111 results about "Ultrasonic thickness measurement" patented technology

The invention discloses a laminated structure hole manufacturing online monitoring self-adaptive machining method. The laminated structure hole manufacturing online monitoring self-adaptive machining method comprises the following steps that (1), a hole manufacturing cutter installed on a numerical control machine tool is adopted to manufacture holes in laminated structures of carbon fiber reinforced composite materials and alloy materials, the distance between the laminated structure hole forming position reached by the bottom end of the hole manufacturing cutter and the material interface in the laminated structures is measured through an ultrasonic thickness measurement method, and then the distance signal is transmitted to a control system of the numerical control machine tool with the hole manufacturing cutter after being processed; (2), the control system of the numerical control machine tool compares the received distance signal with a set value 0, if the distance value is greater than 0, the control system of the numerical control machine tool still outputs an initial control signal, and if the distance value is 0, the control system of the numerical control machine tool outputs a new preset control signal to change the spindle rotation speed and feeding speed of the hole manufacturing cutter. By the adoption of the method, the laminated assembly hole manufacturing quality and hole machining efficiency can be improved, and the cost is lowered.

The invention relates to an ultrasonic thickness measurement device and method for multilayered wave-absorbing coatings, and belongs to the technical field of ultrasonic non-destructive testing and evaluation. The device comprises a portable digital ultrasonic flaw detector with a bandwidth ranging from 0 to 35 MHz, a delay block probe or an ultrasonic delay line probe partly immersed in water, a coating sound velocity calibrated sample and a computer integrated with a thickness measuring arithmetic. The device is characterized in that the coating thickness is calculated by selecting delta t or fn according to the characteristic of ultrasonic echo wave; and through the iteration windowing analysis by combining the autocorrelation method with the sound pressure reflection coefficient power spectrum method, the coating thickness measuring is realized by selecting an exact fn. The device and the method have the advantages that the limitations that in the conventional ultrasonic thickness measuring technology, the requirements to frequency bands of a flaw detector and the probe are high; the data interception needs manual intervention, and the device is only suitable for single-layer coating, are overcome; the size of the device is small; the weight is light; and the device is suitable for the on-the-spot thickness measuring of various matrixes and outer layers of multilayered coatings, and has major economic benefits and social benefits.

The invention discloses an on-line thickness measurement system for a large aeronautical thin-walled part and a thickness measurement method of the system. The on-line thickness measurement system comprises a positioning sensor and the like, wherein the positioning sensor, an ultrasonic sensor, an ultrasonic thickness measurement data processor and a knife handle constitute an ultrasonic thickness measurement probe; a numerical control system is connected with a five-axis numerical control machine tool; the knife handle is fixed on a spindle of the numerical control system; the positioning sensor is connected with the numerical control system through a first data port; the ultrasonic thickness measurement data processor is connected with the numerical control system through a second data port; the positioning sensor is used for positioning the ultrasonic thickness measurement probe and outputting a control signal to the numerical control system; the ultrasonic sensor is used for transmitting and receiving an ultrasonic signal; the ultrasonic thickness measurement data processor is used for controlling the ultrasonic sensor, controlling the thickness measurement process and processing thickness data; and the knife handle is used for fixing the positioning sensor and the ultrasonic sensor. According to the on-line thickness measurement system for the large aeronautical thin-walled part and the thickness measurement method of the system, the measurement is performed automatically, the accuracy is improved, and labor cost is saved.

The invention discloses a small-curvature radius complex curved surface intelligent ultrasonic thickness measurement system. The system comprises an upper computer, a digital acquisition unit and a display module, wherein the upper computer receives a digital signal of the digital acquisition unit and outputs the received digital signal to the display module for display; a signal input end of thedigital acquisition unit is connected with an ultrasonic transmitting/receiving device; the ultrasonic transmitting/receiving device transmits an ultrasonic signal to a tested object and receives theultrasonic signal returned by the tested object; and the digital acquisition unit converts the ultrasonic signal returned by the tested object into a digital signal and outputs the digital signal to the upper computer. The system realizes automatic calculation processing and digital display of the thickness of the tested object through a control program. In the system, an industrial personal computer (PC) is adopted. The system has a simple structure and high reliability and is low in cost; the measurement accuracy for the measurement of the tested object with the thickness of between 0.5 and4mm reaches 0.01mm; the system has high measurement accuracy and high speed; and the investment in measurement personnel is greatly reduced.

