222results about How to "Clear design ideas" patented technology

The invention discloses a system method for intelligent control over the continuous-casting process. Firstly, signals are collected to form a data center; then a temperature field model is designed to calculate the temperatures of continuous-casting key process nodes, and the temperatures of the continuous-casting key process nodes are stored into the data center; then logistics tracking of the continuous-casting process is achieved, and a 'casting blank-technological parameter and event' related database is formed; then rules and dispatching command information are obtained through data mining and artificial expertise, and virtual reality animation displaying of the equipment state, process operation state and command execution state is conducted; then a casting blank quality online grading system is built and casting blank grading is achieved; and finally, a coordination control system is built, energy consumption and water consumption are optimized, and large-closed-loop quality control and underlying loop control are achieved. Energy conservation and consumption reduction are achieved by optimizing the related parameters of energy consumption and water consumption while the effects that the continuous casting blank quality is stable and the quality is improved continuously are ensured, so that the yield is improved, the cost of per ton of steel is reduced, the comprehensive production cost is reduced continuously, and normal and efficient operation of continuous casting is ensured.

The invention relates to the field of power system devices, in particular to a novel monitoring and protecting system for a test thyristor of a converter valve module. The system provided by the invention comprises thyristor electronic equipment (TE), valve-based electronic equipment (VBE), a control protection system and the like. The control protection system computes the triggering angle of the thyristor according to the current operation condition of a converter valve and sends the triggering angle to the VBE, the VBE generates a triggering coded pulse and sends the triggering coded pulse to the TE, and the TE generates a triggering pulse and sends the triggering pulse to the thyristor, thereby triggering the thyristor. The TE generates a monitoring and protecting return pulse according to the state of the thyristor, the return pulse is transferred to the VBE through an optical fiber, the VBE gathers the uploaded state information, then the gathered information is uploaded to the control protection system through a CAN (Controller Area Network) bus, and the control protection system finishes the process of monitoring the state information of the valve module thyristor level. In the normal operation process of the converter valve, if the voltage received by the thyristor exceeds the tolerance capability of the thyristor, the thyristor can be damaged possibly, thus the protection technology of the thyristor is very important. The control protection system, the VBE and the TE finish the protection of the normal operation of the converter valve module.

The invention discloses an optimized configuration method of distributed power generation considering energy storage and considering photovoltaic randomness, comprising the following steps: firstly, based on kernel density estimation and K-means clustering method, according to a large number of historical photovoltaic output data, building a typical day scene generation method of distributed poweroutput; Furthermore, based on the theory of bilevel programming, a bilevel programming model of distributed generation is established, which combines the planning with the operation from the perspective of comprehensive social benefits and power company benefits, respectively, on the basis of the goal of the lowest annual total cost in the upper layer. Finally, the stochastic scenario generationis combined with the distributed generation bilevel programming model, and the optimal configuration scheme of distributed generation that meets the load demand is obtained by intelligent optimizationalgorithm. The bilevel programming model proposed by the invention can provide an optimal configuration scheme of distributed power generation including configuration node and capacity from differentbenefit parties, thereby effectively reducing the total annualized cost of the system.

The invention provides a universal calibration method for transmission path delay errors of a parallel ADC sampling system, and aims to provide a universal method capable of adapting to sampling frequency changes and correcting multichannel data input delay. According to the technical scheme, a clock and a signal are configured into multi-channel output through an AD chip integrated with M channels, and an AD is connected with an FPGA through a serial peripheral interface to form a high-speed variable sampling rate system. The AD performs multi-channel parallel sampling on high-speed signals to realize first-stage speed reduction, and the FPGA performs serial-parallel conversion by adopting serial-parallel conversion primitives or serial-parallel conversion IP cores to realize second-stagespeed reduction. After the FPGA configures an AD to send a test sequence, a calibration instruction and a state machine are started, a time delay parameter calibration algorithm is operated, time delay parameters are dynamically placed into an FPGA input time delay control primitive, all data lines in channels and among the channels are aligned, the AD exits from the test sequence to output actual signals, and system input time delay calibration is completed.

