A sewage treatment device for tunnel wall maintenance

Abstract

The present application belongs to sewage treatment technical field, especially, relate to a kind of tunnel wall maintenance sewage treatment device, including treatment pond, still including: automatic dosing mechanism, sewage pH detection mechanism, synchronous quick mixing mechanism, correction mechanism, correction frequency control mechanism, follow-up detection feedback control mechanism.The present application is added by gradually changing neutralizing agent adding mode, fast in early stage and slow in later stage, can smoothly promote neutralization reaction, real-time monitoring and process control are convenient, ensure that pH value is accurately close to target value, avoid excessive or insufficient reagent;It can automatically control the initial addition speed of reagent according to the initial pH value of sewage, improve the reaction efficiency;Synchronous auxiliary stirring when adding reagent, and automatically adjust stirring power according to addition speed, ensure uniform and efficient reaction, prevent excessive stirring from affecting subsequent treatment;pH meter can also be automatically calibrated at intervals, and dynamically adjust the correction frequency according to the basicity of sewage, ensure that measurement result is accurate and reliable.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and in particular relates to a wastewater treatment device for tunnel wall maintenance. Background Technology

[0002] After the tunnel wall is constructed, cement and other cementitious materials need to be fully hydrated in a certain humidity environment to achieve strength growth and structural stability. If the wall dries too quickly, it will lead to incomplete cement hydration, resulting in problems such as cracks and insufficient strength. Maintaining the humidity of the wall by spraying water or using wet curtains can provide good conditions for cement hydration, ensuring the quality and durability of the wall. Therefore, clean water is needed in the maintenance of tunnel walls.

[0003] After the tunnel walls are cured, wastewater is generated. Due to the alkaline properties of building materials such as cement, the wastewater after tunnel wall curing is usually alkaline with a high pH value. Direct discharge of alkaline wastewater will cause alkalization of water bodies and soil, harming the ecological environment. Therefore, neutralization treatment is required to adjust the pH value to near neutral. Currently, after testing the pH value of the wastewater, the corresponding amount of neutralizing agent to be added is calculated. However, the acid-base neutralization reaction is relatively fast. If a large amount of neutralizing agent is added at the beginning, the reaction will occur violently and instantly, generating a large amount of heat in a short period of time, leading to safety problems such as local overheating and splashing. At the same time, because the reaction is too rapid, it is difficult to accurately control the reaction endpoint, which can easily lead to excessive or insufficient agent, making it difficult to accurately adjust the pH value of the wastewater to the expected range. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a wastewater treatment device for tunnel wall maintenance.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a wastewater treatment device for tunnel wall maintenance, comprising a treatment tank, and further comprising:

[0006] An automatic dosing mechanism is installed on the upper side wall of the treatment tank;

[0007] The wastewater pH testing device is fixedly installed on the automatic dosing mechanism;

[0008] A synchronous rapid mixing mechanism is installed at the bottom of the inner wall of the treatment tank;

[0009] A calibration mechanism is fixedly installed on one side of the treatment tank and is used to calibrate the wastewater pH detection mechanism.

[0010] A frequency adjustment mechanism is mounted on the calibration mechanism and is used to control the operation of the calibration mechanism;

[0011] The follow-up detection feedback control mechanism is fixedly installed on the outer wall of the treatment tank and electrically connected to the PLC controller. The PLC controller controls the action of the follow-up detection feedback control mechanism based on the pH signal fed back by the wastewater pH detection mechanism.

[0012] In the aforementioned wastewater treatment device for tunnel wall maintenance, the automatic dosing mechanism includes two longitudinal electric slide rails symmetrically and fixedly installed on the upper outer wall of the treatment tank. One end of the slider inside the two longitudinal electric slide rails is fixedly connected to the same U-shaped mounting plate. Multiple spray heads are fixedly inserted into the horizontal part of the U-shaped mounting plate. The upper ends of the multiple spray heads are fixedly connected to the same buffer pipe. One end of the buffer pipe is fixedly connected to a supply pipe. A supply pump is installed on the supply pipe. The supply pump is fixedly installed on the outer wall of the U-shaped mounting plate.

