61results about How to "Simple and reliable measurement method" patented technology

The invention discloses a measuring device for mounting angles of blades of an axial flow fan. The measuring device comprises a connecting rod, a reference rod and a measuring long rod are respectively perpendicularly mounted at two ends of the connecting rod, the measuring long rod is perpendicular to a plane consisting of the reference rod and the connecting rod, an indicator is perpendicularly fixedly arranged at one end of the measuring long rod, the indicator and the reference rod are perpendicular to each other, a graduated disc is further perpendicularly mounted at one end of the measuring long rod, is abutted to the indicator and can rotate left and right around a mounting point, the bottom edge of the graduated disc is flat, and graduation values are marked on the graduated disc. During usage, the measuring device has the advantages that a measuring mode is visual, simple and reliable, measurement accuracy is improved, and the mounting angles of the blades of the axial flow fan are effectively ensured to meet designed requirements.

The invention discloses a monitoring method for sedimentation of soft soil foundation and the device. Procedures are that firstly, working reference pile is buried; secondly displacement sensor is installed; thirdly cable is connected; fourthly sedimentation steel plate is set; fifthly displacement is monitored and data are read; sixthly data is processed. Cement sand pile is connected with lower-layer PVC pipe and pre-buried steel plate is embedded at the top of pile. Four clip springs are welt on the pre-buried steel plate. The foundation of displacement sensor is fixed on the pre-buried steel plate tightly by clip springs. The foundation is connected with pull rod. The pull rod mated with spring is connected ball head. The ball head is connected with sedimentation steel plate. Shell, foundation, pull rod, spring and ball head are covered by bellows. The sedimentation steel plate is connected with upper-layer PVC pipe and the foundation of sensor is connected with the cable. After the cable passes through the hole and it is connected with digital display instrument through the cable protective pipe. The invention can not be constrained by construction and weather conditions and can realize quick, accurate, continuous and easy measurement for sedimentation value of soft soil foundation. The measuring accuracy is high and foundation sedimentation after opening for traffic can be monitored for a long time.

The invention discloses a measuring device for mounting angles of blades of an axial flow fan. The measuring device comprises a connecting rod, a reference rod and a measuring long rod are respectively perpendicularly mounted at two ends of the connecting rod, the measuring long rod is perpendicular to a plane consisting of the reference rod and the connecting rod, an indicator is perpendicularly fixedly arranged at one end of the measuring long rod, the indicator and the reference rod are perpendicular to each other, a graduated disc is further perpendicularly mounted at one end of the measuring long rod, is abutted to the indicator and can rotate left and right around a mounting point, the bottom edge of the graduated disc is flat, and graduation values are marked on the graduated disc. During usage, the measuring device has the advantages that a measuring mode is visual, simple and reliable, measurement accuracy is improved, and the mounting angles of the blades of the axial flow fan are effectively ensured to meet designed requirements.

The invention discloses a method for monitoring the efficient and safe operation of a belt conveyor in a coal mine working face, comprising the steps of: 1. arranging hardware equipment for monitoring; 2. data collection and transmission; Operational control. The method of the invention has simple steps. The coal flow can be efficiently and accurately detected by detecting the feature point data of the outer contour of the coal flow by using the laser radar, detecting the real-time belt speed of the conveyor belt by using the rotary encoder, and then analyzing, processing and calculating the data on the computer. ;The visual sensor is used to efficiently and accurately detect the outline of the coal on the conveyor belt, so as to realize the accurate and automatic identification of large coal on the working face; the detection efficiency of coal flow is high, the precision is high, the identification method of large coal is simple and reliable, and the error is small. The efficient and safe operation of the belt conveyor is of great significance and is convenient for popularization and use.

The invention discloses a measuring method and device of an annular semi-closed thin-wall part in machining process. The wall thickness measurement of the annular semi-closed region part which is inconvenient to measure is transferred to the outer side of the part, and whether the wall thickness is qualified or not is judged by measuring the surface distance between the extending surface of an inner surface and the extending surface of an outer surface of the wall thickness of the part to be measured. According to the measuring method and the device, the problem that the wall thickness of theannular semi-closed region is not easy to measure in the machining process is solved, so that the wall thickness measuring work can be completed without detaching the part from a clamping clamp. Furthermore, the clamp for clamping the part is used as a foundation, a support surface which is coplanar with the outer surface of the wall thickness of the part to be measured is extended on the clamp toserve as a reference surface, and a comparison surface of a measuring clamping plate which is parallel to the inner surface of the wall thickness of the part to be measured is matched, then the distance between the inner surface and the outer surface can be measured, and therefore the wall thickness can be measured.

The invention discloses a square wave transformation amplitude measuring device based on self-mixing interference. The device comprises a light source unit, a signal processing unit and a data processing unit, wherein the signal processing unit introduces a hysteresis comparator to process signals so as to output required square wave signals, and the data processing unit searches for turning points for the output square wave signals so as to calculate the vibration amplitude of an object according to the number of fringes in the same inclined direction between adjacent turning points. The invention also discloses a square wave transformation amplitude measurement method based on self-mixing interference. According to the invention, the hysteresis comparator circuit with adjustable upper and lower limits is adopted to perform square wave transformation on an obtained laser self-mixing signal, so that the influence of external noise on the measurement stability and accuracy is effectively reduced. The self-mixing interference principle is adopted with no specific requirement on the coherence of the laser light source, so that the laser has large selection freedom. Meanwhile, the amplification factor of the signal is controllable, the measurable minimum amplitude value can reach a nanometer level, and wide-range real-time measurement is easy to realize.