199 results about "Diameter measurement" patented technology

The invention discloses a laser scanning optimization system for high-precision ellipticity and diameter measurement, and relates to the technical field of cylindrical workpiece geometric dimension measurement. Comprising a laser contourgraph assembly, the laser contourgraph assembly comprises four laser contourgraphs, the four laser contourgraphs are arranged in the circumferential direction of the cross section of a to-be-measured workpiece at equal intervals, the included angle between every two adjacent laser contourgraphs is 90 degrees, and the laser contourgraphs are used for synchronously collecting contour point cloud data of the surface of the to-be-measured workpiece; and the data acquisition module is used for receiving and summarizing the contour point cloud data. The four laser contourgraphs are arranged at equal intervals in the circumferential direction of the cross section of the workpiece and collect synchronously, so that the problems that a traditional single laser module is incomplete in rotary scanning coverage and has timeliness deviation are solved; and the point cloud processing module improves the condition of insufficient point cloud processing refinement through splicing, direction correction, section extraction, adaptive region division and arc length interception processing.

There is provided an inside-diameter measuring unit capable of automating inside-diameter measurement and a control method for automatic inside-diameter measurement. An inside-diameter measuring part is supported by a support frame part via a floating joint part. The floating joint part includes a rotation-allowing mechanism part and a translation-allowing mechanism part. A measuring head part of the inside-diameter measuring part is inserted into a hole by a robot arm part. The inside-diameter measuring part adjusts its position and posture autonomously by the reaction force when a contact point pushes against the inner wall of the hole to align the axis of the inside-diameter measuring part with the axis of the hole. An electric inside-diameter measuring unit can automatically measure the inside diameter of a hole.

Disclosed is a workpiece diameter measurement method including the steps of: measuring coordinates of a point P that is on an outer circumferential surface of a cylindrical workpiece that is supported such that a rotary axis of a main spindle of a machine tool and a central axis of the cylindrical workpiece coincide with each other, the coordinates having a maximum or minimum coordinate in a first direction that is orthogonal to the rotary axis; calculating a distance D2 in the first direction between the point P and a reference point Q that is a point at which a distance D1 in the first direction from the rotary axis is known; and calculating a workpiece diameter of the cylindrical workpiece based on the distance D1 and the distance D2.

The invention relates to the technical field of steel wire rope state detection, in particular to a steel wire rope diameter measuring method and system based on event compensation correction. According to the technical scheme, the system comprises an imaging module, a boundary initial extraction module, a dynamic motion estimation module, a dynamic correction compensation module and a diameter calculation module. The imaging module comprises a traditional camera, an event camera, an optical component, a synchronous triggering device and a spectroscope. The traditional camera is used for collecting frame images of the steel wire rope. According to the method, on the basis of complementary advantages of an event camera and a traditional camera, systematic measurement deviation under the dynamic working condition is solved from the mechanism through an event-driven dynamic geometric compensation model, and quasi-static imaging dependence is broken through. The method does not need extra constraint or increase of frame rate, control cost and hardware complexity, avoids the problems of reduction of signal-to-noise ratio and the like, realizes high-precision stable measurement under high-speed and vibration working conditions, adapts to online monitoring of multiple industrial scenes, and is remarkable in practicability and application value.

The invention discloses a blood vessel inner diameter correction method and device based on an X-ray total attenuation conservation principle and a storage medium, and belongs to the technical field of medical image processing. The core of the method is to discover and utilize the total net attenuation of a blood vessel filled with a contrast agent in an actual motion state and the total net attenuation of the blood vessel in an ideal static state to be kept in conservation. The method comprises the steps that an angiography image is acquired, and a target area and an initial inner diameter measuring line are determined; calculating the gray scale decline amount and the maximum value of each pixel of the line; on the basis of the conservation principle, the inner diameter of the blood vessel in an ideal state is inversely calculated through the formula that the inner diameter is corrected to be equal to sigma [(delta Ii / delta Imax) * Li]. Furthermore, based on the same principle, the method can be expanded and applied to correction of the two-dimensional contour of the target blood vessel. According to the method, errors caused by motion artifacts and resolution limitation are fundamentally compensated through a volume measurement method based on integration and distribution, and the method is particularly suitable for accurate measurement of severe stenosis blood vessels.

