High-precision laser sludge level gauge having multipoint monitoring function

Abstract

Disclosed in the present invention is a high-precision laser sludge level gauge having a multipoint monitoring function. The sludge level gauge comprises a mounting bracket and a sludge level gauge gun camera, wherein the mounting bracket supports the sludge level gauge gun camera by means of horizontal rotation and tilt angle adjustment. The sludge level gauge gun camera comprises a housing, and a Doppler optical ranging unit and a gas-liquid drying and flushing unit that are arranged inside the housing, wherein the housing is fixedly arranged on the mounting bracket; the Doppler optical ranging unit inside the housing adjusts a laser focus by means of a lens, so as to identify a sludge-water interface inside a pipe; and an optical output end of the Doppler optical ranging unit is dried and flushed by the gas-liquid drying and flushing unit. The sludge level gauge measures the position of a sludge-water interface by adjusting a laser focal length, i.e., measuring the position of an interface between water having a flow velocity of N and a sludge surface having a flow velocity of 0 in a pipe, and finally calculates the thickness of a sludge layer in the pipe by means of the proportion of a focal length adjustment amount, thereby avoiding the problem of existing sludge level gauges being unable to measure the thickness of a sludge layer beneath a liquid surface in a flowing state.

Description

High-precision laser mud level gauge with multi-point monitoring function TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent water conservancy engineering, in particular to a high-precision laser mud level gauge with multi-point monitoring function. BACKGROUND

[0002] The drainage pipe network system, as an important infrastructure construction project in urban development, not only plays an important role in collecting and transporting rainwater, urban domestic sewage and industrial wastewater, but also shoulders important responsibilities such as urban water environment pollution prevention and control, drainage and flood control. Almost all problems in the drainage pipe system are closely related to the flow characteristics in the pipe, that is, the transportation process of water in the drainage pipe. For urban drainage pipes, due to historical factors, climate change and design cost reasons, it is impossible to design the pipe as a pipe system with large diameter and insignificant siltation effect, so siltation in urban drainage pipes is a fact in the near future and even a long period of time. There are two main reasons for pipe siltation: one is the deposition of solid particles washed into the drainage pipe by rainwater runoff; the other is the sedimentation of suspended solids in the sewage pipe. The existence of siltation reduces the capacity of the pipe and thus reduces the transportation capacity of the pipe, and may even cause pipe blockage. Pipe siltation brings many problems to pipe operation and maintenance, etc. Therefore, it is crucial to investigate and monitor the siltation condition of the drainage pipe.

[0003] The mud level gauge, i.e. the monitoring equipment for mud level monitoring, currently uses radar mud level gauges or ultrasonic mud level gauges in the industry, and is generally used in the clarifiers of sewage treatment plants. The installation point of the equipment has small environmental interference, and the principle is to first set the height of the radar or ultrasonic mud level gauge from the bottom of the pool, then detect the interface height of the sludge and water by radar or ultrasonic wave, and obtain the mud level height by algorithm operation. However, such equipment is not suitable for application in complex conditions such as urban drainage pipes or channels, and the flowing water in the drainage pipe will interfere with the radar or ultrasonic mud level gauge, making it difficult to obtain accurate mud level data. The traditional measurement principle and measurement equipment are difficult to apply to the mud level monitoring of municipal drainage pipes. The real-time monitoring technology of drainage pipe network mud level in China is almost in the blank stage, and there is still a lack of effective monitoring technology measures.

[0004] SUMMARY

[0005] The present application aims at overcoming the deficiencies of the prior art, and provides a high-precision laser mud level gauge with a multi-point monitoring function, which is based on a Doppler optical flow velocity analyzer, measures the position of a mud / water interface by adjusting a laser focal length, i.e. measures the position of the intersection surface of water with a flow velocity of N and mud with a flow velocity of 0, and finally calculates the thickness of mud in the pipeline by the amount of focal length adjustment and proportion, so as to avoid the problem that the existing mud level gauge cannot measure the thickness of mud under the liquid surface in a flowing state.

[0006] The high-precision laser mud level gauge with a multi-point monitoring function comprises a hanger and a mud level gauge gun, wherein the hanger is fixedly arranged inside a manhole, and the mud level gauge gun is horizontally twisted and supported on the hanger at an inclination angle.

