88 results about "Reservoir operation" patented technology

A computer-based system analyzes reservoir simulation results with a rule-based event monitor to trigger appropriate warnings in the event any of a number of applicable reservoir operation conditions is detected as likely to occur. The conditions may be automatically analyzed on multi-dimensional data during successive time steps to detect events indicated as needing attention or analysis and thus to alert reservoir engineers about operating conditions in the reservoir so that the engineers may make appropriate operational or simulation changes. The conditions may also be automatically analyzed in a batch processing mode of a set or subset of available time steps to detect and generate a log of events encountered that are indicated as needing attention or analysis.

The invention discloses a power generation risk-oriented hydropower station optimal operation chart drawing method. According to evaluation criterion and standard of a reservoir, the risk rate of the evaluation requirement cannot be met by adopting historical runoff series estimation, and a hydropower station operation chart scheme capable of increasing average power generation benefit and fully considering the power generation risk in a certain specified period (such as an evaluation period or a temporary operation period) is provided for a reservoir operation decision maker. The method can effectively coordinate the short-term benefit and long-term benefit of the reservoir and provides more decision information for the decision maker.

The invention relates to an optimal scheduling method of a nonlinear-programming cascade reservoir group based on a GAMS (general algebraic modeling system). The method comprises the following steps of: establishing an objective function; considering constraint conditions such as reservoir water balance constraints, related engineering constraints, related power generation constraints, other policy constraints, maximum constraint on minimum output, maximum constraints on guaranteed output, minimum constraints on differences between initial and final reservoir capacities in transition periods, and maximum constraints on assurance rates; and solving. According to the invention, runoff processes occurring in the past, artificially-generated runoff sequences and future runoff forecast processes are all taken as deterministic input processes of reservoir operation scheduling. The runoff description method can be used for intuitionally and visually reflecting the continuity and periodicity of runoff changes in a certain period, and indirectly reflecting the statistical properties of runoffs. According to given runoff data, the operation of solving is performed by virtue of a deterministic optimization model to obtain an ideal optimal operation process; and then, according to some criterion, a scheduling discipline function is identified from the optimal operation process and is used for guiding the operation of a hydropower system.

The invention discloses a method for calculating storage capacity of a reservoir, which belongs to the field of reservoir operation. The storage capacity of a traditional reservoir is obtained by taking the water level of a dam as a reservoir representative water level and calculating the capacity curve interpolation of the water level. In the method, a reservoir surface is a horizontal plane which takes the water level of the dam as a datum mark and neglects a backwater phenomenon at the tail end of the upper stream at a reservoir area as well as additional gradient influence along the upper stream and the lower stream of the reservoir. For a reservoir of a long narrow riverway type, the length-width ratio of the reservoir is very large, the additional gradient of the upper stream and the lower stream at the reservoir area is also large and the backwater phenomenon is obvious at the tail end of the upper stream, so that the storage capacity of the reservoiro, which is btained by calculating the interpolation according to a traditional method, has larger error and seriously affects the calculation accuracy of reservoir operation. By utilizing a dynamic water surface curve method, the invention carries out integral calculation on the basis of actually measured dynamic water surface curve materials collected at the reservoir area, and the integral calculation comprises three links: unit division calculation, telemetering water-level collection and segmented superposition calculation, wherein the unit division calculation is a core processing link, the telemetering water-level collection is a data reorganization and outfit link and the segmented superposition calculation is a result calculation link.

A river basin cascade reservoir and detention and retarding basin joint scheduling method comprises the following steps: S1, collecting the basic data of a river basin; S2, drawing a river basin flood risk chart and dividing risk areas; S3, acquiring precipitation, runoff forecast data and reservoir operation data of reservoirs and ranges in real time; S4, by taking the forecast and operation data in S3 as input, establishing and solving a reservoir group and detention and retarding basin joint real-time scheduling multi-objective optimization model; and S5, enabling detention and retarding basin compensation calculation. The method can give full play to the flood control and economical benefits of detention and retarding basins, and can be widely used in reservoir group and detention and retarding basin joint scheduling. Sustainable development of detention and retarding basins is taken into full consideration by enabling a compensation mechanism. A new scientific decision-making approach is provided for river basin flood control scheduling.