The invention relates to the technical field of rubber detection, in particular to a rubber part quality detection device and a detection method thereof. The device comprises a detection index plate, a support and two lifting devices are sequentially arranged on the periphery of the detection index plate, a laser diameter measuring sensor is arranged on the support, and the laser diameter measuring sensor is arranged above a vibration disc feeder in a suspended mode and used for measuring the diameter of a passing rubber part. A top view camera and a side view camera are connected to the lifting device, an annular lamp is fixedly arranged on the periphery of a lens of the top view camera, a supporting rod is fixedly connected to the lifting device corresponding to the side view camera, and a parallel backlight lamp is arranged at the end of the supporting rod; light shields are arranged on the peripheries of the annular lamp and the parallel backlight lamp, baffles are movably arranged in the light shields, and driving assemblies are connected between the baffles and the light shields; the driving assembly adjusts the rotation angle of the laser diameter measuring sensor according to detection data of the laser diameter measuring sensor, drives the baffle to move in the light shield, and adjusts the local shielding range of the baffle to the light emitting area of the corresponding light source.

The invention discloses a power transmission line conductor diameter measurement method and system based on an unmanned aerial vehicle image, and the method comprises the steps: obtaining a multi-view image of a power transmission conductor through an unmanned aerial vehicle, and recording the shooting pose and distance information at the same time; carrying out distortion removal and geometric correction processing on the multi-view image to obtain the pixel width and parallax of the lead, and calculating a first estimated value of the lead diameter and the uncertainty of the first estimated value according to the parallax; obtaining a reference image containing the wire and the insulator through the unmanned aerial vehicle, identifying the model of the insulator and obtaining the real size of the insulator, and calculating a second estimated value of the wire diameter and the uncertainty of the second estimated value through the real size of the insulator according to the proportional relation; and carrying out consistency check on the first estimation value and the second estimation value, and obtaining a fusion line diameter result by adopting a weighted fusion algorithm. According to the invention, through fusion of three-dimensional measurement and reference object inference, high reliability and accuracy of wire diameter measurement are still maintained in a complex environment, and an efficient and safe solution is provided for power transmission line inspection.

This utility model discloses a transmission shaft outer diameter measuring instrument, relating to the field of outer diameter measurement technology. It includes a housing, control panel, mounting plates, long rods, and electronic components. Multiple sets of mounting plates and long rods are vertically distributed and fixed to form a frame, which is divided into a left frame and a right frame. In this utility model, the control panel controls the electronic components to start a servo motor, causing a lead screw to rotate inside a lead block. This causes the lead block to move a laser rangefinder sensor along the length of a smooth rod. The control panel, through the electronic components, controls the laser rangefinder sensor to emit continuously modulated laser light. The distance is calculated by measuring the phase difference between the emitted and reflected light. The distance between the laser rangefinder sensor and the transmission shaft remains constant, and the rotating shaft maintains its rotation. Measurements are performed, and the measurement data is processed by the electronic components and displayed on the control panel's display screen in the form of a line graph, thereby achieving non-contact quantitative detection of the transmission shaft.

