44results about How to "Avoid impact detection" patented technology

The invention provides a testing device for polymer material thermal aging and a testing method, and relates to the field of chemical engineering. The testing device comprises a box. A testing cavity and a preheating cavity are disposed in the box. The testing cavity is larger than the preheating cavity. The top of the preheating cavity is communicated with an annular gas delivery pipe. The annular gas delivery pipe winds at the bottom of the testing cavity, and is provided with a plurality of gas inlet holes communicated with the testing cavity. Each of the gas inlet holes is provided with a gas flowmeter. A first thermal insulating layer is adhered at the outer side of the testing cavity. The annular gas delivery pipe is disposed between the testing cavity and the first thermal insulating layer. The testing device is simple and efficient, and single-variable control for the thermal ageing testing device can be achieved, and therefore influences of temperature on thermal ageing can be researched.

The invention relates to the field of flaw detectors, in particular to a wheel set flaw detector capable of adjusting the wheel track of walking mechanisms. The wheel set flaw detector comprises a flaw detection mechanism, an adjusting mechanism, two walking mechanisms, a sweeping mechanism and a driving mechanism, wherein the walking mechanisms are oppositely mounted at two ends of the flaw detection mechanism; the two walking mechanisms are allowed to approach or depart from each other by utilizing the opening and closing principles of ribs; as the two walking mechanisms are contracted, thewhole wheel set flaw detector can be placed in a pipeline to be detected; and the walking mechanisms have a telescopic function, and the two walking mechanisms are loosened after being put into the pipeline to be detected, so the ends of the walking mechanisms abut against the pipeline. According to the invention, the wheel track is rapidly adjusted according to pipelines with different diameters;the whole structure of the wheel set flaw detector is guided, and the situation that the whole structure inclines during walking and the detection of pipelines is affected is avoided; when the wholestructure is placed into a pipeline needing to be detected and then rotates clockwise, expansion of the two walking mechanisms is achieved, so operation is easy; and the expansion of the two walking mechanisms is controlled at the same time, so wheel track adjusting time is saved.

The present invention provides an OFDM (Orthogonal Frequency Division Multiplexing) technology multi-frame synchronization method based on IEEE802.11 protocol, relates to the communication technology, and realizes the identification of the frame header and the frame tail of a baseband signal multiple burst frame of a receiving terminal. The method comprises: employing the baseband signal silent period of a receiver to complete rough synchronization frame header estimation; capturing the minimum frame length after the rough synchronization, and obtaining the fine synchronization frame header estimation according to the short training sequence sliding autocorrelation in the minimum frame length; obtaining the frame tail estimation according to the power mutability according to the silent period of the frame tail symbol prior to the next frame; and capturing the data repeat detection after the frame is end until all the burst frames included in the receiving signals are detected. The orthogonal frequency division multiplexing technology multi-frame synchronization method based on the IEEE802.11 protocol employs the features of the receiving signals themselves to complete the multiple burst frame synchronization of the receiver terminal to reduce the realization difficulty and the algorithm complexity and provide a simple and efficient solution scheme for the frame synchronization of the baseband signal multiple burst frames.

The invention relates to an automatic positioning error correction device used for plastic-shell low-voltage electric appliance integration characteristic detection. The device comprises a clamping mechanism and a detection mechanism which are adjacent to each other. The clamping mechanism comprises a first frame, a support plate horizontally arranged on the first frame and a tooling base plate which can be rotated relative to the support plate. The first frame is provided with one or more hinge flip components which compact and position the rotated tooling base plate. Each hinge flip component comprises a first air cylinder, an air cylinder joint connected to an output terminal of the first air cylinder, a pressing rod whose one end is rotatably connected to the air cylinder joint and a first hinge moving block, wherein one end of the first hinge moving block is rotatably connected to the pressing rod and the other end is rotatably connected to a fixing plate which supports the first air cylinder. The detection mechanism comprises a second frame and a test framework arranged on the second frame. The test framework is provided with one or more groups of probe mechanisms, a CCD mechanism used for capturing a target position and a targeting laser mechanism, wherein the probe mechanisms move along an X axis and an Z axis; the CCD mechanism can move along the X axis, a Y axis and the Z axis; and the targeting laser mechanism can move along the X axis.