The invention relates to a data-free small reservoir parameter identification method combining hydrological simulation and continuous remote sensing images. The method comprises the following steps: step 1, determining a data-free small reservoir area and an upstream basin range; step 2, reservoir discharge parameters and a discharge curve are determined; step 3, verifying the reservoir dischargeparameters and the discharge curve; and step 4, identifying the reservoir operation mode. The data-free small reservoir parameter identification method provided by the invention not only identifies the reservoir area range and the weir crest elevation, but also provides a reservoir discharge parameter and discharge curve determination and verification method, thereby identifying the reservoir operation mode, and providing technical support for small reservoir flood discharge and small basin flood control in a data-free area.

The invention provides a water supply-power generation-ecological multi-objective scheduling graph optimization method based on ecological flow. The method comprises the following steps: 1, collectingreservoir long-series reservoir inflow runoff data, water demand data of a water supply area, downstream river channel ecological base flow data and an existing conventional scheduling graph; 2, determining a downstream river long-series ecological flow threshold interval by adopting a month-by-month frequency method; 3, constructing a water supply-power generation-ecological multi-objective scheduling graph optimization model; and 4, solving the optimization model by adopting an 'optimization-simulation' technology to obtain an optimization scheduling graph, and determining various benefit indexes and a reservoir operation process. According to the invention, the water supply-power generation-ecological multi-target scheduling graph optimization method combining the ecological flow threshold interval is proposed for the first time. The method can guarantee that the power generation flow, the discharge flow and the water supply amount are optimal scheduling results after power generation, ecology and water supply benefits are comprehensively considered, and a new thought is provided for achieving balanced coordination among multiple targets of reservoir water supply, irrigation, ecology and power generation.

The invention relates to the technical field of hydroelectric engineering ecological dispatching, and discloses a cascade power station ecological dispatching system suitable for producing drifting egg fishes, which is used for providing appropriate hydrological process conditions for drifting egg fish breeding and reducing the influence of cascade reservoir operation on the drifting egg fish breeding process. The method is based on the water level of a fish spawn spawning site and a fish spawn drifting river section; change in indicators such as flow, the upstream step is matched with the downstream step to adjust the water level of the fish spawning site and the fish egg drifting river section. Through the cooperative use of engineering measures and non-engineering measures, appropriatehydrodynamic process conditions are provided for the breeding of the fishes laying the drifting eggs, and the influence of the operation of the cascade reservoir on the breeding process of the fisheslaying the drifting eggs is reduced. The method is suitable for the ecological dispatching of the cascade power station nearby living fishes with drifting eggs.

The invention provides a management method of ecological flows river based on reservoir operation. The management method comprises the following steps: firstly, establishing a basic scheme, a compromise propose and an ideal scheme on the ecological flows management to be respectively suitable for the demands of high, medium and low water supply guarantee rate, and maintain health state of the basic, good and ideal ecological system of the river, simultaneously, dividing the capacity space of the reservoir to correspond to the management scheme of the ecological flows from top to down in sequence; then adopting a reservoir operation curve to guide so as to supply the water for the people and forming an integral reservoir ecological operation scheme by combining with the management scheme of the ecological flows; and finally applying a genetic algorithm, taking the water supply guarantee rate meeting the plan as the basic constrains and taking disturbance which reduces hydrologic regime of the river as an optimal target to optimize parameters of the reservoir capacity partition, dispatch curves and the like, so that the management scheme of ecological flows of the river based on the reservoir operation is obtained. The method can be suitable for demands of the different water supply guarantee rates, provide the optimized ecological flows process and effectively protect the ecological system of the river.

The present invention relates to an improved algorithm of water energy utilization improvement rate and cascade hydropower station dispatching benefit evaluation system, comprising the following steps: according to the monthly average water level of the actual operation of the reservoir in the past ten years, the dead water level of the reservoir design, the normal high water level of the reservoir design, and the reservoir dispatching diagram Data, calculate the monthly assessment index of the reservoir water level control coefficient, and inversely find the water level control target; calculate the actual power generation; calculate the assessment power generation according to the initial water level, interval flow, water level control target, and dispatching rules of the actual operating water level control coefficient of the reservoir; calculate the storage capacity Differential power; calculate the improvement rate of water energy utilization based on actual power generation, assessment power generation, and storage capacity difference power. The invention can improve the stability and adaptability of the electricity calculation results of the cascade hydropower station group assessment, and can avoid the situation that the water level will drop to the stagnant water level when the inflow of water is less at the beginning of the year, according to the dispatching chart. to good guidance.

