137results about How to "The measured value is accurate" patented technology

The invention discloses a straight cut testing system for rock and earth mechanics, relating to a cutting system. The invention is composed of outer frame, horizontal loading system, vertical loading system, cut box, and measuring system; the horizontal loading system, the vertical loading system, the cut box and the cut box are fixed on the outer frame, respectively; the horizontal loading system, the vertical loading system and the measuring system are connected with the cut box, respectively. The invention has high measuring accuracy and good stability; all the data are automatically collected, thus reducing artificial reading error; it adopts variable frequency electric motor so as to reduce the manufacturing cost on the premise of assuring a stable cutting speed; all the parts are removable, convenient to transport and install. It can be used in determining peak values and remaining shearing strength of fine earth, coarse earth and soft rock and provide strength parameter for engineering design and rock and earth stability.

The invention relates to a device and a method for simulating generation of a gas hydrate and measuring physical property parameters thereof. The device is characterized by comprising a high-pressure reactor which is respectively connected with a high-pressure gas distribution system, a temperature measuring system, a pressure measuring system and an ultrasonic sound velocity measuring system, wherein the high-pressure reactor is arranged in a cold bath tank connected with a refrigeration compressor; a handle slide rod is slidingly inserted at the top of the high-pressure reactor; the ultrasonic sound velocity measuring system comprises two ultrasound probes respectively arranged at the bottom of the handle slide rod and the bottom in the high-pressure reactor, and the two ultrasound probes are respectively connected with an acoustoelectric transducer; one acoustoelectric transducer is connected with the transmitting end of an ultrasonic signal transmitter-receiver through a lead, while the other acoustoelectric transducer is connected with the receiving end of the ultrasonic signal transmitter-receiver through a lead; the ultrasonic signal transmitter-receiver is connected with an oscilloscope, and the output end of the oscilloscope is connected with a computer acquisition system; and a gas hydrate sound wave acquisition and analysis module is preset in the computer acquisition system.

The invention provides a chip type oxygen sensor and a preparation method thereof. A porous protection layer of the chip type oxygen sensor comprises a transition layer, a porous layer and a compact layer; holes are formed on all the layers, so that the bottom of the porous protection layer is communicated with the top of the porous protection layer; the transition layer contains zirconium oxide and magnesia alumina spinels, the average hole diameter of the transition layer ranges from 0.1 mu.m to 2.5 mu.m, and the porosity of the transition layer ranges from 20 percent to 40 percent; the porous layer contains zirconium oxide, magnesia alumina spinels and noble metal, the average hole diameter of the porous layer ranges from 0.1 mu.m to 3.5 mu.m, and the porosity of the porous layer ranges from 30 percent to 50 percent; and the compact layer contains zirconium oxide, the average hole diameter of the compact layer ranges from 2 mu.m to 3 mu.m, and the porosity of the compact layer ranges from 20 percent to 40 percent. Compared with the prior art, the chip type oxygen sensor has the advantages of high sensitivity and thermal shock resistance and long service life.

The invention discloses a horizontal laser measurement system and a method for an airplane. The horizontal laser measurement system is composed of a laser locating device, a horizontal reference coordinate point and a horizontal measurement point. The horizontal laser measurement system is characterized in that: at least four horizontal reference coordinate points are arranged around the airplane; the laser locating device is arranged at one side of the airplane; a plurality of horizontal measuring points are arranged on the airplane; and the laser locating device is connected with a computer. In a measuring process, the value of each measuring point is produced by a laser tracker according to the laser reflection principle, so that the measurement error caused by manual operation is reduced, and the measurement value is more accurate.

The invention relates to the field of detection, in particular to the field of steel slag detection and more particularly relates to a method for detecting the total iron content of steel slag. Aim at the problems of inaccurate detection to the content of total iron in steel slag and high detection cost at present, the invention innovatively provides the method for detecting the total iron content of the steel slag. The method comprises three main procedures of sample preparation by breaking, decomposition and element content measurement. Through the adoption of the method, the total iron content of the steel slag can be economically, quickly, effectively and accurately measured.

