76results about How to "Accurate sampling results" patented technology

The invention relates to a high-fidelity depthkeeping water sample acquisition device. The device comprises a frame body, a lifting device, a sampling cylinder, a cover opening mechanism and a temperature detection device, wherein the frame body is used for being erected at a well mouth of a monitoring well; the lifting device is arranged on the frame body; the sampling cylinder comprises a cylinder body, a sampling bottle and a covering component, the sampling bottle is arranged in the cylinder body, antioxidant gas is filled in the sampling bottle, a water inlet communicating with the inside of the cylinder body is formed in the side wall of the cylinder body, the covering component is arranged in the cylinder body, and the lifting device is in transmission connection with the cylinderbody and used for driving the cylinder body to move up and down; the cover opening mechanism is arranged on the frame body, is in transmission connection with the covering component and is used for driving the covering component to move to open or block the water inlet and the bottle mouth of the sampling bottle; and the temperature detection device is arranged in the cylinder body. The high-fidelity depthkeeping water sample acquisition device has the advantages that structural design is reasonable, the sampling water is not contacted with air in the whole sampling process, the high fidelityof the water sample is ensured, so that the detection result is true and reliable, the temperature is measured in situ, and the measurement error is greatly reduced.

A method and apparatus for road identification in video surveillance is disclosed in embodiments of the present application. The method comprises the steps of creating a symmetrical total convolutionneural network, using a training sample with corresponding annotation data, testing samples and calibrating data to optimize and adjust the parameters, and recognizing the road monitoring picture to be recognized by the symmetrical full convolution neural network after the parameter optimization and adjustment. As a result of applying the technical solution proposed in the embodiments of the present application, end-to-end road detection for each pixel is realized, which can solve the problem that the traditional scene adaptive road segmentation method based on DCNN can not effectively solve the road segmentation problem in the scene of road video surveillance, and improve the accuracy of road recognition in the video surveillance picture.

The invention provides a smoke heating and sampling gun which at least comprises a smoke sampling cylinder and a heater, wherein a smoke sampling nozzle communicated with the smoke sampling cylinder is arranged at the front end of the smoke sampling cylinder; a smoke sampling pipe communicated with the smoke sampling cylinder is arranged at the rear end of the smoke sampling cylinder; a filter cartridge is arranged inside the smoke sampling cylinder; the heater is a spring heating ring in which a thermocouple is arranged; spring heating rings are tightly arranged outside the smoke sampling cylinder and the smoke sampling pipe in a sleeving manner; the spring heating rings are double-tube spring rings; one ends of the two spring rings are connected with each other to form a spring heating ring, and the other ends of the two spring rings are respectively connected with a power line to form positive and negative poles of the spring heating rings; an outer pipe is arranged outside the spring heating rings; a temperature controller and a power plug are arranged on the outer pipe; and the temperature controller is connected in series between the spring heating rings and the power plug. According to the sampling gun, the filter cartridge and the sampling pipe can be simultaneously heated, automatic heating and temperature control are realized, smooth sampling is guaranteed, the sampling result is accurate, and the sampling effect is good.

The invention relates to a high-efficiency sampling device for water quality detection. The technical problem to be solved by the present invention is to provide a high-efficiency sampling device for water quality detection with high sampling efficiency, accurate detection results and simple operation. In order to solve the above technical problems, the present invention provides such a high-efficiency sampling device for water quality testing, which includes a bottom plate, a left side plate, a pulley, a first slide rail, a water tank, a second slide rail, a motor, a winding reel, a first Bearing seat, first rotating shaft, stirring blade, first bevel gear, etc.; left side plate, pulley and first slide rail are arranged on the bottom plate from left to right, and water tank is arranged on the right side of the left side plate from top to bottom , the second slide rail, motor and winding reel. The high-efficiency sampling device for water quality detection provided by the present invention is driven by a motor to make the baffle move left and right, and when the baffle moves to the left, the water in the water tank flows into the test tube.

