171 results about "Micrometer scale" patented technology

The invention relates to a digital inside micrometer for aircraft reaming measurement, and belongs to the technical field of aircraft assembly detection. By investigating and analyzing an existing detection method and an existing detection tool, in actual work, the measurement workload is large, the measurement efficiency is low, the perpendicularity measured by the tool cannot be guaranteed, the influence of factors such as subjective judgment and an operation method is large, and due to the adverse factors, the production efficiency is low, and the measurement error of the reaming hole diameter is likely to be caused. In the product assembling process, an inspector adopts the intelligent measuring device to implement the novel measuring method, and the intelligent measuring device is widely applied to measurement of reamed holes of airplane parts and assembly parts and realizes high-efficiency and high-precision measurement of the quality of the reamed holes of the airplane.

Devices and methods for driving a micrometer are provided. The device includes a body, a collet, a motor, and a controller. The body is configured to be coupled to a frame of the micrometer. The collet is configured to be coupled to a ratchet of the micrometer and to rotate the ratchet. The motor is coupled to the collet and rotates the collet to rotate the ratchet. The controller controls operation of the motor.

The invention is suitable for the technical field of additive manufacturing, and provides a multi-laser power monitoring method for the field of additive manufacturing, which comprises the following steps: power calibration in a non-processing state, periodic monitoring in a printing process and power abnormity closed-loop adjustment. In the invention, the hardware cost is obviously reduced; the maintenance cost is greatly reduced; the laser state has no interference; the material adaptability is high; the monitoring precision is high; abnormal response is timely; alignment is verified through the voltage signal amplitude, manual micrometer calibration (2 hours per time in the existing scheme) is not needed, the alignment time is shortened to 10 minutes per time, and the operation efficiency is improved by 12 times; carrying out data visualization; and the laser quantity is adaptive.

The present invention discloses a substrate structure for surface-enhanced Raman scattering at an off-site and its near-field detection method. The Raman scattering substrate structure includes a substrate and two-dimensional nanosheets assembled on the substrate by a self-assembly method. The two-dimensional nanosheets are polygon structures made of a metal material with surface plasmon characteristics and having at least a pair of parallel end faces. The thickness of the two-dimensional nanosheets is in the nanometer scale, while the side length is in the micrometer scale. When one end face of the two-dimensional nanosheet is excited by an excitation light source, a surface plasmon signal that travels along the surface of the nanosheet is formed and finally output at the other end face parallel to it. The emitted signal interacts with the analyte molecules, and Raman signals are formed at positions different from the excitation light source, thereby preventing the analyte molecules from decomposing due to the irradiation of a high-density light intensity excitation light source. At the same time, the off-site acquisition of Raman signals also avoids the interference of the excitation light source.

The invention relates to the technical field of micrometer marking, in particular to a graduated scale laser scale marking device which comprises a marking machine, a feeding mechanism is installed on the marking machine, an adjusting mechanism is installed on the feeding mechanism, a dust collection mechanism is installed on the feeding mechanism, a protection mechanism is installed on the feeding mechanism, and a locking mechanism is installed on the feeding mechanism. Through installation of the feeding mechanism, clamping and driving control over a micrometer are facilitated, then marking work is achieved, through installation of the adjusting mechanism, adjustment of the position of the feeding mechanism is facilitated, through driving of the dust collection mechanism, the dust collection mechanism abuts against the locking mechanism, the locking mechanism limits the adjusting mechanism, and through installation of the dust collection mechanism, the working efficiency is improved. Smoke and dust generated during marking are sucked away, pollution to the indoor environment is reduced, shielding protection control over the two sides of one end of the feeding mechanism is facilitated through installation of the protection mechanism, and shielding protection during marking is facilitated.

The utility model discloses a dial indicator interval calibration device, which belongs to the technical field of dial indicator calibration and comprises a testing fixture base, a micrometer support frame is arranged on one side in the testing fixture base, a micrometer body is arranged at the upper end of the micrometer support frame, an L-shaped support frame is arranged on one side of the micrometer support frame, and the L-shaped support frame is arranged on the other side of the micrometer support frame. The upper end of the L-shaped supporting frame is provided with a fixed clamping plate, one side of the fixed clamping plate is provided with a dial indicator body, fastening bolts corresponding to the L-shaped supporting frame and the micrometer supporting frame are arranged in the testing fixture base, and an adjusting clamping assembly is arranged in the L-shaped supporting frame; according to the utility model, the micrometer is in butt joint with the dial indicator, and then the dial indicator is calibrated by adjusting the micrometer, so that the reading synchronization of the micrometer and the dial indicator is ensured, the calibration convenience and accuracy of the dial indicator are ensured, the working efficiency is improved, the adjusting and clamping assembly is arranged, the dial indicator can be conveniently clamped and fixed, and the detection efficiency is improved. The working quality is ensured.

