51 results about "Grinding test" patented technology

The invention belongs to the technical field of grinding test, provides a magnetic bimodal flexible monitoring device for grinding heat and grinding force and a machine tool, and solves the problem that the structure of a test system needs to be changed for measuring the grinding temperature and the grinding force in the prior art, and adopts the technical scheme that an electromagnetic workbench, a flexible magnetic bimodal sensor and a signal processing device are arranged; one side of the flexible magnetic bimodal sensor is adsorbed to the electromagnetic workbench, the other side of the flexible magnetic bimodal sensor is adsorbed to a workpiece, and the flexible magnetic bimodal sensor is connected with the data processing module; the flexible magnetic dual-mode sensor comprises a grinding temperature measuring structure and a grinding force measuring structure, and the signal processing device is configured to receive change information of resistors in the grinding temperature measuring structure and the grinding temperature measuring structure when the grinding temperature or the grinding force changes; and the corresponding grinding temperature and grinding force are calculated according to the resistance change information. The structure of the device does not need to be changed, measurement precision is considered, and stable and efficient grinding temperature and grinding force detection is achieved.

The utility model discloses a grinding type coal rock gas generating device which comprises a box body frame, and a lifting supporting unit, a grinding driving unit, an upper clamping unit, a lower clamping unit, an upper grinding convex rod, a lower grinding concave rod, a middle clamping unit, a gas collecting unit and a temperature control unit are arranged in the box body frame. The coal rock grinding device is scientific in principle, simple in structure, easy to install and good in sealing performance, coal rocks are ground in a sealed environment, meanwhile, temperature control in the grinding process is achieved, and therefore the accuracy of coal rock grinding test data is improved, gas generated in the coal rock grinding process can be collected, and the coal rock grinding efficiency is improved. Therefore, a reference basis is provided for researching the abrasiveness of the coal rock.

The invention provides a hard and brittle material subsurface damage mechanism signal classification method based on an acoustic emission technology. The method comprises the following steps: firstly, acquiring an acoustic emission original signal and surface appearance of the hard and brittle material through grinding tests at various grinding speeds; then, carrying out preprocessing and time-frequency domain feature extraction on the acoustic emission signals by using a wavelet packet signal processing algorithm and short-time Fourier transform; finally, distinguishing a micro-crack signal, a radial crack signal and a transverse crack signal from the characteristic space by combining the damage characteristics and acoustic emission characteristic parameters of the hard and brittle material, and obtaining a characteristic frequency band range corresponding to each crack damage mode; a hard and brittle material subsurface damage mechanism signal classification model is constructed, and a theoretical basis is provided for monitoring of grinding subsurface damage of hard and brittle materials under complex working conditions. According to the method, the damage mechanism of the hard and brittle material can be quickly identified, the subsequent online evaluation of the subsurface damage of the hard and brittle material is realized, and the technical problem of non-destructive accurate monitoring in the grinding process is solved.

The invention provides a method for determining the ball diameter and grading of an ore grinding medium in fine grinding operation, which adopts two or more ore grinding medium ball diameter theoretical calculation methods, and comprises the following steps: calculating the theoretical ball diameter of the ore grinding medium of each size fraction of materials to be ground, and preliminarily determining the ball diameter and ball ratio of a mill by referring to the granularity composition and mass fraction of the materials to be ground; and then verifying and optimizing through an ore grinding test, and finally determining the technical scheme of reasonable initial ball loading and accurate ball supplementing and adding of the mill. The method comprises the steps of size fraction analysis and grouping of the materials to be ground, theoretical ball diameter calculation, ore grinding test verification, determination of the initial ball loading scheme of the mill and determination of the ball supplementing and adding scheme of the mill, theoretical calculation and test verification optimization are included, the implementation method is simple, the application range is wide, and the process effect is good.

