54results about How to "Avoid experimental error" patented technology

The invention discloses a microfluidic operation device which comprises a core module used for bearing and controlling liquid flow, a temperature adjusting module used for adjusting the temperature of the core module, a heat dissipation module used for reducing the temperature of the temperature adjusting module and a control module. The core module, the temperature adjusting module and the heat dissipation module are all in communication connection with the control module; in conclusion, the temperature of the core module is adjusted by using the temperature adjusting module, so that the core module can meet the temperature requirement of a biological experiment; the accuracy and repeatability of experimental results are ensured; in order to avoid the situation that the heat dissipation efficiency is reduced due to the fact that the temperature of the temperature adjusting module is too high, the invention further provides a heat dissipation module which is used for cooling the temperature adjusting module and transmitting the temperature of the temperature adjusting module to the heat dissipation module so that the temperature adjusting module can be kept in a high-efficiency state all the time.

The invention belongs to the technical field of collagen hydrolysis, and particularly relates to highland barley protein peptide enzymolysis equipment which comprises an enzyme feeding component, a stable base is arranged at the bottom of the enzyme feeding component, enzymolysis components are uniformly arranged on the inner wall of the stable base and comprise a heating component, a refitted container is arranged in the heating component, and the refitted container is connected with the stable base. And the heating part and the modified container are spliced to form an independent enzymolysis part. When the highland barley protein peptide enzymolysis work is carried out, the inserting sleeve containing the reaction test tube can continuously rotate under the control of the rotating motor and is matched with the resistance wire for surrounding heating, so that the reaction test tube is uniformly heated, and each enzymolysis component is relatively independently arranged, so that the enzymolysis efficiency is greatly improved under the condition that a large amount of heating equipment is not required to be arranged. All the reaction test tubes in the device can achieve the effect of uniform temperature control, so that the uniform enzymolysis efficiency of the protein peptide is ensured, and experimental errors are avoided.

The utility model provides a cable-stayed bridge dynamic and static experimental model, and particularly relates to the technical field of road bridge design, which comprises a concave base, two bridge towers are arranged on the base, each bridge tower consists of two cross beams and two upright posts, a bridge floor is arranged between the two upright posts, and the cross beams are arranged on the base. The bottoms of the bridge floors are connected with the top end of the base and the top end of the lower cross beam through supporting assemblies, a plurality of inhaul cable assemblies which are connected with the bridge floors and used for pulling the bridge floors are arranged on the two sides of the stand columns, the two bridge floors are arranged, an expansion joint is reserved between the two bridge floors, approach bridges are arranged on the two sides of the base, and an experiment trolley is placed on one approach bridge. The model is composed of a base, a bridge tower, a bridge floor, an inhaul cable assembly and an approach bridge, a solid bridge style can be restored in a high mode, and data types measured through the model are comprehensive; the approach bridge can be used for placing the experiment trolley before the experiment, so that the load can be prevented from being applied to the to-be-monitored part of the bridge model before the experiment is started.

The invention provides a high-precision autocollimator based on a Twyman Green interference principle and an angle measurement method, and aims to solve the problem that the existing angle measurement precision cannot be continuously broken through due to the limitation of a geometrical optics principle and the influence of environmental factors in the prior art. The autocollimator comprises a laser, a filtering collimation module, a spectroscope, a reference reflector, a plane reflector, a detector and a data acquisition and processing computer. After the autocollimator is leveled, the plane mirror is placed on a rotary table to be measured, measurement is carried out when the plane mirror does not have a rotation angle and when the plane mirror has a rotation angle, laser is emitted into the filtering collimation module and then is emitted to the spectroscope in the form of monochromatic parallel light and is divided into two paths, and one path is reflected by the plane mirror and then passes through the spectroscope again to reach the detector; the other path is reflected by the reference reflector and then reflected by the spectroscope to the detector; and the two beams of light generate interference on the target surface of the detector, and the detector records an interference image and uploads the interference image to a computer to calculate the offset of interference fringes, thereby completing angle measurement.

