441results about How to "Simple test operation" patented technology

The invention discloses a system for kinetic model test of the ballastless track subgrade of a high-speed railway. The system comprises a model test box, a model of the ballastless track subgrade of the high-speed railway, an excitation system and a monitoring system, wherein the model of the ballastless track subgrade of the high-speed railway is formed by the foundation, a foundation bed bottom layer, a foundation bed surface layer, a concrete base, CA (cement asphalt) mortar, a track plate, a fastener system and a steel rail in sequence; the excitation system comprises a series of vibration exciters; simulation of train loads at different running speeds is realized by cooperatively controlling the vibration excitation frequency and phase of each vibration exciter; and dynamic earth pressure sensors and layered settlement gauges are arranged in the model of the subgrade, steel strain gauges are embedded in the concrete base and displacement and acceleration sensors are arranged on the track structure to jointly form the monitoring system of the system. The system can be used for carrying out study on the kinetic model test of the subgrade under the running load of the train and can evaluate and predict different foundation conditions, subgrade structures and track irregularity.

The invention discloses a transparent soil model test device for mining area pile foundation bearing force. The transparent soil model test device comprises a base, a sand box, a transparent soil model box, an electronic scale, a pile body, a loading device, a CCD industrial camera and a laser linear generator. The sand box is arranged on the base. An open hole is formed in the bottom of the sand box. The electronic scale is arranged below the open hole and used for measuring the weight of outflow sand. The transparent soil model box is embedded in the upper portion of the sand box. The bottom face of the transparent soil box is a layer of emulsion film and used for isolating transparent soil from sand soil. The pile body is arranged in the transparent soil. A pile cap is arranged at the pile top. The load is applied to the pile cap. The pile body is provided with marking points for monitoring displacement of the pile body. The laser linear generator is arranged on one side of the test device. By the adoption of the transparent soil model test device, mining subsidence caused by coal mining is simulated through a sand leakage method, so that the mining area earth surface soil mass subsidence process is simulated; and meanwhile, the method can be used for earth surface soil mass horizontal movement or vertical movement caused by similar human engineering activities by changing the sand leakage position and the pore size.

The invention discloses a dynamic air tightness test method of a dry cooling entire system. The dynamic air tightness test method is performed in the following procedures that: the valve of the dry cooling entire system is closed; each natural weep point of the dry cooling entire system is sealed off; a pressure meter is installed on a pipeline of an air outtake of a circular fan; the running of the circular fan is started, the rotating speed of the circular fan is adjusted and plugboard valves on two sides of an air suction opening of the circular fan are turned on in sequence to keep the pressure of the dry cooling entire system in a specific range; a foaming agent is sprayed on the welding line and the flange connecting point of the dry cooling entire system, and if any leakage happens, the mark is labeled; for the flange leakage, the flange connecting bolt can be fixed through spinning, and for the welding line leakage, the treatment is taken after the fan is turned off; after the leakage treatment is finished, the circular fan is turned on again to take an inspection, and circled until no leakage happens. The dynamic air tightness test method of the invention has simple operation, takes short time, saves a large mount of labor force and resources, reduces the construction cost, and improves the construction efficiency.

A test strip detection system, comprising a test strip card (1) and a detection device (2); the test strip card (1) comprises a card box (16), a built-in test strip (15) and an electronic label (20) matched with the built-in test strip (15); the electronic label (20) stores parameters such as the standard working curve of an object to be detected and the like; the detection device (2) comprises an optical system (3), a photoelectric detector (4), an analog / digital converter (5), a data processing device (6), an electronic label read-write module (10) with an aerial (11), a voice module (34), a cell box (7) and an output display device (8). The system further comprises a wireless communication module (12) and a wireless network system (13) connected with the wireless communication module (12) and comprising a remote server (14). The data processing device (6) calculates a sample detection result according to the characteristic frequency optical signals transmitted by a test strip detection band (27) and a quality control band (28) in combination with an electronic label (20) transmission parameter; the detection result is displayed on the output display device (8); the voice module (34) vocally prompts the detection result at the same time; the detection result is transmitted to the remote server (14) via the wireless communication module (12) for data management and information feedback.

