11results about How to "Measure security" patented technology

The invention belongs to the technical field of concentration measurement of flammable and explosive gas, and particularly relates to an on-line measurement device for hydrogen concentration in a containment vessel for a nuclear power plant. Comprising a hydrogen sensor installed in a containment and a secondary measurement and control system installed outside the containment, and the hydrogen sensor is connected with the secondary measurement and control system. An upper protective breathable layer is arranged on the mounting fixing frame, a lower protective breathable layer is arranged below the mounting fixing frame, an upper protective cover is arranged on the upper protective breathable layer, and a lower protective cover is arranged below the lower protective breathable layer; the first temperature measuring sensor is close to the electric heating element and fixed to the center of the upper protective cover, and the distance between the second temperature measuring sensor and the first temperature measuring sensor is 20-30 mm. The continuous measurement of the hydrogen concentration in the containment vessel under the accident condition of the nuclear power plant can be safely and reliably realized.

The invention discloses a wind tunnel model path planning method based on multiple motion mechanisms, is used for designing operation paths of an airplane model and an external store model in a grid force measurement test of the multiple motion mechanisms, realizes that the airplane model and the external store model efficiently and safely complete all grid points, and belongs to the technical field of grid force measurement wind tunnel tests. Comprising the following steps: (1) establishing a motion simulation model of a motion mechanism, a test model and a wind tunnel; (2) designing a plurality of paths with different motion sequences according to the distribution of test grid points of each test model; (3) setting the movement mode of the movement mechanism to be simultaneous movement at the maximum running speed, then carrying out analogue simulation on a plurality of paths, selecting a path A and a path B which consume less time in the first two as to-be-selected paths, and assuming that the path A is the path which consumes the shortest time; and (4) carrying out collision detection simulation on the path A and the path B, and determining a final test implementation path.

The utility model relates to the technical field of measuring calipers, in particular to a floor thickness measuring caliper, which comprises a main telescopic rod, an auxiliary telescopic rod and a U-shaped clamp body, the telescopic end of the main telescopic rod is provided with the U-shaped clamp body, the main telescopic rod is provided with a fixed block, the fixed block is provided with a second rod hole, and the auxiliary telescopic rod is arranged in the second rod hole in a penetrating manner. A clamping plate is installed at the telescopic end of the auxiliary telescopic rod and used in cooperation with the U-shaped clamp body, a sliding block is installed at the fixed end of the auxiliary telescopic rod, a third rod hole is formed in the sliding block, the fixed end of the main telescopic rod penetrates through the third rod hole, thickness scale marks are arranged on the outer wall of the main telescopic rod, and an observation opening is formed in the position, right opposite to the thickness scale marks, of the sliding block. According to the utility model, personnel can conveniently adjust the height of the measuring caliper according to the height of the floor, so that the thickness measuring requirements of floors with different heights can be met, the personnel do not need to climb to measure, and the measuring process is safer.

The utility model discloses a transformer sound level measurement auxiliary device, which comprises a plurality of sound level probes used for acquiring sound signals of a transformer, and further comprises a probe bearing frame covering the periphery of the transformer, and the plurality of sound level probes are arranged along the circumferential direction of the probe bearing frame. The sound level probes are located on the same horizontal plane, and the distances from the sound level probes to the outer surface of the transformer are equal. According to the utility model, the problem of inconsistent measurement distances caused by positioning deviation in traditional manual measurement is effectively solved, and the accuracy and reliability of measurement data are ensured; secondly, the sound level meter does not need to be held manually or the position of the measuring head does not need to be adjusted frequently, the electric shock safety risk possibly faced by manual operation under the electrified working condition is greatly reduced, and the personal safety of operators is guaranteed; and multiple measuring points can be measured at the same time, so that the condition of long time consumption of a single test caused by manual switching measurement of multiple measuring points in the prior art is changed, and the detection efficiency is greatly improved.

This invention discloses a high-speed train impedance measurement method based on adaptive broadband voltage disturbance. It eliminates the influence of frequency overlap effects on impedance measurement during broadband disturbance injection in VSC-type high-speed trains by using odd-even segmented multi-frequency disturbance signals. Simultaneously, it incorporates a disturbance generation device for adaptive broadband disturbance control. Besides generating odd-even segmented multi-frequency voltage disturbances for VSC-type high-speed train impedance measurement, this invention can adaptively adjust the frequency resolution by evaluating the fluctuation level of the impedance amplitude-frequency characteristic curve, improving the measurement accuracy in frequency bands with large impedance curve fluctuations. Furthermore, it can adaptively adjust the disturbance amplitude based on the DC-side voltage fluctuation of the disturbance generation device, preventing excessive disturbances from affecting the normal operation of the system and thus ensuring measurement safety.

The utility model discloses a novel channel flow velocity measuring device, which belongs to the technical field of water conservancy projects and is technically characterized by comprising a fixing assembly and a limiting assembly. According to the utility model, when the flow velocity of the water flow in the farmland channel is measured, the fixing assembly can be fixedly arranged in the channel, then the measuring assembly can be inserted into the fixing assembly, and the measuring device can be extruded and clamped by rotating the adjusting piece, so that the flow velocity of the water flow in the farmland channel can be measured. In this way, the measuring assembly can be stably arranged in the fixing assembly, the position of the measuring device cannot be changed when water flow impacts the measuring device during flow velocity measurement, and in the using process, in order to avoid rotation of the measuring device, a limiting assembly can be arranged in a channel, and the measuring device can be conveniently and rapidly fixed. The measuring assembly is connected with the limiting assembly, so that the angle and the position of the measuring device can be kept unchanged.

