31results about How to "Improve metering accuracy" patented technology

The invention belongs to the technical field of electric power measurement, and discloses a calibration method and system of an intelligent measurement switch and a multi-switch synchronous measurement method, and the method comprises the steps: obtaining voltage and current waveform data of the intelligent measurement switch under a nonlinear load condition, and extracting a frequency spectrum feature matrix of the voltage and current waveform data; constructing an amplitude-phase coupling error model representing a nonlinear incidence relation between amplitude fluctuation and phase deviation, inputting the spectrum characteristic matrix into the amplitude-phase coupling error model, and calculating an amplitude-phase coupling error vector; performing vector decomposition on the amplitude-phase coupling error vector, and separating out an in-phase component error and an orthogonal component error; and generating a calibration compensation coefficient according to the in-phase component error and the orthogonal component error, and performing vector calibration on the intelligent measurement switch, thereby improving the calibration precision of the intelligent measurement switch.

The utility model relates to a valve type orifice plate throttling metering device, and belongs to the technical field of pipeline fluid flow detection. Comprising a throttling unit and a differential pressure flowmeter, the throttling unit comprises a valve body and a pore plate assembly, the valve body is provided with a fluid channel and a pore plate channel, the fluid channel is communicated with a fluid conveying pipeline, the pore plate channel is vertically communicated with the fluid channel, and the pore plate assembly is slidably installed in the pore plate channel in the horizontal direction; pressure tapping holes communicated with the fluid channel are formed in the top of the valve body and located in the two sides of the pore plate channel. And two inlets of the differential pressure flowmeter are communicated with the pressure tapping holes one by one through vertical pressure guide pipes. According to the valve type orifice plate throttling metering device, the sliding direction of the orifice plate assembly is horizontally arranged, the pressure tapping hole is formed in the top of the valve body, and the pressure guide pipe is vertically connected with the pressure tapping hole, so that liquid accumulation in the pressure guide pipe can be avoided, and the metering accuracy of the device is effectively improved.

The invention provides an electric energy meter wiring terminal and an electric energy meter, and relates to the technical field of electric variable measuring instruments. According to the electric energy meter wiring terminal, the electric energy meter wiring terminal is assembled in the shell, the meter tail wire pressing hole is right opposite to the port, when an external wire is connected with the electric energy meter, the external wire is inserted into the port through the meter tail wire pressing hole, the wire cannot be cut when the external wire is locked, and the connection stability of the external wire and the electric energy meter is improved.

The utility model relates to a liquid flow metering device, subassembly and system.The liquid flow metering device comprises a measuring chamber, a floater subassembly, a sleeve and an electrical subassembly, a measuring chamber body is hermetically connected with a liquid inlet pipeline and a liquid outlet pipeline, the liquid inlet pipeline extends into the measuring chamber body, and the liquid outlet pipeline extends into the measuring chamber body; a liquid outlet at the tail end faces upwards; the floater assembly comprises a floater and a floater connecting rod integrally connected with the floater, the floater is arranged at a liquid outlet in the tail end of the liquid inlet pipeline, and the tail end of the floater connecting rod is connected with the detection part; the lower end of the sleeve is communicated with the measuring cavity body, the tail end of the floater connecting rod extends into a guide channel in the sleeve from the lower end of the sleeve, and a position detection device is arranged in the upper end of the sleeve; the electrical assembly comprises a shell and an electrical module, and the electrical module receives a floater height detection signal sensed by the position detection device. The metering device provided by the embodiment of the utility model is low in cost and accurate in metering.