The invention discloses a method for testing interface bond behavior of CFRP (carbon fiber reinforced polymer) cloth-concrete based on a beam specimen. The method comprises three steps of preparing a test specimen, arranging a test point and loading a test. The test specimen manufactured in the first step is the beam specimen and comprise two concrete test blocks, which are arranged at left and right and symmetric in shape; the two concrete test blocks are inverted T-shaped concrete test blocks; the upper parts in the middle of the two concrete test blocks are connected by a steel hinge; the steel hinge is divided into left and right halves; and the left and right halves are respectively adhered to the concrete test block at the corresponding side, and have the rotation ability. Compared with the traditional double shear test method for testing the interface bond behavior of the CFRP cloth-concrete, the effect of asymmetric loading on the data reliability is avoided; the method has a unique advantage of high accuracy of the test result; and the accuracy and the creditability of the detection result are improved.

The invention discloses a preparation method for a railway road bed large-week acceleration loading physical model test device. According to the method, the device is adjusted by constructing a model test box, a high-speed railway ballastless track road bed model, a monitoring system and an exciting system through analysis of a load bearing ratio test result, and a continuous steel rail is cut into fragmental steel rails, so that a stress state of a sub-rail structure is close to a state of running of a real train. Due to cooperative work of vibration exciters in the exciting system, a value model is used for calculating a load time-history result serving as an input load, so that running states of the real train at different speeds can be simulated. The device prepared by the method can be used for short-time and long-time test research on long-time dynamic performance of traffic basic facilities.

The invention provides a double-strap-down inertial set orientation deviation calibration device of a rocket launcher. A double-strap-down inertial set of the rocket launcher comprises two strap-down inertial sets which are installed on one integrated support in parallel so that a complete strap-down inertial set can be formed; the two strap-down inertial sets are movably placed on a horizontal flat plate calibration table; a standard hexahedron and right-angle prisms of the two strap-down inertial sets are arranged at equal height; the standard hexahedron and the strap-down inertial sets are alternately located in the view fields of a first theodolite and a second theodolite as a whole; the first theodolite and the second theodolite are arranged on the two sides of the flat plate calibration table respectively. Meanwhile, a calibration method of the calibration device is provided. The calibration device and the calibration method of the calibration device achieve the purpose that after double-strap-down inertial measurement combination main and salve redundancy is adopted for a control system of the rocket launcher, the orientation deviation of the two strap-down inertial sets is determined. After the main strap-down inertial set is aimed at at the initial orientation in front of the rocket launcher, the orientation of the slave strap-down inertial set is determined through the calibration deviation, the initial alignment and launching process of the rocket launcher provided with the redundant strap-down inertial sets can be simplified, and engineering practicability is high.

The invention discloses a load spectrum testing method for a hydraulic excavator working device. The load spectrum testing method comprises the following steps of (a) respectively arranging strain foils on piston rods of a movable arm hydraulic cylinder and a scraper pan hydraulic cylinder; (b) locking the movable arm hydraulic cylinder and a scraper pan rod hydraulic cylinder, only enabling the piston rod of the scraper pan hydraulic cylinder to flex so as to push a scraper pan to execute an excavation operation, and respectively testing strain-time response data of the piston rods of the movable arm hydraulic cylinder and the scraper pan hydraulic cylinder in the respective rod length directions under the conditions; and (c) obtaining a stress response spectrum of excavator scraper pan teeth and taking the stress response spectrum as the load spectrum of the working device by utilizing the tested strain-time response data. The invention further discloses a stress response spectrum simplification operation formula constructed based on stress analysis; according to the load spectrum testing method for the hydraulic excavator working device, which is disclosed by the invention, the load spectrum test process of the excavator working device can be realized by a simple, quick and easy-to-operate manner, the tested load spectrum can be applied to the life evaluation, and the effective evidence can be provided for the structure optimization design of hydraulic excavator working device.

The invention provides a semi-physical simulation test method, device and system, and relates to the technical field of data simulation. The semi-physical simulation test method comprises the steps ofreceiving a test item selected by a user, wherein the test item is associated with a test item identifier; calling a test program in a test tool kit corresponding to the test item identifier, and generating and sending a test instruction to the corresponding controller, so that the controller sends an execution instruction to the data acquisition equipment; calling motion parameters sent by the data acquisition equipment from a server according to the test item identifier, wherein the data acquisition equipment comprises a lower computer loaded with a real-time simulation model; calling an evaluation program in a test tool kit corresponding to the test project identifier, analyzing and calculating the motion parameters, and acquiring a test result. According to the technical scheme provided by the embodiment of the invention, various functions can be tested on the same semi-physical simulation test platform. The expandability is high, the test operation is simple, and the use is convenient.