The invention provides a chip type oxygen sensor and a preparation method thereof. A porous protection layer of the chip type oxygen sensor comprises a transition layer, a porous layer and an absorption layer; holes are formed on all the layers, so that the bottom of the porous protection layer is communicated with the top of the porous protection layer; the holes on the transition layer with thediameters ranging from 0.1mu.m to 1.5 mu.m account for above 80 percent of the total holes on the transition layer; the holes on the porous layer with the diameters ranging from 0.3 mu.m to 8 mu.m account for above 80 percent of the total holes on the porous layer; the holes on the absorption layer with the diameters ranging from 0.1 mu.m to 2 mu.m account for above 80 percent of the total holes on the absorption layer; the transition layer contains zirconium oxide with stable yttrium oxide and magnesia-alumina spinels; the porous layer contains zirconium oxide, magnesia-alumina spinels and noble metal; and the absorption layer contains magnesium oxide, calcium oxide, aluminum oxide, magnesium sulfate and barium oxide. Compared with the prior art, the chip type oxygen sensor has the advantages of high sensitivity and thermal shock resistance and long service life.

The invention discloses a low-temperature ultrasonic vibration fatigue experiment system. The low-temperature ultrasonic vibration fatigue experiment system comprises a piezoelectric transducer and an ultrasonic signal generator. The electric energy input end of the piezoelectric transducer is electrically connected with the alternating current signal output end of the ultrasonic signal generator, and the mechanical vibration output end of the piezoelectric transducer is connected with a test piece. A cryogenic box is further included and is of a closed box body structure, the test piece is located in the cryogenic box, a cooler is further arranged in the cryogenic box, a cooling device is further arranged outside the cryogenic box, and the cooling device is connected with the cooler through a pipeline. The cooler is of a spiral-coil-shaped structure, and the reciprocating direction of the test piece is located on the axis of the spiral-coil-shaped structure. A convection fan arranged in the cryogenic box is further included, and the axis of the convection fan is collinear with the axis of the spiral-coil-shaped structure. According to the system, a low-temperature vibration fatigue loading experiment can be efficiently conducted on the test piece.

The invention discloses a device for testing antifouling property of a hollow-fibre membrane. The device comprises an end cap, and a hollow hole arranged in the end cap, wherein a charging pump and a feed liquid circulating barrel for forming a circulation loop are connected with two ends of the hollow hole; a plurality of connecting pipes are arranged at the two ends of the hollow hole, and between the charging pump and the feed liquid circulating barrel; a pressure gauge is arranged on each connecting pipe, and valves are also arranged at two ends of the hollow hole on the end cap. By adopting the device for testing the antifouling property of the hollow-fibre membrane, the fibre membrane to be tested is arranged inside the hollow hole in a testing process, and liquid inside the feed liquid circulating barrel is driven to flow circularly through the charging pump; a work scene of the fibre membrane in actual operation can be simulated by controlling the entire internal pressure of the device, and the antifouling property is test. Therefore, the device is simple in operational process, convenient and fast in measurement process, and accurate in measured numerical value. Thus, the device disclosed by the invention is applied to the field of an experiment test.

The invention relates to a determination method for potential well deep distribution of methane adsorption by coal, which relates to a method for evaluating methane reserves in a coal reservoir, due to characteristic of uneven potential well depth of methane adsorption by raw coal body, multi-measuring point adsorption measurements under adsorption pressure and different constant temperature conditions can be carried out on a block coal sample; by using a Langmuir equation based on adsorption kinetics, the adsorption rate parameter b under different constant temperature conditions and the corresponding temperature T enable fitting calculation to obtain a proportion constant bm, the methane adsorption quantity under each constant temperature condition and adsorption pressure are subjected to segment fitting, quantity of different depths of potential wells can be calculated, and a potential well distribution histogram in a certain depth scope can be drafted. The method can be used for realizing accurate calculation of methane adsorption capability under different temperature and pressure conditions on the coal body, and can be used for accurately evaluating the coal bed gas content of the coal reservoir.

