619results about "Laboratory benches/tables" patented technology

The invention relates to the technical field of deep-sea microorganism nucleic acid detection, in particular to a long-term experimental platform for deep-sea microorganism in-situ nucleic acid detection and a detection method. According to the invention, a water sample is subjected to tangential flow filtration and concentration through the filtration and sampling module, so that a concentrated microorganism sample is obtained. The method comprises the following steps of: transferring a sample into an amplification detection module under reduced pressure, transferring into a lysis purification module for cell lysis, injecting the cracked sample into a chromatographic column, filtering impurities and intercepting DNA by the chromatographic column, then washing by using an eluent to obtain a high-purity DNA sample, loading a suction head through a transfer washing liquid gun, mixing the high-purity DNA sample with an enzyme solution, adding into the amplification detection module for reaction, and detecting the DNA in the amplification detection module. And carrying out fluorescence labeling on the amplified gene, obtaining an amplification curve by using a fluorescence detector, and detecting the in-situ nucleic acid of the deep-sea microorganisms according to the change of the amplification curve. An automatic cleaning assembly is designed in the filtering and sampling module, and the cracking and purifying module is used for sampling and cleaning a cracking chamber and switching pipelines, so that cross contamination caused by deep sea in-situ multiple detection is prevented.

The invention provides a control method, which is applied to an artificial intelligence experiment system, at least comprises a robot hardware platform, a controller, a wheeled robot chassis and an industrial mechanical arm, and the method comprises the following steps: starting an operation system and executing hardware self-inspection; loading a large language model service and a traditional AI model, wherein the traditional AI model comprises a speech recognition model, a target detection model and a semantic analysis model; a natural language instruction of a user is received, voice is converted into a structured text through a voice recognition model, an instruction intention is analyzed through a large language model and a semantic analysis model, robot control parameters are generated, and a multi-modal interaction control signal is obtained; based on the multi-mode interaction control signal, a camera is called to collect image data, the position and category of a target object to be grabbed by the robot are recognized through a target detection model, the moving path of the robot and the grabbing track of the mechanical arm are calculated in combination with laser radar data, and the wheeled robot chassis and the industrial mechanical arm are controlled to execute coordinated actions.

The invention relates to the related technical field of laboratory equipment, and discloses a laboratory intelligent management system based on a safety monitoring function, which comprises an experiment table, an operation table is arranged on the experiment table, a first shell is arranged at the upper end of the operation table, and a collection and treatment assembly is arranged in the first shell; an S-shaped channel can be formed in the middle of the interior of the second shell through a first inclined plate and a second inclined plate, so that the moving stroke of poisonous gas in the second shell is prolonged, and the treatment effect on the poisonous gas is improved; the conical cover moves downwards to be close to the position above a source where the harmful gas is generated, so that the toxic gas is prevented from being diffused into a laboratory; and finally, by reducing the width of an S channel in the second shell, the height of the multiple adsorption particles in the second shell is increased, the contact time of the toxic gas and the multiple adsorption particles is further prolonged, and the toxic gas treatment effect of the collecting and treating assembly is improved according to the amount of the toxic gas.

The utility model relates to the technical field of experimental equipment, and provides a reagent adding device which comprises a peristaltic assembly, an air pump, a first switch valve and a controller, the peristaltic assembly comprises a peristaltic pump, and an inlet of the peristaltic pump is communicated with a reagent bottle through an input pipe; an outlet of the peristaltic pump is communicated with the sample cup through an output pipe; an inlet of the air pump is communicated with air, and an outlet of the air pump is communicated with an inlet of the peristaltic pump through an exhaust pipeline; the first switch valve is arranged on the exhaust pipeline; the peristaltic pump, the air pump and the first switch valve are electrically connected with the controller, the controller controls the peristaltic pump to operate based on a target value, and after the target value is reached, the controller controls the peristaltic pump to stop, the air pump to start and controls the first switch valve to open. By controlling the operation of the peristaltic pump, the air pump and the first switch valve, the reagent adding amount can be accurately controlled, the reagent is prevented from being retained in the peristaltic pump and the output pipe, and the reliability and the accuracy of the reagent adding process are improved.

