101results about How to "Improve trial safety" patented technology

The pig circular ring virus 2 type (PVC2) inactivated vaccine (SH individual plant) of the invention belongs to biotechnology field. The pig circular ring virus 2 type poisonous individual plant SH belongs to circular ring virus section circular ring virus genus which has been preserved in Wuhan institute of virology, Chinese academy of sciences. The shanghai separated individual plant SH of purified PCV2 virus is obtained by gathering raw material from hogpen which happened bad weaning piglet multisystem exhaustion failure syndrome in Shanghai in 2002 year, separating, appraising and purifying virus. The PCV2-SH plant is proliferated in mass in PK-15 cell, inactivated through methyl aldehyde and emulsified with liquid paraffine adjuvant to prepare conventional liquid paraffin(e) adjuvant immunomodulators for vaccines. The laboratory has trial-manufactured five lots vaccines successfully which are good safety and also can induce pig bring immune protection effect, made out a draft rules for vaccines production and testing. The inactivated vaccine proved by every aspects experiment has met state biological products standard completely.

The invention discloses a plate clamper platform for a falling weight impact test, and an impact speed measurement method. The plate clamper platform comprises a clamper structure, a supporting lifting structure and a laser sensor, wherein the clamper structure comprises a plate clamping device, a multi-angle rotation device and a clamper bottom plate, the multi-angle rotation device comprises wall plates, wall plate bolts and a bottom plate bolt, each wall plate is provided with a central hole and two arc-shaped grooves, the two arc-shaped grooves are symmetrically arranged relative to the central hole, clamping plates can rotate along the arc-shaped grooves after the wall plate bolts are completely loosened, the supporting lifting structure comprises a platform and a lifting driving device, the clamper bottom plate can rotate by adopting the bottom plate bolt as the center and can slidably move along a straight strip hole, and the laser sensor is arranged below the weight tray positioned on the periphery of a hammer head. With the plate clamper platform and the impact speed measurement method of the present invention, the composite material plate specimen can be tightly clamped, the multi-angle impact on the specimen can be achieved, and the speed change during the drop hammer falling and impact process can be real-timely measured.

The invention discloses dynamic impact test equipment. The dynamic impact test equipment comprises a ground rail, a counterguard wall surface, a trolley, a traction device, a braking device, a cushioning device and a test recording device, wherein the counterguard wall surface is provided with a test sample piece. The trolley is arranged on the ground rail, can run along the ground rail and is provided with an impact device. The impact device can run together with the trolley, can slide on the trolley under the effect of inertia and then impacts the test sample piece which is installed on the counterguard wall surface. The dynamic impact test equipment can conduct a high speed dynamic impact test of automobile body components and parts and is simple in structure and low in cost.

The invention provides a semi-physical simulation device and a simulation method for a combined gas turbine and gas turbine power generation unit of a ship, and relates to a simulation device and a simulation method for the combined gas turbine and gas turbine power generation unit of the ship, aiming at solving the problem that the existing combined gas turbine and gas turbine power generation unit is low in simulation precision and higher in risk of the test process. Aiming at the simulation demand of the combined gas turbine and gas turbine power generation unit of the ship, a practical physical part is added on the basis of digital simulation of the conventional computer, so that a simulation system is more approximate to the running status of a real machine, and is high in simulationprecision. Meanwhile, after simulation is carried out on the combined gas turbine and gas turbine power generation unit of the ship by the semi-physical simulation device and the simulation method, the test debugging quantity of a full-physical test table can be greatly reduced, tests which cannot be performed under the status of the real machine can be performed, and the test security can be greatly improved. Therefore, the invention is applicable to the semi-physical simulation for the combined gas turbine and gas turbine power generation unit of the ship.

The invention provides a point load tester and a point load testing method. The point load tester comprises a bearing box which is used for placing and fixing a rock test block, wherein the bearing box comprises an upper plate, a lower plate and a side plate; the lower plate is connected with a bearing box main body through an elastic connection part; the elastic force of the elastic connection part is greater than the sum of the gravity of the rock test block and the lower plate, and the rock test block can move upward along the lower plate under the action of the elastic force of the elasticconnection part after the rock test block is put into the bearing box until the rock test block abuts against an upper tapered pressing head, so that the rock test block is fixed. According to the point load tester provided by the invention, the rock test block does not need to be manually grasped by hands in a point load testing process, so that the safety hidden dangers are eliminated, the convenience of operation is improved and manpower is saved; The upper plate and the side plate of the bearing box have an anti-splashing effect on the rock test block and the testing safety is enhanced; the possibility that small blocks formed by cracking the rock test block collapse and move for a long distance is also avoided, and the small blocks are convenient to splice and recover at a later period.