The invention relates to the field of real-time fluorescent PCRs (Polymerase Chain Reactions), in particular a universal fluorescent probe and a detection method and an application thereof. The universal fluorescent probe comprises a positive chain probe, a negative chain probe and a specific downstream primer, wherein the positive chain probe comprises an oligonucleotide positive chain sequence, a connection sequence and a specific upstream primer sequence which are connected in sequence from end 5' to end 3'; the negative chain probe comprises an oligonucleotide negative chain sequence which is complementary with the oligonucleotide positive chain sequence, the end 5' and the end 3' of the oligonucleotide negative chain sequence are connected with a fluorescent group and a quenching group respectively; the specific upstream primer sequence and the specific downstream primer are complementary with a target sequence of a target gene. According to the detection method, fluorescent PCR amplification is performed by the universal fluorescent probe; the universal fluorescent probe can be applied to genetic typing and mutation gene detection; by adopting the universal fluorescent probe and the detection method and the application thereof, real-time detection is realized, PCR subsequent treatment is not required, the designing and synthesizing time is saved, cost is lowered, and high result stability and easiness in analysis are realized.

The invention relates to the field of water quality detection instruments, in particular to a liquid chromatograph. The liquid chromatograph comprises a liquid chromatograph body, wherein first magnets are embedded at the periphery of the bottom of the liquid chromatograph body, the liquid chromatograph body is magnetically connected with corrugated pipes through the first magnets, the liquid chromatograph body is elastically connected with a supporting base through the corrugated pipes, the top of the supporting base is in threaded connection with telescopic sleeve rods, and the bottom of the liquid chromatograph body is fixedly connected with buffer pieces. According to the liquid chromatograph, the height of the liquid chromatograph body can be adjusted through the telescopic sleeve rods, so that the liquid chromatograph can be conveniently matched with other equipment or conveniently used by operators, the flexibility is increased, meanwhile, the telescopic sleeve rods can be matched with the buffer pieces during use, the buffer pieces have the shock absorption and damping effects so as to be capable of well alleviating the influence of the ground road condition on the liquid chromatograph body in the transportation process, the normal work of internal components inside the liquid chromatograph body is guaranteed, and the service life of the liquid chromatograph body can be conveniently prolonged.

The invention discloses a safety mechanical fault diagnosis detection device. The safety mechanical fault diagnosis detection device comprises guide wheels, a box body, a heater, an infrared detector,fixed clamps, LED lamps, a camera, temperature sensors and an ultrasonic detector, wherein the guide wheels are arranged on the bottom surface of the box body; the heater is arranged on the inner wall of the box body; the infrared detector and the ultrasonic detector are further arranged on the inner wall of the box body; elastic ropes are arranged at the top end of the box body; the fixed clampsare arranged on the corresponding elastic ropes; a data transmission line is arranged in the box body, and a plurality of groups of temperature sensors are arranged on the data transmission line; a sucker is arranged on the surface of each temperature sensor; a gas filling tank is arranged on the side wall of the box body; a liquid water storage tank is arranged on the box body, and a rotating wheel is arranged in the box body; blades are uniformly arranged on the outer wall of the rotating wheel; a brush is arranged at the outer end head of each blade; and the LED lamps and the camera are arranged on the inner wall of the top end of the box body. By virtue of the device, multiple groups of different data are obtained and compared, the fault of the machine is accurately diagnosed, the influence of external factors to the detection result is reduced, and the accuracy is improved; and meanwhile, the structure is simple, the operation is convenient, and the popularization is facilitated.

The invention discloses an electric energy meter operation error calculation data cleaning system and method based on power utilization characteristics. The electric energy meter operation error calculation data cleaning system comprises a data acquisition unit, a data preprocessing unit, a data analysis unit, a data identification unit and an abnormal data cleaning unit, and can mark acquired abnormal electric energy meter data or power utilization information of a power supply company in an electric energy meter operation error calculation process; the abnormal data is deleted, the abnormal data and the normal data are prevented from being mixed and included in the operation error calculation range of the electric energy meter, the accuracy of operation error calculation of the electric energy meter is ensured, qualified and high-quality data can be provided for error data analysis of the electric energy meter of a user, and an operation error analysis basis is provided for the electric energy meter.