The invention discloses a steel pipe ultrasonic thickness measurement device which comprises a machine frame, a supporting base, a steel pipe tracking assembly and a pipe pressing limiting assembly. The supporting base is installed on the machine frame. The steel pipe tracking assembly is installed on the supporting base, and comprises a tracking device and a detecting device. The tracking device comprises a cylinder, a linear guide rail and a slide block. The detecting device comprises a water tank and an ultrasonic measuring head device. The cylinder and the linear guide rail are both installed on the supporting base. The slide block is installed on the linear guide rail. An output shaft of the cylinder is fixedly connected with the slide block. The slide block is fixedly connected with the water tank so as to drive the water tank to get close to or get away from the pipe pressing limiting assembly. The pipe pressing limiting assembly is installed on the machine frame and used in cooperation with the water tank for clamping and limiting a steel pipe. Through the combination of a steel pipe detection production line actual detection procedure, the water tank is in an initial position when the steel pipe does not enter the detection position, the water tank drives the ultrasonic measuring head device to enter the detection position when the steel pipe enters the detection position, and the high-speed detection during the high-speed movement of the steel pipe can be achieved.

The invention relates to a spherical densely-covered type probe ultrasonic thickness measurement device used for detection in a pressure pipeline. The invention aims at providing the device capable of satisfying a thickness measurement requirement of a large diameter pipeline, especially an elbow. And the device possesses characteristics of good stability during a motion process, high detection precision, high detection efficiency and the like. The spherical densely-covered type probe ultrasonic thickness measurement device used for detection in the pressure pipeline is characterized in that the device comprises a spherical shell, a spherical outer cover, several ultrasonic probes and a signal processing apparatus; the several ultrasonic probes are uniformly distributed on the spherical shell and are connected to the signal processing apparatus in the spherical shell through leads; the spherical outer cover covers an outer wall of the spherical shell and is provided with several through holes which correspond to positions of the ultrasonic probes.

The invention provides a bolt pretightening force measurement method and a verification method for the same. The bolt pretightening force measurement method comprises steps of using an electromagnetic ultrasonic thickness measurement technology to measure a first length of a bolt to be measured and a second length of the bolt to be measured after a nut is screwed and calculating a pretightening force on the bolt to be measured on the basis of a stress strain relation according to the first length and the second length. The bolt pretightening force measurement method does not have to install an additional device on the bolt to be measured, has a simple operation and can fast and accurate measure the pretightening force of the bolt. The invention also provides a verification method for the bolt pretightening force measurement method verifies that the bolt pretightening force measurement method can accurately detect the pretightening force of the bolt and provides a theoretic basis to the bolt pretightening force measurement method.

An apparatus and method for mapping out wall thickness of a tube or other object having motion in two directions. The device includes a first laser for generating ultrasound propagating inside tube wall over a particular generation spot on a surface of the tube, a second laser coupled to an interferometer for detecting produced ultrasonic echoes over a detection spot on the surface. A processor is provided for operating on recorded ultrasonic echoes and using a given value of ultrasonic velocity and the distance between the generation spot and the detection spots for determining wall thickness at a mid-point between the generation and detection spot. An optical displacement measuring device determines a displacement in two dimensions between the generation spot and arbitrary starting spot and a display for displaying wall thickness values over the surface of the tube.

The invention relates to an ultrasonic thickness measurement instrument having a probe protecting and stabilizing function. The ultrasonic thickness measurement instrument includes a host, a connection wire and a detection box. The detection box is therein provided with a lift mechanism and a fixing mechanism. The lift mechanism includes a drive assembly, a telescopic rack, a lift board, an ultrasonic probe, a fixed block, a movable block and a hinge block. The fixing mechanism includes an air exhaust assembly and a movable assembly. The air exhaust assembly includes an air exhaust chamber, aconnection pipe and a pressing plate. The air exhaust chamber is therein provided with a reciprocating unit, a reciprocating rod, a piston and an air exhaust cylinder. The reciprocating unit includesa first motor, a semi wheel gear, a movable frame and two racks. According to the invention, the ultrasonic probe can be retracted into the detection box through the lift mechanism, so that damage ofthe ultrasonic probe due to collision can be avoided. The ultrasonic probe can be fixed together with a to-be-measured object through the fixing mechanism, so that change of a detection position of the ultrasonic probe can be avoided and influence on measurement precision is avoided.