The invention discloses a method for evaluating the insulation state of electrical equipment. A matrix beam algorithm is utilized to identify equivalent circuit parameters of an expanded Debye model of the electrical equipment according to polarization and depolarization current for time-domain dielectric response of the electrical equipment, and then insulation state parameters such as a dielectric loss are calculated to evaluate the insulation state of the electrical equipment. The method comprises the following steps of firstly, measuring the polarization and depolarization current of the electrical equipment and then constructing a Hankel matrix by using the depolarization current as parameters; secondly, carrying out singular value decomposition on the Hankel matrix and judging a signal subspace and a noise subspace according to a singular value in a singular value curve in order to determine the number of relaxation branches and relaxation parameters of the expanded Dubai model;finally, using the determined relaxation branches for constructing the insulation-expanded Debye model of the electrical equipment and calculating the insulation state parameters such as the dielectric loss according to the model. Therefore, an accurate and reliable diagnosis method is provided for evaluating the insulation state of the electrical equipment.

The invention relates to a semi-physical simulation device and a simulation method of a ship gas turbine generator set. The device and the method solve the problems that the simulation accuracy of the existing gas turbine generator set is low and the risk in the test process is high. Aiming at the need of simulating the ship gas turbine generator set, on the basis of the traditional computer digital simulation, by adding partial physical devices, a simulation system is enabled to get closer to the running state of a real generator. At the same time, by using the device and the method to simulate the ship gas turbine generator set, the debugging quantity for the test of the real generator can be greatly reduced, tests which cannot be conducted in a real generator state can be conducted, the test expenses are saved and the test safety is increased. The device and the method are suitable for the semi-physical simulation of the ship gas turbine generator set.

The invention discloses a remotely-controlled wide-range gas leakage rate detection device which is mainly used for gas leakage rate detection in a test process of a low-temperature valve of an oxyhydrogen rocket. The device includes a camera device, a data processor, a unit control console, a measurement and control cable, a gas collecting tube, flow meters, a bubble leakage detector, electromagnetic valves and a metal pipe. The remotely-controlled wide-range gas leakage rate detection device adjusts a measurement range through the unit control console and has a function of a flow meter and a function of bubble leakage detection and leakage rate data are obtained through remote monitoring. The bubble leakage detector is designed according to a pressure balance principle of communicated containers so that frozen accidents caused by back flow of a leakage liquid, which is resulted from low temperature negative pressure of a gas, can be effectively prevented. The device realizes remote control of leakage rate detection of a low temperature test and realizes a man-machine isolation operation mode so that the device is applicable to leakage rate detection of different leakage rate assemblies and capable of improving test security.

The invention provides a testing device for assisting rod-shaped sample uniaxial drawing through pulse current. The device comprises a pulse power source and a drawing test machine, the drawing test machine comprises drawing clamps and a driving device, the drawing clamps are fixedly connected with the two ends of a rod-shaped sample, the driving device is used for driving the drawing clamps to get close to or away from each other, and the two ends of the rod-shaped sample are provided with conductive rings connected with the positive pole and the negative pole of the pulse power source respectively. Each drawing clamp is provided with a wedged-shaped cavity, wherein the cavity is internally provided with two opposite insulating clamping blocks, the opposite sides of the two insulating clamping blocks are provided with clamping grooves, each clamping groove is internally provided with a positioning clamping block, the opposite sides of the two positioning clamping blocks are provided with positioning grooves used for containing the two ends of the rod-shaped sample and the conductive rings, and knurled anti-skid structures are arranged on the contact surfaces of the positioning grooves and the rod-shaped sample. The device is suitable for research of deformation behaviors of rod-shaped metal materials under the action of the pulse current, processing of the sample is facilitated, material waste is avoided, and joule heat generated at the joints is reduced.

The invention provides a device for testing the fire protection ability of a pipeline. The device comprises a combustor, a sensor and a data collection system, wherein the combustor is used for combusting the pipeline, and an ignition region is formed by a flame region of the combustor; the sensor is used for sensing at least one physical parameter of the pipeline and / or the other pipeline in an / or out of the ignition region and outputting a sensing result; and the data collection system is stored with a material property storage coefficient of the pipeline and a pre-warning value determined according to the relation between the coefficient and the physical parameter and is used for calculating the physical parameter of the pipeline according to a sensing result, carrying out comparison onthe physical parameter of the pipeline and a pre-warning value and emitting a warning signal when the physical parameter of the pipeline exceeds the pre-warning value. The invention further providesa method for testing the fire protection ability of the pipeline corresponding to the device.