The utility model discloses a multipurpose fuel nozzle grinding test tool which comprises a quick-change connector, a nozzle, an oil supply connector, an end face grinding sleeve and a cast iron grinding platform, the quick-change connector is of a hollow structure, the nozzle is inserted into the quick-change connector and is in threaded connection with the quick-change connector, a clamping groove is machined in the upper end of the quick-change connector, and a clamping groove is formed in the lower end of the quick-change connector. The oil supply connector is clamped in a clamping groove of the quick-change connector, observation and debugging of the atomizing taper angle and flow of the nozzle can be achieved by pressurizing the oil supply connector, the quick-change connector is sleeved with the end face grinding sleeve, and a spring is arranged between the end face grinding sleeve and the quick-change connector. And the nozzle is connected with the tool and is provided with a sealed structure. The nozzle grinding tool has the advantages that the nozzle can be ground by clamping the nozzle grinding tool, the nozzle atomization taper angle and flow can be observed and debugged by pressurizing the oil supply connector, and the nozzle grinding tool is simple in structure, diversified in application scene and wide in application range.

The present invention discloses a wear resistance tester for protective gloves, comprising a test bench and a column; further comprising a first guide portion mounted on the column; a hand model assembly mounted on the first guide portion; a hand model driving device connected to the hand model assembly; a grab test device mounted on the test bench; a grinding rod assembly mounted on the test bench; a grinding rod driving device connected to the grinding rod assembly; the grinding rod assembly and the grinding rod driving device are connected to the test bench via a second guide portion. The present invention is a wear resistance tester mainly for the thenar muscle (tiger's mouth) and fingertips of protective gloves, which restores the state of actual working conditions, and the performance detection of protective gloves is closer to real data.

This invention relates to the field of building material ceramic performance testing technology, specifically a method and application for testing the wear resistance of glaze surfaces, comprising the following steps: S1, cutting out the glazed area as a sample, washing it, and drying it to constant weight; S2, pre-test photography: determining the measurement area on the sample, observing and photographing the measurement area using a microscope, and obtaining the initial dark area ratio η0 of the measurement area using image processing software; S3, grinding test; S4, sample post-treatment: after reaching the pre-adjusted rotation speed n, removing the sample, cleaning it, and drying it to constant weight; S5, post-test photography, obtaining the dark area ratio η of the measured area surface after grinding. n S6. Calculate the wear area ratio Δη of the measurement area, plot Δη against the grinding revolution number n, and take the lowest value among the grinding revolutions corresponding to the wear area ratio Δη reaching 33.3% or above as its wear resistance revolution number, so as to solve the problem that the current test of the wear resistance of glaze is difficult to quantify and has a large human error.

The invention discloses grinding wheel testing equipment, which relates to the technical field of grinding tool testing and comprises a testing table, a tool clamping device and a grinding device. When a grinding wheel grinding test is carried out, the vertical distance between the grinding wheel set and the tool clamping device is adjusted, then a workpiece to be ground is guided to the first clamping assembly through the second clamping assembly, and after the first clamping assembly clamps one side of the workpiece to be ground, the second clamping assembly tightly presses the other side of the workpiece to be ground. Then the first sliding part is driven to slide at a constant speed from one end of the test board to the other end of the test board, and the fixed workpiece to be ground is ground through a grinding wheel set rotating at a constant speed; the feeding amount of a workpiece to be ground can be adjusted by adjusting the distance between the first clamping assembly and the second clamping assembly and adjusting the vertical distance between the grinding wheel set and the tool clamping device, and different grinding working conditions can be simulated by adjusting the rotating speed of a grinding wheel and the sliding speed of a first sliding piece. Therefore, working condition simulation on a real working production line of the grinding wheel can be completed.

The application provides a high-efficiency spiral flute tap batch grinding method based on a non-dominated sorting genetic algorithm (NSGA-II), which can accurately realize tap consistency grinding and improve efficiency. First, the wear and diameter change law of a forming grinding wheel is established based on an actual grinding condition; second, a forward calculation method improved based on an engagement principle is used to calculate a tap radial flute type according to a normal section type of the grinding wheel; then, the flute type corresponding to the grinding wheel in different wear and diameter states is calculated to establish the influence law of the grinding wheel wear on the flute type; the influence law of the grinding wheel wear on the flute type is verified through a grinding test and a Canny operator visual recognition; finally, the NSGA-II algorithm is used to optimize a grinding wheel clearance angle, eccentricity and inclination angle combination, and the accuracy of the algorithm is verified through a test. The application belongs to the field of mechanical engineering.

