17results about How to "Simple measurement process" patented technology

The invention discloses a numerical control machine tool spatial position calculation method based on BP neural network correction. The method comprises the following steps: establishing a spatial error geometrical relationship model; planning a measurement track and measurement points, presetting theoretical position coordinate data of each measurement point, and obtaining actual measurement position data; geometric error parameters are obtained based on actual measurement position data and substituted into the space error geometric relation model, and a machine tool space error model is obtained; obtaining error calculation coordinate data in combination with the theoretical position coordinate data and a machine tool space error model; the theoretical / actual measurement / error calculation position coordinate data are used for BP neural network training, and a neural network correction model is obtained; and correcting the position coordinate data of the machine tool space points by using the neural network correction model to obtain corresponding actual position coordinate data. According to the method, a technical path of decoupling an error source through geometric modeling, fitting nonlinear features through a BP neural network and optimizing a model through data driving is adopted, and a solution with theoretical preciseness and engineering practicability is provided for high-precision machining of the machine tool.

This utility model discloses a tool for detecting the verticality of on-site wall and column formwork, relating to the field of building construction. The technical solution includes an F-shaped measuring rod, which consists of a vertical section, a top horizontal bar fixedly mounted at the top of the measuring rod, and a middle horizontal bar fixedly mounted in the middle of the measuring rod. A plumb bob is tied to one end of the top horizontal bar near the measuring rod, and an inverted triangular positioning plate is integrally connected to the other end. A scale plate is fixedly mounted at the lower end of the vertical section of the measuring rod. The scale plate is arc-shaped, with its center coaxial with the mounting axis of the plumb bob, and scale lines are provided on the scale plate. The beneficial effects of this utility model are: simplifying the data measurement process at the top of the formwork, improving data accuracy, avoiding personnel climbing the scaffold, and reducing safety risks.

The utility model discloses a magnetic levitation line power rail measuring scale, which comprises a measuring frame and a plurality of measuring parts, the measuring frame comprises an upper positioning piece and a lower mounting piece, the upper positioning piece is internally provided with a positioning groove, the positioning groove is used for nesting, fitting and abutting against a magnetic levitation rail functional piece, and the lower mounting piece is provided with a plurality of positioning holes. One end of the lower mounting part is connected to the bottom of the upper positioning part, the other end of the lower mounting part horizontally extends in the direction close to the power rail, the other end of the lower mounting part is provided with a measuring groove, the measuring groove is used for nesting the power rail, the multiple measuring parts are connected to the lower mounting part, and the measuring parts are connected to the lower mounting part. And the plurality of measuring parts extend into the measuring groove and are used for measuring the power rail. The power rail can be rapidly and accurately measured, the measurement process is simplified, the measurement efficiency is improved, the maintenance cost is reduced, it is ensured that the installation position of the power rail meets the design requirement, and safe and stable operation of a maglev train is guaranteed. Meanwhile, the method has a wide application prospect.

The utility model relates to a kind of for the placement tool of auxiliary instrument measurement board chamfer surface, belong to the technical field of measuring equipment, including tool base, tool base is equipped with the first bearing surface and second bearing surface of inclination setting, first bearing surface and second bearing surface present certain angle, first bearing surface is equipped with first protection plate, and second bearing surface is equipped with second protection plate;Board is placed in tool base, and board large surface is in abutment with first protection plate, and board side is in abutment with second protection plate, and board chamfer surface is perpendicular to the lens axis of measuring instrument. By inclination setting and the first bearing surface and the second bearing surface of angle and corresponding protection plate, form stable support structure, ensure that board does not displace or shake in the process of measurement, and the chamfer surface of auxiliary support after the board to be detected is perpendicular to the lens axis of measuring instrument alignment, to greatly improve measurement accuracy and efficiency.

The application discloses a device for dynamically monitoring hole collapse of pressure relief drilling in a coal mine, which comprises a fixing mechanism and a measuring mechanism, the fixing mechanism comprises a fixing rod, and the fixing rod is inserted into the pressure relief drilling; the measuring mechanism comprises a power supply, wires, color-changing light-emitting diodes and annular spring rheostats, the annular spring rheostats are used for converting the pressure applied from the outside into changes in resistance values of the annular spring rheostats, a plurality of annular spring rheostats are arranged on the fixing rod at intervals, and each annular spring rheostat serves as a measuring point; each annular spring rheostat is connected with a color-changing light-emitting diode through the wires and the power supply to form a series loop, and the color-changing light-emitting diode changes color according to the current in the series loop; and the annular spring rheostats between the measuring points are connected in parallel. The device can dynamically and real-timely monitor the hole collapse in the hole, is not affected by the hole collapse of the drilling itself, has simple design principle, high operability and low cost.