The invention discloses an on-line sampling method of a reactor; an external circulation system is connected with the reactor; a sampler is connected with an external circulation pipeline; when sampling is needed to be carried out, the external circulation system is firstly started, material in the reactor enters into the special sampler of the external circulation pipeline, then an upper opening valve of the reactor is closed, nitrogen is filled into the special sampler; the material is pressed back into the external circulation pipeline from a bottom hole and then returns to the reactor, the operation is repeatedly carried out for a plurality of times for cleaning and replacing, and the material is finally pressed out by the nitrogen from an outlet of the sampler for sampling; and a valve used for connecting the special sampler and the external circulation pipeline is closed during sampling, so that the material of the reactor is not influenced, and the nitrogen is saved. The on-line sampling method of the reactor is applicable to carrying out on-line sampling on liquid substance in various reactors, and is simple and convenient.

The invention relates to the technical field of water quality monitoring. A shipborne water quality stratified sampling device is provided with a sampling mechanism, the sampling mechanism comprises aplurality of sampling tanks which are fixedly arranged in a circumferential shape, the interior of each sampling tank is divided into a motor control area, a ventilation area and a sealing area through partition plates, and the sampling mechanism is dragged by a cable to descend for sampling and is dragged to the water surface after sampling is completed; the sampling device is further provided with a sample storage mechanism, the sample storage mechanism comprises a horizontal rotating holder and a drainage assembly, a sample storage assembly is annularly arranged in the circumferential direction of the horizontal rotating holder and used for receiving a water sample discharged by the drainage assembly, and the sampling tanks transfer the water sample into the drainage assembly by meansof cable traction. The sampling device is automatically controlled and managed in the whole process, multi-point stratified sampling on a sampling vertical line can be completed through one-time lowering and lifting in a complex flowing water body environment, a sampling result is accurate and is not limited by the water depth, the labor cost is reduced, and the working efficiency of water qualitysampling is improved.

The invention discloses a spraying mist droplet collecting device for an agricultural unmanned aerial vehicle and a use method thereof. The spraying mist droplet collecting device comprises a foundation frame, a fixed base, a rotary rod, a collecting card placing assembly and a motor, wherein the fixed base is located on the foundation frame; the rotary rod is transversely arranged on the fixed base; the collecting card placing assembly is fixedly arranged on the rotary rod and is used for placing a collecting card; the motor is used for driving the rotary rod to rotate; the collecting card placing assembly comprises a rotary disc body, a plurality of collecting card placing grooves, moisture-proof separating doors and a moisture-proof separating door driving mechanism, the collecting cardplacing grooves are arranged at the surface of the rotary disc body along the circumference, each moisture-proof separating door corresponds to each collecting card placing groove and is used for separating the corresponding collecting card and the outside, and the moisture-proof separating door driving mechanism is used for driving the moisture-proof separating doors to be opened or closed. Thespraying mist droplet collecting device has the advantage that after the field operator places the collecting card at one time, the multiple times of sampling tasks can be continuously completed, so that the sampling efficiency is greatly improved, and the labor intensity of the field operator is greatly decreased.

The present invention discloses a mobile water quality monitor comprising a water storage tank, a monitoring probe, a telescopic water suction tube, a peristaltic pump, a water drainage pipe, a gas discharge pipe, a remote control boat and a towing hook, connecting rings are fixedly arranged on left and right sides of the water storage tank, the monitoring probe is arranged inside the water storage tank, the telescopic water suction pipe is in seal connection with the lower part of the water storage tank, the telescopic water suction tube includes a fixed tube and an extension tube, the extension tube is in screw connection with the front end of the fixed tube, the peristaltic pump is in seal connection with the top end of the telescopic water suction tube, the towing hook is in active connection with the rear end of the remote control boat, and the whole water quality monitor is in active connection with the towing hook via the connecting rings at the left and right sides. In the water quality monitoring process, water sampling g flow quantity can be controlled, based on the original adjustment of water area depth, selection of water area width is added, the convenience of sampling is increased, the monitoring probe is not placed in water for a long time, the service life of the equipment is improved, and monitoring data accuracy can be ensured.

The invention relates to a control method of an asymmetric four-section SVPWM (space vector pulse width modulation) technology for a three-phase motor. The three-phase motor comprises a three-phase motor body and six switching devices connected with the three-phase motor body, the six switching devices of the motor with three phases A, B and C have eight switching states 000, 001, 010, 011, 100, 101, 110 and 111 which are represented by eight vector voltages including U1, U2, U3, U4, U5, U6, U7 and U8 respectively, wherein the U1 and the U8 are zero vectors, and the rest U2-U7 are non-zero vectors. The six non-zero vector voltages are divided into vector spaces of six sectors I-VI. The vectors U1, U5 and U7 are used in the sector I, the vectors U1, U7 and U3 are used in the sector II, the vectors U1, U3 and U4 are used in the sector III, the vectors U1, U4 and U2 are used in the sector IV, the vectors U1, U2 and U6 are used in the sector V, and the vectors U1, U6 and U5 are used in the sector VI. The control method has the advantages that switching frequency can be decreased, switching loss is reduced, the maximum modulation ratio can be increased and the like.