The invention discloses a nonlinear support system and a hypersonic velocity sweep / fixed frequency wind tunnel test method, and belongs to the technical field of wind tunnel tests. The device comprises a protection platform, a protection cover, a lifting platform, a vertical mounting plate, a protection cover shoulder split, a test model and a driving mechanism, the test model is mounted at the top of the vertical mounting plate through the driving mechanism, the vertical mounting plate is mounted on the lifting platform, the protection cover is mounted on the protection platform, and the protection cover shoulder split is arranged at the top of the protection cover. The vertical mounting plate and the driving mechanism are arranged in the protective cover; and the test model at the top of the vertical mounting plate extends out of the protective cover shoulder cleft of the protective cover. The technical problem that in an existing hypersonic wind tunnel test, structural nonlinear factors such as gaps, friction and collision between kinematic pairs of an executing mechanism are ignored due to a simplified supporting mode, and consequently the influence of the performance of the executing mechanism in a complex vibration environment cannot be truly reflected by a test result is solved. And a reliable test means is provided for revealing a structural nonlinearity and pneumatic nonlinearity coupling effect rule.

The present invention provides a water-stopping device for measuring soil separation rate, comprising a soil sample chamber, a first screw and a T-shaped rod; the soil sample chamber comprises a soil sample cavity, a gasket and a bottom plate. A first screw hole is provided in the center of the gasket and the bottom plate, and the first screw and the first screw hole are engaged with each other to be fixed to the bottom plate. When in use, the first screw is first rotated to separate it from the soil sample chamber, and the T-shaped rod is inserted from the first screw hole to support the soil sample from the bottom and put it into the soil sample chamber. Subsequently, the T-shaped rod is pulled out of the first screw hole, and the first screw is rotated to fix it to the bottom plate, and then the soil separation rate of the soil sample is measured. The device of the present invention is easy to manufacture, simple to operate, and has a good water-stopping effect. The first screw is screwed into the soil sample chamber, and the soil sample chamber can be quickly and conveniently water-stopped. At the same time, combined with the T-shaped rod, the soil sample can be easily put in and taken out of the soil sample chamber.

The utility model discloses a coal body permeability measuring device based on pulse pressure, which comprises an electric control device, a coal sample holder, a gas inlet system and a gas outlet system, a coal sample is clamped in the coal sample holder, the inlet end of the coal sample holder is connected with a main gas inlet pipe, the main gas inlet pipe is used for introducing gas into the coal sample and applying pulse pressure, and the gas inlet system is connected with the gas outlet system. A first pressure sensor is arranged on the main air inlet pipe; the upstream end of the main air inlet pipe is connected with a first pipeline and a second pipeline; the coal sample holder is connected with a confining pressure loading device and an axial pressure loading device; a first electronic flowmeter is arranged on the first pipeline; the second pipeline is connected with a pulse pressure generator, and a pulse pressure sensor and a pneumatic check valve are arranged on the second pipeline; a second pressure sensor and a second electronic flowmeter are arranged on the air outlet pipeline; in the experiment process, the pulse pressure generator can be adjusted to apply different pulse pressures to the coal sample, the permeability of the corresponding coal sample is observed, and the optimal pulse pressure is provided for gas extraction before coal mining, so that the relatively best gas extraction effect is realized.

The present invention discloses a multi-channel coordinated loading analysis test equipment for assembled buildings, and relates to the technical field of building loading test. The present invention includes a reaction frame, a horizontal loading mechanism, a vertical loading mechanism and a building test wall; the horizontal loading mechanism and the reaction frame are slidably matched; the vertical loading mechanism and the reaction frame are plugged in and matched; a positioning groove is opened at the center line of the surface of the workbench base in a mutually perpendicular direction to the T-shaped groove; the T-shaped groove is slidably matched with a fixed component; the positioning member and the sliding member are slidably matched; the telescopic member and the sliding member are plugged in and matched; the sliding member and the T-shaped groove are slidably matched; the positioning member and the positioning groove are plugged in and matched. The present invention slides two fixed components into the T-shaped groove closest to the two sides of the building test wall. When the fixed component slides to the top of the positioning groove, under the action of the reset spring, the plug-in plate is inserted into the positioning groove, the telescopic rod is started, and the extrusion plate is driven to clamp and fix the building test wall.