The invention discloses a unit testing method. The method comprises the following steps of: representing the logical structure of a software unit by behavior; respectively designing test case data of the software unit according to each behavior; compiling a test function of the software unit; and testing the software unit according to the test case data and the test function. The invention also discloses a unit testing device, comprising a first input module and a testing module, wherein the first input module is used for inputting the behavior for representing the logical structure of the software unit, the test case data of the software unit and the test function of the software unit, and the testing module is used for testing the software unit according to the test case data and the test function. By adopting the method and the device of the invention, the design train of thought of the test case can be simple and clear.

The invention relates to a composite material forming technology and specifically relates to a high-precision forming mold and method for thickly-laid composite material boxes. The high-precision forming mold for thickly-laid composite material boxes is designed in the present invention and comprises a box bottom female die (1), a box body sidewall pressure transfer block (2), a knockout plate (3), a box sidewall female die (4), a male die (5) and a bottom plate (6). On the basis of the high-precision forming mold for thickly-laid composite material boxes, box prepreg layers of a composite material are laid one by one on the male die (5); every two to three prepreg layers are vacuumized and pre-compacted, and a plurality of times of vacuumizing and pre-compacting are carried out until the prepregs are completely fitted with the die; subsequently, more than three times of pre-pressing by using a press are carried out, followed by a process of opening the mold to supplement materials and shaping, and hot press molding. The accuracy of inner and outer molded surfaces of a composite material box formed by using the mold and the method of the present invention can be above + / -mm, and therefore, the composite material box can be glued in an aerospace part as a force-bearing part and may meet later assembly requirements.

A real-time calculation method of abrasion loss of a disc cutter of a hard rock tunnelling boring machine (TBM) provided by the invention relates to a data processing method particularly suitable for specific application. From the aspect of mechanical analysis of hard rock hobbing cutter rock breaking, a relationship between a cutting coefficient and a hobbing cutter rock breaking arc length is established, and the real-time calculation method of abrasion loss of the hobbing cutter in the tunneling process of a hard rock TBM is realized through adoption of tunneling parameters automatically acquired in the work process of the hard rock TBM. The real-time calculation method comprises the steps: performing real-time calculation of an equivalent hobbing cutter cutting coefficient and a knifing of a TBM cutter; performing real-time calculation of an angle with respect to the equivalent hobbing cutter rock breaking arc length; performing real-time calculation of an equivalent hobbing cutter working radius; performing real-time determination of the abrasion loss of the equivalent hobbing cutter in the tunneling process of the hard rock TBM; and performing real-time determination of the actual abrasion loss of a hobbing cutter at any one cutter spacing on the hard rock TBM cutter. According to the invention, the real-time calculation method helps to make up the deficiencies in the prior art that abrasion of a hobbing cutter of the hard rock TBM in the tunneling process cannot be directly detected in real time and the abrasion loss of the hobbing cutter of the hard rock TBM in the tunneling process cannot be reflected.

The invention discloses a multi-energy complementary microgrid energy storage optimized configuration method based on double layers of optimization models. The method comprises the steps of (1) constructing an upper layer optimization model with the economy of the energy storage device of a multi-energy complementary microgrid system in an off-grid state as a goal and the consideration of maximum output power constraint and ramp rate constraint, (2) constructing a lower layer optimization model with the economy and environmental protection of the multi-energy complementary microgrid system in a grid-connected state as a goal and the consideration of factors of power balance constraint, power constraint and the like, and carrying out single objective processing on a double-goal problem by using a random weighted method, and (3) carrying out normalization processing on the adaptive values obtained by the upper layer optimization model and the lower layer optimization model, and facilitating the weighted calculation of a final result. According to the method, the energy storage configuration requirement of multi-energy complementary system in an off-grid mode and the operation state in a grid-connected mode are considered at the same time, the improvement of the efficiency and economy and energy storage and capacity configuration are helped, and a microgrid energy storage optimized configuration model with the comprehensive consideration of off-grid and grid-connected operation modes is established.