The invention relates to a distribution network cable fault on-line distance measuring equipment and a distance measuring method. The output / input end of a current sensor of which the working band is 3MHz, is connected with the output / input end of a signal detection circuit; the output / input end of the signal detection circuit is connected with a 100MHz A / D conversion module; the 100MHz A / D conversion module is connected with the signal output / input end of an HFBR series fiber optic transceiver; the signal output / input end of the HFBR series fiber optic transceiver is connected with a cushion circuit; and the cushion circuit is connected with a host computer. The hybrid photoelectric current sensor can be used for conveniently acquiring fault transient signals of high-tension cables and any other power supply cables. The traveling wave method of fault transient signals is used for measuring the fault distance of high resistance, low resistance, periodic and flashover fault and any other faults. Since the invention can be used for identifying the cable initial fault and measuring the fault position under the conditions of power supply, people can repair and maintain the cable in advance, thereby obviously reducing economic loss due to power cut.

The invention provides a device and a method for testing the electric conductivity of a powder material and the impedance of a membrane electrode, which can meet two measurement modes: a powder material electric conductivity measurement mode and a membrane electrode impedance measurement mode. The powder material electric conductivity measurement mode comprises the steps of putting a testing sample of prepared powder press cake in a sample testing cell, testing by using an assembled die, obtaining the total impedance and electron impedance of powder respectively, obtaining proton impedance by combining an impedance parallel-connection formula and calculating to obtain electron conductivity, proton conductivity and total conductivity; and the membrane electrode impedance measurement mode comprises the steps of putting a testing sample of the prepared membrane electrode in the sample testing cell, testing by using the assembled die and obtaining the impedance of a membrane electrode. The testing device is provided with a temperature control sleeve and a humidifying pipeline, so that the electric conductivity of the powder material and the impedance of the membrane electrode under different temperature and humidity can be tested. The testing device is simple in equipment, easy to operate and precise in measurement result; meanwhile, the testing device is applicable for testing the electric conductivity of a mixed charged powder material and the impedance of the membrane electrode in a simulative PEM (Polymer Electrolyte Membrane) electrolytic tank environment; and therefore, the feasibility, the necessity and the importance of the device are further highlighted.

The invention discloses an antibacterial hydrogel dressing containing imidazolium bromide and a preparation method and application of the antibacterial hydrogel dressing. Antibacterial components, acrylamide and an initiator are composited to form a linear polymer; then the linear polymer is evenly dispersed into a gel carrier system with good biocompatibility; and through heating at the appropriate temperature and the repeated freezing-unfreezing process, the antibacterial hydrogel dressing containing the imidazolium bromide is prepared. The antibacterial hydrogel dressing has a unique three-dimensional network structure with the large water content, the antibacterial effective components and matrix macromolecules can be tightly combined together through chemical bonds, and the situationthat due to component losing, pollution to the surrounding environment is caused, or harm to body health is caused is avoided; and the hydrogel dressing has the good biocompatibility, antibacterial property, mechanical property and environmental friendliness, and will have the very wide application prospects in the field of biological dressings and medical dressings.

The invention provides a method for testing electrical conductivity of powdered material, comprising the following steps: the powdered material is laminated to be platy, and then metal powder is pressed and covered at two sides of the platy powder material, an electronic resistance is tested by a direct-current shunting method, and the electronic conductivity of the powered material is calculatedaccording to the electrical conductivity formula that rho is equal to D / ReS; the electrical conductivity of metal powder is more than 1*10<0>S / cm, wherein the rho is the electronic conductivity, D issheeting thickness, Re is electronic resistance and S is sheeting area. The method provided by the invention can further test the ionic conductivity of the powdered material and calculate the diffusion coefficient of the powdered material. The method for testing electrical conductivity of powdered material has simple testing process and is easy to know, and the cost is low and the test result is accurate.

The invention discloses a method and an apparatus for simultaneous determination of post-buckling deformation parameters and elastic moduli of an elastomeric material. The method is as follows: a PLC controller controls a linear stepping motor through a driver, a movable supporting baffle plate is pushed by the linear stepping motor so as to allow a sample to undergo post-buckling deformation, a scanner acquires a post-buckling deformation image of the sample and transfers the image to a notebook computer, and image processing analysis software is used to process the sample so as to obtain the skeleton of the post-buckling deformation image; a coordinate of a point at a leftmost end of the sample and a coordinate of a point at a rightmost end of the sample are determined according to the skeleton of the post-buckling deformation image, a coordinate of the midpoint of chord length between the leftmost end point coordinate and the rightmost end point coordinate is calculated, and then flexibility of the midpoint, corners at the ends and elastic moduli are calculated. According to the invention, synchronous determination of the elastic moduli in a pressure bar post-buckling method and the post-buckling deformation parameters of the pressure bar are realized, which enables the processes of determination and calculation of the elastic moduli to be simplified; test operation is simple, determination precision is improved, and miniaturization, intelligentization and automation of the apparatus are realized.