[0007] The mud level gauge gun comprises a shell, and a Doppler optical distance measuring unit and a gas-liquid drying and flushing unit arranged inside the shell, wherein the shell is fixedly arranged on the hanger, the Doppler optical distance measuring unit inside the shell adjusts a laser focal point through a lens to identify a mud / water interface in the pipeline, and the light output end of the Doppler optical distance measuring unit is dried and flushed by the gas-liquid drying and flushing unit.

[0008] Preferably, the Doppler optical distance measuring unit comprises a light barrel, and a laser emission and receiving device, a fixed convex lens, a movable convex lens and a mud level gauge external lens are sequentially arranged from a light input end to a light output end inside the light barrel, and the inside of the light barrel is provided with a focusing motor, a focusing gear, a focusing rack bar, a fixed seat and a movable seat.

[0009] The focusing motor is fixedly arranged inside the light input end of the light barrel, the power output end of the focusing motor is connected to the focusing rack bar through the focusing gear, the focusing rack bar is axially slidably attached to the arc inner wall of the light barrel, the middle section of the focusing rack bar penetrates the fixed seat, and the end of the focusing rack bar is fixedly connected to the movable seat.

[0010] The fixed seat is fixedly connected to the fixed convex lens, and the movable seat is fixedly connected to the movable convex lens.

[0011] Preferably, the gas-liquid drying and flushing unit comprises a water flushing system and an air drying system, and the medium output ends of the water flushing system and the air drying system respectively spray gas and liquid to the mud level gauge external lens through independent connecting pipes.

[0012] The medium input end of the water flushing system is provided with a pressurized water pump, the pressurized water pump is fixedly arranged inside the shell, and the pressurized water pump is communicated with a water filling hole penetrating the shell.

[0013] The air drying system absorbs heat of the electric equipment inside the shell of the mud level gauge and sprays hot air to the external lens of the mud level gauge to dry and remove fog, and the air drying system comprises an air pump fixedly arranged inside the shell of the mud level gauge gun, and the air inlet end of the air pump is communicated with a surrounding air suction pipe, and the air outlet end of the air pump is communicated with a connecting pipe; the air inlet end of the surrounding air suction pipe is arranged around the electric equipment inside the shell and sucks air with heat generated by the equipment.

[0014] Preferably, the connecting pipe is provided with a pressurizing assembly, the pressurizing assembly comprising an inner pipe, an outer pipe and a spring piston, wherein one end of the inner pipe is communicated with a pressurizing water pump or an air pump, and one end of the outer pipe is communicated with a spray head; the medium outlet end of the inner pipe extends axially into the inner pipe and is provided with a plurality of axially spaced pipe through holes, and the inner pipe is axially elastically supported and connected with a spring piston elastically blocking the pipe through holes.

[0015] Preferably, the hanger comprises a well wall hanger and a gun hanger, wherein one end of the well wall hanger is fixedly arranged on the inner wall of the inspection well, the other end of the well wall hanger is rotatably connected with the gun hanger in the horizontal plane, and the bottom of the gun hanger is vertically angle-adjustably mounted with the mud level gauge gun.

[0016] Preferably, the well wall hanger comprises a fixed plate, a support rod and a fixed disc, wherein the fixed plate is fixed on the well wall of the inspection well by expansion bolts, and a plurality of support rods are fixedly arranged on one side of the fixed plate along the inner diameter of the inspection well; the end of the support rod is fixedly connected with the fixed disc in a horizontal posture.

[0017] Preferably, the gun hanger comprises a connecting disc, a rotating disc, a lateral hanging rod and a flip hanging plate, wherein the connecting disc is bolted to the fixed disc of the well wall hanger, the middle part of the connecting disc penetrates axially and is connected with the rotating disc in a circumferential rotation manner; a plurality of lateral hanging rods are fixedly arranged on the bottom surface of the rotating disc in a symmetrical manner, and the bottom of the lateral hanging rod is rotatably connected with the flip hanging plate.

[0018] Preferably, the upper part of the lateral hanging rod is fixedly arranged with a horizontal turning motor, and the lower part of the lateral hanging rod is rotatably connected with an angle adjusting gear; a fixed gear is coaxially fixed on the bottom surface of the connecting disc, the middle part of the fixed gear is rotatably connected with the rotating disc in an axial limiting manner, and the toothed segment of the bottom of the fixed gear is meshingly connected with the power output end of the horizontal turning motor; the two sides of the flip hanging plate are provided with flip gimbals, and the flip gimbals are meshingly connected with the angle adjusting gear.

