71 results about "Gauge (instrument)" patented technology

The utility model provides an efficient double-diameter synchronous comprehensive measuring instrument, which relates to the technical field of measuring instruments and comprises a supporting seat, a convex cover plate is fixed and communicated to the top of the supporting seat and close to the center, a square groove is formed in one side wall of the convex cover plate and close to the top, inner diameter grooves are symmetrically formed in the inner wall of the square groove, and the inner diameter grooves are communicated with the convex cover plate. The two side walls of the convex cover plate are each fixedly provided with four measuring heads, one end of each measuring head is provided with a first spray head in an embedded mode, an air source device is arranged in the supporting base, the top of the air source device is fixedly communicated with a connecting pipe, and the top of the connecting pipe is fixedly connected with a convex box; according to the utility model, the part is embedded into the inner diameter groove and the measuring head, and then the first nozzle and the second nozzle are used for spraying gas, so that the inner diameter and the outer diameter of the part can be synchronously measured, the use and the operation are simple, the measurement is convenient, the size of the part is out of tolerance, the out-of-tolerance can be displayed on a screen of a pneumatic gauge, and visual fatigue is avoided; and quality control is facilitated.

The utility model discloses the technical field of machining measurement device, more specifically discloses a kind of for the size measurement tool of incomplete circle, comprising: tool main body, detachably set on part;Compensation component, set on tool main body, can be synchronous with the arc to be processed Machining;Wherein, the straight line of the center of the arc to be processed of compensation component and arc to be processed can pass through arc to be processed;Measuring component is used to measure the diameter between compensation component and arc to be processed;By using the utility model, arc can be measured in real time during processing, cancel the use of radius gauge and three-dimensional coordinate instrument;Greatly reduce the difficulty of real-time measurement arc actual size in part processing process, improve the arc size measurement stability and accuracy, can effectively improve the product quality and stability of part.

1. Name of the product in this design: Diamond measuring instrument (capable of measuring a small diameter of 1mm). 2. Application of this design: Probe for online precision measurement of machine tools. 3. The key design feature of this product is its shape. 4. Images or photos that best illustrate the design key points: composite state diagrams.

The invention discloses a four-axis diameter measuring instrument and a method thereof, belongs to the technical field of diameter measuring instruments, and provides the following scheme that the four-axis diameter measuring instrument comprises an adjustable four-axis diameter measuring mechanism, a preprocessing mechanism is arranged on the adjustable four-axis diameter measuring mechanism, and the adjustable four-axis diameter measuring mechanism comprises a fixed base and two fixed shells; one of the fixed shells is fixedly connected to the fixed base; according to the invention, through the detachable design of the two laser multi-axis diameter measuring instruments, the two laser multi-axis diameter measuring instruments can operate independently and finish diameter measurement of two separated wires synchronously when processing batch single-specification wires and improving the efficiency, and the two laser multi-axis diameter measuring instruments can be combined to form a four-axis measuring system when comprehensive detection of high-precision wires is needed. The four-dimensional synchronous measurement of the wire rod is realized, multiple adjustment is not needed, the problems of low single-mode efficiency and complicated multi-dimensional operation of the traditional equipment are solved, the wire rod can be cleaned in advance through the cleaning assembly before diameter measurement, and the accuracy of measured data is ensured.

The invention discloses a method for measuring straightness circle run-out of a spinning cylinder, which not only adapts to spinning cylinders with different lengths and outer diameters, but also can avoid the problem of deformation of a thin-wall spinning cylinder caused by clamping of a traditional manual detection platform through a roller base and a roller which are adjustable in spacing, and guarantees the stability of a measurement reference. Meanwhile, expensive and complex equipment such as a laser interferometer and a three-coordinate detector does not need to be relied on, the detection cost of the large or overweight spinning cylinder is effectively reduced, and the high-cost burden brought by a special customized instrument is eliminated; by means of the PLC servo system, constant-speed sliding of the dial indicator and constant-speed autorotation of the spinning cylinder are achieved, operation is convenient and fast, controllability is high, comprehensive measurement of generatrix straightness at different angles and run-out of different section circles can be accurately completed, detection accuracy, practicability and economical efficiency are considered, and detection requirements in actual production are better met. The device is especially suitable for a thin-wall spinning cylinder, external force cannot be applied to the spinning cylinder in the measurement process, and the deformation risk caused by measurement operation is avoided.