The invention relates to a method for determining the amount of available surface water of a river basin facing to the protection of a river ecosystem, which comprises the following steps: firstly determining the minimum ecological water requirement of a river, selecting an AAPFD index to measure the disturbance degree of hydrological regime of the river, establishing reservoir operation rules which combine a reservoir operation curve with ecological flow operation rules, then applying the genetic algorithm to optimize three optimization variables of parameters of the reservoir operation curve, applicable ecological discharge flow of a reservoir in each month and monthly planned water supply amount of the river basin on the basis of ensuring the minimum ecological water requirement of the reservoir and the disturbance of the hydrological regime of the river in the acceptable range, and obtaining the maximum amount of available water supply, that is the amount of available surface water of the river basin. The method can fully ensure the health of the river ecosystem, simultaneously overcome the shortcoming that the traditional calculation method can not precisely calculate the amount of unavailable flood discharge during the flood season and more accurately determine the amount of available surface water of the river basin.

The invention discloses an intelligent optimization method and system for ecological operation of cascade hydropower stations, belonging to the technical field of efficient utilization of water resources and optimal operation of hydropower systems. The method comprises the following steps: establishing a cascade hydropower station reservoir operation model which takes the minimum ecological watershortage as an objective function and considers a complex constraint set; Knowledge rules are used to dynamically generate the initial scheduling process, and the initial population is generated by random disturbance in its neighborhood. All individuals are modified to feasible search space in turn, individual fitness value is calculated by penalty function method, individual position and velocityare updated dynamically, and neighborhood search is carried out by adaptive mutation strategy. The search process described above is repeated until the termination condition is met. The invention hasthe advantages of clear and simple principle, fast convergence speed and the like, and the obtained result is reasonable and feasible, and can provide strong technical support for rational allocationof hydropower resources.

The invention relates to the field of reservoir operation, and discloses an optimal operation method of a hydropower station group on the basis of an orthogonal dimensionality reduction search algorithm. The optimal operation method is characterized by comprising the following steps: carrying out encoding design to the hydropower station group by adopting a one-dimensional real number matrix, and obtaining dimensionality n; according to a state discrete number Q and the dimensionality n, constructing a corresponding orthogonal table; obtaining an initial operation process of each hydropower station by a conventional optimal operation method, and calculating to obtain an initial search step length by the state discrete number; according to the current state Z1 and the search step length of each hydropower station as well as the selected orthogonal table, constructing an orthogonal test scheme set, checking the corresponding state of each power station in each orthogonal test scheme, and correcting to a feasible region if border crossing happens; and calculating a target function value of each test scheme by adopting a penalty function method, and selecting an optimal test scheme Z2, wherein Z1 is caused to be equal to Z2 if a Z2 target function value is better than a Z1 target function. The invention has the advantages of being simple and clear in principle, few in calculation parameters, high in convergence rate, high in robustness and the like, and can be used for the optimal operation of a hydropower system and the optimal configuration of water resources.

The invention discloses a hydropower station deterministic optimal operation method based on a reference line and belongs to the technical field of hydropower. The hydropower station deterministic optimal operation method comprises the following steps that (1) a scheduling period is determined, and constraint conditions in the scheduling period are set; (2) a reservoir deterministic long-term optimal operation maximum generating capacity model is established; (3) based on the principle of reducing abandoned water energy and the loss of entering energy, an anti-abandoned-water line and a minimum decision boundary line are obtained; (4) the anti-abandoned-water line is correspondingly adjusted, and the optimal operation reference line is determined; (5) according to the optimal operation reference line, an optimal decision is obtained and used for guiding operation of a hydropower station. According to the hydropower station deterministic optimal operation method, experience of an expert and a reservoir operation rule are fused, and the method can be easily understood and grasped by operation personnel; a corresponding decision can be made at any moment according to the current water storage state of the hydropower station, and the hydropower station deterministic optimal operation method has a higher executable performance and a greater guiding significance.

The invention discloses a simulation operation method for a large-scale reservoir group in a main stream and tributaries of a river basin, and belongs to the field of optimal operation of a hydropowersystem. The method comprises the following steps that (1) construction of reservoir operation function is conducted, analysis of relevant factors affecting reservoir outflow is conducted, correlationanalysis is conducted, and determination of input factors of each reservoir operation function is conducted; (2) construction of a neural network model is conducted according to the input factors ofthe operation function, optimization of neural network parameters is conducted by adopting an adaptive moment estimation algorithm, training is conducted on the constructed neural network by using historical operation data of the reservoir, and the trained neural network is used as fitting function of the reservoir operation function; and (3) according to the fitting function of the reservoir operation function, a spatial topological structure and the constraints of the reservoir operation, the simulation operation model of the reservoir group is established to simulate the operation process of the basin reservoir group step by step. By means of the simulation operation method, the fitting accuracy is improved significantly, and the operation plan of the large-scale reservoir group in themain stream and tributaries of the river basin can be more accurately described in the case of the unknown operation law.