The invention discloses a direct-current short-time supply interruption and supply voltage leap simulation test device, which comprises a manual switch connected with a system under test, wherein the manual switch is connected with a direct current supply voltage leap variable load in parallel, and is switched in a supply network through a first switching element; two ends of a second switching element are respectively switched in between the first switching element and the supply network as well as between the manual switch and the system under test in parallel; and the first switching element and the second switching device are respectively connected with a microprocessor. According to the test device, the microprocessor can control to ensure the switching elements to be switched off completely, and the accurate time for switching off and switching on the two switching elements can be accurately controlled, so that the time for direct-current short-time supply interruption is accurately controlled; when a supply voltage leap simulation test is carried out, resistance has no need to be switched in manually, so that the labor intensity is reduced, and the test safety is improved; and the prolonged time for voltage leap is shorter, so that a current situation can be better simulated.

The invention discloses a high temperature test system for a water pump drive motor and a controller. The system comprises a drive motor, the controller, a water pump, a radiator, an electric heatingbox and a control and data acquisition unit, wherein the drive motor and the controller are to-be-tested device; the water pump and the radiator are connected by a pipeline to form a closed circulation pipeline; the water pump is driven by the drive motor; a temperature sensor, a pressure sensor, an electronic valve and a flow meter are connected to the pipeline between a water outlet of the waterpump and the radiator; the pressure sensor is also installed on the pipeline between a return water port of the water pump and the radiator; the drive motor and the controller are respectively installed in an electric heating box with controllable ambient temperature; the control and data acquisition unit are simultaneously connected to the drive motor and the controller; and the control and dataacquisition unit monitors and records the input current and voltage of the controller, the controller chip temperature, the motor shaft end temperature of the drive motor, and determines the high temperature test condition of the drive motor and the controller through the system running time.

The invention discloses an automatic measurement system of motor hot resistance and a work method thereof. By adopting the automatic measurement system of the motor hot resistance, the measurement of the whole motor hot resistance can be completed in an automatic control manner, and the measurement work of a tester is simpler and easier; in addition, in the measuring process, test failures caused by accurate timing or reading which is due to human factors are avoided, the measurement precision is improved, the phenomenon that the tester carries out a test beside a machine rotating at a high speed is avoided, and the test safety is substantially improved.

The invention relates to a test method for simulating real vehicle slipping frictional starting durability on a test board, and belongs to the technical field of engines. The test method comprises thefollowing steps that: 1) a power assembly is fixed on the mounting bottom plate of a power assembly testbed, and a test accessory is installed; 2) a simulation parameter is determined; 3) the power assembly is driven to carry out a test; 4) S3 is repeated to circulate for 200-thousand times; and 5) after a test working condition finishes operating, the power assembly is disassembled from the testbed, teardown inspection is carried out, a clutch which is most suitable for controlling slipping frictional starting is found, and meanwhile, the best control combination way for the clutch is foundduring the slipping frictional starting. By use of the test method disclosed by the invention, road resistance when the real vehicle is actuated to drive and the road maximum static friction resistance during starting can be simulated, simulated operation that the real vehicle is changed into starting driving from a static state is realized on the power assembly testbed, the durability checking ofthe slipping frictional starting driving working condition can be finished, the combined state change of a transmission clutch in the slipping frictional starting driving working condition is effectively verified, and a test period is greatly shortened.

The invention relates to a preparative method of derivative of memantine hydrochloride alkyl 2-sulfer 2-nitrogen, and belongs to the technical field of synthesis of marking precursor compound for radiopharmaceutical. The invention provides a preparative method of N-[-(N-2-thiolethy)) amino acetyl]-(2- thiolethy)-3, 5-NCAM to prepare the radiopharmaceutical of 99m<Tc-NCAM marked by technetium which is used for image display of brain receptor. Being approved by experiment, the NCAM meets the requirements of permeability about blood brain barrier(BBB) in the aspects such as electroneutrality, molecule size and lipid solubility(LogP). After being mixed with other adjuvant drug and frozen, the NACM is easy to product a medicine box with good stability and a marking rate of above 95 percent. The prepared 99m<Tc-NCAM is tested by an animal distribution in mouse and radiation self-developing test, and the result is that the 99m<Tc-NCAM concentrates on the striaturn and hippocampus of the mouse. With high safety in animal test, the invention is a potential developer of the brain receptor.