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 pressure instrument testing, and discloses a pressure instrument testing device which comprises a support, a plurality of outer shells arranged at equal intervals are installed on the upper surface of the support, adjusting devices used for adjusting environment variables are arranged in the outer shells, a detection pipeline is arranged above the support, and the detection pipeline is communicated with the outer shells. The detection pipeline penetrates through the outer shell, and the contact position of the detection pipeline and the outer shell is coated with sealant. According to the pressure instrument testing device, the pressure gauge bodies of the same specification are installed in the outer shells, the environments in the outer shells are different by opening and closing the corresponding electromagnetic valves, different variable comparison tests under the same model are achieved, or the pressure gauge bodies of different specifications are installed in the outer shells, so that the test efficiency is improved. By opening and closing the corresponding electromagnetic valves, the internal environment of each outer shell is the same, parallel contrast test under the same condition is realized, more comprehensive detection is further realized, and the detection efficiency is improved.

This invention provides a bolt tightening management system that allows for simpler and more accurate evaluation of the quality of hydraulic tightening. [Solution] The bolt tightening management system 1 manages the tightening of bolts in multiple fastening parts 90 to which hydraulic tightening is applied by a tensioning device 50 which comprises a housing part 51 for housing bolts 93, a movable part 52 that screws with the bolts 93 and forms an oil chamber 53 between itself and the housing part 51, and a pump 55 that supplies pressurized oil to the oil chamber 53. The bolt tightening management system 1 comprises a pressure gauge 11 for measuring the pressure of the pressurized oil discharged from the pump 55, an elongation measuring instrument (dial gauge 12) for measuring the elongation of the bolts 93, which is the difference in length of the bolts 93 before and after the supply of pressurized oil, and a storage device (server 3) that stores the measured pressure and elongation values ​​so that they can be output in association with the fastening parts 90.

1. Name of the product in this design: Universal Magnetic Meter Stand. 2. Purpose of this design: For clamping and adjusting gauges and other measuring instruments. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The application belongs to the technical field of engine maintenance, and particularly relates to a hole-probe inspection auxiliary device for multiple components after the whole engine test run. The device comprises a positioning chuck (1), a circumferential positioner (2) and a depth gauge (3), the positioning chuck (1) is fixed on a hole-probe instrument seat of an outer-duct casing (7), the circumferential positioner (2) is rotationally arranged at the middle opening of the positioning chuck (1) and has a pointer (24), the depth gauge (3) comprises multiple sliding sleeves and is slidingly arranged on the circumferential positioner (2), a detection line guide tube (6) penetrates through the multiple sliding sleeves and extends into the engine, when the circumferential positioner (2) is rotated, the bottom end of the detection line guide tube (6) is deflected at a specified height directly below the positioning groove (11). The application can determine the specific position of the detection probe and control the movement of the detection probe, and can realize the inspection of special positions and avoid the detection probe from being stuck during the detection process.

The invention discloses a glue joint surface gap detection method for an aircraft composite material assembly, and the method comprises the steps: fixing an assembly composite material on a shape maintaining frame, and enabling a rigid composite material to be stably placed; and a three-dimensional shape measuring instrument is used for respectively measuring space coordinate point clouds of the molded surface of the cementing contact surface and the molded surface of the to-be-cemented surface. And making glue joint area mark points in the matching areas of the to-be-glue-jointed surface molded surface and the glue joint contact surface molded surface by using the data identification, and obtaining the glue joint area mark points. And data registration and iterative alignment from the to-be-glued surface molded surface to the glued contact surface molded surface are completed based on the glued area mark points of the to-be-glued surface molded surface and the glued contact surface molded surface, and a registered to-be-glued surface molded surface space coordinate point cloud is obtained. And finally, selecting the molded surface of the cementing contact surface as a reference surface and the registered molded surface to be cemented as a detection surface, calculating a normal distance D between a space point on the reference surface and a space point on the detection surface, and further obtaining a gap value and a gap area between the reference surface and the detection surface. According to the invention, measurement and simulation calculation are carried out on the composite material assembly in an unassembled state, so that the defect of filler gauge measurement after assembly of parts in the past is overcome, gap detection of any spatial position of the bonding surface of the composite material part can be realized, and relatively good practicability is achieved.