[0013] In the aforementioned wastewater treatment device for tunnel wall maintenance, the wastewater pH detection mechanism includes a rotary motor fixedly installed on the outer wall of the vertical part of the U-shaped mounting plate. A rotating plate is fixedly connected to the upper output end of the rotary motor. A vertical electric slide rail is fixedly installed on one side of the rotating plate. A support plate is fixedly connected to one end of the slider inside the vertical electric slide rail. A pH meter is fixedly inserted into the support plate. A through hole for the pH meter to extend through is opened at the upper end of the U-shaped mounting plate.

[0014] In the aforementioned wastewater treatment device for tunnel wall maintenance, the synchronous rapid mixing mechanism includes an air supply network fixedly installed at the bottom of the inner wall of the treatment tank, an air supply pump for supplying air to the air supply network fixedly installed on the outer wall of the treatment tank, a plurality of air supply cylinders rotatably connected to the upper end of the air supply network through a rotary sealing joint, a plurality of obliquely arranged jet nozzles being uniformly fixedly connected to the side wall of the air supply cylinders, and a stirring blade being fixedly connected to the upper end of the air supply cylinders.

[0015] In the aforementioned wastewater treatment device for tunnel wall maintenance, the correction mechanism includes a horizontal plate fixedly installed on the outer wall of the treatment tank. A water receiving trough is fixedly installed at the upper end of the horizontal plate. A drain pipe is fixedly connected to the side wall of the water receiving trough. Multiple electric push rods are symmetrically fixedly connected to the outer wall of the water receiving trough. The upper moving ends of the multiple electric push rods are fixedly connected to the same correction cylinder. A water guiding cavity is opened on the inner side of the upper end of the correction cylinder. Multiple flushing heads connected to the water guiding cavity are evenly fixedly connected to the inner wall of the correction cylinder. The flushing heads are inclined downwards. A flushing pipe connected to the water guiding cavity is fixedly installed on the outer wall of the correction cylinder. A flushing pump is installed on the flushing pipe. The flushing pump is fixedly installed on the outer wall of the correction cylinder.

[0016] In the aforementioned wastewater treatment device for tunnel wall maintenance, the calibration frequency control mechanism includes a trigger housing fixedly installed on the upper end of the horizontal plate. A rotating shaft is rotatably connected to the inner wall of the trigger housing. A reduction motor for driving the rotating shaft to rotate is fixedly installed at the upper end of the trigger housing. A trigger switch is fixedly installed on one side of the inner wall of the trigger housing. An arc-shaped trigger block corresponding to the position of the trigger switch is fixedly connected to the shaft wall of the rotating shaft.

[0017] In the aforementioned wastewater treatment device for tunnel wall maintenance, the follow-up detection feedback control mechanism includes a feedback shell. Multiple parallel limiting slide rods are fixedly installed on one side of the inner wall of the feedback shell. A common feedback plate is slidably sleeved on the outer wall of each of the multiple limiting slide rods. Multiple compensating springs, sleeved outside the limiting slide rods, are fixedly installed on the upper end of the feedback plate and the top of the inner wall of the feedback shell. A force-receiving permanent magnet plate is fixedly installed on the lower end of the feedback plate. A force-applying electromagnetic plate, opposite to the force-receiving permanent magnet plate, is fixedly installed on the bottom of the inner wall of the feedback shell. The inner wall of the feedback shell... A regulating resistor rod is fixedly installed parallel to the limiting slide rod. The surface of the feedback plate has a sleeve hole that fits over the regulating resistor rod, and a regulating conductive contact piece that is electrically in contact with the regulating resistor rod is fixedly connected to the inner wall of the corresponding sleeve hole. A drive screw that is parallel to the limiting slide rod is rotatably connected to one side of the inner wall of the feedback shell. A drive motor for driving the drive screw to rotate is fixedly installed on the outer wall of the feedback shell. A miniature electric actuator is fixedly inserted into one side of the feedback plate. An arc-shaped threaded plate that is threadedly engaged with the drive screw is fixedly connected to the moving end of the miniature electric actuator.

[0018] In the above-mentioned sewage treatment device for tunnel wall maintenance, a limiting slider is fixedly connected to the side wall of the feedback plate, and a limiting groove is provided on the inner wall of the feedback shell to match and slide with the limiting slider.