The invention relates to a brake-tire-ground inner rotary drum type inertia brake test bench. The test bench comprises a ground foundation, a transmission system, a brake system, a control system, and a detection system. An industrial personal computer sends a speed command to a PLC, adjusts the speed of a frequency converter by controlling the frequency converter so as to adjust the speed of a vehicle, sets the moving inertia of the vehicle through an inertia adjusting device, sets the pressure exerted by a hydraulic cylinder on the ground, brakes the wheels of the moving vehicle through a brake actuator, and acquires the braking parameters of the vehicle through corresponding sensors. The technical problem that the existing test device cannot truly reflect the actual braking process of a vehicle is solved.

The invention provides a method for testing transmission path performance of a solar array driving mechanism. The method comprises the following steps: step 1, a test state is established firstly: power supply of a ground-based simulation array is shunted by a ground transfer cable bundle into two parts; step 2, conductivity and insulativity of a transmission path of the solar array driving mechanism are tested; step 3, then, open circuit voltage of the transmission path of the solar array driving mechanism is tested; step 4, finally, transmission heat consumption of the transmission path of the solar array driving mechanism is tested, a cable connection state in step 1 is restored, and during a surface heat test, all transmission slip rings and star cables of the solar array driving mechanism transmit rated current, and heat consumption of the transmission path of the solar array driving mechanism is simulated accurately. The transmission path performance of the solar array driving mechanism of a satellite is tested on the ground, test coverage of a power supply channel of the satellite of a product is finished, and product reliability is improved.

The invention provides a rock test block fixing device for a point load test. The rock test block fixing device comprises a bearing box for containing a rock test block, wherein the bearing box comprises an upper plate, a lower plate and a side plate; the lower plate is connected with a bearing box main body through an elastic connection part; the elastic force of the elastic connection part is greater than the sum of the gravity of the rock test block and the lower plate; after the rock test block is put into the bearing box, the rock test block can upward move along with the lower plate under the action of the elastic force of the elastic connection part and finally pushes against an upper tapered pressing head, so that the rock test block is fixed. In a point load test process, the rocktest block does not need to be manually grasped by hands so that the safety hidden dangers are eliminated; the convenience of operation is improved and the manpower is saved. The upper plate and theside plate of the bearing box have a splashing-prevention effect on the rock test block and enhance the safety of the test; meanwhile, the possibility that small blocks formed by cracking the rock test block collapse and move for a long distance is also avoided, and the small blocks are convenient to splice and recover at a later period.

The invention discloses a natural gas conveying pipe system pressure test device comprising a cryogenic liquid storage tank, cryogenic liquid pumps and an air-heated vaporizer, wherein the cryogenic liquid storage tank is connected with the cryogenic liquid pumps through a pipe, the cryogenic liquid pumps are respectively connected with an air return port and the air-heated vaporizer through a pipe, and the air-heated vaporizer is connected with a gas utilization point through a pipe. The natural gas conveying pipe system pressure test device has the following advantages: high-voltage test on a system can be completed in a short time, the test safety is high, tightness test can be immediately carried out, the test cycle is shortened, and cost is saved.

The invention discloses a test work platform with both revolving and angle adjusting functions. The test work platform comprises a motor, a work platform body, a revolving platform and a base, wherein the work platform body is connected with the revolving platform and used for holding an object to be tested; the revolving platform is located above the base; a hole is formed in the upper surface of the base; a main gear shaft is connected with the revolving platform through the hole, further connected with a motor and used for driving the revolving platform to revolve under the driving of the motor; an inclined wedge is arranged between the work platform body and the revolving platform and used for moving along the surface of the revolving platform, so that the work platform body is inclined, and the inclination angle of the work platform body is adjusted. The test work platform has the revolving and angle adjusting functions. The object to be tested does not need to be transferred back and forth among work platforms with different functions for tests with various parameters and does not need to be positioned, leveled, fixed or the like again. Especially for a large product or workpiece, the waste of manpower, material resources and time is avoided.

The present invention discloses a power cable frequency conversion resonance voltage-withstand test operation technology. The technology comprises the following steps: 1) preparing a test apparatus and device; 2) explaining work content, electrification positions, field safety measures and field work danger points to testers, and clarifying personnel division and the test program; 3) performing preparation prior to the text; 4) performing wiring and test; 5) ending the test; and 6) performing analysis of a test result and filling out a report. The operation technology has guidance and can give workers clear test steps when the power cable frequency conversion resonance voltage-withstand test is performed so as to test safety.