The invention provides an intelligence material storage device which solves the problems that in the prior art, a file box is not turned over for a long time, and mildew or insect pests can be generated at the bottom. The device comprises a cabinet, the interior of the cabinet is divided into a plurality of storage grids through a plurality of vertical plates and a plurality of transverse plates;the plurality of transverse plates are bottom plates of the plurality of storage grids respectively; each of the multiple transverse plates is a structure with an inner cavity and an opening in the upper end. A ventilation device is mounted in a transverse plate at the bottom of each storage grid; The ventilation device comprises a first bottom plate and a second bottom plate; the first bottom plate and the second bottom plate are installed in the transverse plates in an up-down sliding mode and are composed of a plurality of bottom rods, a first rack and a second rack are fixed to the bottomof the first bottom plate and the bottom of the second bottom plate, and driving half gears located between the first rack and the second rack are rotatably installed on vertical plates on the two sides of each storage grid respectively. Through the first bottom plate and the second bottom plate, ventilation of the bottom of the file box is achieved, and the phenomenon that the bottom of the filebox is mildewed or damaged by pests during long-term storage is avoided.

The invention belongs to the field of electric power systems, and particularly relates to a method for evaluating relay protection states. The method includes the steps: firstly, determining single state quantities of state evaluation to acquire acquisition; secondly, building a hierarchical state evaluation system; thirdly, computing constant weight coefficients and variable weight coefficients of the single state quantities according to association rules and variable weight theories; fourthly, building membership functions of the single state quantities for state rates by a fuzzy distribution method, building a fuzzy relation matrix, and gradually computing fuzzy comprehensive evaluation result vectors; finally, judging the running state of a relay protection device according to a maximum membership principle. The influence of expert opinion subjectivity on the weight coefficients is avoided, the method contributes to solving the problem that a real running state of the relay protection device cannot be reflected by the constant weight coefficients, an accurate and simple relay protection state evaluation result is provided for operators and can serve as a state maintenance basis, the design thinking is clear, programming is easily realized, and transplantation between different programming environments is facilitated.

The invention relates to a low-power-consumption power supply system for a wireless sensor network. A single-chip microcomputer enters in different work states according to the data request state of a gateway, a data collecting front end and a signal conditioning module are controlled to be powered on and off, under the condition of having no data requests, the single-chip microcomputer sleeps and enters in a low-power-consumption mode, and the whole data collecting front end and the signal conditioning module are disconnected with a power supply. When data request signals are received by a wireless receiving module, the wireless data receiving module rouses the single-chip microcomputer to enter in a data collecting state, data are sent to the wireless gateway after being collected, and when no continuous data requests exist, the single-chip microcomputer enters in the sleep state again until the next data requests come. According to the data request state of the gateway in the wireless sensor network, the single-chip microcomputer works in the two modes of sleep and data collecting, the data collecting front end is controlled to be powered on and off according to the request state of the gateway, and then the aim of lowering power consumption is achieved.

The invention provides a design method for an output feedback controller with a time varying sampling period. The method comprises the steps of setting time delay of a network control system to be a constant value and to be less than a sampling period, wherein a time varying sampling period is bounded, packet loss meets a Bernoulli random sequence and the probability is known; discretizing an original linear time invariant network control system and obtaining a discrete time varying system with uncertain items through conversion; obtaining the maximum singular value of a matrix and a conjugate transpose matrix through solving to obtain parameters in the discrete time varying system; according to state variables received by a controller and the obtained parameters in the discrete time varying system, building a dynamic output feedback controller; combining the built linear matrix inequality and the Lyapunov stability principle, solving the matrix in the feedback controller to determine and obtain a dynamic output feedback controller. The method takes into consideration the instability of sampling periods of network control systems, has the advantages of clear design thought, high stability and simple operation and can be applied to engineering practices.