[0019] Compared with existing technologies, the advantages of this invention are as follows:

[0020] 1. Through the established treatment tank, automatic dosing machine, wastewater pH detection mechanism, and follow-up detection feedback control mechanism, a gradually changing neutralizing agent addition method can be adopted. The agent addition rate is fast in the early stage and gradually slows down in the later stage, so that the neutralization reaction can proceed smoothly. This facilitates real-time monitoring and control of the reaction process, ensuring that the pH value gradually approaches the target value. While ensuring the neutralization reaction rate, it avoids the problem of excessive agent addition when the pH value is close to the stable value. Furthermore, it can automatically adjust the initial agent addition rate based on the initial pH value of the wastewater, making the neutralization reaction process more efficient and precise.

[0021] 2. Through the set synchronous rapid mixing mechanism and follow-up detection feedback control mechanism, the neutralizing agent can be added simultaneously with auxiliary stirring to ensure the rate and uniformity of the neutralization reaction. The stirring power can be automatically adjusted based on the agent addition speed. The faster the agent addition speed, the greater the stirring power, so that the neutralizing agent can fully contact the wastewater, ensuring that the neutralization reaction proceeds uniformly and efficiently. At the same time, it avoids the problem that when the neutralizing agent addition speed slows down, excessive stirring will cause suspended solids in the wastewater to resuspend, affecting the subsequent sedimentation and separation process.

[0022] 3. Through the established calibration mechanism, calibration frequency control mechanism, and follow-up detection feedback control mechanism, the pH meter can be automatically calibrated at intervals to avoid drift after prolonged use, which would lead to inaccurate measurement results. Furthermore, the calibration frequency can be automatically adjusted based on the alkalinity of the wastewater. When the pH meter is in wastewater, the higher the alkalinity of the wastewater, the higher the calibration frequency, ensuring timely calibration. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0024] Figure 2 This is a frontal sectional view of the present invention;

[0025] Figure 3 This is a schematic diagram of the automatic dosing mechanism of the present invention;

[0026] Figure 4 This is a schematic diagram of the wastewater pH detection mechanism of the present invention;

[0027] Figure 5 This is a schematic diagram of the synchronous rapid mixing mechanism of the present invention;

[0028] Figure 6 yes Figure 5 A top view of the air supply cylinder structure;

[0029] Figure 7 This is a cross-sectional structural schematic diagram of the correction mechanism of the present invention;

[0030] Figure 8 This is a cross-sectional structural schematic diagram of the frequency adjustment mechanism of the present invention;

[0031] Figure 9 This is a cross-sectional structural schematic diagram of the follow-up detection feedback control mechanism of the present invention.

[0032] In the diagram: 1. Treatment tank; 2. Automatic dosing mechanism; 21. Longitudinal electric slide rail; 22. U-shaped mounting plate; 23. Spray head; 24. Buffer pipe; 25. Supply pipe; 26. Supply pump; 3. Wastewater pH detection mechanism; 31. Rotary motor; 32. Rotating plate; 33. Vertical electric slide rail; 34. Support plate; 35. pH meter; 36. Through hole; 4. Synchronous rapid mixing mechanism; 41. Air supply network; 42. Air supply pump; 43. Air supply cylinder; 44. Jet nozzle; 45. Stirring blade; 5. Calibration mechanism; 51. Horizontal plate; 52. Water receiving tank; 53. Electric push rod; 54. 55. Calibration cylinder, 56. Water guide cavity, 57. Flushing head, 58. Flushing pipe, 6. Flushing pump, 6. Calibration frequency control mechanism, 61. Trigger housing, 62. Rotating shaft, 63. Gear motor, 64. Trigger switch, 65. Arc-shaped trigger block, 7. Follow-up detection feedback control mechanism, 71. Feedback housing, 72. Limiting slide bar, 73. Feedback plate, 74. Compensation spring, 75. Force-bearing permanent magnet plate, 76. Force-applying electromagnetic plate, 77. Controlling resistor rod, 78. Controlling conductive contact plate, 79. Drive screw, 710. Drive motor, 711. Miniature electric actuator, 712. Arc-shaped threaded plate. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0034] like Figures 1-9 As shown, a wastewater treatment device for tunnel wall maintenance includes a treatment tank 1, and further includes:

[0035] Automatic dosing mechanism 2 is installed on the upper side wall of treatment tank 1. Automatic dosing mechanism 2 includes two longitudinal electric slide rails 21 that are symmetrically fixedly installed on the upper outer wall of treatment tank 1. One end of the slider in the two longitudinal electric slide rails 21 is fixedly connected to the same U-shaped mounting plate 22. Multiple spray heads 23 are fixedly inserted into the horizontal part of the U-shaped mounting plate 22. The upper end of the multiple spray heads 23 is fixedly connected to the same buffer pipe 24. One end of the buffer pipe 24 is fixedly connected to the supply pipe 25. A supply pump 26 is installed on the supply pipe 25. The supply pump 26 is fixedly installed on the outer wall of the U-shaped mounting plate 22.

[0036] Wastewater pH detection mechanism 3 is fixedly installed on automatic dosing mechanism 2. Wastewater pH detection mechanism 3 includes a rotary motor 31 fixedly installed on the outer wall of the vertical part of U-shaped mounting plate 22. The upper output end of rotary motor 31 is fixedly connected to a rotating plate 32. A vertical electric slide rail 33 is fixedly installed on one side of rotating plate 32. A support plate 34 is fixedly connected to one end of the slider inside vertical electric slide rail 33. A pH meter 35 is fixedly inserted on support plate 34. A through hole 36 is opened at the upper end of U-shaped mounting plate 22 for pH meter 35 to pass through and protrude.

[0037] The synchronous rapid mixing mechanism 4 is installed at the bottom of the inner wall of the treatment tank 1. The synchronous rapid mixing mechanism 4 includes an air supply network 41 fixedly installed at the bottom of the inner wall of the treatment tank 1. An air supply pump 42 for supplying air to the air supply network 41 is fixedly installed on the outer wall of the treatment tank 1. The upper end of the air supply network 41 is rotatably connected to multiple air supply cylinders 43 through a rotary sealing joint. Multiple obliquely arranged jet nozzles 44 are evenly fixedly connected to the side wall of the air supply cylinders 43. A stirring blade 45 is fixedly connected to the upper end of the air supply cylinders 43.

[0038] The calibration mechanism 5 is fixedly installed on one side of the treatment tank 1 and is used to calibrate the wastewater pH detection mechanism 3. The calibration mechanism 5 includes a horizontal plate 51 fixedly installed on the outer wall of the treatment tank 1. A water receiving trough 52 is fixedly installed on the upper end of the horizontal plate 51. A drain pipe is fixedly connected to the side wall of the water receiving trough 52. Multiple electric push rods 53 are symmetrically fixedly connected to the outer wall of the water receiving trough 52. The upper moving ends of the multiple electric push rods 53 are fixedly connected to the same calibration cylinder 54. A water guiding cavity 55 is opened on the inner side of the upper end of the calibration cylinder 54. Multiple flushing heads 56 connected to the water guiding cavity 55 are evenly fixedly connected to the inner wall of the calibration cylinder 54. The flushing heads 56 are inclined downward. A flushing pipe 57 connected to the water guiding cavity 55 is fixedly installed on the outer wall of the calibration cylinder 54. A flushing pump 58 is installed on the flushing pipe 57. The flushing pump 58 is fixedly installed on the outer wall of the calibration cylinder 54.

[0039] The frequency adjustment mechanism 6 is installed on the adjustment mechanism 5 and is used to control the operation of the adjustment mechanism 5. The frequency adjustment mechanism 6 includes a trigger housing 61 fixedly installed on the upper end of the horizontal plate 51. A rotating shaft 62 is rotatably connected to the inner wall of the trigger housing 61. A reduction motor 63 for driving the rotating shaft 62 to rotate is fixedly installed at the upper end of the trigger housing 61. A trigger switch 64 is fixedly installed on one side of the inner wall of the trigger housing 61. An arc-shaped trigger block 65 corresponding to the position of the trigger switch 64 is fixedly connected to the shaft wall of the rotating shaft 62.