The utility model provides a floating ball liquid level meter. The floating ball liquid level meter comprises a guide rod; the machine head is positioned on one axial side of the guide rod; the installation structure is located between the guide rod and the machine head, the installation structure is provided with a wiring through hole formed in the axial direction of the guide rod, the installation structure comprises an insertion section and an installation section which are arranged in the axial direction of the guide rod, the insertion section is located on the side, close to the guide rod, of the installation section, and a first step structure is formed between the insertion section and the installation section; the first step structure is provided with a first annular step face surrounding the periphery of the insertion section, an annular crimping matching face is arranged on the side, away from the insertion section, of the installation section, and the crimping matching face surrounds the periphery of the connection position of the installation section and the machine head. According to the floating ball liquid level meter provided by the utility model, the instrument mounting pipe which does not need to be assembled with the floating ball liquid level meter is provided with an internal thread, so that the internal thread can be prevented from being arranged on the inner surface of the instrument mounting pipe of the solution tank, and the risk of solution pollution caused by residual stains at the internal thread of the instrument mounting pipe is avoided.

The utility model relates to a transmission shaft retainer inner sphere diameter detector, in particular to a retainer inner sphere diameter detector for a fixed end joint and a movable end joint of a car constant velocity universal joint transmission shaft, which comprises a support, a rotating shaft A, a rotating shaft B and a positioner, a measuring rod A is rotatably connected to the rotating shaft A, the measuring rod A is perpendicular to and fixedly connected with a measuring head A, a measuring rod B is rotatably connected to the rotating shaft B, and the measuring rod B is perpendicular to and fixedly connected with a measuring head B; a gauge rod of the dial gauge and the measuring rod B are fastened through a screw, a contact on the dial gauge makes contact with the end face of a screw installed on the measuring rod A, one end of the bolt penetrates through the measuring rod A and is in spiral connection with the measuring rod B, the spring is sleeved on the bolt, the positioner is provided with a spherical groove, a square notch, a groove opening A and a groove opening B, the square notch is opposite to a reamed hole in the working table plate, the measuring head A is opposite to the groove opening A, and the groove opening B is opposite to the groove opening B. And the measuring head B is opposite to the groove opening B. When the detector is used for measuring the inner ball diameter of the retainer, not only is the measurement convenient, but also the detection precision of the inner ball diameter of the retainer can be ensured.

The utility model relates to a double-isolation static force level gauge for surveying and mapping, which belongs to the technical field of force measuring devices and comprises two guide barrels, two guide push rods and a cavity isolation layer, the two guide barrels are symmetrically arranged in an outer shell, one ends of the two guide barrels are respectively connected with the inner end faces of two end covers, and the other ends of the two guide push rods are respectively connected with the cavity isolation layer. The two guide push rods are inserted into the two guide barrels respectively, one ends of the two guide push rods make contact with the first sensor and the second sensor respectively, the two guide push rods can axially move in the corresponding guide barrels respectively, and the two end faces of the cavity isolation layer are close to the other ends of the two guide barrels respectively. The two end faces of the cavity isolation layer make contact with the other ends of the two guide push rods respectively. The static force level gauge has the beneficial effects that when the pressures in the two separated inner cavities are not equal, the static force level gauge is in a non-static force state, and when the pressures in the two separated inner cavities are equal, the static force level gauge is in a static force state, so that the static force detection between the two cavities is improved.

This invention relates to the field of stepped hole measurement technology, and in particular to a precision internal step gauge. It mainly includes a dial indicator, an internal step gauge body, a support nut, a support spring, a support screw, and an internal groove probe. This invention primarily utilizes a lever to convert linear movement into pointer rotation, and then uses a scale dial for reading the length measurement instrument. Compared to previous profilometers and three-dimensional coordinate measuring machines, this invention allows for online step measurement, offering convenience, flexibility, and high fabricationability.