The invention relates to an alkali-resistant compound microorganism pretreatment fungicide for pulping wheat straw and application of the alkali-resistant compound microorganism pretreatment fungicide. The alkali-resistant compound microorganism pretreatment fungicide comprises bacillus licheniformis, alcaligenes faecalis, Lysinibacillus sp., bacillus subtilis and bacillus cereus, the mass ratio of all bacterial strains to bacterial liquid is (1-3): (1-3): (1-2): (1-3): (1-3), in biological pretreatment of wheat straw, all the bacterial strains are mutually beneficial, symbiotic and synergistic interaction is achieved, and the efficient degradation of cellulose, hemicellulose and lignin is jointly promoted. According to the method, the biological pretreatment chemical pulping method is adopted for pulping, and the alkali-resistant compound microorganism pretreatment fungicide is used for biological pretreatment pulping, so that the use of a large amount of chemical preparations is avoided, the discharge of wastewater in the traditional chemical pulping process is reduced, the production cost of an enterprise is reduced, and the method is advanced in technology and environment-friendly at the same time.

The invention discloses a design of a novel direct-current converter valve thyristor damping loop, which can meet all requirements on electrical designs. The damping loop consists of a direct-current voltage-equalizing resistor, a damping resistor and a damping capacitor, wherein the direct-current voltage-equalizing resistor plays a role in equalizing the voltage of a converter valve and provides a loop for voltage detection of a circuit board. The damping capacitor consists of three capacitors, wherein one damping capacitor plays a role in dividing a voltage; one damping capacitor and the damping resistor are connected in series to form a damping loop; and another damping capacitor is connected in series with a quick energy-taking loop resistor to form a quick energy-taking loop of a thyristor testing and monitoring (TTM) unit. By the novel design method, the design of the direct-current converter valve thyristor damping loop is simplified as possible in the situation of meeting requirements.

The invention relates to non carry borrow n value arithmetic device design method. It uses depreciation design method, divides the n value arithmetic Ph(N) truth table Lk(n) into a set of primitive table BLh(n) superposing type, respectively designs out arithmetic primitive Ah(n), uses superposing type to superpose each arithmetic primitive Ah(n) to form n value arithmetic device Ph(n). The invention has conventionalization and standardization design process, suits for fast or auto design, base device reconstruction and multiplexing. This method can be used in various non carry borrow n value arithmetic devices design.

The invention discloses a power grid development dynamic comprehensive evaluation method based on a Bayesian network. At present, the evaluation method for power grid development still needs further study. The power grid development dynamic comprehensive evaluation method comprises the steps of: selecting a power grid development evaluation index, and constructing a power grid development level evaluation index system; preprocessing collected index historical data, and carrying out index normalization processing and index dimensionless processing separately; constructing a Bayesian power grid evaluation network model; calculating sample data comprehensive evaluation scores by adopting an electric power dynamic comprehensive evaluation method based on motivation or punishment to obtain a power grid comprehensive evaluation value, and regarding the power grid comprehensive evaluation value as a training sample of the Bayesian power grid evaluation network model; training the constructed Bayesian power grid evaluation network model to obtain a trained Bayesian power grid evaluation network model; and inputting a test sample for testing. The power grid development dynamic comprehensive evaluation method can calculate to obtain an objective and precise power grid development evaluation result, and can make a reasonable evaluation of the power grid development.

