2729results about "Level indicators by floats" patented technology

The invention relates to the technical field of water level surveying devices, and discloses a hydrogeological multi-layer underground water level surveying device and a surveying method.The hydrogeological multi-layer underground water level surveying device comprises a support and a water sampling barrel, the support is provided with a winding mechanism, and the winding mechanism is used for adjusting the sampling height of the water sampling barrel; the upper part of one side of the water sample sampling barrel is communicated with a liquid inlet pipe, and the bottom of the water sample sampling barrel is fixedly connected with a balancing weight. In the sampling process, large-particle impurities in water are blocked through the filter screen, the impact force of water flow can be converted into the rotating force of the blades, the rotating shaft and the scraping rod, the function of automatically cleaning the impurities in the sampling process is achieved, and the rope winding condition caused by uncontrollable winding position is prevented through the adjusting mechanism; the dustproof mechanism prevents dust and stones from falling into the hydrological hole to affect sampling of a water sample in the surveying process, and the highest water level in the hydrological hole can be accurately known through the water level monitoring mechanism.

A soap dispenser having a soap level indication system includes a soap container with a main volume surrounded by one or more sidewalls, a channel disposed along at least one sidewall of the one or more sidewalls and being fluidically coupled to the main volume of the soap container via a passage, a float structure disposed within the channel and configured to float in a liquid within the soap container, and a level indicator disposed along an exterior surface of at least one sidewall of the one or more sidewalls. The level indicator is located adjacent the float structure. Further, the level indicator and the float structure are magnetically coupled to each other so that the level indicator indicates the location of the float structure within the channel.

The invention discloses a magnetostriction liquid level meter temperature compensation method and system based on a support vector machine. The method comprises the steps that the currently captured original pulse number is obtained through a magnetostriction liquid level meter; the current environment temperature is detected in real time through a high-precision temperature sensor in the magnetostrictive liquid level meter; taking the original pulse number and the current environment temperature as input features, sending the input features to a pre-trained support vector machine regression model (SVM), and outputting a displacement error prediction value in the current temperature environment; and correcting the original measurement result according to the error prediction value to obtain a real pulse measurement value after temperature compensation. The system comprises a time-to-digital conversion chip, a temperature chip temperature measurement module, a support vector machine reasoning module, a pulse compensation module and a distance calculation module. According to the method, nonlinear modeling can be carried out on measurement errors caused by environment temperature changes, so that the liquid level measurement result is dynamically corrected, and the overall robustness and precision of a measurement system are improved.

The invention relates to the technical field of water level monitoring of water conservancy, and discloses water level monitoring equipment for surveying and mapping of water conservancy, which comprises a vertical rod, a control box, a solar panel, a camera and a mounting frame are detachably mounted on the vertical rod, and an equipment box is arranged at the top of the mounting frame. During use, the water level can be monitored in real time through cooperation of the water level sensor and the floater, after long-time use, the lifting frame is driven by the lifting mechanism to move downwards, and the inner wall of the measuring cylinder is cleaned through the inner wall cleaning mechanism in the downward movement process of the lifting frame; and when the lifting frame descends to a set position, the balance hole can be dredged through the hole cleaning mechanism, and when the lifting frame moves downwards to the bottom end of the measuring cylinder, the foreign matter is discharged through the action of water flow, so that the foreign matter is prevented from being left in the measuring cylinder.

