wall vibrator 5 working time. Step 3: Manually add sand to hopper 4 and weigh it; Step 4: Start the device; Step 5: Open valve A 21 or valve B 31; Step 6: Start fan 7; Step 7: Start the screw conveyor 6 and begin feeding and weighing the material until the weight reaches the set value; Step 8: Turn off the screw conveyor 6, delay turning off the fan 7, and close valve A 21 or valve B 31; Step 9: After the set time, open the valve and repeat steps 5-7 to complete the sand blowing at the other valve port.

[0031] Step 10: After the sand blowing interval, repeat steps 6-9 to complete the sand blowing of the other valve port.

[0032] Step 11: An alarm will sound after the cumulative sand blowing amount reaches the addition value, prompting the material hopper 4 to manually add sand.

[0033] Step 12: If the weight on the scale does not change during sand blowing, start the bin wall vibrator 5 and continue sand blowing. During vibration, close the discharge valve and the weighing sensor will not register the weight.

[0034] Step 13: This system is unattended and automatically completes sand blowing. After the amount of sand added to hopper 4 is blown out, an alarm will sound and sand will be added manually.

[0035] Step 14: Sand blowing port A or B can blow sand separately according to the set amount.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic sand-adding device for a high-density sand-adding sedimentation tank, comprising a discharge pipe (1), a hopper (4), and a blower (7), characterized in that: The top of the discharge pipe (1) is provided with a hopper (4), the bottom of the hopper (4) is provided with a screw conveyor (6), the rear end of the discharge pipe (1) is provided with a blower (7), the front end of the discharge pipe (1) is provided with pipe A (2) and pipe B (3), pipe A (21) is provided on pipe A (2), and pipe B (31) is provided on pipe B (3).

2. The automatic sand-adding equipment for a high-density sand-adding sedimentation tank according to claim 1, characterized in that: The outer wall of the silo (4) is equipped with a silo wall vibrator (5), and the outer periphery of the silo (4) is fixed with support legs (41).

3. The automatic sand-adding equipment for a high-density sand-adding sedimentation tank according to claim 2, characterized in that: The legs (41) are evenly spaced on the outer periphery of the hopper (4), and a weighing device (42) is provided on the legs (41).

4. The automatic sand-adding equipment for a high-density sand-adding sedimentation tank according to claim 1, characterized in that: The A pipe (2) and the B pipe (3) are the same size, and the A pipe (2) and the B pipe (3) are symmetrically distributed on both sides of the center line at the front end of the discharge pipe (1).

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