[0019] Preferably, the shell is further provided with a controller, a storage battery and an ultrasonic sensor; the controller is electrically connected with the ultrasonic sensor, the hanger, the Doppler optical distance measuring unit and the gas-liquid drying and flushing unit; the storage battery supplies power to the controller, the ultrasonic sensor, the hanger, the Doppler optical distance measuring unit and the gas-liquid drying and flushing unit.

[0020] The advantages and technical effects of the present application are:

[0021] (1) The high-precision laser silt level meter with multi-point monitoring function avoids the interference of flowing turbid water on the equipment, and has high monitoring precision;

[0022] (2) The high-precision laser silt level meter with multi-point monitoring function can automatically adjust the horizontal rotation angle and the vertical inclination angle, can monitor the silt level of multiple points at different heights in the drainage pipeline through the spiral laser focal point path, and provide more monitoring data for the pipeline maintenance department, thereby providing data support for silt removal and pipeline dredging work;

[0023] (3) The high-precision laser silt level meter with multi-point monitoring function has lens water and gas double cleaning function, and through the flushing of pressurized water and pressurized gas in sequence, the lens cleaning is guaranteed, even if it is applied to complex environmental conditions such as drainage pipeline, the laser transmission can still avoid the interference of sewage;

[0024] (4) The high-precision laser silt level meter with multi-point monitoring function can extract the heat generated during the operation of the controller and the battery, and use it for lens cleaning and heating defogging, which not only can reduce the temperature inside the silt level meter, but also can prevent the lens from producing water mist, realizes the secondary utilization of energy, low carbon and environmental protection;

[0025] (5) The high-precision laser silt level meter with multi-point monitoring function is also provided with an ultrasonic sensor, which can measure the water level in the pipeline, which is helpful for the drainage pipeline maintenance department to judge the actual water flow and liquid level in the pipeline combined with the silt level, and has various functions and strong practicability. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 is a working state schematic diagram of the silt level meter of the present application;

[0027] Fig. 2 is a schematic diagram of the three-dimensional structure of the silt level meter of the present application;

[0028] Fig. 3 is a schematic diagram of the connecting pipe structure of the silt level meter of the present application;

[0029] Fig. 4 is a schematic diagram of the ranging principle of the Doppler optical ranging unit in the silt level meter of the present application (optical path schematic diagram);

[0030] In the figure: 1-pipe; 2-laser focal point path; 3-pipe fluid; 4-pipe silt; 5-gun rack; 6-well wall rack; 7-silt level gauge gun; 8-fixing disc; 9-connecting disc; 10-fixing tooth; 11-horizontal steering motor; 12-rotating disc; 13-lateral hanging rod; 14-supporting rod; 15-fixing plate; 16-housing; 17-surrounding type air suction pipe; 18-air pump; 19-inversion pan-tilt; 20-inversion hanging plate; 21-battery; 22-elevation adjustment gear; 23-controller; 24-pressurized water pump; 25-focusing motor; 26-focusing rack bar; 27-ultrasonic sensor; 28-light barrel; 29-silt level gauge external lens; 30-moving seat; 31-moving convex lens; 32-fixing seat; 33-fixing convex lens; 34-laser emission and receiving device; 35-nozzle; 36-outer pipe; 37-pipe through hole; 38-spring piston; 39-inner pipe. DETAILED DESCRIPTION

[0031] In order to further understand the content, characteristics and effects of the present application, the following examples are given, and the details are described below with reference to the accompanying drawings. It should be noted that the examples are descriptive, not limiting, and the protection scope of the present application cannot be limited by this.

[0032] A high-precision laser silt level gauge with multi-point monitoring function, which comprises a hanging rack and a silt level gauge gun 7, wherein the hanging rack is fixedly arranged inside the inspection well, and the silt level gauge gun is horizontally twisted and supported by the hanging rack and an inclination adjustment;

[0033] The silt level gauge gun comprises a housing 16 and a Doppler optical distance measuring unit and a gas-liquid drying and flushing unit arranged inside the housing, wherein the housing is fixedly arranged on the hanging rack, the Doppler optical distance measuring unit inside the housing adjusts the laser focal point through a lens to identify the interface between the silt and water in the pipe 1, and the light output end of the Doppler optical distance measuring unit is dried and flushed by the gas-liquid drying and flushing unit.