This utility model discloses a micrometer with a support mechanism, relating to the field of micrometer technology. It includes a micrometer and an auxiliary support assembly. The micrometer includes a frame, a protruding block, and a rotating groove. The auxiliary support assembly includes a concave support plate and a rotating connector. The concave support plate is symmetrically attached to both sides of the frame and the protruding block. The rotating connector is fixed to the bottom of one side of the concave support plate and is rotatably connected to the inside of the rotating groove via a rotating rod. The two concave support plates rotate and unfold around the center of the rotating connector, providing support for the placement of the micrometer. This utility model, by setting up the auxiliary support assembly, allows the micrometer to be stably placed on a workbench for use. Furthermore, when the auxiliary support assembly is folded up, it does not affect the handheld operation of the micrometer, making it easy to carry and store.

The invention discloses a motor shell wall thickness testing device and a testing method.The testing device comprises a testing table and a micrometer, one side of the testing table is fixedly connected with a stand column, the upper end of the stand column is fixedly connected with an annular sliding rail, an annular moving sliding block is installed on the annular sliding rail, a lifting plate is installed on the annular moving sliding block, and a horizontal sliding rail is arranged on the lifting plate; the horizontal sliding rail is provided with a horizontal moving sliding block, the horizontal moving sliding block is provided with a clamping groove, a micrometer frame of the micrometer is clamped into the clamping groove and fixedly connected with the horizontal moving sliding block, and two oppositely-arranged clamping plates are installed on the testing table and driven by an air cylinder to move. According to the motor shell wall thickness testing device, wall thickness testing can be conveniently carried out on motor shells of various specifications, and rapid wall thickness measurement can be carried out on different positions of the motor shells of various shapes. The difficulty of testing the wall thickness of the motor shell is reduced, the testing process is more labor-saving and rapid, and the measured data is more accurate.

A rack alignment device comprises a connecting rod, a vertical wire component, a micrometer and a prompt circuit, the vertical wire component is in insulation connection with a rack through the connecting rod, the vertical wire component keeps a state perpendicular to a horizontal plane, one end of the micrometer is assembled on the rack, and the other end of the micrometer is assembled on the rack. The other end of the micrometer extends towards the direction where the vertical wire component is located, the extending length of the connecting rod is consistent with the extending length of the connecting rod, and the vertical wire component is connected with the rack through the prompt circuit. According to the rack alignment device, when the rack is adjusted, the vertical wire guide component can be kept in a state perpendicular to the horizontal plane all the time, the leveling result is judged according to the contact condition of the micrometer and the vertical wire guide component by means of the prompt of the prompt circuit, operation is easy, skilled workers are not needed, and the leveling efficiency is high.

The utility model discloses a conductive contact signal method measuring device, which comprises a support, a magnetometer seat, a micrometer, an insulating part, a conductive part and an indicator, the magnetometer base is installed on one side of the support, one end of the micrometer is installed on the other side of the support in an insulating mode through the insulating part, the other end of the micrometer is an adjustable telescopic end, the conductive part is in contact connection with the micrometer and is separated from the support through the insulating part, and the indicator is electrically connected with the conductive part through a wire. The device can complete measurement only through single-person single-hand operation, and is simple in adjustment and high in measurement precision.

The invention discloses a calibration device and method for calibrating the parallelism of a measuring surface of a large outside micrometer. The device comprises a mechanical adjustment module, an optical imaging module and an image processing and calculating module, the mechanical adjusting module is used for adjusting the position of the micrometer; the optical imaging module comprises an autocollimator and a double-turning prism system, a high-resolution area array detector is arranged in the autocollimator, the double-turning prism system divides a single-path collimated light beam emitted by the autocollimator into two paths, the two paths of collimated light beams are respectively projected to two measuring surfaces of a micrometer and receive reflected light of the two paths of collimated light beams, and two independent cross images are formed on the detector; the image processing and calculating module displays a view field containing two cross images in real time, sets one image as a reference zero position, calculates the angle deviation of the other image relative to the reference zero position in the X direction and the Y direction, and converts the angle deviation into a linear parallelism deviation value. The method can realize non-contact, automatic and visual calibration in the whole process, and has the characteristics of high precision, high efficiency and high repeatability.