The application discloses a kind of non-contact high-temperature superconducting tape critical current uniformity continuous nondestructive testing device and method, applied to superconducting material detection field, comprising: excitation magnet, for producing background magnetic field, excitation high-temperature superconducting tape generates magnetization current;Measuring probe, by magnetic circuit core, fluxgate sensor, copper band compensation loop is formed;Fluxgate sensor and copper band compensation loop are connected with control and measurement circuit respectively by fluxgate power supply acquisition line and copper band compensation loop power supply line;Control and measurement circuit, for when fluxgate sensor detects that net residual magnetic flux in magnetic circuit core is not 0, PID control is implemented by closed loop negative feedback, in copper band compensation loop, the magnetic flux that is equal to high-temperature superconducting tape, opposite, and according to current in copper band compensation loop when net residual magnetic flux is 0, calculate critical current.The application realizes the fast, accurate measurement of high-temperature superconducting tape critical current uniformity without depending on Hall sensor and without calibration inverse calculation.

The application discloses a kind of optimization methods of residual magnetism measurement process in magnetic resonance imaging system, adopt positive and negative combination gradient as test gradient, the difference of the action of spin echo and gradient echo is combined with magnetic field inhomogeneity, the change of magnetic field uniformity caused by test gradient is measured, then the change of echo peak caused by the change is used to measure the strength of residual magnetism.The method avoids the reference test under the condition that test gradient is zero, overcomes the adverse effects of magnetic hysteresis on reference signal, ensures that the magnetic field distribution state when collecting echo signal in measurement process is determined and stable, eliminates the influence of test sequence on test result, so as to improve the accuracy and stability of residual magnetism measurement result.The method of the application is simple and easy to operate, can measure the spatial anisotropy of residual magnetism, can be used to evaluate the influence of residual magnetism on imaging space positioning, and is especially suitable for judging whether permanent magnetic resonance imaging system meets the requirements of space positioning for monitoring and navigation in interventional therapy.

This invention provides a positioning support for downhole control measurement, comprising a positioning base plate, a positioning stake at the top center of the positioning base plate, and several stabilizing columns at the bottom. A positioning reflector is sleeved on the top of the positioning stake, and an illumination lamp is provided parallel to the side of the positioning reflector. Several screw posts are provided on both the top and bottom of the positioning base plate, and the screw posts on the top of the positioning base plate are all equipped with studs. The illumination lamp is sleeved on any one of the studs. The stabilizing columns are connected to the positioning base plate through the screw posts. This invention simplifies the measurement process, reduces the workload of measurement personnel, reduces the impact of wind on measurement work, enables rapid location of target points in dim environments, improves work efficiency, and has strong practicality.

The utility model relates to the technical field of damper inner tube, and disclose a kind of measuring device for damper inner tube production, including base, the top of base is fixedly connected with mounting bracket, and the outer wall of mounting bracket is provided with control display.The measuring device for damper inner tube production is provided with through-hole, pull rod, measuring plate, displacement sensor, mounting cylinder, sliding slot, spring, sliding block and long rod, and the operator makes measuring plate move up by single hand pulling pull rod, and the other hand places damper inner tube on base, then loosens pull rod, and measuring plate can be quickly moved down and adhere to inner tube surface under the spring reset effect, and the outer diameter data is accurately obtained by displacement sensor, the device greatly simplifies measurement process, significantly improves measurement efficiency, is especially suitable for the rapid detection in damper inner tube batch production scene, effectively solves the problem of long time consumption and low efficiency of prior art, so that operator can quickly obtain accurate outer diameter data.

The present application belongs to the technical field of oil and gas equipment detection, and particularly relates to a wellbore casing cavity three-dimensional measurement method based on omni-directional speckle structured light. The wellbore casing cavity three-dimensional measurement method based on omni-directional speckle structured light is simple to operate, high in measurement accuracy, capable of realizing accurate reproduction of the actual appearance of the wellbore casing cavity, simplifying the existing cavity measurement process, and suitable for appearance detection of wellbore casings and complex cavities. The wellbore casing cavity three-dimensional measurement method based on omni-directional speckle structured light comprises the following steps: constructing a cavity imaging model based on monocular speckle structured light; determining a calibration workpiece; three-dimensionally calibrating the cavity imaging model based on monocular speckle structured light; preparing a speckle image; collecting an omni-directional speckle image in the cavity; expanding the collected omni-directional speckle image; calculating the final parallax of each pixel to complete three-dimensional point cloud reconstruction of the wellbore casing cavity to be measured.

