37results about How to "Same test conditions" patented technology

The invention discloses a detection system for air tightness of a valve. The system comprises a water tank, a water tank bracket, upper and lower pneumatic cylinders, a manipulator bracket, a plurality of manipulators and a manipulator transmission mechanism, wherein a water channel, a water inlet cylinder and a plurality of valve clamping fixtures are arranged in the water tank; the valve clamping fixtures are connected with the water inlet cylinder; the water tank bracket is fixedly arranged on the upper side of the water tank; the upper and lower pneumatic cylinders are arranged on the water tank bracket; the manipulator bracket is connected with piston rods of the upper and lower pneumatic cylinders; the manipulators are ranged on the manipulator bracket; each manipulator comprises a main shaft, a manipulator cylinder, a manipulator clamp and two clamping arms; the main shafts are provided with transmission gears; the manipulator cylinders are connected with the main shafts; the manipulator clamps are fixedly connected with the manipulator cylinders; the clamping arms are hinged in the manipulator clamps; one end of each clamping arm is hinged to the piston rod of the manipulator cylinder through a connecting arm respectively; the manipulator transmission mechanism comprises a transmission cylinder and a rack which is fixedly connected to the transmission cylinder; each transmission gear is engaged with the rack. The system can realize that the opening angle of a to-be-tested valve at each station is consistent to guarantee consistent testing condition of each to-be-tested valve and further achieve a more accurate test result.

The invention discloses a method for detecting the oil-well cement expansion rate, and belongs to the technical field of cement preparation. The method comprises the steps of slurrying, mould filling and curing and demoulding. The method is characterized by further comprising the steps of initial measurement, age period measurement and expansion rate calculation, wherein the curing and demoulding step comprises the process that a cement test block is put into a curing box, and demoulding is conducted after curing is conducted; the initial measurement step comprises the process that the direction of the cement test block subjected to demoulding is marked, then the cement test block is put into a measuring device subjected to zero correction, and the initial length L<0> of the cement test block is measured; the age period measurement step comprises the processes that the cement test block subjected to initial measurement is put into the curing box to be cured continuously, and the length L<x> of the corresponding age period is measured after the corresponding age period is achieved; the expansion rate calculation step comprises the process that the expansion rate is calculated according to the formula shown in the description, wherein 250 represents the effective length of the cement test block. According to the method for detecting the oil-well cement expansion rate, the expansion rate of the cement test block can be tested at different environmental temperatures, the testing data error can be reduced, and the measurement precision and accuracy of the expansion rate of the cement test block can be improved.

An insulation performance test device for EMU roof insulators in a complex environment. There are four chambers from left to right: the stable chamber, the low-speed test chamber, the high-speed test chamber and the expansion chamber, and the left side of the stable chamber and the aerosol generator The nozzles of the low-speed test chamber are connected to each other, and the upper part is provided with a funnel; there are roof insulators in the low-speed test chamber, and the upper end of the roof insulator is connected to a high-voltage power supply; the upper surface of the inner wall of the low-speed test chamber is equipped with an ultraviolet There is a glass observation window at the top; a negative pressure fan and an anemometer are installed at the right end of the expansion chamber. The test environment is close to the actual operating environment of the roof insulator, and the test results are more accurate and reliable. At the same time, it can also test and analyze the relationship between various environmental factors and the insulation performance of the roof insulator. So as to provide a more reliable and accurate test basis for the design, manufacture and maintenance of the roof insulator, and better ensure the safe operation of the train.

The fast detection device for microwave ceramics includes an opening parallel plate resonant cavity with step motor, a SCM, a driver for motor, a VNA, and a computer. This invention can detect target dielectric properties with no harm and high precision.