The utility model provides a pile foundation concrete pouring over-pouring height measuring device which comprises an installation frame, a winding drum mechanism arranged on the installation frame, a coil spring arranged in the winding drum mechanism, a measuring rope with one end fixed and wound on the winding drum mechanism and a fixing piece connected with a reinforcement cage. The fixed part is arranged on the mounting frame, the floating ball mechanism is movably connected to the fixed part and connected with the other end of the measuring rope, the ratchet wheel is fixedly connected to the winding drum mechanism, and the alarm mechanism is arranged on the mounting frame and used for being matched with the ratchet wheel. The pile hole concrete surface ascends to push the floating ball mechanism to ascend, and then under the action of the coil spring, the winding drum measuring rope is driven to be shortened, the winding drum mechanism and the ratchet wheel are driven to rotate, so that the alarm mechanism matched with the ratchet wheel sends out a signal to remind constructors of the concrete pouring condition, and accurate control over the over-pouring height is achieved. Tediousness and uncertainty of manual judgment are avoided, and construction efficiency and construction quality of the pile foundation are effectively improved.

The flood prevention alarm device for the water conservancy project comprises a cylinder, bottom columns and an insertion cone, the bottom columns are fixedly connected to the bottom of the cylinder, the bottom columns are annularly arranged, the insertion cone is fixedly connected to the lower ends of the bottom columns, and the flood prevention alarm device for the water conservancy project further comprises a floating assembly and an alarm assembly. The utility model belongs to the technical field of water conservancy projects, and particularly relates to a water conservancy project flood prevention alarm device which solves the problems that when the water level reaches a warning water level, a warning prompt cannot be automatically sent out, so that quick response and timely prevention and control cannot be achieved, and certain potential safety hazards exist.

The invention provides a hydraulic engineering water level monitoring method and system based on artificial intelligence. Meteorological parameters and soil humidity parameters of a cross-basin reservoir group and water level measurement parameters generated by magnetic levitation displacement induction are obtained, dynamic change rules of the parameters are analyzed, and a correlation strength coefficient reflecting the hydraulic interaction between reservoirs is calculated. And the coefficient and a water level measurement parameter are jointly coded, and a cross-reservoir dynamic association map is constructed. And synchronously acquiring real-time water level signals of each reservoir, matching the real-time water level signals with a preset fluctuation feature library, and identifying a water level abnormal interval related to the water flow path node. And in combination with a mapping relationship between the dynamic association map and the abnormal fluctuation interval, determining a water level imbalance risk level, and generating regulation and control instructions including flood discharge path optimization and water storage capacity adjustment according to the water level imbalance risk level. According to the technical scheme, the water level monitoring efficiency and accuracy of the water conservancy project can be improved.

The invention discloses a foundation pit underground water monitoring device under complex conditions and a construction method, and relates to the technical field of underground water monitoring. The first telescopic rod is connected with the controller through a data transmission module and is used for receiving a control signal of the controller; one end of the supporting rod is fixedly connected with the telescopic end of the first telescopic rod, and the other end of the supporting rod is a free end; the distance sensor is electrically connected with the free end of the supporting rod, and the distance sensor is connected with the controller through a data transmission module; the monitoring assembly is arranged at the lower end of the first telescopic rod and used for monitoring the water level of underground water; the method has the effect of improving the foundation pit water level monitoring efficiency.

The invention relates to the technical field of liquid ammonia liquid level meters, in particular to a liquid ammonia liquid level meter capable of automatically cleaning impurities and a method thereof.The liquid ammonia liquid level meter comprises a sampling pipe and a floating ball liquid level sensor installed in the sampling pipe, the floating ball liquid level sensor is used for detecting the position of a floating ball and the height of the liquid level, and the floating ball liquid level sensor transmits detection data to a processor; a heat tracing pipe is arranged on the outer wall of the sampling pipe, a flow meter for introducing inert gas is arranged at the upper end of the sampling pipe, and a blow-down valve is arranged at the lower end of the sampling pipe. Whether the floating ball is stuck or not is judged by automatically detecting the position of the floating ball, then cleaning is achieved by heating and nitrogen introduction for purging under the condition that the floating ball is stuck, and due to the integrated automation technology, the accuracy of liquid level measurement of liquid ammonia and the stability of the system are remarkably improved. According to the device, impurities attached to the liquid level meter can be removed in time, the floating ball is prevented from being jammed, and accuracy and reliability of liquid level measurement data are ensured.