This invention discloses a device for measuring the roll diameter of an uncoiler head based on a laser rangefinder, belonging to the field of roll diameter measurement technology. The device includes an uncoiler, a lifting machine, an uncoil assembly, an automatic cleaning and detection assembly, and a roll diameter measurement and control system. The detection assembly integrates a laser rangefinder sensor and a blowpipe. The roll diameter measurement and control system includes a data acquisition module, a data analysis and processing module, and an execution control module. The data acquisition module completes multi-source data acquisition and analog-to-digital conversion. The data analysis and processing module performs data filtering, roll diameter calculation, and sensor contamination determination. The execution control module triggers automatic blowpipe cleaning, adjusts the tension and speed of the uncoiler in conjunction with the uncoiler, and coordinates the lifting machine's movement. The blowpipe can perform graded cleaning according to the contamination level. This device eliminates dust interference with detection, ensures stable roll diameter measurement data, and achieves automatic cleaning of the laser rangefinder sensor, constant tension closed-loop control of the uncoiler, and coordinated operation of the equipment.

The invention relates to a stumpage diameter at breast height measuring method and device, computer equipment and a storage medium, a rectangular positioning mark with four corner points is arranged in a target chest height area of a stumpage to be measured, a camera is utilized to shoot a stumpage image containing a trunk and the positioning mark, and meanwhile, inherent parameters of the camera and actual size information of the positioning mark are obtained. Identifying a trunk image in the standing tree image and the pixel position of each corner point of the positioning identifier, calculating the size information of the positioning identifier in the image, and further establishing a first image space coordinate system; and meanwhile, determining space pose parameters of the camera relative to the first image space coordinate system according to inherent parameters of the camera, the pixel position of the positioning identifier and the actual size information. And finally, according to the established first image space coordinate system and the camera space pose parameters, determining a projection image of the breast height section of the stumpage to be measured in the trunk image, and analyzing edge pixel points of a projection area to solve the diameter of the breast height section as the diameter at breast height.

The invention relates to the technical field of wig production, in particular to a hair bundle diameter measuring device and system. The device further comprises a driving mechanism and a measuring mechanism, and the driving mechanism and the measuring mechanism are both installed on the supporting mechanism. The driving mechanism is matched with the supporting mechanism, so that the hair bundle diameter measurement convenience and accuracy are improved; through an image shooting mode, a deep learning model is adopted to realize accurate analysis of the diameter and the quality of the hair bundle; the structure is simple, the size is small, the modular structural design is adopted, and installation and maintenance are convenient; the tension sensor is adopted to ensure the same tension every time, so that the measurement accuracy of the diameter of the hair bundle is improved.

The application discloses a cable winding device and belongs to the technical field of power cables. The device comprises a straightening mechanism, a cutting mechanism, a wire diameter measuring mechanism, a tension control mechanism and a guide mechanism arranged in sequence on a workbench; the left sliding block and the right sliding block of the wire diameter measuring mechanism respectively form a screw pair with a forward and reverse toothed rod, and are respectively attached with a pressure sensitive film through a left antenna and a right antenna; one end of a diameter measuring slide base is provided with a diameter measuring encoder; the flexible arm support body of the tension control mechanism is connected with the root joint body and the primary joint body through a series hinge, and is connected with the root joint body through a telescopic linear driving mechanism; the root joint body and the primary joint body are respectively hingedly connected with a recessed rotating shaft pulley. The application solves a series of problems such as diameter measurement and tension control, is not only complete in function, but also suitable for winding various small and heavy cables, and can significantly improve the winding efficiency and ensure the winding quality.

The invention discloses a method for measuring and calculating the diameter of a carbon fiber by a weighing method, which comprises the following steps: pretreatment: removing a sizing agent on a carbon fiber tow to be measured and calculated to obtain a pretreated carbon fiber tow; and calculating: selecting more than two carbon fibers from the pretreated carbon fiber tow as samples, and calculating the d average of the carbon fibers in the pretreated carbon fiber tow according to d average = square root of [4m / (epsilon pi rho L total)]. The to-be-measured carbon fiber tow is pretreated, so that the interference of a sizing agent can be eliminated, and the authenticity of diameter measurement is guaranteed; actual density rho is introduced to replace a general value, and the influence of batch fluctuation can be overcome; a plurality of sampling and correction coefficients epsilon are adopted, and the non-circularity and representativeness of the section are considered. The above means cooperate to make the weighing method really adapt to the material characteristics and structural characteristics of the carbon fibers, system errors are inhibited from the source, and the accuracy and repeatability of measurement results are significantly improved.