[0034] Preferably, the Doppler optical distance measuring unit comprises a light barrel 28, wherein the inside of the light barrel is sequentially provided with a laser emission and receiving device 34, a fixing convex lens 33, a moving convex lens 31 and a silt level gauge external lens 29 from the light input end to the light output end, and the inside of the light barrel is provided with a focusing motor 25, a focusing gear, a focusing rack bar 26, a fixing seat 32 and a moving seat 30;

[0035] The focusing motor is fixedly arranged inside the light input end of the light barrel, the power output end of the focusing motor is connected to the focusing rack bar through the focusing gear, the focusing rack bar is axially slidably attached to the arc inner wall of the light barrel, the middle section of the focusing rack bar penetrates the fixing seat, and the end of the focusing rack bar is fixedly connected to the moving seat;

[0036] The fixing seat is fixedly connected to the fixing convex lens, and the moving seat is fixedly connected to the moving convex lens.

[0037] Preferably, the gas-liquid drying and flushing unit comprises a water flushing system and an air drying system; the medium output ends of the water flushing system and the air drying system are respectively connected to the external lens of the mud level gauge through independent connecting pipes;

[0038] The medium input end of the water flushing system is provided with a pressurized water pump 24, which is fixedly arranged in the housing, and a water inlet hole penetrating the housing is connected to the pressurized water pump;

[0039] The air drying system absorbs heat generated by the electrical equipment in the housing and sprays hot air to the external lens of the mud level gauge to dry and remove fog. The air drying system comprises an air pump 18 fixedly arranged in the housing of the mud level gauge, and the air inlet end of the air pump is connected to a ring-shaped air suction pipe 17, and the air outlet end of the air pump is connected to a connecting pipe. The air inlet end of the ring-shaped air suction pipe is arranged around the electrical equipment in the housing and sucks air containing heat generated by the equipment.

[0040] Preferably, the connecting pipe is provided with a pressurizing assembly, which comprises an inner pipe 39, an outer pipe 36 and a spring piston 28. One end of the inner pipe is connected to the pressurized water pump or the air pump, and one end of the outer pipe is connected to a spray head 35. The medium output end of the inner pipe extends axially into the outer pipe and is radially provided with a plurality of axially spaced pipe through holes 37. The inner pipe is axially elastically supported by a spring piston elastically blocking the pipe through holes.

[0041] Preferably, the hanger comprises a well wall hanger 6 and a gun hanger 5. One end of the well wall hanger is fixedly arranged on the inner wall of the inspection well, the other end of the well wall hanger is rotatably connected to the gun hanger in the horizontal plane, and the bottom of the gun hanger is adjustably mounted on the mud level gauge in the vertical direction.

[0042] Preferably, the well wall hanger comprises a fixed plate 15, a support rod 14 and a fixed disc 8. The fixed plate is fixed to the well wall of the inspection well by expansion bolts, and a plurality of support rods are fixedly arranged on one side of the fixed plate along the inner diameter of the inspection well. The fixed disc is fixedly connected to the end of the support rod in a horizontal position.

[0043] Preferably, the gun hanger comprises a connecting disc 9, a rotating disc 12, a lateral hanging rod 13 and a flip hanging plate 20. The connecting disc is bolted to the fixed disc of the well wall hanger, and the connecting disc penetrates the rotating disc axially and is connected to the rotating disc circumferentially. A plurality of lateral hanging rods are fixedly arranged on the bottom surface of the rotating disc symmetrically, and the bottom of the lateral hanging rod is rotatably connected to the flip hanging plate.

[0044] The upper part of the lateral hanging rod is fixed with a horizontal steering motor 11, and the lower part of the lateral hanging rod is rotationally connected with an elevation adjustment gear 22.

[0045] Preferably, the shell is internally provided with a controller 23, a battery 21 and an ultrasonic sensor 27; the controller is electrically connected with the ultrasonic sensor, the hanger, the Doppler optical ranging unit and the gas-liquid drying and flushing unit; the battery supplies power to the controller, the ultrasonic sensor, the hanger, the Doppler optical ranging unit and the gas-liquid drying and flushing unit.