The invention discloses a critical dimension scanning electron microscope image processing method and electronic equipment, and the method comprises the steps: employing a pre-trained image processing model to carry out the processing of an input image, and obtaining an optimized image; the pre-trained image processing model comprises a de-noising branch and an edge enhancement branch, the two branches are both formed based on a U-Net network architecture, the de-noising branch comprises a first encoder module and a first decoder module which are connected in sequence, and the first encoder module and the first decoder module both adopt an SC block module to extract local and global features of an image; the edge enhancement branch comprises an edge information extraction module, and a second encoder module and a second decoder module which are connected in sequence; and the feature fusion module is used for fusing all levels of output of the first encoder module and all levels of output of the second encoder module to serve as all levels of input of the first encoder module. Compared with a traditional image denoising algorithm, the algorithm solves the problem of edge blurring caused by excessive smoothness of the image while denoising.

This utility model relates to the field of urine collection bag technology and discloses a urine collection bag for bladder irrigation in urological patients. It includes a lifting arm and a urine collection bag. A hook is fixedly connected to the middle of the upper surface of the lifting arm, and a warning light is installed in the middle of one side of the lifting arm. A power supply is installed inside the lifting arm. Slides are formed on both sides of the lifting arm. A conductive block is fixedly connected to one side of the bottom wall of the slide, and a spring is fixedly connected to the other side of the bottom wall of the slide. An inlet pipe is fixedly connected to one side of the upper surface of the urine collection bag, and a drain pipe is fixedly connected to the middle of the lower surface of the urine collection bag. This urine collection bag for bladder irrigation, through the design of an observation window and built-in scale lines, reduces the interference of bag deformation and light refraction on readings. Nursing staff can intuitively and accurately read the volume of irrigation waste fluid, ensuring accurate recording of intake and output balance, and providing reliable data support for assessing the patient's bladder irrigation effect, bleeding, and renal function recovery.

A broadband voltage transformer error compensation method is proposed. First, a broadband test platform is constructed using a signal generator, power amplifier, standard voltage transformer, and high-bandwidth data acquisition system. The ratio and phase errors of the transformer at multiple frequency points are acquired through primary-side excitation and secondary-side synchronous acquisition. Based on the slope, first derivative, and second derivative characteristics of the error curve, the entire frequency band is adaptively divided into segments. Within each segment, multiple candidate models are fitted using a polynomial or exponential-linear combination model. The optimal model is selected based on the coefficient of determination, mean absolute error, and root mean square error. Ratio and phase error compensators are constructed based on the fitting functions of each segment, and error compensation is achieved using a feedforward approach. This method can significantly reduce amplitude and phase errors over a wide frequency range, improving the dynamic measurement accuracy of the voltage transformer.

The present application discloses a material metering method, device, medium and equipment based on bulk weighing bills, which belongs to the technical field of material metering; according to the opening of the material outlet and the vibration frequency, the material outlet speed of the material bin is calculated; according to the material outlet speed, the first metering value of the material is calculated; the second metering value of the weighing pan is obtained; based on the opening of the material outlet, the material outlet speed and the second metering value, the third metering value of the material is calculated; according to the first metering value and the third metering value, the final metering value of the material is obtained by comprehensive calculation; that is, according to the opening of the material outlet of the material bin and the vibration frequency of the vibration motor, the material outlet speed of the material bin is calculated, and then the first metering value of the material is calculated, and the third metering value is obtained by combining the opening of the material outlet, the material outlet speed and the metering value of the weighing pan, and the final metering value of the material is obtained by combining the first metering value and the third metering value, and multiple influencing factors are considered in the metering process and the final metering value is obtained by combining the metering results from multiple angles to improve the metering accuracy.

The utility model is suitable for fluid metering technical field provides a kind of liquid mass metering device, including oil storage tank, oil inlet pipeline assembly and liquid weighing scale;Liquid level meter and electric heating unit are provided in oil storage tank;Oil inlet pipeline assembly is connected on oil storage tank, and oil inlet pipeline assembly includes oil inlet pipeline, and oil inlet valve is installed on the oil inlet pipeline;Oil outlet pipeline is connected between oil storage tank and target equipment, and oil inlet metering pump, liquid flowmeter and pressure detection component are sequentially connected on oil outlet pipeline along liquid flow direction;The liquid weighing scale is connected on oil outlet pipeline, and the liquid flowing through liquid flowmeter is metered;It further includes control system, the signal of liquid flowmeter is metered, and the measurement result of liquid flowmeter is checked and fed back using the measurement value of liquid weighing scale in the measurement process.The utility model solves the problem that the existing liquid metering equipment has low measurement accuracy and weak temperature control ability in the application of high viscosity and temperature sensitive oil.