The present application relates to steel wire rope state detection technical field, especially in kind based on event compensation correction steel wire rope diameter measurement method and system, its technical scheme includes imaging module, boundary initial extraction module, dynamic motion estimation module, dynamic correction compensation module and diameter calculation module, the imaging module includes traditional camera, event camera, optical component, synchronous trigger device and beam splitter, the traditional camera is used for collecting the frame image of steel wire rope, the present application relies on the complementary advantages of event camera and traditional camera, through event driven dynamic geometric compensation model, the systematic measurement deviation under dynamic working condition is solved from the mechanism, the breakthrough of quasi-static imaging dependence is broken through, without additional constraint or frame rate promotion, control cost and hardware complexity, avoid signal-to-noise ratio decline and other problems, realize high-precision stable measurement under high speed, vibration working condition, adapt to multi-industrial scene online monitoring, practicality and application value are remarkable.

This invention relates to the field of monocrystalline silicon rod production, and specifically to a method for detecting the diameter of a lead crystal. The method includes: defining a lead crystal diameter detection area in an image of the lead crystal process; extracting a set of feature points representing the outer contour of the bright portion of the lead crystal aperture within the detection area; performing circle fitting on the outer contour feature point set to obtain a fitted circle diameter in pixels, and converting the fitted circle diameter into a physical diameter, denoted as D0; standardizing the image within the detection area; inputting a pre-trained classification model, and outputting a long point similarity judgment result, denoted as A1; processing multiple consecutive long point similarity judgment results A1 to obtain the probability of a long point existing in the current lead crystal aperture, denoted as A2; and combining the physical diameter D0 with the long point existence probability A2 to calculate the compensated lead crystal diameter, thereby achieving real-time identification of abnormally protruding long points in the lead crystal aperture and dynamically compensating the diameter measurement value accordingly.

The utility model relates to the technical field of pipe diameter measurement, in particular to an inspection well inner pipe diameter measuring device which comprises a limiting sleeve and a sliding rod, the limiting sleeve is sleeved on the sliding rod in a sliding mode, the bottom of the sliding rod is fixedly connected with a limiting plate, and one side of the bottom of the limiting sleeve is fixedly connected with a first clamping plate. A second clamping plate is fixedly connected to one side of the limiting plate, a first grabbing rod is fixedly connected to one side of the upper end of the limiting sleeve, a second grabbing rod is fixedly connected to one side of the upper end of the sliding rod, the length of the sliding rod is larger than that of the limiting sleeve, and scale marks are arranged on the upper portion of the sliding rod. The first clamping plate and the second clamping plate are matched to clamp a pipeline, the scale marks are arranged on the sliding rod, reading can be conveniently carried out, pipe diameter measurement data can be visually obtained, workers do not need to enter an inspection well for measurement, measurement is convenient, and personnel safety can be guaranteed.

The application relates to an automatic flowmeter online calibration device, and relates to the technical field of industrial automatic detection equipment, which comprises a vehicle frame, four sides of the vehicle frame are provided with magnetic driving wheels with electromagnetic modules, a cover seat is fixed to the top side of the vehicle frame, a wireless module and a camera probe are arranged on the cover seat, diameter measuring units are symmetrically arranged on the front and back sides of the cover seat, a flow monitoring unit is embedded in the cover seat, and a pipeline ultrasonic thickness measuring module is arranged on the side of the cover seat; the flow monitoring unit comprises a liftable carrier, a pitch adjusting structure and a polishing structure are arranged on the bottom of the carrier, and a laser emitter and a first transducer, a laser receiver and a second transducer are fixed to the left and right sides of the pitch adjusting structure respectively. The application integrates walking adsorption, pipe diameter measurement, surface pretreatment and automatic transducer pitch adjustment, realizes the full-process automation of ultrasonic flowmeter online calibration, eliminates the hidden troubles of manual climbing and limited space operation, and improves the transducer installation precision and calibration reliability.