The invention discloses a test piece component and a test method of a brittle material I-III mixed mode fracture toughness test. The test component comprises a test piece body with a grooving and column bars for supporting and pressing the test piece body, the test piece body is a plate with square and flat surfaces, the grooving passes through the center of the test piece body plate surface, the groove surface of the grooving is parallel to the left and right side surface of the test piece body, and the grooving penetrates the front and back side of the test piece body; the column bars comprise two supporting column bars which are between the plate surface where the test piece body grooving is positioned and a universal testing machine workbench as well as a pressing column bar which is positioned between the other side plate surface of the test piece body and a universal testing machine work head, the supporting column bars and the pressing column bar are column bars with the same structure, and at least one side of each column bar is a straight arc column surface, wherein the surface and the test piece body plate surface form a line contact. During test, the universal testing machine carries out loading by the pressing column bar and the supporting column bars for the test piece body in a displacement control mode till the test piece is failure.

The present invention discloses a test method for a remote control server cold reboot and relates to a server restart testing technology. A linux operating system is installed on a control terminal, the linux operating system or a windows operating system is installed on a controlled terminal, and all servers are communicated mutually by means of a switch; and the control terminal sends a shutdown instruction to the controlled terminal by means of BMC and resends a startup instruction to the controlled terminal after the controlled terminal is shut down, a controlled terminal cold reboot test is repeatedly and circularly performed, and meanwhile, the control terminal records a controlled terminal cold reboot test result. According to the present invention, an effect of simultaneously performing massive server cold reboot tests by remote control is implemented; the test result is visual and easy to analyze; labor and time needed by the test are greatly saved; test quality and efficiency are improved; and the method has good popularization and generalization performance.

The invention discloses a method for constructing fixed-point integrated exogenous DNA transgenic pigs. The method comprises the following steps: S1, performing safety target screening and target binding gRNA cleavage efficiency verification; S2, constructing a homologous arm donor plasmid and obtaining a fixed-point integrated transgenic cell line; S3, constructing the fixed-point integrated exogenous DNA transgenic pigs. The method disclosed by the invention has the benefits that a gRNA target sequence is introduced in the donor plasmid, the donor plasmid is linearized while a Cas9 nucleasecleavage target gene is induced by utilizing intracellular transcription gRNA, the test steps are significantly simplified, the labor is saved, and the co-transfection efficiency is favorably improved; carriers used for the fixed-point integration are less, a homologous arm is moderate in size, and the transgenic cell line is more favorably obtained; an efficient site-directed integration technology, a high-activity site-specific transgenic cell culture technology and a somatic cell cloning technology are combined, so that the efficient preparation of fixed-point integrated transgenic animalsis facilitated, and the breeding speed of new transgenic animal varieties is accelerated.

The invention discloses a method for measuring the fracture toughness J<IC> of each micro area of a heat affected zone of a welded joint, which is applicable to measurement on fracture toughness of various welded joints. According to the method, by forming a V-shaped groove in a coarse grain zone or a fine grain zone in the welded heat affected zone on a three-point bending test sample, the direction of crack development is effectively controlled to ensure the crack development in the coarse grain zone or the fine grain zone in the heat affected zone, and thus the fracture toughness of the different micro areas in the heat affected zone of the welded joint can be measured. The method is simple, is low in cost, ensures real and reliable measurement results, and has great significance for evaluating the mechanical property of each micro area of the welding joint, confirming a weak section of the welded joint and studying the fracture toughness of the heat affected zone of the welded joint.

The invention provides a test apparatus for ultraviolet aging acceleration of asphalt-based materials and relates to a test apparatus. The invention solves the problems of tedious operation steps, uneven specimen aging, large thermal aging interference, failure in precise temperature control and accurate quantitative analysis of UV radiation energy in an asphalt specimen aging test. A complex rotating disk is set in an environment; complex rotating disk comprises a main rotating disk; at least one ultraviolet light source is disposed above the main rotating disk; the bottom of the main rotating disk is secured to one end of a drive shaft, and the other end drive shaft of the is connected to the output shaft of a drive motor; multiple asphalt specimens are placed on the main rotating disk; an ultraviolet probe of an ultraviolet radiation meter is arranged on the main rotating disk; the reading unit of the ultraviolet radiation meter is disposed outside the environment box; a temperature sensor is located in the environment and close to the main rotating disk; and a data acquisition and control system is set outside the environment box and is electrically connected to the temperature sensor. The invention is used for material ageing test.