The application provides a preparation method and a centering device of a size-controllable ultrathin high-quality echo wall optical crystal microcavity, and the method comprises the following steps: cutting a crystal material into a wafer and grinding and thinning the crystal thickness by using a polishing disc; placing an optical crystal microcavity blank on a microscope stage, adjusting two-dimensional adjustment knobs of the stage, and making the center of the optical crystal microcavity blank coincide with an origin of an objective micrometer scale; making a clamping rod with an adhesive adhered to a bottom end penetrate a top end through hole of a clamping rod fixing frame, and making the clamping rod align with the origin of the objective micrometer scale; adjusting the height of the clamping rod, making the optical crystal microcavity blank be pasted and fixed on the bottom end of the clamping rod by ultraviolet curing glue, and completing centering; taking the clamping rod off the clamping rod fixing frame, chamfering an outer circle of the optical crystal microcavity blank; grinding the outer circle surface of the optical crystal microcavity wafer by using sandpaper; polishing the optical crystal microcavity wafer, and obtaining the optical crystal microcavity based on the polished optical crystal microcavity wafer.

The utility model relates to an indication error calibration device for an adjustable three-point inside micrometer, and belongs to the technical field of measurement and detection. Comprising a three-point inside micrometer (1), a gauge block (2), a bottom plate (4) and lightening holes (3), the bottom plate (4) is a square plate, an equilateral triangle groove is formed in the middle of the bottom plate (4), the three-point inside micrometer (1) is arranged in the groove, the section of the three-point inside micrometer (1) is circular, the arc surface of the three-point inside micrometer (1) is tangent to the two side edges of the equilateral triangle groove, and the gauge block (2) is arranged between the lower portion of the three-point inside micrometer (1) and the bottom edge of the equilateral triangle groove. The inner wall of the equilateral triangle groove and the gauge block (2) form a calibration point size; the bottom plate (4) is provided with a plurality of circular lightening holes (3), so that the required standard inner diameter of any specification can be combined by using the existing gauge block, and the gauge block has the effects of flexibility, convenience and simplicity in operation.

The utility model discloses a molybdenum wire diameter detection device, which relates to the technical field of molybdenum wire detection equipment and comprises a micrometer body, and a positioning assembly is arranged on one side of the micrometer body. The positioning assembly comprises a fixing ring, a mounting plate, a knob, a lead screw and two fixing clamps, the micrometer body is rotatably mounted at one end of the fixing ring, the mounting plate is fixedly mounted at the top end of the outer wall of the fixing ring, the knob is rotatably mounted at the top end of the mounting plate, and the lead screw is fixedly mounted at one end of the knob and rotatably mounted at the bottom end of the inner wall of the fixing ring; the two fixing clamps are in threaded connection with the outer wall of the screw rod; according to the technical scheme provided by the utility model, through the arrangement of the positioning assembly, when the diameter of the molybdenum wire is detected, the fixing ring can be fixed on the surface of one side of the part, needing to be detected, of the molybdenum wire, and when the micrometer body is used for detection, the micrometer body can conveniently rotate at one end of the fixing ring at will so as to replace the detected surface, and the detection efficiency is improved. And the diameter of the molybdenum wire can be detected more conveniently.

The present application provides an intelligent measurement method for the outer diameter of a cylinder based on a three-jaw micrometer, and relates to the field of intelligent measurement technology. By acquiring basic information of a target cylindrical part and a three-jaw micrometer, a three-dimensional simulated target is constructed for test analysis, strong limit data is set based on contact pressure damage and a limiter is configured, and a position constraint function is set based on the relative position of the contact and an automatic adjustment module is trained; a monitoring device is arranged in the measurement space of the target cylindrical part; real-time measurement data is acquired, and data analysis and adjustment decisions are performed in combination with the automatic adjustment module, and limit adjustment based on the limiter is performed, and measurement parameter control adjustment is performed on the three-jaw micrometer; parallel measurement of multiple spatial positions is performed, and the outer diameter measurement result is calculated based on the first measurement data and the parallel measurement data. The present application solves the technical problem that the traditional measurement method cannot accurately control the measurement parameters, resulting in limited measurement accuracy and consistency, and improves the accuracy and reliability of the measurement results.