The utility model belongs to the field of gas flow metering, and particularly relates to a gas flow metering device. The gas flow metering device comprises a cover body, a shell, a rectification part and a metering assembly, an opening is formed in the shell, the cover body covers the opening and forms an inner cavity, a flow passing opening is formed in the rectification part, the rectification part divides the inner cavity into a gas inlet cavity and a rectification cavity, the gas inlet cavity and the rectification cavity are communicated through the flow passing opening, and the metering assembly comprises a gas flow inlet. And the airflow inlet and the overflowing opening are staggered. According to the gas flow metering device, the reasonable layout of the rectification part and the staggered arrangement of the rectification part and the gas flow inlet act together to reduce the pressure loss of the gas flow in the metering process, so that the overall gas flow transmission efficiency and the metering accuracy are improved.

The application provides a method for online analysis of organic phosphorus and inorganic phosphorus in seawater, comprising: online sampling of seawater samples, establishment of a single-component digestion reaction kinetics analysis model of organic phosphorus and inorganic phosphorus at a characteristic wavelength; construction of a binary analysis model of total phosphorus at t1 or t2 time based on iterative addition of spectral absorbance; establishment of a water body background correction model to calculate the content of phosphate in the water body; coupling of the water body background analysis model to establish a binary analysis correction model of digestible total phosphorus; and continuous measurement of dissolved phosphate, organic phosphorus and digestible inorganic phosphorus in the water body based on the background correction model and the binary analysis correction model, so as to realize online continuous analysis of organic phosphorus, digestible inorganic phosphorus and phosphate components.

The utility model discloses a kind of quantitative feeders, including material barrel, the top of material barrel is provided with top cover, installation port is provided on the top cover;Blanking funnel, the blanking funnel is provided with blanking port, the blanking funnel is set in the bottom of the material barrel;Tray, the tray is set in the bottom of the material barrel, the tray is below the blanking funnel;Blanking pipe, the blanking pipe is telescopic sleeve, the upper end of blanking pipe is set in the installation port;Metering disc, the edge of metering disc is provided with multiple guide ribs, the guide rib is vertically arranged, through hole is provided on the metering disc, the through hole is connected blanking pipe;Sealing ball, the sealing ball is set in the material barrel and is configured to switch blanking port of blanking funnel. Realize the measurement accuracy of quantitative feeder is improved.

The invention discloses a voltage influence error suppression method, an electric energy meter and a storage medium. The method is applied to the electric energy meter and comprises the following steps: respectively adjusting the structure and parameters of a transformer, the structure and parameters of a manganese-copper diverter and the parameters of a metering chip; and the error variation of the electric energy meter is compensated and calibrated through the control module. From the aspect of hardware, the structure and parameters of the transformer are adjusted for an interference source, and the influence on other devices is reduced; aiming at an interfered device, the structure and parameters of the manganese-copper shunt are adjusted, so that the influence on the interfered device is reduced; parameters of the metering chip are adjusted, and relative interference is reduced. From the perspective of software, the actual error of the electric energy meter is compensated, and the voltage influence is further suppressed. By means of the method, the influence on the voltage is restrained from multiple aspects, the error change amount is stably controlled within 1% from the original standard limit value, the national standard is greatly exceeded, and the higher internal control index of an enterprise is met.