This utility model relates to the field of organ-on-a-chip technology, specifically a variable adaptive organ-on-a-chip fixture, including a lower clamp assembly, a sealing ring, an upper clamp assembly, locking screws, a clamp assembly, and connecting screws. Its key feature is that the upper and lower clamp assemblies are hinged together by the connecting screws, and both assemblies can be stretched and locked along their length. The upper clamp assembly has a sample inlet / outlet port, and the clamp assembly is fitted into the inlet / outlet port to fix the infusion tube. One section of the inlet / outlet port has an annular groove. In this variable adaptive organ-on-a-chip fixture, the upper clamp assembly engages with the insertion groove of the stretching upper clamp through the insertion shaft of the base upper clamp, and the lower clamp assembly engages with the guide groove of the stretching lower clamp through the guide shaft of the base lower clamp. It can be freely stretched along its length and locked by the locking screws, adapting to organ-on-a-chips with different length specifications without requiring replacement of the entire fixture set, thus solving the specification constraints of traditional fixtures that require only one clamp per chip.

This utility model relates to the field of rat smoking technology and discloses a rat smoking device, including a smoking chamber, a three-way valve, a smoking chamber, and an extraction and delivery component. The three ends of the three-way valve are detachably connected to a first hose, a second hose, and a third hose, respectively. The first hose is detachably connected to the smoking chamber. The smoking chamber is detachably connected to the third hose, and the smoking chamber can be used for burning cigarettes. The extraction and delivery component is detachably connected to the second hose and is used to draw the smoke from the burning cigarette in the smoking chamber through the third hose, the three-way valve, and the second hose. This utility model proposes a rat smoking device that generates smoke through the smoking chamber, which is then delivered to the smoking chamber via hoses and a three-way valve to smoke the rats, simulating the smoking process and avoiding experimental errors. Simultaneously, fresh air is introduced and smoke is expelled, simulating a natural smoking environment, diluting the smoke concentration, ensuring the survival safety of the rats, extending the smoking time, and obtaining more data on the chronic development of COPD.

The invention discloses a rat tail suspension device. The rat tail suspension device comprises a rollable section and an anti-climbing section, the rollable section comprises a fixed part and a movable part which are detachably arranged; a through hole is formed in the anti-climbing section; when an experimental mouse is fixed on the mouse tail suspension device, the fixed part and the movable part are arranged in an attached mode, the tail of the experimental mouse extends into a gap formed after the fixed part and the movable part are attached through the through hole, and the fixed part and the movable part are of a curled structure. The free end of the anti-climbing section is located below the lowest point of the rollable section, and the vertical distance between the free end of the anti-climbing section and the lowest point of the rollable section is 1-3 cm. The suspension device is simple in structure, reasonable in design, convenient to operate, firm in fixation in the use process, small in damage to mice, and higher in reliability and accuracy of experimental results.

The utility model provides a rotatably adjustable integrated component of a photodiode and a light beam stopper, which relates to the field of X-ray diffraction experimental instruments and consists of a fixed table, a translation table, a second translation table, an adapter plate, a vertical plate, a rotating arm, an L-shaped arm, a damping hinge, the photodiode and a central light beam stopper, an adapter plate is installed on the translation table and is in threaded connection with a vertical plate, the vertical plate is fixedly connected with the second translation table, the side face of the second translation table is in threaded connection with an L-shaped arm, the L-shaped arm fixes a rotating arm through a damping hinge, a center light beam stopper is fixed to the tail end of the rotating arm, and a photodiode is embedded into the front end of the center light beam stopper. And the limiting plate is mounted on the L-shaped arm. According to the utility model, through integration of the translation stage, the second translation stage, the damping hinge, the rotating arm, the central light beam stopper and the photodiode, the instrument is stable, the operation is simple and convenient, and the tediousness of the experiment and unnecessary errors are avoided.

The invention relates to the technical field of ultraviolet crosslinking devices, and discloses a multiband ultraviolet crosslinking instrument which comprises a light source module which is composed of a plurality of UVA, UVB and UVC band LED lamp beads capable of being independently controlled and arranged to form an area light source; the sensor module comprises ultraviolet sensors corresponding to three wave bands of UVA, UVB and UVC respectively and is used for detecting the ultraviolet light intensity of each wave band in real time; the human-computer interface is used for receiving a feedback signal of the sensor module; the ultraviolet cross-linking instrument effectively solves the problems that an existing ultraviolet cross-linking instrument adopts a plurality of ultraviolet lamp tubes to irradiate experimental materials in a cavity, a power control mode is that the lamp tubes are detached and replaced with lamp tubes with different light source wavelengths to irradiate in different wave bands, the lamp tubes are not surface light sources, the lamp tubes can cause uneven irradiation in the cavity, and the irradiation efficiency is low. The ultraviolet light intensity received by each area on the surface of the sample is inconsistent, so that the problem of experimental errors caused by non-uniform illumination can be solved.