The invention discloses a water supply type reservoir operation chart dynamic control method based on runoff forecasting, and relates to the field of water resource management and water project management. The method comprises following steps: firstly, water supply dispatching calculation is carried out on all years time by time, and the problem of differences of typical year selection and the low assurance rate caused by few samples is solved; on the basis of a conventional water supply dispatching line calculation method, a control factor of a water coming situation is introduced, the opposite position of an operation line in an operation chart is selected as long-term, medium-term and short-term hydrological runoff forecasting, and dynamic control over the operation line under the different rich and low coming water situation; and the problem that according to an existing method, the typical year representativeness is insufficient, and forecasting incoming water is not considered is solved. The water coming and needing situation possibly appearing in reservoir water supply operation can be comprehensively covered, the water supply manner is dynamically controlled according to the rich and low condition of forecasting incoming water, and the aim of optimal utilization of water resources is achieved.

The invention relates to a reservoir level process smoothing method. The method includes the steps of processing actual reservoir level measurement process; calculating the process of equal-duration level time sequences; and selecting different process outputs according to parameters. Level data with fluctuation anomaly during the smoothed reservoir level process can be filtered, smooth reservoir level output process is guaranteed, and reservoir operation conditions are reflected more really. Abnormal data such as negative flow and jagged fluctuation can be avoided by subjecting the smoothed reservoir level process to entry flow reversing, and calculating accuracy can be improved effectively. The requirements for installation position and precision of level meters on reservoir dams can be lowered moderately by the use of the method, and cost in construction and management of level observation stations is lowered. The reservoir level process smoothing method is universal and adjustable and meets the requirements of various reservoirs for smoothing of actual level measurement process.

The invention discloses a method for generating a reservoir optimal dispatching decision model based on depth learning, and relates to the the field of reservoir dispatching technology. Based on the Depth learn algorithm, the historical operation rules of reservoirs are extracted from the historical operation data of reservoirs, while optimizing the computational accuracy of the reservoir dispatching model, the computational time-consuming of reservoir operation model is optimized, The method can quickly extract reservoir dispatching rules from massive historical dispatching data, and is suitable for real-time dispatching of reservoirs and short-term, medium-term and long-term dispatching of reservoirs, and improves the calculation precision, calculation efficiency and practicability of the reservoir dispatching model, and solves the defects of low calculation precision, low calculation efficiency and low practicability existing in the prior art.

The invention discloses a two-stage stochastic optimal operation method of a hydropower station reservoir based on the residual period benefit function approximation, which comprises the following steps of dividing the hydropower station reservoir operation period into a current stage and a residual period, and constructing a two-stage decision model framework; considering the influence of residual water situation and residual storage capacity on residual benefit, constructing the approximate function of residual benefit; based on stochastic dynamic programming (SDP), proposing a stepwise iterative method to obtain the approximate residual benefit function; according to the actual runoff forecasting level, establishing a two-stage stochastic optimal scheduling model. The method of the invention avoids the dimension disaster of the SDP, takes the artificial neural network as the approximator of residual period benefit function, avoids the artificial assumption of residual period benefitfunction, and can obtain the continuous curved surface of residual period benefit. The two-stage stochastic optimal dispatching model transforms the multi-stage reservoir dispatching decision-makingproblem into a two-stage optimal decision-making problem, which can be directly used to guide the rolling updating of medium and long-term generation plans.

