44results about How to "Avoid Measuring Inaccuracies" patented technology

The present invention belongs to the orifice plate gas flow measurement technical field and relates to a high-pressure orifice plate gas stagnation temperature control device and method. The control device is a temperature control gas tank; a temperature control gas tank inlet flange is externally connected with the outlet of a gas source; a front porous rectifying plate is clamped to a temperature control gas tank wall through a temperature control gas tank inlet expanding type clamp plate flange by means of bolts; electric heating rods are fixedly clamped to a rear porous rectifying plate through the front porous rectifying plate; line collection rings are located on the rear porous rectifying plate; electrode springs are clamped between electric heating rod inner electrodes and external electrodes; the external electrodes are embedded in insulating materials; the insulating materials are embedded in metal plugs; the metal plugs are welded to ball head-taper surface sealing structures; the ball head-taper surface sealing structures are welded to the temperature control gas tank wall; and outer periphery flow guiding holes and inner periphery flow guiding holes are located on the rear porous rectifying plate. With the high-pressure orifice plate gas stagnation temperature control device and method of the invention adopted, gas temperature at the inlet of an orifice plate can be effectively compensated in a certain range, the accuracy of key parameter measurement participating in the calculation of the discharge coefficient of the orifice plate can be ensured, and the accuracy of the calibration of the discharge coefficient of the orifice plate can be improved.

The invention discloses a chemical analysis method for copper phase in copper concentrate, which belongs to the field of chemical analysis. The method comprises the following steps: S1 separating the water-soluble copper in the copper concentrate to be tested, and determining the content of the water-soluble copper by atomic absorption method; S2 separating the copper oxide in the filter residue A obtained in step S1, and measuring the content of copper oxide by atomic absorption method; S3 separates the natural copper in the filter residue B obtained in the step S2, and adopts atomic absorption method to measure the content of natural copper; S4 separates the copper sulfide in the filter residue C obtained in the step S3, adopts a titration method to measure the content of copper sulfide; wherein, the The step of separating copper sulfide in the step S4 includes: first heating and dissolving filter residue C with dilute nitric acid, then adding dilute sulfuric acid to continue heating and decomposing, then evaporating the solution to dryness, adding dilute sulfuric acid to heat and dissolve to obtain a mixture of copper and iron, and then masking Iron and the titration method was used to determine the content of copper sulfide. Adopting the method of the invention avoids the use of highly toxic liquid bromine, and the determination process is safer.

The invention discloses a mobile concrete mixing station for road and bridge construction, which belongs to the technical field of building construction equipment, and includes a mixer, a material weighing device and a water tank, which can be placed on the transportation equipment for transfer, and the material feeding port of the mixer is connected with the material weighing A screw conveyor is arranged between the devices, and the water tank is connected to the mixer through a water pump and an inlet pipe with a flow meter. The material weighing device includes a storage hopper with a dynamic weighing and metering module at the bottom, and the storage hopper is connected to the turning mechanism; the mixer includes Tank body, stirring shaft and stirring blades, the stirring shaft is vertically arranged in the tank body, the motor driving the stirring shaft is arranged at the bottom of the tank body, and a plurality of stirring blades are radially arranged around the stirring shaft from top to bottom. The dynamic weighing and measuring module weighs various powdery or solid materials, and the flow meter measures the water consumption for mixing; when the materials are weighed, the turning mechanism and the screw conveyor are started to transport the materials to the tank for mechanical stirring and mixing. The material measurement of the invention is accurate, and the concrete quality is guaranteed.

The invention discloses a device for detecting the flatness and tensile strength of sewing parts, which relates to the technical field of textile cloth production; in order to solve the problem that only the cloth can be detected but the cloth after sewing cannot be tested for pulling resistance and flatness; it specifically includes A fixed seat, the side wall of the fixed seat is welded with a motor table, the top of the motor table is fixed with a motor through a bolt, the output shaft of the motor is connected with a lead screw through a coupling, and one end of the lead screw is fixed with a stopper through a bearing. The block is welded to the inner wall of the fixed seat, the outer wall slider of the lead screw is connected with a movable frame, one side of the top of the fixed seat is welded with a fixed frame, the top of the outer wall of one side of the fixed frame is provided with a fixed clamping frame, and one side of the movable frame is The top of the outer wall is provided with a movable clamping frame. The present invention provides a fixed clamping frame and a movable clamping frame with a rectangular sheet structure, so that the clamping range is large, so that the clamping position can be adjusted according to requirements, and the flexibility of equipment use is improved.

The invention relates to insoluble sulfur, a preparation method thereof, oil-charged insoluble sulfur and application of oil-charged insoluble sulfur. According to the application, ionic liquid is taken as a stabilizer of the insoluble sulfur and is particularly taken as the stabilizer of raw material sulfur melt polymerization reaction, so that the heat stability of the prepared insoluble sulfur can be obviously improved. Particularly, when ionic liquid is taken as the stabilizer for use in the raw material sulfur melt polymerization reaction, the stability of the final prepared insoluble sulfur at 105 DEGC / 15min can reach above 75%, and the stability of the final prepared insoluble sulfur at 120 DEGC / 15min can reach above 40%.

The application provides an oil field single well metering device and a metering method. The device includes: a metering tank and an energy storage tank that communicate with each other, the gas of a preset pressure is stored in the energy storage tank, and the metering tank is provided with a liquid inlet pipeline, a liquid level gauge, a liquid outlet pipeline, Weighing module, the inlet valve is provided on the liquid inlet pipeline, and the outlet control valve is arranged on the outlet pipeline; the inside of the metering tank is also provided with a piston for cleaning the metering tank, and the bottom of the metering tank is connected to There is a cleaning device, and the cleaning device is used to inject cleaning liquid into the metering tank. The various embodiments in the present application have simple structure and convenient operation, and realize metering of single well in oil field without external power, and improve the accuracy of metering results of single well.

An optical system for measuring human eye white-to-white distance comprises a first optical system and a second optical system, wherein the first optical system is composed of a double-light-emitting light source, a double-path diaphragm, a first lens, a dichroscope and an eye lens on a light path in sequence; the second optical system is composed of the dichroscope, a second lens and an iris pickup device on the light path in sequence. The double-light-emitting light source transmits through the first lens after passing the double-path diaphragm, a part of light beams transmit the dichroscope, enter human eyes through the eye lens and focus on the irises of the human eyes. A part of light beams is reflected by the irises, transmits to the eye lens, is reflected by the dichroscope and then transmits to the second lens, and finally images on the iris pickup device. The double-light-emitting light source is arranged on one of focal planes of the first lens, another focal plane of the first lens is superposed on one of focal planes of the eye lens. By the aid of the optical system and the optical method, parameters such as the eye white-to-white distance and the pupil diameter can be accurately measured.