The invention relates to a detection device, in particular to a high-reliability sampling detection device for river water in cities and towns and aims to solve existing technical problems and aims to solve technical problems to provide a high-reliability sampling detection device capable of realizing accurate sampling and used for river water in cities and towns. In order to solve the technical problems, the high-reliability sampling detection device for river water in cities and towns is provided and comprises a support, a first support rod, a second support rod, a third support rod, a scale ruler, a first sliding rail, first sliders, a rack, a first fixed pulley, a stopper, a second fixed pulley and the like, wherein a first small hole and a second small hole are formed in the top of the support, the first small hole is located on the left side of the second small hole, a T-shaped baffle is placed at the bottom in the support, and a second sliding rail is arranged on the right wall in the support. The device realizes the effects that river water sampling is accurate and the device is simple in structure, low in manufacturing cost and simple to operate.

The invention relates to an environment-friendly medicament sampling inspection machine comprising a bottom plate, a conveyor, a moving device, a sampling device and a collecting box. The conveyor isinstalled at the middle portion of the bottom plate, the moving device is arranged at the lower end of the conveyor, the sampling device is connected to the front end of the moving device, the collecting box is connected to the rear end of the moving device, the moving device comprises a mounting frame, a driving motor, a driving rotating wheel, a rotating gear, a connecting shaft, a rotary gear,a driven gear, a rack, a fixed sliding groove, a sliding frame and a linear guide rail, and the sampling device includes a first mounting plate, a second mounting plate, a rotating motor, a rotating shaft, a sampling mechanism and a limit frame. The environment-friendly medicament sampling inspection machine can solve the problems that in the existing environment-friendly medicament weight sampling inspection process, manual sampling is needed, the labor cost is high, a machine is prone to being influenced by external influences, and randomness is poor, and the environment-friendly medicamentautomatic sampling function can be realized.

The invention relates to a battery state monitoring system. A battery is connected with a power utilization device. The battery state monitoring system comprises a sampling resistor, a sampling circuit, an analysis unit and a transmission unit, wherein a first end of the sampling resistor is connected with an electrode of the battery, a second end of the sampling resistor is connected with a charge-discharge interface, the sampling circuit is used for sampling a current passing through the sampling resistor and processing the current to obtain sampling data, the analysis unit is used for comparing the current sampling data with historical sampling data and analyzing a load abruptly-changing state of the current power utilization device, and the transmission unit is used for receiving the current load abruptly-changing state and sending the current load abruptly-changing state to a user terminal through a network. In the battery state monitoring system, the sampling circuit is used for sampling a charge or discharge current of the battery electrode in real time and amplifying and processing the current to obtain the sampling data, the analysis unit is used for comparing the sampling data currently sampled with pre-stored sampling data and sending a comparison result to the user terminal so as to inform a user, the battery state monitoring system is short in sampling time and accurate in sampling result, real-time monitoring and notification can be achieved, and high efficiency is achieved.

The invention discloses a gas analyzer used for detecting pungent odor components of rubber asphalt. The gas analyzer comprises a shell, a gas pump, a gas detection chamber and a gas adsorption box are arranged in the shell sequentially through a gas-guide pipe, a bell-shaped gas collector is arranged at the position where a gas pump inlet is communicated with the head of a gas intake pipe, a temperature sensor, a micro camera and distance meter are arranged on the bell-shaped gas collector, multiple gas sensors are arranged in the gas detection chamber, and the gas adsorption box is sequentially provided with a molecular sieve adsorption layer, a chemisorption cotton layer and an activated carbon layer along the flow of gas; a liquid crystal display is arranged on the front panel of the shell, and a fixing mechanism is arranged on the back of the shell. The gas analyzer is simple in structure, convenient in operation, rapid in detection and accurate in result; in the method, signal acquisition is performed by arranging the various gas sensors in the gas detection chamber, rapid analysis is performed through a single-chip microcomputer, the result can be directly displayed on the liquid crystal display visually, and injury to human body is effectively avoided.

