47results about How to "Even detection" patented technology

The invention discloses a geological survey soil sampling device capable of laterally sampling, and relates to the technical field of soil sampling. Comprising a sampling drill cylinder part, and a negative pressure back suction part is installed on the sampling drill cylinder part and used for sucking a soil sample in the sampling drill cylinder part; an acid-base detection piece is mounted on the sampling drill barrel part; a traction control piece is mounted on the sampling drill cylinder part and is connected to the acid-base detection piece; the traction control part is used for pulling the acid-base detection part to switch a detection sample; a detection solution preparation part is mounted in the sampling drill barrel part; negative pressure suction work can be carried out by adopting the suction sleeve, and the structure can be prevented from water leakage when sampling is carried out on collapsed or marsh soil under the action of negative pressure; the problems that in the background technology, an existing soil sampling device is inconvenient to separate and sample a soil sample in the center of a sampler and is also inconvenient to carry out negative pressure permeation prevention are solved.

The invention discloses a wafer defect detection method and system based on an attention guidance network, and belongs to the technical field of wafer defect detection, and the method comprises the following steps: 1, adjusting light supplement according to a detection demand, and then collecting a wafer image; 2, performing spectrum enhancement preprocessing on the acquired wafer image; and 3, extracting the features of the enhanced image through a multi-scale distributed feature extraction backbone network, and fusing the extracted features through an attention-guided feature pyramid network. Complex background interference of the wafer is effectively suppressed, and defect characteristics are remarkably enhanced; constructing a feature extraction mechanism capable of capturing local details and long-range context information at the same time; balanced and accurate detection of multi-scale defects is realized; the physical priori of the defect is embedded into the network in a learnable manner, so that the learning efficiency and generalization are improved; while ultrahigh precision is ensured, low model complexity is maintained, and the real-time requirement of a production line is met.

The invention relates to the technical field of power transmission line detection, in particular to a power transmission line hardware fitting damage intelligent detection method based on an unmanned aerial vehicle. Comprising the steps that a main unmanned aerial vehicle takes off, an auxiliary unmanned aerial vehicle is assisted to take off, a to-be-detected hardware fitting is accurately determined through cooperation of the main unmanned aerial vehicle and the auxiliary unmanned aerial vehicle, and the main unmanned aerial vehicle and the auxiliary unmanned aerial vehicle conduct X-ray picture collection and detection on the hardware fitting; the unmanned aerial vehicle airborne detection platform is constructed, double unmanned aerial vehicles work cooperatively, clear X-ray images can be obtained quickly, the detection efficiency is far higher than that of traditional manual detection, and the power failure time is greatly shortened; according to the improved network structure, SPPF-DLKA and C2fG-Ghost modules and a CA attention mechanism are applied, the feature adaptation and extraction capability is enhanced, strong light interference is inhibited, and the damage type, degree and position of the hardware fitting are accurately judged; potential problems can be found in time, line faults are avoided, maintenance cost is reduced, and safety and reliability of power transmission lines are improved.

The invention relates to the technical field of anti-collision devices of thread scanner probes, and discloses an anti-collision device of a thread scanner probe, which comprises a scanning rotating shaft, and a protection cavity is formed in the scanning rotating shaft. According to the anti-collision device, the shearing force borne by the connecting part is larger than the adsorption force between a first powerful magnet block and a second powerful magnet block, at the moment, a first sliding round block drives a side head anti-collision sliding base to slide towards the end, close to a wire passing hole, of a protection cavity, and relative displacement is generated between a side head anti-collision fixing base and the side head anti-collision sliding base; when the computer detects that the input of the corresponding IO port is disconnected, the control software executes a collision exception handling program, at the moment, all control motor movement operations on the software are prohibited, a collision prompt window pops up, and the scanning rotating shaft stops driving the measuring head on the measuring rod to rotate; thus, secondary impact caused by continuous rotation of the measuring head is avoided, and the measuring head is protected from being further damaged.

The invention discloses a road quality automatic detection method and system based on object recognition, and the system comprises an image collection module which comprises a plurality of devices and is capable of adjusting parameters and collecting road images; the data transmission module is stable in transmission and supports wired and wireless modes; the image preprocessing module is used for denoising, enhancing contrast and correcting distortion; the object recognition module is used for recognizing a road problem by using a CNN model; the quality evaluation module is used for evaluating according to standards and formulas; the storage and display module is used for storing data and displaying results, and all the modules cooperate to guarantee detection. The road quality can be efficiently and accurately detected, manual errors are reduced, images can be rapidly collected and processed, various road diseases can be recognized, the quality can be automatically evaluated, data storage and display are convenient, safe and stable data transmission can be guaranteed, and road maintenance and management intelligentization is facilitated.