The invention discloses a sand control screen sand-blocking precision detecting device and a detecting method. The sand control screen sand-blocking precision detecting device comprises an autoclave body, a distribution net pipe, and a stirring assembly, wherein a sand adding port is formed in the upper end of the autoclave body, a liquid outlet is formed in the lower end of the autoclave body, a plurality of liquid inlet holes are formed in the side wall of the autoclave body, a sand control screen sample is contained in the autoclave body, the sand control screen sample is provided with a liquid outlet channel, and the liquid outlet channel is opposite to the liquid outlet; the distribution net pipe is located in the autoclave body and sleeved outside the sand control screen sample, an annular space is formed between the distribution net pipe and the sand control screen sample, and sand grains are poured into the annular space; and the stirring assembly is located in the autoclave body and comprises a plurality of stirring paddles, the plurality of stirring paddles are located in the annular space and rotate around the peripheral circumferential direction of the sand control screen pipe. The sand control screen sand-blocking precision detecting device and the detecting method can truly and reliably detect the sand-blocking precision of a sand control screen, and are good in repeatability.

The invention discloses a method for quickly and sensitively detecting pesticide residues on surfaces of fruits and vegetables. With an ion mobility spectrometry technology as a basic detection technology, a quick qualitative and semi-quantitative analysis method for detecting pesticide residues based on an ion mobility spectrometry is established by a positive ion and negative ion mode. The method comprises the following steps: baking sampled sheets containing different pesticide samples for drying solvents, and then, conveying the sampled sheets into an ion mobility spectrometry thermal analysis sample injector to detect and analyze the sampled sheets to obtain detection signals, and performing qualitative and semi-quantitative analysis according to sample peak migration time and signal strength. Limit of detection of pesticide standard measurement can be less than 1ng. The measurement method is simple, convenient, quick, efficient and highly reliable, and can be widely used for analyzing pesticide residues on surfaces of fruits and vegetables in the food safety field.

The invention relates to a device and a method for measuring the I-type creep fracture toughness and the fracture toughness of rock. A rock single axle tensile creep fracture test and a conventional fracture test are carried out on the device for measuring the I-type creep fracture toughness and the fracture toughness of rock, thus the I-type creep fracture toughness and the fracture toughness of rock are measured. The measuring method comprises the steps of: transferring a pressure applied by the exterior into a tensile force of the interior of a rock test piece so as to realize the single axle tension of the rock test piece. The invention enables the operation of the indoor measuring method of rock fracture toughness to be simpler, guarantees the accuracy of the measured data of the test and has rather high precision, therefore having excellent using and popularizing values.

The invention discloses a multifunctional material electromagnetic parameter test system. The multifunctional material electromagnetic parameter test system comprises a base, an arched frame, an operating platform and an auxiliary sliding rail, wherein the arched frame, the operating platform and the auxiliary sliding rail are respectively fixed on the base; the auxiliary sliding rail is of a circular arc shape, the auxiliary sliding rail and the arched frame are positioned in the same plane, and the center of the auxiliary sliding rail and the center of an arc part of the arched frame are coincided; the operating platform is provided with a transmission hole, and the center point of the transmission hole and the center of the auxiliary sliding rail are coincided; the operating platform is horizontally arranged and is fixedly connected with the vase through vertical plates arranged on the two sides of the operating platform; each of the arched frame and the auxiliary sliding rail is provided with a signal antenna which is connected in a sliding manner, and the signal antennae are used for emitting or receiving the signals. In a multifunctional material electromagnetic parameter test method based on the test system, the relative positions of the arched frame and the auxiliary sliding rail is regulated according to different test parameters; due to the arrangement of the operating platform and the installation of a standard metal plate or a test material on the vertical plates, emitted signals and received signals of the signal antennae are utilized to obtain the test parameters; in addition, electromagnetic parameters for testing a testing material include a transmissivity / or reflectivity and / or space electromagnetic parameter.