[0040] A follow-up detection feedback control mechanism 7 is fixedly installed on the outer wall of the treatment tank 1 and electrically connected to a PLC controller. The PLC controller controls the action of the follow-up detection feedback control mechanism 7 based on the pH signal fed back by the wastewater pH detection mechanism 3. The follow-up detection feedback control mechanism 7 includes a feedback shell 71. Multiple parallel limit slide rods 72 are fixedly installed on one side of the inner wall of the feedback shell 71. The outer wall of the multiple limit slide rods 72 is slidably sleeved with the same feedback plate 73. Multiple compensation springs 74 sleeved on the limit slide rods 72 are fixedly installed on the upper end of the feedback plate 73 and the top of the inner wall of the feedback shell 71. A force-bearing permanent magnet plate 75 is fixedly installed on the lower end of the feedback plate 73. An amplifying electromagnetic plate 76 opposite to the force-bearing permanent magnet plate 75 is fixedly installed on the bottom of the inner wall of the feedback shell 71. A regulating resistor 77 is fixedly installed on the wall and is arranged parallel to the limiting slide rod 72. A sleeve hole is opened on the surface of the feedback plate 73, which is sleeved on the outside of the regulating resistor 77. A regulating conductive contact piece 78 that is electrically in contact with the regulating resistor 77 is fixedly connected to the inner wall of the corresponding sleeve hole. A drive screw 79 that is arranged parallel to the limiting slide rod 72 is also rotatably connected to one side of the inner wall of the feedback shell 71. A drive motor 710 for driving the drive screw 79 to rotate is fixedly installed on the outer wall of the feedback shell 71. A miniature electric push rod 711 is fixedly inserted on one side of the feedback plate 73. An arc-shaped threaded plate 712 that is threaded with the drive screw 79 is fixedly connected to the moving end of the miniature electric push rod 711. A limiting slider is fixedly connected to the side wall of the feedback plate 73. A limiting groove that matches and slides with the limiting slider is opened on the inner wall of the feedback shell 71.

[0041] The operating principle of the present invention is described as follows: the wastewater to be treated is introduced into the treatment tank 1, and the PLC controller controls the vertical electric slide rail 33 to drive the pH meter 35 to move down, so that the lower end of the pH meter 35 passes through the through hole 36 on the U-shaped mounting plate 22 and extends into the treatment tank 1 to detect the pH value of the wastewater.

[0042] The PLC controller then controls the power supply to supply power to the force-applying electromagnetic plate 76 based on the pH value data fed back by the pH meter 35. The force-applying electromagnetic plate 76 generates the same magnetism as the force-bearing permanent magnet plate 75, which in turn drives the feedback plate 73 to move upward along the limit slide bar 72 against the elastic force of the compensation spring 74. The feedback plate 73 drives the regulating conductive contact 78 to move upward synchronously on the regulating resistor bar 77. Specifically, the higher the alkalinity of the wastewater, the greater the current supplied by the power supply to the force-applying electromagnetic plate 76 by the PLC controller, which makes the feedback plate 73 move upward a greater distance and the resistance of the regulating resistor bar 77 smaller. After maintaining the power supply to the force-applying electromagnetic plate 76 for 5 seconds to make the position of the feedback plate 73 stable, the PLC controller then controls the micro electric push rod 711 to push the arc-shaped threaded plate 712 to move, so that the arc-shaped threaded plate 712 and the drive screw 79 are threaded together. At this time, the PLC controller controls the power supply to cut off the power supply to the force-applying electromagnetic plate 76.