The utility model discloses a gas taking device for petroleum and natural gas exploration, which comprises gas taking equipment, a connecting structure, a gas taking pipe and a positioning clamping piece, the top of the gas taking equipment is connected with the connecting structure, a gas taking port is connected in the connecting structure, the gas taking pipe is arranged in the connecting structure, and the positioning clamping piece is arranged in the gas taking pipe. And a pipe opening of the air taking pipe communicates with the air taking opening, movable cavities are symmetrically connected to the two sides of the connecting structure, sliding blocks are arranged in the movable cavities in a sliding mode, and springs are connected to the side portions of the sliding blocks at equal intervals. The sliding block, the spring, the positioning clamping piece and the positioning clamping groove are used in cooperation, the positioning clamping piece and the positioning clamping groove are clamped to complete the inserting state of the air taking pipe, the connecting stability of the air taking pipe and the connecting structure is improved, rapid detaching operation is convenient, deformation of the air taking pipe caused by the hand holding tightness is greatly reduced, and the service life of the air taking pipe is prolonged. And the air taking pipe is kept smooth, and the circulation of air stored in the air storage inner structure is improved.

The invention discloses a wood pyrolysis simulation method based on Fluent-UDF, and belongs to the technical field of energy utilization, and the method comprises the following steps: carrying out wood thermogravimetry, TG-DSC analysis, extraction of pyrolysis data characteristics, solving of a pyrolysis rate and a heat absorption and release calculation formula, and implantation in the Fluent-UDF to form a pyrolysis process reproduction code; the method comprises the following steps: performing Fluent simulation based on a wood pyrolysis environment, setting a wood area as a porous medium, loading a UDF code, and extracting wood thermogravimetric change simulation data after calculation; performing a wood pyrolysis experiment in the same environment to obtain wood thermogravimetric change data; wood thermogravimetric simulation and experimental data are compared, the wood pyrolysis simulation process is corrected, the wood pyrolysis simulation precision is improved, and therefore high-precision wood pyrolysis process simulation reproduction based on Fluent-UDF is achieved. According to the method, a reproduction method reference based on Fluent-UDF can be provided for wood pyrolysis simulation.

The utility model belongs to the technical field of impact testing machines, and discloses an impact testing machine centering device which comprises a machine base, a centering device body is arranged on one side of the top of an inner cavity of the machine base, a centering auxiliary assembly is arranged between the machine base and the centering device body, and the centering auxiliary assembly comprises a movable plate arranged on one side of the centering device body. Two limiting rods are symmetrically and fixedly connected to the top end and the bottom end of the movable plate, fixing plates are fixedly connected to the two sides of the movable plate, strip-shaped plates are connected to one sides of the two fixing plates in a sliding and penetrating mode, and clamping plates are fixedly connected to one ends of the two strip-shaped plates. According to the utility model, after the centering device body is installed and fixed by using the centering auxiliary assembly, during use, a user can rotate the adjusting rod to move the clamped and fixed centering device body to a certain position, and then the swing position on the impact testing machine can be adjusted, so that multiple tests are not needed, and the occurrence of test errors is effectively avoided.

The application discloses a kind of laser calibration devices of thin-walled shell axial compression test, it is related to the technical field of axial compression test, including laser calibration instrument system, control unit, servo motor, screw adjusting mechanism and clamping mechanism;Laser calibration instrument system is integrated with clamping mechanism, control unit is respectively connected with laser calibration instrument system, servo motor, screw adjusting mechanism and clamping mechanism, realizes closed-loop control, laser calibration instrument system and clamping mechanism adopt same reference coordinate system;Clamping mechanism is used for the nondestructive positioning and locking of thin-walled shell;The clamping end surface of clamping mechanism is embedded with pressure sensor;Laser calibration instrument system is used for real-time monitoring thin-walled shell displacement and positioning deviation, cooperates control unit, servo motor and screw adjusting mechanism to complete dynamic calibration.The application can realize the high-precision positioning and calibration of composite thin-walled shell in axial compression test process, and can avoid stress concentration when the shell is clamped and fixed, realize the nondestructive clamping and locking of shell.