The present invention discloses a pulse excitation type electromagnetic ultrasonic detector, wherein the detector comprises a programmable ASIC device for generating a plurality of signals, wherein the plurality of signals comprise a plurality of emission control signals and a charging control signal; a voltage conversion circuit for converting a low-voltage signal into a high-voltage signal; an emission circuit for generating an excitation signal of high voltage and large current; an electromagnetic ultrasonic sensor for generating an ultrasonic signal according to the excitation signal and transmitting a received ultrasonic echo signal to a received signal conditioning and sampling circuit; the received signal conditioning and sampling circuit for processing and carrying out the analog-digital conversion on the signal received by the electromagnetic ultrasonic sensor, and writing the waveform data points in a storage unit in the programmable ASIC device. The pulse excitation type electromagnetic ultrasonic detector of the present invention solves the technical problem that a conventional electromagnetic ultrasonic thickness measurement instrument can not emit the high-voltage large current on the conditions of small size, low power consumption and the low-voltage battery power supply.

The invention belongs to the field of electromagnetic ultrasonic non-destructive detection and discloses a frequency domain analysis-based electromagnetic ultrasonic thickness measurement method. Themethod includes the following steps that: (a) a test piece with known thickness and a test piece to be subjected to thickness measurement are selected; and (b) the thickness of the test piece to be subjected to thickness measurement is calculated through using a formula. The step (a) further includes the following steps that: (a1) an electromagnetic ultrasonic sensor excitation coil sends signals,and the induced electrical signals of a receiving coil are collected as calibration signals; and (a2) a section of echo signals is intercepted from the calibration signals, and are subjected to re-sampling, full-cycle extension, low-pass filtering, positive half-cycle signal extraction and fast Fourier transformation sequentially, so that a spectrogram is obtained, and a spectrum corresponding topartial frequency bands are selected from the spectrogram, and a frequency corresponding to the peak of the spectrum is obtained. According to the method of the present invention, thickness information is converted from a period which is difficult to read in the time domain to a peak value which is easy to read in the frequency domain, and therefore, with an original circuit not modified, a use lift-off effect can be enhanced, and detection accuracy can be improved.

An on-site detection method of pressure welding positioning defects for a strain clamp is disclosed. The method includes: 1) a step of calibrating an ultrasonic thickness measurement device; and 2) a step of selecting one pressure welding plane of the strain clamp to be detected as a present detection surface, and detecting whether the thickness data of the present detection surface has two times of change equal to the grove depth on a steel anchor in the strain clamp at the longitudinal axis direction by utilization of the ultrasonic thickness measurement device, wherein if yes, the pressure welding positioning of the strain clamp is accurate, and if not, the strain clamp has pressure welding positioning defects. The method has advantages of no need of destroying clamp inner structures, simple, convenient and efficient detection, and suitability for outdoor construction on-site detection of electric transmission lines.

The invention discloses an ultrasonic thickness measurement device. The device comprises a thickness measurement device main body, a measurement probe, an ultrasonic emitter, an ultrasonic receiver and a fixed suction disc. A display screen and an operation button are installed on the thickness measurement device main body. The display screen is arranged on the top of the operation button. A wire connection port is installed in the top of the thickness measurement device main body. A connection line is installed on the wire connection port. The measurement probe is installed on one end of the connection line. According to the invention, through a press rod and the fixed suction disc installed on one side of the measurement probe, it is convenient to fix the measurement probe on a to-be-measured object through the fixed suction disc and the press rod during thickness measurement, and effects on precision of the thickness measurement imposed by displacement of the probe caused by manual factors are avoided during measurement processes of a handheld measurement probe, so measurement precision of the thickness measurement device is improved, hands of a measurement worker are released, it is convenient for the worker to record data, difficulty in using of the thickness measurement device is reduced, heat dissipation performance of the thickness measurement device main body is improved and effect degrees to the thickness measurement precision of the thickness measurement device imposed by temperature rise are reduced.

The invention discloses a device for measuring the thickness of a ship plate. An actuator is installed on a wall-climbing robot, and a pressure sensor and an ultrasonic thickness measurement sensor are installed on the actuator; a control unit is electrically connected with the wall-climbing robot, the pressure sensor, the ultrasonic thickness measurement sensor and the actuator; a coupling agent container is installed on a support, a container pressing head is installed on the upper portion of the coupling agent container, a reset spring is installed between the container pressing head and the coupling agent container, the container pressing head is connected with a smearing head through a hose, one side of the smearing head is connected with a push rod, and the other side of the smearing head is connected with the reset spring; an ejector rod is movably installed in the support, a reset spring is arranged between the ejector rod and the support, and a wedge block, the pressure sensor and the ultrasonic thickness measurement sensor are installed at the lower end of the ejector rod; a cam shaft is connected with a rotary shaft of a stepping motor, and a pressing head cam and an ejector rod cam are installed on the cam shaft in a staggered mode. According to the device for measuring the thickness of the ship plate, thickness measurement points which are distributed more evenly are obtained, thickness measurement efficiency is improved, labor intensity is reduced, the labor cost is reduced, and the working time is shortened.