[0043] The PLC controller then controls the automatic dosing mechanism 2. The longitudinal electric slide rail 21 can adjust the longitudinal position of the spray head 23. The dosing pump 26, in conjunction with the dosing pipe 25, draws neutralizing agent from the external storage tank and delivers it to the buffer pipe 24. The neutralizing agent is then sprayed out through multiple spray heads 23, allowing it to neutralize the alkaline wastewater. During the dosing process, the PLC controller controls the drive motor 710 to operate synchronously. The drive motor 710 drives the drive screw 79 to rotate. Through the threaded engagement of the drive screw 79 and the arc-shaped threaded plate 712, the feedback plate 73 drives the regulating conductive contact 78 to move synchronously downward on the regulating resistor rod 77. Specifically, the regulating conductive contact 78 and the regulating resistor rod 77 are connected in series in the power supply circuit of the dosing pump 26 (the series connection is existing technology and will not be elaborated here). When the initial alkalinity of the wastewater... The larger the value, the smaller the resistance of the regulating resistor 77, resulting in a larger supply current to the chemical supply pump 26 and a larger working power of the chemical supply pump 26. This leads to a faster addition rate of the neutralizing agent during the initial neutralization reaction. As the regulating conductive contact 78 continues to move on the regulating resistor 77, the resistance of the regulating resistor 77 increases, causing the addition rate of the neutralizing agent to gradually decrease. The pH meter 35 monitors the pH value of the wastewater in real time until the set value is reached, at which point the automatic dosing mechanism 2 stops working. Initially increasing the dosing rate ensures the neutralization reaction rate. When the acidity or alkalinity of the wastewater gradually approaches the target value, the amount of agent added is more precisely controlled. At this time, the agent can be added continuously and slowly based on the real-time detection results, so that the acidity or alkalinity of the wastewater can accurately reach and stabilize within the target range, avoiding over-adjustment.

[0044] During the automatic dosing process, the PLC controller controls the air supply pump 42 to work synchronously. The air supply pump 42 supplies air to the air supply network 41. The air enters the air supply cylinder 43 and is ejected through multiple nozzles 44. Because the multiple nozzles 44 are set at an angle, the air supply cylinder 43 is subjected to rotational force, which in turn drives the stirring blades 45 to rotate and stir in the treatment tank 1, promoting better and more uniform combination of the neutralizing agent and the sewage, and accelerating the neutralization reaction rate. In addition, the air ejected from the nozzles 44 can stir and roll the bottom of the treatment tank 1, further promoting the integrity and uniformity of the neutralization reaction and improving the quality of the neutralization reaction. Furthermore, the regulating conductive contact 78 and the regulating resistor 77 are connected in series in the power supply circuit of the air supply pump 42. The air supply pump 42 is a DC pump. When the resistance of the regulating resistor 77 is small, the corresponding neutralizing agent is added. The acceleration is fast, and the working power of the air supply pump 42 is increased simultaneously, thereby providing a greater stirring force to ensure the complete reaction of the neutralizing agent. When a large amount of neutralizing agent is added to the sewage, a stronger stirring force is required to disperse the agent quickly and evenly in the sewage. Increasing the stirring power can increase the flow rate and turbulence of the liquid, allowing the neutralizing agent to fully contact the sewage and avoiding situations where the local concentration of the agent is too high or too low. This ensures that the neutralization reaction is carried out evenly and efficiently throughout the sewage tank. When the agent addition rate is low, the stirring power is automatically reduced. Under the premise of ensuring sufficient stirring force to promote the mixing reaction, excessive stirring is avoided, which may cause suspended solids in the sewage to resuspend, affecting the subsequent sedimentation and separation process. It will also increase energy consumption and equipment wear, and reduce the economy and stability of the treatment system.

[0045] While the pH meter 35 is detecting the acidity or alkalinity of the wastewater, the PLC controller synchronously controls the geared motor 63 to operate. The geared motor 63 drives the rotating shaft 62 to move the arc-shaped trigger block 65 within the trigger housing 61 until the arc-shaped trigger block 65 presses against the trigger switch 64. At this point, the PLC controller first pauses the wastewater treatment process and controls the vertical electric slide rail 33 to move the pH meter 35 upwards. Then, the rotary motor 31 rotates the pH meter 35 to the upper side of the calibration mechanism 5. Next, the vertical electric slide rail 33 moves the pH meter 35 downwards into the calibration cylinder 54. During the downward movement of the pH meter 35, the flushing pump 58, in conjunction with the flushing pipe 57, delivers external neutralized water to the water guide chamber 55, which then passes through multiple flushing cycles. The shampoo spray 56 first rinses and cleans the surface of pH meter 35 to prevent dirt and solution adhering to the surface of pH meter 35 from affecting the accuracy of subsequent calibration. When pH meter 35 moves into position, it means that the surface of pH meter 35 has also been rinsed and cleaned. At this time, electric push rod 53 drives calibration cylinder 54 to move down, so that the bottom end of calibration cylinder 54 is in sealed contact with water tank 52, so that the bottom of calibration cylinder 54 forms a closed structure. Then, flushing pump 58 supplies neutralizing water for 5 seconds, so that the neutralizing water can fill calibration cylinder 54 and make full contact with pH meter 35. After waiting for 10 seconds for the displayed value of pH meter 35 to stabilize, automatic calibration is performed using the built-in calibration module of pH meter 35 to complete the calibration work.