The invention discloses a GH4169 matrix NiCrAlY coating single crystal corundum grinding wheel grinding parameter optimization method. The method comprises the following steps that S1, experimental equipment and a grinding test piece are determined; s2, determining the model and process parameters of the grinding wheel; s3.1, a dissimilar material grinding size experiment is carried out; s3.2, a grinding surface roughness test is carried out; s4, performing comprehensive analysis on an experiment result by using an orthogonal experiment method; s4.1, the range of the difference value delta is analyzed; s4.2, carrying out range analysis on the surface roughness Ra; s5, performing experimental verification and contrastive analysis before and after optimization to obtain optimal parameters: the feeding speed of the grinding wheel is 8mm / min, the rotating speed of the grinding wheel is 2500r / min, and the grinding depth is 3mu m; by establishing a white corundum / single crystal corundum contrast grinding experiment system for synchronously grinding dissimilar materials of a spraying layer and a high-temperature alloy matrix, the grinding efficiency of the single crystal corundum grinding wheel is higher, and the surface quality and the dimensional precision are higher.

The invention discloses a blade tip grinding method for a long and short composite blade, which is used for grinding a blade tip of a blade disc with a long blade and a short blade, an overlapping part exists on the blade tip of the short blade adjacent to the long blade, and the method comprises the following steps of: mounting the blade disc on a rotary table of a five-axis machine tool; an angular reference is determined through the preset line position of the index plate, and the angles of the long blades and the short blades are located; the position of the first grinding wheel is adjusted, so that the rotating center line of the first grinding wheel is parallel to the blade tip contour lines of the long blade and the short blade, and the blade tip of the long blade and the blade tip of the non-overlapped part of the short blade are sequentially ground; and finally, the second grinding wheel is used for grinding the overlapped part on the short blade. By means of the method, grinding machining of the blade tips of the blade discs of the long and short composite blades can be achieved, the machining precision is high, the strict requirement of aero-engine blades for the dimensional tolerance of the blade tips is met, a blade tip collision-grinding test is conveniently carried out, and control over the gaps between the blade tips and a cartridge receiver is facilitated.

The invention discloses an on-site nondestructive evaluation method for compressive strength of release structure concrete after impact grinding, and the method comprises the following specific steps: step 1, preparing a concrete test block, obtaining a surface model of the concrete test block, and carrying out meshing on the surface model to obtain a first meshing model; 2, the concrete test block is installed in a punching and grinding device to be subjected to a punching and grinding test, a springback test is conducted on the punching and grinding face of the concrete test block after punching and grinding, and a punching and grinding depth-springback value curve is constructed; step 3, reconstructing a punching and grinding depth-rebound value curve as a punching and grinding depth-compressive strength curve; and 4, carrying out in-situ test in the floodway, and combining with the punching and grinding depth-compressive strength curve to obtain the final compressive strength. The method provided by the invention can detect the compressive strength of the water release structure after the concrete is washed and abraded under the condition of no damage.

The application discloses a kind of based on semi-artificial thermocouple peristaltic grinding arc temperature field measurement method and system, comprising: in peristaltic grinding test piece interval arrangement several first thermocouple wires perpendicular to grinding surface and with the peristaltic grinding test piece insulation, and second thermocouple wire is arranged on the peristaltic grinding test piece position away from the first thermocouple wire, wherein, one end of several first thermocouple wire can be contacted with grinding equipment;The other end of several first thermocouple wire and the second thermocouple wire are connected to signal acquisition module respectively;Using the grinding equipment is ground to the peristaltic grinding test piece, when the grinding equipment contacts the first thermocouple wire, heat signal acquisition is carried out using the signal acquisition module.The application can accurately directly measure the internal temperature field of entire grinding arc.