The invention discloses a photoacoustic detection imaging system and method based on optical waveguide resonance sensing. The imaging system comprises a detection light source, a polarization assembly, a first focusing lens, a prism, an objective lens, a sensor, a spectroscope, a first polarization detection assembly, a second polarization detection assembly, a photoelectric detector, an exciting light source, a lens assembly, a first reflector, a second focusing lens, a second reflector, a two-dimensional mobile platform and an imaging processing terminal. The sensor is an optical waveguide resonance sensor. According to the imaging system, the combination of the sensor of the tightly limited detection electric field with extremely strong optical resonance and the coupling medium is arranged, so that the imaging system has ultra-high sensitivity and large-bandwidth photoacoustic detection capability; the exciting light irradiates the sample to generate the photoacoustic signal and acts with the coupling medium to obtain the detection light beam based on the light beam change, so that the photoacoustic microscopic imaging in a reflection mode can be realized, the three-dimensional microscopic imaging in a micrometer scale can be realized regardless of the thickness of the sample, and the depth resolution and the quality of the imaged image are greatly improved.

The utility model provides a testing device and system for checking digital images of an inner helmet body, and the testing device comprises a bottom frame, a workbench and a control assembly which are disposed on the bottom frame, and two pressurization mechanisms which are disposed on the two sides of the workbench respectively and are used for pressurizing the inner helmet body. The bearing mechanism is arranged on the workbench and located between the two pressurizing mechanisms and used for bearing the inner helmet body. According to the utility model, whether the inner helmet body is qualified or not is judged through the industrial personal computer according to whether three kinds of data including data acquired by the force sensor, data acquired by the micrometer and data after photographing and analysis of the industrial camera are qualified or not, and the data acquired by the force sensor and the data acquired by the micrometer are made into an associated deformation curve to be displayed on the display. Therefore, stress deformation data can be captured and recorded immediately when the helmet body is under pressure, real-time feedback and analysis basis are provided, operation is simplified through semi-automatic testing, testing efficiency is improved, and a quantification function is achieved.

The invention discloses a high-precision straightness inspection device and method for a linear component, relates to the field of measurement of slender stepped shaft type linear components, and solves the problem of inaccurate measurement caused by gravity deformation, incapability of free rotation and inconformity with vertical use conditions in existing horizontal measurement. The device comprises a rotary measuring mechanism and a laser image projection measuring tool, the rotary measuring mechanism is composed of a segmented positioning frame, a split locking disc, a rotary workbench and the like, vertical fixation and middle section reference transfer of a linear component are achieved, and the lower section coaxiality is measured in cooperation with a depth micrometer; the laser projection device comprises a laser light source, a receiving target and a control unit and drives a component to rotate through a rotary workbench, and laser projection captures upper-section swing deviation. According to the method, straightness detection is completed through reference adjustment and segmented measurement. The method fits the actual working condition, the measurement precision of the lower section is less than or equal to 0.005 mm, the measurement precision of the upper section is less than or equal to 0.002 mm, the measurement time of a 4m part is less than or equal to 30 minutes, and the method is adaptive to phi 12-phi 30 parts and is suitable for high-precision detection of vertical linear parts.

The utility model discloses a supporting platform for a chip detection device, which comprises a base, a platform body and two micrometers, ruler frames of the two micrometers are respectively fixed at two ends of the base, the platform body is positioned above the base, two ends of the platform body are respectively and movably connected with mandrels of the two micrometers, and the two mandrels of the two micrometers are respectively and fixedly connected with the base. The table body is connected with one of the two micrometers in a sliding and rotating mode, and the table body is connected with the other one of the two micrometers in a rotating mode. According to the supporting platform for the chip detection device, the chip detection device is installed on the platform body, the installation height of the chip detection device installed on the platform body can be adjusted through the arrangement of the two micrometers located at the two ends of the platform body, operation is easy, accuracy is high, and a good chip testing effect is guaranteed.