The invention provides a probe polarization rotation device, which finishes measurement of horizontal and vertical components of an electromagnetic field through single-polarization probes, and comprises a power unit for providing rotation power; the single-polarization probes, the number of which is at least two, and the initial polarization setting directions of which are same; and drive units for acting the power provided by the power unit onto the single-polarization probes to enable the single-polarization probes to finish polarization synchronous rotation. By changing a conventional single dual-polarization probe into a plurality of single-polarization probes, sampling measurement of one component can be carried out simultaneously at multiple sampling points; through cooperative action of the added power unit and the drive units, all of the single-polarization probes are driven to rotate for 90 degrees simultaneously, and sampling measurement of another component is finished; andmeasurement of two components is finished at one sampling point in one polarization, so that measurement results of two components on the same point have no error, and sampling precision is improved.

The invention relates to the technical field of water quality detection, and discloses water source pollution monitoring equipment, which comprises a box body, a fixing plate, a tap water pipe and a cover top. According to the water source pollution monitoring equipment, the water quality is scientifically measured through a detection instrument; errors and inconvenience caused by manual measurement are reduced; and the reliability of measurement is improved. The water source pollution monitoring equipment collects a water sample on site; after monitoring and analysis, data in the automatic monitoring and analysis main body is transmitted to a central station through the communication network; the water quality environment is timely fed back, the monitoring efficiency of water source pollution is improved; treatment is timely, pollution is avoided, an electronic valve and a water bag are arranged to clean up the inside of the water tank after last sampling, a water pump with a bidirectional function is used to exhaust water out of the water tank, and thus, a next sampling result is more accurate. The water source pollution monitoring equipment is simple in structure, reasonable indesign, high in working efficiency, stable in working performance, high in working continuity and better in performance.

The invention discloses a gastrointestinal flora sampling apparatus which comprises a sampling ball and a shell. The sampling ball is arranged in the shell, the opening in the surface of the samplingball sinks inwards to form a sampling groove, and a sampling port is arranged in the shell; the inner wall of the sampling groove is coated with edible gum; the gastrointestinal flora sampling apparatus further comprises a spring capable of making the shell move relative to the sampling ball. The gastrointestinal sampling apparatus is convenient in use and suitable for timing and locating gastrointestinal tract area for sampling with good compliance and causes little pain to users.

The invention relates to the field of electronic technology, in particular to a motor control single-resistance sampling method, and specifically discloses a pin multiplexing technology using a mediummicro MO chip, and an ADC inner channel technology. One pin (OP_O / ADC_CH2) in the medium micro MO chip corresponds to two ADC channels, and correspondingly, two ADC result registers are provided, andthe results of twice sampling can be respectively registered in two ADC result registers in a sampling process to achieve the stability of the sampling process and to obtain accurate sampling results.

The invention discloses an ecological soil collection device, and relates to the field of ecological devices. When the ecological soil collection device is used, a shovel can be used to dig a pit on the ground of a collected place, the depth of the pit must exceed the diameter of a soil collection cylindrical shell, the soil collection cylindrical shell is horizontally placed in the pit, the two separator plates are parallel to the ground, the soil collection cylindrical shell is laterally inserted into soil by a sharp cutting edge, and the soil collection cylindrical shell is pulled out to complete soil sampling. The soil above the top separator plate is a surface soil sample, the soil below the bottom separator plate is an internal soil sample, and the soil between the two separator plates is soil in a transition area. The soil collection cylindrical shell is covered and sealed with a cylindrical cover, and the soil sample can be taken back to a research site and is researched. The device has the advantages of simplicity in operation, high effect, and accuracy in the sampling result.

The invention discloses a sampling device of polyether polyatomic alcohol in a storage can. The sampling device comprises a sampling can arranged on the lower end of the storage can; the upper end of the sampling can is connected with the lower end of the storage can through a connecting pipeline; a control valve is arranged on the connecting pipeline; the top of the sampling can is provided with an air inlet pipeline connected with nitrogen; an air inlet control valve is arranged on the air inlet pipeline; the bottom of the sampling can is provided with a circulating pipeline; the upper end of the circulating pipeline is connected with the storage can; a sampling port is arranged on the circulating pipeline; a sampling control valve is arranged in the sampling port; and a circulating control valve is arranged on the circulating pipeline. The sampling device has the advantages that the structure is skillful; the use is convenient; the sampling result can completely meet the requirements; no polyether polyatomic alcohol is wasted; and the sampling device is suitable for the sampling of the polyatomic alcohol and the sampling of various liquid matters in the storage can.