The utility model discloses a lift type anti-pinch back hanging unit, which relates to the technical field of laboratory accessories and comprises an outer cabinet body, an inner cabinet body, a lift control system and an anti-pinch control system, the lift control system controls the inner cabinet body to slide up and down relative to the outer cabinet body, and a detection element is arranged at the upper end of the outer cabinet body close to an opening. The detection element is connected with the lifting control system, when the detection element detects that a human body is close to the opening area, the detection element sends a signal to the lifting control system, when the lifting control system receives the signal, the lifting control system stops working, the inner cabinet body stops sliding, the purpose of preventing a moving part from being clamped is achieved, and the detection accuracy is high; the device can be triggered when a human body or an object is not clamped, so that the human body can be effectively prevented from being clamped or the object can be effectively prevented from being damaged; the mounting structure on the outer cabinet body is detachably connected with the experiment table, so that split transportation, daily maintenance and split purchase by a user according to needs are facilitated.

The utility model relates to the technical field of impeller detection, and discloses a detection device for centrifugal pump impeller processing, which comprises an operation table, fixed plates are arranged on the left side and the right side of the upper part of the operation table in a sliding manner, one side of each fixed plate is fixedly connected with a motor, and the output end of each motor is fixedly connected with a turntable. Connecting frames are fixedly connected to the corresponding sides of the rotating discs, sliding rods are fixedly connected to the interiors of the corresponding sides of the connecting frames, moving plates are slidably connected to the upper sides and the lower sides of the exteriors of the sliding rods, and driving assemblies are fixedly connected to one sides of the moving plates; and the driving assembly is used for opening after the movable plate is inserted into the impeller to fixedly support the impeller. According to the utility model, the impellers with different sizes can be stably supported, clamped and turned over, the comprehensiveness of the detection of the impellers is improved, the impellers are irradiated in all directions, whether the impellers are damaged or the processing quality is unqualified is detected, and the quality of the impellers is ensured.

The invention discloses an intelligent sampling workstation for a laboratory, which comprises a workbench, the top end of the workbench is fixedly connected with a shell, the front end of the inner top wall of the shell is fixedly connected with a shell, the shell is internally provided with an adjusting part, the adjusting part comprises a motor and two fixing rings II, the motor is fixedly connected in the shell, and the fixing rings II are fixedly connected in the shell. A limiting part is installed at the rear end of the shell, an auxiliary part is installed in the shell, a fixing cavity is formed in the top end of the workbench, a heating plate is arranged in the fixing cavity, water tanks are fixedly connected to the two sides of the top end of the workbench, and water pipes are arranged at the rear ends of the two sides of the top end of the workbench. The ultraviolet illuminating lamp is driven by the adjusting part fixed on the inner top wall of the shell to incline towards the left side, the front side, the right side and the rear side in sequence, so that the angle of the ultraviolet illuminating lamp is adjusted by 360 degrees, and the ultraviolet illuminating lamp can comprehensively irradiate and disinfect the surface of the workbench.

The utility model discloses an electrical engineering experiment workbench which comprises a workbench, supporting rods are symmetrically arranged on the two sides of the upper surface of the workbench, and the supporting rods can be adjusted front and back along the workbench; a plurality of mounting rods are arranged between the two supporting rods, the mounting rods can be adjusted up and down along the supporting rods, and the mounting rods are used for mounting various parts required by an experiment; a bearing table is arranged on one side of the workbench and can be adjusted up and down along the workbench. The supporting rods are arranged on the two sides of the working table, the mounting rods are arranged on the two supporting rods, and the mounting rods facilitate clamping of parts such as air switches or protectors and the like, so that the parts can be conveniently mounted on the mounting rods when used, and the parts are prevented from being disordered on the working table and occupying the space of the working table top at the same time; and the bearing table is arranged on one side of the working table and can be used for placing some large components for experiments, so that a large space of the working table is saved.

The disclosure relates to a method of preparing a sample in a charged particle microscope. The method comprises the steps of providing a sample carrier having a mechanical support contour and a grid member connected thereto. The method comprises the step of connecting said sample carrier to a mechanical stage device of the charged particle microscope. Additionally, the method comprises the step of providing a sample, for example a chunk-shaped or lamella-shaped sample and connecting said sample to the grid member of the sample carrier. The method allows, in an embodiment, easy and reliable transfer of a sample between a bulk sample and a sample carrier.