The invention discloses a recycled concrete test piece water seepage and adsorption detection system, and relates to the technical field of recycled concrete water seepage and adsorption detection, the recycled concrete test piece water seepage and adsorption detection system comprises a detection box, a dust box, a water tank and a rainwater simulation mechanism, and the top end of the detection box is provided with the dust box and the water tank. According to the invention, automatic clamping and positioning of objects can be realized through the positioning mechanism, and automatic clamping and positioning of objects with different sizes can be realized by the positioning frame through adjustability of the top plate, so that water seepage and adsorption detection can be carried out on recycled concrete test pieces with different sizes; therefore, the water seepage and adsorption performance of the recycled concrete test piece and the performance of the recycled concrete test piece in different sizes can be evaluated more accurately, a sufficient basis can be provided for engineering design and construction, the recycled concrete test piece can be taken out more conveniently and quickly without being pried out manually by using a tool due to the fact that the placing piece is convenient to disassemble and assemble, and the working efficiency is improved. The time is saved, and the efficiency is improved.

This invention discloses an online inspection device and method for the light conversion film of photovoltaic modules. The online inspection device includes a conveyor roller, an inspection cover, multiple top excitation light source units, multiple top signal acquisition units, multiple edge excitation light source units, multiple edge signal acquisition units, and a processing unit. The conveyor roller is used to transport photovoltaic modules along a first horizontal direction; the inspection cover has an openable and closable inlet / outlet on its side wall along the first horizontal direction; the top excitation light source units and top signal acquisition units are both located on the top inner wall of the inspection cover and are used to project a first wavelength of light onto the photovoltaic modules inside the inspection cover; the edge excitation light source units and edge signal acquisition units are both located on the inner side wall of the inspection cover along a second horizontal direction and are used to collect the second wavelength of light projected by the photovoltaic modules inside the inspection cover. This online inspection device achieves accurate inspection of non-transparent photovoltaic modules without blind spots, breaking through the dependence of traditional through-type inspection on transparent photovoltaic modules.

The invention belongs to the technical field of dimming greenhouse films, and discloses a strength detection device for dimming greenhouse film production, the strength detection device comprises an adjusting mechanism, the adjusting mechanism comprises an air cylinder, and the interior of the air cylinder is slidably connected with a telescopic rod; through cooperation of the inclined grooves, the sliding rods and other structures, arc shapes formed at the tops of the first supporting frame and the second supporting frame can be adjusted conveniently, the greenhouse roofs of different shapes and specifications can be simulated through the device, the strength of the dimming greenhouse film on the different greenhouse roofs is detected, and the detection accuracy of the dimming greenhouse film on the greenhouse roofs is improved. According to the method, the strength performance of the dimming greenhouse film in various practical application scenes can be comprehensively detected, and due to the fact that greenhouse roofs of different shapes and specifications have different influences on stress distribution of the dimming greenhouse film, the comprehensive simulation detection can cover various stress conditions possibly encountered by the dimming greenhouse film, so that the strength performance of the dimming greenhouse film can be accurately evaluated, and the application prospect is wide. Accurate data support is provided for application of the dimming greenhouse film in different types of greenhouse roofs.

The high-temperature deformation detection device comprises a box body, an inner cavity of the box body is provided with a partition wall, the partition wall divides the inner space of the box body into a heating cavity and a detection chamber, and the side wall of the heating cavity is provided with a water inlet and a water outlet. The heating cavity is located on the periphery of the detection chamber, and a heating wire is installed in the heating cavity. A supporting seat is arranged in the center of the bottom of the partition, and a concave groove matched with the pipe is formed in the top of the supporting seat. The utility model relates to the technical field of pipe performance testing, in particular to a high-temperature deformation detection device for a pipe, which separates heating liquid from the pipe by arranging a partition and enables the pipe to be in a closed and stable high-temperature environment by utilizing the high temperature of the heating liquid, so that the pipe can be smoothly detected, and the detection efficiency is improved. Meanwhile, the pipe is prevented from being in direct contact with the heating liquid, and unnecessary troubles are omitted.