The invention discloses a medical radio frequency output power adjusting method and system, and the method comprises the steps: S1, obtaining a radio frequency power signal outputted by a power amplification module; S2, judging whether the power of the output radio frequency power signal is smaller than a preset threshold value or not, and if not, adjusting the power of the radio frequency power signal through a power switch control signal adjusting method; if yes, adjusting the power of the radio frequency power signal through a voltage adjusting method; and S3, inputting the radio frequency power signal corresponding to the adjusted power into a power amplifier for processing, and outputting the processed radio frequency power signal by the power amplifier. According to the invention, quick response under high power and good output waveform (closer to sine wave) during low-power output are maintained. When the output waveform is close to a sine wave, high-frequency components are few, and an accurate sampling result can be obtained by using relatively low sampling frequency.

The invention provides a thermal power plant flue gas sampling system which comprises a sampling pipe, an air pipe, a probe outer sleeve and a flue gas mixing tank. The sampling pipe comprises the multiple sampling branch pipes arranged below the ammonia gas injection grid at intervals, multi-point sampling can be achieved, the first branch pipe of the air pipe is communicated with the flue gas mixing tank, negative pressure can be formed in the flue gas mixing tank, the smoke sample in the sampling pipe is sucked into the flue gas mixing tank to be mixed, the mixing space is large, the heating pipe panel is arranged on the main air pipe of the air pipe to heat compressed air, the flue gas mixing tank is arranged in the flue, condensate water can be prevented from being generated when the smoke sample is mixed, the sampling and mixing effect is good, and the sampling result is accurate. The probe outer sleeve penetrates through the flue wall and is inserted into the flue gas mixing tank, the second branch pipe is communicated with the probe outer sleeve, compressed air can be sprayed out from the probe outer sleeve, the flue gas mixing tank and the sampling pipe into the flue through the second branch pipe, the sampling pipe is convenient to dredge and clean, the structure is simple, and operation is convenient.

The embodiment of the invention provides a sampling circuit module. The module comprises a first sampling module, a second sampling module and a third sampling module, the first sampling module is used for collecting an alternating current signal output by a tested device to obtain a first voltage signal; the second sampling module is used for collecting a direct current signal output by the tested equipment to obtain a second voltage signal; and the third sampling module is used for acquiring an alternating current or direct current voltage signal output by the tested equipment to obtain a third voltage signal. The first sampling module comprises a current mutual inductance unit and an amplification unit, and the current mutual inductance unit corresponds to different coil turns through different first switches. According to the sampling circuit module provided by the embodiment of the invention, the current signal and the voltage signal can be sampled, and meanwhile, the closed first switch can be determined according to the alternating current signal, so that the number of turns of the coil of the current mutual inductance unit is determined, and a more accurate alternating current sampling result is obtained.

The invention discloses a protective sampling swab for large animals in the technical field of medical instruments. The protective sampling swab comprises an outer shell, an inner shell and a samplingswab. The outer shell is a transparent hollow cylindrical tube, a sampling end is folded towards the central axis to form a hemisphere, and a star-shaped one-way valve opening structure is arranged;the inner shell is a transparent hollow cylindrical tube, the middle part of the inner shell is sleeved in the outer shell, the tail section is provided with a funnel-shaped buckle. Before the swab isin use, the sampling end of the inner shell is sleeved in the outer shell. The sampling swab comprises a swab rod, a swab head and a push-pull rod, and the middle part of the swab rod is sleeved in the inner shell; the swab head is fixed at the front end of the swab rod, and the retraction state and the extension state are switched under the push-pull action of the push-pull rod; with a double-layer protective shell structure, sterile sampling is practically realized, the sampling result is more accurate; and, the problem of artificial uterine effusion cannot be solved.