The modularized soil tank comprises side plate assemblies, waist frame assemblies, bottom plate assemblies and end face plate assemblies, the number of the waist frame assemblies is multiple, and each waist frame assembly comprises a U-shaped frame body, a gasket, a welding plate, a full-thread stud and an expansion screw; according to actual requirements, the U-shaped frame bodies of the corresponding number can be installed, then the bottom plate assembly is laid on a soil bin bottom support composed of the U-shaped frame bodies, then the end face plate assemblies and the side plate assemblies are installed, the soil bin with an opening in the top is formed, the height of the welding plate on the full-thread studs can be adjusted by rotating two sets of nuts, and the welding plate can be conveniently and rapidly welded. The overall length of the groove body is adjustable, the whole groove body is assembled through screws, disassembling, transferring and reassembling can be completed, a plurality of groove body modules are connected through the screws, groove bodies with the lengths of 12 meters, 18 meters and the like can be manufactured, use is flexible and convenient, and the soil groove is suitable for large-scale application and popularization.

The present application relates to the technical field of chemical experiment, and specifically relates to a chemical experiment table with chemical solution treatment function, which comprises a chemical experiment table composed of a table body, a water tank and a storage rack, a controller is arranged on the table body, the controller is signal connected with a touch display screen, neutralization cavities are symmetrically arranged in the middle of the table body, a PH sensor is arranged in each neutralization cavity, a fixing block is fixedly connected to the side wall of each neutralization cavity, vibration grooves are formed in the two sides of the inner wall of the table body, a neutralization pipe is slidably arranged in the middle of each neutralization cavity, a plurality of through holes are formed in the neutralization pipe, a waste liquid pipe is connected to the top of each neutralization cavity, a three-way pipe is connected to the bottom of each neutralization cavity, a collecting assembly and a sewage assembly are arranged at the other two ends of the three-way pipe respectively, and an auxiliary assembly is arranged in the vibration groove. The structure for preliminary neutralization treatment of chemical solution arranged below the chemical experiment table can avoid the leakage risk and high subsequent treatment cost caused by the temporary storage of the traditional experiment table relying on the collecting barrel.

The utility model discloses an intelligent experiment table. According to the intelligent experiment table, the accommodating cavity is formed in the mounting seat, and the wire inlet communicated with the outside is formed in the bottom wall of the accommodating cavity, so that the first wire of the external power supply can enter the accommodating cavity through the wire inlet; the electronic equipment is arranged on the mounting seat, and a second wire of the electronic equipment can be accommodated in the accommodating cavity; the side wall of the accommodating cavity is provided with the operation port communicated with the outside, the operation port is adjacent to the wire inlet equipment, and the second wire extends to the operation port, so that a user can stretch a hand into the accommodating cavity through the operation port to realize electric connection or disconnection between the second wire and the first wire, and furthermore, the user can conveniently use the wire inlet equipment. A user can more conveniently carry out electric connection or disconnection between the electronic equipment and the external power supply.

A multi-module marine experiment table capable of being spliced comprises an experiment table board face provided with a plurality of positioning holes, a plurality of pairs of sliding grooves are formed in the bottom of the experiment table board face, and each pair of sliding grooves divides the experiment table board face into independent experiment table areas; each experiment table area is movably connected with an experiment cabinet through a sliding groove, a sliding rail is arranged at the top of each experiment cabinet, each experiment cabinet comprises a drawer and a cabinet body, and pull ring locks are embedded in the drawers and the cabinet bodies. The experiment table surface is installed on a ship wall plate through a plurality of positioning holes and fixing pieces, and the experiment cabinet is movably installed below the experiment table surface through cooperation of sliding grooves and sliding rails and fixed to the ship wall plate through connecting holes and connecting pieces; the first, second and third experiment cabinets are movably mounted for multi-person experiment operation, so that the experiment efficiency is improved; universal wheels and pedal type brake pads are arranged at the bottoms of the first, second and third experiment cabinets, so that the experiment cabinets are convenient to move, and the experiment cabinets filled with different experiment samples can be quickly replaced.

The utility model relates to the field of activated carbon dust treatment, in particular to an operating table capable of preventing activated carbon dust from flying, which comprises a table top, a U-shaped baffle, a spraying mechanism and a collecting mechanism, the spraying mechanism comprises a conveying component and a plurality of atomizing nozzles, and the collecting mechanism comprises three water absorption tanks and three extraction components. Water can be conveyed to a plurality of atomization nozzles through the conveying assembly and sprayed out through the atomization nozzles, the atomization nozzles spray atomized water drops, the atomized water drops adhere to dust on an operation table, the dust falling effect is achieved, dust raising is effectively avoided, when the extraction assembly works, the inner wall of a water suction groove generates gravitation, and the dust falling effect is improved. Atomized water drops attached with dust are adsorbed into the collecting box to be collected, activated carbon dust on the surface of the table top can be effectively and automatically adsorbed and cleaned, and manual cleaning of workers is not needed.