The invention discloses security check, ticket check and epidemic prevention integrated intelligent equipment and a use method, and belongs to the technical field of urban rail transit. The integrated intelligent equipment comprises a gate assembly and a detection assembly. The gate assembly comprises a gate, a side door and two metal detection doors, the gate is located on one side of the two metal detection doors, a vertical rod is arranged at the fixed end of the gate, a temperature measuring camera is arranged on the vertical rod, and the two metal detection doors are connected through a connecting block. The detection assembly comprises a first display screen, a code scanning module and a card swiping module, the first display screen is electrically connected with the temperature measurement camera, the code scanning module and the card swiping module are arranged at the fixed end of the gate machine at intervals, the gate machine is electrically connected with the metal detection door, the code scanning module and the card swiping module, and the side door is electrically connected with the metal detection door, the code scanning module and the card swiping module. According to the security check, ticket check and epidemic prevention integrated intelligent equipment provided by the embodiment of the invention, the requirement of epidemic prevention and control normalization can be met.

The invention provides an FPGA implementation method suitable for pulse compression of a large pulse width signal. The method comprises the following steps of (S1) transmitting a pulse echo signal collected after the down-conversion to a FFT module for FFT processing to obtain a two-channel frequency domain signal; (S2) conjugating and multiplying the obtained two-channel frequency domain signal by samples stored in the ROM in an FPGA chip; (S3) converting the multiplied result to a two-channel time domain signal by IFFT, and combining the two-channel time domain signal into one channel to complete the frequency domain pulse compression. The method reduces the problem of the requirement of hardware resources when the large pulse width signal is compressed, and achieves the pulse compression function of the large pulse width signal in the FPGA. The method has strong flexibility and has a strong practical value and a promotion value.

The invention discloses automatic fluorescence scanning detection equipment and a method thereof. The equipment comprises a lower machine body, a bottom plate is arranged at the bottom of the lower machine body, a left fixing plate is vertically fixed to the left end of the upper end face of the bottom plate, and a right fixing plate is vertically fixed to the right end of the upper end face of the bottom plate; a partition plate is fixed between the middle of the inner side face of the left fixing plate and the middle of the inner side face of the right fixing plate, the upper end of the left fixing plate and the upper end of the right fixing plate are perpendicularly fixed to the left end and the right end of the bottom face of a top plate respectively, a microscopic imaging system is installed in the middle of the top plate, and an automatic focusing system is installed on the rear side of the middle of the microscopic imaging system. An objective lens imaging system is installed on the lower portion of the automatic focusing system, and the lower end of the objective lens imaging system faces a movable block on the movable platform structure. According to the automatic fluorescence scanning detection method, the operation steps of the equipment are introduced in detail, and each step is described more meticulously, so that a user can understand and operate more simply, and the equipment is more convenient to use.

The invention discloses an experiment device for measuring collapsibility of saline soil. The experiment device comprises a sample storage device, a loading device, a water injection device and a measurement device, wherein the sample storage device is used for filling to-be-detected soil and comprises a cylindrical barrel, an opening is formed in an upper end of the cylindrical barrel, at least one group of round holes are formed in a side wall of the cylindrical barrel along an axial direction of the cylindrical barrel, and each group of round holes at least comprises two round holes which are distributed in an outer side of the cylindrical barrel in an array way. By the device, simulation experiment can be performed according to different requirements and different quantity of soil adjustment samples, the experiment phenomenon and progress can be effectively observed by the transparent glass, water can be injected through different round holes, the angles and the quantity of water injection are improved, and on the basis of the reasons, the device can be widely promoted in the field of collapsibility measurement experiment of the saline soil.

The invention relates to a steel box girder bending performance detection device for road and bridge construction. The detection device comprises connecting seats, a rack, a starting switch, a reset switch, a telescopic assembly and a pressure test assembly, the connecting seats are fixedly connected to the two outer sides of the rack, the telescopic assembly is mounted at one inner side in the rack, and the pressure test assembly is mounted between the outer side of the rack and the telescopic assembly. The steel box girder is placed in the rack, the starting switch is pressed, and the starting switch sends out a signal; the control module controls the pressure test assembly to operate for two seconds after receiving the signal and then controls the telescopic assembly to operate, the telescopic assembly operates to drive the pressure test assembly to move downwards to make contact with the steel box girder, and the pressure test assembly is used for carrying out bending detection on the steel box girder, so that the bending of the steel box girder can be detected, and the unqualified steel box girders are avoided.