This application discloses a flow velocity tube, comprising: a tube body, which is a hollow tubular structure, comprising an inlet section, a contraction section, a measuring section, and a diffusion section in sequence along the fluid flow direction, wherein the inner cavities of the inlet section, contraction section, measuring section, and diffusion section are connected to form a main channel for fluid flow; a measuring element disposed in the measuring section of the tube body, the measuring element having a front end face facing the inlet section and a rear end face facing away from the inlet section, the front end face having a total pressure tapping hole, and the rear end face or outer peripheral wall having a static pressure tapping hole; wherein, the measuring element has an independent and parallel extending total pressure channel and a static pressure channel inside, the total pressure channel being connected to the total pressure tapping hole and extending to the outside of the measuring element to connect to a pressure sensor, the static pressure channel being connected to the static pressure tapping hole and extending to the outside of the measuring element to connect to a pressure sensor, the total pressure channel and the static pressure channel transmitting total pressure signal and static pressure signal respectively, for calculating the pressure difference or flow rate of the fluid.

The present application relates to a kind of differential pressure densimeter, including probe tube, two clamp connectors are provided on the probe tube, the clamp connector is communicated with probe tube, the end of the clamp connector away from probe tube is provided with PC112K core, the PC112K core blocks the opening of clamp connector, the bottom end of the probe tube is welded with blocking piece, the diameter of the blocking piece is equal to the diameter of probe tube, the side of gauge head body is threadedly connected with gauge head connector, the gauge head connector is threadedly connected with adapter, the bottom of the adapter is threadedly connected with probe tube. Different height pressure is measured by double pressure core, density information of liquid can be quickly obtained by calculation formula, users do not need complex training to easily operate, greatly simplify the measurement process, improve work efficiency.

This invention provides a positioning reflector for downhole control surveying, comprising a base pile, a reflective panel on top of the base pile, the reflective panel comprising an upper half and a lower half arranged in a mirror image, the upper half of the reflective panel having a reflective substrate, and the lower half being connected to the base pile via a sleeve; a circular target line and a crosshair are provided at the center of the reflective panel. This invention uses a positioning reflector to replace a prism, simplifying the process of setting up, leveling, and centering prisms for forward and backward control point targets, avoiding the influence of strong winds in the face tunnel on the measurement process and accuracy, and enabling precise and efficient completion of traverse control surveying, trigonometric leveling, and three-dimensional control point positioning.

The present application belongs to the technical field of magnetic resonance imaging, and relates to a method for measuring remanence in a magnetic resonance imaging system by using double echo. In the method, gradient echo and spin echo are measured continuously after a test gradient is applied, the difference in the effect of magnetic field inhomogeneity on the two echoes is used to measure the change in magnetic field homogeneity before and after a high-intensity gradient magnetic field is applied, and the change in echo peak value caused by the change is used to measure the strength of remanence. The method of the present application does not require additional measuring instruments, the measuring process is simple and easy to implement, and the spatial anisotropy of remanence can be measured. The measuring method simultaneously obtains gradient echo and spin echo in one scan, simplifies the test process, and can avoid the difference in the initial state of the two echoes caused by the magnetic hysteresis effect, thereby reducing the measurement error. The method can evaluate the influence of remanence on spatial positioning in imaging, and is particularly suitable for judging whether a permanent magnetic resonance imaging system meets the requirements of monitoring and navigation on spatial positioning in interventional therapy.

The utility model relates to the technical field of lower limb rehabilitation tools, in particular to a weight measuring device for lower limb movement, which comprises a sole pad, the sole pad comprises an upper pad layer, a support plate is mounted at the bottom of the upper pad layer, a plurality of grooves are arranged on the surface of the top of the support plate, and a pressure sensor is mounted in each groove. The top of the pressure sensor makes contact with the upper cushion layer, the bottom of the pressure sensor is fixed to the inner bottom wall of the groove, and a plurality of fixing pieces are installed at the bottom of the supporting plate. According to the weight measuring device for the lower limb movement, the pressure sensors are reasonably arranged in the grooves of the supporting plate, so that the pressure distribution and magnitude of the foot in the movement can be comprehensively and accurately captured, and the measuring accuracy is effectively improved. The pressure sensor is in close contact with the upper cushion layer, so that the sensor can accurately sense the change of the pressure applied by the foot in real time. And the upper cushion layer adopts the combined design of the stress plate and the soft cushion, so that the measurement accuracy is ensured, and good comfort is provided.

The invention discloses a porosity-based bolt pretightening force calculation method, which is characterized in that a relation formula between contact resistance and bolt pretightening force is established based on the porosity, the contact resistance can be measured by arranging electrodes at two ends of an interface, and the bolt pretightening force is calculated by combining easily obtained parameters of the same batch of materials. Compared with an existing method, a special measuring bolt does not need to be replaced, the measuring process is simplified, and the pre-tightening force calculation efficiency is improved.