The invention discloses a dynamic balancing machine of a vertical double-face wind wheel, and particularly relates to the technical field of dynamic balancing machines, the dynamic balancing machine mainly comprises a platform, a frame plate and a transmission screw, the frame plate is fixed at the top end of the platform, the transmission screw is located on the inner wall of the frame plate and is rotatably connected with the frame plate, and a displacement detection mechanism is installed on one side of the frame plate; the displacement detection mechanism comprises a driving motor mounted on one side of the frame plate, and the driving motor is used for driving the transmission screw to rotate; the displacement detection mechanism further comprises a sleeve block, a first pressure sensor, a second pressure sensor, a sliding column, a transverse distance sensor and a vertical distance sensor. The displacement detection mechanism is adopted, a transmission screw carries a sleeve block to move rightwards under the action of threads, a vertical distance sensor can sense the position of the circular ring face of the bottom end of the vertical double-face wind wheel, the position of the outer wall of a shaft of the vertical double-face wind wheel and the position of the circular ring face of the bottom end of the vertical double-face wind wheel can be detected, and double-point-position uniform detection can be achieved; and the dynamic balance detection is more accurate.

This utility model relates to the field of airtightness testing of radiators, and discloses a water-based airtightness testing device for radiators, including a testing base, a vertical connecting assembly for sealing the radiator outlet and injecting water into the radiator inlet, and a horizontal connecting assembly for sealing the side holes of the radiator. The vertical connecting assembly includes a lifting seat that can move vertically and a vertical driving component for driving the lifting seat to move. The lower surface of the lifting seat is provided with a first vertical rubber block and a second vertical rubber block, and the upper surface of the lifting seat is provided with a water injection hole. The end of the second vertical rubber block is provided with a connecting hole that communicates with the water injection hole. The horizontal connecting assembly includes a horizontal rubber block and a horizontal driving component for driving the horizontal rubber block to move horizontally. When the first vertical rubber block is located above the radiator outlet, the second vertical rubber block is located above the radiator inlet, and the horizontal rubber block is directly opposite the side holes of the radiator.

The invention relates to a carbamate pesticide residue rapid detection non-woven fabric and a preparation method thereof, the carbamate pesticide residue rapid detection non-woven fabric comprises an outer package, the outer package is internally provided with an enzyme-containing cloth, a water-soluble film, an indigo-containing cloth, a color-developing cloth, a flash-evaporation non-woven fabric and a warm paste, and the enzyme-containing cloth, the water-soluble film, the indigo-containing cloth, the color-developing cloth, the flash-evaporation non-woven fabric and the warm paste are stacked and connected from top to bottom. The preparation method comprises the following steps: dipping pure cotton spunlaced non-woven fabric in a cholinesterase gelatin solution, taking out and airing to obtain enzyme-containing fabric, dipping the pure cotton spunlaced non-woven fabric in an indophenol acetate solution, taking out and airing to obtain indigo-containing fabric, and drying to obtain the indigo-containing fabric. The enzyme-containing cloth, the water-soluble film, the indigo-containing cloth, the color-developing cloth, the flash-evaporation-method non-woven cloth and the warm paste are mutually connected and put into an outer package, and finally the interior of the outer package is vacuumized to obtain the quick-test non-woven cloth. The method is simple and convenient to operate, high in detection speed and high in detection result accuracy.

The utility model relates to the technical field of sock detection, and discloses rubbing color fastness detection equipment for socks, which comprises a bottom plate and two second frames, a first frame is fixedly connected to the middle of the top of the bottom plate, and a first motor is fixedly connected to the top of the first frame; the output end of the first motor is fixedly connected with a first two-way threaded rod, the outer ring of the first two-way threaded rod is in threaded connection with a first threaded block, the front end of the first threaded block is fixedly connected with a moving frame, and the inner wall of the moving frame penetrates through and is rotationally connected with a second two-way threaded rod. According to the sock detection device, through cooperation of the first frame, the first motor, the first bidirectional threaded rod, the first threaded block, the movable frame, the second bidirectional threaded rod, the clamping plate, the rubber sealing gasket, the exhaust fan, the collection box, the hose, the pipeline and the dust suction opening, the sock fixing stability is greatly improved, falling in the detection process is prevented, it is ensured that detection is conducted smoothly, and the efficient and stable fixing mode is adopted.