The invention discloses an edge sealing strip wear resistance testing device, and belongs to the technical field of edge sealing strip testing, the edge sealing strip wear resistance testing device comprises a main body device, the main body device is used for testing the wear resistance of an edge sealing strip, the main body device is provided with a switching device and a detection device, and the detection device is used for detecting the wear condition of the edge sealing strip; the testing mechanism drives three different testing tail ends, namely a scraping wheel, a knurling wheel and a grinding wheel to rotate and move back and forth at the same time, so as to carry out wear resistance testing on the edge band under different cleaning conditions; the switching device can intermittently drive the position of the sliding frame and the position of the lower sliding frame to be exchanged, so that after the abrasion resistance test of the edge band is completed, the part, ground by the scraping wheel and the knurling wheel, of the edge band is detected through the probe, and the part, ground by the grinding wheel, of the edge band is detected through the thickness measuring mechanism; due to the fact that the scraping wheel and the knurling wheel are mainly used for scratching the surface of the edge sealing strip, the grinding wheel can grind the edge sealing strip in a thickness mode, different detection modes are adopted, the detection effect is good, and more pertinence is achieved.

The application relates to a microsphere grinding method and device based on a reverse variable-speed drive, wherein the method comprises the following steps: determining the working conditions and structural parameters of simulation and test microsphere grinding, establishing a topological model of a simulation object, and importing the topological model into a dynamics simulation software; simulation calculation is performed by using the dynamics simulation software, related data of the microspheres are obtained by comparison simulation, and whether the microsphere revolution collision phenomenon exists in the simulation result is judged; if the microsphere revolution collision phenomenon exists, a time-varying driving speed function is traced back, the time-varying driving speed function is applied to actual microsphere grinding test, finally, when the preset relatively stable revolution running conditions among the microspheres are met, a corrected time-varying function is derived, and the corrected time-varying function is applied to actual variable-speed grinding. Therefore, the problem that due to the fixed eccentricity of the grinding disc, the revolution speeds of the microspheres at different positions are different, and when multiple microspheres grind at the same time, the microspheres are prone to collision, thereby causing surface defects and size deviation and the like is solved.

The invention provides a ball mill product particle size distribution prediction method based on discrete element simulation and an overall balance model, and the method comprises the steps: obtaining feed particle size distribution and product particle size distribution data through a ball mill grinding test; calibrating exclusive crushing characteristic information through a material impact crushing test; discrete element simulation is carried out, and a steel ball collision energy distribution characteristic value is extracted; constructing a mathematical mapping model of steel ball collision energy distribution and an ore grinding rate function; generating a distribution function of an overall balance model in combination with the crushing characteristic information and the collision energy distribution characteristic value; with the purpose of minimizing the error between a product particle size distribution measured value and a predicted value, an ore grinding rate function is inversely optimized, and a mapping relation among energy distribution, feeding particle size distribution and the ore grinding rate function is established; discrete element simulation is carried out on a to-be-predicted scene, and a grinding rate function is dynamically generated through the mapping model; and inputting the feeding particle size distribution, the ore grinding rate function and the distribution function into the overall balance model, and outputting a product particle size distribution predicted value.

The invention discloses a method for determining the grindability coefficient of lignite based on grinding dynamics, comprising the following steps: 1) preparing and weighing several coal samples, each 50g±0.01g; 2) controlling the working speed of the Hastelloy grinder within the range of 20-120R, and grinding several coal samples within a specified time until the Hastelloy grinder automatically stops; 3) using a test sieve to screen the grinding product after grinding and recording the test data; 4) using the grinding dynamics formula to process the grinding test data for lignite, and obtaining the grindability coefficient K to characterize the grindability of lignite. The beneficial effects of the invention are as follows: using the Hastelloy grinder to carry out the grinding test, and obtaining the grindability coefficient k based on the grinding dynamics model as an indicator of the grinding difficulty of lignite, providing a reference for the efficient operation of the pulverizing system, and also broadening the applicable coal types of the Hastelloy measuring instrument.