The invention relates to a traffic signal control system, particularly to a deceleration warning system at a gateway of a trunk road. The deceleration warning system comprises an induction unit, an integrated coordination control module and a deceleration warning unit. The induction unit consist of a cell inlet-outlet access device, infrared detector, or / and a vehicle turning detection unit. The deceleration warning unit includes a vehicle deceleration yellow-flashing warning lamp (1) arranged at a place, approaching a driving direction of one side of a cell, of a trunk road and a vehicle deceleration yellow-flashing warning lamp (2) arranged at a place, far away from the driving direction of one side of the cell, of the trunk road. The integrated coordination control module receives detection signals from the cell inlet-outlet access device (4) or / and the infrared detector and the vehicle turning detection unit, determines right turning or left turning of a vehicle being driven out of the cell, and outputs a control signal to the deceleration warning unit, so that the vehicle deceleration yellow-flashing warning lamp (1) or the vehicle deceleration yellow-flashing warning lamps (1) and (2) works / work and thus a vehicle on the trunk rod to slow down. Therefore, a vehicle driven out of the cell can pass through an intersection rapidly and safely.

The invention discloses a polyolefin nanometer fiber film sensor for rapid bacterium detection and a preparation method thereof. According to the invention, polyolefin copolymer is adopted as a substrate material, and the chemically-modified polyolefin nanometer fiber film biosensor is prepared by surface chemical modification, and solid phase synthetic process of bioactive molecules. The nanometer fiber film biosensor prepared by the method of the invention overcomes, with respect to performance, the disadvantages of time consumption, manpower consumption, poor accuracy for bacterium culture and bacterial colony counting in traditional bacterium detection, realizes rapid detection of ATP released by bacteria by using the luminescence principle between triphosadenine, luciferase, and fluorescein, and realizes rapid response to biological harmful substances. With the solid phase synthesis, bioactive enzymes are well fixed on the surface of the nanometer fiber film, which realizes repeated and circular detection of bacteria. The nanometer fiber film sensor is widely applicable to fields of biotechnology, medical health, food and medicine detection, water treatment, and the like.

The invention provides a multi-point photovoltaic output probability prediction method based on a Pair-copula theory. The method comprises the steps of: performing cluster analysis on a target photovoltaic power station group to determine the optimal number for classification; performing statistics of the photovoltaic output values of various power stations and a photovoltaic power station total output value to obtain a probability density function and a cumulative distribution function respectively; performing parameter identification of a two-dimensional Copula function for the output of various power stations and the total output to obtain a series of partial correlation coefficients; solving a related coefficient of a Pair-copula function according to a formula; and employing the determined Pair-copula model and the prediction value of the photovoltaic output of each power station to obtain multi-point distributed photovoltaic joint output condition probability distribution. The clustering analysis theory is introduced to classify the photovoltaic power stations. Based on the Pair-copula theory, a conditional probability prediction model of the joint output is established to solve the problem of multi-point distributed photovoltaic combined output prediction.

The invention discloses a smokeless coal-charging gas collecting pipe pressure intelligent control system. The smokeless coal-charging gas collecting pipe pressure intelligent control system comprises an internal and external interface system, a data processing system, an intelligent computing center system, an execution system, a data collection center system, a central control system, a client end and a working condition signal processing module, wherein the internal and external interface system is electrically connected with the data center system in a bidirectional way; the data center system is electrically connected with the intelligent computing center system in a bidirectional way. The smokeless coal-charging gas collecting pipe pressure intelligent control system has the advantages that the defects of lack of feedforward analysis, data mining and coordinated control and higher energy consumption are overcome; the energy is saved, the consumption is decreased, the pressure of a gas collecting pipe is stabilized, the surge of a fan is treated, the pollution to environment is reduced, the chemical production efficiency is improved, the production cost of enterprises is reduced, and the requirement of environment change is met; the accuracy is good, the stability is high, the applicability is strong, and the subsequent maintenance and upgrading is convenient.