The utility model relates to the technical field of detection kits, and discloses a detection kit for detecting the content of lobetyolin in traditional Chinese medicinal materials. The upper surface of the outer frame supporting frame is connected with a detachable elisa plate coated with lobetyolin antigen or a detachable elisa plate coated with goat-anti-mouse secondary antibody, one side of the outer frame supporting frame is provided with a placing frame, and the side edge of the placing frame is connected with the inner side of the detection reagent inner box; an enzyme marker placing tube, an anti-lobetyolin monoclonal antibody diluent placing tube, a developing solution placing tube, a stop solution placing tube, a sample diluent placing tube, six lobetyolin standard solution placing tubes with different concentrations and washing concentrated solution placing tubes are arranged on the placing rack. According to the detection kit for detecting the content of lobetyolin in the traditional Chinese medicinal materials, manual shaking is reduced, meanwhile, a plurality of sample test tubes can be placed in the test tube placing box at the same time, and the shaking efficiency is improved.

The utility model discloses a piston ring detection device capable of automatically loading and unloading. The device comprises a workbench, and a loading unit, a detection unit and a sorting and unloading unit which are sequentially arranged on the workbench along the horizontal direction, wherein the detection unit comprises a first mounting frame, a hinge rod, a semicircular ring gauge frame, a driving mechanism and a detection mechanism. The piston ring press-in detection device overcomes the defects that the press-in detection mode that the piston ring is pressed into the ring gauge through downward movement of the punch is not ideal in effect, and if the piston ring is normally in an open state, if the piston ring needs to be directly pressed into the ring gauge, the opening of the ring gauge is certainly wider than the diameter of the piston ring in the open state; and the other opening is matched with the diameter of the piston ring in a closed state, so that in actual use, the piston ring possibly inclines in the ring gauge, thereby causing inaccurate detection and even material blockage. According to the piston ring detection device capable of automatically feeding and discharging, the piston ring cannot incline in the detection mechanism.

The application relates to the technical field of wind farm insulation performance detection, in particular to a wind farm power collection line insulation performance detection device, which comprises a sleeve rod, one end of the sleeve rod is provided with an extension rod, the extension rod is provided with a universal adjusting mechanism at the end away from the sleeve rod, the universal adjusting mechanism comprises a motor two, a U-shaped plate, a rotating block one, a rotating block two, a motor three and a rotating groove. The wind farm power collection line insulation performance detection device is designed in cooperation with the universal adjusting mechanism and the auxiliary supporting assembly, so that the angle of the detection head can be automatically adjusted according to the size of the space of the detection part in the wind farm power collection line during use, the detection process of the insulation performance on the wind farm power collection line is more smooth, the detection efficiency is higher, and the detection mechanism can be assisted and supported by the auxiliary supporting assembly during the long-time detection process, so that the labor intensity of the workers during the detection process is effectively reduced.

The utility model discloses an oil quality on -line monitoring devices for track locomotive is applied to, including oil inlet pipe, integrated sensing module and oil outlet pipe, the oil inlet pipe one end with the oil inlet of heat exchanger intercommunication, the other end with integrated sensing module one end intercommunication, integrated sensing module's other end with oil outlet pipe one end intercommunication, oil outlet pipe's other end with the oil outlet of heat exchanger intercommunication, by oil inlet pipe, integrated sensing module and oil outlet pipe form the passage with main pipeline of heat exchanger parallel connection. The utility model discloses through integrated sensing module can realize the comprehensive, accurate monitoring to oil product key index, can also avoid causing the blockage to main oil way simultaneously, guarantee the smooth progress of detection, simultaneously, the utility model discloses need not to the structure of existing track locomotive to complete installation just can improve greatly, has saved the installation cost, and satisfies the monitoring demand under the complex operation condition of track locomotive.

This application relates to a foreign object detection device and a foreign object inspection method. The foreign object detection device includes a substrate loading device and a light receiving device. The substrate loading device includes a frame, a drive mechanism, and a clamping mechanism. The clamping mechanism includes a drive member and two clamping arms. One clamping arm abuts against one end of the substrate, and the other clamping arm abuts against the other end of the substrate. The drive member drives the two clamping arms to move closer or further apart. When the two clamping arms move closer together, they clamp the substrate. The drive mechanism is mounted on the frame and is drivenly connected to the clamping mechanism. The drive mechanism drives the clamping mechanism to move the substrate to a target position. The light receiving device receives light from the substrate at the target position for substrate detection. A gap is provided between the light receiving device and the substrate at the target position. When the light receiving device detects the substrate, the gap conforms to a preset range. Through the coordinated operation of the substrate loading device and the light receiving device, high-precision clamping and stable and accurate optical detection of the substrate are achieved.

