31results about How to "Will not affect the experimental results" patented technology

The invention discloses an experimental dog fixing device. The device comprises a movable frame, a lower layer support plate and an upper layer frame, wherein the lower layer support plate is arranged at lower part of the movable frame, and the rear end of the lower layer support plate is hinged with the rear end of the movable frame; the upper layer frame is arranged at the upper part of the movable frame and is positioned above the lower layer support plate; the rear end of the upper layer frame is hinged with the rear end of the movable frame; a piece of canvas used for holding an experimental dog is laid on the upper layer frame; a two-way zipper is arranged on the canvas along the front and back direction, and the canvas is also provided with four locating holes which are respectively used for locating the four limbs of the experimental dog; the upper layer frame is also provided with binding belts used for fixing the body of the experimental dog. The experimental dog fixing device provided by the invention is firm in experimental dog fixation and convenient to operate, reduces the number of assistants needed by an experiment, enables experimental data to be stable and reliable, and increases the working efficiency.

The invention discloses a waste gas treatment system for detecting heavy metals in food. The system comprises a waste gas cavity, wherein an adsorption chamber is formed in the upper part of the waste gas cavity, the bottom of the waste gas cavity is connected with a reaction ball chamber, a plurality of calcium oxide adsorption layers are arranged in the adsorption chamber, each calcium oxide adsorption layer comprises a fiber skeleton and calcium oxide applied to the fiber skeleton, and the fiber skeletons are wound into a spiral line structure by a fiber bundle; a conical chamber is formed in the lower part of the waste gas cavity, and the bottom tip end of the conical chamber is in sealed communication with the reaction ball chamber; the system further comprises an air circulation device which comprises a pipe, one end of the pipe is communicated with the upper part of the adsorption chamber, the other end extends into the reaction ball chamber, an air pump is arranged on the pipe, and the pipe is further connected with a first branch pipe and a second branch pipe. Adsorption and digestion are performed in a closed environment in a fully sealed form, so that the waste gas cannot leak, and little harm is caused to the environment and human bodies. The reaction digestion condition can be clearly observed through the waste gas chamber and the reaction ball chamber which are made of transparent glass.

The invention relates to the field of experiment teaching, in particular to a dropper. The dropper comprises a cutting sleeve, a rubber head, a dropper body, a suction nozzle, a placement groove, a quantitative cap and a limiting piston. The cutting sleeve is arranged on the top of the rubber head. The bottom of the rubber head is connected with one port of the dropper body, and the other port of the dropper body is connected with the suction nozzle. The dropper body is composed of two arc glass sheets and two elastic sliding rails. The arc glass sheets and the elastic sliding rails are arranged in a spaced mode and connected in sequence to form the cylindrical dropper body. The limiting piston is arranged inside the dropper body. The outer diameter of the limiting piston is equal to the inner diameter of the dropper body. Scale marks are engraved in the arc glass sheets in the axial direction of the dropper body, and a plurality of clamping lock pieces are arranged on the elastic sliding rails; the placement groove and the quantitative cap are arranged at the upper portion of the dropper body; the plane where a notch of the placement groove is located is perpendicular to the dropper body and faces the suction nozzle; the quantitative cap is installed inside the placement groove. The dropper can achieve convenient quantitative liquid sampling, can lower the probability that fingers of a person are corroded by corrosive liquid, and is safe and practical.

The invention relates to the technical field of oilfield chemistry, in particular to an artificial core preparation method for simulating irregular natural fractures in a cement sheath of a water well containing ternary composite flooding, and solves the problems of uncontrollable direction and distribution of fractures in cement rock samples, poor fracture connectivity and difficulty in simulation real problems on the spot. The steps are: 1. After the heavy cement slurry is solidified, it is broken into pieces of cement with appropriate volume and irregular shape; 2. Heat and melt the vaseline and immerse the cement pieces in the vaseline solution, so that the vaseline is wrapped on the surface of the cement block; 3. Treat the Put the pasted cement fragments into the mold, and inject light cement slurry into it; 4. After the cement slurry is solidified in the mold, heat it again to melt the vaseline inside, and the vaseline seeps out to form irregular cracks; 5. Form the mold into The cement sheath crack channeling model of the invention is cast with epoxy resin, and interfaces are left at both ends of the pouring model; the invention can form cement sheath channeling cracks in various forms, which are used for oil well cement sheath channeling simulation experiments in laboratories.