The utility model discloses an underground water level monitor for geotechnical engineering, which relates to the technical field of water level monitoring and comprises a probe rod body and a protective sleeve sleeved outside the probe rod body, and the top end of the probe rod body is provided with a traction rope penetrating out of an annular seat at the top of the protective sleeve; an overturning frame is rotationally installed on the side face of the bottom of the protective sleeve, a floating plate and a plugging frame are arranged at the two ends of the overturning frame respectively, and the plugging frame is arranged at the end, close to the protective sleeve, of the overturning frame; a floating plate is arranged at the upper part of the floating plate; by means of the torque change design of the floating plate, the overturning frame and the plugging frame, when the floating plate does not enter water, the plugging plate covers the open groove in the lower end of the protective sleeve, and rock soil and other sundries can be prevented from entering the protective sleeve to affect the probe rod; when the floating plate enters water, the blocking plate is moved away, so that the probe rod can be in contact with the water body in time to monitor the water level.

The invention relates to the technical field of storage tank liquid level meters, in particular to a liquid storage tank liquid level meter which comprises a magnetic turning plate liquid level meter used in cooperation with a tank body, the bottom of the tank body is fixedly connected with a water outlet, the top of the tank body is fixedly connected with a water inlet, the outer side of the tank body is further fixedly connected with two sets of butt-joint pipe openings, and the magnetic turning plate liquid level meter is fixedly connected to the butt-joint pipe openings. The arc-shaped baffle is fixedly connected to the bottom of the tank body, the two communicating pipes are fixedly connected to the magnetic turning plate liquid level meter, the filtering assemblies are rotationally connected to the communicating pipes, the two driving assemblies are fixedly connected to the upper end and the lower end of the tank body, the dredging assemblies are fixedly connected to the driving assemblies, and the removing assemblies are fixedly connected to the dredging assemblies. By arranging the dredging assembly and the driving assembly, power generated when liquid enters or is discharged out of the tank body can be used for sweeping the filter cartridge, and swept solid particles are pushed to the middle position of the tank body, so that the solid particles are prevented from being accumulated at the filter cartridge, and the metering accuracy is prevented from being influenced.

The invention relates to a liquid hydrogen storage tank liquid level meter based on an ultrasonic ranging technology, which comprises a floater, a floater limiting net cylinder, an ultrasonic ranging probe, an aviation plug, a cable and a computer, and ensures the effectiveness and reliability of the liquid level meter under the design condition of a liquid hydrogen tank. The buoy liquid level meter and the ultrasonic ranging technology are combined, and compared with a traditional capacitive liquid level meter, the liquid level meter has the advantages of being small in size, convenient to install and low in cost.

A weighing system for medical applications may include a basin that has a base and a sloped sidewall that collectively form a bounded cavity with open top surface that receives and holds the material to be weighed. The basin may be free floating above the weighing device within a restricted range of travel. In some examples, the weighing system includes a thermal treatment device to adjust the temperature of the material in the basin. The rate at which heat is delivered to the basin may vary depending on the weight of the contents in the basin.

The invention relates to the technical field of glass production detection devices, and discloses a processing device capable of accurately controlling glass thickness, the processing device comprises a conveying belt and a thickness detector, the conveying belt conveys a glass plate to a position below the thickness detector, a jumping part is arranged at the bottom of the thickness detector, and the jumping part can move according to different thicknesses of the glass plate. When the glass plate moves upwards, different displacement amounts are generated, the thicker the glass plate is, the larger the displacement amount of the jumping piece is, the jumping piece moves upwards, an elastic bag is arranged above the jumping piece, a liquid level pipe is arranged above the elastic bag, the elastic bag is filled with liquid, and when the jumping piece moves upwards, the elastic bag can be extruded, so that the liquid in the elastic bag flows to the liquid level pipe; the conveying belt is composed of a rolling roller and a rolling roller air bag, the rolling roller air bag wraps the outer side of the rolling roller and is driven by the rolling roller to rotate to drive the glass plate to move, an inflation device is arranged in the rolling roller air bag, and the amount of gas in the rolling roller air bag is kept unchanged.