The application relates to the technical field of marine ecological disaster monitoring, and discloses a green algae area estimation method based on an unmanned aerial vehicle non-orthographic operation mode, which comprises the following steps: firstly, spectrum energy analysis is used to determine a sea state mode and to inversely calculate a basic wave height, a vertical non-uniform atmospheric extinction model is constructed to perform physical defogging; secondly, a fluid-solid coupling damping coefficient is inversely calculated based on texture entropy and glare characteristics, and a green algae microscopic equivalent mean square slope is corrected; finally, pixel-level macroscopic slant range projection, a wave shielding compensation factor and a microscopic surface area correction factor are comprehensively used, and a Sigmoid smoothing truncation weight function is combined to calculate a green algae physical total surface area. The application solves the measurement error caused by the non-uniformity of atmospheric medium, wave shielding and the absence of microscopic geometric characteristics under non-orthographic observation, and significantly improves the monitoring accuracy under complex sea conditions.

The present invention discloses an intelligent switching type electric energy meter, which belongs to the technical field of electric energy meters, and mainly includes a bottom shell, two wiring terminals are fixedly connected to one side of the inner wall of the bottom shell, and two switching terminals are arranged in front of the wiring terminals, the two switching terminals are fixedly connected to the bottom shell, and a frame slot plate is arranged on one side of the two wiring terminals, wherein a vertical constant pressure contact mechanism is arranged on the inner wall of the frame slot plate. The present invention adopts a vertical constant pressure contact mechanism, and starts two reduction motors through a controller, the distance between the two concave sleeve blocks increases, the distance between the two contact terminals on the inner wall of the switching terminal increases, and the tension value set by the tension sensor is the same as the tension value set by the controller. Then, the controller can connect the two reduction motors according to the specified contact force according to the wear area each time they are switched, so as to avoid poor contact after switching, and greatly improve the metering accuracy of the electric meter.

The present invention provides a synchronous electric energy meter error verification and correction method, medium and electronic device, belonging to the technical field of electric energy meters, comprising: collecting electric energy metering data of the electric energy meter and current, voltage and frequency signals of connected equipment; using a multivariate mixed decomposition method to decompose the collected current and voltage signals into fundamental and harmonic components; calculating the active load; detecting load waveform characteristics, such as the active resonance density of peak and valley points; establishing an electric energy meter error model considering voltage, current and frequency factors according to the load waveform characteristics; substituting the collected electrical parameter data into the error model to calculate the basic error of the electric energy meter; comparing the basic error with the actual error and correcting the error model parameters; iteratively obtaining a corrected error model; using the corrected error model to correct the measurement error of the electric energy meter; solving the technical problem that the prior art is difficult to correct the error of the electric energy meter for changes in power quality and load uncertainty.

The invention relates to the technical field of natural gas conveying, and particularly discloses a natural gas conveying and metering system and method and electronic equipment.The natural gas conveying and metering system comprises a base and a pipeline used for conveying natural gas, and the pipeline is installed on the base through a pipe support; the two ends of a pipeline are connected with an inlet gas collecting pipe and an outlet gas collecting pipe respectively, and natural gas enters the inlet gas collecting pipe from a gas source and then sequentially passes through an inlet isolating valve, an ultrasonic flowmeter, a pressure and temperature sensor and an outlet isolating valve to enter the outlet gas collecting pipe. A hoisting hole is further formed in the base, and the hoisting hole is used for hoisting the whole base to a ship body through hoisting equipment and installing the whole base. The natural gas conveying and metering system provided by the embodiment of the invention has remarkable beneficial effects in multiple aspects in the natural gas conveying and metering directions; in the aspect of installation, the whole base type design is convenient for integral hoisting installation, assembly in a workshop can avoid influence of complex environment on a ship site, working hours and manpower are remarkably saved, and installation difficulty and time cost are reduced.