The utility model relates to a roll gap measuring micrometer support, comprising a bottom frame comprising a first support leg and a second support leg which are erected on the peripheral side of a roller and are tangent to the roller; the mounting mechanism is arranged on the bottom frame and is used for mounting the micrometer, so that the micrometer is vertical to the peripheral side of the roller shaft; the first supporting leg and the second supporting leg are symmetrically arranged on the two sides of the mounting mechanism. When the roll gap measuring micrometer support provided by the utility model is used, the micrometer is fixed on the bottom frame through the mounting mechanism, and then the first supporting leg and the second supporting leg are placed on a roller, so that the size of a roll gap can be measured by adjusting the extension length of the micrometer until the micrometer is propped against another roller. And the measurement error caused by holding the micrometer by hand is reduced. And meanwhile, the roll gap measuring micrometer bracket is low in cost, so that the cost is reduced.

Essentially, an invention deals with a method for performing a process on a part. (P) which is made from a group of ferrous metals consisting of: The nitriding action that forms on the part(P) is a composite layer(2) of considerable thickness. Between 5 and 30 micrometers and the diffusion area (3) which is located below and Contact with the composite layer (2) with a thickness between 100 micrometers and 500 micrometers; Next, The operation of wet hardening of part (P) by induction at high frequency throughout. A deep induction hardening of 0.5 mm or more is required for this process. The part (P) and it is to make that part (P) have: Surface hardness greater than or equal to 50HRC. Hardness of the aggregate layer (2) greater than or equal to 400HV0.0s, The hardness of the part is greater than or equal to 500HV0.05 at a depth of 500. micrometer, And since the high-frequency induction hardening process is performed without... Apply a protective film to the part (P) before induction hardening. The invention also involves a part (P) which is made of ferrous metals. Significant resistance to wear by abrasion and adhesion; possesses friction properties. And it has improved scratch resistance and excellent corrosion resistance;

The invention discloses a differential eddy current displacement sensor calibration device and a calibration method thereof, and relates to the technical field of sensors, the device comprises a fixing device, a detection assembly and an adjusting device, and the adjusting device and the detection assembly are installed on the fixing device; the detection assembly comprises a first detection assembly and a second detection assembly, the first detection assembly comprises a first support and a first sensor probe, the second detection assembly comprises a second support and a second sensor probe, the first sensor probe is fixedly installed on one side of a detected object, and the movable second sensor probe is installed on the other side of the detected object. The distance between the second probe of the sensor and the measured object is controlled by adjusting the micrometer fine adjustment sliding table, so that the distance accurately reaches the zero clearance required by the calibration device, and meanwhile, the measured object is stepped by using the high-precision digital display ten-thousand-meter ruler, so that the calibration result is more accurate, and the calibration precision is improved.

1. Name of the product in this design: Grip part of a micrometer retainer. 2. Application of this design: The entirety containing the claimed partial design is used as a micrometer retainer, and the claimed partial design is used as the grip of the micrometer retainer. 3. The key design features of this product are the shape of the solid lines. 4. The image or photograph that best illustrates the design's key points: a 3D model. 5. Other situations requiring explanation: Solid lines represent the parts that require protection, dashed lines represent the parts that do not require protection, and single-dot lines represent the boundary between the parts that require protection and the parts that do not require protection.

The present invention provides a calibration device for a laser displacement sensor, which can conveniently calibrate laser parameters. The device comprises a laser calibration plate and a micrometer. The micrometer is mounted on a fixed plate. The laser calibration plate and the fixed plate are connected via an installation connection block. A micrometer head mounting plate is mounted on the laser calibration plate. A micrometer is mounted on the micrometer head mounting plate. A sleeve and a screw on the micrometer penetrate the micrometer head mounting plate together. The screw is connected to a counterweight block via a compression spring. A sliding assembly is mounted on the laser calibration plate. The sliding assembly comprises a slide rail. A slide plate is mounted on the slide rail via a slider. The slide plate is connected to the screw via a follower block. A through groove is formed on the laser calibration plate below the slide plate. The upper part of an inverted T-shaped side slide plate passes through the through groove and is connected to the bottom surface of the slide plate. The length of the through groove is greater than the length of the upper part of the side slide plate and less than the length of the lower part of the side slide plate. An optical glass is mounted on the bottom surface of the lower part of the side slide plate. The probe on the micrometer contacts the end of the optical glass after passing through the fixed plate.