The invention discloses a watercourse basin hydrological surveying and mapping device, and particularly relates to the technical field of surveying and mapping, the watercourse basin hydrological surveying and mapping device comprises a stand column arranged on the bank side of a watercourse basin, a photovoltaic panel erected on the top of the stand column, an extension arm, a detection area arranged on the stand column and extending to a watercourse, and a water level monitoring unit. The water quality monitoring unit can complete dynamic adjustment along with the water level of the river channel, surveying and mapping precision is improved, meanwhile, a recording mechanism is additionally arranged, the recording mechanism completes follow-up cooperation along with the water quality monitoring unit, the change of the water level of the river channel can be sensed, and real-time recording is completed through a receiving unit. Dynamic continuous drawing operation can be completed under the power-off condition, the problem that the river water level change is missing under the condition that electronic equipment such as a water level monitoring unit breaks down is solved, drawing data are enriched, the accuracy of river hydrological drawing is improved, the error rate is reduced, and guarantee is provided for river water level surveying and mapping work.

The utility model discloses a mine accumulated water depth measuring device, which belongs to the technical field of mine accumulated water measurement and comprises a floating plate, supporting plates are symmetrically and fixedly connected to the side surface of the floating plate, a winding roller is arranged on the inner side of each supporting plate, a rope is fixedly connected to the side surface of each winding roller, and a through hole is formed in the center of the floating plate. One end of the rope penetrates through the through hole to be fixedly connected with a balancing weight, the upper surface of the floating plate is rotationally connected with a gear ring, the inner side surface of the gear ring is fixedly connected with an electric telescopic rod through a side plate, and one end of the electric telescopic rod is fixedly connected with a marking pen. The situation that mine accumulated water is measured manually through a lifting rope and a balancing weight is avoided, the situation that the measurement accuracy of the mine accumulated water depth is reduced due to rough measurement is prevented, the measurement device can enter a mine for measurement, the limitation of mine accumulated water measurement is reduced, large-area multi-point measurement can be achieved, and the measurement efficiency is improved. People can further know the depth of the accumulated water in the mine, and the practicability of the measuring device is improved.

The utility model discloses sewage liquid level detection equipment in a sewage pipeline well, which relates to the technical field of liquid level detection equipment, and comprises a net cylinder and a floating body mechanism, the inner bottom wall of the net cylinder is fixedly connected with a connecting rod, the top of the connecting rod is fixedly connected with a cylinder cover, the floating body mechanism penetrates through the cylinder cover, and a force storage rebound mechanism and a cleaning mechanism are arranged in the net cylinder. The cleaning mechanism comprises a mounting plate, and a plurality of knocking rods and water stirring plates are fixedly connected to the side, close to the inner wall of the net barrel, of the mounting plate. The device has the beneficial effects that a power mechanism drives a rotating mechanism, the rotating mechanism drives a sleeve to do circular motion, a movable rod continuously extrudes a pressure bearing assembly, the movable rod is rapidly released after force is stored, the movable rod drives a mounting plate to rapidly move towards the inner wall of a net cylinder, a knocking rod knocks the net cylinder, and the net cylinder vibrates; and the water stirring plate stirs sewage in the mesh cylinder, so that the sewage rushes out of the mesh cylinder, and impurities such as plastic films attached to the mesh cylinder are impacted, so that the impurities can be effectively scraped off by the scraper.