The invention provides a test device and an evaluation method for the wear resistance of a steel plate. The test device comprises an object placing table, a test table and a control system, wherein the object placing table is used for placing a to-be-tested steel plate; the grinding test head is arranged above the object placing table and is used for abutting against a steel plate to be tested, so that the gravity of the grinding test head acts on the steel plate to be tested; the driving end of the driving module is connected with the grinding test head to drive the grinding test head to rub with the to-be-tested steel plate along a preset direction; the control module is in signal connection with the driving module, and the control module is used for controlling the driving module to drive the grinding test head to move in a preset direction within a preset duration; the roughness measuring instrument is used for measuring the roughness of the surface of the to-be-measured steel plate. The test device does not need to weigh the grinding part, the weight loss value in the unit area is calculated according to the measured roughness of the abraded area and the unabraded area, then the wear resistance is evaluated according to the weight loss value in the unit area of the steel plate to be tested, and then the accuracy of wear resistance evaluation is improved.

The invention relates to an ore grinding medium type selection method based on capture area evaluation, and belongs to the field of ore grinding in ore dressing. The method comprises the following steps: calculating theoretical kinetic energy of a target grinding machine when the target grinding machine drops according to the mass of the grinding medium of the target grinding machine, the distance from the center of the medium to the center of the target grinding machine to the target grinding machine and the rotating speed of the target grinding machine per minute; a laboratory is constructed to simulate impact and quantify the capture area, the theoretical kinetic energy A serves as the reference, a pressure testing machine is used for acting on a medium, the impact of the medium on the standardized ore charge layer is simulated, and the capture area is quantified through the image processing technology; capturing area data of various media under different energies are obtained through stepped energy testing, and the media with the better capturing area are selected as the optimal ore grinding media through comparison. According to the method, quantitative measurement of the'capture area 'of the ore grinding medium is achieved, the problems of blind model selection, high cost and long period of a traditional ore grinding test are solved, and rapid, low-consumption and accurate medium model selection is achieved.

The utility model discloses a diamond edging wheel machining jig which comprises a working table, limiting grooves and diamond grinding wheels, the top face of the working table is provided with a plurality of limiting grooves distributed at equal intervals, the diamond grinding wheels are arranged on the upper surface of the working table, a limiting mechanism is arranged on the upper surface of the working table, and the diamond grinding wheels are located on the surfaces of the limiting mechanism. The limiting mechanism comprises a base, a rotary table, a supporting column, a connecting frame, a hydraulic rod, a pressing head and a limiting block, the base is arranged on the top face of the workbench, an inserting block matched with the limiting groove is arranged on the bottom face of the base, a first rotary supporting piece is arranged on the top face of the base, and the top face of the base is rotationally matched with the rotary table through the first rotary supporting piece. Through the arrangement of the device, the diamond grinding wheel can be limited and kept in a rotating state in the grinding test process after being machined, and the device is simple in structure and facilitates limiting of each diamond grinding wheel needing to be machined and tested.

This invention relates to the field of trial grinding technology for multi-axis grinding wheels, and discloses a test grinding piece and working method for test grinding of grinding wheels, including a clamping rod, a positioning base, and a bar stock; the clamping rod is mounted on a CNC grinding machine, and the positioning base is located at one end of the clamping rod; the bar stock includes at least one piece, which is mounted on the positioning base and forms a certain angle with the surface of the positioning base; the bar stock includes at least one end face to be ground. This invention enables the test grinding piece to meet the test grinding requirements at various test grinding points without repeatedly changing the test grinding piece and test grinding process, improving the versatility of the test grinding piece and the test grinding process, while reducing grinding volume, increasing material utilization, reducing production costs, avoiding deformation of the grinding wheel, and ensuring grinding accuracy.

The application relates to a kind of acetabulum grinding tool test system and method.The acetabulum grinding tool test system includes test tool and test component arranged in the test tool;The test tool includes driving assembly, force sensor and grinding tool, the driving assembly drives the force sensor or the grinding tool moves;The test component includes acquisition component and reproduction component, wherein the acquisition component is used to acquire force information when simulating real acetabulum grinding in acquisition state, and the reproduction component is used to reproduce the force information in reproduction state;By acquisition component, the stress data during actual grinding is acquired, and subsequent grinding test is carried out using reproduction component with relatively small friction, to reduce consumable consumption and reduce test cost.