The invention discloses a method for optimizing key parameters of a bearingless permanent magnet motor considering both suspension force and torque. The method comprises the following steps that 1, the design parameters of the bearingless permanent magnet motor are selected according to design requirements; 2, the suspension winding pole-pair number PB and the torque winding pole-pair number PM of the bearingless permanent magnet motor are determined, and in addition, PB is equal to PM+ / -1; 3, the calculated value of the maximum suspension force is obtained by a finite element method; 4, the calculated value Fmax of the maximum suspension force obtained in the step 3 is compared with the suspension force design requirement value FmaxN, when the calculated value does not conform to the design requirement, namely the absolute value of the difference value of Fmax and FmaxN is greater than Xi, Xi is the design precision requirement of the maximum suspension force, the conversion coefficient Cred (Cred is greater than 0 but is smaller than 1) is increased or decreased, then, the repeated iteration is carried out until the calculated value Fmax of the maximum suspension force conforms to the design precision requirement, finally, the optimized key parameters of the bearingless permanent magnet motor, including the stator inner diameter Dsi and the stator length IFe are obtained. The method has the advantages that the design thought is clear, the design and development time is short, the operation is simple, and the like.

The invention provides an antenatal care platform for a pregnant woman, and solves the problem that a deck chair type can only examine the private part of the pregnant woman and cannot enable the pregnant woman to lie flat for other examinations. The device comprises a base, a hip bed board is installed on the top surface of the base, an upper body bed board is rotationally installed on the top surface of the base, and a leg bed board vertically slides at the right end of the base; guide sliding grooves are formed in the front inner wall and the rear inner wall of the base, a guide rack is installed on one side face of each of the two guide sliding grooves, guide gears are rotationally installed on the front side face and the rear side face of the leg bed board respectively, a linkage rodis coaxially connected between the two guide gears, and a driving worm wheel is coaxially and fixedly installed in the middle of the linkage rod; a leg driving motor is fixedly mounted at the bottom of the leg bed board, and a driving worm meshed with the driving worm gear is coaxially mounted on a rotating shaft of the driving motor. By means of the leg bed board sliding in the base, conversion between the bed and the seat can be achieved, and meanwhile, when the leg bed board slides into the base, the two leg supports can be driven to be lifted upwards.

The invention belongs to the technical field of hole system machining and manufacturing, and particularly relates to an alignment method for turnover boring. According to the method, a through hole ina standard alignment block serves as an alignment object to solve the difference value of an actual rotation center of a machine tool and a theoretical calculation rotation center of the machine tool, namely, a rotation deviation error of the machine tool. The rotation error is used for compensation machining of actual turnover boring machining parts, the design idea is clear and specific, the problem about high-precision functional hole turnover boring coaxiality can be effectively solved, the practicability is good, application and popularization are easy, and the practical value is high.

The invention provides an electromagnetic-field near-field PCB probe, which relates to the measuring probe to measure electromagnetic variables and serves as an electromagnetic-field near-field PCB probe with temperature compensation. The probe is structured by an embedded type strip line, a four-layer PCB, a negative temperature coefficient thermal resistor, a voltage division resistor, a variable capacitance diode, a 2V direct current power supply and an SMA terminal. Through the use of the thermal resistor, the variable capacitance diode and the voltage division resistor to adjust the temperature-capacitance parameters for the strip line structure of the probe, it is possible to overcome the defects of a currently available electromagnetic-field near-field PCB probe that the probe is prone to be influenced by environmental temperature, and that the measuring precision and sensitivity are not stable enough.

The invention relates to a soft reset device for integrated circuit chip and is inserted into the integrated circuit chip. The utility model consists of a ring shape oscillator(11), a reset pulse signal that has certain cycle and meets the reset request under the action of trigger signal according to the software control; a first edge detecting unit(12) that receives the reset pulse signal and outputs reset ending signal, a reset module(13) that receives the reset ending signal and outputs reset signal to start-up reset while outputs reset closing signal to the ring shape oscillator to stop the output of the reset pulse signal. The static power consumption of the module is around zero; the area is small and can prevent the filtering of high frequency input signal caused by the low pass property of the RC; compatible to meet more than one trigger method; clear design concept and can be realized by standard CMOS technique approved by tape-out inspection needless of adding mask.