[0046] In addition, preferably, the controller and the laser emission and receiving device in the Doppler optical ranging unit are both mature products in the prior art.

[0047] The controller is of SRC-880 type.

[0048] The laser emission and receiving device is a laser Doppler velocimeter (LDA) of MSE-V-ONE type, which can synchronously and non-contactly measure one-dimensional to three-dimensional flow velocity and particle concentration in real time, and can measure the flow velocity of a characteristic fluid flowing in the opposite direction at supersonic speed, almost static state or in a circular turbulent flow.

[0049] In addition, preferably, the flip gimbals on the two sides of the flip hanging plate are mature products in the prior art.

[0050] In addition, preferably, the ultrasonic sensor can be used for liquid level monitoring in a drainage pipeline, and the real sewage liquid level in the pipeline can be obtained by converting the liquid level monitoring data and the sludge level monitoring data.

[0051] In order to more clearly illustrate the specific embodiments of the present application, an embodiment is provided as follows:

[0052] The monitoring principle of the present sludge level meter is to utilize the Doppler effect of laser to monitor. When the laser beam is irradiated on a moving object, the laser scattered by the moving object produces Doppler frequency shift. The movement speed of the fluid is determined by monitoring the optical frequency difference. When the movement speed of the object is 0, i.e. the laser is irradiated on the sludge or the pipe wall which does not move, the Doppler frequency shift produced by the laser is 0. The laser emission and receiving device, the movable convex lens and the fixed convex lens and other components can focus the laser to a predetermined focal point in the drainage pipeline. The laser focal point path 2 is shown in Fig. 1. A part of the laser in the focal point of the light beam is backscattered from the substance in the drainage pipeline, returns along the same path as the emitted light, and is focused back into the laser emission and receiving device. The point position of the signal data acquisition can be controlled by the positioning of the laser beam focal point. The laser emission and receiving device is set to receive only the laser Doppler signal from the laser focal point area. Finally, the position of the laser focal point in the drainage pipeline is controlled by the controller, so that the sludge level monitoring of multiple point positions is realized, as shown in Fig. 1.

[0053] The implementation process of the present application is as follows:

[0054] The present application is implemented in the municipal drainage pipeline network to monitor the sludge level, liquid level and other information of the drainage pipeline network.

[0055] Firstly, the installation position of the present sludge level meter in the drainage pipeline network is selected. A point position to be monitored is cleaned out. The point position is a pipe section without sludge and sewage. After the pipe cleaning is completed, if the present sludge level meter is installed at the top of the drainage pipeline, the fixed bolt is inserted into the top of the drainage pipeline. Then, whether the rotating disc is installed horizontally is checked by the level. Subsequently, the cleaning water tank is filled with clean water through the water filling hole. The sludge level meter is adjusted to make the bubble in the level bubble central. The above is the setting of the initial position of the sludge level meter. The remote controller is controlled by the power communication cable. The point position to be monitored is set. The horizontal and vertical angles of the sludge level meter are adjusted by the rotating disc and the turning hanging plate. The focal point position is adjusted by the movable convex lens. The background position information of the clean pipeline is monitored first to distinguish the sludge without flow rate. After the pipe background data corresponding to all the monitoring point positions are recorded, the initial information recording of the pipeline is completed. The cleaning frequency of the external lens of the sludge level meter is controlled by the controller. The cleaning mode is first the cleaning water pressure jet cleaning, and then the pressure gas jet cleaning. The present sludge level meter can utilize the battery or the power supply communication cable to provide energy power.

[0056] If the present sludge level meter needs to be installed on the side wall of the inspection well, the well wall fixing plate is first fixed on the side wall of the inspection well by the expansion bolt. The subsequent implementation process is consistent with the previous section.