[0046] Furthermore, the regulating conductive contact 78 and the regulating resistor 77 are connected in series in the power supply circuit of the geared motor 63. The geared motor 63 is a DC motor. When the pH meter 35 is located in sewage and the alkalinity of the sewage is higher, resulting in a lower resistance value of the regulating resistor 77, the power supply current of the geared motor 63 is higher. This causes the geared motor 63 to drive the arc-shaped trigger block 65 to move at a higher speed, shortening the interval between the trigger switch 64 being pressed and triggering the pH meter 35, thus increasing the triggering frequency and consequently increasing the calibration frequency of the pH meter 35. This is because highly alkaline sewage has a greater impact on the electrodes of the pH meter 35. The high concentration of hydroxide ions in the alkaline solution can react with the sensitive membrane on the surface of the pH meter 35 electrode, or form a layer of alkaline substance on the membrane surface, affecting the response speed and accuracy of the electrode. In this case, more frequent calibration of the pH meter 35 can detect changes in electrode performance in a timely manner and eliminate these effects as much as possible through calibration, ensuring the accuracy of the measurement. If the calibration frequency is not increased, the measurement error of the pH meter 35 electrode will gradually increase, leading to misjudgment of the reaction process.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wastewater treatment device for tunnel wall maintenance, comprising a treatment tank (1), characterized in that, Also includes: An automatic dosing mechanism (2) is installed on the upper side wall of the treatment tank (1); Wastewater pH testing device (3) is fixedly installed on the automatic dosing device (2); A synchronous rapid mixing mechanism (4) is installed at the bottom of the inner wall of the treatment tank (1); The calibration mechanism (5) is fixedly installed on one side of the treatment tank (1) and is used to calibrate the wastewater pH detection mechanism (3); A frequency adjustment mechanism (6) is installed on the calibration mechanism (5) and is used to control the operation of the calibration mechanism (5); The follow-up detection feedback control mechanism (7) is fixedly installed on the outer wall of the treatment tank (1) and electrically connected to the PLC controller. The PLC controller controls the action of the follow-up detection feedback control mechanism (7) based on the pH signal fed back by the sewage pH detection mechanism (3). The automatic dosing mechanism (2) includes two longitudinal electric slide rails (21) symmetrically fixedly installed on the upper outer wall of the treatment tank (1). One end of the slider in the two longitudinal electric slide rails (21) is fixedly connected to the same U-shaped mounting plate (22). Multiple spray heads (23) are fixedly inserted into the horizontal part of the U-shaped mounting plate (22). The upper ends of the multiple spray heads (23) are fixedly connected to the same buffer pipe (24). One end of the buffer pipe (24) is fixedly connected to the supply pipe (25). A supply pump (26) is installed on the supply pipe (25). The supply pump (26) is fixedly installed on the outer wall of the U-shaped mounting plate (22). The wastewater pH testing mechanism (3) includes a rotary motor (31) fixedly installed on the outer wall of the vertical part of the U-shaped mounting plate (22). The upper output end of the rotary motor (31) is fixedly connected to a rotating plate (32). A vertical electric slide rail (33) is fixedly installed on one side of the rotating plate (32). A support plate (34) is fixedly connected to one end of the slider inside the vertical electric slide rail (33). A pH meter (35) is fixedly inserted on the support plate (34). A through hole (36) for the pH meter (35) to extend through is opened at the upper end of the U-shaped mounting plate (22). The synchronous rapid mixing mechanism (4) includes an air supply network (41) fixedly installed at the bottom of the inner wall of the treatment tank (1). An air supply pump (42) for supplying air to the air supply network (41) is fixedly installed on the outer wall of the treatment tank (1). The upper end of the air supply network (41) is rotatably connected to multiple air supply cylinders (43) through a rotary sealing joint. Multiple obliquely arranged jet nozzles (44) are evenly fixedly connected to the side wall of the air supply cylinders (43). A stirring blade (45) is fixedly connected to the upper end of the air supply cylinders (43).