The invention provides an intelligence material storage device and solves the problems that an ECG machine cannot be moved and carried easily, a portable ECG device often cannot be provided in case ofoutdoor danger encountering, and cardiac function detection cannot be conducted on an endangered person. The portable ECG signal detection device comprises a box, wherein a take-up device is installed in the box in a rotatable manner, the take-up device is wound by multiple detection wires, the multiple detection wires pass through the front end face of the box and are connected to an electrode ball and an electrode clamp in a dismountable manner respectively, multiple electrode ball placement grooves passing through the front end face of the box are formed in the front end face of the box, the multiple electrode balls are put in the multiple electrode ball placement grooves, multiple fixation slide grooves located above the multiple electrode ball placement grooves are formed in the front end face of the box, a fixation slide block slides in each of the multiple fixation slide grooves, fixation springs are installed between the multiple fixation slide blocks and the corresponding fixation slide grooves, and a sterilization device is installed on the inner wall of the front side of the box. The intelligence material storage device has the beneficial effects that ECG detection equipment is installed in the box and can be moved and carried easily, so that detection is provided in time for the outdoor endangered person.

The invention discloses a variable sampling NCS (Networked Control System) controller design method with the packet loss and transition probability being partially unknown, which comprises the steps of dividing a time-varying sampling period into the sum of a constant sampling period and network-induced delay, establishing a system discrete model, and transforming the uncertainty of the sampling period into the uncertainty of system parameters; modeling a networked control system with data packet loss into a Markov jump system with four subsystems, wherein the jump probability is partially unknown, and the data packet loss is described by a Bernoulli sequence; and obtaining a sufficient condition of the stochastic stability of the system by using an analysis method of the Lyapunov stability theorem and the stochastic theory, and solving a linear matrix inequality to obtain a state feedback controller. The method disclosed by the invention considers the unstable sampling period and theunknown packet loss and transition probability of the networked control system, has the characteristics of clear design idea, high stability and sample fabrication and can be applied to the engineering practice.

The invention provides a fixing device for nuclear magnetic resonance examination. The problem that a child patient is possibly injured due to struggling hard caused by fear of psychology after the child patient is fixed on a bed. The fixing device comprises a base, a bed board is arranged on the base in a sliding manner, a head fixing device is arranged at a right end of the bed board, a chest fixing device and hand fixing devices are arranged in the middle of the bed board, leg fixing devices are arranged at the left end of the bed board, and an adjusting device is connected at the lower side of the head fixing device; and the adjusting device can make the head fixing device deviated from the original position when the child patient struggle hard, thereby preventing the child patient from sprain during hard struggling; after the head fixing device deviates from the original position, the adjusting device can make the head fixing device reset immediately, thereby preventing the childpatient from being damaged, and immediately adjusting the head of the patient to the original position. The fixing device provided by the invention is clear in design thought, strong in practicability, not only can fix the limbs and the head of the patient, but also can prevent the child patient from being damaged during struggling.

The invention provides an underground water level detection collector for hydrogeological exploration, and solves the problem that an existing detector cannot collect underground water at the same time when put down. The underground water level detection collector comprises a detection device arranged in a detection hole and a take-up device arranged on the ground, the detection device comprises a detection annular cylinder, a detection sensor is fixedly installed at the bottom of the detection annular cylinder, and a plurality of positioning grooves are formed in the outer surface of the detection annular cylinder; a plurality of positioning rods extending out of the positioning grooves are rotationally installed on the bottom face of the inner cavity of the annular detection cylinder, and a positioning block is fixedly installed at the other end of each positioning rod. The middle part of the annular detection cylinder is coaxially provided with a hollow outer collection cylinder with an opening in the bottom in a vertical sliding manner, the outer collection cylinder is internally coaxially provided with a hollow inner collection cylinder in a vertical sliding manner, the outer surface of the inner collection cylinder is provided with a collection port in a penetrating manner, and the collection port is fixedly provided with a collection filter screen. The underground water level detection and underground water collection work can be completed at the same time, and high practicability is achieved.