The invention discloses a device and method for testing the electrical performance of a GIS insulation basin-type insulator, and belongs to the technical field of insulator electrical performance testing. Comprising two supporting plates symmetrically arranged on the two sides, a middle sliding rail installed between the two supporting plates, and a trolley base installed below the middle sliding rail. The basin-type insulators are vertically installed on the middle sliding rail, electrodes are arranged at the front ends and the rear ends of the basin-type insulators, the front ends of the electrodes are connected with the convex surface conductor of one basin-type insulator, the rear ends of the electrodes are provided with contacts, and the contacts make contact with the inner concave surface conductor of the other basin-type insulator to form a series circuit. A plurality of sliding grooves are formed in the supporting plate, and the supporting rods are movably installed in the sliding grooves. The middle sliding rail is matched with the supporting rod and is used for supporting and guiding the basin-type insulator to slide; a clamping groove is formed in the middle sliding rail. A central roller movement mode is adopted, the failure rate of a wheel type movement mode is reduced, assembly is easy and convenient, and the transportation smoothness is higher than that of the wheel type movement mode.

The invention belongs to the technical field of frozen soil detection, and discloses an in-situ frozen soil vane shear apparatus which comprises a supporting frame provided with a walking assembly. The locking mechanism comprises a plurality of locking assemblies arranged on the supporting frame. The lifting mechanism comprises a lifting frame arranged on the supporting frame, and a lifting assembly capable of lifting is movably connected to the lifting frame and used for controlling frozen soil at different depths to be subjected to shear tests; the shearing mechanism comprises a shearing motor arranged on the lifting assembly, the output end of the shearing motor is in transmission connection with a telescopically-arranged shearing assembly, and a circulating assembly used for controlling the temperature is circularly arranged in the shearing assembly. The device is simple in structure and convenient to use, can be conveniently transported to a field frozen soil area for a shear test, and can conveniently adjust the balance of the device and lock the device; due to the arrangement of the lifting adjusting function, shear tests can be conducted on frozen soil with different depths, it is guaranteed that the temperature of a shear area is matched with the outside world, and the accuracy of shear test data is improved.

The invention relates to the technical field of vacuum switches, and discloses an automatic control system and method for an X-ray test of a vacuum arc-extinguishing chamber, and the system comprises a fluorinated liquid adding and recycling unit, a data collection and control system, a test tool unit, a mechanical power unit, and a measurement unit. The test tool unit comprises a test groove, a vacuum arc-extinguishing chamber and an insulating support assembly. An observation window is formed in the side wall of the test tank; two ends of the insulation support assembly are connected with power ends. The liquid level sensor is arranged in the test tank; the measuring unit is located outside the test tank, and the measuring end of the measuring unit is aligned with the observation window of the test tank; the control end of the data acquisition and control system is respectively connected with the fluorinated liquid storage unit, the liquid level sensor, the mechanical power unit, the measuring unit and the power supply end. According to the invention, integration and intellectualization of an automatic control system are realized, automatic opening of the vacuum arc-extinguishing chamber, automatic measurement of the opening distance and automatic adding and recycling of the fluoride liquid are achieved, and the working efficiency is improved.

The invention relates to the technical field of dust detection, and specifically discloses a terahertz detection device for dust in a mine tunnel, comprising a detection box and a controller, wherein a plurality of transparent ventilation pipes are arranged at intervals in the detection box, the front end of the transparent ventilation pipe is opened and extends out of the detection box, and the rear end is connected to an exhaust pump through an exhaust pipe, a gantry across the plurality of transparent ventilation pipes is arranged in the detection box, movable seats are arranged on both side ends of the gantry, a driving assembly for realizing synchronous upward and downward movement of two movable seats is arranged on the gantry, and relatively aligned terahertz transmitters and terahertz receivers are respectively arranged on the two movable seats; when the terahertz detection device of the invention performs continuous multi-point detection, filtered gas can be introduced into other spare transparent ventilation pipes synchronously for effective flushing and cleaning, so as to avoid that subsequent detection results will be affected by the last detection, effectively avoid experimental errors, and ensure the accuracy of the detection results.