The invention belongs to the field of electric vehicle, and especially relates to a whole vehicle model system for a whole vehicle controller of a new energy vehicle. The whole vehicle model system ischaracterized by comprising a driver module, a whole vehicle controller module, a motor module, a transmission module, a main reducer module, a vehicle wheel module, a vehicle speed module and a battery module; wherein the driver module is connected with an input end of the whole vehicle controller module, an output end of the whole vehicle controller module is connected with an input end of themotor module, an output end of the motor module is connected with an input end of the transmission module and an input end of the battery module, an output end of the transmission module is connectedwith an input end of the main reducer module, an output end of the main reducer module is connected with an input end of the vehicle wheel module, and an output end of the vehicle wheel module is connected with an input end of the vehicle speed module. The whole vehicle model system of the invention has the beneficial effects that: the number of real vehicle tests is reduced, test safety is improved, test repeatability is improved, and whole vehicle development period is shortened.

The invention discloses a mixing and self-cleaning device for mixing a cement concrete and forming a test piece. The mixing and self-cleaning device for mixing the cement concrete and forming the testpiece comprises a mixing device, a lifting device, a vibrating device and an electronic platform scale, wherein a feed inlet is formed in the top part of the mixing device; a discharge hole is formedin the bottom part of the mixing device; the lifting device is arranged on the discharge hole of the mixing device; a mould and the electronic platform scale are arranged on the top part of the lifting device; a shovel plate is arranged at the free end of a stirring blade and contacts the inner wall of a mixing cylinder; and a cleaning nozzle is arranged on the top part of the mixing cylinder andcommunicates with a water tank through a water passing pipeline. The shovel plate contacts the inner wall of the mixing cylinder, so that the cement concrete on the inner wall of the stirring cylinder can be shoveled so as to be uniformly mixed, and the instrument can be conveniently cleaned; through additionally arranging a cleaning device, the automatic cleaning work of a mixer can be realized,so that not only can manpower be saved maximally, but also the test time can be effectively saved; and through arranging the electronic platform scale on an operating floor, the quality of the cementconcrete test piece can be controlled through weighing, and the standardness of the test piece is further controlled.

The invention discloses a pre-processing method for determination of phosphorus. The method comprises steps as follows: performing first-level digestion on a dairy product to obtain a first-level digestion product; carbonizing the first-level digestion product to obtain a carbonization product; adding hydrogen peroxide to perform second-level digestion on the carbonization product to obtain a second-level digestion product. The invention further discloses a method for detecting phosphorus in the dairy product. The methods adopted for performing pre-processing of phosphorus determination and / or determination of phosphorus content of the dairy product have the advantages of safe detection, low environmental pollution, high efficiency and low cost.

The invention relates to a high-voltage transformer test protection device with a multi-protection function. The high-voltage transformer test protection device is respectively connected with an infrared radiation alarm device, an over-current protection device and a high-voltage transformer test control power supply. The high-voltage transformer test protection device comprises a leakage protection air switch, an overall power access circuit, a grounded detector, a transformer, an enable signal converter, an alternating current contactor and a voltage regulator, wherein the leakage protection air switch, the overall power access circuit and the grounded detector are sequentially connected; the grounded detector is respectively connected with the enable signal converter, the alternating current contactor and the transformer; the alternating current contactor is connected with the transformer; and the enable signal converter controls the switching-off or switching-on of the alternating current contactor according to enable signals of the infrared radiation alarm device, the over-current protection device and the grounded detector. Compared with the prior art, the high-voltage transformer test protection device improves test safety and reliability and has the multi-protection function.

The invention relates to the field of vehicles, and discloses a semitrailer for a test. The semitrailer for the test comprises a test load tool and an auxiliary supporting wheel device. The test loadtool comprises a base, a support, an installation frame, a weight box and a supporting column, and the auxiliary supporting wheel device comprises a hanging longitudinal beam, a first truss, a secondtruss, a first supporting wheel and a second supporting wheel. According to the semitrailer for the test, an occupied space is saved, and an influence on a test result due to simulated load shaking ina test process is avoided; simulation load loading time is reduced; test efficiency is improved; and the semitrailer is large in mass center position adjusting range, can meet operation stability test requirements of most semitrailer tractors, can meet test requirements of multiple mass center positions without replacing different types of semitrailers, can assist in supporting the semitrailer under extreme working conditions, and prevents tire burst caused by an overlarge stress of wheels of the semitrailer for the test.