The invention discloses a reservoir operation-for-beneficial-use chart optimization method considering ecological protection needs. The method includes the following steps that: the basic informationdata of a hydropower station reservoir are obtained; representative fishes are selected, a physical habitat simulation model (PHABSIM) is adopted to establish a relationship between discharged flows and ecological protection levels, an ecological flow interval corresponding to an ecological protection objective is determined; a reservoir operation chart optimization model is established on the basis of power generation benefits and ecological benefits; with reservoir runoff adopted as the input of the reservoir operation chart optimization model, a DPSA (dynamic programming with successive approximation) method is used to solve the model; and ecological limit lines are drawn, an ecological limit line and reservoir operation curve-combined reservoir operation rule is established, and a multi-objective optimization operation chart is compiled. According to the reservoir operation-for-beneficial-use chart optimization method considering ecological protection demands of the invention, different ecological objectives are optimized through adopting different flow intervals according to the different growth periods of fishes, which is more in line with an actual situation; and the ecological limit lines are additionally adopted, and therefore, the depth of ecological flow destruction can be reduced, and the protection of downstream ecology can be enhanced.

The invention provides a reservoir multi-level management mobile application system based on cloud service. The reservoir multi-level management mobile application system is characterized by comprising a data acquisition layer, a data conversion layer, a cloud service platform layer and a mobile application layer, wherein the data acquisition layer is deployed on a reservoir site, different instruments or devices are installed according to needs to obtain reservoir dam real-time monitoring reservoir information, and the data types of the reservoir information comprise engineering characteristics, water conditions, rain conditions, dam safety monitoring, flood forecasting and dispatching, gate monitoring, video monitoring, personnel materials and operation management information; and storing the reservoir operation original data acquired by the data acquisition layer in an original database. The invention aims to provide a reservoir multi-level management mobile application system basedon cloud service, so as to improve the timeliness and convenience of reservoir dynamic supervision of each level of reservoir management department, break through the limitation of reservoir management in professional technology and time space, and fundamentally solve the problems of reservoir multi-level real-time dynamic supervision and the like.

The invention discloses a reservoir silt-preventing laying method which is characterized by including the steps of firstly, using upstream cofferdams and diversion tunnels during reservoir construction as facilities for silt conveying during reservoir operation; secondly, selecting a side on the upstream of a dam to building a silt blocking reservoir cofferdam to allow silt in a river to deposit in the silt blocking reservoir; thirdly, setting a plurality of silt conveying branch pipes on a sand conveying main pipe, disposing an ultrasonic depth meter and an electric valve on each silt conveying branch pipe to measure silt elevation, and opening the electric valves by turns to remove and discharge silt; fourthly, allowing a control cabinet to be respectively connected with the ultrasonic depth meters and the electric valves through cables, collecting the silt elevation of each branch silt conveying pipe in real time by the control cabinet, and automatically opening the electric valve of the branch silt conveying pipe high in silt elevation to discharge the silt; in the meantime, accepting operation instructions to discharge the silt. By the reservoir silt-preventing laying method, the active effect of preventing reservoir siltation can be achieved, and a reservoir can be effective continuously and stably.

The invention discloses a method and a device for predicting productivity of a gas storage gas water interaction area. The method comprises the following steps of determining the function relation between gas reservoir pure water influx and pressure, and according to the function relation, determining a study target well positioned in the gas water interaction area in a gas storage operation rebuilding process; processing gas reservoir development data or well test data of the study target well to obtain a gas well binomial deliverability equation, and determining the productivity-reducing influence factors of gas water interaction displacement; according to the productivity-reducing influence factors of gas water interaction displacement, designing a seepage test in a gas reservoir building process, and testing the change state of the gas phase permeability in each cycle of the designed service life of a gas reservoir; correcting the gas well binomial deliverability equation by the seepage test result to obtain the productivity of the study target well from which the seepage ability lost by gas water interaction displacement in a gas reservoir operation process is deducted. According to the method and the device provided by the invention, the accuracy of well productivity prediction of a water logging gas reservoir rebuilt gas reservoir can be improved.

The invention provides a method for fast calculating the electric energy production of a hydropower station. The method mainly comprises the following steps of: selecting a historical runoff series; determining a reservoir operation mode of the hydropower station; and building a relationship between the effective runoff and the electric energy production to calculate the electric energy protection of the hydropower station. The method has the advantages that an effective runoff index is provided for the first time; after one-time modeling, the effective runoff index can be directly obtained through calculation of runoffs at different periods, and the use of other parameters is not needed; according to the electric energy production-effective runoff mutual conversion relationship provided by the invention, in the given reservoir operation mode of the hydropower station, the corresponding annual electric energy production can be obtained through simple calculation or table look-up after the inflow water condition is converted into the effective runoff; the annual electric energy production in the given reservoir operation mode can be simply and fast calculated; and the application scenes are wide.