The invention discloses a high-precision sheet thickness detector in the technical field of thickness detection, and the high-precision sheet thickness detector comprises a thickness gauge body, a guide feeding roller, a linkage cradle and a clamping positioning roller, and a measuring arm of the thickness gauge body is fixedly provided with an overhanging object placing table corresponding to a measuring end; guide feeding rollers with upper edge lines flush with the top surface of the overhanging object placing table are arranged on the two sides of the overhanging object placing table, an equipment box in sliding connection with the measuring arm is arranged at the rear ends of the two sets of guide feeding rollers, and a driving part used for controlling the two sets of guide feeding rollers to rotate synchronously is arranged in the equipment box; the problems that in the prior art, a thin material thickness gauge is not convenient to achieve automatic continuous detection, detection points are prone to being distributed unevenly, defects are prone to missing detection and the like, a bag-shaped or annular thin film needs to be cut into single pieces in advance, the actual thickness measurement operation is tedious, and the instrument cannot meet the requirements for continuous, efficient and nondestructive detection are solved.

The invention discloses an overpressure elimination detection method and equipment in a formation testing process, and the method comprises the steps: S1, pumping a certain volume of formation fluid at a fixed speed, expanding a flow line, enabling a pressure gauge in the flow line to be stable, and determining that an instrument seat is effective; s2, under the condition that the instrument setting is effective and the drilling fluid is isolated, continuously sucking the formation fluid in unit volume for multiple times at the pump speed from low to the pump speed, enabling the pumping flow pressure of each time to be stable, and recording the stable flow pressure and the fluid viscosity of each time; and S3, according to the steady flow pressure and the fluid viscosity of each time, whether the difference value between the formation pressure and the steady flow pressure under the current pumping condition and the next pumping condition meets a threshold value or not is calculated, and when the difference value meets the threshold value, it is represented that the overpressure is eliminated, and pumping is stopped. The problem how to eliminate the overpressure phenomenon caused by pressure rise of a near wellbore zone due to drilling fluid invasion is solved, and the balance efficiency of near wellbore pressure and formation pressure is improved.

This invention relates to an automated machining method for circular composite material covers, belonging to the field of functional composite material machining. By identifying the fiber direction through photography and combining it with C-axis positioning at the turning center, the method achieves automated machining of composite materials according to the fiber direction. Integrating an image-based dimensional measuring instrument into the production line enables rapid online full-size inspection. By using a machine tool's internal probe to pre-determine product dimensions and automatically compensate, the method automates first-piece debugging during frequent production changes. Controlling cutting forces through process methods, and precisely controlling clamping forces with small-diameter hydraulic cylinders and gauges, effectively controls the deformation of thin-walled parts. By modifying the chip conveyor to remove large particles and fibers, using multi-stage sedimentation to remove suspended particles, and employing a belt degreaser to remove lubricating oil, the method solves the problem of ensuring the composite material coolant meets emission standards. The process is automated and cost-effective.

The utility model relates to a kind of smooth recovery device of electric water level gauge measuring scale, including winding reel, ratchet wrench, support, fixed hole, screw, measuring scale outlet, measuring scale, measuring scale probe, shell.Electric water level gauge in the recovery measuring scale process will occur the condition that measuring scale is stuck in the outside of winding reel, this condition can lead to two problems of instrument abrasion aggravation and operation efficiency reduction;Using this device, it can be conveniently fixed to electric water level gauge, quickly complete electric water level gauge wire winding work, improve hydrological observation work efficiency, it is practical equipment with remarkable effect.

The application discloses a kind of high ground stress test methods of deep-buried tunnel surrounding rock.It includes the following steps, step one: after drilling is completed, installation connection and lowering of each instrument equipment in high ground stress test device based on ultra-deep drilling are completed;Step two: pressure equipment is pressurized, high-strength liquid pressure is formed, high-strength liquid pressure reaches hole bottom piston through flexible high-strength pressure pipe, pressure gauge and built-in flexible high-strength pressure pipe;Step three: with the pressure input of pressure equipment, flexible cladding plate on both sides of piston is pressed and moves laterally, and is well cladded with drilling hole wall and gradually applies pressure to drilling hole wall;Step four: the compression deformation of drilling hole wall rock mass after being pressed is measured by micrometer;Step five: P~s characteristic curve is obtained;Step six: ground stress of drilling hole wall rock mass test point is obtained.The application has the advantages of being able to measure and determine ground stress before deep-buried underground chamber or tunnel excavation construction.