This invention claims protection for a cable diameter measuring device, comprising a telescopic hand rod, a connecting plate, an upper clamping plate, a lower clamping plate, an operating assembly, a telescopic control component, and a distance sensor. The connecting plate is disposed at one end of the telescopic hand rod, which is used to adjust the extension length of the connecting plate. The upper clamping plate is slidably connected to the connecting plate, and the lower clamping plate is fixedly connected to the connecting plate. The telescopic control component is disposed on the lower clamping plate, and its control end is connected to the upper clamping plate. The telescopic control component is used to control the upper clamping plate to move closer to or away from the lower clamping plate. The distance sensor is disposed on both the upper and lower clamping plates and is used to measure the distance between the upper and lower clamping plates. The cable diameter measuring device of this application has an adjustable length, and the telescopic hand rod is made of insulating material, allowing users to safely measure cable diameter remotely and avoiding accidents.

The utility model provides a kind of narrow groove diameter measuring device, including bottom plate, the left end of the upside of bottom plate is provided with left support, right end is provided with right support, the upper end of right support is provided with groove positioning column, the back of right support is provided with measuring mechanism, measuring mechanism includes height and angle adjustable measuring table, the measuring head of measuring table corresponds with groove positioning column, calibration block is placed on right support, calibration block is used for measuring table zero adjustment.

The invention discloses a real-time wire diameter detection method and system for multiple metal welding strips, and relates to the technical field of photoelectric measurement. The method comprises the following steps: enabling the multi-metal welding strip in linear motion to pass through a constant backlight illumination area to generate a high-contrast projection; the linear array CCD is controlled to perform continuous line scanning in a scanning mode in the vertical movement direction to obtain image frames; determining left and right edge coordinates of sub-pixel precision based on a gray gradient edge extraction algorithm; and calculating a line diameter measurement value according to the edge coordinate difference value and the calibration coefficient, and performing real-time filtering. The system correspondingly comprises a backlight illumination module, an image acquisition module, an edge processing module and a wire diameter calculation module. Reflection interference is eliminated through backlight illumination, the linear array CCD is used for high-speed scanning to adapt to the motion state, the precision is improved in combination with a sub-pixel algorithm, and the problem of high-precision real-time detection of the wire diameter of the metal welding strip under the high-speed condition is effectively solved.

The invention belongs to the field of measurement, and relates to an aero-engine blade film hole diameter measurement method, which comprises the following steps: 1) acquiring an aero-engine blade film hole by using an optical camera, and obtaining three-dimensional contour point cloud original data of the film hole; 2) performing denoising processing on the three-dimensional contour point cloud original data of the film hole obtained in the step 1) to obtain denoised three-dimensional contour point cloud data Ci of the film hole; 3) constructing a high-precision gas film hole full-contour point cloud model HC based on the denoised gas film hole three-dimensional contour point cloud data Ci obtained in the step 2); 4) extracting a film hole round and straight section point cloud model from the high-precision film hole full-contour point cloud model HC to obtain film hole round and straight section point cloud data; and 5) obtaining the minimum aperture of the gas film hole point cloud according to the gas film hole round and straight section point cloud data obtained in the step 4). The invention provides the aero-engine blade film hole diameter measurement method which is high in detection precision and can effectively improve the detection efficiency.