The invention discloses a GTEM-based antenna lightning surge coupling test method. An antenna lightning surge coupling test system based on a GTEM is constructed, wherein the constructed system consists of a test platform construction module, a lightning electromagnetic pulse peak electric field strength adjustment module, an antenna lightning surge voltage measurement module, a lightning electromagnetic pulse coupling coefficient determination module and a lightning surge voltage index determination module. The test platform is built by using the test platform construction module; the lightning electromagnetic pulse peak electric field strength adjustment module controls and adjusts the lightning electromagnetic pulse peak electric field strength; the antenna lightning surge voltage measurement module measures a lightning surge voltage of a measured antenna; the lightning electromagnetic pulse coupling coefficient determination module determines a lightning electromagnetic pulse coupling coefficient; and the lightning surge voltage index determination module determines a lightning surge voltage index.

The invention discloses a propellant charge ignition comprehensive simultaneity evaluation method. According to the propellant charge ignition comprehensive simultaneity evaluation method, sensor supports of fixed sensors are prepared based on the shape of a propellant chamber and charged propellant structures, the sensors are fixedly arranged on the sensor supports; one terminal of each sensor isarranged on a corresponding sensor support via welding, is introduced into the propellant chamber, is firmly contacted with the propellant chamber, and is taken as one signal line terminal, the otherlead of the sensor is fixedly connected with an insulation sealed electrode on an end cap of the propellant chamber so as to form another signal line terminal; the propellant is introduced into the propellant chamber; a pressure release fragment is selected and installed based on projectile pulling in pressure and propellant charge comprehensive ignition theoretical pressure; igniting and testingare carried out, analysis on test signals is carried out so as to realize evaluation of the ignition comprehensive simultaneity of propellant charge. The propellant charge ignition comprehensive simultaneity evaluation method is capable of solving test problems in propellant charge ignition effects (simultaneous and comprehensive effect), solving a key technical problem that no scientific effective method used for evaluation of propellant charge ignition is available, and providing feasible testing and evaluating means for propellant charge design.

The invention belongs to a glass test technology, and particularly relates to a submersible observation window pressure-resistant test device and a submersible observation window pressure-resistant test method. The submersible observation window pressure resistance test device comprises a mechanical pressurization device, a glass test clamp, a sensor and an environment box. A servo hydraulic universal testing machine provides mechanical pressure, the mechanical pressure is transmitted to a testing clamp through a pressing rod and a pressing disc, the testing clamp is composed of a pressing head and a base, a glass sample piece is arranged in the base, the whole clamp containing the glass sample piece is arranged in the center of the pressing disc, and the mechanical pressure is transmitted to the clamp through the pressing disc and then transmitted to the glass sample piece through the clamp. A sensor can be laid on the inner surface of the glass sample piece. And the whole pressed part is arranged in the environment box. According to the invention, the size of the real submersible observation window is reduced according to a certain proportion, a scaled glass sample piece is processed, hydrostatic pressure conversion calculation on the observation window under the service condition is converted into mechanical load for testing, and various service conditions of the observation window glass can be simulated quickly, safely, accurately and economically.

The invention belongs to the technical field of environmental tests, and discloses a grid disc supporting assembly and an environmental test box, the grid disc supporting assembly comprises two groups of supports and a slide rail, and the two groups of supports are respectively arranged on two opposite inner walls of the environmental test box; a plurality of variable-diameter mounting holes are formed in the support in the vertical direction, and the variable-diameter mounting holes comprise first holes and second holes which communicate with each other; the at least two sliding rails are connected to the two sets of supports respectively, variable-diameter installation heads are arranged on the sliding rails, each variable-diameter installation head comprises an installation cap and an installation neck, the variable-diameter installation heads and the variable-diameter installation holes are selectively installed in a matched mode so that the installation heights of the sliding rails can be adjusted, disassembly and assembly are convenient and fast, and the two ends of the grid disc are supported on the top end faces of the two sliding rails. According to the invention, the grid disc is in surface contact support with the slide rail, so that the support stability of the grid disc is improved; clamping grooves or clamping protrusions do not need to be machined on the grid disc, the strength of the grid disc is ensured, and deformation is avoided; and the height position of the grid disc is realized through switching of the slide rails on the bracket, so that the test safety and efficiency are greatly improved.