The utility model discloses a railway track inspection tester superelevation measuring unit adjusting device which comprises a tool clamp, supporting plates are symmetrically and fixedly connected to the two sides of the inner wall of the tool clamp, a fixed end round hole and an adjusting end long hole are formed in the surfaces of the two supporting plates respectively, the fixed end round hole is connected with an adjusting bottom plate through a butt-joint bolt, and the adjusting bottom plate is connected with the adjusting end long hole through a butt-joint bolt. The other end of the adjusting bottom plate is connected with the adjusting end long hole through a butt joint bolt, the adjusting bottom plate is provided with a horizontal inclination angle sensor through a connecting structure, the two sides of the inner wall of the tool clamp are in threaded connection with flat end adjusting screws, and the inner side ends of the flat end adjusting screws abut against the adjusting bottom plate. The adjusting device for the superelevation measuring unit of the railway track inspection tester can adjust the measuring plane of the tilt angle sensor to be perpendicular to the pushing direction of equipment, so that the phenomenon that a horizontal measured value is inaccurate due to inertia force when the equipment is pushed is eliminated.

The invention discloses a quantitative test method and device for meshing phase consistency of duplex planetary gears, and belongs to the technical field of precision gear detection. The method realizes high-precision measurement through an error transfer and compensation principle, and comprises the following steps of: firstly, manufacturing a reference conversion device which has the same parameter as a measured gear but is completely consistent with a theoretical phase, and measuring a tiny phase error of the reference conversion device by using a high-precision instrument to serve as a compensation value beta; then, the reference device is placed in a special measuring device, positioning is carried out through a gear tooth groove, the system reading is adjusted to be a beta value through an adjusting scale, and error calibration is completed; and finally, replacing with a duplex planetary gear to be measured, and measuring a reading change value gamma of the scale under the same condition, so that the value is the actual phase center offset of the gear pair, and quantitative evaluation is realized. The matched measuring device comprises a base platform, a central positioning bush, a small / large gear tooth groove positioning piece and a measuring module with a gauge block. According to the invention, a space angle error which is difficult to directly measure is converted into a linear dimension difference which is easy to measure, the industrial problem that the phase consistency of the duplex planetary gear cannot be accurately and quantitatively detected is solved, and the method has the advantages of advanced measurement principle, high precision and simplicity and convenience in operation.

The invention provides a level gauge for constructional engineering surveying, which belongs to the technical field of constructional engineering and comprises a mounting mechanism, a level gauge body, a vertical adjusting mechanism and a horizontal adjusting mechanism, the mounting mechanism is provided with a supporting piece, and the supporting piece is provided with a control cavity; the level gauge body is mounted on the mounting mechanism; the vertical adjusting mechanism comprises two adjusting plates and two limiting pieces, and the adjusting plates are provided with long-strip-shaped holes of arc-shaped structures. The limiting piece is connected with the supporting piece and is in sliding connection with the long-strip-shaped hole. The horizontal adjusting mechanism comprises a transmission assembly and two adjusting assemblies. The transmission assembly is arranged in the control cavity, and the level gauge body is arranged on the transmission assembly; the two adjusting assemblies are arranged on the two limiting pieces and are in transmission connection with the transmission assembly. According to the leveling instrument body provided by the invention, the angle of the leveling instrument body in the vertical direction is adjusted by moving the limiting piece in the long-strip hole of the arc-shaped structure, and the angle of the leveling instrument body in the horizontal direction is adjusted by utilizing the adjusting assembly and the transmission assembly, so that the adjusting efficiency is improved.