The invention provides a physical simulation test method, device and system and relates to the technical field of data simulation. The physical simulation test method comprises the following steps: receiving a test item selected by a user, wherein the test item is associated with test item identification; calling a test program in a test toolkit corresponding to the test item identification, and generating and sending a test instruction to a corresponding controller to enable the controller to send an execution instruction to a servo driver; calling motion parameters sent by each sensor corresponding to a robot driven by the servo driver from the server according to the test item identification; and calling an evaluation program in the test toolkit corresponding to the test item identification and carrying out analysis and calculation on the motion parameters to obtain a test result. According to the technical scheme, the physical simulation test method, device and system can carry outtest of a plurality of functions on the same physical simulation test platform, and are high in expandability, simple in test operation and convenient to use.

The invention relates to a method and a device for testing the bonding strength of an anchoring interface of an anchoring system, and belongs to the technical field of geotechnical engineering. The method comprises the following steps: manufacturing an anchoring sample, drilling an anchor rod drill hole in a central axis of the anchor sample, placing an anchor rod in the anchor rod drill hole, and pouring an anchoring agent into the anchor rod drill hole to manufacture a test sample; after the anchoring agent is solidified, placing the test sample in a limiting device, and making the anchor rod penetrate through a limiting hole; when the bonding strength of a first anchoring interface is tested, screwing a limiting plug into the limiting hole, and tightly sticking the limiting plug and the test sample; when the bonding strength of a second anchoring interface is tested, mounting a pull bearing tray on an internal extension section of the anchor rod, and tightly sticking the pull bearing tray and the anchoring agent; applying a pulling force to the anchor rod, and recording the pulling force and a pulling displacement in real time; analyzing test data, calculating the bonding strength of the anchoring interface according to a formula, and drawing a test curve.

The invention discloses a braking jitter evaluation testing method for a motor vehicle, and the method comprises the steps: 1), increasing the speed of a vehicle to a first speed, and then decreasing the speed of the vehicle to a second speed in a state of engine jointing without a brake; 2), increasing the speed of the vehicle to a third speed from the second speed, and decreasing the speed of the vehicle to a fourth speed in the state of engine jointing through the brake, wherein the third speed is less than the first speed, and the fourth speed is less than the second speed; 3), increasing the speed of the vehicle to the third speed from the fourth speed, and then decreasing the speed of the vehicle to the fourth speed in the mode same as the mode at step 2), and repeatedly carrying out the braking process. The vehicle is provided with a plurality of sensors, and the sensors at least respectively record the speed, deceleration, temperature and acceleration signals of the vehicle at steps 1)-3), and carry out the processing of the signals.

The invention relates to a material hardness detection instrument, and in particular relates to a portable digital display hardness measuring device. The portable digital display hardness measuring device mainly comprises a pressure application and indentation depth measurement device consisting of a hand wheel, a rotary encoder and a micrometer screw thread pair, and further comprises a supporting seat, a force-measuring device, a pressure head, an electronic circuit board and a display, wherein the supporting seat is provided with the rotary encoder, a micrometer nut is arranged in a hole of the supporting seat, the front surface of the supporting seat is provided with a digital display, and the side surface of the supporting seat is provided with the electronic circuit board; a micrometric screw rod is arranged in the micrometer nut; a rotating shaft of the rotary encoder is connected with the micrometric screw rod and rotates along with the micrometric screw rod; the upper end of the micrometric screw rod is connected with the hand wheel, the lower end of the micrometric screw rod is connected with the force-measuring device; the lower end of the force-measuring device is connected with the pressure head; and the hand wheel, the micrometric screw rod, the force-measuring device and the pressure head are connected to each other and are concentric, and move with rotation of the hand wheel (11) in the axial direction. The portable digital display hardness measuring device is simple in structure, convenient to read, easy to operate and high in precision, and can be fixed on metal parts through a fixing device and is used for quickly detecting hardness of large parts on site.

The invention discloses an experimental method for testing the transformation relationship between the pretightening torque and the pretightening force of an anchor bolt. The experimental method comprises the following steps of: manufacturing an anchoring body sample which is formed by a concrete sample, an anchor bolt and an anchoring agent; mounting a backing plate and a locking nut on the anchor bolt in order after the anchoring agent is completely solidified; using a torque wrench to apply the pretightening torque on the locking nut, and reading the strain of a strain gauge after the reading on a strain indicator becomes stable; increasing the value of the pretightening torque to obtain strains corresponding to many groups of different pretightening torques; according to experimental data, drawing a test curve and analyzing the test law. The invention has important significance for understanding the relationship and the transformation law between the pretightening torque and the pretightening force of an anchor bolt and guiding the practice of anchoring engineering.