The application discloses a kind of asymmetric three-point inner diameter measuring gauge and method, belong to measuring tool technical field;Including general inner diameter dial gauge, as measuring main body;It further includes auxiliary measurement module, the auxiliary measurement module is connected with the fixed measuring head of general inner diameter dial gauge by lengthening connecting rod, including two self-adapting telescopic measuring rod legs, its root is installed in the tail end of lengthening connecting rod, head and measurement surface contact;And the included angle between two measuring rod legs can be adaptively adjusted, and asymmetric point measurement can be realized.The application takes general inner diameter gauge as measuring main body, can ensure measurement accuracy;Increase auxiliary measurement module on the basis of measuring main body, i.e. two self-adapting telescopic measuring rod legs, and the angle between two measuring rods is adjustable and locked.The gauge can measure the diameter of the side window, opening or odd measurement points with uniform but asymmetric diameter after calibrating the diameter size required for measurement with special calibration ring.

This invention discloses a method for CO2 continuous laser cutting of CFRP material. The method employs a CO2 continuous laser engraving and cutting system to cut CFRP material. After adjusting the corresponding working parameters, a portion of the CFRP material to be cut is taken as a sample, and a rectangle is obtained through trial cutting. The diameters of the pits generated by the spot laser are measured horizontally and vertically twice, and the average diameter is calculated. Simultaneously, the continuous laser power density is calculated, and the height difference between the four corners and the center of the rectangle is measured to obtain the surface fluctuation value (Fv). Different scanning speeds, number of consecutive processing cycles, and Z-axis scale values ​​are selected, and trial cutting is repeated on the sample. When the measured Fv is at its minimum value, the thermal damage to the material is minimized. The scanning speed, number of consecutive processing cycles, and Z-axis scale value at this minimum value are used as the working parameters for cutting the CFRP material. This invention effectively controls the thermal damage to the CFRP material during processing and improves the processing effect of laser-processed CFRP material.

The invention belongs to the field of intelligent manufacturing equipment, and particularly relates to an interactive service control system for measuring the inner diameter of a pipe hole, the system is realized by using an operation computer, and the operation computer comprises a UI interface, a service logic layer, a robot control module, an inner diameter measurement control module and an algorithm module; a user inputs an instruction through a UI interface, and the business logic layer achieves corresponding functions according to the input instruction and controls the robot control module, the inner diameter measurement control module and the algorithm module to work cooperatively. The robot control module controls the crawling robot to automatically position the position of the heat exchange tube hole, and carries the inner diameter measuring device to move to the heat exchange tube hole to be detected according to the detection path; the inner diameter measurement control module controls the inner diameter measurement device to enter the pipe hole, collect inner diameter data of the pipe hole and exit from the pipe hole; and the algorithm module calculates the inner diameter of the pipe hole according to the received inner diameter data of the pipe hole. The system can improve the pipe hole inner diameter measurement efficiency, is simple and visual in operation, and reduces the measurement error and the omission ratio.

This invention discloses a wire core stabilizing frame for a wire and cable diameter gauge, comprising a support column, a mounting base, two sets of spring-loaded movable pulley assemblies, a fixed pulley assembly, U-shaped guide wheels, a height adjustment mechanism, and a horizontal fine-tuning mechanism. A fixed base is provided at the bottom of the support column. The height adjustment mechanism adjusts the vertical height of the mounting base, and the horizontal fine-tuning mechanism fine-tunes the horizontal position of the movable and fixed pulley assemblies to achieve precise alignment with the diameter gauge. U-shaped guide wheels at the inlet and outlet ends of the mounting base limit wire core swaying, while the movable pulley assembly with a spring-loaded mechanism counteracts Z-axis jitter, further enhancing wire core stability in conjunction with a lateral compression spring. The spring-loaded mechanism includes a pressure sensor and a control panel for precise pressure adjustment. This invention achieves dual precise wire core positioning, ensuring coaxiality and angular consistency upon entering the diameter gauge, improving measurement accuracy. It is also highly adaptable, easy to operate, and protects the wire core, making it widely applicable in online diameter measurement processes such as wire and cable drawing and extrusion.