2. The wastewater treatment device for tunnel wall maintenance according to claim 1, characterized in that, The calibration mechanism (5) includes a horizontal plate (51) fixedly installed on the outer wall of the treatment tank (1). A water receiving trough (52) is fixedly installed on the upper end of the horizontal plate (51). A drain pipe is fixedly connected to the side wall of the water receiving trough (52). Multiple electric push rods (53) are symmetrically fixedly connected to the outer wall of the water receiving trough (52). The upper moving end of the multiple electric push rods (53) is fixedly connected to the same calibration cylinder (54). A water guiding cavity (55) is opened on the inner side of the upper end of the calibration cylinder (54). Multiple flushing heads (56) connected to the water guiding cavity (55) are evenly fixedly connected to the inner wall of the calibration cylinder (54). The flushing heads (56) are inclined downward. A flushing pipe (57) connected to the water guiding cavity (55) is fixedly installed on the outer wall of the calibration cylinder (54). A flushing pump (58) is installed on the flushing pipe (57). The flushing pump (58) is fixedly installed on the outer wall of the calibration cylinder (54).

3. The wastewater treatment device for tunnel wall maintenance according to claim 2, characterized in that, The frequency correction mechanism (6) includes a trigger housing (61) fixedly installed on the upper end of the horizontal plate (51). The inner wall of the trigger housing (61) is rotatably connected to a rotating shaft (62). The upper end of the trigger housing (61) is fixedly installed with a reduction motor (63) for driving the rotating shaft (62) to rotate. A trigger switch (64) is fixedly installed on one side of the inner wall of the trigger housing (61). The shaft wall of the rotating shaft (62) is fixedly connected with an arc-shaped trigger block (65) corresponding to the position of the trigger switch (64).

4. The wastewater treatment device for tunnel wall maintenance according to claim 1, characterized in that, The follow-up detection feedback control mechanism (7) includes a feedback shell (71). Multiple parallel limiting slide rods (72) are fixedly installed on one side of the inner wall of the feedback shell (71). A single feedback plate (73) is slidably sleeved on the outer wall of each of the multiple limiting slide rods (72). Multiple compensating springs (74) sleeved outside the limiting slide rods (72) are fixedly installed on the upper end of the feedback plate (73) and the top of the inner wall of the feedback shell (71). A force-bearing permanent magnet plate (75) is fixedly installed on the lower end of the feedback plate (73). A force-applying electromagnetic plate (76) is fixedly installed on the bottom of the inner wall of the feedback shell (71) opposite to the force-bearing permanent magnet plate (75). A plate parallel to the limiting slide rods (72) is fixedly installed on the inner wall of the feedback shell (71). The feedback plate (73) has a control resistor rod (77) arranged in a row. The surface of the feedback plate (73) has a sleeve hole that is sleeved on the control resistor rod (77). The inner wall of the sleeve hole is fixedly connected to a control conductive contact piece (78) that is electrically in contact with the control resistor rod (77). The inner wall of the feedback shell (71) is also rotatably connected to a drive screw (79) that is parallel to the limit slide rod (72). The outer wall of the feedback shell (71) is fixedly installed with a drive motor (710) for driving the drive screw (79) to rotate. A miniature electric push rod (711) is fixedly inserted on one side of the feedback plate (73). The moving end of the miniature electric push rod (711) is fixedly connected to an arc-shaped threaded plate (712) that is threaded with the drive screw (79).

5. A wastewater treatment device for tunnel wall maintenance according to claim 4, characterized in that, The side wall of the feedback plate (73) is fixedly connected to a limiting slider, and the inner wall of the feedback shell (71) is provided with a limiting groove that matches and slides with the limiting slider.

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