The invention relates to the technical field of prefabricated pump stations, in particular to a liquid level detection control device for a multifunctional prefabricated pump station, which comprises a transmission line, a balancing weight and a shell, and further comprises an air bag, a baffle plate, a first connecting pipe and a second connecting pipe, the transmission line is communicated with an external control system, and the balancing weight is sleeved on the surface of the transmission line; the bottom of the transmission line is sleeved with the shell, the baffle is arranged around the transmission line, a vertical groove is formed in the side, close to the transmission line, of the baffle, the air bag is fixedly installed at the bottom of the baffle, the first connecting pipe is arranged on the surface of the air bag and penetrates through the balancing weight to communicate the air bag with the interior of the shell, and the second connecting pipe is arranged on the surface of the shell. The surface of the baffle is provided with an air port, the air port communicates with the interior of the shell through a second connecting pipe, the air bag deforms through rising or falling of the water level in the prefabricated pump station to conduct air suction and exhaust, air in the air bag can circulate in the shell, and when the shell floats upwards or descends, the surface of the shell deforms.

The invention relates to an observation platform and method for offshore positioning and real-time water level transmission, and the platform comprises a floating disc, a power generation device which is disposed at the outer side or the inner part of the floating disc, an antenna, a transmission terminal, a moisture reporting instrument, and a water level gauge, the power generation device comprises a solar panel and a wind driven generator, and the upper side of the floating disc is rotatably connected with a rotating seat assembly. The solar panel and the wind driven generator are installed above the rotating base assembly, and the antenna is fixedly installed in the center of the top of the floating disc. The motor is connected with the driving gear to rotate to drive the rotating ring and the rotating seat body to rotate, so that the orientations of the solar panel and the wind driven generator are driven to change to adapt to the change of the wind direction and the sun irradiation angle, and the purpose of guaranteeing the power generation efficiency is achieved; meanwhile, the height of the antenna is designed through a beyond-visual-range propagation distance expression formula, so that the propagation distance of data transmission is guaranteed, and the method has high application and popularization value.

A no emission tank gauge has a housing having a valve connection extending from a bottom side of the housing, a gauge line within the housing, the gauge line having a plumb bob attached at a free end, a pulley attached within the housing and supporting the gauge line, the pulley configured to allow extension and retraction of the gauge line, and an actuator connected to the pulley and extending exterior to the housing and configured to actuate the extension and retraction of the gauge line via rotation of the pulley. The housing has a window in a wall of the housing facing a marked side of the gauge line. The valve connection has an opening sized to allow for passage of the plumb bob and the gauge line. The housing is sealed when the valve connection is connected to a valve to prevent escape of fluid.

The invention relates to a soil leachate collecting device, and relates to the technical field of soil detection sampling equipment, the soil leachate collecting device comprises a collecting box, a liquid collecting hopper and a water guide pipe, the collecting box is internally provided with a plurality of sampling bottles, the water guide pipe guides leachate into the sampling bottles, and the collecting box is provided with a liquid level assembly, a moving mechanism and a moving-out mechanism. The leakage liquid enters the sampling bottle, the liquid level assembly displays the liquid level in the sampling bottle, after sampling is completed, the moving mechanism takes out the sampling bottle located at the sampling position, and the moving mechanism drives the next sampling bottle to move to the sampling position, so that multiple sampling through one-time burying is achieved, and a soil layer cannot be damaged during repeated sampling; large-size equipment such as a water pump does not need to be carried, and the sampling bottle can be directly taken back to a laboratory for detection after being taken out, so that the convenience of collecting the soil leachate and the sampling accuracy are improved, the probability that impurities are mixed into the leachate is reduced, secondary pollution is avoided, and the accuracy of later detection data can be guaranteed to the greatest extent.

The invention relates to the technical field of permeability detection, and discloses highway engineering asphalt pavement detection equipment which comprises a base, a mounting seat is mounted on the base through a support, a measuring cylinder and a mounting frame are mounted on the mounting seat, two balancing weights are mounted on the base, a recording device is arranged on the base, and the recording device is connected with the measuring cylinder. The recording device comprises a motor, the output end of the motor is connected with a cam, a sliding groove frame is installed on the top face of the installation base in a sliding mode, a rack is connected to the sliding groove frame, and the recording device further comprises a paper storage assembly. Through the cooperation of the recording device and the paper storage assembly, the recording pen can automatically record the real-time water level height on the recording paper in a timing mode, no staff is needed for guarding, the time of the staff is not delayed, timing recording is conducted at the fixed recording frequency, the recording time is accurate, and the accuracy of test data is high.