The invention relates to a tool and method for measuring the diameter between pockets of an integral window type retainer, and belongs to the technical field of retainer measurement, the tool comprises a measuring platform and two sets of measuring tools, each measuring tool comprises a base, a connecting plate and a standard disc, the bearing surface of the measuring platform is in a horizontal state, and the bearing surface of the measuring platform is in a horizontal state. The base is arranged on a measuring platform, the connecting plate is fixedly arranged on the base, the standard disc is arranged on the connecting plate and located above the base, and the standard disc is used for entering a pocket and pressing a pressing slope surface of the pocket; the device further comprises a tube ruler, the tube ruler comprises a mounting rod and two micrometers arranged on the mounting rod, the mounting rod is used for being erected on the holder, the two micrometers are located on the two sides of the mounting rod, and testing needles of the micrometers are parallel to the mounting rod and used for abutting against the peripheral wall of the standard disc. The method has the advantage of improving the accuracy of measured data.

The utility model discloses an ice skate blade sharpening frame, belongs to the technical field of ice skate blade maintenance, and aims to solve the problem that the conventional ice skate blade sharpening frame cannot meet the requirement of adjusting the clamping height of an ice skate blade. Comprising a box body, a first fixing plate, a movable clamping plate and a second fixing plate are sequentially arranged from front to back, the first fixing plate and the second fixing plate are connected with the box body through a guide rail set, and the movable clamping plate is in sliding fit with the guide rail set; the first fixing plate is provided with two micrometer leveling devices, the movable clamping plate is provided with two micrometer leveling devices, and the micrometer leveling devices are the rest parts of the outer diameter micrometer without the ruler frame and the measuring anvil. And micrometric screw rods of the four micrometer leveling devices upwards face the four cracks in a one-to-one correspondence manner. According to the utility model, the alignment height of the ice skate blade is adjusted through the micrometer leveling device, the adjustment precision is high, and the two ground ice skate blades are good in levelness.

The utility model discloses a pinhole adjusting frame, include: fixed plate, adjusting plate, along the thickness direction of fixed plate floating setting in fixed plate, mount pad, activity setting in adjusting plate, and mount pad is used for installing pinhole board, a plurality of first micrometer, install in adjusting plate, and the end of first micrometer is in abutted cooperation with mount pad, so that the position of mount pad is adjusted along the length direction of fixed plate, a plurality of second micrometer, install in adjusting plate, and the end of second micrometer is in abutted cooperation with mount pad, so that the position of mount pad is adjusted along the width direction of fixed plate, a plurality of third micrometer, and third micrometer is connected to fixed plate and adjusting plate respectively, and a plurality of third micrometer cooperation, so that the position of adjusting plate is adjusted along the thickness direction of fixed plate. Realize pinhole three -dimensional high accuracy quantifiable adjustment, low in cost, easy operation, solve the low precision of manual adjustment and the difficult problem of expensive piezoelectric scheme, and it is widely applicable to industrial and laboratory scene.

The utility model discloses a soil observation micro-scale, and belongs to the technical field of soil sampling analysis. The ruler comprises a ruler body, a marking assembly and a fixing assembly, an observation groove is formed in the middle of the ruler body, and the observation groove penetrates through the ruler body and is arranged in parallel in the length direction of the ruler body; the marking assembly comprises first scales and second scales which are used for measuring the length, the first scales are arranged on the two sides of the ruler body, and the second scales are arranged on the edge, opposite to the observation groove, of the ruler body; the fixing assembly comprises at least two fixing holes, the fixing holes are formed in one end of the ruler body, and the fixing holes are used for assisting the ruler body to be fixed to the soil profile. According to the utility model, the soil sampling and analyzing process can be simplified, and a user can conveniently fix and observe the ruler body independently.

1. The name of the design product: digital micrometer. 2. The use of the design product: the design product is used for measurement. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The utility model provides a kind of concrete shrinkage test device, including support platform, the top two ends of support platform are symmetrically connected with first mounting bracket, the top of first mounting bracket is slidably connected with support seat, the top of support seat is connected with first micrometer, and slidingly connected with clamping plate between two first micrometers, first connecting rod is tightly connected on the side of clamping plate mutually far away, and first connecting rod and the detection end of first micrometer are coaxially arranged;Multiple second mounting brackets with rectangular distribution of first mounting bracket are slidably connected on support platform, second connecting rod is slidably connected on second mounting bracket, and the bottom of second connecting rod is coaxially connected with second pressing plate.The utility model can stably place concrete test block, when concrete test block changes, multiple micrometers can be monitored, and clamping plate and second mounting bracket can be synchronously slid, to improve the accuracy of detection data.