This invention discloses a method for improving the rolling stability of thin-gauge strips in a continuous casting and rolling production line. The method includes a thin slab rolling mill; adjusting the mill rigidity; adjusting the thickness of the intermediate strip slab; installing a width measuring instrument at the exit of the fan-shaped section of the slab; continuously comparing the measured value with the actual value; replacing the actual measured value with a preset width value when the deviation obtained from the comparison does not meet the constraint conditions; reducing the downward pressure of the roughing mill to a preset percentage of the original downward pressure; adjusting the looper tension to a preset value; and after the strip is threaded at the tail end, the mill accelerates in segments according to a preset strategy with delay time intervals based on a delayed acceleration command. This effectively reduces the occurrence of issues such as strip deviation, steel accumulation, poor coil shape, tailing, and rolling damage during the production of thin-gauge strips.

The invention discloses a full-automatic grating type length measuring instrument for detecting the inner diameter and the outer diameter of a high-precision thin-wall part and a measuring method thereof, and belongs to the technical field of precision measuring instruments. The full-automatic grating type length measuring instrument comprises a measuring head and a measuring arm, and the output end of the measuring arm is connected with the measuring head through a rotating disc; the output end of the measuring arm is also provided with a driving mechanism for driving the measuring head to rotate; one end of a short arm side is connected with the internal measuring body, and one end of a long arm side is connected with the external measuring body; the long arm side middle of the main body is connected with a measuring arm; and the internal measuring body extends into the workpiece to be measured. The internal measuring unit is matched with the external measuring body to measure the inner diameter and the wall thickness of the measured workpiece, so that the inner diameter and the outer diameter of the measured workpiece are obtained; the device can be applied to detection and calibration of inner and outer diameters of high gauge blocks, gauges, ultrahigh-precision workpieces and high-precision thin-wall parts, perfects tool clamps corresponding to detected measuring tools and gauges, and has the advantages of being accurate in measured data, high in automation degree and wide in application range.

The invention discloses an underground complex stress test method, and mainly solves the technical problem of uncertainty of a test result due to the fact that complex stress cannot be completely avoided when an underground stress test is carried out in the prior art. The method comprises the following steps: preparing a protolith sample which is the same as a to-be-measured geomedium, and then installing three stress meters in the protolith sample to obtain a test sample; calibrating the test sample through a quasi-static calibration experiment to obtain a static coefficient matrix of the test sample; calibrating the test sample through a dynamic calibration experiment to obtain a dynamic coefficient matrix of the test sample; placing the test sample in a to-be-tested geomedium, and acquiring and outputting an actually measured stress matrix of the three stress meters through a data acquisition instrument; and calculating the actually measured stress matrix in combination with a calibration result to obtain a real stress matrix of the to-be-measured geomedium loaded on the test sample, thereby completing the test of the underground complex stress. The method can improve the accuracy of stress testing.

The utility model relates to the technical field of measuring tools, in particular to a convenient handheld seamless steel tube outer diameter comprehensive measuring tool. The device comprises a fixing frame, supporting rods are symmetrically arranged on the inner walls of the two sides of the fixing frame, a supporting wheel is arranged at the top of each supporting rod, a pair of sliding sleeves are symmetrically arranged at the top of the fixing frame, a measuring auxiliary assembly is movably arranged at the top of the fixing frame, and a detachable acrylic transparent plate is arranged on the measuring auxiliary assembly. A stable supporting structure is provided for the device through the supporting rods on the inner walls of the two sides of the fixing frame and the top riding wheels, it is ensured that the device cannot shake or deviate in the measuring process, meanwhile, the bottom of the bolt is tightly attached to the top of the outer wall of the seamless steel pipe all the time under the continuous action of the extrusion spring, and even if the surface of the steel pipe is uneven, the device cannot be damaged. And the continuity and the accuracy of measurement can be ensured, and measurement errors caused by untight attachment are avoided.

The utility model belongs to the technical field of measuring instrument, disclose a kind of adjustable digital elevator rail gauge, including main beam and the measuring head of assembly in the both ends of main beam, electronic distance measuring device and the locking device for holding elevator guide rail are assembled on the measuring head;The electronic distance measuring device includes the electronic distance measuring instrument towards calibration sample line, and the main control unit of electronic distance measuring instrument electricity is connected and the display of main control unit electricity is connected.