An asymmetric clamping device and experimental method for sheet compressing are provided; two clamp plates of the asymmetric clamping device are positioned in retaining grooves in a center spring support baseplate, lateral pressure is applied to a sheet through the clamp plates and sliders such that the sheet wrinkles in the thickness direction and loses stability in the width direction; two return springs are each fixed between the corresponding clamp plate and slider; tension springs are connected to the lateral sides of the two clamp plates to provide uniform symmetric pressure for the clamp plates; lateral pressure is applied through the springs, a sample is given planar clamping force through the clamping device, the sample is kept moving evenly in the thickness direction, it is guaranteed that a clamping gap may automatically adjust with changes in sheet thickness; a slider movement area is positioned in a sample non-standard distance segment, the transverse frictional force on the sample may not affect a standard distance segment, and the impact of slider movement induced width-directional frictional force upon experimental results is eliminated; the invention provides three travel options, and various sheet tensioning and compressing experimental needs can be met.

The invention belongs to the field of steel structure buildings, and in particular relates to a reciprocating load loading device for automatically controlling axial force bearing members and a use method thereof. Including the external frame fixing device, the external frame fixing device is provided with a sample loading device for loading the test piece, and the sample loading device is connected with a data acquisition system; the external frame fixing device is provided with a second beam and a third beam; The specimen loading device includes a horizontal actuator, a horizontal load sensor and a connecting rod. The horizontal actuator and the horizontal load sensor are respectively connected to the data acquisition system. The left end is fixedly connected to the second beam, and the right end is connected to the test piece through the first connecting hinge. The left end of the to-be-tested piece is fixedly connected to the horizontal load sensor, the horizontal load sensor is connected to the connecting rod for relative rotation, and the connecting rod is hinged to the third beam through the second connecting hinge; the horizontal actuator, the to-be-tested piece, and the horizontal load The sensor and the connecting rod are coaxial and horizontal, and the structure is simple, which is convenient for transportation and placement.

The invention discloses a load-bearing device comprising a spiral spring and a plurality of weights, wherein the diameter of the spiral spring is sequentially reduced from an upper end to a lower end; the outer wall of the spiral spring is provided with a plurality of fixed rings; and the plurality of weights are respectively placed in the plurality of fixed rings. The load-bearing device is easy to operate, can be conveniently and fast assembled or disassembled during experiments and firmly fixed after being assembled, and can conveniently, fast and accurately regulate the total weight, thereby ensuring the repeatability and the scientificity of the experiments.

The invention discloses a device and application for preparing metal semi-solid slurry, and belongs to the technical field of material science. The device is composed of a smelting furnace, a rotating stick induction nucleation system, a rotating magnetic field generator and a crystallizer. After being preheated to the preset temperature, overheated metal melt passes through a pouring gate to be right opposite to a rotating stick to pour the rotating stick, under the action of the tangential force of the rotating stick, molten metal is spread out by surrounding the rotating stick to form a melt thin film, the whole melt is undercooled, and a large amount of nucleation of a primary phase inside the melt thin film is induced; due to the existence of a magnetic field, a liquid film is evenly spread around the rotating stick, and even undercooling is generated; after being temporarily spread out, the melt thin film flies away from the rotating stick, the primary phase is prevented from further growing, and finally small and spherical or similarly spherical microstructures are obtained. According to the device, the round semi-solid alloy slurry of the even structures is obtained by controlling the temperature and the flow rate of the metal melt, the rotating speed of the rotating stick and the current of the magnetic field generator.

The invention belongs to the technical field of animal experiment devices, and discloses an anesthesia fixation device for experimental animals, which is provided with an anesthesia table, and the two ends of the side of the anesthesia table are fixed with a limb fixator by nuts, and the inside of the limb fixator is equipped with an automatic retracting device through screws The upper end of the limb fixer is provided with a fixing groove, the surface of the automatic retractor is wrapped with a fixing belt, and the upper end of the fixing belt passes through the fixing groove; the front end above the anesthesia table is fixed with a head fixing device through a nut, and the surface of the anesthesia table is embedded with a head fixing device. Equipped with a partition net, a partition is arranged inside the anesthesia table, and a movable box is clamped inside the partition. The present invention can conveniently adjust the length of the fixing belt. Through the abdominal fixing belt with an opening, the body can be effectively fixed without affecting the operation experiment on the abdomen of the animal. The upper surface of the anesthesia table is embedded with a partition net. , It can discharge animal excrement and other missing liquids into the movable box in time, which is convenient for later cleaning.