The application belongs to the technical field of analytical testing, and relates to a CoZrTaB alloy digestion method suitable for ICP-OES analysis, comprising the following steps: (1) mixing CoZrTaB alloy with compounded acid, wherein the compounded acid is compounded by nitric acid solution and hydrofluoric acid solution; (2) performing heating treatment on the mixture obtained in step (1) until a clear solution is obtained; (3) placing the clear solution obtained in step (2) for cooling, and diluting and constant volume to obtain a to-be-tested solution suitable for ICP-OES analysis. The digestion method provided by the application realizes the technical targets of efficient dissolution, precise adaptation and stable reliability by taking into account the chemical characteristics of different metals in the CoZrTaB alloy and the sample preparation requirements of ICP-OES analysis, and is compatible with multi-element synergistic dissolution and multi-form adaptation, and the process parameters are controllable, which is conducive to large-scale popularization and application.

The invention relates to the technical field of cutter detection, and discloses a cutter visual automatic detection device and an operation method thereof, specifically, the cutter visual automatic detection device comprises a detection equipment main body and a visual detection assembly installed on the detection equipment main body, and a positioning assembly is installed on the surface of the detection equipment main body. The positioning assembly comprises a positioning support fixedly connected to the surface of the detection equipment body, and a sliding plate is slidably connected to the interior of the positioning support. According to the invention, after the positioning assembly is installed, the tool is clamped from the bottom and the upper half section of the tool is detected, the tool can be rapidly clamped and rotated from the top end of the tool through the ingenious clamping and rotating design, intermediate links in the detection process are reduced, the detection process is smoother, and the detection efficiency is improved. The detection device can comprehensively scan each detail of the cutter, and the defect that the surface of the cutter cannot be comprehensively detected after the cutter is clamped by traditional detection equipment is overcome.

The utility model discloses a heating device for a nuclear magnetic tube sample injector of a nuclear magnetic resonance spectrometer, which can be used for heating and preserving heat of a nuclear magnetic tube. The nuclear magnetic tube sample injector heating device of the nuclear magnetic resonance spectrometer comprises a heating device arranged in a sample injection device on the nuclear magnetic resonance spectrometer, the sampling device comprises a machine body; the machine body is provided with a turntable mounting cavity; a driving device mounting cavity is arranged below the turntable mounting cavity; the turntable mounting cavity and the driving device mounting cavity are separated by a partition plate; a first turntable and a second turntable are sequentially arranged in the turntable mounting cavity from top to bottom; the heating device comprises an annular heating piece arranged on the partition plate. Air holes are formed in the second turntable; heat conducting rods which are uniformly distributed along the circumference are arranged on the second turntable; the lower end of the heat conduction rod penetrates through the second rotating disc and extends to the position above the partition plate. By adopting the device, the liquid nuclear magnetic sample in the nuclear magnetic tube can be always kept in a liquid state, and smooth detection is ensured.

The utility model provides a new thermos bottle that can improve lithology density logging instrument Pe value measurement precision, include: barrel body include: the coaxial sleeve of outer tube is located in instrument shell; The coaxial sleeve of inner tube is located in outer tube, and there is gap between the outer wall of inner tube and outer tube, and the inner tube is used for setting detector; The first end of the first closed structure is closed barrel body; The second closed structure is connected with outside vacuumizing device, and the gap is vacuumized; Wherein, hollow structure is set up on the barrel body, and beryllium layer is installed in the hollow structure; Beryllium window is set up on instrument shell, and beryllium layer is opposite to detector and beryllium window respectively. So as to open hollow structure and install beryllium layer at the corresponding detector and beryllium window of instrument shell of barrel body, not only can the heat of superhigh temperature be isolated by vacuum gap and closed structure, and the detector is protected, but also can the low energy gamma ray absorption be reduced by beryllium layer, and the ray is detected smoothly, so as to improve Pe value measurement precision.

The utility model relates to the field of concrete detection device, especially a kind of concrete strength detection device.It includes detection platform, lifting seat, detection component, seal cover one and seal cover two.The middle part of detection platform is provided with rotatable support, and both sides are provided with sample limiting frame;Lifting seat is located at the top of support, and outside is provided with half-enclosed seal cover one.Detection component is located at the bottom of lifting seat, and includes detection piece one and detection piece two;Seal cover two is half-enclosed in the side of sample limiting frame, and dust collecting piece is provided on seal cover two.The present application switches different stations by lifting seat rotation, so that the detection process is coherent and alternating, improves the efficiency of detection, through detection piece one and detection piece two cooperation, large detection range, detection position is flexible, can satisfy different detection needs.Seal cover one and seal cover two are connected to form the seal cover body structure that surrounds sample limiting frame and lifting seat, solve the pollution and security risk problem when detecting.