The present invention discloses an automated foam performance detection device, comprising a tank body, a bubbler tube is arranged in the center of the inner cavity of the tank body, the tank body is respectively connected to a liquid inlet system, a temperature control system, a bubbler system and a liquid discharge system, and an infrared signal system is also arranged on the tank body; the liquid inlet system comprises a water tank, a surfactant storage tank and a foam stabilizer storage tank, and the water tank, the surfactant storage tank and the foam stabilizer storage tank are all connected to the upper part of the bubbler tube; the temperature control system comprises a water bath, and the water bath is arranged on the lower outer side of the bubbler tube; the bubbler system comprises a gas cylinder, and the gas cylinder is connected to the bubbler tube through a gas delivery pipeline. The present invention adopts the method of upper liquid inlet and bottom gas distribution, which has the advantages of more uniform and dense foaming, rapid foaming and high foaming efficiency. In combination with the infrared signal system, the foam after foaming can be detected with high precision; the present invention has a high degree of intelligence, and can realize the integrated process of self-cleaning before foaming, during foaming and after foaming.

The present invention discloses a device and method for fully automatically measuring the surface adhesion of dust, the device comprises: a breaking unit, a gear unit, a crank mechanism, a base, a disc unit, and a sleeve unit; the breaking unit and the gear unit are fixed on the base; the breaking unit is arranged near the left side of the gear unit, and a crank mechanism is arranged above the gear unit; one side of the crank mechanism is fixed on the base, and the other side is fixed on the gear unit; the disc unit is arranged on the gear unit; the sleeve unit is fixed above the crank mechanism; the method comprises: performing a breaking operation by combining a low-speed motor with an elastic rope, and performing automatic sleeve assembly and automatic feeding operations by using a gear unit and a crank mechanism. The present invention can accurately capture the change of stress at the moment of dust peeling, avoid the experimental error caused by manual assembly, greatly improve the accuracy and repeatability, and the measurement process consumes less materials and can be recycled and reused.

The invention discloses a nozzle flow and flow direction test fixture and method. The clamp comprises a clamping mechanism used for clamping and positioning a to-be-tested part, an oil inlet mechanism used for introducing a test medium into the to-be-tested part, a test mounting seat used for mounting a flow test tool or a flow direction test tool, and a plugging mechanism used for plugging an oil outlet hole, which does not need to be measured, in the to-be-tested part. The oil inlet mechanism is fixedly mounted on the supporting seat, the test mounting seat is arranged in a to-be-tested part in a penetrating manner and is fixed on a central shaft of the supporting seat, and the flow test tool comprises an oil receiving copper pipe which is arranged in the test mounting seat in a penetrating manner and is used for receiving a test medium, a measuring cup communicated with the oil receiving copper pipe, and flow detection equipment arranged at the bottom of the measuring cup; the flow direction test tool comprises a measuring block fixed at a preset position on the test mounting seat, and a target hole is formed in the preset position in the measuring block; and the plugging mechanism covers and is fixed above the to-be-tested part. The device can effectively improve the test accuracy, is convenient to mount and dismount, and is high in efficiency.

The invention provides a method for separating granular organic matters and mineral binding organic matters in soil, which comprises particle size separation and density separation, and the separation of the granular organic matters and the mineral binding organic matters in the soil is realized by combining the particle size separation and the density separation. The invention discloses a separation device for soil granular organic matters and mineral binding organic matters. The separation device structurally comprises a soil-water mixing module, a screen, a wet screen monitoring module, a fine aggregate collecting box and a density grading pretreatment module, the soil-water mixing module is located above the screen and the wet screening monitoring module, and the screen is arranged between the soil-water mixing module and the wet screening monitoring module to achieve particle size grading of soil particles. The fine aggregate collecting box is located below the wet screening monitoring module, and the fine aggregate collecting box is mounted at the top of the density grading pretreatment module; according to the method, experimental errors caused by only adopting a single particle size grading method or a single density grading method are effectively avoided.

The utility model relates to the technical field of physical experiment teaching aids, in particular to a simple harmonic motion experiment instrument, which comprises a base, a liquid spraying device, a support arranged on the base and a paper feeding device arranged on the base, the support comprises a cross rod, a first vertical rod and a second vertical rod, the first vertical rod and the second vertical rod are arranged on two opposite sides of the cross rod, and the cross rod is provided with a cycloid and connected with a pendulum ball. A gap exists between the lowest point of the swing ball in the natural state and the base, a spring is fixed to the first vertical rod and is horizontally placed in the natural state, one end of the spring is detachably connected with the swing ball, the liquid spraying device comprises a spraying pipe, and the liquid outlet end of the spraying pipe is fixedly connected with the swing ball; a spring oscillator experiment and a simple pendulum experiment are integrated on one device, so that students can conveniently compare two simple harmonic motion phenomena on the same platform, the essence and generality of the simple harmonic motion can be deeply understood, and the teaching effect is optimized. Meanwhile, through the detachable connection design, quick switching between a spring oscillator experiment and a simple pendulum experiment is facilitated, and different experiment requirements are met.