The invention relates to a rapid microwave moisture measurement method for a fluid extract and an extract. The method comprises the following steps: 1, taking two pieces of glass fiber papers, putting the glass fiber papers on a balance of a microwave moisture measurement apparatus and weighing in a peeling manner, taking an extract sample and putting the extract sample on one piece of glass fiber paper, covering with the other piece of glass fiber paper and flattening, then putting the papers back to the balance, covering with a detection pool, beginning to detect and recording a measurement value; 2, substituting the measurement value of the microwave moisture measurement apparatus into a data model, and calculating the moisture value according to the formula that the moisture value of the extract is equal to X * the measurement value of the microwave moisture measurement apparatus + Y, wherein X and Y are relationship parameters of moisture measurement by microwaves and moisture measurement by a drying method.

The invention discloses an online video magnification workpiece detector. A rapid positioning mandrel is connected above the main frame of the instrument, and a camera mounting body is installed below the main frame of the instrument, and a CCD industrial sensor with a magnification lens is installed inside. Camera, the display screen of the CCD industrial camera is installed in front of the main frame of the instrument, and the quick positioning mandrel above the main frame of the instrument is set coaxially and concentrically with the magnification lens of the CCD industrial camera installed in the camera installation body. The present invention is directly installed on the fast positioning fixture of the spindle of the numerical control and digital display processing machine tool, and the measured workpiece on the workbench is directly photographed with the lens of the CCD industrial camera, and the video image is enlarged and transmitted to the display screen, and is set in the center of the display screen. Some cross marks are used to position the detection reference of the workpiece to be tested, and then the moving table drives the invention to move to each detection position of the workpiece to be tested, and the cross marks are used for comparison and measurement, and the accurate information is obtained from the digital display table of the processing machine tool. measured value.

The invention discloses an integral time constant calibration method which is characterized by comprising following steps: (1) a pulse signal with an amplitude of U is given to an input end of an integrator, and the integrator integrates the pulse signal to obtain an integral output curve; (2) according to the formula, after a time T, an integral output voltage is that V=(U/RC)T+U, wherein R is an integrator resistance, C is an integrator capacitance, T is an integral time, and U is an integrator initial voltage, thereby the integral slope K can be calculated by the integral output curve; (3) the slope of the integral output curve is that K=(V to U)/T=(U/RC), thereby an integral time constant is that t=RC=U/K, wherein U is the amplitude of the pulse signal, K is the slope of the integral output curve, U and K can be calculated by the formula, and the integral time constant t can be calculated by substituting U and K. The method of the invention has simple operation and clear steps, the according formulas are all known physical formulas, and no special devices are needed in the method of the invention. And the method of the invention has rapid measurement process and accurate measured value, and is convenient for technicist to use.

The invention discloses a device and a method for measuring the diameter of a dense pipe bundle and the thickness of an oxide film on site. The device comprises a plurality of rod diameter measurement units and a plurality of oxide film thickness measurement unit which are mounted on a measurement rack, wherein the rod diameter measurement units are all arranged in the same horizontal plane; the oxide film thickness measurement units are all arranged in the same horizontal plane; a channel, through which a sample supply pipe passes, is arranged inside each of each rod diameter measurement unit and each oxide film thickness measurement unit; the channel of each rod diameter measurement unit is correspondingly coaxial with the channel of each oxide film thickness measurement unit. By classification of the dense pipe bundle, the device can directly and precisely measure the diameter of the dense pipe bundle and the thickness of the oxide film at any position in the whole stroke on the site; in the measurement process, direct contact with a human body is avoided; a sensor is configured to measure tiny changes of the diameter and the thickness of the oxide film, so that the detection is safer, more efficient and more reliable; in case of failure of a certain measurement unit, the device still can complete the measurement work.

The invention relates to a mounting clearance measuring device of a reactor coolant pump thrust plate. An upper pressure plate (3) is mounted on a tool shaft (4); a bolt (1) is assembled with a threaded hole formed below the tool shaft (4) through a lower pressure plate (2); and a thrust plate (7.2) is installed between the upper pressure plate (3) and the lower pressure plate (2). An axial clearance plate (5) is installed above the tool shaft (4) by hexagon head screws (6). A lifting lug is installed in the threaded hole above the tool shaft (4). A dial indicator is mounted on the plane of the axial clearance plate (5). Therefore, the clearance between the thrust plate and the main thrust tile can be measured quickly and accurately. The time spent in the whole process is reduced; the controllability is high; the manpower is reduced; the operation becomes simple; and the device is convenient to mount or dismount. The device is manufactured conveniently; and the cost is saved.