[0057] In addition, preferably, the mud level meter of the present application is particularly suitable for mud level monitoring in a complex environment of a pipeline, on the one hand, the inside of the drainage pipeline is usually humid, and mist is easily formed; on the other hand, sewage splashing in the pipeline causes light shielding or refraction on the external lens of the mud level meter, and reduces the monitoring accuracy. Therefore, the present application designs a gas-liquid drying and flushing unit, which, when working, first performs pulse high-pressure water flushing of the external lens of the mud level meter by a water flushing system, then absorbs heat dissipation of the electrical equipment inside the shell by an air drying system, and forms high-temperature and high-pressure hot air to dry the external lens of the mud level meter, so as to solve the problem of measurement inaccuracy caused by dirt on the external lens of the mud level meter.

[0058] The monitoring method of the present application is as follows:

[0059] Step one: calibration, first, a standard pipeline of the mud level meter is used (the standard pipeline has the same diameter as the actual pipeline to be measured, and is filled with water but has no accumulated mud), the focal point path extends along the axial direction of the inner wall of the pipeline, to scan the interface between the pipe wall and the water in the pipeline at different axial positions, and the interface is defined as the standard 0 accumulated mud surface. During the monitoring process, the laser focal point falls on the position of the intersection of the pipe wall and the fluid 3 in the pipeline, and the focal length adjustment amount of the movable convex lens is positioned according to the position, and the adjustment amount is used as the initial calibration value of the accumulated mud 4 of the 0-thickness pipeline;

[0060] Step two: single-point monitoring, the laser emission and receiving device emits laser, and the focused laser is emitted in sequence through the fixed convex lens, the movable convex lens and the external lens of the mud level meter, the light signal reflected back by the focal point of the focused laser is collected by the laser emission and receiving device, to determine the flow rate of the fluid at the focal point position. When the flow rate of the fluid is N (N≠0), it is determined that the laser focal point is located at the middle position of the fluid in the pipeline; and when the flow rate of the fluid is 0, it is determined that the laser focal point is located at the mud surface position of the accumulated mud in the pipeline. The focal length adjustment amount of the movable convex lens is positioned by determining the transient state of the pipeline flow rate changing from N to 0, and compared with the focal length calibration value, to calculate the thickness of the accumulated mud in the pipeline;

[0061] Step three: the laser focal point path 2 in FIG. 1 is used to control the horizontal torsion and vertical overturning of the mud level meter gun, and the focal length adjustment of the movable convex lens, to monitor the pipeline accumulated mud, pipeline damage, pipeline collapse and pipeline corrosion and other pipeline inner wall intrusion faults of the multiple-point pipeline inner wall of the whole pipeline by the axially distributed spiral laser focal point path.

[0062] Through the use of the mud level meter in the present application, the mud level, liquid level and other information in the municipal drainage pipeline are accurately and real-timely monitored, the mud level meter is easy to maintain, and the labor maintenance cost is greatly reduced. The data collected by the mud level meter is abundant and reliable, and provides a feasible way and method for the planning, construction and maintenance of the municipal drainage system.

[0063] Finally, the unmentioned parts of the present application all adopt mature products and mature technical means in the prior art.

[0064] It is to be understood that the above description is intended to be illustrative and not restrictive. Many other embodiments will be apparent to those of skill in the art upon reviewing the above description. The scope of the application should, therefore, be determined not with reference to the above description, but instead with reference to the appended claims, along with their full scope of equivalents.

Claims

1. A high-precision laser mud level meter with multi-point monitoring function, characterized by: The mud level meter includes a bracket and a mud level meter gun, wherein the bracket is fixed inside the inspection well, and the bracket is horizontally twisted and tilt-adjusted to support the mud level meter gun; The mud level meter gun includes a shell, and a Doppler optical ranging unit and a gas-liquid drying and flushing unit arranged inside the shell, wherein the shell is fixed on a hanging bracket, the Doppler optical ranging unit inside the shell adjusts the laser focus through a lens to identify the mud-water interface in the pipeline, and the light output end of the Doppler optical ranging unit is dried and flushed by the gas-liquid drying and flushing unit.

2. The high-precision laser mud level meter with multi-point monitoring function according to claim 1 is characterized in that: The Doppler optical ranging unit includes a light tube, inside which a laser transmitting and receiving device, a fixed convex lens, a movable convex lens and an external lens of a mud level meter are sequentially arranged from the light input end to the light output end, and a focusing motor, a focusing gear, a focusing rack rod, a fixed seat and a movable seat are arranged inside the light tube; The focusing motor is fixed inside the light input end of the light tube, and the power output end of the focusing motor is meshed with the focusing rack rod through the focusing gear; the focusing rack rod axially slides and fits on the arc-surface inner wall of the light tube, the middle section of the focusing rack rod slides through the fixed seat, and the end of the focusing rack rod is fixedly connected to the movable seat; The fixed seat is fixedly connected to a fixed convex lens; the movable seat is fixedly connected to a movable convex lens.