The utility model discloses a calcium carbonate auxiliary agent quantitative atomization adding device, the utility model discloses a storage agent jar is equipped with the stirring paddle in the jar, the metering conveying subassembly that the ceramic plunger metering pump that communicates with the storage agent jar is formed, the atomizer of metering conveying subassembly is connected through the anticorrosive pipeline, its inside is equipped with the spiral atomization shower nozzle, still has the compressed gas source that the gas pipe connects the atomizer through the take steady voltage valve, flowmeter. In addition, the utility model still contains the support, and the liquid level meter has in the storage agent jar lateral wall, and the one -way valve has between metering conveying subassembly and the anticorrosive pipeline, and the polytetrafluoroethylene blowdown valve is equipped in the atomizer bottom. The utility model can accurate quantitative conveying auxiliary agent and high -efficient atomization, make auxiliary agent and calcium carbonate powder even mix, promote the modification effect, simple structure, convenient operation, and the practicality is strong, has the remarkable application value in the dry -process production heavy modified calcium carbonate field.

The utility model discloses a photoelectric sampling circuit and a counter. The circuit comprises a photoelectric emission module, a diagnosis module, a light reflection module, a photoelectric receiving module and a control module, the input end of the diagnosis module is connected with the first output end of the control module, and the output end of the diagnosis module is connected with the photoelectric emission module and the first interface of the control module; the input end of the photoelectric receiving module is connected with the second output end of the control module, and the output end of the photoelectric receiving module is connected with the second interface of the control module; the diagnosis module is used for controlling the photoelectric emission module according to a first signal provided by the first output end in a diagnosis mode, the light reflection module is used for reflecting light to the photoelectric receiving module when the photoelectric emission module emits light, and the photoelectric receiving module is used for forming a diagnosis signal according to a second signal provided by the second output end and the intensity of the light. The control module is used for performing photoelectric sampling circuit diagnosis according to the potential of the first interface and the diagnosis signal, thereby improving the metering accuracy and reliability of the photoelectric sampling circuit.

This invention relates to an automatic vehicle weighing system based on a dynamic transportation process, belonging to the field of vehicle load detection technology. The system includes: a data acquisition unit for real-time acquisition of deformation angle data from measuring points on the vehicle's suspension system and generation of timestamps and vehicle identifiers; a data processing and communication unit for data preprocessing, local caching, obtaining vehicle location and operating conditions, and enabling local storage to resume transmission when communication is interrupted; a background service and calculation unit, where a dynamic benchmark management module automatically identifies periods of no-load, stationary, and horizontal state, stores the acquired deformation angle data as dynamic no-load benchmark values, and automatically triggers benchmark updates when the deviation between the new benchmark value and the initial benchmark value exceeds a threshold; and a load calculation module calculates the vehicle's load weight based on real-time deformation angle data and dynamic no-load benchmark values, combined with a load calculation model. This system achieves high-precision, maintenance-free dynamic measurement of the vehicle-mounted weighing system and improves its adaptive correction capability against zero-point drift.

The invention discloses an orifice flowmeter, and relates to the technical field of flow detection. An orifice flowmeter includes a flow tube mechanism, the flow tube mechanism includes two symmetrical flow tubes, a metering assembly is arranged on the outer wall of the flow tube, an orifice assembly is inserted between the two symmetrical flow tubes, the orifice assembly includes a shell insertion mechanism, a blocking assembly is arranged on the inner wall of the flow tube, the shell insertion mechanism includes two shell plates, and a clamping column is fixedly connected on both sides between the two shell plates, and a middle hole is penetrated in the middle of the surface of the two shell plates, the orifice assembly also includes an inner liner assembly and an adjustment mechanism, the inner liner assembly is inserted through the middle hole and its two ends are connected to the flow tube through the blocking assembly, the inner liner assembly includes a guide mechanism, the guide mechanism includes a barrel belt, and the two end side walls of the barrel belt are uniformly penetrated with instrument holes, and the two ends of the barrel belt are symmetrically provided with connecting rings, and an orifice flowmeter can guide the turbulence caused by the obstruction of the fluid to reduce the induction error.