The invention discloses a system for continuously measuring the permeability of a sintered mixture and a measuring method thereof, which belong to the technical field of metallurgical sintering. The system comprises an ore tank, a distributing device and a sintering machine, a detection unit is arranged at the head of the sintering machine, the detection unit comprises an air blower, a main pipe and branch pipes, one end of the main pipe is communicated with the air blower, the other end of the main pipe is communicated with the two branch pipes, the two branch pipes are arranged along the vertical direction, one end of each branch pipe is inserted into the mixture, and a gas pressure measuring instrument is arranged in each branch pipe. The detection unit is arranged at the head of the sintering machine, the gas pressure measuring instruments installed in the branch pipes of the detection unit are used for measuring the pressure in the corresponding pipelines, the permeability of thedetected mixture is finally obtained, the whole system is simple in structure and convenient to operate, and continuous detection of the permeability of the mixture can be achieved.

The invention discloses a mechanical fault high-efficiency diagnosis and detection device which comprises guide wheels, a box body, a heater, an infrared detector, a fixing clip, an LED lamp, a camera, temperature sensors and an ultrasonic detector. The bottom surface of the box body is provided with the guide wheels, the inner wall of the box body is provided with the heater, the inner wall of the box body is also provided with the infrared detector and the ultrasonic detector. The top end of the box body is provided with an elastic rope which is provided with the fixing clip. The box body isinternally provided with a data transmission line which is provided with multiple sets of temperature sensors, and the surfaces of the temperature sensors are provided with suction cups. The top endof the box body is provided with a medicine adding tube which is provided with a scale. The box body is internally provided with a rotating wheel which is provided with blades, the outer ends of the blades are provided with brushes, and the top end inner wall of the box body is provided with the LED lamp and the camera. Multiple sets of different data are obtained and compared, mechanical failuresare accurately diagnosed, the structure is simple, the operation is convenient, and the promotion is facilitated.

The invention discloses a method for estimating carrier frequency spectrum (CFO). The method includes: according to different frame timings and CP modes, respectively performing autocorrelation estimation and accumulation on non-service downlink signals in received downlink subframes; comparing The modulus of the cumulative result obtained, and the cumulative result with a large modulus is selected for CFO estimation. According to the characteristics of the LTE system, the present invention uses the non-service downlink signal in the downlink subframe to perform CFO estimation, which can solve the problem of CFO estimation performance degradation when there is no downlink service scheduling, and can avoid affecting subsequent SSS detection.

The invention relates to a double-station electrical test device, belonging to the technical field of electrical performance test of a semiconductor device. The double-station electrical test device comprises a workbench, an upper detecting plate and a lower detecting plate, wherein a lower detecting table is movably arranged on the workbench; the workbench is provided with at least three groups of conveying assemblies for conveying PCBs; the multiple groups of conveying assemblies are divided to three parts and are equidistantly disposed on the workbench; and the workbench is further providedwith a limiting piece for limiting the PCB right above the lower detecting table. In use, two to-be-detected PCBs are taken to be placed between guiding rods side by side, when the PCB moves right above the lower detecting plate, the limiting piece limits the PCB, the PCB remains at a required position, a first cylinder then drives the lower detecting table to rise to detect the PCB, and thus, two PCBs can be detected at one time, and the effect of improving the detection efficiency can be achieved.

The invention discloses a method for adsorbing tuberculosis bacilli by macroporous resin, wherein the method comprises the following steps: (1) treating macroporous resin with a pretreatment device, removing dust on the surface of the macroporous resin, and making the surface of macroporous resin clean and dry; (2) adding 10 ml of a bacterial liquid containing tuberculosis bacilli such as urine and hydrothorax into a beaker, then adding the macroporous resin treated in the step (1) to the beaker, fully mixing evenly and carrying out static adsorption for 24 h; and (3) after full adsorption, draining the adsorbed bacterial liquid with a water outlet of the beaker, fully draining the bacterial liquid, then closing the water outlet of the beaker, adding an eluate to the beaker, mixing the macroporous resin with the eluate evenly and fully, draining the eluate, and detecting the content of tuberculosis bacilli in the eluate. A centrifugal precipitation method in the prior art is preventedfrom using, the macroporous resin is used for enriching tuberculosis bacilli in clinical specimens such as hydrothorax and urine, and the accuracy of clinical detection is further improved.