4results about How to "Maintain measurement accuracy" patented technology

The invention belongs to the field of industrial automatic detection, and particularly relates to a high-precision sensor detection mechanism which comprises a sensor protection shaft, a high-precision distance measuring sensor, a guide shaft sleeve and a transition block. The sensor protection shaft is of a hollow shaft-shaped structure; the high-precision distance measuring sensor is fixedly arranged in an inner cavity of the sensor protection shaft in the axial direction, and a measuring head of the high-precision distance measuring sensor faces the lower end of the sensor protection shaft. The guide shaft sleeve is coaxially arranged at the lower part of the inner cavity of the sensor protection shaft, and the lower end surface of the guide shaft sleeve is flush with or basically flush with the lower end surface of the sensor protection shaft; the transition block is sleeved in the guide shaft sleeve in an axial sliding manner, the lower end face of the transition block extends out of the guide shaft sleeve and the lower end face of the sensor protection shaft, and a preset gap is formed between the upper end face of the transition block and the measuring head. The slidable transition block is used for replacing a sensor measuring head to directly contact with a measured surface, so that pollutants such as oil stain and dust are effectively isolated, and the measuring head is kept clean and the measuring precision is kept.

The invention relates to the field of material mechanical property testing, and provides an in-service material property detection system based on an indentation method, comprising: an excitation module for applying a composite dynamic excitation load to a pressure head when the spherical pressure head is pressed into a to-be-detected material; the signal acquisition module is used for synchronously acquiring a dynamic load signal and a dynamic displacement signal in the pressing-in process of the pressing head; the data processing module is used for calculating an instantaneous phase difference according to the dynamic load signal and the dynamic displacement signal, constructing an evolution curve of the instantaneous phase difference along with the change of the pressure depth, and extracting a first characteristic depth, a second characteristic depth and a phase hardening index from the evolution curve; and the performance resolving module is used for calculating the elastic modulus and the yield strength of the to-be-tested material according to the first characteristic depth, the second characteristic depth, the phase hardening index and the mapping relation model. According to the method, the plastic hardening constitutive relation of the material does not need to be preset, rapid and micro-damage detection of the tensile property of the material can be achieved through single-time micron-order pressing-in, and the method is particularly suitable for field evaluation of in-service equipment.

The utility model provides a high-temperature infrared detection window convenient to use, which belongs to the technical field of infrared detection windows and comprises a positioning ring sleeve and a fixing ring, an adjusting mechanism is arranged on one side of the back of the positioning ring sleeve, and a cleaning mechanism is arranged at one end of the adjusting mechanism. The cleaning mechanism comprises a connecting bolt, a limiting plate, a hook-and-loop fastener, cleaning cloth, a limiting clamping groove, a reset spring, a limiting clamping block and an arc-shaped sleeve. Through the design of the cleaning mechanism and the combination of a connecting bolt, a limiting plate and a limiting clamping groove, it is ensured that cleaning cloth is stably installed and convenient to replace, the fixing process of the cleaning cloth is simplified through use of a hook-and-loop fastener, and even pressure of the cleaning cloth in the cleaning process is ensured through arrangement of a reset spring; the overall stability of the cleaning mechanism is enhanced through the structure of the arc-shaped sleeve and the limiting clamping block, dirt can be effectively removed in the cleaning work of the high-temperature infrared detection window, and the cleanliness and the measurement accuracy of the window are kept.

The utility model relates to the technical field of voltage transformers, in particular to an electromagnetic voltage transformer which comprises a working table, a lifting groove is formed in the surface of the working table, an anti-vibration pad is installed at the top end of the lifting groove, heat dissipation assemblies are arranged on the two sides of a voltage transformer body, limiting blocks are fixedly installed on the periphery of the anti-vibration pad, and the limiting blocks are fixedly connected with the lifting groove. Limiting grooves are formed in the lower portions of the limiting blocks, limiting rods are fixedly installed at the bottom ends of the four limiting grooves, and a plurality of buffer springs are installed in the lifting groove at equal intervals. Micro deformation, caused by vibration or impact, of the internal structure of the mutual inductor can be remarkably reduced mainly through the buffering effect of an anti-vibration pad; when the voltage transformer body is subjected to stress or vibration in the vertical direction, the buffer springs can absorb and disperse the stress, and the direct influence of the stress on the voltage transformer body is reduced.