The utility model discloses an automatic gear running-in test device for a transmission, and belongs to the technical field of transmission manufacturing. The positioning piece is connected to the bottom plate; the swing mechanism is hinged in the positioning piece, and the swing mechanism is connected in the positioning piece in a sliding mode; the elastic stop piece is arranged in the positioning piece; during testing, the transmission is locked on the bottom plate, the gear shifting arm extends into the transmission, the swing mechanism is pushed to slide on the positioning piece, so that the position of the gear shifting arm is changed, different gear shifting positions in the transmission are aligned, and the elastic stop piece abuts against the swing mechanism to limit the freedom degree of the swing mechanism in the sliding direction. The cylinder assembly stretches out and draws back to enable the push-pull rod universal joint to act on the swing mechanism to swing, swing of the swing mechanism is converted into reciprocating swing of the gear shifting arm, then the gear shifting arm pokes the transmission to conduct running-in, the running-in efficiency is high, the labor intensity is reduced, and the running-in quality is good.

The present application provides a kind of grinding device, including grinding pad and grinding table, grinding pad is placed on grinding table, grinding table drives grinding pad synchronous rotation;Wafer to be processed, wafer to be processed needs to carry out the grinding of metal structure;Wafer fixing device, for fixing wafer to be processed;Grinding dresser, grinding dresser includes substrate, substrate is provided with isolation layer and protruding abrasive particles, substrate is also formed with the metal ion supplement structure of the same material of metal structure, it is used for grinding platform to be in idle state or grinding test wafer, to grinding pad is ground to maintain its roughness, and simultaneously grinding metal ion supplement structure generates metal ion;Abrasive nozzle, for spraying grinding fluid and / or pure water.The present application ensures that new metal ions are always generated on the grinding dresser, the overall environment remains consistent, so that the chemical reaction is always in a stable state, and the product piece always maintains a high and stable grinding rate during the grinding process.

The invention belongs to the technical field of grinding testing, provides a grinding heat measuring device considering the heat transfer characteristic of a workpiece and a machine tool, and solves the problem that the accuracy of a measuring result is affected due to the fact that a traditional grinding heat measuring device changes heat transfer dynamics in the workpiece, and adopts the technical scheme that the grinding heat measuring device comprises a measuring clamp and a data processing module; the measuring clamp base is provided with freedom degree limiting assemblies for limiting a workpiece to move in the x-axis direction, the y-axis direction and the z-axis direction, and all the freedom degree limiting assemblies are matched to clamp the workpiece; a flexible grinding temperature sensor is arranged on the internal thread seat in contact with the lower surface of the workpiece in a covering mode, a flexible wire is arranged on the flexible grinding temperature sensor, and the flexible wire is connected to a data collecting and processing device; the data processing module is configured to receive the temperature data of the lower surface of the workpiece, and the grinding heat temperature distribution of the upper surface of the workpiece is obtained through inversion in combination with the parameters of the material of the workpiece to be detected and the constructed temperature difference equation of each node of the internal grid of the workpiece. And interference and damage to the surface of the workpiece are avoided.

The utility model discloses a semi-automatic clamping tool grinding device for grinding a metal test piece. The semi-automatic clamping tool grinding device comprises a belt sander, a clamping tool device arranged on the belt sander, an operation table arranged below the clamping tool device, and a counterweight weight and a power supply control box which are arranged beside the operation table, the belt sander comprises a sanding belt surrounding the sanding disc, a sanding belt shell wrapping the sanding belt, a driving motor arranged below the sanding belt, a driving wheel and a driven wheel arranged beside the driving motor, a belt surrounding the driving wheel and the driven wheel, and a fixing frame supported below the belt sander. The clamping tool device comprises an iron rod and a clamping tool arranged below the iron rod; wherein the iron rod is obliquely arranged on the column, the lower portion of the other end of the iron rod is installed on the clamping tool, and when not in use, the iron rod is placed on the operation table and when in use, the iron rod is moved to an abrasive belt of the belt sander. According to the utility model, the potential safety hazard caused by the fact that the hand is in close contact with the abrasive belt in the traditional hand-grinding test piece mode can be reduced; in addition, potential quality hazards caused by operation differences of workers can be reduced.