The invention relates to the technical field of cascade reservoir operation, in particular to a cascade reservoir optimal operation method based on cascade reservoir operation coefficients, which is characterized by comprising the following steps of: 1, calculating the cascade reservoir operation coefficients; 2, establishing a cascade reservoir operation coefficient optimization model; and 3, carrying out comprehensive solution. The method has the beneficial effects that two indexes of the reservoir peak distribution coefficient and the base load coefficient are provided, and how to distribute the residual electric quantity of the system among the cascade hydropower stations in the research period and how to distribute the total power generation capacity of the hydropower stations in timesequence are determined. The minimum of the maximum output power shortage rate in a month is taken as an optimization target; conditions such as cascade reservoir output constraint, reservoir capacity constraint, flow constraint and hydraulic relation constraint are considered, an optimization model of cascade reservoir operation coefficients is established, a cascade hydropower space-time optimization distribution result is obtained through solving, and the method has important guiding significance for long-term planning and construction of a new energy base.

The invention provides a graded and staged drought limit water level design and control method for a reservoir, and belongs to the technical field of drought control scheduling. Firstly, a water supply guarantee target is analyzed and water supply requirements are designed. Secondly, reservoir runoff processes of different early warning levels are designed y examining the reliability, consistency and representativeness of long-series hydrological data; and the seasonal characteristics of factors such as reservoir runoff, reservoir operation water level and water supply demand are comprehensively considered, and drought early warning and staging are carried out on hydrological years. Thirdly, according to the designed water demand process and the water supply guarantee priority, a graded and staging drought limit water level water supply rule is determined, and graded and staging drought limit water levels are preliminarily determined; and finally, based on long-series runoff process simulation, grading and staging drought limit water level rationality analysis and adjustment are carried out. According to the rationality analysis method based on long-series simulation and the reservoir drought limit water level feedback correction method, the requirements for the system water supply guarantee rate and the damage depth in engineering application can be comprehensively considered, calculation is rapid and convenient, and the method is suitable for engineering application and popularization.

The invention discloses a method for extracting reservoir dispatching function based on joint probability distribution. By collecting reservoir basic data and long series of measured runoff data, theoptimal dispatching process sample series are obtained by deterministic optimal dispatching of reservoirs. The marginal probability distribution functions of decision variables and state variables aredetermined, and the joint probability distribution functions of decision variables and state variables are constructed by using Copula function, then the conditional probability distribution functions of decision variables are deduced when the state variables are given, and the reservoir operation functions are extracted and the uncertainties are analyzed. The reservoir dispatching function extracted by the invention can accurately capture the inherent non-linear and heteroscedasticity correlation structure of the decision variable and the state variable, and the calculated confidence interval estimation value can quantitatively evaluate the uncertainty of the reservoir dispatching, thereby providing a beneficial reference basis for the decision risk analysis.

The invention discloses an emulated data simulation method for a reservoir operation automatic system. According to the method, through analyzing to-be-simulated and generated data required by the reservoir operation automatic system, an actually running reservoir operation automatic system is simulated and various running scenarios are designed. The simulated and generated data are composed of various raw data on water level, rainfall, unit active and reactive power, unit sate, water-affairs calculation result, hydrologic information, messages and the like. Various running scenarios are designed for system simulated training or system commissioning test. Therefore, the scenario reproduction process for the reservoir operation automatic system is accelerated in different inflow conditions. The training quality and the training efficiency are improved, or the outgoing quality of the reservoir operation automatic system is increased. Meanwhile, the on-site system operation efficiency is increased.

The invention discloses a portable water level measuring device for water conservancy project reservoir operation management, which belongs to the technical field of water conservancy projects. The portable water level measuring device comprises a base, rotating frames are fixedly connected to the two sides of the upper end of the base, winding end plates are rotatably connected to the inward sides of the two rotating frames, a winding drum is fixedly connected between the winding end plates, a measuring chain is spirally wound on the winding drum, the measuring chain comprises a plurality of telescopic chain links, a connecting rope and a measuring core rope, the two sides of each telescopic chain link are fixedly connected with chain link hanging lugs, and the telescopic chain links are connected end to end. By arranging the measuring chain, when the measuring chain is used for measuring, a fixed rod body structure can reduce measuring errors caused by deformation of a measuring end during unwinding measurement, the accuracy of a measuring result is improved, reverse operation during winding can separate telescopic chain links, winding of the measuring chain is facilitated, the device is convenient to store and carry, and the practicability of the device is effectively improved.