This invention discloses a loss-in-weight scale for improving weighing accuracy; relating to the field of loss-in-weight scale technology, it includes a support frame, a tank, and a tank cover. Multiple equidistant pressure sensors are installed on the periphery of the top surface of the support frame. A quantitative transmission mechanism is provided at the lower end of the tank, and a balancing component is installed on the upper end of the tank cover. This invention significantly improves weighing accuracy through the symmetrical arrangement of pressure sensors and a stable force transmission structure. Multiple equidistant pressure sensors installed on the periphery of the top surface of the support frame are rigidly connected to the tank through a positioning plate, ensuring that the weight of the tank is evenly transmitted to each sensor, avoiding detection deviations caused by single-point force. Simultaneously, the fixing effect of the positioning plate reduces interference from tank shaking to the sensors, making the weight signal more stable. The quantitative transmission mechanism of this invention achieves stable material transport through the synergistic effect of stirring and double-headed spiral pushing. By optimizing the material diversion and guiding structure, residue inside the tank and transport deviations are reduced, further improving measurement accuracy.

The invention relates to the technical field of engineering metering, in particular to a highway subgrade receiver collaborative metering system based on a live-action three-dimensional model, and the system comprises a data collection module which is used for the data collection of multi-source equipment, so as to obtain subgrade basic data; the data preprocessing module carries out standardization processing on the roadbed basic data to obtain preprocessed data; the live-action three-dimensional model generation module generates a roadbed model through an SfM algorithm and an MVS algorithm; the metering platform performs feature extraction on the roadbed model to obtain point location engineering quantity metering data, length engineering quantity metering data and area engineering quantity metering data; and the report module is used for acquiring data of the metering platform to generate a project quantity report. According to the highway subgrade receiver collaborative metering system based on the live-action three-dimensional model, point location, linearity and area engineering quantity metering can be integrated, and the problems that a traditional metering method is low in precision and low in efficiency are solved.

The application relates to the technical field of pipeline flow metering equipment, and discloses a pipeline noise reduction rectifying device and a pipeline flow metering system. The pipeline noise reduction rectifying device comprises a shell, an air inlet arranged at the front end of the shell, and an air outlet arranged at the rear end of the shell. The shell comprises a diameter expansion part and a steady flow noise reduction part arranged in sequence from front to rear. The inner diameter of the diameter expansion part gradually increases from the air inlet to the downstream. The inner diameter of the steady flow noise reduction part is greater than that of the air inlet. A front rectifying net is arranged on one side of the steady flow noise reduction part close to the air inlet. A steady flow ball is fixedly arranged on the steady flow noise reduction part and located on the rear side of the front rectifying net. The rear end of the steady flow ball is opposite to the air outlet. The pipeline noise reduction rectifying device can perform noise reduction and rectification on the airflow in the pipeline, create a stable measurement environment for the ultrasonic flow meter on the pipeline, and indirectly improve the measurement accuracy of the flow.

The utility model relates to a cut waste automatic metering device of a color-coated steel coil, which comprises a guide plate arranged behind a shearing device, the guide plate is positioned in front of a coiling mechanism, a displacement sensor A is arranged on one side of the guide plate and is used for detecting the position of the guide plate, and a pair of pinch rollers is arranged in front of the shearing device. Wherein one pinch roll is provided with a counting sensor, the counting sensor is used for metering the number of rotation turns of the pinch roll, the displacement sensor A and the counting sensor are both connected to a PLC, and the PLC is connected to an upper computer and is in communication connection with the upper computer. According to the utility model, the sensor and the PLC are arranged and are connected to the upper computer, so that the weight of cut wastes is automatically metered, the metering accuracy is improved, and the labor intensity is greatly reduced.