The invention relates to environment-friendly drug weight sampling inspection equipment. The environment-friendly drug weight sampling inspection equipment comprises a bottom board, a conveyor, a moving device, a sampling device and a weight detecting device; the conveyor is installed in the middle of the bottom board; the moving device is arranged at the lower end of the conveyor; the front end of the moving device is connected with the sampling device; the rear end of the moving device is connected with the weight detecting device; and the weight detecting device comprises a supporting board, a bearing board, a spring, a standard block, a baffle and a collection tank. The environment-friendly drug weight sampling inspection equipment can solve the problems that in the existing environment-friendly drug weight sampling inspection process, manual sampling is needed, the labor cost is high, the process is easily affected by external factors, randomness is poor, and people needs to collect unqualified drugs; the automatic sampling and collecting functions for environment-friendly drugs can be achieved; and the environment-friendly drug weight sampling inspection equipment has the advantages that manual sampling is not needed, the labor cost is low, the influence factors are few, the randomness is good and the unqualified drugs can be automatically collected.

The invention discloses a mineral powder sampler and relates to air detection equipment. The mineral powder sampler comprises a main machine, a pre-capturer, a straight tube, an L-shaped tube and a secondary motor, wherein an air pump is arranged inside the main machine and is moveably connected with the straight tube; the secondary motor is fixed on the main machine; a first gear is connected with the output end of the secondary motor; the straight tube is sleeved by a second gear; the first gear is meshed with the second gear; one end of the L-shaped tube is connected with the straight tube; the other end of the L-shaped tube is connected with the pre-capturer; the straight tube is driven to rotate by the secondary motor through the first gear and the second gear; the rotating shaft at the output end of the secondary motor is parallel to a water level; the rotating shaft of the straight tube is parallel to the rotating shaft of the output end of the secondary motor; the L-shaped tube connected with the straight tube rotates with the straight tube as a rotating shaft under the driving of the straight tube; and a relatively large range of air can be collected by the pre-capturer connected to the other end of the L-shaped tube.

The invention aims to overcome the defects in the prior art, provides a PIE coding demodulation method with ultra-low power consumption and a circuit architecture, greatly reduces the overall power consumption of a circuit on the premise that the performance is not reduced, adjusts the sampling reference, and ensures the sampling accuracy. In order to achieve the purpose, the PIE coding demodulation method with ultra-low power consumption is realized based on a demodulation coding circuit, the demodulation coding circuit comprises a counter formed by connecting N stages of registers in series,and a system clock only drives a first stage of register; Each level of register is driven by the output negation of the previous level of register; Therefore, the driving clock of the Nth-level register becomes SYS _ CLK / 2 ^ (N-1). By the adoption of the technical scheme, when the number of bits of the counter is larger than two, the total power consumption of the counter is remarkably lower than that of a counter of a common structure. Therefore, the overall energy consumption of the circuit is reduced after the power is reduced, and the later optimization of the overall structure is facilitated.

The invention discloses a solidification-type flatness sampling device for constructional engineering, and relates to the technical field of solidification-type flatness sampling devices for constructional engineering. The device comprises a dark case, and the central part of the interior of the dark case is provided with a horizontal shading hard blocking plate. The shading hard blocking plate enables the dark case to be divided into an upper liquid storage box and a lower solidification box. The liquid storage box is connected with the solidification box through a pipe equipped with a switching ball valve. The center of the top surface of the liquid storage box is provided with a push injector which is communicated with a cavity of the liquid storage box. A side wall of the solidification box is uniformly provided with ultraviolet lamps, and the lower end of the solidification box is in sealed connection with a sampling rubber film. The liquid storage box contains liquid photosensitive resin. The interior of the solidification box is vacuum. The device is simple in structure, is convenient to use, is low in manufacture cost, is portable, and is complete and accurate in flatness sampling.

The invention discloses a denitration system flue gas multi-point sampling system, which comprises sampling probe rod units, a pipeline switching device and a sampling dilution device, the sampling probe rod units are arranged in a flue at intervals and are connected to the pipeline switching device through sampling pipes, the pipeline switching device is connected with the sampling dilution device, and the sampling and diluting device is connected with the gas analyzer. According to the invention, the pipeline switching device is arranged to realize switching of multi-point or single-point sampling of flue gas, so that the requirements of flue gas sampling under different conditions are met, multiple sampling modes are provided, and the adaptability is high; the pipeline switching device and the sampling feeler lever unit are linked through the control device, so that automatic switching of sampling modes is realized; and the pipeline switching device is used for switching pipelines, so that the sampling system has the advantages of good sealing performance, accurate sampling result, low failure rate and lower cost.