The invention relates to a method for improving the ultrasonic thickness measurement accuracy by using curve fitting. The method comprises the following steps: according to the characteristics that an ultrasonic signal is similar to a straight line in a short time period above and below a zero point, and when the signal amplitude is higher, the signal is more similar to the straight line, collecting two adjacent sampling points above and below the zero point at the two sides of the positive maximum peak or the negative maximum peak of an echo signal, fitting a straight line through the sampling points, working out corresponding coordinates of a feature point on the fitted curve, sending the coordinates to a thickness calculating module and calculating the thickness of an object to be measured. The method has the advantages that a curve fitting algorithm is used for compensating sampling precision, so that the ultrasonic thickness measurement accuracy is effectively improved under the condition that the sampling clock frequency is constant so as to meet the requirements on the thickness measurement accuracy in certain occasions, the complexity of hardware implementation is reduced, and the reliability of the implementation is improved.

An adaptive sound time calculation method in ultrasonic thickness measurement belongs to the ultrasonic detection technology field, and the present invention especially relates to an adaptive sound time calculation method in ultrasonic thickness measurement. In the method, the sound time calculation is converted to a system identification problem, two adjacent pulse echoes are taken as input signals and desired signals, the improved variable step size adaptive algorithm is used in the iteration process, the proportion, integration and differential of output error power form a step integrated control function to reduce the noise influence and more accurately obtain the pulse response sequence of adjacent echo signals; and the pulse response sequence is subjected to segment fitting and first derivation processing to obtain the maximum value position of the pulse response sequence, and ultrasonic sound time is obtained through conversion of the horizontal ordinate of the maximum value of the pulse response sequence. The adaptive sound time calculation method in ultrasonic thickness measurement effectively reduces the influence of interference noise in the ultrasonic thickness measurement, realizes the stable and high-precision calculation of the sound time and substantially improves the precision of the ultrasonic thickness measurement.

The invention provides a wire and cable intelligent stripping and cutting robot, and belongs to the technical field of wire and cable stripping and cutting equipment. The wire and cable intelligent stripping and cutting robot comprises a clamping mechanism, a cutting mechanism and a connecting rod, wherein the clamping mechanism comprises a chuck and a movable clamping block; the cutting mechanismcomprises a fixing component, a rotating component and a feeding power source; the fixing component comprises a stator disk, a rotating power source and a protective cover; the rotating component comprises a rotating transmission part, a rotor disk, a clamping module arranged on the rotor disk, a cutting module, a painting module, and an ultrasonic thickness measurement module and a distance measuring module; the clamping mechanism is located at one end of the connecting rod; and the cutting mechanism is located at the other end of the connecting rod and can move along the connecting rod. Thewire and cable intelligent stripping and cutting robot recognize, strips and cuts the various layers of a wire and cable through intelligent control and intelligent detection, improves the strippingand cutting precision and the stripping and cutting efficiency, avoids scratches on a wire core, ensures the stripping and cutting quality, is suitable for making various wire and cable connectors, and ensures high accuracy and high reliability of a high-voltage power accessory installation process.

The invention provides an incident drift angle automatic identifying and error compensating method in ultrasonic thickness measurement, wherein the method belongs to the field of ultrasonic detecting technology. Particularly the invention relates to an incident drift angle automatic identifying and error compensating method in ultrasonic thickness measurement. The method comprises the steps of firstly, performing ultrasonic incident drift angle calibration, extracting first echo energy of an ultrasonic signal at different calibration incident drift angles, and establishing an association relation between the calibration incident drift angle and the first echo energy; then, performing sampling for acquiring an actual ultrasonic thickness measurement signal of a measured member, and automatically identifying the incident drift angle by means of the association relation between the calibration incident drift angle and the first echo energy; and finally, calculating a current measuring point echo time difference, finishing incident drift angle association thickness error compensation by means of the established thickness error compensation model, and obtaining an accurate thickness measuring result. The incident drift angle automatic identifying and error compensating method realizes incident drift angle automatic identification in ultrasonic thickness measurement and association thickness error compensation thereof. Furthermore the incident drift angle automatic identifying and error compensating method has advantages of simple algorithm, high reliability and high real-time performance.

The invention discloses a nondestructive detection technology. The technology comprises the following steps: 1, carrying out ultrasonic flaw detection; 2, adjusting the sensitivity; 3, carrying out ultrasonic thickness measurement; and 4, carrying out ultrasonic flaw detection on welds, wherein devices are adopted in the invention. The technology has the advantages of simple operation, low requirements of experiences of operators, and high product quality.