The utility model relates to the technical field of pipeline detection, and discloses a device for measuring the pipe diameter of a plastic-lined anti-corrosion pipeline. The supporting table is arranged at the top of the workbench and used for containing the lining plastic pipeline; the positioning shaft is arranged at the top of the workbench, a plurality of first connecting rods are arranged outside the positioning shaft, and second connecting rods rotationally connected with the positioning shaft are rotationally connected to the first connecting rods; the bottom side of the outer wall of the measuring cone can make contact with the outer wall of the plastic-lined pipeline, the initial scale of the scale plate can correspond to the bottom side of the outer wall of the measuring cone, at the moment, the scale plate and the reference opening can be observed, the radius of the plastic-lined pipeline can be obtained, and therefore the purpose of measuring the pipe diameter of the pipeline is achieved. According to the positioning device, the center shaft of the plastic-lined pipeline can be accurately positioned through the positioning component, errors are reduced, and meanwhile the labor intensity of operators is reduced.

The invention discloses an absolute measurement method and device for the density of molten salt and solution, and belongs to the field of molten salt physical property tests.The measurement method comprises the steps that 1, a cone and cylinder composite heavy hammer is adopted to measure the density of the molten salt or solution; 2) arranging two measuring positions on the cylinder section of the heavy punch, taking the section between the two measuring positions as a middle measuring section, the length of the middle measuring section is equal to the distance between the two measuring positions, the diameter of the middle measuring section is equal to the diameter of the cylinder of the heavy punch, and measuring at the two positions in sequence; (3) the density of the fused salt or the solution is determined by the volume of the middle measuring section of the heavy hammer and the buoyancy borne by the middle measuring section, so that the density of the fused salt and the solution is deduced; according to the method, a long-distance microscope system is adopted to directly measure the thermal expansion of the heavy hammer at high temperature, calibration by a standard substance is not needed any more, when the method is adopted to measure the density of the fused salt and the solution, the volume of the heavy hammer does not need to be calibrated, additional force caused by surface tension is completely removed, the measurement process is greatly simplified, and the measurement precision is improved.

The utility model relates to municipal works pipe jacking construction technology field discloses a kind of folding linear pipe jacking line shape measuring devices, including clamping mechanism, folding ruler, adjustable target and the telescopic fixing mechanism for locking the included angle between clamping mechanism and folding ruler;The clamping mechanism is used to clamp the measuring device in the end of pipe wall two sides of construction pipe jacking;Folding ruler one end articulates clamping mechanism;Folding ruler is provided with recess along length direction, and folding ruler is divided into several short rulers, and short ruler is connected with hinge;Laser source and reflector are provided on the adjustable target, and adjustable target is embedded recess to form sliding connection;The telescopic fixing mechanism includes telescopic link and first fixed bolt.The utility model integrates clamping, extension, measurement, target and locking function in one, adapt to the narrow space limit of construction;The short ruler design of folding ruler meets different pipe diameter measurement demand;Telescopic link adjusts included angle, ensures that folding ruler is perpendicular to pipeline axis, reduces inclination error.

The utility model discloses a pile hole diameter detection device for highway construction. The pile hole diameter detection device comprises a base support. The leveling support structure comprises a first support and a second support, the first support is rotationally arranged on the base support, the second support is rotationally arranged on the first support, and a double-shaft gradienter is arranged in the middle of the second support; the leveling limiting structure comprises at least one group of first adjusting assemblies arranged on the base bracket, and the first adjusting assemblies are configured to be in abutting fit with the first bracket; the at least one group of second adjusting assemblies are configured to be in abutting fit with a second bracket so as to horizontally arrange the second bracket; and the aperture measurement structure comprises a vertical connecting rod and an aperture detection assembly, the upper end part of the vertical connecting rod is vertically and fixedly connected with the middle part of the second bracket, and the aperture detection assembly is arranged at the lower end part of the vertical connecting rod. The technical problems that an existing measuring device is prone to being affected by the field flatness, and the horizontal reference is still unstable due to single-axis leveling are solved.