The water level monitoring device comprises a base, an adjusting mechanism is arranged at the top of the base, an auxiliary assembly is arranged on the surface of the adjusting mechanism, a water level monitoring assembly is connected to the end, away from the adjusting mechanism, of the auxiliary assembly, and a protection mechanism is arranged outside the water level monitoring assembly; the protection mechanism comprises a limiting ring frame, the limiting ring frame is arranged on the outer side of the water level monitoring assembly, and the bottom of the limiting ring frame is fixedly connected with a hollowed-out protection cylinder. According to the water level monitoring device for the intelligent water conservancy, the hollowed-out protection cylinder is arranged outside the water level monitoring assembly, so that water flow fluctuation is effectively weakened, damage to the water level monitoring assembly caused by direct striking of torrential water flow to the water level monitoring assembly is avoided, and meanwhile the influence of water flow fluctuation on water level monitoring data is reduced; a clamping frame is matched with a limiting bolt, so that a limiting ring frame and a hollow protection barrel can be adjusted and mounted to different heights outside the water level monitoring assembly, the height of a floating ball is conveniently adapted, and the practicability is improved.

The invention provides a self-correcting magnetostrictive liquid level gauge and a use method, belonging to the technical field of liquid level gauges. The self-correcting magnetostrictive liquid level gauge comprises a fixed plate, a probe rod and a meter head. The outer surface of the probe rod is provided with a suspension component, and the suspension component is arranged inside a filter component. The filter component is slidably connected to the outer surface of the probe rod. A moving component is fixedly installed on the lower surface of the fixed plate, and a connecting component is installed on the moving component. With the arrangement of the suspension component, a worker can add water to the inside of a suspension ball according to the density of the solution to change the weight of the suspension. Since the density of each liquid surface is different, the weight of the suspension balls at different positions can be made different by adjusting the weight of the suspension balls, so that a plurality of suspension balls can float on different solutions, thereby achieving the purpose of measuring multi-layer liquid surfaces.

A tank monitor control system, device and methods are disclosed that are suitable for remote monitoring. The device comprises a monitoring unit for insertion into a fluid holding device or tank to monitor a level of fluid stored in the fluid holding device. The monitoring unit comprises at least one sensor and a communication device for transmitting the data. Additional functionalities include location data, temperature data, water quality properties, and a pressure device for measuring pressure and calculating the weight of the fluid. The system provides automatic data generation and user defined alerts along with the ability to use artificial intelligence.

The invention belongs to the technical field of transformer safety monitoring, and particularly relates to a transformer oil level and temperature abnormity collaborative diagnosis device, which comprises a tubular main body, an oil level buoy mechanism, a signal acquisition mechanism and a main control mechanism, the oil level buoy mechanism comprises a floater and a sliding rod; the free end of the sliding rod is inserted into the tubular main body through the bottom of the tubular main body; a magnet is fixedly arranged at the free end of the sliding rod; the signal acquisition mechanism is fixed in the tubular main body; the signal acquisition mechanism comprises a plurality of magnetic sensors arranged along the axis direction of the tubular main body; the main control mechanism is used for performing oil level analysis according to data acquired by the plurality of magnetic sensors; the floater is further provided with an oil temperature sensor used for collecting the oil temperature and sending the oil temperature to the main control mechanism. The main control mechanism is further used for conducting comprehensive risk state analysis according to the current oil level and the current oil temperature and conducting corresponding processing according to the analysis result. According to the invention, the oil level of the transformer can be efficiently and accurately monitored in real time, and continuous, accurate and automatic monitoring of the oil level is realized.