The invention discloses a device guide wire connector. The device guide wire connector comprises a metal columnar plug, a metal columnar connection piece and an insulation pillar, wherein a plurality of strip-shaped copper sheets are evenly distributed on the surface of the metal columnar plug, each copper sheet is 2-4mm longer than the metal columnar plug, two ends of each copper sheet are respectively fixed with two ends of the metal columnar plug, a copper core is arranged in the insulation pillar, a toggle switch is arranged at one end of the insulation pillar, the other end of the insulation pillar is provided with a metal jack hole, one end of the copper core is connected with one end of the metal columnar connection piece, the other end of the copper core is divided into two paths, one path is connected with the metal jack hole, the other path passes out of the insulation pillar and forms a device guide wire, and the other end of the metal columnar connection piece is connected with the metal columnar plug. The device guide wire connector can achieve a stable connection between two device guide wires by adopting the special structure formed by arranging the copper sheets on the metal columnar plug and using the toggle switch, a rubber ball and an annular groove structure, and can prevent the problem that an experimental result is influenced due to loosening of the connection of the two device guide wires or bad contact of the two device guide wires especially in an experimental operation.

The invention relates to a visualized test bench for testing hydraulic valve performance, relating to the field of hydraulic valve performance testing devices, and aiming at solving the problems that the condition of runner flow field of a valve cannot be effectively known, and the experimental valve pressure flow condition is uncontrollable during the experimental process when the test bench in the prior art is used. The visualized test bench for testing hydraulic valve performance comprises a fuel tank, a hydraulic pump No. 1, a pressure gauge, a speed regulating valve, a pilot-type constant pressure reducing valve, a pressure sensor No. 1, a visualized experimental valve, a pressure sensor No. 2, a pilot type relief valve, a flow sensor, a temperature sensor, an electromagnetic reversing valve, a cooler, a hydraulic pump No. 2 and a heater. The visualized test bench is mainly used for the hydraulic valve performance testing process, and an operator can conveniently observe the condition of the runner flow field when the valve is working.

The invention discloses a high-temperature rock sample strain and sound wave testing device and testing method. The device is mainly composed of a sound wave emitting end, an upper pressure bearing shaft, a corundum thimble, an upper displacement slide, a lower displacement slide, a heat insulation shell, a carbon fiber sleeve, and a rock sample. , lower bearing shaft, acoustic wave receiving end, lower copper electrode, perlite powder, temperature sensor, transformer, temperature-acoustic control box, oscilloscope, upper copper electrode, data acquisition and processing system. The method includes: (1) installing the device on the stroke of the uniaxial mechanical testing machine; (2) heating the rock sample; (3) performing a compression test; (4) the difference between the upper displacement slide and the lower displacement slide is is the axial strain value of the rock sample; (5) The sound wave is emitted from the sound wave transmitter, and is received by the sound wave receiver after passing through the rock sample, and the sound wave time difference of the rock sample is obtained; (6) Various data are collected and stored. The invention is reliable in principle, easy to operate, can obtain the mechanical parameters of rocks at high temperature in real time, and has broad market application prospects.

The invention relates to an animal fixing box for pharmacological teaching. The animal fixing box comprises a box body (1), wherein a head perforation (3) is arranged in the box body (1); a containingbox (11) for containing animal bait is arranged on the box body (1); a head fixing mechanism, a body fixing mechanism and a front limb fixing mechanism and a rear limb fixing mechanism are further mounted on the box body (1); and a controller (29) is further installed on the box body (1), and the animal fixing can be realized under the control of the controller (29). An animal can be firmly fixed, and the fixing process is automatically realized.

The invention provides a mixed paraffin, a method for storing PCR reaction reagents using the mixed paraffin, and a PCR reaction kit containing the mixed paraffin. The mixed paraffin is uniformly mixed with liquid paraffin and melted solid paraffin, wherein , the solid paraffin is selected from the solid paraffin whose melting point is higher than 50° C., and the ratio of the solid paraffin to the liquid paraffin is 1:4 to 1:12 (w / v). The melting point of the mixed paraffin of the present invention is between 27-38 DEG C, and is used for isolating enzymes and other components in the PCR reaction solution. The melting point is moderate and does not affect the effect of fluorescent quantitative PCR reaction. Moreover, the method for producing mixed paraffin in the embodiment of the present invention is simple and low in cost.