3. The high-precision laser mud level meter with multi-point monitoring function according to claim 2 is characterized in that: The gas-liquid drying and flushing unit includes a water flushing system and an air drying system; the medium output ends of the water flushing system and the air drying system spray gas and liquid to the external lens of the mud level meter through independent connecting pipes; The medium input end of the water flushing system is provided with a pressurized water pump, which is fixed inside the shell and is connected to a water filling hole penetrating the shell; The air drying system absorbs the heat dissipated by the electrical equipment inside the shell, and sprays hot air to the external lens of the mud level meter for drying and demisting. The air drying system includes an air pump, which is fixed inside the shell of the mud level meter gun, and the air inlet end of the air pump is connected to a surrounding exhaust pipe, and the exhaust end of the air pump is connected to a connecting pipe; the air inlet end of the surrounding exhaust pipe is arranged on the periphery of the electrical equipment inside the shell and extracts air with heat from the operation of the equipment.

4. The high-precision laser mud level meter with multi-point monitoring function according to claim 3 is characterized by: A pressurizing assembly is provided in the connecting pipe, which includes an inner tube, an outer tube and a spring piston, wherein one end of the inner tube is connected to a pressurized water pump or an air pump, and one end of the outer tube is connected to a nozzle; the medium output end of the inner tube extends axially to the inside of the outer tube and is radially provided with a plurality of axially spaced pipe through holes, and the internal axial elastic support of the inner tube is connected to a spring piston that elastically blocks the plurality of pipe through holes.

5. The high-precision laser mud level meter with multi-point monitoring function according to claim 1 is characterized in that: The bracket includes a well wall bracket and a gun rack, wherein one end of the well wall bracket is fixed on the inner wall of the inspection well, and the other end of the well wall bracket is rotated on the horizontal plane to mount the gun rack, and the bottom of the gun rack is adjusted in the vertical direction to mount the mud level meter gun.

6. The high-precision laser mud level meter with multi-point monitoring function according to claim 5, characterized in that: The well wall frame includes a fixing plate, a support rod and a fixing plate, wherein the fixing plate is fixed to the well wall of the inspection well by expansion bolts, and multiple support rods are fixed on one side of the fixing plate along the radial direction of the inspection well; the end of the support rod is fixed to the fixing plate in a horizontal posture.

7. The high-precision laser mud level meter with multi-point monitoring function according to claim 5, characterized in that: The gun frame includes a connecting plate, a turntable, a lateral hanging rod and a flip hanging plate, wherein the connecting plate is bolted to the fixed plate of the well wall frame, and the middle part of the connecting plate axially penetrates and circumferentially rotates to connect to the turntable; a plurality of lateral hanging rods are symmetrically fixed on the bottom surface of the turntable, and the bottom of the lateral hanging rod is rotatably hung to the flip hanging plate.

8. The high-precision laser mud level meter with multi-point monitoring function according to claim 7, characterized in that: A horizontal steering motor is fixedly provided on the upper part of the lateral hanging rod, and an elevation adjustment gear is rotatably connected to the lower part of the lateral hanging rod; a fixed tooth is coaxially fixed on the bottom surface of the connecting disk, the optical axis section in the middle of the fixed tooth rotates circumferentially and axially limits the hanging turntable, and the tooth section at the bottom of the fixed tooth is meshed with the power output end of the horizontal steering motor; a flip platform is provided on both sides of the flip hanging plate, and the flip platform is meshed with the elevation adjustment gear.

9. The high-precision laser mud level meter with multi-point monitoring function according to claim 1, characterized in that: A controller, a battery and an ultrasonic sensor are also provided inside the shell; the controller is electrically connected to the ultrasonic sensor, the bracket, the Doppler optical ranging unit and the gas-liquid drying and flushing unit; the battery supplies power to the controller, the ultrasonic sensor, the bracket, the Doppler optical ranging unit and the gas-liquid drying and flushing unit.

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