The invention belongs to the field of flow metering, and particularly discloses an ultrasonic water meter metering method based on EMD decomposition denoising, which comprises the following steps of: S1, giving a value interval of temperature in an ultrasonic water meter and a value interval of intensity of external electromagnetic interference; s2, when water flow in the ultrasonic water meter moves, extracting signal features and water flow velocity, and constructing a signal sample; s3, for the combination of the value interval of each temperature and the value interval of the electromagnetic interference intensity, adding all obtained signal samples into the same set to form a sample set; s4, constructing a water flow velocity prediction model based on the deep neural network, and training the water flow velocity prediction model by using the sample set; s5, in the actual ultrasonic water meter metering process, ultrasonic water meter metering is completed. According to the method, the mapping relation among the signal characteristics, the temperature, the external electromagnetic environment and the water flow velocity after EMD denoising is established, and accurate ultrasonic water meter metering is achieved.

The invention discloses a metering signal datum line establishing method of a photoelectric metering instrument. The metering signal datum line establishing method comprises the following steps: step 1, establishing an initial datum line; 2, refreshing the reference line when the maximum or minimum sampling signal amplitude continuously changes for multiple times; and 3, establishing an upper return difference reference line and a lower return difference reference line. The invention further discloses a metering signal datum line using method of the photoelectric metering instrument, before the upper return difference datum line and the lower return difference datum line are established, 1 is output if the amplitude of a sampling signal is larger than an initial datum line, and 0 is output if the amplitude of the sampling signal is smaller than the initial datum line; after the upper return difference datum line and the lower return difference datum line are established, if Vnmax is larger than or equal to the sampling signal amplitude and larger than the upper return difference datum line, 1 is output; if the lower return difference reference line is larger than the sampling signal amplitude value and is larger than or equal to Vnmin, 0 is output.

The utility model discloses a kind of electric wire cable length measuring devices, including measurement base, the top of measurement base is fixedly connected with portal frame, the portal frame is installed with the measurement component for cable length measurement, the top of the portal frame and the position corresponding the measurement component is installed with the limiting component for the cable to be measured limiting, the both sides of measurement base top are installed with the guide component for the cable to be measured guiding, the measurement component includes measurement shaft rotatably installed on the portal frame, metering wheel is fixedly connected on the measurement shaft, the end of the measurement shaft is installed with encoder. The utility model realizes the self-adaptive limiting clamping of different thick and thin cable and the self-adaptive adjustment of cable tension, effectively improve the accuracy and stability of cable length measurement, while having the advantages of stable structure, reliable operation etc., and has wide application prospect in electric wire cable length measurement field.

The invention provides a precise metering structure for an overload device, and relates to the technical field of hoisting overload, the precise metering structure comprises a support, a hinged shaft is mounted on the support, a cradle is rotatably mounted on the hinged shaft, the cradle is located below the support, a rotating shaft is mounted on the cradle, and a load power take-off pulley is rotatably connected to the rotating shaft; a cylindrical pressing type sensor is installed on the support through a threaded hole, and the sensing end of the cylindrical pressing type sensor is connected with the hinged shaft. The metering structure has the advantages that the load power take-off pulley is installed on the lower portion, the wrap angle of the steel wire rope can be changed, reverse bending of the steel wire rope is reduced, the service life of the steel wire rope is prolonged, the load power take-off pulley can rotate and move in the axial direction through the sliding bearing, and the load power take-off effect is improved. By installing the cylindrical pressing type sensor, the metering accuracy of the overload device can be improved, the using effect of the overload device is improved, and the overall using effect is good.

The invention discloses a compensation determination method and device and a direct current charging pile calibrating device. The method comprises the following steps: acquiring measured current values corresponding to a plurality of standard current values in the working process of the direct current charging pile; difference values between the standard current values and the corresponding measured current values are calculated, and current compensation values corresponding to the standard current values are obtained; and determining a corresponding relation between the current compensation values and the standard current values according to the plurality of standard current values and the respective corresponding current compensation values. According to the invention, the technical problem that the metering precision in a wide current range cannot reach a high standard due to hardware performance limitation and cost limitation is solved.