The invention provides a human body cold stress fine grading evaluation system in a low-temperature operation environment. The system comprises the following steps of selecting metabolic rate values which accord with actual labor intensity and labor types of human bodies from an established metabolic rate database; selecting dynamic thermal resistance and moisture resistance values of clothes according with the actual environment from the established dynamic thermal and moisture resistance database of clothes and substituting the values into the system; calculating time-varying core temperature, local skin temperature and average skin temperature of human bodies in the low-temperature cold environment through the established human body cold stress partition fine prediction model. Comparedwith index thresholds of different cold stress stages, cold stress level of human bodies is evaluated. Therefore, acceptable longest exposure time for human bodies is determined, measured value is more accurate, predictability is good, guidance is provided for selecting appropriate emergency equipment according to the cold environment and reasonably arranging organization and production strategiesin the cold environment. Theoretical basis and guidance are provided for reduction of occupational injuries in China, personnel cold stress risk is reduced, and personnel life safety is protected.

The invention discloses a device for detecting pseudo soldering of a power battery module and a detection method thereof, and belongs to the technical field of battery module quality detection. A plurality of battery cells are connected in series, and a plurality of detection units are arranged, so that the resistances at the welding parts of the battery cells and connecting assemblies can be measured simultaneously, and the device is particularly suitable for measurement by methods such as a four-end method. Meanwhile, the plurality of battery cells are connected in series through the plurality of connecting assemblies and adapt to the use working conditions, and compared with a measurement mode only for the welding position of one battery cell and one connecting assembly, the method hasthe advantages of stable current and voltage during measurement and more accurate measurement numerical value.

The invention relates to a PICC catheter length measuring method, and belongs to the clinical technical field of PICC. The method comprises the following steps that (1) a patient lies low lays the upper limbs out in parallel to form 90-degree angle with the side body, and the length A from the upper limb marking to the right sternoclavicular joint is measured; (2) after puncture, the length C between the upper limb marking and the PICC puncture point is measured to obtain the PICC catheter length = A+B-C, wherein B is the deviation distance. The method is simple and easy to operate. After puncture, the position of the PICC puncture point is determined, then the length between the upper limb marking to the length of the puncture point is measured, and the positioning is accurate. The upperlimb marking is the obvious feature position of the upper limb of the patient body, the positioning is accurate regardless of single or multiple measurement, no marking setting is required, and marking blur does not occur. Measured values are more accurate, and the measured values are more precise by means of calculation of the deviation distance B, so that the catheter tip position is more accurate.

A torsional spring type measuring pendulum for low-and-medium-frequency shock spectrum comprises a base, a torsional spring sleeve, a swing link, a shifting fork A, a mass block, a torsional spring, a supporting rod, a shifting fork B and two sliding pins. The two sliding pins include a sliding pin A and a sliding pin B. In terms of structure, the torsional pendulum structure of the torsional spring type measuring pendulum for shock spectrum has the advantages of reducing device mass and size and making the device portable as compared with the low-frequency vibrator structure for measuring low-frequency shock spectrum; as compared with a reed instrument, the torsional spring type measuring pendulum has the advantages that its hinge structure at the fixed end can prevent the swing link structure from plastic deformation so as to improve service life of the whole measuring device. In terms of function, the torsional spring type measuring pendulum for the shock spectrum can be used for measuring low-and-medium frequency shock spectrum directly and can substitute for the way of measuring the low-and-medium frequency shock spectrum by combination of the reed instrument and the low-frequency vibrator. In terms of measuring way, the torsional spring type measuring pendulum is of a cam structure of the swing link, which converts rotational measurement into linear displacement measurement; thus, compact structure and high measuring precision are achieved.