A charging and refuelling station for an autonomous cleaning robot including; a charging mechanism including a sprung mount resiliently supported on the charging and refuelling station, a swivel mount pivotally supported on the sprung mount, the swivel mount supporting contact plates for contacting charging contact plates of the autonomous cleaning robot when docked at the station; and a water exchange system including a tap for fresh water refilling of the autonomous cleaning robot, and a draining system including a drain tank for receiving water draining from the autonomous cleaning robot.

The invention relates to the field of liquid level detection devices, in particular to a liquid level detector which is structurally characterized in that a floater comprises a movable plate, side plates are arranged on the two sides of the movable plate, the side plates extend inwards to be provided with first sliding rods and second sliding rods, and the side plates are matched with side edge sliding grooves of positioning rods through the first sliding rods and the second sliding rods; according to the device, the probe emits laser and receives and processes electric signals generated by a reflected light source, the first sliding rod and the second sliding rod of the floating device are embedded into the side sliding groove, the diameter of the first sliding rod is smaller than that of the second sliding rod, the first sliding rod and the second sliding rod are prevented from being clamped in the side sliding groove, the first sliding rod and the second sliding rod are of a cylindrical structure, and the detection accuracy is improved. The vertical displacement smoothness can be improved, the plate body is rotationally connected with the movable shaft, precision reduction caused by too large shaking of the plate body due to too large gaps can be avoided, meanwhile, the protruding detection table is arranged at the top of the plate body and used for the emission surface of a laser point, and drainage holes are formed in the periphery of the detection table.

The utility model discloses a magnetic turning plate liquid level meter, and relates to the technical field of liquid level meters. The liquid level meter comprises a liquid level meter body and a filtering assembly, an upper connecting pipe is welded to the top of the peripheral face of the liquid level meter body in a penetrating mode, a water inlet pipe is welded to the top of the peripheral face of the upper connecting pipe in a penetrating mode, and the filtering assembly is clamped to the bottom of the peripheral face of the liquid level meter body in a penetrating mode; a blow-off pipe is welded to the bottom of the peripheral surface of the filter assembly in a penetrating manner, a breather pipe is welded to the peripheral surface of the blow-off pipe in a penetrating manner, an air blower is fixedly clamped to the other end of the breather pipe, and a filter element is clamped to one end in the filter assembly in a penetrating manner. Through the arrangement of the liquid level meter main body and the filtering assembly, the problems that cleaning liquid after flushing and cleaning in a magnetic turning plate liquid level meter is easy to remain in the liquid level meter, impurities are introduced into measured liquid, and the filtering capacity of a filter element declines too fast when the liquid entering the liquid level meter is filtered, so that the liquid level meter is not easy to clean are solved. And the measured liquid cannot enter the liquid level meter in time, so that the measurement is not accurate.

When the water level detection device is used, the base is fixed on a riverbed, the density of the graduated scale is smaller than that of a water body, so that the graduated scale can be automatically in a vertical state in the calm water body, the graduated scale can be scratched through the first through hole in the downward moving process of the floating body, and the graduated scale can be scratched through the second through hole in the upward moving process of the floating body. When the water level needs to be determined, the graduated scale can be scratched through the second through hole, so that numerical values on the graduated scale are clearer and not easy to misread, the measuring result can be more accurate by matching with the floating body which is not easy to be influenced by water surface fluctuation, and the scale value of the graduated scale corresponding to the floating body can be observed through the camera device when the water level needs to be determined; as the graduated scale is composed of a plurality of detachable rod pieces, the number of the rod pieces can be adjusted, so that the length and the measuring range of the graduated scale are adjusted, and the graduated scale is convenient to carry after being detached; in general, the water level detection device is larger in measurement range and more accurate in measurement result, and the graduated scale is convenient to carry and can be automatically in a vertical state in a calm water body.