The invention discloses a method for measuring a corrosion rate of a steel structure in a full-service life period. The method comprises the following steps of: (1) performing field nondestructive ultrasonic thickness measurement on at least one part of the steel structure to be evaluated when the steel structure to be evaluated begins to work; (2) selecting at least one steel structure hanging piece of which the material and structure are completely same as those of the steel structure to be evaluated, arranging the steel structure hanging piece on at least one typical part with severe predicated corrosion of the steel structure to be evaluated during an initial service period of the steel structure to be evaluated, performing part labeling on the steel structure hanging piece, performing ultrasonic thickness measurement on any one part of the steel structure hanging piece, performing ultrasonic measurement on an initial thickness value of a tested part, and recording the measured value as D'1'0; (3) measuring and calculating a corrosion rate of the steel structure hanging piece; and (4) measuring and calculating the corrosion rate of the steel structure to be evaluated. The measurement method provided by the invention can be used for accurately evaluating the corrosion state of each part of the steel structure in the full-service life period without damaging the steel structure.

The invention provides a large rotating supporting rolling way abrasion automatic detecting system and a large rotating supporting rolling way abrasion automatic detecting method and belongs to the technical field of detecting. The detecting system comprises a high-accuracy ultrasonic thickness measurement probe, a data collecting card, a controller, a displayer, a relay, an audible and visual alarm, a signal communication module, a driving control module, a data collecting and processing module and an alarm module. In an appointed time interval, the thicknesses of rotating supporting outer rings are measured, and by comparing thickness difference, the abrasion amount of a rotating supporting rolling way in the corresponding time period is obtained. The detecting system can automatically detect the abrasion amount of the large rotating supporting rolling way, when the abrasion amount is larger than an abrasion allowing value, alarming is carried out timely, equipment operation states can be effectively provided, and accident happening rate can be reduced.

The invention belongs to the field of electromagnetic ultrasonic detection, and relates to an internal inspection electromagnetic ultrasonic thickness measurement energy converter structure of a circular pipeline. The energy converter structure comprises a handle, a coil, a protecting cylinder and a magnet; the connecting steel ring is connected to one end of the handle, and the magnet is a hollowcylindrical magnet formed by combining three equal parts in peripheral direction; the magnet is fixed between the connecting steel ring and the fixing steel ring, the protecting cylinder is sleeved at the outer part of the magnet and bonded with the magnet; the annular coil is arranged in the protecting cylinder, and leads of the coil are coiled and aligned on the same direction with equal space,current directions of adjacent leads are the same. The coil forms a vortex at the inner part closing to the surface of the work piece by alternating current; the magnet generates an offset magnetic field; under the effect of the offset magnetic field, the alternating vortex suffers from the alternating lorentz force; under the effect of the lorentz force, the vortex mass point forms mechanical vibration and generates ultrasound wave, thus pipeline thickness can be judged under different conditions.

The invention provides a stay cable surface water film/water line ultrasonic thickness measurement system. A hardware system thereof comprises an industrial control computer, an A/D high-speed data acquisition card, a pulse transmitting and receiving device, a DC voltage stabilizing power supply, an ultrasonic transducer and a fixed device thereof, a reflection surface (being composed of a micro-motor and the 45-degree reflection surface) which can rotate by 45 degrees and the fixed device thereof; and a software system comprises a data acquisition system. The ultrasonic thickness measurement system utilizes the reflection surface which can rotate by 45 degrees and carries out the real-time monitoring of a water film/water line of the stay cable surface on the basis of the ultrasonic reflection principle. The ultrasonic thickness measurement is the nondestructive monitoring, so that the ultrasonic thickness measurement system can not affect the formation and the motion of the stay cable surface water film/water line, but can obtain the real-time thickness, the width, the shape and the vibration properties of the stay cable surface water film/water line, thereby having the advantages of simple structure, safety, reliability, convenient practical application and the like.

The invention discloses a safety comprehensive monitoring and evaluation method for an in-service metal pipeline and a pressure-containing part. An integrated detection method which combines an ultrasonic thickness measurement method, an electrochemical corrosion detection method and a metal magnetic recording detection method is adopted, safety monitoring accuracy for the in-service metal pipeline and the pressure-containing part is improved, safety state comprehensive evaluation for the in-service metal pipeline and the pressure-containing part is realized, and a safety state development trend for the in-service metal pipeline and the pressure-containing part is predicted. Further, a wireless data transmission technology is adopted, remote monitoring on safety states such as corrosion of the in-service metal pipeline and the pressure-containing part, wall thickness and stress concentration are realized, data storage, analysis and management are realized, and the safety evaluation efficiency for the in-service pipeline is greatly improved.