The utility model discloses a chemical test agent processing workbench, and relates to the technical field of chemical test agent processing, connecting rods are symmetrically arranged on the upper surface of a separation net, and the upper ends of the connecting rods are connected with limiting plates; an adsorption box is further installed on the upper surface of the top plate, connecting pipes are symmetrically arranged on the lower surface of the adsorption box and located in front of the top plate, the lower ends of the connecting pipes are connected with air inlet pipes, air suction heads are symmetrically arranged on the lower surfaces of the air inlet pipes, and two adsorption frames are arranged in the adsorption box; and a deodorizing box is arranged between the two groups of adsorption frames in the adsorption box. Through the arrangement of the adsorption box, the air inlet pipe, the connecting pipe, the air inlet head, the adsorption frames, the odor removal box, the fan and the air outlet, odor generated by processing of a chemical test agent can be doubly adsorbed through the two adsorption frames, and meanwhile the odor removal box can be used for purifying air; therefore, the harm to workers caused by the odor generated during the processing of the chemical test agent is avoided.

The invention relates to the technical field of experiment tables, in particular to a physical experiment table which comprises a supporting column, an experiment main table is fixedly connected to the top end of the supporting column, and a rotary separation mechanism, a plugging cleaning mechanism, a pneumatic cleaning mechanism and a folding mechanism are arranged on the supporting column and the experiment main table; the rotary separation mechanism comprises a circular groove formed in the top end of the supporting column, a discharging pipe rotationally penetrates through the bottom end of the circular groove, the top of the inner wall of the discharging pipe is conical, and a cylindrical filter screen is fixedly connected to the top end of the discharging pipe. When the waste liquid is poured into the cylindrical filter screen, the waste liquid is firstly in contact with the conical baffle ring, is scattered through the conical baffle ring and is rotated to the cylindrical filter screen at the same time, the waste liquid is thrown onto the cylindrical filter screen at the moment, and is thrown out of the cylindrical filter screen through centrifugal force, so that the situation that the horizontal plane of the waste liquid rises is avoided, and the waste liquid can be poured and treated at a time; filtering treatment is continuously performed, and the waste liquid filtering efficiency is improved.

The utility model relates to the technical field of locomotive maintenance, in particular to a locomotive low-voltage equipment test bed, which comprises a test cabinet, a maintenance cabinet and a disassembly and assembly cabinet which are sequentially spliced to form a U-shaped structure. The equipment test bench with a concave structure is provided, so that a reasonable operation range and an operation platform can be provided for a whole set of experiments of testing, overhauling, dismounting and mounting of low-voltage equipment, the low-voltage equipment is prevented from being frequently transferred in a workshop, the working intensity of the low-voltage equipment experiment is reduced, and the experiment efficiency of the low-voltage equipment is improved. And actual working requirements are met.

The utility model discloses a table type automatic sample adding gun head placing device for a laboratory, and relates to the technical field of sample adding gun head placing. The top of the workbench is provided with a supporting assembly and a lifting assembly, the driving end of the lifting assembly is in power connection with the supporting assembly, the supporting assembly is internally provided with a spacing assembly, the bottom of the workbench is provided with a driving assembly, and the driving assembly is in power connection with the moving end of the spacing assembly. The sample adding gun heads can be linearly distributed through the supporting assembly, meanwhile, the sample adding gun heads in the supporting assembly can be distributed according to the blank spaces on the storage box through the spacing assembly, and the sample adding gun heads only need to be placed in the supporting assembly in the whole arrangement process; and then the driving assembly and the lifting assembly are driven respectively, so that the labor intensity is low when the sample adding gun heads are placed, and meanwhile, the placing efficiency is also improved.