This utility model provides a testing device for compressors, relating to the field of compressor testing technology. The testing device includes: a base; a connecting assembly connected to the base, the connecting assembly being movably disposed relative to the base along a preset direction, the connecting assembly having multiple working positions, and the connecting assembly being used to connect to the compressor to be tested; and a locking assembly connected to the connecting assembly, the locking assembly having a locking position for locking the connecting assembly and a releasing position for releasing the connecting assembly. When the connecting assembly moves relative to the base along the preset direction to each working position, the locking assembly is in the locking position, adapting to the precise installation and adjustment of the compressor to be tested under different testing requirements, thus solving the problem of inconvenient position adjustment and fixation of electric air compressors in the prior art.

The utility model relates to an inertial navigation system mounting structure and a vehicle-mounted inertial navigation test system.The inertial navigation system mounting structure comprises a mounting frame, a pitch angle adjusting frame, a roll angle adjusting frame and a course angle adjusting seat, the mounting frame comprises a plurality of stand columns, and lifting assemblies are arranged on the stand columns; the pitch angle adjusting frame is rotatably arranged on the mounting rack around a first direction; the roll angle adjusting frame is rotatably arranged on the pitch angle adjusting frame around a second direction; the course angle adjusting seat is rotatably arranged on the roll angle adjusting frame around a third direction, the first direction, the second direction and the third direction are perpendicular to one another, and a mounting part is arranged on the course angle adjusting seat. The position of the high-precision inertial value system arranged on the mounting part can be adjusted through the lifting assembly, the pitch angle adjusting frame, the roll angle adjusting frame and the course angle adjusting seat, so that the height position and each axial mounting angle of the high-precision inertial value system are kept consistent with the vehicle-mounted inertial measurement element; complex angle conversion is not needed for test data collected by a high-precision inertial value system, and comparative analysis can be directly carried out.

The invention relates to a TC4 material corrosion resistance verification method. The method comprises the following steps of test medium preparation, sample preparation, sample placement, salt spray test parameter setting, test process monitoring and test result evaluation. A sodium chloride solution with the relative density of 1.029-1.036 is prepared at the temperature of 25 DEG C, and the pH value of the solution is adjusted, so that the stability of a test medium is ensured; a TC4 sample with a standard size is adopted, and the surface is subjected to cleaning, drying and microscopic examination, so that the quality of the sample is ensured; placing the sample in a salt spray test box according to an angle of 15-25 degrees, setting temperature, humidity, spray pressure and time parameters, and accurately controlling a test environment; the corrosion behavior of the sample is scientifically evaluated by combining a rating judgment method, a weighing judgment method and a corrosive appearance judgment method. The method can effectively improve the accuracy and repeatability of TC4 material corrosion resistance verification, is suitable for the fields of aviation, aerospace, ocean engineering, medical instruments and the like, and has a wide application prospect.

The invention discloses a method for detecting the collision safety of an automobile threshold assembly, and the method comprises the following steps: a, installing the threshold assembly at the upper parts of two supporting rollers of a high-speed drop hammer testing machine, and placing a drop hammer above the middle position of the two supporting rollers; b, releasing the falling mallet, and recording the stress of the threshold assembly and the displacement of the collision point in the collision process by the high-speed falling mallet testing machine; c, the average acting force borne by the automobile threshold assembly in the whole collision process is calculated according to the force-displacement curve; d, the bending moment borne by the threshold assembly is calculated; e, calculating the average value of the bending moments borne by the threshold assembly obtained by the three tests; and f, judging the collision safety of the threshold assembly according to the average value of the bending moment. According to the invention, the bending moment is used for representing the collision safety performance of the automobile threshold assembly, and the test error caused by inaccurate collection of a single instantaneous value is effectively avoided. Compared with a traditional method, the method has the advantages that the detection cost is low, and the accuracy of a detection result is greatly improved.