The utility model relates to the technical field of concrete structural member detection, and discloses a concrete structure surface crack detection device which comprises fixing rings, one end of each fixing ring is hinged with the same fixing ring through a hinge, a buckle is arranged between the two fixing rings, and a plurality of crack detection assemblies are arranged on the two fixing rings. According to the concrete structure surface crack detection device, cracks on the surface of a concrete column can be detected through a plurality of crack detection assemblies, so that even the vertically placed concrete column can be uniformly detected; according to the concrete structure surface crack detection device, the time-consuming and labor-consuming situation that in a traditional mode, an operator needs to use a detector to align a detected column to continuously move to detect a concrete column is avoided, and the detection efficiency of the concrete column is improved to a certain extent; the whole detection area is quickly and accurately covered, and the detection time is greatly shortened.

The utility model discloses a defect detection tool for a semiconductor cavity assembly, and relates to the technical field of semiconductor device defect detection devices. The defect detection tool for the semiconductor cavity assembly comprises a tool base, a defect detection device is arranged at the top of the tool base, the defect detection device comprises a detection adjusting unit and a limiting unit, the detection adjusting unit comprises a circular adjusting seat, an adjusting sliding rail is arranged in the circular adjusting seat, and the limiting unit is arranged in the adjusting sliding rail. Four sets of embedding blocks are arranged in the adjusting sliding rail in an array mode, and inserting grooves are formed in the embedding blocks. According to the utility model, the driving rod in the detection adjusting unit rotates to drive the connection frame to rotate, the rotation drives the insertion block to circumferentially slide in the adjusting slide rail in the circular adjusting seat, the insertion rod impacts the adjusting slide rail, and the insertion block drives the detection assembly arranged thereon to carry out multi-angle detection in the rotation process. And the arrangement of a plurality of groups of detection assemblies can ensure the comprehensiveness of the cavity assembly during detection.

The invention discloses a viscosity detection device and method for aminosilicone oil emulsion production, belonging to the technical field of aminosilicone oil emulsion detection, comprising a main body module and an automatic detection module, wherein the main body module comprises a conveying frame, the top of the conveying frame is fixedly connected with a test frame, both sides of the test frame are provided with longitudinal grooves, the automatic detection module comprises a lifting slide plate slidably connected between the inner walls of the two longitudinal grooves, a lifting component is arranged between the two sides of the inner wall of the test frame, the lifting component is connected to the top of the lifting slide plate, both sides of the test frame are provided with track components, and through the arrangement of the lifting component, the viscosity test device body, the track component, the transmission component and the conveying component, the device can realize continuous detection of multiple aminosilicone oil emulsions, so that the overall detection process is smoother, it is convenient to detect more aminosilicone oil emulsions, and the detection efficiency is further improved.

The utility model discloses a detection device for a fixed gas detector, and relates to the technical field of gas detection. Comprising an adjusting part, a fixing plate, a detection shell and a gas conveying part, the adjusting part is arranged on the mounting frame, and the fixing plate is arranged on the adjusting part. According to the detection device for the fixed gas detector, a real gas environment can be simulated through the detection mechanism, detection gases with different concentrations can be conveyed into the detection shell, and the performance of the fixed gas detector can be comprehensively verified, including whether the fixed gas detector can work normally or not and the sensitivity of the fixed gas detector to the gases with different concentrations can be detected; the gas detector can accurately and reliably monitor the gas concentration in actual use, and potential safety hazards can be found in time.

The utility model discloses a heat exchanger shell, a heat exchanger and a heat exchange unit, the heat exchanger shell is arranged to be in an unclosed ring shape, the heat exchanger shell is provided with a first end face and a second end face which are suitable for a heat exchanger flow path to penetrate through, the first end face is an end face close to a gas collecting pipe, and the second end face is an end face close to a gas collecting pipe. The second end surface is far away from the gas collecting pipe; the first end face comprises at least two step faces, a step is formed between every two step faces, and the first end face is arranged to be in a step shape with the height gradually decreased from the inner side to the outer side so that a penetrating space can be provided for a detection probe. According to the utility model, the first end face is arranged to be in the step shape with the height gradually reduced from the inner side to the outer side, so that the movable space of the detection probe is increased, and the detection of the pipeline on the inner side of the end face of the heat exchanger shell can be conveniently realized.