The utility model discloses a waste liquid collecting structure of a clean bench, which effectively facilitates the dumping of waste liquid during the operation of the bench, and comprises a bench body, the front side of the bench body is fixedly connected with an operation bench, the left and right side walls of the bench body are fixedly connected with a connecting block, and the left and right side walls of the bench body are fixedly connected with the connecting block. A first liquid discharging channel is formed in each connecting block, a liftable baffle is arranged in each first liquid discharging channel, and a collecting barrel is detachably connected to the lower side of each first liquid discharging channel; the rear side of the first liquid discharging channel is communicated with a negative pressure channel used for providing negative pressure for the interior of the first liquid discharging channel. The liquid discharging device is novel in structure, ingenious in conception and easy and convenient to operate, effectively facilitates operation of workers, enables opening and closing of the blocking plate to be smoother, achieves a better sealing effect, reduces the risk of biological pollution, and is suitable for popularization and application. And the diffusion probability of the polluted aerosol is reduced.

The invention discloses an epidemic disease detection super-purification workbench for animal husbandry and veterinary medicine, and relates to the technical field of super-purification workbench cleaning. The animal husbandry veterinary epidemic disease detection super-purification workbench comprises a workbench body and a workbench top located in the workbench body, and further comprises an advancing device and a cleaning device, and the advancing device is used for driving the cleaning device to move in a reciprocating mode to clean the workbench top. The pressure of the scraping strip can be dynamically adjusted, the scraping rate of dry blood stains can be increased, the liquid spraying amount and the mixed concentration of a protease solution and clear water are automatically adjusted according to the cleaning level, the device adapts to stains of different degrees, the binding force of the stains and a table top is greatly weakened, assistance is provided for subsequent scraping of the scraping strip, and the working efficiency is improved. The cleaning effect of the working table top is effectively improved, the cleaning efficiency is improved, resource waste is avoided, and the use cost is reduced.

This utility model relates to the technical field of coating testing equipment, and discloses an ultraviolet accelerated weathering tester for powder coating testing. The machine includes a body, with slide rails fixedly installed on both sides of the body. A placement plate is slidably connected inside the slide rails, and a drainage hole is provided inside the placement plate. A lamp holder is fixedly installed on the inner top wall of the machine body, and an ultraviolet lamp is fixedly installed inside the lamp holder. A water tank is fixedly installed on the outer side of the machine body, and a heat exchange box is fixedly installed inside the water tank. This utility model has the following advantages and effects: placing ice packs inside the steel mesh cools the water in the tank, thus cooling the powder coating; activating the heating wire heats the water in the tank, thus heating the powder coating. Therefore, this device not only performs anti-aging tests on powder coatings but also reduces testing costs.

The utility model provides an engineering test bench, which relates to the technical field of engineering tests and comprises a support plate, four ends of the bottom of the support plate are all provided with support legs, two sides of the top of the support plate are both provided with three first fixing plates, and the six first fixing plates are equally divided into three groups. Damping devices are arranged on the inner sides of the three sets of first fixing plates correspondingly, a fixing box is installed on the tops of the three damping devices, and a rotating device is arranged in the fixing box. According to the utility model, the forward and reverse motor is electrically connected with the external controller, the whole equipment is placed on the horizontal ground and supported by the supporting legs, an object to be tested is placed on the top of the engineering test platform, and the object is subjected to engineering test by a worker; the two movable blocks move along the surface of the fixed rod in the opposite or opposite directions, and the connecting rod and the second U-shaped plate are pulled.

This utility model relates to the field of laboratory equipment technology, and in particular to a laboratory bench cabinet with a protective structure. The cabinet includes a laboratory bench with a guide rail at its front end, a slider on the upper side of the guide rail, positioning blocks on both sides of the upper end of the slider, and a transparent protective plate installed in the middle of each positioning block. Two sets of transparent protective plates are used. This utility model designs a laboratory bench cabinet with a protective structure, utilizing movable transparent protective plates. Experimenters can operate the equipment by passing their hands through circular holes. The protective plates can move towards each other and connect in the middle of the bench when needed, effectively preventing splashes from spreading to both sides during the experiment. Combined with protective baffles at the edge of the bench, this forms double protection, significantly reducing the risk of liquid or solid particles contaminating the bench or floor, or injuring experimenters, greatly improving the safety of experimental operations.

This utility model relates to the technical field of pesticide residue detection in agricultural products, and in particular to a pesticide residue detection device for agricultural products. The device's height can be adjusted according to actual conditions to facilitate use by personnel of different heights, providing convenience for personnel detecting pesticide residues in agricultural products. It includes a housing, inside which is a PLC controller. The top of the housing has a display screen and buttons electrically connected to the PLC controller. A stirrer is detachably connected to the housing. Four sets of guide rods are symmetrically fixed at the bottom of the platform, and each of the four sets of guide rods has a sliding support leg. A positioning frame is fixedly connected to the top of the platform. Rubber clips are symmetrically fixed to the inner walls of the left and right sides of the positioning frame. The housing is secured to the positioning frame by engaging with the rubber clips. The bottom of the housing contacts the top of the platform. Two sets of support plates are fixedly connected to the bottom of the platform, and a transmission worm gear is rotatably mounted on the two sets of support plates for adjusting the height of the platform.

