42results about How to "Accurate displacement measurement" patented technology

The invention belongs to bridge construction, and particularly relates to dynamic real-time monitoring method for concrete bridge prestressed tendon tensioning force and a special prestress construction system. The dynamic real-time monitoring method for the concrete bridge prestressed tendon tensioning force includes the steps of initializing and real-time dynamic control loading. The prestress construction system comprises at least one tensioning device, and each tensioning device comprises a hydraulic station, a reversing valve bank, a jack, an A / D data collecting module, a PLC, a central processing unit, a human-computer interface, a direct force measuring device, a hydraulic force measuring device, a prestressed tendon elongation measuring device, a friction resistance test device and a security alarm device. The double-control requirement, difficult to met in the prior art, for taking stress control as the principle thing and an elongation value as a checking item is met, the dynamic real-time monitoring method has the advantages that construction quality and safety can be effectively ensured, and problems found in the tensioning process can be solved in time.

The invention discloses a wide range fiber grating displacement sensor capable of adjusting a measuring range and precision, comprising fiber gratings, a spring and a rectangle housing; the adaptive position on the inner wall of the housing is fixedly connected to a support plate; the middle portion of the free end of the support plate is provided with a groove; the top end of the groove is provided with a sleeve sleeving a rotation shaft; an eccentric point of a gear passes through the middle portion of a rotation shaft and is integrated with the rotation shaft; the lower end of the gear is meshed with a spline fixed on a support rod on the lower part of the housing; one end of the spline is fixedly connected to the measurement rod; the measurement rod passes through and is projected out of the side wall of the adjacent housing and is in contact with a measured structure; the other end of the spline is connected to the side wall of the housing of the other end through a spring which is fixedly connected in parallel; and the two fiber gratings are symmetrically arranged on the upper surface and the lower surface of the support plate. The wide range fiber grating displacement sensor solves the problem that the current fiber grating displacement sensor is small in the measuring range, and is simple in operation, stable in performance, reliable, and high in accuracy and is the first choice for health monitoring of various construction structures.

A resilience and displacement measuring device is disclosed, which is configured with a shaft having a displacement detection module and a force detection module disposed respectively at the two ends thereof. When the shaft is moved for driving a probe of the force detection module to press on a tested press-key, a reflective panel in the displacement detection module will be caused to displace along with the moving of the shaft for allowing a light sensor to measure the displacement of the shaft, and the same time that the pressing of the probe on the press-key will force a detection film to deform for allowing a stain gauge to measure a resilience. The device is capable of dividing a measurement range into a plurality of sub-ranges while designing calculation models specifically for the sub-ranges, by that a precise distance can be obtained from the measured distance information of calculation models.

The present disclosure relates to a macro-micro composite grating ruler measuring system based on conversion and amplification in vertical and horizontal directions. The macro-micro composite grating ruler includes a grating ruler, a macro-micro reading system moving with respect to the grating ruler, and a counting and image processing module. The macro-micro reading system faces grating strip datum and is parallel to the grating ruler. The system further includes a measuring reference line. The measuring reference line obtained by the image sensor together with grating strips forms an image overlap in the counting and image processing module. The measuring reference line and the grating strip jointly include an angle θ. With the foregoing configuration, the present invention is compatible with the existing incremental grating rulers and absolute grating rulers, so is highly applicable.

The invention provides a method for measuring irregular objects on the bag loading platform of cross-belt sorter. The bag loading platform comprises a measuring light curtain, a light curtain controller, and a programmable logic controller (PLC). The measuring light curtain and the light curtain controller are connected through a power cable. The programmable logic controller is connected with the light curtain controller through an RS485 junction manner and communicates under a free port communication protocol. According to the invention, in order to make irregular objects drop completely in the outer edge of a cart, and to reduce the requirements on the positions of the objects by manual placement through the bag loading platform and on the package appearance of the objects onto the bag loading platform, a mathematical modeling process is carried out for the object testing manner with the introduction of analytic geometric operations to develop a mature measuring method for the sizes and positions of irregular objects, which improves the accuracy of loading bags and reduces the wrong packet rate while improving the suitability of the bag loading platform and reducing the labor intensity of the operation men.

There is provided a contact displacement meter in which the size of the housing can be miniaturized as much as possible without lowering the measurement accuracy of a displacement. Light emitted by a light emitting element is converted to parallel light by a lens, and then is deflected to a predetermined direction and converted to wide-width parallel light by a prism. The displacement of a contact attached with one of a plate-shaped scale member and a linear sensor is calculated from a projection position of a reference pattern and the unique information obtained based on a plurality of received light signals of the linear sensor.

The invention belongs to the technical field of robots, and particularly relates to a robot capable of automatically working according to a planned path and a displacement measuring mechanism thereof. The displacement measuring mechanism comprises a meter counter and an elastic connecting assembly. The meter counter comprises a follower wheel rotating along with movement of the robot body. The elastic connecting assembly comprises an elastic connecting piece, wherein the first end of the elastic connecting piece is connected to the robot body, and the follower wheel is rotationally connected to the second end of the elastic connecting piece. The elastic connecting piece elastically stretches out and draws back in the direction perpendicular to the moving direction of the robot body, so that the follower wheel is tightly attached to the working face when rotating along with moving of the robot body. The meter counter is adopted to detect the displacement length of the robot body, the meter counter has every high detection precision, and accurate measurement of the displacement of the robot body can be achieved. Besides, the elastic connecting assembly is arranged to ensure that the follower wheel of the meter counter is always attached to the working face, the robot body moves, the follower wheel rotates synchronously, the synchronism is high, and therefore it can be ensured that detection is complete and errorless.