A state-of-charge indicator device for a redox flow battery system, the state-of-charge indicator device having a reference cell device for measuring a potential difference between a positive electrolyte and a negative electrolyte and an auxiliary reference electrolyte device, the auxiliary reference electrolyte device comprising a separate auxiliary electrolyte reservoir, the invention relates to a reference cell device comprising an auxiliary reference electrolyte reservoir for accommodating a redox electrode associated with a reference electrolyte, means for measuring the potential difference between the auxiliary reference electrolyte and the electrolyte of the reference cell device, and an ion channel conduit connecting the auxiliary reference electrolyte reservoir and the electrolyte of the reference cell device, the ion channel conduit being configured to have a low fluid diffusivity, wherein the conduit comprises a wicking device for absorbing the electrolyte and maintaining an ionic connection between the respective electrolyte of the auxiliary reference electrolyte reservoir and the reference cell device.

The present invention relates to the field of cultural relics collection, and specifically discloses a method for detecting ventilation rate of cultural relics display cabinet based on CFD, comprising the following steps: S1, drawing a three-dimensional model of the cultural relics display cabinet; S2, recording the experimental detection results of the temperature and humidity outside the cabinet and the experimental detection results of the carbon dioxide concentration in the cabinet changing with time from the starting time; S3, obtaining the numerical detection results of the carbon dioxide concentration in the cabinet changing with time; S4, obtaining the three-dimensional CFD model of the display cabinet calibrated with carbon dioxide; S5, selecting a tracer gas with a molecular mass close to that of air, and obtaining the numerical detection results of the tracer gas concentration in the cabinet changing with time; S6, obtaining the ventilation rate of the display cabinet by function regression. The present invention uses a gas with a molecular mass closer to that of air as a tracer gas under the premise of accuracy, convenience, low cost, and harmlessness to people and the environment, and realizes the detection of the ventilation rate of the museum cultural relics display cabinet by means of numerical experiments in a virtual space, so as to obtain a more accurate ventilation rate of the display cabinet.

The utility model discloses an electric control lifting system of a tractor, which belongs to the technical field of tractors and comprises a controller and a lifter, the lifter is communicated with an oil tank through an oil pump and comprises an electromagnetic directional valve and a lifting oil cylinder which are communicated with the oil pump through pipelines, and a detection unit used for detecting the lifting height of a piston rod is arranged in the lifting oil cylinder. The detection unit is electrically connected with the controller, the sensor is arranged in the lifting oil cylinder and is not interfered by the outside, the ascending and descending heights of the lifter can be accurately and safely measured, the consequences of insensitivity, failure and the like of a transmission mechanism are avoided, and an agricultural implement can accurately and quickly ascend and descend.

According to the weight measuring system and method for the horizontal rotary kiln, a measuring wheel belt is arranged on the periphery of a rotary kiln body of the system, and the measuring wheel belt comprises a fixed wheel belt and a floating wheel belt; the fixed wheel belt and the floating wheel belt are each provided with a plurality of hydraulic sliding shoes. Supporting foundations are arranged at the lower ends of the hydraulic sliding shoes; the hydraulic sliding shoes are distributed between the lower portion of the fixed wheel belt and the supporting foundation in an arc shape, and the hydraulic sliding shoes are distributed between the lower portion of the floating wheel belt and the supporting foundation in an arc shape. The hydraulic sliding shoes are provided with hydraulic oil subsystems, the hydraulic oil subsystems supply high-pressure hydraulic oil to the running surfaces of the hydraulic sliding shoes, and lubricating oil films are formed between the surfaces of the hydraulic sliding shoes and the fixed wheel belt or the floating wheel belt. A pressure transmitter is installed on a lubricating oil pipeline of each hydraulic sliding shoe, and the gravity of the rotary kiln body is obtained by measuring the force applied to each hydraulic sliding shoe by the rotary kiln body through the pressure transmitters. The method is not influenced by stop or rotation speed of the rotary kiln body, the temperature measurement result is high in accuracy, and the measurement process is safe and reliable.

The invention relates to the technical field of lifting working platform deflection amount measurement, in particular to a lifting working platform deflection amount measuring device and a measuring method thereof.The lifting working platform deflection amount measuring device comprises a linear laser, a terminal, a base, a lifting mast, a working platform, a reflecting lens and a laser receiver; a lifting mast is fixed to the top of the base, and a working platform is fixed to the top of the lifting mast. A reflecting lens is fixed on one side of the lower surface of the working platform, the linear laser and the laser receiver are arranged at the top of the base and located on the same side as the reflecting lens, the linear laser emits laser to the reflecting lens, and the reflecting lens reflects the laser to the laser receiver to achieve deflection measurement; the reflecting lens is provided with a first reflecting surface and a second reflecting surface, and the first reflecting surface and the second reflecting surface are perpendicular to each other; the terminal is connected with the laser receiver for signal interaction, and the deflection amount measuring device and the deflection amount measuring method of the lifting working platform can realize accurate, safe and convenient deflection amount measurement.