The utility model provides a front-end processing work station, and relates to the technical field of detection equipment. According to the front-end processing work station, an experiment table is provided with a vessel containing area, the vessel containing area is used for containing a detection container, a robot, a constant volume instrument and a cover opening and closing machine are fixed to the experiment table, a pipette module, the constant volume instrument and the cover opening and closing machine are sequentially arranged in the circumferential direction of the robot, and the cover opening and closing machine is located beside the vessel containing area; the pipette module, the peristaltic pump module and the constant volume instrument are adjacently arranged on the experiment table; the operation end of the robot is used for picking up the detection container from the vessel placement area and transferring the detection container to the pipette module, the peristaltic pump module and the constant volume instrument for preset operation, and the cover opening and closing machine is used for opening a cover of the detection container picked up by the robot and closing the cover of the detection container after constant volume. According to the front-end processing work station, manual participation is not needed in the whole process, the mechanization degree is high, the manual participation degree of front-end processing in the detection link can be reduced, and the detection efficiency of follow-up detection can be improved.

The utility model belongs to the technical field of medical instruments, and particularly relates to an on-site rapid pathology operation platform which comprises a machine frame, a base, universal wheels arranged at the four corners of the bottom of the base, a box body arranged at the top of the base, a workbench arranged at the top of the box body and a conveying mechanism arranged at the top of the workbench. The flaking assembly comprises a bracket arranged on one side of the top of the workbench, a coloring agent storage tank arranged on the top of the bracket and a dyeing spray head arranged at the bottom of the coloring agent storage tank, and the dyeing spray head is located over the conveying mechanism; the film reading assembly comprises a hinge frame arranged on the other side of the top of the workbench, an electron microscope arranged on the hinge frame and a carrying plate arranged on the top of the workbench, and the carrying plate is located under the electron microscope; the novel film reading device is reasonable in structure, can be used for quickly preparing and reading films on site in the use process, is beneficial to improving the diagnosis efficiency, and can reduce the working intensity of medical personnel.

The utility model discloses an experiment table with protection for chemical experiments, which relates to the technical field of safety protection and comprises a table frame, a reserved inner groove is formed in the top of the table frame, a moving plate is arranged in the reserved inner groove, and a pneumatic cylinder and a telescopic rod are fixedly mounted between the moving plate and the table frame. A flow guide box body is fixedly embedded in the top of the table frame, a plurality of small air exhaust holes are formed in the flow guide box body, and the flow guide box body is communicated with an air exhaust pump; an air extracting pump extracts air from the interior of the flow guide box body through a connecting pipeline, a combiner box body and two air extracting pipelines, and a plurality of small air extracting holes form a negative pressure area at the top of an inner cavity of the reserved inner groove when extracting air from the interior of the reserved inner groove, so that air generated by a chemical experiment in the reserved inner groove is prevented from escaping to the periphery of the table frame; and a user is prevented from inhaling gas generated by an experiment.

The utility model discloses an adjustable laboratory workbench which comprises a test bed bottom cabinet, the top of the test bed bottom cabinet is fixedly connected with a transverse seat, the inner walls of the two sides of the transverse seat are symmetrically and rotatably connected with two bidirectional screw rods, and a synchronous driving assembly is jointly installed between the two bidirectional screw rods. The outer surfaces of the two bidirectional screws are symmetrically sleeved with two sliding blocks in a threaded mode, and the tops of the four sliding blocks are rotationally connected with connecting rods. According to the utility model, through the arrangement of the transverse plate, the fixed seat, the one-way screw rod, the sliding seat and the manual driving piece, the use height of the placement rack can be reduced when needed, so that an experiment operator can take articles at a higher position of the placement rack, and the overall practicability is improved; and through the arrangement of a synchronous driving assembly, a transverse seat, a bidirectional screw rod, a sliding block, a connecting rod and a supporting block, the height of the table top of the test table can be adjusted according to the use requirements of experiment operators, so that the requirements are met, and the overall practicability is further improved.