The utility model discloses grinding test equipment for plane abrasive cloth wheel machining, which comprises a test board, a positioning through hole is arranged at the upper end of the test board, a mounting mechanism is arranged on the inner side of the positioning through hole, a protective box is arranged at the upper end of the test board and positioned on the mounting mechanism, and a test mechanism is mounted at the upper end of one side in the protective box. The testing mechanism comprises a driving motor, a test piece and an adjusting assembly, a plurality of air inlets are formed in the lower end, located on one side of the testing mechanism, of the protection box, and a dust collection assembly is arranged on the other side of the protection box, so that dust and waste chips generated after grinding are conveniently collected. According to the grinding test equipment for plane abrasive cloth wheel machining, a protection box and a box door are used in cooperation, a grinding test area is limited, chippings generated in the test process are prevented from being splashed to the periphery very easily, the use safety is improved, meanwhile, a dust collection assembly is arranged, generated chippings and dust are conveniently sucked and collected into a collection box, and the grinding test equipment is convenient to use. And later cleaning is facilitated, and the use practicability is improved.

The utility model provides a carborundum machine needle rapid clamping and grinding testing device which comprises a device body, a testing cavity is formed in the device body, a clamping mechanism is installed at the bottom end in the testing cavity, and a grinding mechanism is installed on the inner wall of the testing cavity. According to the tooth needle grinding device, the tooth needle and the grinding mechanism are conveniently covered when a grinding test is carried out on the tooth needle, so that the condition of object splashing during grinding is avoided, a worker fixes the tooth needle into a clamping mechanism during operation, then an electric push rod is started, and then the electric push rod drives a rectangular protective cover to move downwards through a moving plate; therefore, the rectangular protective cover covers the grinding mechanism and the clamping mechanism, then the grinding mechanism is started to test the dental needle, the mode is easy to operate, splashing materials are prevented from hurting workers during testing, and the safety performance of equipment is improved.

The utility model relates to the technical field of running-in test tools, in particular to a flexible joint test tool capable of eliminating concentric errors. The tool comprises a tool body which is hollow inside, the tool body is arranged in an L shape, one end of the tool body is connected with an assembly input end through a mounting disc, and the other end of the tool body is connected with a test bed through a connecting spigot; the tool body comprises a positioning spigot, a spline housing and a flexible joint, the flexible joint is located in the positioning spigot, and the flexible joint is arranged in a hollow column shape; a motor shaft at the input end of the assembly extends to the flexible joint from the mounting disc, and the spline housing extends to a conical hole of the flexible joint from the middle part of the tool body; and the motor shaft and the spline housing are concentrically arranged through the flexible joint. According to the utility model, the motor shaft and the spline housing are concentrically arranged indirectly through the flexible joint, so that the rigid contact between the motor shaft and the spline housing is avoided, the occurrence of collision damage is fundamentally prevented, and the spline housing with higher cost is protected.

This invention relates to the field of inspection and control technology, and discloses an inspection and control method for adjusting the gradation of steel balls. The method includes: obtaining a set of target gradation ratios for grinding media; obtaining target bulk density and porosity characterization values; determining the initial gradation ratio; conducting multi-time-dimensional grinding tests on the initial gradation ratio using a proportionally scaled-down mixture under experimental-grade negative pressure conditions in an experimental-grade grinding equipment, obtaining a multi-stage sieve residue data sequence; extracting industrial-grade negative pressure parameters of the industrial-grade grinding equipment during actual operation, and calculating a dynamic grinding compensation factor; performing nonlinear correction on the multi-stage sieve residue data sequence based on the dynamic grinding compensation factor, and determining the optimal grinding media gradation strategy based on the corrected grinding efficiency evaluation index. This invention improves the accuracy of steel ball gradation inspection and the stability of grinding efficiency and product quality.